WO2012033659A1 - ENHANCED BASE STATION AND METHOD FOR COMMUNICATING THROUGH AN ENHANCED DISTRIBUTED ANTENNA SYSTEM (eDAS) - Google Patents
ENHANCED BASE STATION AND METHOD FOR COMMUNICATING THROUGH AN ENHANCED DISTRIBUTED ANTENNA SYSTEM (eDAS) Download PDFInfo
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- WO2012033659A1 WO2012033659A1 PCT/US2011/049496 US2011049496W WO2012033659A1 WO 2012033659 A1 WO2012033659 A1 WO 2012033659A1 US 2011049496 W US2011049496 W US 2011049496W WO 2012033659 A1 WO2012033659 A1 WO 2012033659A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2603—Arrangements for wireless physical layer control
- H04B7/2609—Arrangements for range control, e.g. by using remote antennas
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5691—Access to open networks; Ingress point selection, e.g. ISP selection
- H04L12/5692—Selection among different networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0452—Multi-user MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/24—Multipath
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
- H04L5/0035—Resource allocation in a cooperative multipoint environment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/03—Protecting confidentiality, e.g. by encryption
- H04W12/037—Protecting confidentiality, e.g. by encryption of the control plane, e.g. signalling traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/10—Integrity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/02—Capturing of monitoring data
- H04L43/026—Capturing of monitoring data using flow identification
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/02—Protecting privacy or anonymity, e.g. protecting personally identifiable information [PII]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/15—Setup of multiple wireless link connections
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
Definitions
- Embodiments pertain to wireless communications. Some embodiments relate to base stations that use distributed antenna systems to communicate with user equipment. Some embodiments relate to networks that operate in accordance with 3 GPP LTE Evolved Universal Terrestrial Radio Access Network (E-UTRAN) radio-access technologies (RATs) and evolutions thereof. Some embodiments relate to WiMAX networks that operate in accordance with IEEE 802.16 RATs and evolutions thereof.
- E-UTRAN Evolved Universal Terrestrial Radio Access Network
- RATs radio-access technologies
- WiMAX networks that operate in accordance with IEEE 802.16 RATs and evolutions thereof.
- a conventional distributed-antenna system is a network of spatially separated antennas connected to a common source via a transport medium that provides wireless service within a geographic area (e.g., cell) or a structure (indoor coverage).
- a geographic area e.g., cell
- a structure indoor coverage
- FIG. 1 illustrates an enhanced radio-access network (eRAN) in accordance with some embodiments
- FIG. 2 illustrates an enhanced distributed-antenna system (eDAS) eDAS network architecture in accordance with some embodiments
- FIG. 3A illustrates the partitioning of synchronization codes in accordance with some embodiments
- FIG. 3B illustrates a code structure in accordance with some embodiments
- FIG. 4 illustrates various functional elements of the eRAN of FIG. 1 in accordance with some embodiments
- FIG. 5 illustrates downlink physical layer processing performed at an eDAS base station in accordance with some embodiments
- FIG. 6 illustrates reference signal multiplexing scheme in accordance with some embodiments
- FIG. 7 is an example of an eDAS base station configured for operation along train tracks in accordance with some embodiments.
- FIGs. 8A, 8B and 8C illustrate various antenna node mobility situations in accordance with some embodiments.
- FIG. 1 illustrates an enhanced radio-access network (eRAN) in accordance with some embodiments.
- the eRAN 100 may include one or more enhanced DAS (eDAS) base stations 102, each configured to serve user equipment (UE) 112 within an associated cell 108.
- eDAS base station (102) may utilize an enhanced distributed antenna system
- eDAS comprising a plurality of geographically-separated antenna nodes 104.
- Each of the antenna nodes 104 may have a plurality of spatially separated antenna elements 106.
- At least some of the antenna nodes 104 are not located at the same location as the eDAS base station 102 and are provided at different locations in the cell 108.
- the eRAN 100 may comprise at least two or more eDAS base stations 102 of a paging group that communicate with an access gateway 1 10.
- the eDAS base stations 102 of the paging group may be configured to communicate with the access gateway 1 10 over an SI interface 101.
- the eDAS base stations 102 of the paging group may be configured to communicate directly over an X2+ interface 109.
- Each eDAS base station 102 may operate as a processing center for its associated cell 108 and may be configured to communicate with the antenna nodes 104 over a physical-layer X3 interface 103.
- the eDAS base station 102 may cause the antenna nodes 104 to transmit reference signals in accordance with a multiplexing scheme to allow user equipment 1 12 to perform channel estimation for the antenna elements 106 of any one or more of the antenna node 104.
- the eDAS base station 102 may also cause the antenna nodes 104 to transmit synchronization codes to allow user equipment 1 12 to synchronize with the antenna elements 106 of any one or more of the antenna nodes 104.
- the user equipment 1 12 may uniquely identify the antenna nodes 104 as well as the individual antenna elements 106 of any one of the antenna nodes 104 for both channel estimation and synchronization. As illustrated in FIG. 1, some user equipment 1 12 may be served by the antenna nodes 104 within the same cell 108, while some user equipment 1 12 may be served by the antenna nodes 104 from different cells 108. Each cell 108 may be associated with a geographic area.
- the X3 interface 103 between the eDAS base station 102 and the antenna nodes 104 may be standardized allowing the eDAS base station 102 to fully support and take advantage of the benefits of some advanced communication techniques in current and upcoming wireless standards, such as single-user (SU) and multi-user (MU) multiple-input multiple-output (MIMO) (i.e., SU-MIMO and MU-MIMO) communication techniques.
- SU single-user
- MU multi-user
- MIMO multiple-input multiple-output
- the eDAS base station 102 may be part of a cooperative RAN architecture that provides enhanced features in order to provide significantly improved coverage, performance, and reliability at significantly reduced complexity and power consumption.
- less power may be consumed in overcoming penetration and shadowing losses, since a line-of-sight channel may be present leading to reduced fading depths and reduced delay spread.
- the transmit power of user equipment 1 12 may therefore be reduced resulting in more energy-efficient uplink operation and lower battery consumption.
- each antenna element 106 may be a separate antenna and may be effectively separated from other antenna elements 106 of an antenna node 104 to take advantage of spatial diversity and the different channel characteristics that may result between each of the antenna elements 106 and the one or more antennas of the user equipment.
- antenna elements 106 may be separated by up to 1/10 of a wavelength or more.
- the eDAS base station 102 may be an eDAS enhanced node B (eNB) configured to operate in accordance with one of the 3 GPP LTE E-UTRAN standards (such as LTE release 10).
- the eDAS base station 102 may be a WiMAX base station configured to operate in accordance with one of the IEEE 802.16 standards (such as IEEE 802.16m).
- FIG. 2 illustrates an enhanced distributed-antenna system (eDAS) eDAS network architecture in accordance with some embodiments.
- the eDAS base station 102 may communicate with user equipment 1 12 using two or more antenna nodes 104 (antenna nodes A; and A j ) over the X3 interface 103.
- each antenna node 104 may include a plurality of antenna elements 106 (illustrated as An through A ⁇ for antenna node A; and illustrated as A j i through A jn for antenna node A j ).
- each cell 108 (FIG. 1) may include N antenna nodes 104 each having ; antenna elements 106.
- Antenna node A may be located at distance d; from the eDAS base station 102 and at distance d y from antenna node A j .
- the eDAS base station 102 may have the equivalent of NxN; antenna elements where each group of ; antenna elements are physically separated by a distance that can be geometrically calculated based on d; and di j .
- MIMO schemes may be enabled at each antenna node 104 through the use of NxN;
- each antenna node 104 may be uniquely identified via physical layer identifiers as described in more detail below.
- FIG. 3A illustrates the partitioning of synchronization codes in accordance with some embodiments.
- synchronization codes transmitted by the antenna nodes 104 may allow user equipment 112 (FIG. 1) to synchronize with the antenna elements 106 of any one or more of the antenna nodes (104).
- the synchronization codes may be partitioned to include information fields 300 to uniquely identify a paging group, the eDAS base station 102, and one of the antenna nodes 104.
- the information fields 300 of the synchronization codes may include a paging group ID field 301 that identifies the paging group of two or more eDAS base stations 102.
- the information fields 300 may also include a cell ID field 302 that identifies the eDAS base station 102.
- the information fields 300 may also include an antenna-node ID field 304 that identifies an individual one of the antenna nodes 104 associated with the eDAS base station 102.
- the paging group ID field 301 may be an eNB group ID field
- the cell ID field 302 may be an eNB ID field
- the antenna-node ID field 304 may be an eNB antenna-node ID field.
- the paging group ID field 301 may comprise N3 bits
- the cell ID field 302 may comprise N2 bits
- the antenna-node ID field 304 may comprise i bits where and where N may be a number of antenna nodes 104.
- FIG. 3B illustrates a code structure in accordance with some embodiments.
- the synchronization codes transmitted by the antenna nodes 104 may comprise a unique code structure 310 having a code space that is divided into a plurality of subspaces 315.
- the subspaces 315 may to allow the user equipment 1 12 (FIG. 1) to uniquely identify the paging group, the eDAS base station 102 (FIG. 1) and the particular antenna node 104 (FIG. 1).
- the code structure may comprise a code sequence of 2 N distinct synchronization codes.
- the plurality of subspaces 315 may include a plurality of paging-group subspaces 311 to identify each paging group of the eRAN 100 (FIG. 1).
- Each paging-group subspace 311 may be associated with one paging group and includes a plurality of eNB subspaces 312.
- Each eNB subspace 312 may be associated with one of the eDAS base stations 102 of the paging group and each eNB subspace 312 may have a plurality of antenna-node subspaces 304.
- Each antenna-node subspace 314 may be associated with one antenna node 104 of the eDAS base station 102.
- the set of distinct synchronization codes 310 may comprise a set or a family of 2 N distinct synchronization codes, where N may be the size of the synchronization code sequence.
- the code space of 2 N codes may be partitioned into 2 N /2 N3 subspaces 311, and each of the subspaces 311 may be further divided into 2 N3 /2 N2 subspaces 312.
- Each of subspaces 312 may be further divided into 2 N2 /2 N1 subspaces 314. This sequence partitioning may help with detecting and decoding of the information fields 300 by the user equipment 1 12.
- the example partitioning and code structure illustrated in FIGs. 3A and 3B allow for an eDAS base station 102 to provide mobility management within a cell 108 by handing over the user equipment 1 12 from one antenna node 104 or group of antenna nodes 104 to another group.
- the user equipment 112 can measure and report received signal strength from each antenna node based on the reference signals 601.
- the eDAS base station 102 may then redirect the signals from another antenna node 104 or group of antenna nodes 104 that are geographically closer to the user equipment 1 12.
- the intra-cell handover and mobility management between antenna nodes 104 may be performed by redirecting the transmissions over the X3 interface 103 from an initial antenna node 104 to target antenna node 104 since the baseband processing is performed within in the eDAS base station 102.
- the mobility management within an eDAS cell 108 may reduce to "data and control path" selection for the user equipment 112 based on the signal quality measurement reports from the user equipment 1 12.
- FIG. 4 illustrates various functional elements of the eRAN of FIG. 1 in accordance with some embodiments.
- the access gateway 110 may include a Mobility Management Entity (MME) 402, a packet data network gateway (P-GW) 404, and a serving gateway (S-GW) 406 for performing conventional gateway functions including providing access to an IP network.
- MME Mobility Management Entity
- P-GW packet data network gateway
- S-GW serving gateway
- the access gateway 1 10 may be configured in accordance with the LTE evolved packet core (EPC) specification to provide Multi- megabit bandwidth capability, latency reduction and improved mobility.
- EPC LTE evolved packet core
- the eDAS base stations 102 may communicate with the access gateway 1 10 over a core-network interface (e.g., SI interface 101).
- SI interface 101 e.g., SI interface 101
- the eDAS base station 102 may utilize a software-defined radio (SDR) baseband processing pool comprising a plurality of processors configured to perform the various operations described herein.
- SDR software-defined radio
- Each eDAS base station 102 may operate as a processing center for its associated cell 108 and may be configured to communicate with the antenna nodes 104 over the physical-layer X3 interface 103.
- the X3 interface 103 may comprise at least one of optical fiber links and coaxial links coupling each antenna node 104 to the baseband processing pool.
- the X3 interface 103 may couple RF front ends of each antenna node 104 to an RF front end of the eDAS base station 102.
- the X3 interface may be configured to communicate RF signals between the antenna elements 106 of each antenna 104 and the eDAS base station 102.
- the X3 interface is configured to communicate baseband signals between the antenna elements 106 of each antenna 104 and the eDAS base station 102.
- Baseband processing may be performed at the centralized processing location of the eDAS base station 102.
- the X3 interface may comprise any broad-bandwidth connection that operates at either an RF or baseband level.
- the eDAS base station 102 may be configured to perform mobility management between antenna nodes 104 for the user equipment 1 12, and perform soft and hard handovers between antenna nodes 104 of the same cell 108 for the user equipment 1 12 using cooperative communications over the X3 interface.
- the eDAS base station 102 may be further configured to perform handovers between antenna nodes 104 of different cells.
- the eDAS base stations 102, the access gateway 1 10, and the antenna nodes 104 are illustrated as having several separate functional elements, one or more of the functional elements may be combined and may be implemented by combinations of software-configured elements, such as processing elements including digital signal processors (DSPs), and/or other hardware elements.
- DSPs digital signal processors
- some elements may comprise one or more microprocessors, DSPs, application specific integrated circuits (ASICs), radio-frequency integrated circuits (RFICs) and combinations of various hardware and logic circuitry for performing at least the functions described herein.
- the functional elements of the eDAS base stations 102, the access gateway 1 10, and the antenna nodes 104 may refer to one or more processes operating on one or more processing elements.
- Embodiments may be implemented in one or a combination of hardware, firmware and software. Embodiments may also be implemented as instructions stored on a computer-readable storage device, which may be read and executed by at least one processor to perform the operations described herein.
- a computer-readable storage device may include any non-transitory mechanism for storing information in a form readable by a machine (e.g., a computer).
- a computer-readable storage device may include read-only memory (ROM), random-access memory (RAM), magnetic disk storage media, optical storage media, flash-memory devices, and other storage devices and media.
- an eDAS base station 102 may include one or more processors and may be configured with instructions stored on a computer-readable storage device.
- FIG. 5 illustrates downlink physical layer (PHY-layer) processing performed at an eDAS base station in accordance with some embodiments.
- an eDAS base station 102 may operate as a processing center for its associated cell 108 (FIG. 1) and may be configured to communicate with the antenna nodes 104 (FIG. 1) over the X3 interface 103 (FIG. 1).
- each eDAS base station 102 may perform separate physical layer processing for each antenna node 104 and transmit physical-layer signals over the X3 interface 103 to the antenna nodes 104.
- each eDAS base station 102 may perform per-antenna node modulation and coding adaptation 502.
- Each eDAS base station 102 may also perform per antenna node MIMO processing 504, and per antenna node antenna and resource mapping 506. These physical- layer processing operations may generate physical-layer signals 508 for transmission over the X3 interface 103 to the antenna nodes 104.
- physical-layer signals 508A may be transmitted to a first antenna node 104 over the X3 interface 103, and physical-layer signals 508B may be transmitted to a second antenna node 104 over the X3 interface 103.
- FIG. 5 illustrates that the physical-layer signals 508 are OFDM signals, this is not a requirement.
- the baseband processing is performed at the eDAS base station 102 (rather than being performed at the antenna nodes 104). This may allow hardware sharing among the processing blocks used for the antenna nodes 104 served by the same eDAS base station 102.
- FIG. 5 may imply the multiplication of physical processing by the number of the antenna nodes 104 served by the eDAS base station 102, the same transmission chain may actually be shared or reused by
- transmission format and modulation and coding schemes may be adapted per antenna node allowing for link-level adaptation of the transmission parameters according to the channel conditions between the user equipment 112 and each antenna node 104.
- MIMO modes and encoding schemes as well as layer mapping and resource mapping may be individually adapted per antenna node 104.
- the performance of baseband processing for the antenna nodes 104 at the eDAS base station 102 allows the eDAS base station 102 to perform intra-eDAS base station 102 coordinated transmissions from multiple antenna nodes 104 corresponding to the same eDAS base station 102 by jointly adjusting the MIMO encoding parameters for the antenna nodes 104 involved in coordinated transmission.
- the eDAS base station 102 is configured to communicate multi-stream transmissions in accordance with SU-MIMO and MU-MIMO
- multi-stream processing as well as SU- MIMO and MU-MIMO processing may be performed at the eDAS base station 102 and the signals may be transmitted over the X3 interface 103 to the selected antenna node 104.
- two or more antenna nodes 104 may be used for SU-MIMO and MU-MIMO transmissions.
- signal-quality reports, channel state information (CSI) or precoding matrix index (PMI) received from the user equipment 1 12 may be used by the eDAS base station 102 as part of a closed-loop MIMO communication technique.
- open-loop MIMO communication techniques may also be utilized.
- FIG. 5 illustrates the physical-layer processing performed for the transmitter side
- the eDAS base station 102 may also be configured to perform similar per- antenna node physical-layer processing for the receive side. Accordingly, functional receive-side components associated with the antenna nodes 104 of a cell 108 may similarly be shared.
- FIG. 6 illustrates reference signal multiplexing scheme 600 in accordance with some embodiments.
- the DAS base station 102 may be configured to cause the antenna nodes 104 (FIG. 1) to transmit reference signals 601 in accordance with a multiplexing scheme 600 to allow user equipment 112 (FIG. 1) to perform channel estimation with the antenna elements 106 (FIG. 1) of any one or more of the antenna node 104.
- the multiplexing scheme 600 for the transmission of the reference signals 601 may comprise a combination of code-division multiplexing (CDM), time-division multiplexing (TDM) and frequency-division multiplexing (FDM) (i.e., a CDM/TDM/FDM scheme) to allow the user equipment 1 12 to uniquely identify reference signals associated with individual antenna elements 106 of any one or more of the antenna nodes 104 for use in channel estimation.
- CDM/TDM/FDM scheme code-division multiplexing
- TDM time-division multiplexing
- FDM frequency-division multiplexing
- each of the antenna nodes 104 associated with the eDAS base station 102 may be configured to transmit with a different CDM code 602.
- the antenna elements 106 of a same antenna node 104 are configured to transmit their reference signals utilizing a common CDM code 602.
- the antenna elements 106 of the same antenna node 104 may further be configured to transmit the reference signals 601 at different times 604 within an orthogonal-frequency division multiplexed (OFDM) symbol and on different subcarrier frequencies 606 of an OFDM resource block 606 as shown in FIG. 6.
- OFDM orthogonal-frequency division multiplexed
- each of the antenna nodes 104 may transmit the reference signals 601 at the same times 604 and on the same subcarrier frequencies 606.
- the use of reference signals 601 that are code, time, and frequency division multiplexed provides for the unique identification of each of the antenna elements 106 associated with any particular antenna node 104.
- the user equipment 112 may be able to estimate the channel to and from each antenna element 106 using these reference signals 601.
- the reference signals 601 may be common reference signals or may be UE-specific.
- the combination of code, time and frequency division multiplexing may help prevent excessive layer-one overhead and may also help prevent the potential loss of code orthogonality during high mobility conditions or due to due to the frequency selectivity of the channel.
- the use of FDM/TDM reference signals without CDM may result in excessive layer-one overhead and degradation of the overall performance of the system.
- the use of CDM reference signals without FDM or TDM may result in a potential loss of code orthogonality during high mobility conditions or due to due to frequency selectivity of the channel.
- antenna elements 106 of an antenna node 104 may be identified by the unique reference signals 601 that are transmitted from that antenna element.
- the reference signals 601 may be time-division and/or frequency-division multiplexed with data sub-carriers within the resource block 606.
- the reference signals 601 may be time-division and/or frequency-division multiplexed with data sub-carriers within the resource block 606 over either a sub-band or the entire frequency band depending on whether the reference signal is UE-specific or a common reference signal (i.e., a common narrowband reference signal or a common wideband reference signal).
- the user equipment 1 12 can distinguish between the reference signals transmitted from each antenna element 106 as well as from each antenna node 104, the user equipment 112 may be able to perform MIMO channel estimation for improved SU-MIMO or MU-MIMO communications, among other things.
- the eDAS base station 102 may receive signal-quality reports from the user equipment 112 that uniquely identify one of the antennas nodes 104 and include signal-quality information of signals received by the user equipment 1 12 from the antenna node 104.
- the user equipment 112 may transmit a signal- quality report to the eDAS base station 102 for each antenna node 104 that it receives signals from for use by the eDAS base station 102.
- the eDAS base station 102 may accordingly direct signals to the appropriate antenna node 104 over the X3 interface 103.
- the user equipment 112 may be able to perform channel estimation for one or more of the antenna elements 106 of an antenna node 104 based on the reference signals 601 transmitted in accordance with the multiplexing scheme 600.
- the signal-quality reports may be based on the channel estimation.
- the signal-quality reports may include an indication of at least one of received signal strength indicator (RSSI), a reference signal received power (RSRP) in some 3GPP LTE embodiments, a carrier to interference-plus-noise ratio (CINR), or other signal quality parameter or path-loss measurement associated with the reference signals received from an indicated antenna node 104.
- the user equipment 1 12 may be configured to select an antenna node 104 among two or more of the antenna nodes 104 based on the signal-quality information of the reference signals transmitted by the antenna nodes 104.
- the eDAS base station 102 may communicate with user equipment 1 12 using one or more antenna nodes 104 that may be closest to the user equipment 112 (e.g., have the best signal characteristics) allowing the user equipment 1 12 to communicate with reduced transmission power levels which may reduce the power consumption of the user equipment 112. Furthermore, signal quality and throughput may be improved.
- the signal-quality reports transmitted by the user equipment 1 12 may identify the paging group ID, the cell ID, as well as the antenna node ID identifying the particular antenna node 104 from which reference signals were received.
- the signal-quality reports may provide signal-quality information associated with signals received by user equipment 1 12 from a particular antenna node 104. Accordingly, each signal-quality report may be associated with a particular antenna node 104.
- FIG. 7 is an example of an eDAS base station configured for operation along train tracks in accordance with some embodiments.
- the eDAS base station 702 may communicate with antenna nodes 704 over an X3 interface to provide communication services within a cell.
- Antenna nodes 704 may be positioned along train tracks 708.
- the antenna nodes 704 may be spatially separated and provided at different geographic locations with the cell (i.e., along the train tracks 708).
- the eDAS base station 702 may be configured to perform physical-layer baseband processing for each of the antenna nodes 704 at a centralized processing location.
- the eDAS base station 702 may also be configured to perform an intra-cell handover between the antenna nodes 704 by redirecting physical-layer signals over the X3 interface from one antenna node 104 to a next antenna node 104, for example, as a train moves along the tracks 708.
- the eDAS base station 702 may be configured to be similar to eDAS base stations 102 (FIG. 1).
- FIGs. 8A, 8B and 8C illustrate various antenna node mobility situations in accordance with some embodiments.
- single antenna node intra-eNB mobility is illustrated.
- multi-antenna node intra-eNB mobility is illustrated.
- geographically-separated antenna nodes 804 are provided at different geographic locations served by the eDAS eNB 802.
- the eDAS eNB 802 is configured to perform physical-layer baseband processing for each of the antenna nodes 804 at a centralized processing location, and perform an intra-cell handovers between the antenna nodes 804 by redirecting physical-layer signals over the X3 interface from an initial antenna node 804 to a target antenna node 804.
- multi-antenna node inter-eNB mobility is illustrated.
- an inter-eNB handover is performed between two eDAS eNBs 802 of a RAN.
- the handover may be coordinated directly between the two DAS eNBs 802 over an X2+ interface, such as the X2+ interface 109 (FIG. 4)
Abstract
Embodiments of an enhanced base station and method for communicating through an enhanced distributed antenna system (eDAS) are generally described herein. The eDAS includes geographically-separated antenna nodes and each of the antenna nodes has a plurality of antenna elements. The base station may perform physical-layer baseband processing for each of the antenna nodes at a centralized processing location, and may cause the antenna nodes to transmit reference signals in accordance with a multiplexing scheme to allow user equipment to perform channel estimation for the antenna elements of any one or more of the antenna nodes. The base station may also cause the antenna nodes to transmit signals having synchronization codes to allow the user equipment to synchronize with the antenna elements of any one or more of the antenna nodes. In some embodiments, the base station may communicate with the antenna nodes over a physical-layer interface.
Description
ENHANCED BASE STATION AND METHOD FOR COMMUNICATING
THROUGH AN ENHANCED DISTRIBUTED ANTENNA SYSTEM ieDAS)
TECHNICAL FIELD
Embodiments pertain to wireless communications. Some embodiments relate to base stations that use distributed antenna systems to communicate with user equipment. Some embodiments relate to networks that operate in accordance with 3 GPP LTE Evolved Universal Terrestrial Radio Access Network (E-UTRAN) radio-access technologies (RATs) and evolutions thereof. Some embodiments relate to WiMAX networks that operate in accordance with IEEE 802.16 RATs and evolutions thereof.
BACKGROUND
A conventional distributed-antenna system is a network of spatially separated antennas connected to a common source via a transport medium that provides wireless service within a geographic area (e.g., cell) or a structure (indoor coverage). One issue with the use of a conventional distributed-antenna system in cellular communication systems is that interface between the base station and the antennas is not standardized making it difficult for a conventional distributed-antenna system to fully support and take advantage of the benefits of some advanced communication techniques in current and upcoming wireless standards.
Thus, there are general needs for enhanced distributed-antenna systems and methods for communicating that can more fully support and more fully take advantage of some of the advanced communication techniques in current and upcoming wireless standards.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates an enhanced radio-access network (eRAN) in accordance with some embodiments;
FIG. 2 illustrates an enhanced distributed-antenna system (eDAS) eDAS network architecture in accordance with some embodiments;
FIG. 3A illustrates the partitioning of synchronization codes in accordance with some embodiments;
FIG. 3B illustrates a code structure in accordance with some embodiments;
FIG. 4 illustrates various functional elements of the eRAN of FIG. 1 in accordance
with some embodiments;
FIG. 5 illustrates downlink physical layer processing performed at an eDAS base station in accordance with some embodiments;
FIG. 6 illustrates reference signal multiplexing scheme in accordance with some embodiments;
FIG. 7 is an example of an eDAS base station configured for operation along train tracks in accordance with some embodiments; and
FIGs. 8A, 8B and 8C illustrate various antenna node mobility situations in accordance with some embodiments.
DETAILED DESCRIPTION
The following description and the drawings sufficiently illustrate specific embodiments to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. Portions and features of some embodiments may be included in, or substituted for, those of other embodiments. Embodiments set forth in the claims encompass all available equivalents of those claims.
FIG. 1 illustrates an enhanced radio-access network (eRAN) in accordance with some embodiments. The eRAN 100 may include one or more enhanced DAS (eDAS) base stations 102, each configured to serve user equipment (UE) 112 within an associated cell 108. Each eDAS base station (102) may utilize an enhanced distributed antenna system
(eDAS) comprising a plurality of geographically-separated antenna nodes 104. Each of the antenna nodes 104 may have a plurality of spatially separated antenna elements 106. At least some of the antenna nodes 104 are not located at the same location as the eDAS base station 102 and are provided at different locations in the cell 108.
In some embodiments, the eRAN 100 may comprise at least two or more eDAS base stations 102 of a paging group that communicate with an access gateway 1 10. The eDAS base stations 102 of the paging group may be configured to communicate with the access gateway 1 10 over an SI interface 101. The eDAS base stations 102 of the paging group may be configured to communicate directly over an X2+ interface 109. Each eDAS base station 102 may operate as a processing center for its associated cell 108 and may be configured to communicate with the antenna nodes 104 over a physical-layer X3 interface 103.
In accordance with embodiments, the eDAS base station 102 may cause the
antenna nodes 104 to transmit reference signals in accordance with a multiplexing scheme to allow user equipment 1 12 to perform channel estimation for the antenna elements 106 of any one or more of the antenna node 104. The eDAS base station 102 may also cause the antenna nodes 104 to transmit synchronization codes to allow user equipment 1 12 to synchronize with the antenna elements 106 of any one or more of the antenna nodes 104.
Accordingly, the user equipment 1 12 may uniquely identify the antenna nodes 104 as well as the individual antenna elements 106 of any one of the antenna nodes 104 for both channel estimation and synchronization. As illustrated in FIG. 1, some user equipment 1 12 may be served by the antenna nodes 104 within the same cell 108, while some user equipment 1 12 may be served by the antenna nodes 104 from different cells 108. Each cell 108 may be associated with a geographic area.
In accordance with embodiments, the X3 interface 103 between the eDAS base station 102 and the antenna nodes 104 may be standardized allowing the eDAS base station 102 to fully support and take advantage of the benefits of some advanced communication techniques in current and upcoming wireless standards, such as single-user (SU) and multi-user (MU) multiple-input multiple-output (MIMO) (i.e., SU-MIMO and MU-MIMO) communication techniques.
In some embodiments, the eDAS base station 102 may be part of a cooperative RAN architecture that provides enhanced features in order to provide significantly improved coverage, performance, and reliability at significantly reduced complexity and power consumption. In these embodiments, less power may be consumed in overcoming penetration and shadowing losses, since a line-of-sight channel may be present leading to reduced fading depths and reduced delay spread. The transmit power of user equipment 1 12 may therefore be reduced resulting in more energy-efficient uplink operation and lower battery consumption.
In some embodiments, each antenna element 106 may be a separate antenna and may be effectively separated from other antenna elements 106 of an antenna node 104 to take advantage of spatial diversity and the different channel characteristics that may result between each of the antenna elements 106 and the one or more antennas of the user equipment. In some embodiments, antenna elements 106 may be separated by up to 1/10 of a wavelength or more.
In some embodiments, the eDAS base station 102 may be an eDAS enhanced node B (eNB) configured to operate in accordance with one of the 3 GPP LTE E-UTRAN
standards (such as LTE release 10). In other embodiments, the eDAS base station 102 may be a WiMAX base station configured to operate in accordance with one of the IEEE 802.16 standards (such as IEEE 802.16m).
FIG. 2 illustrates an enhanced distributed-antenna system (eDAS) eDAS network architecture in accordance with some embodiments. The eDAS base station 102 may communicate with user equipment 1 12 using two or more antenna nodes 104 (antenna nodes A; and Aj) over the X3 interface 103. As illustrated in FIG. 2, each antenna node 104 may include a plurality of antenna elements 106 (illustrated as An through A^ for antenna node A; and illustrated as Aji through Ajn for antenna node Aj). In accordance with embodiments, each cell 108 (FIG. 1) may include N antenna nodes 104 each having ; antenna elements 106. Antenna node A; may be located at distance d; from the eDAS base station 102 and at distance dy from antenna node Aj. The eDAS base station 102 may have the equivalent of NxN; antenna elements where each group of ; antenna elements are physically separated by a distance that can be geometrically calculated based on d; and dij.
In these embodiments, multi-stream open-loop and closed-loop SU-MIMO/MU-
MIMO schemes may be enabled at each antenna node 104 through the use of NxN;
common reference signals associated with the NxN; logical antenna ports (e.g., one for each antenna element 106. In these embodiments, each antenna node 104 may be uniquely identified via physical layer identifiers as described in more detail below.
FIG. 3A illustrates the partitioning of synchronization codes in accordance with some embodiments. In accordance with embodiments, synchronization codes transmitted by the antenna nodes 104 (FIG. 1) may allow user equipment 112 (FIG. 1) to synchronize with the antenna elements 106 of any one or more of the antenna nodes (104). The synchronization codes may be partitioned to include information fields 300 to uniquely identify a paging group, the eDAS base station 102, and one of the antenna nodes 104. In some embodiments, the information fields 300 of the synchronization codes may include a paging group ID field 301 that identifies the paging group of two or more eDAS base stations 102. The information fields 300 may also include a cell ID field 302 that identifies the eDAS base station 102. The information fields 300 may also include an antenna-node ID field 304 that identifies an individual one of the antenna nodes 104 associated with the eDAS base station 102. In some 3GPP LTE embodiments, the paging group ID field 301 may be an eNB group ID field, the cell ID field 302 may be an eNB ID field, and the antenna-node ID field 304 may be an eNB antenna-node ID field.
In the example illustrated in FIG. 3 A, the paging group ID field 301 may comprise N3 bits, the cell ID field 302 may comprise N2 bits, and the antenna-node ID field 304 may comprise i bits where
and where N may be a number of antenna nodes 104.
FIG. 3B illustrates a code structure in accordance with some embodiments. The synchronization codes transmitted by the antenna nodes 104 (FIG. 1) may comprise a unique code structure 310 having a code space that is divided into a plurality of subspaces 315. The subspaces 315 may to allow the user equipment 1 12 (FIG. 1) to uniquely identify the paging group, the eDAS base station 102 (FIG. 1) and the particular antenna node 104 (FIG. 1). In some embodiments, the code structure may comprise a code sequence of 2N distinct synchronization codes.
The plurality of subspaces 315 may include a plurality of paging-group subspaces 311 to identify each paging group of the eRAN 100 (FIG. 1). Each paging-group subspace 311 may be associated with one paging group and includes a plurality of eNB subspaces 312. Each eNB subspace 312 may be associated with one of the eDAS base stations 102 of the paging group and each eNB subspace 312 may have a plurality of antenna-node subspaces 304. Each antenna-node subspace 314 may be associated with one antenna node 104 of the eDAS base station 102.
In some embodiments, the set of distinct synchronization codes 310 may comprise a set or a family of 2N distinct synchronization codes, where N may be the size of the synchronization code sequence. In the example illustrated in FIG. 3B, the code space of 2N codes may be partitioned into 2N/2N3 subspaces 311, and each of the subspaces 311 may be further divided into 2N3/2N2 subspaces 312. Each of subspaces 312 may be further divided into 2N2/2N1 subspaces 314. This sequence partitioning may help with detecting and decoding of the information fields 300 by the user equipment 1 12.
The example partitioning and code structure illustrated in FIGs. 3A and 3B allow for an eDAS base station 102 to provide mobility management within a cell 108 by handing over the user equipment 1 12 from one antenna node 104 or group of antenna nodes 104 to another group. The user equipment 112 can measure and report received signal strength from each antenna node based on the reference signals 601. The eDAS base station 102 may then redirect the signals from another antenna node 104 or group of antenna nodes 104 that are geographically closer to the user equipment 1 12. Unlike conventional cellular systems, the intra-cell handover and mobility management between
antenna nodes 104 may be performed by redirecting the transmissions over the X3 interface 103 from an initial antenna node 104 to target antenna node 104 since the baseband processing is performed within in the eDAS base station 102. Thus the mobility management within an eDAS cell 108 may reduce to "data and control path" selection for the user equipment 112 based on the signal quality measurement reports from the user equipment 1 12.
FIG. 4 illustrates various functional elements of the eRAN of FIG. 1 in accordance with some embodiments. The access gateway 110 may include a Mobility Management Entity (MME) 402, a packet data network gateway (P-GW) 404, and a serving gateway (S-GW) 406 for performing conventional gateway functions including providing access to an IP network. In some embodiments, the access gateway 1 10 may be configured in accordance with the LTE evolved packet core (EPC) specification to provide Multi- megabit bandwidth capability, latency reduction and improved mobility. The eDAS base stations 102 may communicate with the access gateway 1 10 over a core-network interface (e.g., SI interface 101).
In some embodiments, the eDAS base station 102 may utilize a software-defined radio (SDR) baseband processing pool comprising a plurality of processors configured to perform the various operations described herein. Each eDAS base station 102 may operate as a processing center for its associated cell 108 and may be configured to communicate with the antenna nodes 104 over the physical-layer X3 interface 103.
The X3 interface 103 may comprise at least one of optical fiber links and coaxial links coupling each antenna node 104 to the baseband processing pool. In some embodiments, the X3 interface 103 may couple RF front ends of each antenna node 104 to an RF front end of the eDAS base station 102. In these embodiments, the X3 interface may be configured to communicate RF signals between the antenna elements 106 of each antenna 104 and the eDAS base station 102. In some alternate embodiments, the X3 interface is configured to communicate baseband signals between the antenna elements 106 of each antenna 104 and the eDAS base station 102. Baseband processing, however, may be performed at the centralized processing location of the eDAS base station 102. The X3 interface may comprise any broad-bandwidth connection that operates at either an RF or baseband level.
In some embodiments, the eDAS base station 102 may configured to perform mobility management between antenna nodes 104 for the user equipment 1 12, and
perform soft and hard handovers between antenna nodes 104 of the same cell 108 for the user equipment 1 12 using cooperative communications over the X3 interface. In coordinated multipoint (CoMP) embodiments, the eDAS base station 102 may be further configured to perform handovers between antenna nodes 104 of different cells.
Although the eDAS base stations 102, the access gateway 1 10, and the antenna nodes 104 are illustrated as having several separate functional elements, one or more of the functional elements may be combined and may be implemented by combinations of software-configured elements, such as processing elements including digital signal processors (DSPs), and/or other hardware elements. For example, some elements may comprise one or more microprocessors, DSPs, application specific integrated circuits (ASICs), radio-frequency integrated circuits (RFICs) and combinations of various hardware and logic circuitry for performing at least the functions described herein. In some embodiments, the functional elements of the eDAS base stations 102, the access gateway 1 10, and the antenna nodes 104 may refer to one or more processes operating on one or more processing elements.
Embodiments may be implemented in one or a combination of hardware, firmware and software. Embodiments may also be implemented as instructions stored on a computer-readable storage device, which may be read and executed by at least one processor to perform the operations described herein. A computer-readable storage device may include any non-transitory mechanism for storing information in a form readable by a machine (e.g., a computer). For example, a computer-readable storage device may include read-only memory (ROM), random-access memory (RAM), magnetic disk storage media, optical storage media, flash-memory devices, and other storage devices and media. In some embodiments, an eDAS base station 102 may include one or more processors and may be configured with instructions stored on a computer-readable storage device.
FIG. 5 illustrates downlink physical layer (PHY-layer) processing performed at an eDAS base station in accordance with some embodiments. As discussed above, an eDAS base station 102 (FIG. 1) may operate as a processing center for its associated cell 108 (FIG. 1) and may be configured to communicate with the antenna nodes 104 (FIG. 1) over the X3 interface 103 (FIG. 1).
In accordance with embodiments, each eDAS base station 102 may perform separate physical layer processing for each antenna node 104 and transmit physical-layer signals over the X3 interface 103 to the antenna nodes 104. In the example illustrated in
FIG. 5, each eDAS base station 102 may perform per-antenna node modulation and coding adaptation 502. Each eDAS base station 102 may also perform per antenna node MIMO processing 504, and per antenna node antenna and resource mapping 506. These physical- layer processing operations may generate physical-layer signals 508 for transmission over the X3 interface 103 to the antenna nodes 104. In the example illustrated, physical-layer signals 508A may be transmitted to a first antenna node 104 over the X3 interface 103, and physical-layer signals 508B may be transmitted to a second antenna node 104 over the X3 interface 103. Although FIG. 5 illustrates that the physical-layer signals 508 are OFDM signals, this is not a requirement.
In accordance with these embodiments, the baseband processing is performed at the eDAS base station 102 (rather than being performed at the antenna nodes 104). This may allow hardware sharing among the processing blocks used for the antenna nodes 104 served by the same eDAS base station 102. Although FIG. 5 may imply the multiplication of physical processing by the number of the antenna nodes 104 served by the eDAS base station 102, the same transmission chain may actually be shared or reused by
reconfiguration of the parameters of the functional blocks. In the example illustrated in FIG. 5, transmission format and modulation and coding schemes may be adapted per antenna node allowing for link-level adaptation of the transmission parameters according to the channel conditions between the user equipment 112 and each antenna node 104. Furthermore, the MIMO modes and encoding schemes as well as layer mapping and resource mapping may be individually adapted per antenna node 104.
The performance of baseband processing for the antenna nodes 104 at the eDAS base station 102 allows the eDAS base station 102 to perform intra-eDAS base station 102 coordinated transmissions from multiple antenna nodes 104 corresponding to the same eDAS base station 102 by jointly adjusting the MIMO encoding parameters for the antenna nodes 104 involved in coordinated transmission.
In some embodiments, the eDAS base station 102 is configured to communicate multi-stream transmissions in accordance with SU-MIMO and MU-MIMO
communication techniques. In these embodiments, multi-stream processing as well as SU- MIMO and MU-MIMO processing may be performed at the eDAS base station 102 and the signals may be transmitted over the X3 interface 103 to the selected antenna node 104. In some embodiments, two or more antenna nodes 104 may be used for SU-MIMO and MU-MIMO transmissions. In some embodiments, signal-quality reports, channel state
information (CSI) or precoding matrix index (PMI) received from the user equipment 1 12 may be used by the eDAS base station 102 as part of a closed-loop MIMO communication technique. In some embodiments, open-loop MIMO communication techniques may also be utilized.
Although FIG. 5 illustrates the physical-layer processing performed for the transmitter side, the eDAS base station 102 may also be configured to perform similar per- antenna node physical-layer processing for the receive side. Accordingly, functional receive-side components associated with the antenna nodes 104 of a cell 108 may similarly be shared.
FIG. 6 illustrates reference signal multiplexing scheme 600 in accordance with some embodiments. In accordance with embodiments, the DAS base station 102 (FIG. 1) may be configured to cause the antenna nodes 104 (FIG. 1) to transmit reference signals 601 in accordance with a multiplexing scheme 600 to allow user equipment 112 (FIG. 1) to perform channel estimation with the antenna elements 106 (FIG. 1) of any one or more of the antenna node 104.
The multiplexing scheme 600 for the transmission of the reference signals 601 may comprise a combination of code-division multiplexing (CDM), time-division multiplexing (TDM) and frequency-division multiplexing (FDM) (i.e., a CDM/TDM/FDM scheme) to allow the user equipment 1 12 to uniquely identify reference signals associated with individual antenna elements 106 of any one or more of the antenna nodes 104 for use in channel estimation.
In some embodiments, each of the antenna nodes 104 associated with the eDAS base station 102 may be configured to transmit with a different CDM code 602. The antenna elements 106 of a same antenna node 104 are configured to transmit their reference signals utilizing a common CDM code 602. The antenna elements 106 of the same antenna node 104 may further be configured to transmit the reference signals 601 at different times 604 within an orthogonal-frequency division multiplexed (OFDM) symbol and on different subcarrier frequencies 606 of an OFDM resource block 606 as shown in FIG. 6.
As further illustrated in FIG. 6, since the reference signals 601 transmitted by each antenna node 104 may be transmitted with a different CDM code, each of the antenna nodes 104 may transmit the reference signals 601 at the same times 604 and on the same subcarrier frequencies 606. In these embodiments, the use of reference signals 601 that are
code, time, and frequency division multiplexed provides for the unique identification of each of the antenna elements 106 associated with any particular antenna node 104.
Furthermore, in order to perform channel estimation for detection and
demodulation purposes, channel state information and channel quality measurements for MIMO mode selection and rank adaptation, the user equipment 112 may be able to estimate the channel to and from each antenna element 106 using these reference signals 601. The reference signals 601 may be common reference signals or may be UE-specific.
In some embodiments, since the number of antenna elements 106 per antenna node 104 as well as the number of antenna nodes 104 of the eDAS base station 102 may be very large (e.g., greater than 1000), the combination of code, time and frequency division multiplexing may help prevent excessive layer-one overhead and may also help prevent the potential loss of code orthogonality during high mobility conditions or due to due to the frequency selectivity of the channel. The use of FDM/TDM reference signals without CDM may result in excessive layer-one overhead and degradation of the overall performance of the system. The use of CDM reference signals without FDM or TDM may result in a potential loss of code orthogonality during high mobility conditions or due to due to frequency selectivity of the channel.
As illustrated in FIG. 6, by assigning each CDM/FDM/TDM code to one antenna element, antenna elements 106 of an antenna node 104 may be identified by the unique reference signals 601 that are transmitted from that antenna element. The reference signals 601 may be time-division and/or frequency-division multiplexed with data sub-carriers within the resource block 606. In some embodiments, the reference signals 601 may be time-division and/or frequency-division multiplexed with data sub-carriers within the resource block 606 over either a sub-band or the entire frequency band depending on whether the reference signal is UE-specific or a common reference signal (i.e., a common narrowband reference signal or a common wideband reference signal).
Accordingly, since the user equipment 1 12 can distinguish between the reference signals transmitted from each antenna element 106 as well as from each antenna node 104, the user equipment 112 may be able to perform MIMO channel estimation for improved SU-MIMO or MU-MIMO communications, among other things.
In accordance with some embodiments, the eDAS base station 102 may receive signal-quality reports from the user equipment 112 that uniquely identify one of the antennas nodes 104 and include signal-quality information of signals received by the user
equipment 1 12 from the antenna node 104. The user equipment 112 may transmit a signal- quality report to the eDAS base station 102 for each antenna node 104 that it receives signals from for use by the eDAS base station 102. The eDAS base station 102 may accordingly direct signals to the appropriate antenna node 104 over the X3 interface 103. In these embodiments, the user equipment 112 may be able to perform channel estimation for one or more of the antenna elements 106 of an antenna node 104 based on the reference signals 601 transmitted in accordance with the multiplexing scheme 600.
The signal-quality reports may be based on the channel estimation. In some embodiments, the signal-quality reports may include an indication of at least one of received signal strength indicator (RSSI), a reference signal received power (RSRP) in some 3GPP LTE embodiments, a carrier to interference-plus-noise ratio (CINR), or other signal quality parameter or path-loss measurement associated with the reference signals received from an indicated antenna node 104. In some embodiments, the user equipment 1 12 may be configured to select an antenna node 104 among two or more of the antenna nodes 104 based on the signal-quality information of the reference signals transmitted by the antenna nodes 104.
Accordingly, since the user equipment 1 12 is configured to uniquely identify an antenna node 104, the eDAS base station 102 may communicate with user equipment 1 12 using one or more antenna nodes 104 that may be closest to the user equipment 112 (e.g., have the best signal characteristics) allowing the user equipment 1 12 to communicate with reduced transmission power levels which may reduce the power consumption of the user equipment 112. Furthermore, signal quality and throughput may be improved.
In some embodiments, the signal-quality reports transmitted by the user equipment 1 12 may identify the paging group ID, the cell ID, as well as the antenna node ID identifying the particular antenna node 104 from which reference signals were received. In these embodiments, the signal-quality reports may provide signal-quality information associated with signals received by user equipment 1 12 from a particular antenna node 104. Accordingly, each signal-quality report may be associated with a particular antenna node 104.
FIG. 7 is an example of an eDAS base station configured for operation along train tracks in accordance with some embodiments. The eDAS base station 702 may communicate with antenna nodes 704 over an X3 interface to provide communication services within a cell. Antenna nodes 704 may be positioned along train tracks 708. In
accordance with embodiments, the antenna nodes 704 may be spatially separated and provided at different geographic locations with the cell (i.e., along the train tracks 708). The eDAS base station 702 may be configured to perform physical-layer baseband processing for each of the antenna nodes 704 at a centralized processing location. The eDAS base station 702 may also be configured to perform an intra-cell handover between the antenna nodes 704 by redirecting physical-layer signals over the X3 interface from one antenna node 104 to a next antenna node 104, for example, as a train moves along the tracks 708. The eDAS base station 702 may be configured to be similar to eDAS base stations 102 (FIG. 1).
FIGs. 8A, 8B and 8C illustrate various antenna node mobility situations in accordance with some embodiments. In FIG. 8A, single antenna node intra-eNB mobility is illustrated. In FIG. 8B, multi-antenna node intra-eNB mobility is illustrated. As illustrated, geographically-separated antenna nodes 804 are provided at different geographic locations served by the eDAS eNB 802. In these embodiments, wherein the eDAS eNB 802 is configured to perform physical-layer baseband processing for each of the antenna nodes 804 at a centralized processing location, and perform an intra-cell handovers between the antenna nodes 804 by redirecting physical-layer signals over the X3 interface from an initial antenna node 804 to a target antenna node 804.
In FIG. 8C, multi-antenna node inter-eNB mobility is illustrated. In these embodiments, an inter-eNB handover is performed between two eDAS eNBs 802 of a RAN. In these embodiments, the handover may be coordinated directly between the two DAS eNBs 802 over an X2+ interface, such as the X2+ interface 109 (FIG. 4)
The Abstract is provided to comply with 37 C.F.R. Section 1.72(b) requiring an abstract that will allow the reader to ascertain the nature and gist of the technical disclosure. It is submitted with the understanding that it will not be used to limit or interpret the scope or meaning of the claims. The following claims are hereby incorporated into the detailed description, with each claim standing on its own as a separate embodiment.
Claims
What is claimed is: 1. A base station configured to:
communicate through an enhanced distributed antenna system (eDAS) comprising a plurality of geographically-separated antenna nodes wherein each of the antenna nodes have a plurality of antenna elements;
perform physical-layer baseband processing for each of the antenna nodes at a centralized processing location;
cause the antenna nodes to transmit reference signals in accordance with a multiplexing scheme to allow user equipment to perform channel estimation for the antenna elements of any one or more of the antenna nodes; and
cause the antenna nodes to transmit signals having synchronization codes to allow the user equipment to synchronize with the antenna elements of any one or more of the antenna nodes.
2. The base station of claim 1 wherein the base station provides communication services for user equipment within a cell and operates as a processing center for the cell wherein the antenna nodes are provided at different geographic locations within the cell,
wherein the base station is configured to communicate with the antenna nodes over a physical-layer X3 interface, and
wherein the base station is configured to transmit the reference signals and the signals having synchronization codes over the X3 interface for subsequent transmission by the antenna nodes.
3. The base station of claim 1 wherein the synchronization codes are partitioned to include information fields to uniquely identify a paging group, the base station, and one of the plurality of antenna nodes, and
wherein the synchronization codes comprise a code structure having a code space that is divided into a plurality of subspaces to allow the user equipment to uniquely identify the paging group, the base station and the antenna node.
4. The base station of claim 3 wherein the information fields of the synchronization codes comprise:
a paging group ID field that identifies the paging group of two or more base stations;
an cell ID field that identifies the base station; and
an antenna-node ID field that identifies an individual one of the antenna nodes associated with the base station.
5. The base station of claim 4 wherein the plurality of subspaces include a plurality of paging-group subspaces to identify each paging group,
wherein each paging-group subspace is associated with one paging group and includes a base-station subspace for each base station, and
wherein each base-station subspace has a plurality of antenna-node subspaces, each antenna-node subspace being associated with one antenna node of the base station.
6. The base station of claim 1 wherein the multiplexing scheme for transmission of the reference signals comprises a combination of code, time and frequency division multiplexing to allow the user equipment to uniquely identify reference signals associated with individual antenna elements of any one or more of the antenna nodes for use in channel estimation.
7. The base station of claim 6 wherein each of the antenna nodes associated with the base station are configured to transmit with a different code,
wherein the antenna elements of a same antenna node are configured to transmit their reference signals utilizing a common code, and
wherein the antenna elements of the same antenna node are further configured to transmit the reference signals at different times within an orthogonal-frequency division multiplexed (OFDM) symbol and on different subcarrier frequencies of an OFDM resource block.
8. The base station of claim 1 further configured to receive signal-quality reports from the user equipment that uniquely identify one of the antennas nodes and include signal quality information of signals received by the user equipment from the antenna node.
9. The base station of claim 8 further configured to perform an intra-cell handover between antenna nodes by redirecting physical-layer signals over a physical-layer X3 interface from an initial antenna node to a target antenna node.
10. The base station of claim 9 wherein the base station is configured to communicate multi-stream transmissions in accordance with at least one of a SU-MIMO and MU-MIMO communication technique.
1 1. An enhanced radio-access network (eRAN) comprising a plurality of base stations, each base station is configured to:
communicate through an enhanced distributed antenna system (eDAS) comprising a plurality of geographically-separated antenna nodes wherein each of the antenna nodes have a plurality of antenna elements;
perform physical-layer baseband processing for the antenna nodes at a centralized processing location; and
perform an intra-cell handover between antenna nodes by redirecting physical- layer signals from an initial antenna node to a target antenna node.
12. The eRAN of claim 1 1 wherein each base station is further configured to: transmit physical-layer signals to the antenna nodes to cause the antenna nodes to transmit reference signals in accordance with a multiplexing scheme to allow user equipment to perform channel estimation for the antenna elements of any one or more of the antenna nodes; and
transmit physical-layer signals to the antenna nodes to cause the antenna nodes to transmit signals having synchronization codes to allow the user equipment to synchronize with the antenna elements of any one or more of the antenna nodes.
13. The eRAN of claim 12 wherein the synchronization codes are partitioned to include information fields to uniquely identify a paging group, the base station, and one of the plurality of antenna nodes, and wherein the synchronization codes comprise a code structure having a code space that is divided into a plurality of subspaces to allow the user equipment to uniquely identify the paging group, the base station and the antenna node.
14. The eRAN of claim of claim 15 wherein the multiplexing scheme for transmission of the reference signals comprises a combination of code, time and frequency division multiplexing to allow the user equipment to uniquely identify reference signals associated with individual antenna elements of any one or more of the antenna nodes for use in channel estimation.
15. The eRAN of claim 1 1 wherein the base station are an eDAS enhanced node-B (eNBs) configured to operate in accordance with one of the 3 GPP LTE E-UTRAN standards such as LTE release 10. 16. The eRAN of claim 1 1 wherein the base stations are WiMAX base stations configured to operate in accordance with one of the IEEE 802.
16 standards.
17. A method for communicating through an enhanced distributed antenna system (eDAS) comprising a plurality of geographically-separated antenna nodes wherein each of the antenna nodes have a plurality of antenna elements, the method comprising:
performing physical-layer baseband processing for each of the antenna nodes at a centralized processing location;
transmitting physical-layer signals to each of the antenna nodes to cause the antenna nodes to transmit reference signals in accordance with a multiplexing scheme to allow user equipment to perform channel estimation for the antenna elements of any one or more of the antenna nodes; and
communicating multi-stream transmissions through the antenna nodes in accordance with at least one of a SU-MIMO and MU-MIMO communication technique
18. The method of claim 17 further comprising transmitting physical-layer signals to each of the antenna nodes to cause the antenna nodes to transmit signals having synchronization codes to allow the user equipment to synchronize with the antenna elements of any one or more of the antenna nodes.
19. The method of claim 18 wherein the synchronization codes are partitioned to include information fields to uniquely identify a paging group, the base station, and one of the plurality of antenna nodes, and
wherein the synchronization codes comprise a code structure having a code space that is divided into a plurality of subspaces to allow the user equipment to uniquely identify the paging group, the base station and the antenna node.
20. The method of claim 17 wherein the multiplexing scheme for transmission of the reference signals comprises a combination of code, time and frequency division multiplexing to allow the user equipment to uniquely identify reference signals associated with individual antenna elements of any one or more of the antenna nodes for use in channel estimation.
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9179321B2 (en) | 2012-08-09 | 2015-11-03 | Axell Wireless Ltd. | Digital capacity centric distributed antenna system |
US9203577B2 (en) | 2010-09-08 | 2015-12-01 | Intel Corporation | Enhanced base station and method for communicating through an enhanced distributed antenna system (eDAS) |
US10396917B2 (en) | 2014-09-23 | 2019-08-27 | Axell Wireless Ltd. | Automatic mapping and handling PIM and other uplink interferences in digital distributed antenna systems |
US11064501B2 (en) | 2014-12-23 | 2021-07-13 | Axell Wireless Ltd. | Harmonizing noise aggregation and noise management in distributed antenna system |
Families Citing this family (138)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10355720B2 (en) * | 2001-04-26 | 2019-07-16 | Genghiscomm Holdings, LLC | Distributed software-defined radio |
EP3401794A1 (en) | 2002-01-08 | 2018-11-14 | Seven Networks, LLC | Connection architecture for a mobile network |
US8438633B1 (en) | 2005-04-21 | 2013-05-07 | Seven Networks, Inc. | Flexible real-time inbox access |
WO2006136660A1 (en) | 2005-06-21 | 2006-12-28 | Seven Networks International Oy | Maintaining an ip connection in a mobile network |
US8873585B2 (en) | 2006-12-19 | 2014-10-28 | Corning Optical Communications Wireless Ltd | Distributed antenna system for MIMO technologies |
US8805425B2 (en) | 2007-06-01 | 2014-08-12 | Seven Networks, Inc. | Integrated messaging |
US9002828B2 (en) | 2007-12-13 | 2015-04-07 | Seven Networks, Inc. | Predictive content delivery |
US8862657B2 (en) | 2008-01-25 | 2014-10-14 | Seven Networks, Inc. | Policy based content service |
US20090193338A1 (en) | 2008-01-28 | 2009-07-30 | Trevor Fiatal | Reducing network and battery consumption during content delivery and playback |
US8787947B2 (en) | 2008-06-18 | 2014-07-22 | Seven Networks, Inc. | Application discovery on mobile devices |
US8909759B2 (en) | 2008-10-10 | 2014-12-09 | Seven Networks, Inc. | Bandwidth measurement |
KR101624148B1 (en) | 2009-12-30 | 2016-06-07 | 삼성전자주식회사 | Method and appratus for sending and receiving channel state information in network multiple-input mutiple-output wireless communication systems |
US9769016B2 (en) | 2010-06-07 | 2017-09-19 | Brocade Communications Systems, Inc. | Advanced link tracking for virtual cluster switching |
US8867552B2 (en) | 2010-05-03 | 2014-10-21 | Brocade Communications Systems, Inc. | Virtual cluster switching |
US9270486B2 (en) | 2010-06-07 | 2016-02-23 | Brocade Communications Systems, Inc. | Name services for virtual cluster switching |
US9716672B2 (en) | 2010-05-28 | 2017-07-25 | Brocade Communications Systems, Inc. | Distributed configuration management for virtual cluster switching |
US9806906B2 (en) | 2010-06-08 | 2017-10-31 | Brocade Communications Systems, Inc. | Flooding packets on a per-virtual-network basis |
US9807031B2 (en) | 2010-07-16 | 2017-10-31 | Brocade Communications Systems, Inc. | System and method for network configuration |
US8838783B2 (en) | 2010-07-26 | 2014-09-16 | Seven Networks, Inc. | Distributed caching for resource and mobile network traffic management |
US9043433B2 (en) | 2010-07-26 | 2015-05-26 | Seven Networks, Inc. | Mobile network traffic coordination across multiple applications |
KR101804843B1 (en) * | 2010-10-06 | 2017-12-05 | 삼성전자주식회사 | Method and system for assigning addresses to subscriber stations in a wireless communication environment |
US8843153B2 (en) | 2010-11-01 | 2014-09-23 | Seven Networks, Inc. | Mobile traffic categorization and policy for network use optimization while preserving user experience |
WO2012060995A2 (en) | 2010-11-01 | 2012-05-10 | Michael Luna | Distributed caching in a wireless network of content delivered for a mobile application over a long-held request |
US8484314B2 (en) | 2010-11-01 | 2013-07-09 | Seven Networks, Inc. | Distributed caching in a wireless network of content delivered for a mobile application over a long-held request |
GB2500327B (en) | 2010-11-22 | 2019-11-06 | Seven Networks Llc | Optimization of resource polling intervals to satisfy mobile device requests |
GB2495463B (en) * | 2010-11-22 | 2013-10-09 | Seven Networks Inc | Aligning data transfer to optimize connections established for transmission over a wireless network |
WO2012083539A1 (en) * | 2010-12-22 | 2012-06-28 | Nokia Siemens Networks Oy | Allocation of resources |
GB2501416B (en) | 2011-01-07 | 2018-03-21 | Seven Networks Llc | System and method for reduction of mobile network traffic used for domain name system (DNS) queries |
US9008033B2 (en) | 2011-05-20 | 2015-04-14 | Apple Inc. | Apparatus and methods for network assisted hybrid network operation |
US9544108B2 (en) | 2011-02-11 | 2017-01-10 | Qualcomm Incorporated | Method and apparatus for enabling channel and interference estimations in macro/RRH system |
US9426703B2 (en) | 2011-02-11 | 2016-08-23 | Qualcomm Incorporated | Cooperation and operation of macro node and remote radio head deployments in heterogeneous networks |
US8995400B2 (en) | 2011-02-11 | 2015-03-31 | Qualcomm Incorporated | Method and apparatus for enabling channel and interference estimations in macro/RRH system |
US20120208541A1 (en) * | 2011-02-14 | 2012-08-16 | Qualcomm Incorporated | Mobility procedures in wireless networks with distributed remote radio heads |
US9054842B2 (en) | 2011-02-14 | 2015-06-09 | Qualcomm Incorporated | CRS (common reference signal) and CSI-RS (channel state information reference signal) transmission for remote radio heads (RRHs) |
WO2012145533A2 (en) | 2011-04-19 | 2012-10-26 | Seven Networks, Inc. | Shared resource and virtual resource management in a networked environment |
GB2504037B (en) | 2011-04-27 | 2014-12-24 | Seven Networks Inc | Mobile device which offloads requests made by a mobile application to a remote entity for conservation of mobile device and network resources |
WO2012149434A2 (en) | 2011-04-27 | 2012-11-01 | Seven Networks, Inc. | Detecting and preserving state for satisfying application requests in a distributed proxy and cache system |
EP2705615B1 (en) * | 2011-05-02 | 2017-03-01 | LG Electronics Inc. | Method and apparatus for performing ranging at m2m device in a wireless communication system |
US8776221B2 (en) * | 2011-05-11 | 2014-07-08 | Cisco Technology, Inc. | Distinguishing between voice traffic and data links |
KR20150046396A (en) * | 2011-05-20 | 2015-04-29 | 애플 인크. | Apparatus and methods for optimizing scheduled operations in hybrid network environments |
US20140126373A1 (en) * | 2011-06-16 | 2014-05-08 | Nokia Siemens Networks Oy | Dynamic traffic offloading |
JP5357216B2 (en) * | 2011-06-30 | 2013-12-04 | 株式会社日立製作所 | Wireless communication system and method, base station apparatus, terminal apparatus |
US9699456B2 (en) | 2011-07-20 | 2017-07-04 | Qualcomm Incorporated | Buffering prediction data in video coding |
WO2013015994A1 (en) | 2011-07-27 | 2013-01-31 | Seven Networks, Inc. | Monitoring mobile application activities for malicious traffic on a mobile device |
US9736085B2 (en) | 2011-08-29 | 2017-08-15 | Brocade Communications Systems, Inc. | End-to end lossless Ethernet in Ethernet fabric |
US9516524B2 (en) * | 2011-10-25 | 2016-12-06 | Mediatek, Inc. | Transmitter assisted quality of service measurement |
US9450870B2 (en) | 2011-11-10 | 2016-09-20 | Brocade Communications Systems, Inc. | System and method for flow management in software-defined networks |
US8934414B2 (en) | 2011-12-06 | 2015-01-13 | Seven Networks, Inc. | Cellular or WiFi mobile traffic optimization based on public or private network destination |
US8868753B2 (en) | 2011-12-06 | 2014-10-21 | Seven Networks, Inc. | System of redundantly clustered machines to provide failover mechanisms for mobile traffic management and network resource conservation |
WO2013086447A1 (en) | 2011-12-07 | 2013-06-13 | Seven Networks, Inc. | Radio-awareness of mobile device for sending server-side control signals using a wireless network optimized transport protocol |
US9009250B2 (en) | 2011-12-07 | 2015-04-14 | Seven Networks, Inc. | Flexible and dynamic integration schemas of a traffic management system with various network operators for network traffic alleviation |
EP2792188B1 (en) | 2011-12-14 | 2019-03-20 | Seven Networks, LLC | Mobile network reporting and usage analytics system and method using aggregation of data in a distributed traffic optimization system |
GB2499306B (en) | 2012-01-05 | 2014-10-22 | Seven Networks Inc | Managing user interaction with an application on a mobile device |
US8995272B2 (en) | 2012-01-26 | 2015-03-31 | Brocade Communication Systems, Inc. | Link aggregation in software-defined networks |
KR102063078B1 (en) * | 2012-02-11 | 2020-01-07 | 엘지전자 주식회사 | Method for receiving downlink data channels in multicell-based wireless communication systems and apparatus for same |
KR20130095908A (en) * | 2012-02-21 | 2013-08-29 | 한국전자통신연구원 | Method and apparatus for selecting wireless access network based on contents characteristic |
US9742693B2 (en) | 2012-02-27 | 2017-08-22 | Brocade Communications Systems, Inc. | Dynamic service insertion in a fabric switch |
US9154416B2 (en) | 2012-03-22 | 2015-10-06 | Brocade Communications Systems, Inc. | Overlay tunnel in a fabric switch |
EP2832012A1 (en) | 2012-03-30 | 2015-02-04 | Corning Optical Communications LLC | Reducing location-dependent interference in distributed antenna systems operating in multiple-input, multiple-output (mimo) configuration, and related components, systems, and methods |
US8812695B2 (en) | 2012-04-09 | 2014-08-19 | Seven Networks, Inc. | Method and system for management of a virtual network connection without heartbeat messages |
US10263899B2 (en) | 2012-04-10 | 2019-04-16 | Seven Networks, Llc | Enhanced customer service for mobile carriers using real-time and historical mobile application and traffic or optimization data associated with mobile devices in a mobile network |
US9374301B2 (en) | 2012-05-18 | 2016-06-21 | Brocade Communications Systems, Inc. | Network feedback in software-defined networks |
US10277464B2 (en) | 2012-05-22 | 2019-04-30 | Arris Enterprises Llc | Client auto-configuration in a multi-switch link aggregation |
JP2013255047A (en) * | 2012-06-06 | 2013-12-19 | Sharp Corp | Transmitter, receiver, transmission method and reception method |
US8838119B2 (en) | 2012-06-26 | 2014-09-16 | Futurewei Technologies, Inc. | Method and system for dynamic cell configuration |
KR20150030661A (en) * | 2012-07-09 | 2015-03-20 | 엘지전자 주식회사 | Method for receiving or transmitting downlink signal in wireless communication system and device therefor |
WO2014011216A1 (en) | 2012-07-13 | 2014-01-16 | Seven Networks, Inc. | Dynamic bandwidth adjustment for browsing or streaming activity in a wireless network based on prediction of user behavior when interacting with mobile applications |
JP6042127B2 (en) * | 2012-07-25 | 2016-12-14 | 株式会社Nttドコモ | Mobile terminal apparatus and base station apparatus |
US10638526B2 (en) * | 2012-09-24 | 2020-04-28 | Qualcomm Incorporated | Transport of control protocol for trusted WLAN (TWAN) offload |
US9161258B2 (en) | 2012-10-24 | 2015-10-13 | Seven Networks, Llc | Optimized and selective management of policy deployment to mobile clients in a congested network to prevent further aggravation of network congestion |
US9401872B2 (en) | 2012-11-16 | 2016-07-26 | Brocade Communications Systems, Inc. | Virtual link aggregations across multiple fabric switches |
TWI467936B (en) | 2012-11-22 | 2015-01-01 | Ind Tech Res Inst | Method and apparatus for interference suppression in radio-over-fiber communication systems |
US20150229372A1 (en) * | 2014-02-07 | 2015-08-13 | Rearden, Llc | Systems and methods for mapping virtual radio instances into physical volumes of coherence in distributed antenna wireless systems |
WO2014085115A1 (en) | 2012-11-29 | 2014-06-05 | Corning Cable Systems Llc | HYBRID INTRA-CELL / INTER-CELL REMOTE UNIT ANTENNA BONDING IN MULTIPLE-INPUT, MULTIPLE-OUTPUT (MIMO) DISTRIBUTED ANTENNA SYSTEMS (DASs) |
US9307493B2 (en) | 2012-12-20 | 2016-04-05 | Seven Networks, Llc | Systems and methods for application management of mobile device radio state promotion and demotion |
US9548926B2 (en) | 2013-01-11 | 2017-01-17 | Brocade Communications Systems, Inc. | Multicast traffic load balancing over virtual link aggregation |
US9413691B2 (en) | 2013-01-11 | 2016-08-09 | Brocade Communications Systems, Inc. | MAC address synchronization in a fabric switch |
TWI492584B (en) * | 2013-01-18 | 2015-07-11 | D Link Corp | The Path Selection Method of Hybrid Complex Heterogeneous Network |
US9241314B2 (en) | 2013-01-23 | 2016-01-19 | Seven Networks, Llc | Mobile device with application or context aware fast dormancy |
US8874761B2 (en) | 2013-01-25 | 2014-10-28 | Seven Networks, Inc. | Signaling optimization in a wireless network for traffic utilizing proprietary and non-proprietary protocols |
US20140219369A1 (en) * | 2013-02-07 | 2014-08-07 | Flextronics Ap, Llc | Power line communications signal aggregation and switch |
US9565099B2 (en) | 2013-03-01 | 2017-02-07 | Brocade Communications Systems, Inc. | Spanning tree in fabric switches |
US8750123B1 (en) | 2013-03-11 | 2014-06-10 | Seven Networks, Inc. | Mobile device equipped with mobile network congestion recognition to make intelligent decisions regarding connecting to an operator network |
US9401818B2 (en) | 2013-03-15 | 2016-07-26 | Brocade Communications Systems, Inc. | Scalable gateways for a fabric switch |
EP2787662B1 (en) * | 2013-04-05 | 2018-02-28 | Telefonaktiebolaget LM Ericsson (publ) | Antenna port detection |
US9699001B2 (en) | 2013-06-10 | 2017-07-04 | Brocade Communications Systems, Inc. | Scalable and segregated network virtualization |
US9065765B2 (en) | 2013-07-22 | 2015-06-23 | Seven Networks, Inc. | Proxy server associated with a mobile carrier for enhancing mobile traffic management in a mobile network |
CN105659657B (en) * | 2013-08-12 | 2019-03-29 | 英特尔公司 | Resource management in multiple radio access networks |
US9806949B2 (en) | 2013-09-06 | 2017-10-31 | Brocade Communications Systems, Inc. | Transparent interconnection of Ethernet fabric switches |
US9912612B2 (en) | 2013-10-28 | 2018-03-06 | Brocade Communications Systems LLC | Extended ethernet fabric switches |
CN104735274A (en) * | 2013-12-18 | 2015-06-24 | 广西大学 | Learning type universal infrared remote control method based on cloud platform and smart phone |
US9548873B2 (en) | 2014-02-10 | 2017-01-17 | Brocade Communications Systems, Inc. | Virtual extensible LAN tunnel keepalives |
EP3780422A1 (en) | 2014-02-21 | 2021-02-17 | CommScope Technologies LLC | Joint optimization of a radio access network and a distributed antenna system |
US10581758B2 (en) | 2014-03-19 | 2020-03-03 | Avago Technologies International Sales Pte. Limited | Distributed hot standby links for vLAG |
US10476698B2 (en) | 2014-03-20 | 2019-11-12 | Avago Technologies International Sales Pte. Limited | Redundent virtual link aggregation group |
US10063473B2 (en) | 2014-04-30 | 2018-08-28 | Brocade Communications Systems LLC | Method and system for facilitating switch virtualization in a network of interconnected switches |
US9800471B2 (en) | 2014-05-13 | 2017-10-24 | Brocade Communications Systems, Inc. | Network extension groups of global VLANs in a fabric switch |
US10616108B2 (en) | 2014-07-29 | 2020-04-07 | Avago Technologies International Sales Pte. Limited | Scalable MAC address virtualization |
US9525472B2 (en) | 2014-07-30 | 2016-12-20 | Corning Incorporated | Reducing location-dependent destructive interference in distributed antenna systems (DASS) operating in multiple-input, multiple-output (MIMO) configuration, and related components, systems, and methods |
US9807007B2 (en) | 2014-08-11 | 2017-10-31 | Brocade Communications Systems, Inc. | Progressive MAC address learning |
EP3007516B1 (en) * | 2014-10-06 | 2017-08-30 | Motorola Mobility LLC | Apparatus and method for internet protocol (IP) flow mobility |
US9699029B2 (en) | 2014-10-10 | 2017-07-04 | Brocade Communications Systems, Inc. | Distributed configuration management in a switch group |
US9729267B2 (en) | 2014-12-11 | 2017-08-08 | Corning Optical Communications Wireless Ltd | Multiplexing two separate optical links with the same wavelength using asymmetric combining and splitting |
US9689976B2 (en) | 2014-12-19 | 2017-06-27 | Xidrone Systems, Inc. | Deterent for unmanned aerial systems |
US10003552B2 (en) | 2015-01-05 | 2018-06-19 | Brocade Communications Systems, Llc. | Distributed bidirectional forwarding detection protocol (D-BFD) for cluster of interconnected switches |
US9942097B2 (en) | 2015-01-05 | 2018-04-10 | Brocade Communications Systems LLC | Power management in a network of interconnected switches |
US9529360B1 (en) | 2015-01-28 | 2016-12-27 | Howard Melamed | System and method for detecting and defeating a drone |
US9847035B1 (en) | 2015-01-28 | 2017-12-19 | Howard Melamed | Methods for radio frequency spectral analysis |
US10038592B2 (en) | 2015-03-17 | 2018-07-31 | Brocade Communications Systems LLC | Identifier assignment to a new switch in a switch group |
US9807005B2 (en) | 2015-03-17 | 2017-10-31 | Brocade Communications Systems, Inc. | Multi-fabric manager |
KR102352679B1 (en) | 2015-03-25 | 2022-01-18 | 삼성전자주식회사 | Device supporting multipath tcp, and method of receiving video data of device by streaming |
KR102320997B1 (en) * | 2015-03-31 | 2021-11-03 | 삼성전자 주식회사 | Method and Device for transmitting and receiving a data between a user equipment and a base station |
US10579406B2 (en) | 2015-04-08 | 2020-03-03 | Avago Technologies International Sales Pte. Limited | Dynamic orchestration of overlay tunnels |
WO2016195205A1 (en) * | 2015-05-29 | 2016-12-08 | 엘지전자 주식회사 | Method and apparatus for transmitting and receiving signal in inter-vehicle communication system |
US10255287B2 (en) * | 2015-07-31 | 2019-04-09 | Hiveio Inc. | Method and apparatus for on-disk deduplication metadata for a deduplication file system |
US10439929B2 (en) | 2015-07-31 | 2019-10-08 | Avago Technologies International Sales Pte. Limited | Graceful recovery of a multicast-enabled switch |
US10171303B2 (en) | 2015-09-16 | 2019-01-01 | Avago Technologies International Sales Pte. Limited | IP-based interconnection of switches with a logical chassis |
US9912614B2 (en) | 2015-12-07 | 2018-03-06 | Brocade Communications Systems LLC | Interconnection of switches based on hierarchical overlay tunneling |
US10499367B2 (en) | 2016-06-13 | 2019-12-03 | Lg Electronics Inc. | Method for performing paging in wireless communication system and device for same |
CN109314633B (en) * | 2016-06-28 | 2022-06-10 | 英特尔公司 | Enhanced fine timing measurement protocol negotiation |
CN106211238A (en) * | 2016-07-11 | 2016-12-07 | 青岛海信移动通信技术股份有限公司 | Data transmission method and device, terminal |
US9912419B1 (en) * | 2016-08-24 | 2018-03-06 | At&T Intellectual Property I, L.P. | Method and apparatus for managing a fault in a distributed antenna system |
US10869285B2 (en) * | 2016-08-31 | 2020-12-15 | Ntt Docomo, Inc. | User terminal and radio communication method |
WO2018064399A1 (en) * | 2016-09-28 | 2018-04-05 | Ntt Docomo, Inc. | Wireless communication method |
US10237090B2 (en) | 2016-10-28 | 2019-03-19 | Avago Technologies International Sales Pte. Limited | Rule-based network identifier mapping |
KR102431635B1 (en) * | 2016-11-04 | 2022-08-12 | 삼성전자 주식회사 | Adaptive retransmission method and apparatus for latency reduction in wirelss cellular communication system |
US11716785B2 (en) * | 2017-03-24 | 2023-08-01 | Convida Wireless, Llc | Terminal devices, infrastructure equipment and methods |
CN110352613A (en) * | 2017-03-29 | 2019-10-18 | 英特尔Ip公司 | The message segmentation sent for more RAT |
CN106937333A (en) * | 2017-04-25 | 2017-07-07 | 上海斐讯数据通信技术有限公司 | Load balancing apparatus, system and method, a kind of WAP between antenna |
WO2019136741A1 (en) | 2018-01-15 | 2019-07-18 | Zte Corporation | Methods and computing device for facilitating multiple access in a wireless communication network |
CN108667809B (en) | 2018-04-13 | 2020-05-19 | 三维通信股份有限公司 | Method for realizing synchronous management of account information of WEB interface of multi-system DAS |
CN109874138B (en) * | 2019-02-20 | 2022-05-13 | 北京智芯微电子科技有限公司 | Channel measuring method |
US11277251B1 (en) | 2019-07-03 | 2022-03-15 | Michael Patrick Millard | Radio frequency spectrum management system and method |
CN110417452B (en) * | 2019-07-19 | 2021-08-24 | 京信通信系统(中国)有限公司 | Co-construction shared 5G digital room distribution system |
KR20220051843A (en) * | 2019-08-16 | 2022-04-26 | 엘지전자 주식회사 | A method for transmitting and receiving a sidelink signal in a wireless communication system |
WO2021034482A1 (en) | 2019-08-16 | 2021-02-25 | Commscope Technologies Llc | Self-optimization of mobile networks using a distributed antenna system |
CN110519839B (en) * | 2019-08-27 | 2021-12-07 | 南京航空航天大学 | Wireless local area network time synchronization method |
CN112887154B (en) * | 2021-02-05 | 2022-02-18 | 广西师范大学 | Two-dimensional variable code repeat OCDMA (optical code division multiple Access) system based on block chain and data processing method |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100177759A1 (en) * | 2009-01-13 | 2010-07-15 | Adc Telecommunications, Inc. | Systems and methods for ip communication over a distributed antenna system transport |
Family Cites Families (61)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5239668A (en) * | 1989-11-06 | 1993-08-24 | Motorola, Inc. | Satellite signalling system |
US5430759A (en) * | 1992-08-20 | 1995-07-04 | Nexus 1994 Limited | Low-power frequency-hopped spread spectrum reverse paging system |
JPH0856376A (en) * | 1994-08-10 | 1996-02-27 | Fujitsu Ltd | Code transmitting method and portable calling device for radio calling system |
BR9812816A (en) * | 1997-09-15 | 2000-08-08 | Adaptive Telecom Inc | Processes for wireless communication, and to efficiently determine a space channel of the mobile unit in a wireless communication system at the base station, and cdma base station |
KR100760804B1 (en) | 1999-12-18 | 2007-09-20 | 주식회사 케이티 | Apparatus and Method of protecting Security for User Information |
US8594690B2 (en) * | 2000-02-05 | 2013-11-26 | Telefonaktiebolaget L M Ericsson (Publ) | Subcell measurement procedures in a distributed antenna system |
WO2010077192A1 (en) * | 2008-12-29 | 2010-07-08 | Telefonaktiebolaget L M Ericsson (Publ) | Subcell measurement procedures in a distributed antenna system |
US20090245516A1 (en) | 2008-02-26 | 2009-10-01 | Pasupuleti Sureshbabu Ravikiran | Method and system for high entropy encryption using an unpredictable seed based on user regisration time |
US8195187B2 (en) * | 2001-06-25 | 2012-06-05 | Airvana Network Solutions, Inc. | Radio network control |
US20030099196A1 (en) * | 2001-11-23 | 2003-05-29 | Benoist Sebire | Radio bearer service for IMS services |
GB2383221A (en) | 2001-12-13 | 2003-06-18 | Sony Uk Ltd | Method of identifying a codeword used as a watermark |
KR20030078453A (en) | 2002-03-29 | 2003-10-08 | 주식회사 엘지이아이 | Method and apparatus for encrypting and decrypting data in wireless lan |
US7068977B1 (en) * | 2002-10-11 | 2006-06-27 | Navini Networks, Inc. | Method and system for interference assessment and reduction in a wireless communication system |
US6940813B2 (en) * | 2003-02-05 | 2005-09-06 | Nokia Corporation | System and method for facilitating end-to-end quality of service in message transmissions employing message queues |
US7318187B2 (en) * | 2003-08-21 | 2008-01-08 | Qualcomm Incorporated | Outer coding methods for broadcast/multicast content and related apparatus |
US8023941B2 (en) | 2003-12-17 | 2011-09-20 | Interdigital Technology Corporation | Method and apparatus for independent and efficient delivery of services to wireless devices capable of supporting multiple radio interfaces and network infrastructure |
US20080045226A1 (en) * | 2004-07-28 | 2008-02-21 | Sheng Liu | Method for Allocating Channel Processing Resources and Centralized Base Stations for Implementing the Same |
IES20040777A2 (en) | 2004-11-22 | 2006-04-19 | Pendula Ltd | Protection of electronic data |
US8045599B2 (en) * | 2005-02-17 | 2011-10-25 | Sony Corporation | Selection of training sequences for multiple-in multiple-out transmissions |
ATE515165T1 (en) * | 2005-04-01 | 2011-07-15 | Panasonic Corp | HAPPY BIT SETTING IN A MOBILE COMMUNICATION SYSTEM |
CN100495942C (en) * | 2005-04-28 | 2009-06-03 | 西门子(中国)有限公司 | Mobile station grouping method for distributive antenna network and its signaling system |
GB2429876B (en) * | 2005-09-06 | 2010-03-03 | King S College London | A method of providing access to packet-switched services in a heterogeneous network environment |
US9225416B2 (en) * | 2005-10-27 | 2015-12-29 | Qualcomm Incorporated | Varied signaling channels for a reverse link in a wireless communication system |
WO2007078663A2 (en) | 2005-12-16 | 2007-07-12 | Interdigital Technology Corporation | Mobility middleware architecture for multiple radio access technology apparatus |
EP2016683A4 (en) * | 2006-04-27 | 2014-07-16 | Texas Instruments Inc | Methods and apparatus to allocate reference signals in wireless communication systems |
US20080013553A1 (en) | 2006-07-12 | 2008-01-17 | Interdigital Technology Corporation | Activation of multiple bearer services in a long term evolution system |
US8396472B2 (en) * | 2006-08-11 | 2013-03-12 | Intellectual Ventures Holding 81 Llc | Providing multiple data streams by different networks for the same content |
KR101521067B1 (en) * | 2006-10-30 | 2015-05-15 | 인터디지탈 테크날러지 코포레이션 | Method and apparatus for encoding and decoding high speed shared control channel data |
KR100842619B1 (en) * | 2006-11-22 | 2008-06-30 | 삼성전자주식회사 | Symbol error rate based power allocation scheme for combined orthogonal space time block codes and beam forming in distributed wireless communication system |
US8059732B2 (en) * | 2006-11-28 | 2011-11-15 | Ntt Docomo, Inc. | Method and apparatus for wideband transmission from multiple non-collocated base stations over wireless radio networks |
US7729278B2 (en) | 2007-02-14 | 2010-06-01 | Tropos Networks, Inc. | Wireless routing based on data packet classifications |
GB2449923B (en) * | 2007-06-09 | 2011-09-28 | King's College London | Inter-working of networks |
CN101351035B (en) * | 2007-07-19 | 2011-11-30 | 中兴通讯股份有限公司 | Up synchronization method and apparatus for TD-SCDMA system |
US8014265B2 (en) * | 2007-08-15 | 2011-09-06 | Qualcomm Incorporated | Eigen-beamforming for wireless communication systems |
CN101388701B (en) * | 2007-09-10 | 2012-11-07 | 大唐移动通信设备有限公司 | Customer data receiving/transmitting method, apparatus and distributed intelligent antenna system |
ES2710441T3 (en) * | 2007-10-01 | 2019-04-25 | Nokia Technologies Oy | Subscriber group measurement notification closed |
KR101018551B1 (en) * | 2007-12-18 | 2011-03-03 | 아주대학교산학협력단 | Mobile terminal and method for seamless service |
US8295778B2 (en) * | 2008-01-11 | 2012-10-23 | Apple Inc. | Channel rank feedback in multiple-input multiple-output communication systems |
CA2757647A1 (en) * | 2008-04-04 | 2009-12-03 | Powerwave Cognition, Inc. | Methods and systems for a mobile, broadband, routable internet |
EP2699052B1 (en) * | 2008-04-07 | 2018-12-05 | Telefonaktiebolaget LM Ericsson (publ) | A method of and a radio transmission system and radio access equipment for cellular wireless radio transmission |
US8363664B2 (en) * | 2008-08-18 | 2013-01-29 | Cisco Technology, Inc. | Combined gateway for network communications |
KR101470501B1 (en) * | 2008-08-20 | 2014-12-08 | 삼성전자주식회사 | Apparatus and method for transmitting data based on quantized channel state information |
US8693442B2 (en) * | 2008-09-22 | 2014-04-08 | Blackberry Limited | Multi-site MIMO cooperation in cellular network |
US8428595B2 (en) * | 2008-09-30 | 2013-04-23 | Telefonaktiebolaget Lm Ericsson (Publ) | Methods and arrangments for dynamically adjusting the rate of sub cell searching in coordinated multiple point transmission/reception, comp, cells |
AR073833A1 (en) * | 2008-10-20 | 2010-12-01 | Interdigital Patent Holdings | METHODS FOR THE ASCENDING CONTROL OF INFORMATION TRANSMISSION TO ADD CARRIER ONA |
US9215036B2 (en) * | 2008-12-16 | 2015-12-15 | Samsung Electronics Co., Ltd. | Methods and apparatus to identify the accessibility of base stations in communication systems |
US9094167B2 (en) * | 2009-02-02 | 2015-07-28 | Samsung Electronics Co., Ltd. | System and method for multi-user and multi-cell MIMO transmissions |
US20110039562A1 (en) * | 2009-02-05 | 2011-02-17 | Qualcomm Incorporated | Session-specific signaling for multiple access networks over a single access network |
US9084150B2 (en) * | 2009-03-20 | 2015-07-14 | Telefonaktiebolaget L M Ericsson (Publ) | Signaling mechanisms for network-relay interface with reduced overhead |
CN102461031B (en) * | 2009-06-12 | 2015-02-04 | Lg电子株式会社 | Method of managing carriers in a broadband wireless access system |
CN101674275B (en) * | 2009-09-22 | 2012-05-30 | 北京邮电大学 | Method for decreasing spending on channel quality information feedback of wide-band mobile communication system |
US20110244877A1 (en) * | 2009-10-08 | 2011-10-06 | Qualcomm Incorporated | Method and apparatus for using channel state information reference signal in wireless communication system |
US8625556B2 (en) * | 2009-12-29 | 2014-01-07 | Acer Incorporated | Signal interference handling method and system and apparatus using the same |
US8917614B2 (en) * | 2010-02-05 | 2014-12-23 | Qualcomm Incorporated | Resource allocation and transmission for coordinated multi-point transmission |
KR101674958B1 (en) * | 2010-03-05 | 2016-11-10 | 엘지전자 주식회사 | The apparatus and method for controlling inter-cell interference |
CA2784274C (en) * | 2010-03-17 | 2016-02-16 | Lg Electronics Inc. | Method and apparatus for providing channel state information-reference signal (csi-rs) configuration information in a wireless communication system supporting multiple antennas |
EP2410705B1 (en) * | 2010-07-20 | 2015-08-19 | NTT DoCoMo, Inc. | Apparatus and method for calculating receive parameters for an MIMO system |
US20120039185A1 (en) * | 2010-08-12 | 2012-02-16 | Futurewei Technologies, Inc. | System and Method for Providing Security in a Wireless Communications System |
KR20130088121A (en) * | 2010-08-18 | 2013-08-07 | 엘지전자 주식회사 | Method and apparatus for transmitting uplink data in a wireless access system |
US8891438B2 (en) | 2010-09-08 | 2014-11-18 | Intel Corporation | Packet-data network and methods for RAN-agnostic multimedia content distribution |
KR101671257B1 (en) * | 2010-09-12 | 2016-11-01 | 삼성전자주식회사 | Method and apparatus for map transmission in wireless communication system |
-
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- 2010-12-22 US US12/976,287 patent/US8599794B2/en active Active
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- 2011-08-29 WO PCT/US2011/049496 patent/WO2012033659A1/en active Application Filing
- 2011-08-29 EP EP11823965.6A patent/EP2614610A4/en not_active Withdrawn
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- 2011-08-29 CN CN201180053799.5A patent/CN103190085B/en active Active
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- 2013-08-20 US US13/971,117 patent/US20130336264A1/en not_active Abandoned
- 2013-11-12 US US14/077,556 patent/US9203577B2/en active Active
-
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- 2015-10-13 US US14/881,450 patent/US9788313B2/en active Active
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Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100177759A1 (en) * | 2009-01-13 | 2010-07-15 | Adc Telecommunications, Inc. | Systems and methods for ip communication over a distributed antenna system transport |
Non-Patent Citations (2)
Title |
---|
GONG P. ET AL.: "Radio resource allocation for multiuser OFDMA distributed antenna systems", 2009 PROCEEDINGS OF NETWORK INFRASTRUCTURE AND DIGITAL CONTENT, 8 November 2009 (2009-11-08), pages 912 - 916, XP031585903 * |
See also references of EP2614600A4 * |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9203577B2 (en) | 2010-09-08 | 2015-12-01 | Intel Corporation | Enhanced base station and method for communicating through an enhanced distributed antenna system (eDAS) |
US9788313B2 (en) | 2010-09-08 | 2017-10-10 | Intel Corporation | User equipment for receiving coordinated multi-point (COMP) transmissions |
US9179321B2 (en) | 2012-08-09 | 2015-11-03 | Axell Wireless Ltd. | Digital capacity centric distributed antenna system |
US9794791B2 (en) | 2012-08-09 | 2017-10-17 | Axell Wireless Ltd. | Digital capacity centric distributed antenna system |
US10396917B2 (en) | 2014-09-23 | 2019-08-27 | Axell Wireless Ltd. | Automatic mapping and handling PIM and other uplink interferences in digital distributed antenna systems |
US11064501B2 (en) | 2014-12-23 | 2021-07-13 | Axell Wireless Ltd. | Harmonizing noise aggregation and noise management in distributed antenna system |
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