WO2007101406A1 - Système et procédé de communication radio par relais - Google Patents

Système et procédé de communication radio par relais Download PDF

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Publication number
WO2007101406A1
WO2007101406A1 PCT/CN2007/000730 CN2007000730W WO2007101406A1 WO 2007101406 A1 WO2007101406 A1 WO 2007101406A1 CN 2007000730 W CN2007000730 W CN 2007000730W WO 2007101406 A1 WO2007101406 A1 WO 2007101406A1
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Prior art keywords
data
physical layer
downlink
processing unit
user terminal
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PCT/CN2007/000730
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English (en)
Chinese (zh)
Inventor
Ruobin Zheng
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Huawei Technologies Co., Ltd.
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Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2007101406A1 publication Critical patent/WO2007101406A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/15557—Selecting relay station operation mode, e.g. between amplify and forward mode, decode and forward mode or FDD - and TDD mode

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a wireless relay communication system and method. Background technique
  • IEEE 802.16 is a broadband wireless access standard. There are two main versions: Broadband fixed wireless access version of 802.16 standard, Broadband mobile wireless access version of "802.16-2004" and 802.16 standard, "802.16e,.. 802.16-2004 Two network elements, BS (Base Station) and subscriber station (SS, Subsciber Station) are defined; 802.16e also defines two network elements, BS and Mobile Subsciber Station (MSS, Mobile Subsciber Station). The concept of WiMAX relay station (RS, Relay Station), which acts as a relay between BS and SS/MSS, expands the coverage of BS or increases the throughput of subscriber stations.
  • RS WiMAX relay station
  • OFDM Orthogonal Frequency Division Multiplex
  • OFDMA Orthogonal Frequency Division Multiplex Access
  • the OFDMA symbol is composed of subcarriers, and the number of subcarriers determines the number of points of the Fast Fourier Transform (FFT).
  • the subcarriers constituting one subchannel may or may not be adjacent, and Fig. 1 is an example in which subcarriers are adjacent.
  • FFT Fast Fourier Transform
  • Data subcarrier a subcarrier used to transmit data
  • Pilot subcarrier a subcarrier used for conducting frequencies
  • Empty subcarrier Not used to transmit any number of subcarriers, including Guard Band and DC Subcarrier.
  • Subchannel division is an FDMA method, all The effective subcarrier is divided into several subcarrier sets, and each subcarrier set is called a subchannel.
  • the duplex mode can be FDD and TDD
  • the FDD mode SS can be half-duplex FDD
  • the duplex mode can only be TDD.
  • the 802.16 OFDMA (or SOFDMA) frame structure under TDD is shown in Figure 2.
  • a physical layer (PHY) burst in OFDMA (or SOFDMA) is assigned a set of adjacent subchannels and a set of OFDMA symbols.
  • Each frame includes a downlink subframe (DL subframe ) and an uplink subframe (UL subframe.
  • DL subframe downlink subframe
  • UL subframe uplink subframe
  • a burst can be allocated to an SS/MSS on the uplink (or one)
  • the group user can be sent to the SS/MSS by the BS as a sending unit in the downlink.
  • the initial access ranging Ranging, periodic ranging Ranging, and bandwidth request of the uplink SS are all performed by the Ranging Subchannel.
  • the downlink subframe has a preamble.
  • the code starts for physical synchronization; then the frame control header (FCH) is used to specify the profile of one or more downlink Bursts immediately following the FCH and its length. Then the downlink mapping table DL-MAP is used. For indicating the sub-letter and OFDMA symbol position and usage profile of each burst, the uplink mapping table (UL-MAP) is used to indicate the subchannel and OFDMA symbol position and the usage profile of each burst.
  • TTG and RTG will be inserted when the uplink and downlink subframes alternate, to allow a period of time for the BS to complete the transmission and reception.
  • the OFDMA (or SOFDMA) frame structure differs in that the uplink subframe and the downlink subframe are transmitted at different frequencies, and there is no need to set TTG and RTG.
  • Network coding can be divided into linear network coding and convolutional network coding.
  • linear network coding For details, see IEEE papers: Li, Yeung & Cai, "Linear Network Coding,” IEEE Trans. Info. Thy, Feb. 2003.
  • the RS and the BS and the MS/SS communicate by using the FDD single carrier mode, and the MS/SS performs the wireless relay access to the BS through the RS, and the RS acts as an MS/SS access BS.
  • the DL BS is a downlink subframe of a physical layer frame of the BS, from the BS to the SS/MS BS or the RS, and the UL BS is an uplink subframe of the physical layer frame of the BS , and is SS MS BS or RS to the BS; 01 ⁇ is 1 8
  • the downlink subframe of the physical layer frame, BS to SS/MS RS or RS, UL RS is the uplink subframe of the physical layer frame of RS, from 88 8 ⁇ or 18 to BS.
  • the base station and the subscriber station need to exchange 4 times of time slots through the relay station: time slot 1 , BS to RS; time slot 2, MS to RS; time slot 3, RS to MS; time slot 4, RS to BS.
  • each transit data is sent twice, so the throughput of the transit system is low, and the network capacity is limited, which affects the scale and cost of the network.
  • a relay communication method and system according to an embodiment of the present invention can maximize throughput.
  • An embodiment of the present invention provides a wireless relay communication system, including: a base station BS, a relay station RS, and a user terminal,
  • the RSs are respectively provided with an interface for communicating with a BS and a user terminal, and the RS includes a frequency division duplex FDD wireless transceiver and a network link-based wireless link layer processing unit;
  • Both the BS and the user terminal include an FDD wireless transceiver and a network link-based wireless link layer processing unit;
  • the FDD radio transceivers of the RS, BS and user terminals comprise an FDD radio transmitter physical layer processing unit and an FDD radio receiver physical layer processing unit;
  • the FDD radio transmitter physical layer processing unit of the RS corresponds to the FDD radio receiver physical layer processing unit in the BS and the user terminal, respectively; the FDD radio receiver physical layer processing unit of the RS and the FDD transmitter physics in the BS and the user terminal, respectively Layer processing unit corresponding;
  • the radio link layer processing unit in the RS processes and network codes the data from the physical layer processing unit of the FDD radio receiver, and then sends the data to the corresponding transmission processing unit;
  • the wireless link layer processing unit in the BS and the user terminal performs network decoding on the received data and sends the received data to the corresponding transmission processing unit and the user respectively;
  • the RS and the BS and the user terminal perform wireless communication by using a frequency division duplex FDD mode.
  • An embodiment of the present invention provides a wireless communication method, including the following steps:
  • the downlink middle rotor channel is set in the subframe, and is used to define a medium rotor channel and an OFDMA symbol combination of the downlink medium rotor channel of the RS receiving BS, and an uplink medium rotor channel is set in the downlink subframe of the RS physical layer frame structure for defining the RS.
  • the OFDMA wireless relay communication is performed by using the FDD method between the BS, the RS, and the user terminal based on the uplink and downlink physical layer frames of the BS and the RS.
  • the embodiment of the present invention further provides another wireless relay communication method, including the following steps:
  • the base station BS sends downlink data to the station RS in an FDD manner in a downlink downlink rotor channel of the BS, and buffers the data;
  • the user terminal sends uplink relay data to the RS in an FDD manner, and buffers the data in an OFDM subchannel that is sent to the station RS uplink subframe except the downlink subframe header, the reverse ranging subchannel, and the uplink subchannel;
  • the RS performs network coding processing on the downlink forwarding data of the BS and the uplink forwarding data of the user terminal, and then sends the data to the BS and the user terminal in an FDD manner;
  • the BS and the user terminal perform network decoding processing on the cached data and the network-coded transit data sent by the RS, and obtain uplink data of the user terminal and downlink transit data of the BS, respectively.
  • the throughput of the transit system is maximized, and the throughput can be increased by 25% in theory, which is effective. It overcomes the shortcomings of the prior art, such as low throughput and limited network capacity, which affects the scale and cost of the network.
  • network system communication has mutual interference between base stations, stations and subscriber stations.
  • the OFDMA (or OFDM subchannel) physical layer frame structure defined based on the characteristics of the network coding technology effectively supports the OFDMA (or OFDM subchannel) wireless transit function, that is, the MS/SS can Wireless relay access to the BS through the RS.
  • the prior art "RS to SS MS BS”, "BS to SS MS RS “, “SS/MS BS to RS,,””SS/MS RS to BS” and “RS to RS”self-interference; avoids "RS to SS/MS RS “interference;avoidable” SS/MS BS to BS,, “SS/MS RS to RS”, “SS/MS RS to SS MS BS “, “SS/MS BS to SS/MS RS ,” interference.
  • FIG. 1 is a schematic diagram of adjacent conditions of OFDMA symbol subcarriers
  • FIG. 2 is a schematic diagram of an 802.16 OFDMA (or SOFDMA) frame structure based on TDD;
  • FIG. 3 is a schematic diagram of a transit mode of an existing wireless relay communication system;
  • FIG. 5 is an OFDM (or OFDMA) cylinder transit system based on network coding technology in an embodiment of the present invention
  • Figure 6 Schematic diagram of the same-frequency interference mode of network system communication based on FDD
  • FIG. 7 is a schematic structural diagram of a network coding-based transit system in an embodiment of the present invention
  • FIG. 8 is a schematic diagram showing a physical layer frame structure of a BS and an RS in an advanced relay mode according to an embodiment of the present invention
  • FIG. 9 is a schematic diagram showing a physical layer frame structure of a BS and an RS in a simplified transit mode in an embodiment of the present invention. . detailed description
  • FIG. 4 is a schematic diagram of an OFDM (or OFDMA) advanced transit system model based on network coding technology in an embodiment of the present invention, in which FDS/OFDMA (or OFDM subchannel) communication is used between RS and BS, MS/SS, BS.
  • FDS/OFDMA or OFDM subchannel
  • the downlink and RS uplinks use the frequency fl
  • the BS uplink and the RS downlink use the frequency f2
  • the RS only needs to have one set of FDD wireless transceivers.
  • the MS/SS performs wireless relay access to the BS through the RS, and the RS acts as an MS/SS access BS.
  • the DL BS is a downlink subframe of a physical layer frame of the BS, from the BS to the SS/MS BS or the RS, and the UL BS is an uplink subframe of the physical layer frame of the BS , by the SS/MS BS or the RS to the BS; 01 ⁇ is 1 8 downlink subframes of the physical layer frame, from BS to 88 8 ⁇ or 188! ⁇ is! ⁇
  • the base station and the subscriber station need to exchange 2 timeslots through the relay station:
  • slot 1 the packet A of the BS and the packet B of the MS are respectively sent to the RS through different OFDM subchannels, the BS buffer packet A, and the MS buffer packet B.
  • the RS encodes the packet A of the BS and the packet B of the MS, for example, directly performing an exclusive OR operation on the bit.
  • time slot 2 the RS broadcasts the packet of the network coding to the BS and the MS at the same time; the BS performs network decoding, and performs the XOR of the buffer packet A and the network coded packet, and the operation processing is obtained.
  • the downlink broadcast burst (Broadcast Burst) of the DLBS, such as Preamble, FCH, DL-MAP, and UL-MAP, is directly sent by the BS to the MS/SS, and does not pass through the RS; the initial access ranging of the MS/SS is Ranging.
  • Ranging bandwidth request through the ULBS ranging subchannel Ranging Subchannel, directly sent by the MS/SS to the BS, not through the RS; for other downlink bursts of the DLBS, such as data packets or DL-MAP
  • the message packets outside the UL-MAP cannot be directly sent by the BS to the MS/SS, and must be relayed through the RS; other bursts of the uplink of the ULBS, such as the initial access ranging Ranging except the MS/SS, and the periodic ranging Ranging
  • it cannot be directly sent to the BS by the MS/SS, and must be relayed through the RS.
  • FIG. A network coding based relay communication system in the embodiment of the present invention as shown in FIG. among them,
  • the base station includes:
  • Transmission processing unit capable of establishing communication with a higher-level device (such as a base station controller) or with a group of base station devices, and performing information with the upper-level device or each base station device Interaction
  • FDD wireless transceiver used for wireless communication with RS or SS/MS in FDD mode, consisting of FDD wireless transmitter physical layer processing unit, FDD wireless receiver physical layer processing unit and wireless data link layer processing unit.
  • FDD radio transmitter physical layer processing unit (frequency fl): physical layer processing unit of FDD radio receiver 1 in the SS/MS and the physical layer processing unit of the FDD radio receiver in the RS/MS
  • the processing unit performs wireless communication; for simplifying the transfer mode, the unit uses the channel coding of the downlink subframe header of the DL BS (such as Preamble, FCH, DL-MAP, UL-MAP) to be more reliable than other transmission data.
  • Modulation mode (such as binary phase shift keying BPSK), or use higher transmission power than other transmitted data, directly sent by the BS to the MS/SS, not through the RS;
  • FDD wireless transmitter physical layer processing unit performs wireless communication
  • the wireless data link layer processing unit the data from the physical layer processing unit of the FDD wireless receiver is subjected to data reception processing and network decoding of the wireless data link layer, and then forwarded to the wired transmission processing unit; for the cable transmission processing unit The data is sent to the physical layer processing unit of the FDD wireless transmitter after being processed by the wireless data link layer.
  • User stations include:
  • FDD wireless transceivers 1 and 2 for F1 wireless communication with the BS or RS, physical layer processing unit for FDD wireless transmitters 1 and 2, physical layer processing unit for FDD wireless receivers 1 and 2, and FDD wireless
  • the wireless data link layer processing unit of transceivers 1 and 2 is composed.
  • FDD radio transmitter 1 physical layer processing unit wirelessly communicates with the FDD radio transceiver 1 and 2 data link layers and the FDD radio receiver physical layer processing unit in the BS with which it can communicate; In the transit mode, the unit has an uplink random access time slot (or called a contention slot) of the UL BS , such as an initial Ranging competing time slot and a bandwidth request competing time slot, or MS/ SS initial access ranging Ranging, periodic ranging Ranging.
  • Bandwidth request through the UL BS ranging subchannel Ranging Subchannel using more reliable channel coding and modulation than other transmitted data (such as binary phase shift keying BPSK), or use higher transmission power than other transmitted data, directly sent to the BS by the MS/SS, not through the RS;
  • BPSK binary phase shift keying
  • FDD radio transmitter 2 physical layer processing unit wirelessly communicates with the FDD radio transceiver 1 and 2 data link layers and the FDD radio receiver physical layer processing unit in the RS with which it can communicate;
  • FDD radio receiver 1 physical layer processing unit (frequency fl): wirelessly communicating with the FDD radio transmitter physical layer processing unit in the wireless data link layer and the BS with which it can communicate;
  • FDD radio receiver 2 physical layer processing unit (frequency is ): wirelessly communicating with the radio transmitter physical layer processing unit in the radio data link layer and the RS with which it can communicate;
  • Wireless data link layer processing unit Data from the FDD wireless receiver 1 and/or 2 physical layer processing unit is used for data reception processing and network decoding of the wireless data link layer, and then forwarded to the data. The data from the user is sent to the FDD wireless transmitter 1 and/or 2 physical layer processing unit after being processed by the wireless data link layer.
  • the transfer station includes:
  • FDD wireless transceiver used for wireless communication with SS/MS or BS in FDD mode, consisting of FDD wireless transmitter physical layer processing unit, FDD wireless receiver physical housing processing unit and wireless data link layer processing unit.
  • FDD radio transmitter physical layer processing unit wirelessly communicates with the wireless data link layer and the FDD radio receiver 2 physical layer processing unit or BS FDD radio receiver physical layer processing unit in the SS MS that can communicate with it;
  • FDD wireless receiver physical layer processing unit wirelessly communicate with the wireless data link layer and the physical layer processing unit;
  • the wireless data link layer processing unit performs data reception processing, network coding, and transmission processing on the data layer of the FDD radio receiver from the physical layer processing unit of the FDD radio receiver, and then forwards the data to the physical layer processing unit of the FDD radio transmitter.
  • the physical layer frame structure of the BS and RS in the simplified transit mode is:
  • a "DL Relay Subchannel" is defined to define a BS downlink intermediate rotor channel and OFDMA transmitted by the BS to the RS. Symbol combination; for the case of multiple RSs, different downstream rotor channels are defined for different RSs;
  • DL Relay Subchannel is defined to define the middle rotor channel and QFDMA of the DL Relay Subchannel of the RS receiving BS.
  • the uplink subframe of the physical layer frame structure of the BS is f2 (UL BS ), defined as "UL Relay Subchannel", used to define the combination of the uplink rotor channel and OFDMA symbols transmitted by the RS to the BS; for the case of multiple RSs, for different RS definitions Different upstream mid-rotor channels;
  • the TDM technology is adopted in the downlink subframe (DL RS ) of the frequency of the physical layer frame structure of the RS , and the "UL Relay Subchannel" is added to define the middle rotor of the UL Relay Subchannel of the RS receiving BS.
  • Channel and OFDMA symbol combination for multiple RS cases, different RSs only transmit the relay data of the BS in the corresponding uplink middle rotor channel, and other subchannels cannot schedule the relay transmission;
  • the SS/MS BS does not arrange any transmit subchannel and OFDMA symbol combinations to avoid "SS/MS BS to BS"interference;
  • SS/MS RS does not arrange any Transmitting a transmission subchannel and an OFDMA symbol combination to avoid "SS/MS RS to RS"interference;
  • Relay is defined in the uplink subframe (UL BS ) of the frequency of the physical layer frame structure of the BS .
  • Ranging Subchannel defines the initial access ranging Ranging for RS, periodic ranging Ranging, bandwidth requesting BS reverse ranging receiving subchannel and OFDMA symbol combination;
  • the ranging subchannel RRS can also be used as the initial access ranging Ranging, periodic ranging Ranging, bandwidth request ranging subchannel of the SS MS BS .
  • the downlink subframe (DL) of the frequency of the physical layer frame structure of the RS is ⁇ RS) is defined in "Relay ranging TX subchannel (relay ranging transmitting subchannel, abbreviated as RRS TX) is used to define the ranging RS initial access ranging, periodic ranging, the ranging, RS relay ranging transmitting subchannel bandwidth request Combined with the OFDMA symbol.
  • RRS TX relay ranging transmitting subchannel
  • the BS transmitter and the different RS receiver share the remaining part of the BS downlink subframe or the RS RX uplink subframe through different subchannels and OFDMA symbol combinations, respectively, with the SS /MS BS and SS/MS RS communication, avoiding the interference of "SS/MS R j SS/MS BS ".
  • the BS receiver and the different RS transmitters share the rest of the RS downlink subframe or the BS uplink subframe through different subchannels and OFDMA symbol combinations, respectively.
  • DL Header in a downlink subframe (DL BS ) of a frequency of the physical layer frame structure of the BS , which is a start of a downlink subframe, and is used to define a subchannel for transmitting user synchronization information and
  • the OFDMA symbol combines and transmits the subchannel and the OFDMA symbol of the indication information to indicate the location and usage profile of each subchannel and OFDMA symbol combination of the BS physical layer frame structure downlink subframe and the uplink subframe.
  • the preamble, FCH, DL-MAP, UL-MAP, SS/MS BS , RS, and BS in the original 802.16 OFDMA (or SOFDMA) frame are included to maintain the transmission and reception frame synchronization.
  • a "DL Header RX (Downstream Header Reception)" is defined in an uplink subframe (UL RS ) of a frequency of the physical layer frame structure of the RS , which is used to define a subchannel and an OFDMA symbol combination of the DL Header of the receiving BS.
  • the time-frequency relationship between the DL Header of the BS and the DL Header RX of the RS must be - corresponding, strictly synchronized.
  • Ranging Subchannel is defined in the uplink subframe (UL BS ) of the frequency of the physical layer frame structure of the BS , and the initial access ranging Ranging for the SS/MS BS is defined, and the periodic ranging is performed. Ranging, bandwidth-requested BS ranging receive subchannel and OFDMA symbol combination.
  • the physical layer frame structure of the BS and the RS of the advanced relay mode in the embodiment of the present invention as shown in FIG. 9 further includes: defining a "DL Header" in a downlink subframe (DL RS ) of the frequency of the physical layer frame structure of the RS .
  • (downlink subframe header) is the start of the downlink subframe, and is used to define a subchannel and OFDMA symbol combination for transmitting user synchronization information and a subchannel and OFDMA symbol combination for transmitting indication information to indicate the RS physical layer frame structure downlink
  • the location and usage profile of each subchannel and OFDMA symbol combination of the frame and the uplink subframe Contains preamble, FCH, DL-MAP, UL-MAP, SS/MS RS and RS in the original 802.16 OFDMA (or SOFDMA) frame to maintain frame synchronization.
  • the uplink subframe (UL BS ) of the BS does not arrange any combination of the receiving subchannel and the OFDMA symbol, avoiding the interference of "SS/MS BS to SS/MS RS ,”.
  • the downlink subframe (DL RS ) of the physical layer frame structure of other RSs cannot arrange any transmission subchannel and OFDMA symbol combination to avoid "RS to SS/MS RS "interference; or, if different RSs
  • the DL Headers overlap in time, they must be completely overlapping, strictly synchronized, and their contents must be the same to avoid "RS to SS MS RS " interference.
  • RRS Relay Ranging Subchannel
  • NULL in Figures 8 and 9 is the portion where no reception or transmission is arranged.
  • the "white area” in the BS downlink subframe (DL BS ) and the RS downlink subframe (DL RS ) is the DL Header; the "white area” in the RS uplink subframe (UL RS ) is the DL Header RX.
  • the transit communication process based on the physical layer frame structure and the secondary system includes:
  • the first stage (base station to transit):
  • the base station sends a preamble reamble in a first symbol symbol or time slot in a downlink subframe (DL BS ) "DL Header" of frequency fl;
  • DL BS downlink subframe
  • the relay station receives the preamble reamble in the base station downlink subframe (DL BS ) "DL Header” through the “DL Header RX” in the intermediate station uplink subframe (UL RS ) of the frequency fl, and synchronizes with the BS;
  • the base station sends the FCH, DL-MAP, UL-MAP after the downlink subframe (DL BS ) "DL Header" preamble of frequency fl;
  • the relay station receives the FCH, DL-MAP, UL-MAP of the downlink subframe (DL BS ) "DL Header” in the intermediate station uplink subframe (UL RS ) of frequency f 1 ": DL Header RX" Time slot, subchannel and/or OFDMA symbol position and profile information of each burst burst of the base station downlink and uplink;
  • the base station sends the downlink relay communication data A to the relay station in the "DL Relay Subchannel" of the downlink subframe (DL BS ) of the frequency fl; the base station caches the data A;
  • the relay station passes the DL Relay in the uplink subframe (UL RS ) of the relay station with the frequency fl
  • the Subchannel "receives the downlink relay communication data A transmitted by the base station in S5.
  • the second stage (user station to transfer station):
  • the user station receives the preamble preamble in the downlink sub-frame (DL RS ) "DL Header" of the relay station, and synchronizes with the relay station;
  • DL RS downlink sub-frame
  • the relay station sends FCH, DL-MAP, UL-MAP after the downlink subframe (DL RS ) "DL Header" preamble with a frequency of £;
  • the subscriber station receives the downlink sub-frame (DL RS ) of the relay station with the frequency f2 "DL Header" FCH, DL-MAP, UL-MAP, obtaining sub-channel and OFDMA symbol position and usage profile information of each burst of the downlink and uplink of the relay station;
  • DL RS downlink sub-frame
  • the subscriber station is in the intermediate subframe (UL RS ) of the relay station with the frequency fl, and sends the uplink communication data B to the station in the OFDM Subchannel except the DL Header RX, the RRS and the UL Relay Subchannel; the subscriber station caches the data B. ;
  • UL RS intermediate subframe
  • the relay station receives the uplink communication data B sent by the subscriber station in step S5 from the corresponding OFDM Subchannel with the frequency fl;
  • the "DL Relay Subchannel" of the first stage S6 and the OFDM Subchannel of the second stage step S6 may be selected in the same relay station uplink subframe to reduce the transit delay.
  • the third stage (network coding):
  • the fourth stage (middle to base station and subscriber station):
  • the relay station transmits a preamble preamble in the first symbol symbol or slot in the downlink subframe (DL RS ) "DL Header" of frequency f2;
  • the subscriber station receives the preamble preamble in the downlink sub-frame (DL RS ) "DL Header" of the frequency transfer station f2, and the relay station ear is synchronized;
  • DL RS downlink sub-frame
  • the relay station sends the FCH, DL-MAP, UL-MAP in the downlink subframe (DL RS ) "DL Header" preamble with frequency f?; the relay station specifically indicates the base station's transit destination user station in the DL MAP UL Relay Subchannel receives data;
  • DL RS downlink subframe
  • the subscriber station receives the FCH, DL-MAP, UL-MAP of the downlink subframe (DL RS ) "DL Header" of frequency G, and obtains the time slot, subchannel and/or OFDMA symbol of each burst of the downlink and uplink of the relay station.
  • DL RS downlink subframe
  • DL Header DL Header
  • the relay station transmits the network-encoded data C to the base station and the relay in the "UL Relay Subchannel" of the downlink sub-frame (DL RS ) of the frequency transfer station;
  • the destination subscriber station receives the network coded data C, BS transmitted by the relay station from the "UL Relay Subchannel" of the frequency f2 of step S5 according to the indication of the relay station in the DL MAP, from the "UL” of the frequency of step S5.
  • Relay Subchannel receives the network coded data C sent by the relay station; the fifth stage (network decoding): 551.
  • the destination subscriber station decodes the buffered data B and the received network coded data C to obtain the data A that the base station transits through the relay station, for example, the data B buffered by the destination subscriber station and the network coded data A®B.
  • step S1 and step S2 have no affiliation.
  • the present invention defines the physical layer frame structure of the BS and the RS by introducing an OFDMA (or OFDM subchannel) technology and a network coding technology mechanism, thereby maximally increasing the throughput of the wireless relay communication system, and Effectively avoid all kinds of interference that may exist.
  • OFDMA OFDM subchannel

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Abstract

L'invention porte sur un système de communication radio par relais comprenant une station de base (SB), une station-relais (SR) et un terminal utilisateur; la station relais crée les interfaces de communication avec la station de base et le terminal utilisateur séparément, et la station-relais comprend un émetteur-récepteur radio duplex à répartition en fréquence (DRF) et un processeur de couche de liaison radio sur la base d'une technologie de décodage de réseau. La station de base et le terminal utilisateur comprennent un émetteur-récepteur radio DRF et un processeur de couche de liaison radio sur la base d'une technologie de décodage de réseau. L'émetteur-récepteur radio DRF de la station-relais, la station de base et le terminal utilisateur comprennent un processeur de couche physique de l'émetteur radio DRF et un processeur de couche physique du récepteur radio DRF. Le processeur de couche physique de l'émetteur radio DRF et le processeur de couche physique du récepteur radio DRF de la station-relais correspondent au processeur de couche physique de l'émetteur radio DRF et au processeur de couche physique du récepteur radio DRF du terminal utilisateur. De plus, dans l'invention, un procédé de communication par relais basé sur le système pourrait accroître efficacement le rendement du relais.
PCT/CN2007/000730 2006-03-08 2007-03-07 Système et procédé de communication radio par relais WO2007101406A1 (fr)

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