CN101034931B - Radio forwarding communication system and method - Google Patents

Radio forwarding communication system and method Download PDF

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Publication number
CN101034931B
CN101034931B CN200610054861.3A CN200610054861A CN101034931B CN 101034931 B CN101034931 B CN 101034931B CN 200610054861 A CN200610054861 A CN 200610054861A CN 101034931 B CN101034931 B CN 101034931B
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base station
downlink
sub
physical layer
transfer
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CN101034931A (en
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郑若滨
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XFusion Digital Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to PCT/CN2007/000730 priority patent/WO2007101406A1/en
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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

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

An interim wireless communications system, including base stations BS, transit stations and user terminals RS; the RS and BS respectively, provide user terminals and communication interface, the RS includes a frequency division duplex FDD wireless transceiver and network-based coding technology wireless link layer processing unit; BS and end users FDD - included in both wireless transceiver and decoding technology based on the wireless network link layer processing unit; RS, BS and user terminals FDD wireless transceiver contains the wireless transmitter FDD physical layer processing units and wireless receiver FDD physical layer processing unit; the transmitter RS FDD physical layer department rationale receiver modules and FDD physical layer processing unit with BS and user terminals in receiver FDD physical layer processing units and wireless transmitter FDD physical layer processing unit counterparts. In addition, the inventionincludes a transit system based on the communication method whichcanincrease the throughput of transit.

Description

Wireless transfer communication system and method
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a network coding based Orthogonal Frequency Division Multiplexing Access (OFDMA) wireless relay communication system and method.
Background
The ieee 802.16 is the first broadband wireless access standard, and has two major versions: the broadband fixed wireless access version of the 802.16 standard, "802.16-2004" and the broadband mobile wireless access version of the 802.16 standard, "802.16 e". 802.16-2004 defines only two network elements, BS and SS; 802.16e also defines only two network elements, BS and MSS. Currently, 802.16multi hop Relay SG (802.16 multi-hop Relay research group) only proposes the concept of WiMAX Relay Station (RS), wherein an important role is to serve as a Relay between the BS and the SS/MSS, to expand the coverage of the BS or to increase the throughput of the subscriber station. It is a new topic of the modification and enhancement that the physical layer frame structure of BS, RS and MS/SS should be made to support RS.
In one Channel (Channel) of an Orthogonal Frequency Division Multiplexing (OFDM) or Orthogonal Frequency Division Multiplexing Access (OFDMA) system (e.g., an 802.16 system), OFDM or OFDMA symbols thereof are composed of subcarriers (subcarriers), and the number of subcarriers determines the number of points of Fast Fourier Transform (FFT). The subcarriers constituting one Subchannel (Subchannel) may or may not be adjacent, and fig. 1 is an example of the subcarriers being adjacent. There are several types of subcarriers by the kind of data to be transmitted:
1. data subcarrier: a subcarrier for transmitting data;
2. pilot subcarrier: a subcarrier for transmitting a pilot;
3. null sub-carriers: is not used to transmit any number of sub-carriers including Guard Band (Guard Band) and direct current sub-carrier (DC Subcarrier).
In an OFDM or OFDMA system, different users divide the FFT space of the uplink, each user transmitting on one or more subchannels. The division of sub-channels is an FDMA method, and all effective sub-carriers are divided into several sub-carrier sets, each sub-carrier set is called a sub-channel (subchannel). There are three main approaches to molecular channel division:
the first is to divide the carriers into contiguous groups, which is the simplest to implement and the adjacent sub-channel interference is small, but the frequency diversity obtained is less effective.
The second is that the carriers of different sub-channels are interleaved in a regular way, which is better for frequency diversity, but the system is more sensitive to inter-sub-channel interference.
The third is an improvement over the second, in which carriers of different sub-channels are interleaved in a pseudo-random manner, and different base stations use different permuting codes to reduce interference between base stations.
In the 802.16 standard, for a licensed frequency band, the duplex mode may be FDD and TDD, an SS in the FDD mode may be half-duplex FDD, and for an unlicensed frequency band, the duplex mode may only be TDD. 802.16OFDMA (or SOFDMA) frame structure under TDD, as shown in fig. 2. In the 802.16OFDMA (or SOFDMA) scheme, a physical layer (PHY) burst (burst) in OFDMA (or SOFDMA) is allocated a set of adjacent subchannels and a set of OFDMA symbols (symbols).
Data transmitted on the physical channel is transmitted in a Frame (Frame) format. Each frame includes a downlink subframe (DL subframe, abbreviated as DL in fig. 2) and an uplink subframe (UL subframe, abbreviated as UL in fig. 2). In TDD mode, a downlink subframe DL is transmitted first, followed by an uplink subframe UL. A burst may be allocated to an SS/MSS (or a group of users) on the uplink and may be sent by the BS as a sending unit to the SS/MSS on the downlink. The initial access Ranging, the periodic Ranging, the bandwidth request and the like of the uplink SS are all performed through Ranging subframe. The downlink subframe starts with a preamble for physical synchronization; followed by a Frame Control Header (FCH) specifying the profile of the one or more downstream bursts following the FCH and its length. Then, a downlink mapping table DL-MAP is used for indicating the sub-channel and OFDMA symbol position and usage method (profile) of each burst in the downlink, and an uplink mapping table (UL-MAP) is used for indicating the sub-channel and OFDMA symbol position and usage method (profile) of each burst in the uplink. In TDD systems, TTG and RTG are inserted when uplink and downlink subframes are alternated, to leave a time for the BS to complete the alternation of transceiving.
The 802.16OFDMA (or SOFDMA) frame structure in FDD is different from the 802.16OFDMA (or SOFDMA) frame structure in TDD in that an uplink subframe and a downlink subframe are transmitted on different frequencies without setting a TTG and an RTG.
The network coding technology was first proposed by the li Shuo Yan professor, and the network coding can be divided into linear network coding and convolutional network coding, and the specific principle can be seen in the IEEE paper: li, Yeung & Cai, "Linear network Coding," IEEE trans. info. Thy, Feb.2003.
As shown in fig. 3, in the prior art, FDD single carrier communication is adopted between the RS and the BS and between the MS/SS, the MS/SS performs wireless relay access to the BS through the RS, and the RS is used as an MS/SS access BS. DLBSFrom BS to SS/MS for downlink sub-frame of physical layer frame of BSBSOr RS, ULBSFor uplink sub-frame of physical layer frame of BS, by SS/MSBSOr RS to BS; DLRSDownlink subframe of physical layer frame for RS from BS to SS/MSRSOr RS, ULRSFor uplink sub-frame of physical layer frame of RS, by SS/MSRSOr RS to BS.
The base station and the subscriber station need 4 time slots for exchanging data packets through the relay station: slot 1, BS to RS; time slot 2, MS to RS; time slot 3, RS to MS; slot 4, RS to BS.
In the prior art, each transfer data needs to be sent twice, so that the throughput of a transfer system is low, the network capacity is limited, and the scale and the cost of the network are influenced.
In addition, in the FDD mode, there is a situation where the network system communication interferes with the base station, the relay station and the subscriber station.
Disclosure of Invention
An object of the present invention is to provide a relay communication system capable of maximizing a relay throughput, and a relay communication method employed by the system.
The invention relates to a wireless transfer communication system, which is an orthogonal frequency division multiplexing access wireless transfer communication system based on network coding and comprises a base station BS, a transfer station RS and a user terminal, wherein the RS carries out wireless communication with the BS and the user terminal in a Frequency Division Duplex (FDD) mode; the RS is respectively provided with interfaces for communicating with the BS and the user terminal, and comprises a frequency division duplex FDD wireless transceiver and a wireless link layer processing unit based on a network coding technology; the BS and the user terminal both comprise an FDD wireless transceiver and a wireless link layer processing unit based on a network decoding technology; the FDD wireless transceiver of the RS, BS and user terminal comprises an FDD wireless transmitter physical layer processing unit and an FDD wireless receiver physical layer processing unit; the FDD wireless transmitter physical layer processing unit of the RS corresponds to the BS and the FDD wireless receiver physical layer processing unit in the user terminal respectively; the FDD wireless receiver physical layer processing unit of the RS corresponds to the FDD transmitter physical layer processing unit in the BS and the user terminal respectively.
The invention relates to a wireless transfer communication method, which comprises the following steps:
A. respectively setting a downlink middle rotor channel and an uplink middle rotor channel in a downlink subframe and an uplink subframe of a BS physical layer frame structure, wherein the downlink middle rotor channel and the uplink middle rotor channel are respectively used for defining a BS downlink middle rotor channel and an OFDMA symbol combination transmitted to an RS by the BS, and the BS uplink middle rotor channel and the OFDMA symbol combination transmitted to the BS by the RS; setting a downlink middle rotor channel in an uplink subframe of an RS physical layer frame structure, wherein the downlink middle rotor channel is used for defining a middle rotor channel and an OFDMA symbol combination of the downlink middle rotor channel of an RS receiving BS, and setting an uplink middle rotor channel in the downlink subframe of the RS physical layer frame structure, and the uplink middle rotor channel is used for defining an uplink middle rotor channel and an OFDMA symbol combination of the RS receiving BS;
B. and performing OFDMA wireless relay communication between the BS, the RS and the user terminal by adopting an FDD mode based on the uplink and downlink physical layer frames of the BS and the RS.
The invention increases the throughput of the transit system to the maximum extent by introducing the mechanism of combining the OFDMA (or OFDM subchannel) technology and the network coding technology, theoretically, the throughput can be increased by 25 percent, and the defects of the prior art are effectively improved.
The invention effectively supports the OFDMA (or OFDM subchannel) wireless relay function based on the OFDMA (or OFDM subchannel) physical layer frame structure defined by the characteristics of the network coding technology, namely MS/SS can perform wireless relay access to BS through RS.
Can avoid RS to SS/MS in the prior artBS"," BS to SS/MSRS”、“SS/MSBSTo RS "," SS/MSRSSelf-interference to BS "and RS to RS"; can avoid RS to SS/MSRS"interference; can avoid' SS/MSBSTo BS "," SS/MSRSTo RS "," SS/MSRSTo SS/MSBS”、“SS/MSBSTo SS/MSRS"interference.
Drawings
Fig. 1 illustrates an OFDMA symbol subcarrier adjacency situation.
Fig. 2 is a diagram illustrating an 802.16OFDMA (or SOFDMA) frame structure based on TDD.
Fig. 3 is a schematic diagram of a relay mode of a conventional wireless relay communication system.
Fig. 4 shows an OFDM (or OFDMA) advanced transit system based on a network coding technique according to the present invention.
Fig. 5 illustrates an OFDM (or OFDMA) simplified relay system based on a network coding technique according to the present invention.
Fig. 6 is a schematic diagram of co-channel interference pattern of network system communication based on FDD.
Fig. 7 is a schematic structural diagram of a transit system based on network coding according to the present invention.
Fig. 8 is a diagram illustrating a physical layer frame structure of a BS and an RS in an advanced relay mode according to the present invention.
Fig. 9 is a diagram of a simplified physical layer frame structure of a relay mode BS and RS according to the present invention.
Detailed Description
As shown in fig. 4, the present invention is based on an OFDM (or OFDMA) advanced transit system model of a network coding technique. The RS, the BS and the MS/SS communicate in an FDD/OFDMA (or OFDM subchannel) mode, the BS downlink and the RS uplink adopt a frequency f1, the BS uplink and the RS downlink adopt a frequency f2, and the RS only needs one set of FDD wireless transceiver. The MS/SS performs wireless relay access to the BS through the RS, and the RS is used as the MS/SS access BS. DLBSFrom BS to SS/MS for downlink sub-frame of physical layer frame of BSBSOr RS, ULBSFor uplink sub-frame of physical layer frame of BS, by SS/MSBSOr RS to BS; DLRSDownlink subframe of physical layer frame for RS from BS to SS/MSRSOr RS, ULRSFor uplink sub-frame of physical layer frame of RS, by SS/MSRSOr RS to BS.
Only 2 time slots are needed for the base station and the subscriber station to exchange data packets through the transfer station: in the time slot 1, a packet A of the BS and a packet B of the MS are respectively sent to the RS through different OFDM sub-channels, the BS caches the packet A, and the MS caches the packet B; the RS carries out network coding on the packet A of the BS and the packet B of the MS, for example, the network coding is obtained by directly carrying out XOR operation according to bitsAt time slot 2, the RS will complete the network coded packetBroadcasting and sending to BS and MS; BS performs network decoding to buffer packet A and network coded packetBy XOR processing to obtain packet B of MS, i.e. <math> <mrow> <mi>A</mi> <mo>&CirclePlus;</mo> <mrow> <mo>(</mo> <mi>A</mi> <mo>&CirclePlus;</mo> <mi>B</mi> <mo>)</mo> </mrow> <mo>=</mo> <mi>B</mi> <mo>;</mo> </mrow></math> MS decodes the network, and combines the buffer packet B with the network coded packetBy performing an XOR operation to obtain packet A of BS, i.e. <math> <mrow> <mi>B</mi> <mo>&CirclePlus;</mo> <mrow> <mo>(</mo> <mi>A</mi> <mo>&CirclePlus;</mo> <mi>B</mi> <mo>)</mo> </mrow> <mo>=</mo> <mi>A</mi> <mo>.</mo> </mrow></math>
The simplified relay mode of communication of the RS and BS, MS/SS of the present invention is shown in FIG. 5. Wherein, the downlink Broadcast Burst (Broadcast Burst) of DLBS, such as Preamble, FCH, DL-MAP, UL-MAP, is directly sent to MS/SS by BS without RS transfer; the initial access Ranging, the periodic Ranging and the bandwidth request of the MS/SS are directly sent to the BS by the MS/SS through a Ranging subchannel Ranging and subchannel of the ULBS without being transferred through an RS; for other downlink bursts of the DLBS, such as data messages or message messages except DL-MAP and UL-MAP, the data messages or the message messages can not be directly sent to the MS/SS by the BS, and the data messages or the message messages must be transferred through the RS; the uplink other bursts of the ULBS, such as the initial access Ranging, the periodic Ranging and the bandwidth request message except the MS/SS, can not be directly transmitted to the BS by the MS/SS, and the uplink other bursts need to be transferred through the RS.
Fig. 7 shows a transit communication system based on network coding according to the present invention. Wherein,
the base station includes:
transmission processing unit (wired transmission processing unit in the figure): the communication can be established with the upper-level equipment (such as a base station controller) or with a group of base station equipment respectively, and the information interaction is carried out between the communication and the upper-level equipment or each base station equipment;
FDD radio transceiver: the system is used for carrying out wireless communication with an RS or SS/MS in an FDD mode and comprises an FDD wireless transmitter physical layer processing unit, an FDD wireless receiver physical layer processing unit and a wireless data link layer processing unit.
FDD radio transmitter physical layer processing unit (frequency f 1): in the physical layer processing unit or RS of FDD radio receiver 1 in SS/MS respectively communicating with the radio data link layer and with itThe physical layer processing unit of the FDD wireless receiver carries out wireless communication; for the simplified transit mode, this unit is paired with DLBSThe downlink sub frame head broadcast (such as Preamble, FCH, DL-MAP, UL-MAP) adopts a channel coding and modulation mode (such as binary phase shift keying BPSK) with higher reliability than other sending data, or adopts higher transmitting power than other sending data, and the downlink sub frame head broadcast is directly sent to MS/SS by the BS without being transferred by the RS;
FDD radio receiver physical layer processing unit (frequency f 2): respectively carrying out wireless communication with a wireless data link layer and a processing unit of a physical layer of an FDD wireless transmitter 1 in an SS/MS or a processing unit of a physical layer of an FDD wireless transmitter in an RS, wherein the processing unit can be communicated with the wireless data link layer;
the wireless data link layer processing unit: the data from the FDD wireless receiver physical layer processing unit is forwarded to the wired transmission processing unit after the data receiving processing and the network decoding of a wireless data link layer are carried out; the data from the wire transmission processing unit is transmitted to the FDD wireless transmitter physical layer processing unit after being processed by the wireless data link layer.
The subscriber station includes:
FDD radio transceivers 1 and 2: the system is used for carrying out wireless communication with a BS or an RS in an FDD mode and comprises a physical layer processing unit of an FDD wireless transmitter 1 and 2, a physical layer processing unit of an FDD wireless receiver 1 and 2 and a wireless data link layer processing unit of the FDD wireless transceiver 1 and 2.
FDD radio transmitter 1 physical layer processing unit (frequency f 2): respectively carrying out wireless communication with FDD wireless transceivers 1 and 2 data link layers and FDD wireless receiver physical layer processing units in a BS which can communicate with the FDD wireless transceivers; for the reduced transit mode, the unit is paired with ULBSUplink random access (RandomAccess) slot (or Contention slot), such as initial Ranging Contention slot and bandwidth request Contention slot, or initial access Ranging, periodic Ranging and bandwidth request of MS/SS via ULBSThe Ranging Subchannel Ranging is used for transmitting more than other signalsAccording to a channel coding and modulation mode (such as binary phase shift keying BPSK) with higher reliability or by adopting higher transmission power than other transmission data, the data is directly transmitted to the BS by the MS/SS without being transferred by the RS;
FDD radio transmitter 2 physical layer processing unit (frequency f 1): respectively carrying out wireless communication with FDD wireless transceivers 1 and 2 data link layers and an FDD wireless receiver physical layer processing unit in an RS which can be communicated with the FDD wireless transceivers;
FDD radio receiver 1 physical layer processing unit (frequency f 1): respectively carrying out wireless communication with a wireless data link layer and a physical layer processing unit of an FDD wireless transmitter in a BS which can communicate with the wireless data link layer;
FDD radio receiver 2 physical layer processing unit (frequency f 2): respectively carrying out wireless communication with a wireless data link layer and a wireless transmitter physical layer processing unit in an RS which can be communicated with the wireless data link layer;
the wireless data link layer processing unit: the data from the FDD wireless receiver 1 and/or 2 physical layer processing unit is forwarded to the user after the data receiving processing and network decoding of a wireless data link layer are carried out; after data from the user is processed by the wireless data link layer, the data is forwarded to the FDD wireless transmitter 1 and/or 2 physical layer processing unit.
The transfer station includes:
FDD radio transceiver: the system is used for carrying out wireless communication with an SS/MS or a BS in an FDD mode and comprises an FDD wireless transmitter physical layer processing unit, an FDD wireless receiver physical layer processing unit and a wireless data link layer processing unit.
FDD wireless transmitter physical layer processing unit: respectively carrying out wireless communication with a wireless data link layer and an FDD wireless receiver 2 physical layer processing unit or a BS FDD wireless receiver physical layer processing unit in an SS/MS which can be communicated with the wireless data link layer;
FDD wireless receiver physical layer processing unit: respectively carrying out wireless communication with a wireless data link layer and an FDD wireless transmitter 2 physical layer processing unit in an SS/MS or an FDD wireless transmitter physical layer processing unit in a BS which can be communicated with the wireless data link layer;
the wireless data link layer processing unit: the data from the FDD wireless receiver physical layer processing unit is forwarded to the FDD wireless transmitter physical layer processing unit after the data receiving processing, the network coding and the sending processing of a wireless data link layer are carried out on the data.
In the physical layer frame structure of the BS and RS of the simplified relay mode of the present invention as shown in fig. 8:
downlink subframe (DL) of frequency f1 in physical layer frame structure of BSBS) In (1), define "DL RelaySubchannel" for defining BS downlink midamble channel and OFDMA symbol combination transmitted to RS by BS; for the case of multiple RSs, different downlink intermediate rotor channels are defined for different RSs;
uplink subframe (UL) of frequency f1 in physical layer frame structure of RSRS) In (2), define "DL RelaySubchannel", for defining the middle rotor channel and OFDMA symbol combination of DL RelaySubchannel of RS reception BS; for the condition of multiple RSs, different RSs only receive the relay data of the BS in the corresponding downlink intermediate sub-channel, and other sub-channels do not arrange for relay reception;
uplink subframe (UL) of frequency f2 in physical layer frame structure of BSBS) In (3), define "UL RelaySubchannel" for defining BS uplink middle rotor channel and OFDMA symbol combination passed to BS by RS; for the case of multiple RSs, different uplink intermediate rotor channels are defined for different RSs;
downlink subframe (DL) with frequency f2 in RS physical layer frame structureRS) The TDM technology is adopted in the process, and an UL Relay Subchannel (uplink intermediate channel) is added, and is used for defining the intermediate channel and OFDMA symbol combination of the UL Relay Subchannel of the RS receiving BS; for the case of multiple RSs, different RSs only send the relay data of the BS in the corresponding uplink intermediate sub-channel, and other sub-channels cannot be arranged to forwardFeeding;
SS/MS during BS UL Relay subframeBSAvoiding SS/MS without arranging any transmission sub-channel and OFDMA symbol combinationBSInterference to the BS "; SS/MS during BS DL Relay subframeRSAvoiding SS/MS without arranging any transmission sub-channel and OFDMA symbol combinationRSInterference to RS ";
uplink subframe (UL) of frequency f2 in physical layer frame structure of BSBS) Defining a Relay Ranging Subchannel (RRS), and defining a BS relay Ranging reception Subchannel and an OFDMA symbol combination for initial access Ranging, periodic Ranging, and bandwidth request of the RS; the relay ranging sub-channel RRS can also be used as SS/MSBSThe initial access Ranging, the periodic Ranging, and the bandwidth request Ranging sub-channel. Downlink subframe (DL) with frequency f2 in RS physical layer frame structureRS) "Relay Ranging TX Ranging transmission sub-channel (abbreviated RRS TX)" is defined in (1), and is used to define an RS initial access Ranging, periodic Ranging, an RS Relay Ranging transmission sub-channel of a bandwidth request, and an OFDMA symbol combination. The time-frequency relationship of the Relay Ranging Subchannel of the BS and the Relay Ranging TX Subchannel of the RS must be in one-to-one correspondence and strictly synchronous.
In a downlink subframe of a BS physical layer frame structure or an uplink subframe of an RS physical layer frame structure, except for DLHeader, DL Header RX, RRS and DL Relay subframe, a BS transmitter and different RS receivers share the rest of the BS downlink subframe or RSRx uplink subframe through different Subchannel and OFDMA symbol combinations to respectively share with SS/MSBSAnd SS/MSRSCommunication, avoidance of' SS/MSRSTo SS/MSBS"interference.
In an uplink subframe of a BS physical layer frame structure or a downlink subframe of an RS physical layer frame structure, except for corresponding periods of DLHeader, Ranging Subchannel, RRS TX and UL Relay Subchannel, a BS receiver and different RS transmitters pass through different subchannels and OFDMThe A symbol combination shares the rest of the RS downlink subframe or the BS uplink subframe to the SS/MS, respectivelyBSAnd SS/MSRSCommunication, avoidance of' SS/MSBSTo SS/MSRS"interference.
Downlink subframe (DL) of frequency f1 in physical layer frame structure of BSBS) Defining "DL Header" as the beginning of the downlink subframe, and defining the combination of the sub-channel and OFDMA symbol for transmitting the user synchronization information and the combination of the sub-channel and OFDMA symbol for transmitting the indication information to indicate the position and usage profile of each combination of the sub-channel and OFDMA symbol of the downlink subframe and uplink subframe of the BS physical layer frame structure. Including preamble, FCH, DL-MAP, UL-MAP, SS/MS in the original 802.16OFDMA (or SOFDMA) frameBSThe RS and the BS maintain transceiving frame synchronization. Uplink subframe (UL) of frequency f1 in physical layer frame structure of RSRS) "DL Header RX (downlink subframe Header reception)" is defined for defining a subchannel and OFDMA symbol combination of 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 in one-to-one correspondence and strictly synchronous.
Uplink subframe (UL) of frequency f2 in physical layer frame structure of BSBS) "ranging subchannel" is defined in (1), and is defined for SS/MSBSInitial access Ranging, periodic Ranging, BS Ranging reception subchannel for bandwidth request, and OFDMA symbol combination.
As shown in fig. 9, the physical layer frame structures of the BS and the RS in the advanced relay mode of the present invention further include a downlink sub-frame (DL) with a frequency f2 in the physical layer frame structure of the RSRS) Defining "DL Header" as the beginning of the downlink sub-frame, and defining the combination of the sub-channel and OFDMA symbol for transmitting the user synchronization information and the combination of the sub-channel and OFDMA symbol for transmitting the indication information to indicate the position and usage profile of each combination of the sub-channel and OFDMA symbol of the RS physical layer frame structure downlink sub-frame and uplink sub-frame. Including preamble, FCH, DL-MAP, UL-MAP, SS/MS in the original 802.16OFDMA (or SOFDMA) frameRSAnd the RS maintains the transceiving frame synchronization.
An uplink subframe (UL) of the BS during DL Header of the RSBS) Avoiding SS/MS without arranging any receiving sub-channel and OFDMA symbol combinationBSTo SS/MSRS"interference.
During DL Header of RS, downlink sub-frame (DL) of physical layer frame structure of other RSRS) Cannot arrange any transmission subchannel and OFDMA symbol combination to avoid RS to SS/MSRS"interference; alternatively, if the DL headers of different RSs overlap in time, they must be completely overlapped, strictly synchronized, and their contents must be the same, avoiding "RS to SS/MSRS"interference.
Uplink subframe (UL) of frequency f1 in physical layer frame structure of RSRS) "Relay Ranging Subchannel (RRS)" is defined in (1), and is defined for SS/MSRSInitial access Ranging, periodic Ranging, RS Ranging reception subchannel of bandwidth request, and OFDMA symbol combination.
The "NULL" in fig. 8 and 9 is a portion where any reception or transmission is not scheduled. Wherein, BS downlink sub-frame (DL)BS) And RS downlink subframe (DL)RS) The "white area" in (1) is a DL Header; RS uplink subframe (UL)RS) The "white area" in (1) is DL Header RX.
The transfer communication flow based on the physical layer frame structure and the relay system comprises the following steps:
first stage (base station to relay):
s1, base station downlink sub-frame (DL) with frequency f1BS) Sending a preamble by a first symbol or time slot in the 'DL Header';
s2, the transfer station passes through a transfer station uplink subframe (UL) with the frequency f1RS) Middle 'DL Header RX' receives base station downlink sub-frame (DL)BS) The preamble in the 'DL Header' is synchronized with the BS;
s3. base stationDownlink subframe (DL) at frequency f1BS) After the 'DL Header' preamble, FCH, DL-MAP and UL-MAP are sent;
s4, the transfer station passes through the uplink sub-frame (UL) of the transfer station with the frequency f1RS) Medium "DL Header RX" receives downlink sub-frame (DL)BS) FCH, DL-MAP and UL-MAP of 'DL Header', and obtaining time slot, sub-channel and/or OFDMA symbol position and use method (profile) information of each burst of downlink and uplink of the base station;
s5, the base station carries out downlink sub-frame (DL) with frequency f1BS) The DL Relay subframe in the network sends downlink Relay communication data A to the Relay station; the base station caches data A;
s6, the transfer station passes through the uplink sub-frame (UL) of the transfer station with the frequency f1RS) The middle "DL RelaySubchannel" receives the downlink relay communication data a sent by the base station in S5.
Second phase (subscriber station to transfer station):
s1. Relay downlink subframe (DL) at frequency f2RS) Sending a preamble by a first symbol or time slot in the 'DL Header';
s2, receiving a downlink subframe (DL) of a transfer station with the frequency f2 by a subscriber stationRS) The preamble in the 'DL Header' is synchronized with the repeater;
s3, the relay station transmits a downlink subframe (DL) with the frequency of f2RS) After the 'DL Header' preamble, FCH, DL-MAP and UL-MAP are sent;
s4, receiving a downlink subframe (DL) of a transfer station with the frequency f2 by a subscriber stationRS) FCH, DL-MAP and UL-MAP of 'DL Header', obtaining sub-channel and OFDMA symbol position and use method (profile) information of each burst of downlink and uplink of the transfer station:
s5, subscriber station uplink sub-frame (UL) in transfer station with frequency f1RS) In the OFDM subframe except DL Header RX, RRS and UL Relay subframe, the uplink communication number is transmittedB, the transfer station is provided; the user station caches the data B;
s6, the transfer station receives the uplink communication data B sent by the user station in the step S5 from the corresponding OFDM Subchannel with the frequency of f 1:
the "DL Relay subframe" in the first stage S6 and the OFDM subframe in the second stage step S6 may be selected in the same uplink subframe of the Relay station, so as to reduce the Relay delay.
Stage three (network coding):
s1, the transfer station makes network coding for the data A of the base station and the data B of the user station to obtain the coded data C, for example, directly makes XOR operation according to bits, then <math> <mrow> <mi>C</mi> <mo>=</mo> <mi>A</mi> <mo>&CirclePlus;</mo> <mi>B</mi> </mrow></math>
Fourth stage (transit to base station and subscriber station):
s1, the relay station transmits a downlink subframe (DL) with the frequency f2RS) Sending a preamble by a first symbol or time slot in the 'DL Header';
s2, receiving a downlink subframe (DL) of a transfer station with the frequency f2 by a subscriber stationRS) The preamble in the 'DL Header' is synchronized with the repeater;
s3, the relay station transmits a downlink subframe (DL) with the frequency of f2RS) Transmitting FCH, DL-MAP and UL-MAP after the preamble of the DdL header; the Relay station particularly indicates the Relay destination subscriber station of the base station to receive data in UL Relay subframe in DL MAP;
s4, receiving a downlink subframe (DL) with frequency f2 by the subscriber stationRS) FCH, DL-MAP and UL-MAP of 'DL Header' obtain time slot, sub-channel and/or OFDMA symbol position and use method (profile) information of each burst of the downlink and uplink of the transfer station;
s5, transferring the transfer station at the frequency f2Station downlink subframe (DL)RS) Sending the data C after network coding to a base station and transferring in the UL RelaySubchannel;
s6, the target user station receives the network coded data C transmitted by the Relay station from the UL Relay Subchanel with the frequency of f2 in the step S5 according to the indication of the Relay station in the DL MAP, and the BS receives the network coded data C transmitted by the Relay station from the UL Relay Subchanel with the frequency of f2 in the step S5;
fifth stage (network decoding):
s1, the target user station carries out network decoding on the cached data B and the received network coded data C to obtain data A transferred by the base station through the transfer station, for example, the data B cached by the target user station and the network coded data areThe XOR operation is performed to obtain the data A of the base station, i.e. <math> <mrow> <mi>B</mi> <mo>&CirclePlus;</mo> <mrow> <mo>(</mo> <mi>A</mi> <mo>&CirclePlus;</mo> <mi>B</mi> <mo>)</mo> </mrow> <mo>=</mo> <mi>A</mi> <mo>;</mo> </mrow></math>
S2, the base station carries out network decoding on the cached data A and the received network coding data C to obtain data B transferred by the subscriber station through the transfer station, for example, the data A cached by the base station and the network coding data areBy performing an XOR operation to obtain the relayed data B, i.e. <math> <mrow> <mi>A</mi> <mo>&CirclePlus;</mo> <mrow> <mo>(</mo> <mi>A</mi> <mo>&CirclePlus;</mo> <mi>B</mi> <mo>)</mo> </mrow> <mo>=</mo> <mi>B</mi> <mo>.</mo> </mrow></math>
Wherein, step S1 and step S2 have no dependency relationship.
In summary, the present invention defines the physical layer frame structure of the BS and the RS by introducing the mechanisms of OFDMA (or OFDM subchannel) technology and network coding technology, so as to increase the throughput of the wireless relay communication system to the maximum extent and effectively avoid various possible interferences.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (32)

1. A wireless relay communication system, characterized in that:
the system comprises a base station, a transfer station and a user terminal, wherein the transfer station carries out wireless communication with the base station and the user terminal in a frequency division duplex mode;
the transfer station is provided with interfaces for communicating with the base station and the user terminal respectively, and comprises a frequency division duplex wireless transceiver and a wireless link layer processing unit based on a network coding technology;
the base station and the user terminal both comprise a frequency division duplex wireless transceiver and a wireless link layer processing unit based on a network decoding technology;
the frequency division duplex wireless transceiver of the transfer station, the base station and the user terminal comprises a physical layer processing unit of the frequency division duplex wireless transmitter and a physical layer processing unit of the frequency division duplex wireless receiver;
the physical layer processing unit of the frequency division duplex wireless transmitter of the transfer station respectively corresponds to the physical layer processing units of the frequency division duplex wireless receiver in the base station and the user terminal; the physical layer processing unit of the frequency division duplex wireless receiver of the transfer station respectively corresponds to the physical layer processing units of the frequency division duplex transmitter in the base station and the user terminal;
the downlink broadcast burst of the downlink base station is directly sent to the user terminal by the base station without being transferred by a transfer station, wherein the downlink broadcast burst of the downlink base station comprises: a preamble, a frame control header, a downlink mapping table and an uplink mapping table; the initial access ranging, the periodic ranging and the bandwidth request of the user terminal are directly sent to the base station by the ranging subchannel of the uplink base station without being transferred by a transfer station; the message messages except the lead code, the frame control head, the downlink mapping table and the uplink mapping table in the downlink burst of the downlink base station need to be transferred through a transfer station; the messages in the uplink burst of the uplink base station, except for the initial access ranging, the periodic ranging, and the bandwidth request of the ue, must be transferred through the relay station.
2. The system of claim 1, wherein: the processing unit of the physical layer of the frequency division duplex wireless transmitter and the processing unit of the physical layer of the frequency division duplex wireless receiver of the base station respectively correspond to the processing unit of the physical layer of the frequency division duplex wireless receiver and the processing unit of the physical layer of the frequency division duplex wireless transmitter of the user terminal.
3. The system according to claim 1 or 2, wherein the transfer station comprises:
a physical layer processing unit of the frequency division duplex wireless transmitter: carrying out wireless communication with the physical layer processing units of the frequency division duplex wireless receiver in the base station and the user terminal, and sending transfer data to the base station and the user terminal;
a physical layer processing unit of the frequency division duplex wireless receiver: carrying out wireless communication with the physical layer processing units of wireless transmitters in the base station and the user terminal, and receiving transfer data sent by the base station and the user terminal;
a radio link layer processing unit: the transfer data from the physical layer processing unit of the frequency division duplex wireless receiver is forwarded to the physical layer processing unit of the frequency division duplex wireless transmitter after data receiving processing, network coding and sending processing.
4. The system of claim 1, wherein the base station comprises:
a physical layer processing unit of the frequency division duplex wireless transmitter: receiving transfer data sent by a transfer station corresponding to a physical layer processing unit of a frequency division duplex wireless receiver of the transfer station and/or a user terminal;
a physical layer processing unit of the frequency division duplex wireless receiver: corresponding to the physical layer processing unit of the frequency division duplex wireless transmitter of the transfer station, transmitting transfer data to the transfer station;
a radio link layer processing unit: after data receiving processing and network decoding are carried out on the data from the physical layer processing unit of the frequency division duplex wireless receiver, the data are forwarded to the transmission processing unit; after data transmission processing is carried out on the data from the transmission processing unit, the data are forwarded to a physical layer processing unit of the frequency division duplex transmitter.
5. The system of claim 4, further comprising in the base station:
a transmission processing unit: and establishing communication with the upper-level equipment or respectively with a group of base station equipment, and carrying out information interaction.
6. The system of claim 5, wherein: the transmission processing unit is a wired transmission processing unit.
7. The system according to claim 1, wherein the user terminal comprises:
a physical layer processing unit of the frequency division duplex wireless transmitter: carrying out wireless communication with a physical layer processing unit of a frequency division duplex wireless receiver of the transfer station, and sending uplink transfer data to the transfer station;
a physical layer processing unit of the frequency division duplex wireless receiver: carrying out wireless communication with a physical layer processing unit of a frequency division duplex wireless transmitter of the transfer station, and receiving transfer data sent by the transfer station;
the wireless data link layer processing unit: after data receiving processing and network decoding are carried out on the data from the physical layer processing unit of the frequency division duplex wireless receiver, the data are forwarded to a user; after data transmission processing is carried out on data from a user, the data are forwarded to a physical layer processing unit of the frequency division duplex wireless transmitter.
8. The system of claim 2, wherein the user terminal comprises:
first and second frequency division duplex wireless transceivers: the system consists of a first frequency division duplex wireless receiver physical layer processing unit, a second frequency division duplex wireless transmitter physical layer processing unit and a wireless data link layer processing unit; wherein:
a first frequency division duplex wireless receiver physical layer processing unit: corresponding to a physical layer processing unit of a frequency division duplex wireless transmitter of a base station, receiving partial data sent by the base station;
the second frequency division duplex wireless receiver processes the physical layer elements: receiving transfer data sent by the transfer station corresponding to a frequency division duplex wireless transmission physical layer processing unit of the transfer station;
a first frequency division duplex wireless transmitter physical layer processing unit: corresponding to the physical layer processing unit of the frequency division duplex wireless receiver of the base station, sending partial data to the base station;
a second frequency division duplex wireless transmitter physical layer processing unit: corresponding to the physical layer processing unit of the frequency division duplex wireless receiver of the transfer station, transmitting transfer data to the transfer station;
the wireless data link layer processing unit: and after the data from the user is sent and processed, the data are forwarded to the physical layer processing unit of the first frequency division duplex wireless transmitter and/or the second frequency division duplex wireless transmitter.
9. The system of claim 2, wherein: the transfer station receives communication data at a first frequency and transmits the communication data at a second frequency; the base station and the user terminal receive the communication data of the relay station at the second frequency and transmit the communication data to the relay station at the first frequency.
10. The system of claim 9, wherein: the base station also provides an interface for communicating with the user terminal, when the base station directly communicates with the user terminal under the coverage of the transfer station, the user terminal sends communication data to the base station at the second frequency, and receives the communication data of the base station at the first frequency.
11. The system of any one of claims 1, 2, 4, or 9, wherein: the frequency division duplex wireless transceiver adopts an orthogonal frequency division multiplexing access mode for communication.
12. A wireless relay communication method, comprising:
A. a downlink middle rotor channel and an uplink middle rotor channel are respectively arranged in a downlink subframe and an uplink subframe of a base station physical layer frame structure and are respectively used for defining a base station downlink middle rotor channel and an orthogonal frequency division multiplexing access symbol combination transmitted to a transfer station by a base station and a base station uplink middle rotor channel and an orthogonal frequency division multiplexing access symbol combination transmitted to the base station by the transfer station; setting a downlink middle rotor channel in an uplink subframe of a physical layer frame structure of a transfer station, wherein the downlink middle rotor channel is used for defining a middle rotor channel and an orthogonal frequency division multiplexing access symbol combination of the downlink middle rotor channel of a receiving base station of the transfer station;
B. performing orthogonal frequency division multiplexing access wireless transfer communication between a base station, a transfer station and a user terminal by adopting a frequency division duplex mode based on uplink and downlink physical layer frames of the base station and the transfer station;
when the base station directly communicates with the user terminal under the coverage of the transfer station, the base station directly sends the lead code, the frame control head, the downlink mapping table and the uplink mapping table information to the user terminal from an interface communicated with the user terminal by adopting a channel coding and modulation mode or different transmission power different from other sending data, the initial ranging competition time slot and the bandwidth request competition time slot of the uplink subframe of the base station or the ranging sub-channel ranging is carried out, the user terminal directly sends the channel coding and modulation mode or different transmission power different from other sending data to the base station by the user terminal without transferring through the transfer station.
13. The method of claim 12, wherein step a further comprises: setting a relay ranging sub-channel in an uplink sub-frame of a base station physical layer frame structure, wherein the relay ranging sub-channel is used for defining a base station relay ranging receiving sub-channel and an orthogonal frequency division multiplexing access symbol combination which are used for initial access ranging, periodic ranging and bandwidth request of a relay station;
setting a transfer ranging sending sub-channel in a downlink sub-frame of a physical layer frame structure of a transfer station, wherein the transfer ranging sending sub-channel is used for defining initial access ranging, periodic ranging and bandwidth request of the transfer station and an orthogonal frequency division multiplexing access symbol combination;
and the time-frequency relationships of the transit ranging sub-channels arranged in the base station and the transit station are in one-to-one correspondence and synchronization.
14. The method of claim 13, wherein: the uplink relay ranging subchannel of the uplink subframe of the base station can also be used as the initial access ranging, periodic ranging and bandwidth request ranging subchannels of the user terminal.
15. The method of claim 12, wherein step a further comprises: setting a downlink sub-frame header in a downlink sub-frame of a physical layer frame structure of a base station, wherein the downlink sub-frame header is the beginning of the downlink sub-frame and is used for defining a sub-channel and orthogonal frequency division multiplexing access symbol combination for sending user synchronization information and a sub-channel and orthogonal frequency division multiplexing access symbol combination for sending indication information so as to indicate the position and the using method of each sub-channel and orthogonal frequency division multiplexing access symbol combination of the downlink sub-frame and the uplink sub-frame of the physical layer frame structure of the base station;
setting a downlink sub-frame header receiving in an uplink sub-frame of a physical layer frame structure of a transfer station, wherein the downlink sub-frame header receiving is used for defining a downlink sub-frame header sub-channel and an orthogonal frequency division multiplexing access symbol combination of the physical layer frame structure of a receiving base station;
the time-frequency relationship of the downlink sub-frame head of the base station physical layer frame structure and the downlink sub-frame head of the transfer station physical layer frame structure is one-to-one corresponding and synchronous.
16. The method of claim 15, wherein the downlink subframe header of the base station physical layer frame structure comprises: the preamble, the frame control head, the downlink mapping table and the uplink mapping table are used for keeping the synchronization of the receiving and sending frames of the user terminal, the transfer station and the base station which belong to the base station;
the frame structure of the physical layer of the transfer station comprises a downlink sub frame head, a lead code, a frame control head, a downlink mapping table and an uplink mapping table, so that the user terminal belonging to the transfer station and the transfer station keep frame receiving and sending synchronization.
17. The method of claim 12, wherein step a further comprises:
setting a ranging subchannel in an uplink subframe of a base station physical layer frame structure, wherein the ranging subchannel is used for defining the initial access ranging, the periodic ranging and the base station ranging receiving subchannel of a bandwidth request of a user terminal and an orthogonal frequency division multiplexing access symbol combination;
setting a relay ranging sub-channel in an uplink sub-frame of a relay station physical layer frame structure, wherein the relay station ranging sub-channel is used for defining initial access ranging, periodic ranging and bandwidth request of a user terminal, and receiving a sub-channel and an orthogonal frequency division multiplexing access symbol combination.
18. The method of claim 12, wherein step a further comprises:
and setting a downlink sub-frame header in a downlink sub-frame of a physical layer frame structure of the transfer station, wherein the downlink sub-frame header is the beginning of the downlink sub-frame and is used for defining a sub-channel and orthogonal frequency division multiplexing access symbol combination for sending user synchronization information and a sub-channel and orthogonal frequency division multiplexing access symbol combination for sending indication information so as to indicate the position and the using method of each sub-channel and orthogonal frequency division multiplexing access symbol combination of the downlink sub-frame and the uplink sub-frame of the transfer station.
19. The method of claim 12, wherein step a further comprises:
when at least two transfer stations exist, respectively setting different downlink intermediate channel and uplink intermediate channel in a base station physical layer frame structure aiming at the at least two transfer stations; the frequency division duplex wireless transmitters of different transfer stations only transmit the transfer data of the base station in corresponding uplink intermediate sub-channels, and the transfer data of the base station is not transmitted in other sub-channels; the frequency division duplex wireless receivers of different transfer stations only receive the transfer data of the base station in the corresponding downlink intermediate sub-channel, and the transfer data of the base station is not arranged to be received in other sub-channels.
20. The method according to any one of claims 12 to 19, wherein step B specifically comprises: and performing message interaction among the base station, the transfer station and the user terminal based on an uplink and downlink middle rotor channel, a transfer ranging sub-channel, a downlink sub-frame header and a downlink sub-frame header receiving and ranging sub-channel which are contained in uplink and downlink physical layer frames of the base station and the transfer station, so as to realize wireless transfer communication.
21. The method of claim 20, wherein step B further comprises:
during the uplink midamble of the base station, the user terminals belonging to the base station do not arrange any transmission subchannel and ofdm access symbol combination, and during the downlink midamble of the base station, the user terminals belonging to the relay station do not arrange any transmission subchannel and ofdm access symbol combination.
22. The method of claim 20, wherein step B further comprises:
in a downlink subframe of a base station physical layer frame structure or an uplink subframe of a transfer station physical layer frame structure, except corresponding periods of a downlink subframe header, a downlink subframe header receiving period, a transfer ranging subchannel and a downlink relay subchannel, a base station transmitter and different transfer station receivers share the rest of the uplink subframe of a base station downlink subframe or a transfer station receiving module through different subchannel and orthogonal frequency division multiplexing access symbol combinations so as to respectively communicate with a user terminal belonging to a base station and a user terminal belonging to a transfer station;
in the uplink subframe of the frame structure of the physical layer of the base station or the downlink subframe of the frame structure of the physical layer of the transfer station, except the corresponding periods of a header of the downlink subframe, a ranging subchannel, a transfer ranging sending subchannel and an uplink intermediate subchannel, a receiver of the base station and different transmitters of the transfer station share the rest of the downlink subframe or the uplink subframe of the transfer station through different subchannels and orthogonal frequency division multiplexing access symbol combinations so as to respectively communicate with the user terminal belonging to the base station and the user terminal belonging to the transfer station.
23. The method of claim 20, wherein step B comprises: during the head of the downlink sub-frame of the relay station, the uplink sub-frame of the base station does not arrange any receiving sub-channel and orthogonal frequency division multiplexing access symbol combination.
24. The method of claim 20, wherein step B comprises: during the head period of the downlink sub-frame of the transfer station, the downlink sub-frames of other transfer stations do not arrange any sending sub-channel and orthogonal frequency division multiplexing access symbol combination; or, if the downlink subframe headers of different relay stations overlap in time, the downlink subframe headers of different relay stations must completely overlap and synchronize in time, and their contents must be the same.
25. The method of claim 12, wherein: the frequency of the downlink subframe of the base station physical layer frame structure and the frequency of the uplink subframe of the transfer station physical layer frame structure are first frequencies, and the frequency of the uplink subframe of the base station physical layer frame structure and the frequency of the downlink subframe of the transfer station physical layer frame structure are second frequencies.
26. A wireless relay communication method, comprising:
A. the base station sends downlink transfer data to the transfer station in a downlink transfer channel of a downlink subframe of the base station in a frequency division duplex mode and buffers the data; the user terminal sends uplink transfer data to the transfer station in a frequency division duplex mode in an orthogonal frequency division multiplexing subchannel of an uplink subframe of the transfer station except a downlink subframe head receiving and transferring ranging subchannel and an uplink intermediate subchannel, and caches the data;
B. the transfer station performs network coding processing on the received downlink transfer data of the base station and the received uplink transfer data of the user terminal, and then simultaneously sends the downlink transfer data and the uplink transfer data of the user terminal to the base station and the user terminal in a frequency division duplex mode;
C. the base station and the user terminal perform network decoding processing on the cached data and the network-coded transfer data sent by the transfer station to respectively obtain uplink transfer data of the user terminal and downlink transfer data of the base station;
the downlink broadcast burst of the downlink base station is directly sent to the user terminal by the base station without being transferred by a transfer station, wherein the downlink broadcast burst of the downlink base station comprises: a preamble, a frame control header, a downlink mapping table and an uplink mapping table; the initial access ranging, the periodic ranging and the bandwidth request of the user terminal are directly sent to the base station by the ranging subchannel of the uplink base station without being transferred by a transfer station; the message messages except the lead code, the frame control head, the downlink mapping table and the uplink mapping table in the downlink burst of the downlink base station need to be transferred through a transfer station; the messages in the uplink burst of the uplink base station, except for the initial access ranging, the periodic ranging, and the bandwidth request of the ue, must be transferred through the relay station.
27. The method of claim 26, wherein step a comprises:
a1, the base station sends lead code in the head of the downlink sub-frame, the transfer station receives the lead code through the head receiving sub-channel of the downlink sub-frame of the uplink sub-frame of the transfer station, and the lead code and the base station are synchronized;
a2, after the base station sends the lead code in the downlink sub-frame, it sends the frame control head, downlink mapping table and uplink mapping table information, the transfer station receives the sub-channel through the downlink sub-frame head in the uplink sub-frame of the transfer station to receive the frame control head, downlink mapping table and uplink mapping table information, and obtains the time slot, sub-channel and/or orthogonal frequency division multiplexing access symbol combination position and use method information of each burst of the base station downlink and uplink;
a3, the base station sends the downlink relay data to the relay station in the downlink relay sub-frame, and buffers the data, the relay station receives the downlink relay data of the base station through the downlink relay sub-frame.
28. The method of claim 27, wherein step a further comprises:
a4, the transfer station sends lead code in the head of the downlink sub-frame of the transfer station, the user terminal receives the lead code and gets synchronization with the transfer station;
a5, the transfer station sends frame control head, downlink mapping table, uplink mapping table information in the downlink sub-frame of the transfer station, the user terminal receives the frame control head, downlink mapping table, uplink mapping table information, and obtains the sub-channel and OFDM access symbol combination position and usage method information of each burst of the downlink and uplink of the transfer station;
a6, the user terminal sends the uplink relay data to the relay station in the OFDM sub-channel of the uplink sub-frame of the relay station except the downlink sub-frame head receiving, the relay ranging sub-channel and the uplink relay sub-channel, and buffers the data, and the relay station receives the uplink relay data of the user terminal from the corresponding OFDM sub-channel.
29. The method of claim 28, wherein step a further comprises:
the corresponding OFDM sub-channel in a6 may be selected from the uplink sub-frame of the same relay station as the downlink midamble sub-channel in the uplink sub-frame in A3.
30. The method of claim 26, wherein step B comprises:
b1, the transfer station carries out network coding processing on the received downlink transfer data of the base station and the uplink transfer data of the user terminal to obtain coded transfer data;
b2, the transfer station sends a lead code in a head of a downlink sub-frame of the transfer station, and the user terminal receives the lead code and synchronizes with the transfer station;
b3, the transfer station sends frame control head, downlink mapping table, uplink mapping table information in the downlink sub-frame head of the downlink sub-frame of the transfer station, the user terminal receives the frame control head, downlink mapping table, uplink mapping table information, and obtains the time slot, sub-channel and/or orthogonal frequency division multiplexing access symbol combination position and using method information of each burst of the downlink and uplink of the transfer station;
b4, the relay station sends the coded relay data to the base station and the user terminal in the uplink middle sub-channel of the downlink sub-frame of the relay station, and the base station and the user terminal receive the coded relay data from the uplink middle sub-channel.
31. The method according to claim 30, wherein the step B1 specifically comprises:
the transfer station directly performs XOR operation processing on the data sent by the base station and the data sent by the user terminal according to bits to obtain the encoded data.
32. The method of claim 31, wherein step C comprises:
the user terminal performs XOR operation processing on the cached data and the received coded transit data sent by the transit station to obtain downlink data of the base station; and the base station performs XOR operation processing on the cached data and the received coded transit data sent by the transit station to obtain the uplink transit data of the user terminal.
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