CA2316377A1 - System for transporting frequency hopping signals - Google Patents
System for transporting frequency hopping signals Download PDFInfo
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- CA2316377A1 CA2316377A1 CA002316377A CA2316377A CA2316377A1 CA 2316377 A1 CA2316377 A1 CA 2316377A1 CA 002316377 A CA002316377 A CA 002316377A CA 2316377 A CA2316377 A CA 2316377A CA 2316377 A1 CA2316377 A1 CA 2316377A1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25752—Optical arrangements for wireless networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
- H04J1/02—Details
- H04J1/04—Frequency-transposition arrangements
-
- 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
- H04W88/085—Access point devices with remote components
Abstract
A system for transporting radio frequency (RF) signals across an RF network comprises a central transport unit (30) and a remote transport unit (50). The frequencies of at least some of the RF signals to be transported may hop in accordance with predetermined hopping sequences. The central transport unit (30) uses the hopping sequences to convert the hopping frequencies into fixed frequencies for efficient transport through the RF network. The remote transport unit (50) uses the hopping sequences to convert the fixed frequencies back to the original hopping frequencies. The transport system is also capable of reverse operation in the direction from the remote transport unit (50) to the central transport unit (30).
Description
SYSTEM FOR TRANSPORTING
FREQUENCY HOPPING SIGNALS
BACKGROUND OF THE INVENTION
Technical Field The present invention relates to radio frequency (RF) transport systems and, more specifically, to a RF transport system capable of efficiently transporting RF
signals from one or more RF transceivers which employ frequency hopping.
Related Prior Art Wireless communications services using RF signals became readily accessible to the general public with the advent of cellular radio systems. In a typical cellular radio system a geographical area (e.g., a metropolitan area) is divided into several to smaller, contiguous radio coverage areas, called "cells", which are served by a corresponding group of fixed radio stations, called "base stations", each of which includes a plurality of radio frequency ( RF) channel units (transceivers) that operate on a subset of the RF channels assigned to the system, as well known in the art.
The RF
channels allocated to any gim.n cell may be reallocated to a distant cell in accordance with a frequency reuse plan as is also well known in the art. In each cell, at least one RF channel, called the "control" or "paging/access" channel, is used to carry control or supervisory messages. The other RF channels are used to carry voice conversations and thus are called the "voice" or "speech" channels.
The cellular telephone users (mobile subscribers) in the aforementioned system 2o are usually provided with portable (hand-held), transportable (hand-carried) or mobile (car-mounted) telephone units, collectively referred to as "mobile stations", each of which communicates with a nearby base station. Each of the mobile stations includes a microphone, a loudspeaker, a controller (microprocessor) and a transceiver, as well known in the art. The transceiver in each mobile station may tune to any of the RF
channels specified in the system (whereas each of the transceivers in the base stations usually operates on only one of the different RF channels used in the corresponding cell).
The base stations in the aforementioned system are connected to and controlled by a mobile telephone switching office (MTSO) which, in turn, is connected to a local 3o central office in the landline (wireline) public switched telephone network (PSTN), or to a similar facility such as an integrated services digital network (ISDN).
The MTSo switches calls between wireline and mobile subscribers, controls signalling and assignment of voice channels to the mobile stations, performs " handoffs" of calls from one base station to another, compiles billing statistics, stores subscriber service profiles, and provides for the operation, maintenance and testing of the system.
The original cellular radio system, as described generally above, used analog transmission methods, specifically frequency modulation (FM), and duplex (two-way) RF channels in accordance with the Advanced Mobile Phone Service (AMPS]
standard. In the United States, this original AMPS (analog) architecture formed the basis for an industry standard sponsored by the Electronics Industries Association (EIA) and the Telecommunications Industry Association (TIA), and known as EIAlTIA-553. In the middle to late 1980s, however, the cellular industry both in the United States and in other parts of the world began migrating from analog to digital technology, motivated in large part by the need to address the steady growth in the subscriber population and the increasing demand on system capacity. The industry thus developed a number of air interface standards which use digital voice encoding (analog-to-digital conversion and voice compression) and advanced digital radio techniques, such as time division multiple access {TDMA) or code division multiple access (CDMA), to multiply the number of voice circuits (conversations) per RF
2o channel (i.e., to increase capacity).
In Europe and Japan, the GSM and PDC standards, respectively, both of which use TDMA, have been widely implemented. In the United States, the EIAITIA
has developed a number of digital standards, including IS-54 (TDMA) and IS-95 (CDMA), both of which are "dual mode" standards in that they support the use of the original AMPS analog voice channels (AVCHs) and analog control channel (ACCH), in addition to newer digital traffic channels (DTCHs) defined within the existing AMPS framework, so as to ease the transition from analog to digital and to allow the continued use of existing analog mobile stations. The dual-mode IS-54 standard, in particular, has become known as the digital AMPS (D-AMPS) standard. More 3o recently, the EIAlfIA has developed a new specification for D-AMPS, which includes a digital control channel (DCCH) suitable for supporting various data services, sometimes referred to as "personal communications services" (PCS), and extended mobile station battery life. This new specification, which builds on the IS-standard (the current revision of IS-54), is known as IS-136.
FREQUENCY HOPPING SIGNALS
BACKGROUND OF THE INVENTION
Technical Field The present invention relates to radio frequency (RF) transport systems and, more specifically, to a RF transport system capable of efficiently transporting RF
signals from one or more RF transceivers which employ frequency hopping.
Related Prior Art Wireless communications services using RF signals became readily accessible to the general public with the advent of cellular radio systems. In a typical cellular radio system a geographical area (e.g., a metropolitan area) is divided into several to smaller, contiguous radio coverage areas, called "cells", which are served by a corresponding group of fixed radio stations, called "base stations", each of which includes a plurality of radio frequency ( RF) channel units (transceivers) that operate on a subset of the RF channels assigned to the system, as well known in the art.
The RF
channels allocated to any gim.n cell may be reallocated to a distant cell in accordance with a frequency reuse plan as is also well known in the art. In each cell, at least one RF channel, called the "control" or "paging/access" channel, is used to carry control or supervisory messages. The other RF channels are used to carry voice conversations and thus are called the "voice" or "speech" channels.
The cellular telephone users (mobile subscribers) in the aforementioned system 2o are usually provided with portable (hand-held), transportable (hand-carried) or mobile (car-mounted) telephone units, collectively referred to as "mobile stations", each of which communicates with a nearby base station. Each of the mobile stations includes a microphone, a loudspeaker, a controller (microprocessor) and a transceiver, as well known in the art. The transceiver in each mobile station may tune to any of the RF
channels specified in the system (whereas each of the transceivers in the base stations usually operates on only one of the different RF channels used in the corresponding cell).
The base stations in the aforementioned system are connected to and controlled by a mobile telephone switching office (MTSO) which, in turn, is connected to a local 3o central office in the landline (wireline) public switched telephone network (PSTN), or to a similar facility such as an integrated services digital network (ISDN).
The MTSo switches calls between wireline and mobile subscribers, controls signalling and assignment of voice channels to the mobile stations, performs " handoffs" of calls from one base station to another, compiles billing statistics, stores subscriber service profiles, and provides for the operation, maintenance and testing of the system.
The original cellular radio system, as described generally above, used analog transmission methods, specifically frequency modulation (FM), and duplex (two-way) RF channels in accordance with the Advanced Mobile Phone Service (AMPS]
standard. In the United States, this original AMPS (analog) architecture formed the basis for an industry standard sponsored by the Electronics Industries Association (EIA) and the Telecommunications Industry Association (TIA), and known as EIAlTIA-553. In the middle to late 1980s, however, the cellular industry both in the United States and in other parts of the world began migrating from analog to digital technology, motivated in large part by the need to address the steady growth in the subscriber population and the increasing demand on system capacity. The industry thus developed a number of air interface standards which use digital voice encoding (analog-to-digital conversion and voice compression) and advanced digital radio techniques, such as time division multiple access {TDMA) or code division multiple access (CDMA), to multiply the number of voice circuits (conversations) per RF
2o channel (i.e., to increase capacity).
In Europe and Japan, the GSM and PDC standards, respectively, both of which use TDMA, have been widely implemented. In the United States, the EIAITIA
has developed a number of digital standards, including IS-54 (TDMA) and IS-95 (CDMA), both of which are "dual mode" standards in that they support the use of the original AMPS analog voice channels (AVCHs) and analog control channel (ACCH), in addition to newer digital traffic channels (DTCHs) defined within the existing AMPS framework, so as to ease the transition from analog to digital and to allow the continued use of existing analog mobile stations. The dual-mode IS-54 standard, in particular, has become known as the digital AMPS (D-AMPS) standard. More 3o recently, the EIAlfIA has developed a new specification for D-AMPS, which includes a digital control channel (DCCH) suitable for supporting various data services, sometimes referred to as "personal communications services" (PCS), and extended mobile station battery life. This new specification, which builds on the IS-standard (the current revision of IS-54), is known as IS-136.
2 PC'fIUS98127181 WO '99133295 Along with the emergence of digital cellular and PCS, there has been a trend towards the integration of telephone and data services with television (TV), computer and/or multimedia networks. FIG. 1 shows a typical RF transport system (inside dashed box) which interconnects a cellular or PCS radio base station (RBS) 10 with a mobile statioci (MS) 20. The RF transport system comprises a central transport unit 12, a RF transport network 14 and a remote transport unit 16. The central transport unit 12 receives a RF signal on a first frequency fx from the RBS 10 and converts that signal into a signal at a second frequency fy suitable for transmission over the RF
transport network 14. Depending on the application, the RF transport network 14 may 1o comprise, for example, a local area network (LAN), a wide area network (WAN), the global communications network known as the Internet, a wired or "wireless"
cable TV
network, a video network, a fiberoptic network or a point-to-point microwave network. The signal that is carried through the RF transport network 14 at frequency fy is finally provided to the remote transport unit 16 which converts this signal into a signal at a third frequency fZ for transmission through an antenna 18 to the MS 20.
The use of RF transport systems as generally depicted in FIG. 1 is complicated in practice by the use of frequency "hopping" at the base station. Some cellular or PCS systems, such as those which implement the GSM standard, vary (hop) the frequency of the signal transmitted from the base station to the mobile station over time 2o in order to reduce the deteriorative effects o~= Rayleigh fading {the phenomena wherein the received signal strength will vary due to multipath propagation of the transmitted signal). By rapidly changing the frequency of the transmitted signal from the base station, the fading locations will vary over the course of a call, thus decreasing the average depth and duration of fading dips at the mobile station. Of course, the receiver in the mobile station must hop along with the transmitter in order to correctly receive the signal. For this purpose, synchronization information regarding the relevant hopping sequence is usually transmitted from the base station to the mobile station over a broadcast or dedicated control channel.
FIG. 2 illustrates the use of frequency hopping at the RBS 10 shown in FIG.
1. The RBS 10 includes a plurality of transceivers 11 such as transceivers 1...5. One of the transceivers (e.g., transceiver 1) in the RBS 10 is used for control channel signalling and is assigned a fixed frequency f 1. Each of the other transceivers (e.g., transceivers 2...5) in the RBS 10, on the other hand, hops within a predefined set of frequencies such as f2-fs using a unique hopping sequence that defines the order of the frequencies at its output over time. For example, in a TDMA system wherein the
transport network 14. Depending on the application, the RF transport network 14 may 1o comprise, for example, a local area network (LAN), a wide area network (WAN), the global communications network known as the Internet, a wired or "wireless"
cable TV
network, a video network, a fiberoptic network or a point-to-point microwave network. The signal that is carried through the RF transport network 14 at frequency fy is finally provided to the remote transport unit 16 which converts this signal into a signal at a third frequency fZ for transmission through an antenna 18 to the MS 20.
The use of RF transport systems as generally depicted in FIG. 1 is complicated in practice by the use of frequency "hopping" at the base station. Some cellular or PCS systems, such as those which implement the GSM standard, vary (hop) the frequency of the signal transmitted from the base station to the mobile station over time 2o in order to reduce the deteriorative effects o~= Rayleigh fading {the phenomena wherein the received signal strength will vary due to multipath propagation of the transmitted signal). By rapidly changing the frequency of the transmitted signal from the base station, the fading locations will vary over the course of a call, thus decreasing the average depth and duration of fading dips at the mobile station. Of course, the receiver in the mobile station must hop along with the transmitter in order to correctly receive the signal. For this purpose, synchronization information regarding the relevant hopping sequence is usually transmitted from the base station to the mobile station over a broadcast or dedicated control channel.
FIG. 2 illustrates the use of frequency hopping at the RBS 10 shown in FIG.
1. The RBS 10 includes a plurality of transceivers 11 such as transceivers 1...5. One of the transceivers (e.g., transceiver 1) in the RBS 10 is used for control channel signalling and is assigned a fixed frequency f 1. Each of the other transceivers (e.g., transceivers 2...5) in the RBS 10, on the other hand, hops within a predefined set of frequencies such as f2-fs using a unique hopping sequence that defines the order of the frequencies at its output over time. For example, in a TDMA system wherein the
3
4, MAI. 2000 14: 32 EFA MUENCHEN +49 89 23994465 [ I , , NR. 9343 S. 9/16 ,. . , . .. . . ., , , " .. .
... , " ;
. . , . .... ',~ ., ... ., ., hopping sequence repeats every four bursts, the outputs of the frequcacy hopping transceivers (transceivers 2...5) may be as shown in FIG_ 3. Alternatively, it is possible to assign tech of the transceivers 2_..5 to a fixed frequency in the set f1-f5 and to generate the outputs shown in FTG. 3 by switching each input signal among those transceivers in accordance with the hopping sequence, as disclosed in WO
92109154.
When transmitting the various outputs of the frequency hopping traasceivexs (transceivers 2...5) through the RF transport network 14, xt is desirable that the various output frequency signals be "packed" together so as to make efficient use of to the available bandwidth in the network 14, and that these packed signals be translated into signals in some predcfmed area of the spectrum such, that they can coexist with other RF signals (e.g., cable TV or satellite signals) that are being simultaneously transmitted over the network 14. Upon exiti~ag the RF transport system, those packed and translated signals may be "unpacked" and translated back to their original frequencies fot transmission through the antenna 18 to the MS 20. Current implementations of RF transport systems, however, do not allow for such desired packing of the hopping frequencies. Rather, these systems use so-called "block conversion" in which a block of hopping frequencies from a transceiver is converted into an equal block of frequencies in a different part of the spectrum that is suitable for .
2o transmission oeer the network 14, without any packing of frequencies. This appxoach clearly wastes valuable bandwidth is the transport network.
The present invention seeks to overcome the shortco~oings of existing RP
transport systems by recognizing that if the hopping sequences used by transceivers 2...5 in the base station 10 (which is external to the RP transport system) are made k~town to the RF transport system, it will be able to pack the hopping frequencies at the central transport unit and to unpack them at the remote transport unit in a manner vc~hich would achieve the desired bandwidth efficiency gains.
Tn one aspect, the present invention provides a radio frequency (R~ transport 3o system, including a central transport unit and a remote transport unit, for efficiently transporting through a transport network a plurality of RF signals transmitted from a central station (e.g., radio base station) to at least one remote station (e.g., mobile station). The frequency of each of the RF signals may hop in accordance with a predetermined hopping sequence that is also transmitted from the central stafion to each ENO~CO SHEEN
EPA MUENCIiEN +49 89 23994465 NR. 9343 S. 10/16 4. MAI. 2000 14 : 32 , , f c r r s : ~ r r f ~ a -f r f f f ! ~' - .
t ( ( Y f f ~ r n L 4 t ! r . Y f r f f . a . . . i remote station (c.g., over a control channel from the base station to the mobile station), The central transport unit includes means for receiving the frequency hopping signals and the hopping sequences from the central station; means for respectively converting the central station signals into central unit signals; and means fox transmitting the central uaitt signals and the hopping sequences through the transport network.
The remote transport unit includes means foz' receiving the central unit signals and the hopping sequences from flat central transport unit; mesas for respectively~convezting the central unit signals into remote unit signals; and means for firansmitting the remote unit signals and the hopping sequences to the at least one remote station.
io The central transport unit of the present invention further includes means for decoding the hopping sequences received from the central station; and means for disfitibuting the detoded hopping sequences to the frequency conversion means in the central transport unit such that the central station frequency hopping signals can be z'espectively converted into central unit fixed frequency signals that can be efficiently paclted within a predetermined bandwidth before transmission to the remote transport unit The remote transport unit of the present invention further includes means for decoding the hopping sequences received from the central transport unit; and means for distributing the decoded hopping sequences to the frequency conversion means in the remiote transport unit such that the packed central unit fined frequency signals can zo be unpacked and converted into remote unit frequency hopping signals corresponding to the central station signals before transmission to the at least one remote station.
The RF transport system of the present invention is also capable of efficiently transporting RP signals from the remote station to the central station.
Accordingly, the frequency conversion means in the remote transport unit may respectively convert 2s frequency hopping signals from the at least one remote station into remote unit fixed 1 frequency signals that are effciently packed within a predetermined bandwidth for transmission to the central transport unit. In addition, the frequency conversion means in the central transport unit may respectively convert the remote unit fitted frequency signals into respective central. unit frequency hopping signals corresponding tv the 3o remote station signals for transmission to the central station.
These and other aspects of the present invention will become readily apparent from the detailed description taken in conjunction with the drawings, as set forth below.
... , " ;
. . , . .... ',~ ., ... ., ., hopping sequence repeats every four bursts, the outputs of the frequcacy hopping transceivers (transceivers 2...5) may be as shown in FIG_ 3. Alternatively, it is possible to assign tech of the transceivers 2_..5 to a fixed frequency in the set f1-f5 and to generate the outputs shown in FTG. 3 by switching each input signal among those transceivers in accordance with the hopping sequence, as disclosed in WO
92109154.
When transmitting the various outputs of the frequency hopping traasceivexs (transceivers 2...5) through the RF transport network 14, xt is desirable that the various output frequency signals be "packed" together so as to make efficient use of to the available bandwidth in the network 14, and that these packed signals be translated into signals in some predcfmed area of the spectrum such, that they can coexist with other RF signals (e.g., cable TV or satellite signals) that are being simultaneously transmitted over the network 14. Upon exiti~ag the RF transport system, those packed and translated signals may be "unpacked" and translated back to their original frequencies fot transmission through the antenna 18 to the MS 20. Current implementations of RF transport systems, however, do not allow for such desired packing of the hopping frequencies. Rather, these systems use so-called "block conversion" in which a block of hopping frequencies from a transceiver is converted into an equal block of frequencies in a different part of the spectrum that is suitable for .
2o transmission oeer the network 14, without any packing of frequencies. This appxoach clearly wastes valuable bandwidth is the transport network.
The present invention seeks to overcome the shortco~oings of existing RP
transport systems by recognizing that if the hopping sequences used by transceivers 2...5 in the base station 10 (which is external to the RP transport system) are made k~town to the RF transport system, it will be able to pack the hopping frequencies at the central transport unit and to unpack them at the remote transport unit in a manner vc~hich would achieve the desired bandwidth efficiency gains.
Tn one aspect, the present invention provides a radio frequency (R~ transport 3o system, including a central transport unit and a remote transport unit, for efficiently transporting through a transport network a plurality of RF signals transmitted from a central station (e.g., radio base station) to at least one remote station (e.g., mobile station). The frequency of each of the RF signals may hop in accordance with a predetermined hopping sequence that is also transmitted from the central stafion to each ENO~CO SHEEN
EPA MUENCIiEN +49 89 23994465 NR. 9343 S. 10/16 4. MAI. 2000 14 : 32 , , f c r r s : ~ r r f ~ a -f r f f f ! ~' - .
t ( ( Y f f ~ r n L 4 t ! r . Y f r f f . a . . . i remote station (c.g., over a control channel from the base station to the mobile station), The central transport unit includes means for receiving the frequency hopping signals and the hopping sequences from the central station; means for respectively converting the central station signals into central unit signals; and means fox transmitting the central uaitt signals and the hopping sequences through the transport network.
The remote transport unit includes means foz' receiving the central unit signals and the hopping sequences from flat central transport unit; mesas for respectively~convezting the central unit signals into remote unit signals; and means for firansmitting the remote unit signals and the hopping sequences to the at least one remote station.
io The central transport unit of the present invention further includes means for decoding the hopping sequences received from the central station; and means for disfitibuting the detoded hopping sequences to the frequency conversion means in the central transport unit such that the central station frequency hopping signals can be z'espectively converted into central unit fixed frequency signals that can be efficiently paclted within a predetermined bandwidth before transmission to the remote transport unit The remote transport unit of the present invention further includes means for decoding the hopping sequences received from the central transport unit; and means for distributing the decoded hopping sequences to the frequency conversion means in the remiote transport unit such that the packed central unit fined frequency signals can zo be unpacked and converted into remote unit frequency hopping signals corresponding to the central station signals before transmission to the at least one remote station.
The RF transport system of the present invention is also capable of efficiently transporting RP signals from the remote station to the central station.
Accordingly, the frequency conversion means in the remote transport unit may respectively convert 2s frequency hopping signals from the at least one remote station into remote unit fixed 1 frequency signals that are effciently packed within a predetermined bandwidth for transmission to the central transport unit. In addition, the frequency conversion means in the central transport unit may respectively convert the remote unit fitted frequency signals into respective central. unit frequency hopping signals corresponding tv the 3o remote station signals for transmission to the central station.
These and other aspects of the present invention will become readily apparent from the detailed description taken in conjunction with the drawings, as set forth below.
5 oE0 S~~ct~
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EPA 1NENCHEN +49 89 23994465 NR. 9343 S, 11/16 4. MAI. 2000 14:33 ,. " , ,., ;, " , . ; ; , , , . ; ; , . , , ,:
, y , . ,"~ ".
., "
The present invention will be better understood and its numerous objects and advantages will become apparent to those skilled is the art by reference to the following drawings in which:
FIG. 1 is a block diagram of an exemplary radio frequency (RP) transport system which inteaconnects a ra~o base station to a mobile station;
FIG. 2 is an illustration of the RF transport system of FIG. 1 in which fi:equenry "hopPu~" ~ wed by a number of transceivers in the base station;
FIG. 3 shows an exemplary frequency hopping sequence at the output of each to of the frequency' hopping transceivers in the base station of FIG. 2;
FIG. 4 shows the base station of FIG. 2 interconnected to a RP transport system constructed in accordance with the ptusent invention; and ' FIG. 5 shows an exemplary mapping of the output of each of the frequency hopping transceivers in the base station of FIG. 2 to a desired fixed frequency in the 15 RF transport sYstnm of FIG. 4.
.." .... ...~e~-~rvT1(1N OF THE INVFNTYON
Referring now to FIG. 4, a RF transport system constructed in accordance with the present invention comprises a central transport unit 30 which communicates with the RFS I0, and a remote transport wait 50 which eomatunicates with the MS 20.
z0 The central transport unit 30 includes a plurality of frequency conversion units 32 ) (units 1...5) for coa'~erting the respective outputs of the tzansceivers 11 (transceivers 1...5) into frequencies that are compatible with the transport network. In accordance with the present invention, the frequency conversion units 32 ate able to convexk both the fixed and hopping frequency signals froru the transceivers 11 into constant ' z5 frequency signals that may be efficiently packed together for transportation through the network" For this purpose, the system of the present invention detects the hopping sequences used by the frequency hopping transceivers 2...5 and provides those sequences to the corresponding frequency conversion units 2...5, which are then able to perform the necessary conversion from hopping frequencies to fixed frequencies.
3o As mentioned previously, information regarding the hopping sequences used by the tz~ansceivers 2...5, respectively, is transmitted over the control channel that is
~~N
EPA 1NENCHEN +49 89 23994465 NR. 9343 S, 11/16 4. MAI. 2000 14:33 ,. " , ,., ;, " , . ; ; , , , . ; ; , . , , ,:
, y , . ,"~ ".
., "
The present invention will be better understood and its numerous objects and advantages will become apparent to those skilled is the art by reference to the following drawings in which:
FIG. 1 is a block diagram of an exemplary radio frequency (RP) transport system which inteaconnects a ra~o base station to a mobile station;
FIG. 2 is an illustration of the RF transport system of FIG. 1 in which fi:equenry "hopPu~" ~ wed by a number of transceivers in the base station;
FIG. 3 shows an exemplary frequency hopping sequence at the output of each to of the frequency' hopping transceivers in the base station of FIG. 2;
FIG. 4 shows the base station of FIG. 2 interconnected to a RP transport system constructed in accordance with the ptusent invention; and ' FIG. 5 shows an exemplary mapping of the output of each of the frequency hopping transceivers in the base station of FIG. 2 to a desired fixed frequency in the 15 RF transport sYstnm of FIG. 4.
.." .... ...~e~-~rvT1(1N OF THE INVFNTYON
Referring now to FIG. 4, a RF transport system constructed in accordance with the present invention comprises a central transport unit 30 which communicates with the RFS I0, and a remote transport wait 50 which eomatunicates with the MS 20.
z0 The central transport unit 30 includes a plurality of frequency conversion units 32 ) (units 1...5) for coa'~erting the respective outputs of the tzansceivers 11 (transceivers 1...5) into frequencies that are compatible with the transport network. In accordance with the present invention, the frequency conversion units 32 ate able to convexk both the fixed and hopping frequency signals froru the transceivers 11 into constant ' z5 frequency signals that may be efficiently packed together for transportation through the network" For this purpose, the system of the present invention detects the hopping sequences used by the frequency hopping transceivers 2...5 and provides those sequences to the corresponding frequency conversion units 2...5, which are then able to perform the necessary conversion from hopping frequencies to fixed frequencies.
3o As mentioned previously, information regarding the hopping sequences used by the tz~ansceivers 2...5, respectively, is transmitted over the control channel that is
6 AMENDED SH~ET
ENCHEN +49 89 23994465 NR. 9343 S. 12/16 4. MAI. 2000 14: 33 EPA ,MU ' ., I . , _ .
;~
supported by transceiver 1 in the RBS 10. As shown in FIG. 4, the central.
transport unit 30 of the present invention includes a demodulator an,d decoder combination 34 for demodulating and decoding the control channel signal from transceiver 1, and a hopping sequence extraction and distribution unit 36 for extracting the inform.atioz~
regarding the hopping sequence used by eaoh of the transceivers 2...5 and for distributing that information to the appropriate one of the frequency conversion units 2.,.5. As shown in FICrs, 4-5, frequency conversion units 32 convert the outputs of the transceivers 11 into constant frequencies f,...f~, respectively, that are "packed"
(i.c., adjacent to each other) within the spectrum used by the transport network.
to As will be appreciated by persons of ordinary skill in. the art. each of the frequency conversion units 32 tnay be comprised of a programmable frequency synthesizer for generating a reference signal, and a mixer for combining the reference signal with the input frequency hopping signal to generate the desired fixed frequency signal. During operation, the frequency of the reference signal in each of the frequency conversion units z...5 may be dynatr<icglly programmed based on the corresponding hopping sequence information such that the output signal remains at a constant frequency. For example, referring to FIGs_ 3-5, during burst 1, the frequency at the output of transceiver 2 is f2 and the frequency of the reference signal in frequency conversion unit 2 may be set to (fb - f~. The mixer 'will tben generate the desired output frequency at fb_ Similarly, doting burst 2, the frequency at the output of transceiver 2 is f4 and the frequency of the reference signal in frequency conversion unit 2 may be set to {fb- f4) so as to again generate the desired output frequency fb. It will be noted that the reference signal in frequency conversion unit 1 can be set to (f a -f~) for allbursts since the fiequeztcy at the output of transceiver 1 is fixed at fl.
As the remote transport unit 50 must be able to "unpack" and reconvert the outputs of the frequency conversion units 32 to their original form for transmission to the MS 20 (and like mobile stations), the hopping sequence information is provided to a coder and modulator combination 38 and combined with the outputs of the frequency conversion units 32 in. a combiner 40 for transmission through the transport network 3o to the remote transport unit 50. 1n the remote transport unit 50 the received signals are first separated in a ~splitter 52 and the axed frequency sisals are fed to a plurality of frequency conversion units 54 (units 1.._5) that are structurally sizriilar to the frequency conversion units 32. The received hopping sequence inforrnatian is processed through a demodulator and decoder 56 and then fed to a hopping sequence
ENCHEN +49 89 23994465 NR. 9343 S. 12/16 4. MAI. 2000 14: 33 EPA ,MU ' ., I . , _ .
;~
supported by transceiver 1 in the RBS 10. As shown in FIG. 4, the central.
transport unit 30 of the present invention includes a demodulator an,d decoder combination 34 for demodulating and decoding the control channel signal from transceiver 1, and a hopping sequence extraction and distribution unit 36 for extracting the inform.atioz~
regarding the hopping sequence used by eaoh of the transceivers 2...5 and for distributing that information to the appropriate one of the frequency conversion units 2.,.5. As shown in FICrs, 4-5, frequency conversion units 32 convert the outputs of the transceivers 11 into constant frequencies f,...f~, respectively, that are "packed"
(i.c., adjacent to each other) within the spectrum used by the transport network.
to As will be appreciated by persons of ordinary skill in. the art. each of the frequency conversion units 32 tnay be comprised of a programmable frequency synthesizer for generating a reference signal, and a mixer for combining the reference signal with the input frequency hopping signal to generate the desired fixed frequency signal. During operation, the frequency of the reference signal in each of the frequency conversion units z...5 may be dynatr<icglly programmed based on the corresponding hopping sequence information such that the output signal remains at a constant frequency. For example, referring to FIGs_ 3-5, during burst 1, the frequency at the output of transceiver 2 is f2 and the frequency of the reference signal in frequency conversion unit 2 may be set to (fb - f~. The mixer 'will tben generate the desired output frequency at fb_ Similarly, doting burst 2, the frequency at the output of transceiver 2 is f4 and the frequency of the reference signal in frequency conversion unit 2 may be set to {fb- f4) so as to again generate the desired output frequency fb. It will be noted that the reference signal in frequency conversion unit 1 can be set to (f a -f~) for allbursts since the fiequeztcy at the output of transceiver 1 is fixed at fl.
As the remote transport unit 50 must be able to "unpack" and reconvert the outputs of the frequency conversion units 32 to their original form for transmission to the MS 20 (and like mobile stations), the hopping sequence information is provided to a coder and modulator combination 38 and combined with the outputs of the frequency conversion units 32 in. a combiner 40 for transmission through the transport network 3o to the remote transport unit 50. 1n the remote transport unit 50 the received signals are first separated in a ~splitter 52 and the axed frequency sisals are fed to a plurality of frequency conversion units 54 (units 1.._5) that are structurally sizriilar to the frequency conversion units 32. The received hopping sequence inforrnatian is processed through a demodulator and decoder 56 and then fed to a hopping sequence
7 t~EN~~O S
A MUENCHEN +49 69 23994465 NR.9343 S. 13/16 4. MAI. 2000 14:33 Ep ., " ."
',. , , . " , , , , , , ;, , ' , . ~ , , ; , .". ., " ,:, "w,.
distribution and extraction unit 58 which distributes the information to the appropriate ' frequency conversion units 2_..5. Once the received signals have been reconverted to their origznal frequencies in the frequency conversion units 54, they arc combined in a combiner b0 and transmitted through the antenna 18 to the MS 20 (and like mobile stations).
It will be noted that the operation of the present invention in the reverse direction from the MS 20 to the BS 10 is essentially a mirror image of the operation in the forward direction as described above. In, other words, the remote transport unit 50 will use the hopping sequence information received fmm the central transport unit 30 io to convert the hopping fxequeucy signal from the MS 20 (anal like Mobile statzons) into a fixed frequency signal ~arhich is transmitted to the central transport unit 30 to be reconverted back to its original hopping frequency (based on the setae hopping sequence information) before transmission to the BS 10. Thus, the txanspoit system of tt~c present invention is transparent to both the BS 10 and the MS 20 which continue to transmit and receive frequency hopping signals as usual.
'while ceztain forms or en7.bodiments of the present invention have been illustrated and described above, those skilled in the art will readily recognize that many modifications and variations may be made to, or substituted in, those forms or embodiments without substantially departing from the scope of the present invention.
2o Accordingly, the forms or embodiments of the present invention disclosed herein are exemplary and are not intended as a limitation on the scope of the present invention as defined in the following claims.
A MUENCHEN +49 69 23994465 NR.9343 S. 13/16 4. MAI. 2000 14:33 Ep ., " ."
',. , , . " , , , , , , ;, , ' , . ~ , , ; , .". ., " ,:, "w,.
distribution and extraction unit 58 which distributes the information to the appropriate ' frequency conversion units 2_..5. Once the received signals have been reconverted to their origznal frequencies in the frequency conversion units 54, they arc combined in a combiner b0 and transmitted through the antenna 18 to the MS 20 (and like mobile stations).
It will be noted that the operation of the present invention in the reverse direction from the MS 20 to the BS 10 is essentially a mirror image of the operation in the forward direction as described above. In, other words, the remote transport unit 50 will use the hopping sequence information received fmm the central transport unit 30 io to convert the hopping fxequeucy signal from the MS 20 (anal like Mobile statzons) into a fixed frequency signal ~arhich is transmitted to the central transport unit 30 to be reconverted back to its original hopping frequency (based on the setae hopping sequence information) before transmission to the BS 10. Thus, the txanspoit system of tt~c present invention is transparent to both the BS 10 and the MS 20 which continue to transmit and receive frequency hopping signals as usual.
'while ceztain forms or en7.bodiments of the present invention have been illustrated and described above, those skilled in the art will readily recognize that many modifications and variations may be made to, or substituted in, those forms or embodiments without substantially departing from the scope of the present invention.
2o Accordingly, the forms or embodiments of the present invention disclosed herein are exemplary and are not intended as a limitation on the scope of the present invention as defined in the following claims.
8 AMENDED Si-lEET
Claims (20)
1. A radio frequency (RF) transport system for transporting through a transport network (14) a plurality of RF signals transmitted from a central station (10) to at least one remote station (20), the frequency of each of said RF signals hopping in accordance with a predetermined hopping sequence that is also transmitted from said central station to said remote station, the transport system comprising a central transport unit (12, 30) and a remote transport unit (16, 50), said central transport unit including means for receiving said frequency hopping signals and said hopping sequences from said central station, means (32) for respectively converting said central station signals into central unit signals, and means (40) for transmitting said central unit signals and said hopping sequences through said transport network, said remote transport unit including means (52) for receiving said central unit signals and said hopping sequences from, said central transport unit, means (54) for respectively converting said central unit signals into remote unit signals, and means (60,18) for transmitting said remote unit signals and said hopping sequences to said at least one remote station, wherein:
said central transport unit (30) further includes means (34) for decoding said hopping sequences received from said central station, and means (36) for distributing said decoded hopping sequences to said frequency conversion means (32) in said central transport unit such that said central station frequency hopping signals can be respectively converted into central unit fixed frequency signals that can be efficiently packed within a predetermined bandwidth before transmission to said remote transport unit (50); and said remote transport unit (50) further includes means (56) for decoding said hopping sequences received from said central transport unit, and means (58) for distributing said decoded hopping sequences to said frequency conversion means (54) in said remote transport unit such that said packed central unit fixed frequency signals can be unpacked and converted into remote unit frequency hopping signals corresponding to said central station signals before transmission to said at least one remote station.
said central transport unit (30) further includes means (34) for decoding said hopping sequences received from said central station, and means (36) for distributing said decoded hopping sequences to said frequency conversion means (32) in said central transport unit such that said central station frequency hopping signals can be respectively converted into central unit fixed frequency signals that can be efficiently packed within a predetermined bandwidth before transmission to said remote transport unit (50); and said remote transport unit (50) further includes means (56) for decoding said hopping sequences received from said central transport unit, and means (58) for distributing said decoded hopping sequences to said frequency conversion means (54) in said remote transport unit such that said packed central unit fixed frequency signals can be unpacked and converted into remote unit frequency hopping signals corresponding to said central station signals before transmission to said at least one remote station.
2. The system of claim 1 wherein said network (14) comprises the Internet.
3. The system of claim 1 wherein said network (14) comprises a local area network (LAN).
4. The system of claim 1 wherein said network (14) comprises a wide area network (WAN).
5. The system of claim 1 wherein said network (14) comprises a wired or wireless cable TV network.
6, The system of claim 1 wherein said network (14) comprises a video network.
7. The system of claim 1 wherein said network (14) comprises a fiberoptic network.
8. The system of claim 1 wherein said network (14) comprises a point-to-point microwave network.
9. The system of claim 1 wherein:
said frequency conversion means (54) in said remote transport unit (50) also respectively converts frequency hopping signals from said at least one remote station (20) into remote unit fixed frequency signals that can be efficiently packed within a predetermined bandwidth for transmission to said central transport unit (30);
and said frequency conversion means (32) in said central transport unit (30) also respectively converts said remote unit fixed frequency signals into central unit frequency hopping signals corresponding to said remote station signals for transmission to said central station.
said frequency conversion means (54) in said remote transport unit (50) also respectively converts frequency hopping signals from said at least one remote station (20) into remote unit fixed frequency signals that can be efficiently packed within a predetermined bandwidth for transmission to said central transport unit (30);
and said frequency conversion means (32) in said central transport unit (30) also respectively converts said remote unit fixed frequency signals into central unit frequency hopping signals corresponding to said remote station signals for transmission to said central station.
10. The system of claim 9 wherein said central station (10) comprises a radio base station, said remote station (20) comprises a mobile station, and said hopping sequences are transmitted from said bast station to said mobile station over a control channel.
11. A method for transporting a plurality of radio frequency (RF) signals from a central station (10) to a plurality of remote stations (20) through a transport network (14) between a central transport unit (12, 30) and a remote transport unit (16, 50), the frequency of each of said RF signals hopping in accordance with a predetermined hopping sequence sent from said central station to each of said remote stations, said central transport unit receiving and respectively converting said central station signals into central unit signals for transmission through said transport network, and said remote transport unit receiving and respectively converting said central unit signals into remote unit signals for transmission to said remote station, the method comprising the steps of:
at said central transport unit (30), using said hopping sequences to allow the respective conversion of said central station frequency hopping signals into central unit fixed frequency signals that call be efficiently packed within a predetermined bandwidth before transmission to said remote transport unit (50); and at said remote transport unit (50), using said hopping sequences to allow the unpacking and respective conversion of said packed central unit fixed frequency signals into remote unit frequency hopping signals corresponding to said central station signals before transmission to said remote stations.
at said central transport unit (30), using said hopping sequences to allow the respective conversion of said central station frequency hopping signals into central unit fixed frequency signals that call be efficiently packed within a predetermined bandwidth before transmission to said remote transport unit (50); and at said remote transport unit (50), using said hopping sequences to allow the unpacking and respective conversion of said packed central unit fixed frequency signals into remote unit frequency hopping signals corresponding to said central station signals before transmission to said remote stations.
12. The method of claim 11 wherein said network (14) comprises the Internet
13. The method of claim 11 wherein said network (14) comprises a local area network (LAN).
14. The method of claim 11 wherein said network (14) comprises a wide area network (WAN).
15. The method of claim 11 wherein said network (14) comprises a wired or wireless cable TV network.
16. The method of claim 11 wherein said network (14) comprises a video network,
17. The method of claim 11 wherein said network (14) comprises a fiberoptic network.
18. The method of claim 11 wherein said network comprises a point-to-point microwave network.
19. The method of claim 11 further comprising the steps of:
at said remote transport unit (50), using said hopping sequences to allow the respective conversion of frequency hopping signal from said remote stations (20) into remote unit fixed frequency signals that can be efficiently packed within a predetermined bandwidth for transmission to said central transport unit (30);
and at said central transport unit (30), using said hopping sequences to allow the respective conversion of said remote unit fixed frequency signals into central unit frequency hopping signals corresponding to said remote station signals for transmission to said central station (10).
at said remote transport unit (50), using said hopping sequences to allow the respective conversion of frequency hopping signal from said remote stations (20) into remote unit fixed frequency signals that can be efficiently packed within a predetermined bandwidth for transmission to said central transport unit (30);
and at said central transport unit (30), using said hopping sequences to allow the respective conversion of said remote unit fixed frequency signals into central unit frequency hopping signals corresponding to said remote station signals for transmission to said central station (10).
20. The method of claim 19 wherein said central station (10) comprises a radio base station, said remote station (20) comprises a mobile station, and said hopping sequences are transmitted from said base station to said mobile station over a control channel.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/996,843 US6088381A (en) | 1997-12-23 | 1997-12-23 | System for transporting frequency hopping signals |
| US08/996,843 | 1997-12-23 | ||
| PCT/US1998/027181 WO1999033295A1 (en) | 1997-12-23 | 1998-12-21 | System for transporting frequency hopping signals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2316377A1 true CA2316377A1 (en) | 1999-07-01 |
Family
ID=25543367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002316377A Abandoned CA2316377A1 (en) | 1997-12-23 | 1998-12-21 | System for transporting frequency hopping signals |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US6088381A (en) |
| AR (1) | AR017963A1 (en) |
| AU (1) | AU2006799A (en) |
| BR (1) | BR9814413A (en) |
| CA (1) | CA2316377A1 (en) |
| TW (1) | TW400677B (en) |
| WO (1) | WO1999033295A1 (en) |
Families Citing this family (69)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2370170B (en) * | 2000-12-15 | 2003-01-29 | Ntl Group Ltd | Signal transmission systems |
| US20030058921A1 (en) * | 2001-09-26 | 2003-03-27 | Leeper David G. | Apparatus and method for handoff in a wireless network |
| US6985773B2 (en) | 2002-02-07 | 2006-01-10 | Cardiac Pacemakers, Inc. | Methods and apparatuses for implantable medical device telemetry power management |
| US20040125239A1 (en) * | 2002-12-26 | 2004-07-01 | David Rahn | Television tuner supporting channel hopping |
| US7379447B2 (en) * | 2003-05-02 | 2008-05-27 | Microsoft Corporation | Slotted seeded channel hopping for capacity improvement in wireless networks |
| US7639728B2 (en) * | 2003-07-08 | 2009-12-29 | Qualcomm Incorporated | Methods for generating and transmitting frequency hopped signals |
| US7702577B1 (en) | 2003-11-06 | 2010-04-20 | Jp Morgan Chase Bank, N.A. | System and method for conversion of initial transaction to final transaction |
| US7729726B2 (en) * | 2004-03-26 | 2010-06-01 | Nortel Networks Limited | Feeder cable reduction |
| EP1732645B1 (en) | 2004-04-07 | 2012-06-13 | Cardiac Pacemakers, Inc. | Rf wake-up of implantable medical device |
| US8135086B1 (en) | 2004-08-09 | 2012-03-13 | Rockstar Bidco, LP | Cable reduction |
| US7218969B2 (en) * | 2005-01-19 | 2007-05-15 | Cardiac Pacemakers, Inc. | Dynamic channel selection for RF telemetry with implantable device |
| US7664553B2 (en) | 2005-04-27 | 2010-02-16 | Cardiac Pacemakers, Inc. | System and method for enabling communications with implantable medical devices |
| US7801620B2 (en) * | 2005-08-29 | 2010-09-21 | Cardiac Pacemakers, Inc. | RF telemetry link quality assessment system and method |
| US20070133994A1 (en) * | 2005-12-09 | 2007-06-14 | Topseed Technology Corp. | Automatic frequency hopping remote controller |
| US8452333B2 (en) * | 2005-12-12 | 2013-05-28 | Apple Inc. | Feeder cable reduction |
| US20100035225A1 (en) * | 2006-07-11 | 2010-02-11 | President And Fellows Of Harvard College | Adaptive spaced teaching method and system |
| US8185204B2 (en) * | 2006-07-12 | 2012-05-22 | Cardiac Pacemakers, Inc. | Implantable medical device telemetry with adaptive frequency hopping |
| US7623922B2 (en) * | 2006-07-12 | 2009-11-24 | Cardiac Pacemakers, Inc. | Implantable medical device telemetry with periodic frequency hopping |
| US7787823B2 (en) | 2006-09-15 | 2010-08-31 | Corning Cable Systems Llc | Radio-over-fiber (RoF) optical fiber cable system with transponder diversity and RoF wireless picocellular system using same |
| US7848654B2 (en) | 2006-09-28 | 2010-12-07 | Corning Cable Systems Llc | Radio-over-fiber (RoF) wireless picocellular system with combined picocells |
| US8873585B2 (en) | 2006-12-19 | 2014-10-28 | Corning Optical Communications Wireless Ltd | Distributed antenna system for MIMO technologies |
| US8111998B2 (en) | 2007-02-06 | 2012-02-07 | Corning Cable Systems Llc | Transponder systems and methods for radio-over-fiber (RoF) wireless picocellular systems |
| US8046079B2 (en) * | 2007-03-13 | 2011-10-25 | Cardiac Pacemakers, Inc. | Implantable medical device telemetry with hop-on-error frequency hopping |
| US20100054746A1 (en) | 2007-07-24 | 2010-03-04 | Eric Raymond Logan | Multi-port accumulator for radio-over-fiber (RoF) wireless picocellular systems |
| US8175459B2 (en) | 2007-10-12 | 2012-05-08 | Corning Cable Systems Llc | Hybrid wireless/wired RoF transponder and hybrid RoF communication system using same |
| WO2009081376A2 (en) | 2007-12-20 | 2009-07-02 | Mobileaccess Networks Ltd. | Extending outdoor location based services and applications into enclosed areas |
| JP2012517190A (en) | 2009-02-03 | 2012-07-26 | コーニング ケーブル システムズ リミテッド ライアビリティ カンパニー | Fiber optic based distributed antenna system, components and related methods for monitoring and configuration thereof |
| US9673904B2 (en) | 2009-02-03 | 2017-06-06 | Corning Optical Communications LLC | Optical fiber-based distributed antenna systems, components, and related methods for calibration thereof |
| JP5480916B2 (en) | 2009-02-03 | 2014-04-23 | コーニング ケーブル システムズ リミテッド ライアビリティ カンパニー | Fiber optic based distributed antenna system, components, and related methods for calibration thereof |
| US8346091B2 (en) * | 2009-04-29 | 2013-01-01 | Andrew Llc | Distributed antenna system for wireless network systems |
| US8548330B2 (en) | 2009-07-31 | 2013-10-01 | Corning Cable Systems Llc | Sectorization in distributed antenna systems, and related components and methods |
| US8280259B2 (en) | 2009-11-13 | 2012-10-02 | Corning Cable Systems Llc | Radio-over-fiber (RoF) system for protocol-independent wired and/or wireless communication |
| US8275265B2 (en) | 2010-02-15 | 2012-09-25 | Corning Cable Systems Llc | Dynamic cell bonding (DCB) for radio-over-fiber (RoF)-based networks and communication systems and related methods |
| US9525488B2 (en) | 2010-05-02 | 2016-12-20 | Corning Optical Communications LLC | Digital data services and/or power distribution in optical fiber-based distributed communications systems providing digital data and radio frequency (RF) communications services, and related components and methods |
| US20110268446A1 (en) | 2010-05-02 | 2011-11-03 | Cune William P | Providing digital data services in optical fiber-based distributed radio frequency (rf) communications systems, and related components and methods |
| WO2012024247A1 (en) | 2010-08-16 | 2012-02-23 | Corning Cable Systems Llc | Remote antenna clusters and related systems, components, and methods supporting digital data signal propagation between remote antenna units |
| US9252874B2 (en) | 2010-10-13 | 2016-02-02 | Ccs Technology, Inc | Power management for remote antenna units in distributed antenna systems |
| CN203504582U (en) | 2011-02-21 | 2014-03-26 | 康宁光缆系统有限责任公司 | Distributed antenna system and power supply apparatus for distributing electric power thereof |
| CN103609146B (en) | 2011-04-29 | 2017-05-31 | 康宁光缆系统有限责任公司 | For increasing the radio frequency in distributing antenna system（RF）The system of power, method and apparatus |
| EP2702710A4 (en) | 2011-04-29 | 2014-10-29 | Corning Cable Sys Llc | Determining propagation delay of communications in distributed antenna systems, and related components, systems and methods |
| 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 |
| WO2013162988A1 (en) | 2012-04-25 | 2013-10-31 | Corning Cable Systems Llc | Distributed antenna system architectures |
| EP2883416A1 (en) | 2012-08-07 | 2015-06-17 | Corning Optical Communications Wireless Ltd. | Distribution of time-division multiplexed (tdm) management services in a distributed antenna system, and related components, systems, and methods |
| US9455784B2 (en) | 2012-10-31 | 2016-09-27 | Corning Optical Communications Wireless Ltd | Deployable wireless infrastructures and methods of deploying wireless infrastructures |
| 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) |
| US9647758B2 (en) | 2012-11-30 | 2017-05-09 | Corning Optical Communications Wireless Ltd | Cabling connectivity monitoring and verification |
| EP3008515A1 (en) | 2013-06-12 | 2016-04-20 | Corning Optical Communications Wireless, Ltd | Voltage controlled optical directional coupler |
| EP3008828B1 (en) | 2013-06-12 | 2017-08-09 | Corning Optical Communications Wireless Ltd. | Time-division duplexing (tdd) in distributed communications systems, including distributed antenna systems (dass) |
| US9247543B2 (en) | 2013-07-23 | 2016-01-26 | Corning Optical Communications Wireless Ltd | Monitoring non-supported wireless spectrum within coverage areas of distributed antenna systems (DASs) |
| US9661781B2 (en) | 2013-07-31 | 2017-05-23 | Corning Optical Communications Wireless Ltd | Remote units for distributed communication systems and related installation methods and apparatuses |
| US9385810B2 (en) | 2013-09-30 | 2016-07-05 | Corning Optical Communications Wireless Ltd | Connection mapping in distributed communication systems |
| US9178635B2 (en) | 2014-01-03 | 2015-11-03 | Corning Optical Communications Wireless Ltd | Separation of communication signal sub-bands in distributed antenna systems (DASs) to reduce interference |
| US9775123B2 (en) | 2014-03-28 | 2017-09-26 | Corning Optical Communications Wireless Ltd. | Individualized gain control of uplink paths in remote units in a distributed antenna system (DAS) based on individual remote unit contribution to combined uplink power |
| US9357551B2 (en) | 2014-05-30 | 2016-05-31 | Corning Optical Communications Wireless Ltd | Systems and methods for simultaneous sampling of serial digital data streams from multiple analog-to-digital converters (ADCS), including in distributed antenna systems |
| 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 |
| US9730228B2 (en) | 2014-08-29 | 2017-08-08 | Corning Optical Communications Wireless Ltd | Individualized gain control of remote uplink band paths in a remote unit in a distributed antenna system (DAS), based on combined uplink power level in the remote unit |
| US9602210B2 (en) | 2014-09-24 | 2017-03-21 | Corning Optical Communications Wireless Ltd | Flexible head-end chassis supporting automatic identification and interconnection of radio interface modules and optical interface modules in an optical fiber-based distributed antenna system (DAS) |
| US9420542B2 (en) | 2014-09-25 | 2016-08-16 | Corning Optical Communications Wireless Ltd | System-wide uplink band gain control in a distributed antenna system (DAS), based on per band gain control of remote uplink paths in remote units |
| US10659163B2 (en) | 2014-09-25 | 2020-05-19 | Corning Optical Communications LLC | Supporting analog remote antenna units (RAUs) in digital distributed antenna systems (DASs) using analog RAU digital adaptors |
| WO2016071902A1 (en) | 2014-11-03 | 2016-05-12 | Corning Optical Communications Wireless Ltd. | Multi-band monopole planar antennas configured to facilitate improved radio frequency (rf) isolation in multiple-input multiple-output (mimo) antenna arrangement |
| WO2016075696A1 (en) | 2014-11-13 | 2016-05-19 | Corning Optical Communications Wireless Ltd. | Analog distributed antenna systems (dass) supporting distribution of digital communications signals interfaced from a digital signal source and analog radio frequency (rf) communications signals |
| 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 |
| WO2016098111A1 (en) | 2014-12-18 | 2016-06-23 | Corning Optical Communications Wireless Ltd. | Digital- analog interface modules (da!ms) for flexibly.distributing digital and/or analog communications signals in wide-area analog distributed antenna systems (dass) |
| WO2016098109A1 (en) | 2014-12-18 | 2016-06-23 | Corning Optical Communications Wireless Ltd. | Digital interface modules (dims) for flexibly distributing digital and/or analog communications signals in wide-area analog distributed antenna systems (dass) |
| US20160249365A1 (en) | 2015-02-19 | 2016-08-25 | Corning Optical Communications Wireless Ltd. | Offsetting unwanted downlink interference signals in an uplink path in a distributed antenna system (das) |
| US9681313B2 (en) | 2015-04-15 | 2017-06-13 | Corning Optical Communications Wireless Ltd | Optimizing remote antenna unit performance using an alternative data channel |
| US9948349B2 (en) | 2015-07-17 | 2018-04-17 | Corning Optical Communications Wireless Ltd | IOT automation and data collection system |
| US10560214B2 (en) | 2015-09-28 | 2020-02-11 | Corning Optical Communications LLC | Downlink and uplink communication path switching in a time-division duplex (TDD) distributed antenna system (DAS) |
| US10236924B2 (en) | 2016-03-31 | 2019-03-19 | Corning Optical Communications Wireless Ltd | Reducing out-of-channel noise in a wireless distribution system (WDS) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4850036A (en) * | 1987-08-21 | 1989-07-18 | American Telephone And Telegraph Company | Radio communication system using synchronous frequency hopping transmissions |
| FI86124C (en) * | 1990-11-15 | 1992-07-10 | Telenokia Oy | RADIOSAENDARMOTTAGARSYSTEM. |
| US5506863A (en) * | 1993-08-25 | 1996-04-09 | Motorola, Inc. | Method and apparatus for operating with a hopping control channel in a communication system |
| US5537434A (en) * | 1993-10-25 | 1996-07-16 | Telefonaktiebolaget Lm Ericsson | Frequency hopping control channel in a radio communication system |
| FI107419B (en) * | 1995-01-26 | 2001-07-31 | Nokia Networks Oy | Cellular radio system, repeater and base station |
| FI950916A (en) * | 1995-02-28 | 1996-08-29 | Nokia Telecommunications Oy | Base station in a radio system |
-
1997
- 1997-12-23 US US08/996,843 patent/US6088381A/en not_active Expired - Lifetime
-
1998
- 1998-12-18 TW TW087121207A patent/TW400677B/en not_active IP Right Cessation
- 1998-12-21 AU AU20067/99A patent/AU2006799A/en not_active Abandoned
- 1998-12-21 CA CA002316377A patent/CA2316377A1/en not_active Abandoned
- 1998-12-21 WO PCT/US1998/027181 patent/WO1999033295A1/en active Application Filing
- 1998-12-21 BR BR9814413-8A patent/BR9814413A/en not_active IP Right Cessation
- 1998-12-22 AR ARP980106634A patent/AR017963A1/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| WO1999033295A8 (en) | 1999-08-19 |
| TW400677B (en) | 2000-08-01 |
| WO1999033295A1 (en) | 1999-07-01 |
| AU2006799A (en) | 1999-07-12 |
| BR9814413A (en) | 2000-10-10 |
| US6088381A (en) | 2000-07-11 |
| AR017963A1 (en) | 2001-10-24 |
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