WO2001018996A1 - Packet transmission method - Google Patents
Packet transmission method Download PDFInfo
- Publication number
- WO2001018996A1 WO2001018996A1 PCT/US2000/024826 US0024826W WO0118996A1 WO 2001018996 A1 WO2001018996 A1 WO 2001018996A1 US 0024826 W US0024826 W US 0024826W WO 0118996 A1 WO0118996 A1 WO 0118996A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- base station
- header
- frame
- mobile station
- bit pattern
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 7
- 230000005540 biological transmission Effects 0.000 title description 5
- 230000001413 cellular effect Effects 0.000 description 6
- 230000010267 cellular communication Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000013442 quality metrics Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/711—Interference-related aspects the interference being multi-path interference
- H04B1/7115—Constructive combining of multi-path signals, i.e. RAKE receivers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
-
- 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
- H04B7/022—Site diversity; Macro-diversity
-
- 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
- H04L47/43—Assembling or disassembling of packets, e.g. segmentation and reassembly [SAR]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
- H04W36/304—Reselection being triggered by specific parameters by measured or perceived connection quality data due to measured or perceived resources with higher communication quality
-
- 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
- H04W88/12—Access point controller devices
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W92/00—Interfaces specially adapted for wireless communication networks
- H04W92/04—Interfaces between hierarchically different network devices
- H04W92/12—Interfaces between hierarchically different network devices between access points and access point controllers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/22—Parsing or analysis of headers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/40—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection
Definitions
- the present invention pertains to packet transmission, and more particularly to packet transmission between cellular base transceiver stations and network switches.
- the loading may include data, control messages, or other information relating to mobile station or base transceiver station operation.
- the data payload portion of the packet or frame may comprise fill bits. The RNC ignores these fill bits.
- Backhaul loading can limit the overall system capacity. In many situations, backhaul loading is not a problem. However, as data demands rise, and capacity reaches its limits in existing systems, backhaul loading can limit system capacity. Accordingly, what is needed is a method of reducing loading without negatively impacting on communications.
- FIG. 1 is block diagram illustrating a cellular communication system.
- FIG. 2 illustrates a frame or packet communicated between the base transceiver stations and the network in the communication system according to FIG. 1.
- DETAILED DESCRIPTION OF THE DRAWINGS A wireless system includes base station transceivers to communicate with at least one mobile station, the base station transceivers communicate with a network controller. The base station controls a header for a packet frame to be communicated between the base station transceiver and the network controller wherein a portion of the header identifies the frame as one containing no data package.
- the data bits of the header field may contain a predetermined bit pattern for a frame including no data package.
- Information received by the base station from the mobile station may be dropped, and the header information replaced with the specified bit pattern, if a decoding metric passes a threshold.
- the information received by the base station from the mobile station may be dropped, and the header information replaced with the specified bit pattern, if a CRC for the frame received from the mobile station fails.
- a cellular system 100 is disclosed in FIG. 1.
- the illustrated cellular system 100 is a code division multiple access system including a plurality of base transceiver stations (BTS) 102-104 in communication with a mobile station MS 108 that communicate over respective wireless communication paths.
- BTS base transceiver stations
- the base transmission stations 102-103 are connected to a mobile switching system network 110.
- the infrastructure responsible for controlling, coordinating, and initializing base transceiver stations, is commonly known as the central base station controller (CBSC), or radio network controller (RNC), or the selection/distribution unit (SDU).
- CBSC central base station controller
- RNC radio network controller
- SDU selection/distribution unit
- Digital cellular systems of this type are well known.
- backhaul communications are made between the BTS and network controller both for system control and outgoing communications.
- a bit or unassigned bit pattern is added to a header in the packet 200 (FIG. 2).
- an existing bit field in the header for communications between the base transceiver station and the network controller to indicate that the data payload is empty.
- SER signal error rate
- Reverse Link Information This field is used to indicate signal quality. If a payload is not present, the field can be advantageously employed to transmit a predetermined bit pattern (or one bit of the octet can be a flag) indicating that a payload is not present.
- the BTSs 102-104 insert the predetermined bit, or pattern, into the selected field when transmitting a signal to the RNC 110.
- the RNC checks to see if the predetermined pattern, or flag bit, in the header indicate whether "Reverse Link Information", referred to herein as payload is present. If the payload is present, it is processed in the ordinary manner. If a payload is not present, the frame is processed in the same manner as if the payload was all fill bits.
- CRC cyclic redundancy check
- a bit pattern of the frame type bit field of the packet header can be selected to indicate that a payload is not attached. Alternately a new field can be used in the packet header.
- the invention can be advantageously employed to more efficiently use the reverse backhaul bandwidth by not passing up filler data for frame intervals when none of the fingers allocated by a BTS to a given user are in lock.
- An example of where fill data is transmitted in existing systems is when none of the channel demodulator's (fingers) corresponding to a given mobile station (or end user equipment) communication link are in "lock", which can happen to the weaker serving leg during soft handoff to a stronger serving leg.
- Normal operation at the base transceiver station (BTS) of a code division multiple access (CDMA) cellular system requires assigning fingers to the signal paths received at a serving base station in communication with a mobile station.
- BTS base transceiver station
- CDMA code division multiple access
- Finger assignment is determined by a set of finger management rules applied to active (active meaning that fingers (demodulators) are currently assigned to the offset)_pseudo noise (PN) offsets and potential PN offset candidates after each search time interval.
- PN offset candidates are determined by the searcher when the energy of a given signal path exceeds some search threshold.
- Active PN offsets have fingers assigned to them and are demodulated followed by soft combining and decoding. When a finger's energy assigned to an active PN offset goes below a "lock" threshold, the finger is deassigned such that no demodulation takes place for that finger and it no longer is used in diversity combining. The deassigned finger can then be assigned to a more promising PN candidate if one exists. If the searcher does not detect any PN offsets with sufficient energy to report to the finger manager and the existing active active
- backhaul bandwidth refers to the required communications bandwidth between base transceiver stations and the infrastructure responsible for controlling, coordinating, and initializing base transceiver stations typically known as the CBSC, or RNC, or SDU). Therefore, inter-carrier soft handoff is provided herein which provides an indication for the situation where a header is returned to the RNC alone without a data payload. This concept can be extended to the case when frames are erased
- the decision on whether to send a payload or an erased frame can be made a soft decision by using a threshold based on symbol error rate (SER), or some similar frame quality metric, as some erased frames still have useful information and the corresponding payload is needed at the RNC.
- SER symbol error rate
- Examples of quality frame metrics that can be used for the decision of whether to transmit the data include a total metric or a bit energy metric (BER) such as the estimated signal to interference ratio (SIR), signal to noise ratio (SNR) or Eb/Nt, or the like.
- a system for assigning a new bit or using an unallocated bit pattern of an existing field in the packet header to indicate the absence of the data payload portion of the packet. This allows a reduction of the average backhaul bandwidth. This is particularly advantageous when none of the user allocated fingers are in lock at a given service base transceiver station (BTS), but can also be extended for erased frames with high SER at the discretion of the carrier/operator.
- BTS service base transceiver station
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001522697A JP4659318B2 (en) | 1999-09-08 | 2000-09-08 | Packet transmission method |
BR0013572-0A BR0013572A (en) | 1999-09-08 | 2000-09-08 | Packet transmission method |
AU71296/00A AU7129600A (en) | 1999-09-08 | 2000-09-08 | Packet transmission method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15274199P | 1999-09-08 | 1999-09-08 | |
US60/152,741 | 1999-09-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001018996A1 true WO2001018996A1 (en) | 2001-03-15 |
Family
ID=22544220
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2000/024707 WO2001018991A1 (en) | 1999-09-08 | 2000-09-08 | Link selection in a communication system |
PCT/US2000/024826 WO2001018996A1 (en) | 1999-09-08 | 2000-09-08 | Packet transmission method |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2000/024707 WO2001018991A1 (en) | 1999-09-08 | 2000-09-08 | Link selection in a communication system |
Country Status (6)
Country | Link |
---|---|
JP (2) | JP4695803B2 (en) |
KR (2) | KR100464470B1 (en) |
CN (2) | CN1274160C (en) |
AU (2) | AU7129600A (en) |
BR (2) | BR0013572A (en) |
WO (2) | WO2001018991A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007063446A3 (en) * | 2005-12-01 | 2007-10-25 | Ericsson Telefon Ab L M | Erased frame and idle frame suppression in a backhaul connection |
US8289899B2 (en) | 2008-02-18 | 2012-10-16 | Fujitsu Limited | Communication method and intermediate network device with branch selection functions |
CN106533531A (en) * | 2016-10-14 | 2017-03-22 | 上海微小卫星工程中心 | Manmade satellite communication device |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SG115481A1 (en) * | 2001-06-13 | 2005-10-28 | Ntt Docomo Inc | Mobile communication systems, mobile communication methods, base stations, mobile stations, and signal transmission methods in the mobile communication systems |
CA2453619A1 (en) * | 2001-07-05 | 2003-01-16 | Nortel Networks Limited | Method for monitoring radio equipment for communication between a mobile terminal and a cellular infrastructure with spectrum dispersion and arrangement for performing said method |
FR2827098B1 (en) | 2001-07-05 | 2003-12-05 | Nortel Networks Ltd | METHOD FOR CONTROLLING RADIO RESOURCES ASSIGNED TO COMMUNICATION BETWEEN A MOBILE TERMINAL AND A SPREAD-SPECTRUM CELLULAR INFRASTRUCTURE, AND EQUIPMENT FOR IMPLEMENTING THE METHOD |
US7190673B2 (en) | 2002-06-26 | 2007-03-13 | Interdigital Technology Corporation | Method and system that improves interoperability of a radio network controller and a base station in cellular system with downlink congestion control |
US8400979B2 (en) | 2003-01-07 | 2013-03-19 | Qualcomm Incorporated | Forward link handoff for wireless communication systems with OFDM forward link and CDMA reverse link |
EP1659807A1 (en) * | 2003-08-29 | 2006-05-24 | Mitsubishi Denki Kabushiki Kaisha | Mobile station and communication system |
EP1566896A1 (en) * | 2004-02-18 | 2005-08-24 | Siemens Aktiengesellschaft | Method of communication using a plurality of network transmission antennas |
JP4527119B2 (en) * | 2004-08-05 | 2010-08-18 | 三菱電機株式会社 | Base station, mobile communication terminal apparatus and primary cell selection method |
US7565110B2 (en) * | 2004-09-17 | 2009-07-21 | Alcatel-Lucent Usa Inc. | Method for determining rise over thermal for a reverse link in a wireless system |
US7889692B2 (en) * | 2004-09-30 | 2011-02-15 | Alcatel-Lucent Usa, Inc. | Packet error rate estimation in a communication system |
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US4910794A (en) * | 1988-08-04 | 1990-03-20 | Norand Corporation | Mobile radio data communication system and method |
US5469471A (en) * | 1994-02-01 | 1995-11-21 | Qualcomm Incorporated | Method and apparatus for providing a communication link quality indication |
US5493563A (en) * | 1993-07-26 | 1996-02-20 | Motorola, Inc. | Method and apparatus for mobile assisted handoff in a communication system |
US5615210A (en) * | 1994-01-11 | 1997-03-25 | Ntt Mobile Communications Network Inc. | Mobile radio communications system |
US6049535A (en) * | 1996-06-27 | 2000-04-11 | Interdigital Technology Corporation | Code division multiple access (CDMA) communication system |
Family Cites Families (16)
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JP2854346B2 (en) * | 1989-09-19 | 1999-02-03 | 日本電信電話株式会社 | Channel assignment method |
US4977612A (en) * | 1989-10-10 | 1990-12-11 | Motorola, Inc. | Channel selection in a multi-frequency radio data communication system |
US5309503A (en) * | 1991-12-06 | 1994-05-03 | Motorola, Inc. | Dynamic channel assignment in a communication system |
JP2616244B2 (en) * | 1993-05-18 | 1997-06-04 | 日本電気株式会社 | Channel allocation method for mobile communication system |
JP2661533B2 (en) * | 1993-12-27 | 1997-10-08 | 日本電気株式会社 | Channel allocation method for mobile communication system |
JP2795151B2 (en) * | 1993-12-28 | 1998-09-10 | 日本電気株式会社 | Multiplexing of system information and voice for simplified mobile phone system |
US5491837A (en) * | 1994-03-07 | 1996-02-13 | Ericsson Inc. | Method and system for channel allocation using power control and mobile-assisted handover measurements |
JP2974274B2 (en) * | 1994-05-12 | 1999-11-10 | エヌ・ティ・ティ移動通信網株式会社 | Transmission power control method and transmission power control device |
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-
2000
- 2000-09-08 AU AU71296/00A patent/AU7129600A/en not_active Abandoned
- 2000-09-08 AU AU79831/00A patent/AU7983100A/en not_active Abandoned
- 2000-09-08 JP JP2001522692A patent/JP4695803B2/en not_active Expired - Lifetime
- 2000-09-08 WO PCT/US2000/024707 patent/WO2001018991A1/en not_active Application Discontinuation
- 2000-09-08 CN CNB008125635A patent/CN1274160C/en not_active Expired - Lifetime
- 2000-09-08 KR KR10-2002-7003082A patent/KR100464470B1/en not_active IP Right Cessation
- 2000-09-08 KR KR1020027003083A patent/KR20020030807A/en active Search and Examination
- 2000-09-08 JP JP2001522697A patent/JP4659318B2/en not_active Expired - Lifetime
- 2000-09-08 WO PCT/US2000/024826 patent/WO2001018996A1/en active IP Right Grant
- 2000-09-08 BR BR0013572-0A patent/BR0013572A/en not_active Application Discontinuation
- 2000-09-08 CN CNB008126690A patent/CN1158788C/en not_active Expired - Lifetime
- 2000-09-08 BR BRPI0013604-2B1A patent/BR0013604B1/en not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US4910794A (en) * | 1988-08-04 | 1990-03-20 | Norand Corporation | Mobile radio data communication system and method |
US5493563A (en) * | 1993-07-26 | 1996-02-20 | Motorola, Inc. | Method and apparatus for mobile assisted handoff in a communication system |
US5615210A (en) * | 1994-01-11 | 1997-03-25 | Ntt Mobile Communications Network Inc. | Mobile radio communications system |
US5469471A (en) * | 1994-02-01 | 1995-11-21 | Qualcomm Incorporated | Method and apparatus for providing a communication link quality indication |
US6049535A (en) * | 1996-06-27 | 2000-04-11 | Interdigital Technology Corporation | Code division multiple access (CDMA) communication system |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007063446A3 (en) * | 2005-12-01 | 2007-10-25 | Ericsson Telefon Ab L M | Erased frame and idle frame suppression in a backhaul connection |
US7376102B2 (en) | 2005-12-01 | 2008-05-20 | Telefonaktiebolaget Lm Ericsson (Publ) | Erased frame and idle frame suppression in a wireless communications system |
US8289899B2 (en) | 2008-02-18 | 2012-10-16 | Fujitsu Limited | Communication method and intermediate network device with branch selection functions |
CN106533531A (en) * | 2016-10-14 | 2017-03-22 | 上海微小卫星工程中心 | Manmade satellite communication device |
Also Published As
Publication number | Publication date |
---|---|
BR0013572A (en) | 2002-04-30 |
CN1158788C (en) | 2004-07-21 |
CN1385005A (en) | 2002-12-11 |
BR0013604A (en) | 2002-11-26 |
JP2003509895A (en) | 2003-03-11 |
KR20020030807A (en) | 2002-04-25 |
JP4659318B2 (en) | 2011-03-30 |
BR0013604B1 (en) | 2013-12-03 |
JP2003510862A (en) | 2003-03-18 |
CN1373943A (en) | 2002-10-09 |
CN1274160C (en) | 2006-09-06 |
KR100464470B1 (en) | 2005-01-03 |
JP4695803B2 (en) | 2011-06-08 |
AU7129600A (en) | 2001-04-10 |
KR20020029785A (en) | 2002-04-19 |
WO2001018991A1 (en) | 2001-03-15 |
AU7983100A (en) | 2001-04-10 |
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