CN101009512A - Wireless transfer communication OFDM access system and method - Google Patents

Wireless transfer communication OFDM access system and method Download PDF

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Publication number
CN101009512A
CN101009512A CNA2006100022218A CN200610002221A CN101009512A CN 101009512 A CN101009512 A CN 101009512A CN A2006100022218 A CNA2006100022218 A CN A2006100022218A CN 200610002221 A CN200610002221 A CN 200610002221A CN 101009512 A CN101009512 A CN 101009512A
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China
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ofdm
frame
data
physical layer
subchannel
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郑若滨
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CNA2006100022218A priority Critical patent/CN101009512A/en
Priority to PCT/CN2007/000221 priority patent/WO2007085182A1/en
Publication of CN101009512A publication Critical patent/CN101009512A/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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT

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

Abstract

The invention relates to a wireless transfer communication OFDM switch system and method, the system includes: BS (base station), RS (relay station) and user terminal. The method includes: the descending relay sub-channel and ascending relay sub-channel are set separately on the descending sub-frame and ascending sub-frame of physical layer frame structure of BS; the descending relay sub-channel is set on the ascending sub-frame of physical layer frame structure of RS, the ascending relay sub-channel is set on the descending sub-frame of physical layer frame structure of RS; and the wireless relay communication is done between the BS, RS, and user terminal based on the said ascending and descending physical frame of BS and RS by the OFDM mode. The invention can increase the throughput of wireless relay communication system farthest, and avoid the disturbance effectively.

Description

Wireless transfer communication OFDM access system and method
Technical field
The present invention relates to wireless communication technology field, relate in particular to a kind of wireless transfer communication OFDM (OFDM) connecting system and method.
Background technology
IEEE 802.16 is first broadband wireless access standard, and this standard mainly comprises two versions: one is the broadband fixed wireless access version 802.16-2004 of 802.16 standards, and another is the broadband mobile wireless access version 802.16e of 802.16 standards.In the 802.16-2004 standard, only define two kinds of network elements, be specially BS (base station) and SS (subscriber station); In the 802.16e standard, equally also only define two kinds of network elements, be specially BS and MS (mobile subscriber station).
Present 802.16 Multihop Relay SG (802.16 multi-hop transfer seminar) have only proposed the notion of the RS (terminal) of WiMAX (micro-wave access to global intercommunication), the important effect of described RS is as the transfer communication entity between BS and SS/MS, thereby enlarges the coverage of BS or the throughput of increase subscriber station.
In addition, at present, in communication system, communicate as adopting OFDM (OFDM) or OFDMA (OFDM access) technology in 802.16 systems usually.In a channel (Channel) of OFDM or OFDMA system, its OFDM or OFDMA symbol are made of subcarrier (Subcarrier), and the number of subcarrier has determined counting of FFT conversion.The subcarrier of forming a subchannel (Subchannel) can be adjacent, also can be non-conterminous, and Fig. 1 has provided the adjacent example of subcarrier.
In communication system, subcarrier can be divided into following several by the kind that transmits data:
1, data subcarrier: the subcarrier that is used to pass data;
2, pilot sub-carrier: be used to conduct subcarrier frequently;
3, gap carrier wave: be not used in the subcarrier that passes any number, comprise boundary belt (Guard Band) and direct current subcarrier (DC Subcarrier).
In OFDM or OFDMA system, different users divides the FFT of up link (fast Fourier transform) space, and each user is transmitted on one or more subchannels.The division of subchannel is a kind of FDMA mode, and all effective subcarriers are divided into some sub-carrier set, and each sub-carrier set is called a subchannel (subchannel).
In dividing the subchannel process, mainly adopt following three kinds of methods:
First kind is that carrier wave is divided into continuous group, this implement the simplest, and adjacent sub-channel disturb less, but the effect of the frequency diversity that acquires is relatively poor.
Second kind is that the carrier wave of different subchannels interweaves in the mode of rule, and this frequency diversity effect is better, but system's antithetical phrase interchannel interference is comparatively responsive.
The third is the improvement to second kind, and promptly the carrier wave of different subchannels interweaves in pseudorandom mode, has reduced interference between the base station thereby use different sequences to change sign indicating number by different base station.
In 802.16 standards, for authorizing frequency range, duplex mode can be OFDM (Frequency Division Duplexing (FDD)) and TDD (time division duplex), and the SS of FDD mode (subscriber station) can be half-duplex FDD.And for the frequency range of exempting to authorize, duplex mode can only be TDD.And for the frequency range of exempting to authorize, duplex mode can only be TDD.802.16 OFDMA (or SOFDMA) frame structure under the FDD, as shown in Figure 2.In 802.16 OFDMA (or SOFDMA) mode, the PHYburst (burst) among the OFDMA (or SOFDMA) has been assigned with one group of adjacent subchannel and one group of OFDMA symbol.
The data of transmitting on physical channel are that the form with frame transmits.Every frame comprises DL (descending sub frame) and UL (sub-frame of uplink).Under tdd mode, DL is transmission earlier, transmits UL subsequently again.
A burst can distribute to a SS/MS (or one group of user) up, can issue SS/MS as a transmitting element by BS descending.Initial access range finding Ranging, the Perodic ranging Ranging of up SS, bandwidth request etc. are all undertaken by Ranging subchannel.Descending sub frame has a lead code (preamble) beginning, and it is synchronous to be used for physics; Be FCH afterwards, be used for specifying the profile and the length thereof that follow the one or more descending Burst after FCH closely.Be DL-MAP and UL-MAP message then, DL-MAP is used for subchannel and OFDMA character position and the using method (profile) of each burst of indicating downlink, and UL-MAP is used to indicate subchannel and OFDMA character position and the using method (profile) of up each burst.
In the TDD system, TTG (transmission/reception change gap) and RTG (reception/transmission change gap) can be inserted in ascending-descending subframes when replacing, and allow BS finish transmitting-receiving alternately to reserve a period of time.
802.16 OFDMA (or SOFDMA) frame structure under the FDD and 802.16OFDMA (or SOFDMA) the frame structure difference under the TDD are that sub-frame of uplink sends on different frequencies with descending sub frame, need not to be provided with TTG and RTG.
Network coding technique is proposed by professor Li Shuoyan the earliest, and network code can be divided into linear network encoding and convolution network code.
The transfer pattern diagram of existing wireless transfer communication system as shown in Figure 3, BS and MS need 4 time slots by the RS exchange data packets: time slot 1, BS-〉RS; Time slot 2, RS-〉MS; Time slot 3, MS-〉RS; Time slot 4, RS-〉BS.
The shortcoming of the transfer pattern of above-mentioned prior art is:
Each interim data bag all will send twice, and the throughput of transfer system is lower, and the network capacity of transfer system is limited, has influenced the scale and the cost of the network of transfer system.
Summary of the invention
The purpose of this invention is to provide a kind of wireless transfer communication OFDM connecting system and method, thereby can farthest increase the throughput of wireless transfer communication system, and can avoid the various interference that may exist effectively.
The objective of the invention is to be achieved through the following technical solutions:
A kind of wireless transfer communication OFDM access system, comprise base station BS, terminal RS and user terminal, this RS provides the interface with BS and user terminal communication respectively, and the OFDM data link layer deals unit that in this RS, comprises an orthogonal frequency division multiplex OFDM transceiver and coding techniques Network Based, OFDM transceiver among the RS carries out radio communication in the OFDM mode with BS and user terminal, and OFDM transmitting set physical layer element that the OFDM transceiver among the RS comprises and OFDM wireless receiver physical location are corresponding with OFDM wireless receiver physical layer element and OFDM transmitting set physical layer element in BS and the user terminal respectively.
Described user terminal comprises:
OFDM transmitting set physical layer processing unit: carry out the OFDM radio communication with OFDM transceiver data link layer and the RS that can communicate with or BS wireless receiver physical layer processing unit respectively;
OFDM wireless receiver physical layer processing unit: respectively with OFDM transceiver data link layer and RS that can communicate with or BS in the transmitting set physical layer processing unit carry out the OFDM radio communication;
OFDM data link layer deals unit: to data from OFDM wireless receiver physical layer processing unit, the Data Receiving of making OFDM transceiver data link layer handle and network decoding after, be transmitted to the user; To from user's data, make the data sending processing of OFDM transceiver data link layer after, be transmitted to OFDM transmitting set physical layer processing unit.
Described RS comprises:
OFDM transmitting set physical layer processing unit: respectively with OFDM transceiver data link layer and BS that can communicate with or user terminal in the wireless receiver physical layer processing unit carry out the OFDM radio communication;
OFDM wireless receiver physical layer processing unit: respectively with OFDM transceiver data link layer and BS that can communicate with or user terminal in the transmitting set physical layer processing unit carry out the OFDM radio communication.
OFDM data link layer deals unit: to data from OFDM wireless receiver physical layer processing unit, after doing Data Receiving processing, network code and the transmission processing of OFDM transceiver data link layer, be transmitted to OFDM transmitting set physical layer processing unit.
Described BS comprises:
The wire transmission processing unit: can be with upper level equipment or set up with one group of base station equipment respectively and communicate by letter, and and upper level equipment or each base station equipment between carry out information alternately;
OFDM transmitting set physical layer processing unit: respectively with OFDM transceiver data link layer and RS that can communicate with or user terminal in OFDM wireless receiver physical layer processing unit carry out the OFDM radio communication;
OFDM wireless receiver physical layer processing unit: respectively with OFDM transceiver data link layer and RS that can communicate with or user terminal in OFDM transmitting set physical layer processing unit carry out the OFDM radio communication;
OFDM data link layer deals unit: to data from OFDM wireless receiver physical layer processing unit, the Data Receiving of making OFDM transceiver data link layer handle and network decoding after, be transmitted to the wire transmission processing unit; To data from the wire transmission processing unit, make the data sending processing of OFDM transceiver data link layer after, be transmitted to OFDM transmitting set physical layer processing unit.
A kind of method of the realization wireless transfer communication based on said system comprises step:
A, in the descending sub frame of BS physical layer frame structure and sub-frame of uplink, descending rotor channel and up rotor channel are set respectively, are used to define by BS and pass to descending rotor channel of BS and the OFDMA symbol combination of RS and pass to up rotor channel of BS and the OFDMA symbol combination of BS by RS; In the sub-frame of uplink of the physical layer frame structure of RS, descending rotor channel is set, be used to define rotor channel and the OFDMA symbol combination that RS receives the descending transfer district of BS, in the descending sub frame of the physical layer frame structure of RS, up rotor channel is set, is used to define rotor channel and the OFDMA symbol combination that RS receives the up transfer district of BS;
B, the uplink and downlink physical layer frame based on the BS of described setting and RS between BS, RS and user terminal adopt the OFDM mode to carry out wireless transfer communication.
Described steps A also comprises:
During the up rotor channel correspondence of BS, the user terminal that belongs to BS is not arranged any transmission subchannel and OFDMA symbol combination, in during the descending transfer district of BS correspondence, the user terminal that belongs to RS is not arranged any transmission subchannel and OFDMA symbol combination.
Described steps A also comprises:
When having at least two RS, at these at least two RS different descending rotor channels and up rotor channel are set respectively in the BS physical layer frame structure, the OFDM transmitting set of different RS only sends the interim data of BS in corresponding up rotor channel, in other subchannel, do not arrange to send the interim data of BS, the OFDM wireless receiver of different RS only receives the interim data of BS in corresponding downstream rotor channel, do not arrange to receive the interim data of BS in other subchannel.
Described steps A also comprises:
Definition transfer range finding subchannel in the up transfer district of the sub-frame of uplink of the physical layer frame structure of BS, definition is used for initial access range finding Ranging, the Perodic ranging Ranging of RS, the BS transfer range finding of bandwidth request receives subchannel and OFDMA symbol combination, and this transfer range finding subchannel also can be used as initial access range finding Ranging, Perodic ranging Ranging, the bandwidth request range finding subchannel of user terminal and uses;
In the descending transfer district of the descending sub frame of the physical layer frame structure of RS, transfer range finding subchannel is set, is used to define initial access range finding Ranging, the Perodic ranging Ranging of RS, the RS transfer range finding of bandwidth request sends subchannel and OFDMA symbol combination;
The time-frequency relation of the described transfer range finding subchannel that is provided with in BS and RS must be corresponding one by one and synchronous.
Described steps A also comprises:
In the descending sub frame of the physical layer frame structure of the sub-frame of uplink of the physical layer frame structure of BS or RS, during the correspondence in descending sub frame head, transfer range finding subchannel, up rotor channel and up transfer district, the OFDM transmitting set of BS receiver and different RS is by the remainder of different subchannels and shared RS descending sub frame of OFDMA symbol combination or BS sub-frame of uplink;
In the sub-frame of uplink of the physical layer frame structure of the descending sub frame of the physical layer frame structure of BS or RS, except that descending sub frame head, descending sub frame head receive, transfer range finding subchannel and the descending rotor channel, the OFDM wireless receiver of BS transmitter and different RS is by the remainder of the sub-frame of uplink of the OFDM wireless receiver of different subchannels and shared BS descending sub frame of OFDMA symbol combination or RS.
Described steps A also comprises:
Definition descending sub frame head in the descending sub frame of the physical layer frame structure of BS, this descending sub frame head is the beginning of descending sub frame, be used to define subchannel and OFDMA symbol combination that sends user's synchronizing information and subchannel and the OFDMA symbol combination that sends indication information, with indication BS physical layer frame structure descending sub frame and each subchannel of sub-frame of uplink and the position and the using method profile of OFDMA symbol combination;
Definition descending sub frame head in the descending sub frame of the physical layer frame structure of RS, this descending sub frame head is the beginning of descending sub frame, be used to define subchannel and OFDMA symbol combination that sends user's synchronizing information and subchannel and the OFDMA symbol combination that sends indication information, with indication RS physical layer frame structure descending sub frame and each subchannel of sub-frame of uplink and the position and the using method profile of OFDMA symbol combination.
Described steps A also comprises:
During the descending sub frame head of RS, the sub-frame of uplink of BS is not arranged any reception subchannel and OFDMA symbol combination;
During the descending sub frame head of RS, the descending sub frame of the physical layer frame structure of other RS can not be arranged any transmission subchannel and OFDMA symbol combination, perhaps, if the descending sub frame head of different RS is overlapping in time, then must be fully overlapping and synchronous, and its content must be identical.
Described steps A also comprises:
The descending sub frame head is set in the sub-frame of uplink of the physical layer frame structure of RS to be received, be used to define the subchannel and the OFDMA symbol combination of the descending sub frame head that receives BS, the time-frequency relation of the descending sub frame head of this descending sub frame head reception and described BS must be corresponding one by one, synchronously complete.
Described steps A also comprises:
Definition range finding subchannel in the sub-frame of uplink of the physical layer frame structure of BS, definition are used for initial access range finding Ranging, the Perodic ranging Ranging of user terminal, the BS range finding of bandwidth request receives subchannel and OFDMA symbol combination;
Definition transfer range finding subchannel in the sub-frame of uplink of the physical layer frame structure of RS, definition are used for initial access range finding Ranging, the Perodic ranging Ranging of user terminal, the RS range finding of bandwidth request receives subchannel and OFDMA symbol combination.
Described steps A also comprises:
At the descending sub frame of BS to reserving transmission/reception change gap TTG duration between the sub-frame of uplink of BS at least, at the sub-frame of uplink of BS to reserving reception/transmission change gap RTG duration between the descending sub frame of BS at least, descending sub frame at RS is reserved the TTG duration at least between the sub-frame of uplink of RS, reserves the RTG duration at the sub-frame of uplink of RS at least between the descending sub frame of RS.
Described step B specifically comprises:
The up-downgoing rotor channel that comprises in the uplink and downlink physical layer frame based on BS that is provided with and RS between BS, RS and user terminal, transfer range finding subchannel, descending sub frame head, descending sub frame head receive, the range finding subchannel carries out the mutual of message, realize wireless transfer communication.
A kind of method that realizes wireless transfer communication based on OFDM comprises step:
C, BS send data also with this metadata cache to RS in the descending rotor channel of the descending sub frame of BS; User terminal sends the uplink communication data to RS in the OFDM subchannel except that the reception of descending sub frame head, transfer range finding subchannel and up rotor channel of RS sub-frame of uplink, and with this metadata cache;
The data that described BS that D, RS will receive and user terminal send send to described BS and user terminal after carrying out the network code processing more simultaneously;
E, described BS and user terminal carry out network decoding with the data of described data in buffer and described RS transmission to be handled, and obtains described user terminal and the BS data by the RS transfer.
Described step C specifically comprises:
C1, BS send lead code in the descending sub frame head of descending sub frame, RS receives this lead code by the reception of the descending sub frame head in the sub-frame of uplink of RS subchannel and BS obtains synchronously;
C2, BS have sent described lead code in descending sub frame after, send FCH, DL-MAP and UL-MAP information, RS receives subchannel by the descending sub frame head in the sub-frame of uplink of RS and receives this FCH, DL-MAP and UL-MAP information, obtains time slot, subchannel and/or OFDMA symbol combination position and the using method profile information of descending and up each burst of BS;
C3, BS send descending transfer communication data to RS in the descending rotor channel of descending sub frame, and with this metadata cache, RS receives the data that described BS sends by the descending rotor channel in the sub-frame of uplink of RS.
Described step C specifically comprises:
C4, RS send lead code in the descending sub frame head of the descending sub frame of RS, user terminal receives this lead code and RS obtains synchronously;
C5, RS send FCH, DL-MAP, UL-MAP information in the descending sub frame of the descending sub frame of RS, user terminal receives this FCH, DL-MAP, UL-MAP information, obtains subchannel and OFDMA symbol combination position and the using method profile information of descending and up each burst of RS;
C6, user terminal send the uplink communication data to RS in the OFDM subchannel except that the reception of descending sub frame head, transfer range finding subchannel and up rotor channel of RS sub-frame of uplink, and with this metadata cache, RS receives the data that described user terminal sends from corresponding OFDM subchannel.
Described step C also comprises:
The described corresponding OFDM subchannel of described C6 can be chosen in the sub-frame of uplink of same RS with the descending rotor channel in the described sub-frame of uplink of described C3.
Described step D specifically comprises:
The data that described BS that D1, RS will receive and user terminal send are carried out network code and are handled the data after obtaining to encode;
D2, RS send lead code in the descending sub frame head of the descending sub frame of RS, user terminal receives this lead code and RS obtains synchronously;
D3, RS send FCH, DL-MAP, UL-MAP information in the descending sub frame head of the descending sub frame of RS, user terminal receives this FCH, DL-MAP, UL-MAP information, obtains time slot, subchannel and/or OFDMA symbol combination position and the using method profile information of descending and up each burst of RS;
D4, RS send data behind the described coding to BS and user terminal in the up rotor channel of the descending sub frame of RS, BS and user terminal receive the data behind this coding from this up rotor channel.
Described step D1 specifically comprises:
RS directly does the XOR processing by bit with the data of described BS transmission and the data of described user terminal transmission, the data after obtaining to encode.
Described step e specifically comprises:
Data behind the coding that user terminal sends its data in buffer and the described RS that receives carry out obtaining the data of BS by the RS transfer after network decoding handles;
Data behind the coding that BS sends its data in buffer and the described RS that receives carry out obtaining the data of user terminal by the RS transfer after network decoding handles.
Described step e specifically comprises:
When data behind the coding that described RS sends during for the data that obtain after handling by XOR, the data behind the coding that user terminal sends its data in buffer and the described RS that receives carry out obtaining the data of BS by the RS transfer after XOR handles; Data behind the coding that BS sends its data in buffer and the described RS that receives carry out obtaining the data of user terminal by the RS transfer after XOR handles.
As seen from the above technical solution provided by the invention, the present invention is by introducing the mechanism of OFDMA (or OFDM subchannel) technology and network coding technique, and the physical layer frame structure of definition BS and RS is compared with prior art, has following advantage:
1, can farthest increase the throughput of wireless transfer communication system, can increase throughput in theory and reach 25%;
2, the present invention is based on the characteristics of network coding technique and OFDMA (or the OFDM subchannel) physical layer frame structure that defines, support effectively OFDMA (or OFDM subchannel) wireless in rotating function, promptly MS/SS can carry out wireless transfer by RS and inserts BS; And can avoid the interference of " SS/MSRS is to RS " and " SS/MSBS is to RS "; Avoid the interference of " SS/MSBS is to SS/MSRS " and " SS/MSRS is to SS/MSBS "; Avoid the interference of " BS is to RS " and " RS is to BS ".
Description of drawings
Fig. 1 is the adjacent situation schematic diagram of OFDMA symbol subcarrier;
Fig. 2 is based on 802.16 OFDMA (or SOFDMA) the frame structure schematic diagram in the communication system of FDD;
Fig. 3 is the transfer pattern diagram of existing wireless transfer communication system;
Fig. 4 is OFDM (or OFDMA) the transfer pattern diagram of coding techniques Network Based of the present invention;
Fig. 5 is the co-channel interference pattern diagram of OFDM (or OFDMA) the transfer pattern of coding techniques Network Based of the present invention;
Fig. 6 is the functional framework schematic diagram of wireless transfer communication OFDM connecting system of the present invention;
Fig. 7 is the embodiment schematic diagram of the physical layer frame structure of BS of the present invention and RS.
Embodiment
The model schematic diagram of the OFDM of coding techniques Network Based provided by the invention (or OFDMA) transfer system as shown in Figure 4, adopt TDD/OFDMA (or OFDM subchannel) mode communicating by letter between RS and BS, MS/SS with under the frequency, MS/SS carries out wireless transfer by RS and inserts BS, and RS inserts BS as a MS/SS.
In Fig. 4, DL BSBe the descending sub frame of the physical layer frame of BS, by BS to SS/MS BSOr RS, UL BSFor the sub-frame of uplink of the physical layer frame of BS, by SS/MS BSOr RS is to BS, SS/MS BSKeep receiving frame synchronous with BS; DL RSBe the descending sub frame of the physical layer frame of RS, by BS to SS/MS RSOr RS, UL RSFor the sub-frame of uplink of the physical layer frame of RS, by SS/MS RSOr RS is to BS.
Base station and subscriber station only need 2 time slots by the terminal exchange data packets.
At time slot 1, carry out following processing:
1, the bag B of the bag A of BS and MS issues RS by different OFDM subchannels respectively, BS buffer memory bag A, MS buffer memory bag B;
2, RS does network code with the bag A of BS and the bag B of MS, for example directly does the nonequivalence operation processing by bit and obtains A B.
At time slot 2, carry out following processing:
3, RS will finish the bag A of network code B does broadcasting, simultaneously, will wrap A B issues BS and MS;
4, BS does network decoding, with the bag A of buffer memory and the bag A of network code B does nonequivalence operation and handles the bag B that obtains MS, i.e. A (A B)=B; MS does network decoding, with the bag A of buffer memory bag B and network code B does nonequivalence operation and handles the bag A that obtains BS, i.e. B (A B)=A.
The OFDM of described coding techniques Network Based (or OFDMA) transfer communication system will be introduced the mutual co-channel interference as 3 kinds of situations of Fig. 5 (a)-(c).Wherein, TX represents sending module, and RX represents receiver module.
The functional framework of wireless transfer communication OFDM connecting system provided by the invention as shown in Figure 6, this wireless transfer communication OFDM connecting system comprises BS, RS and SS/MS.
Wherein BS comprises:
The wire transmission processing unit: can be with upper level equipment (as base station controller) or set up with one group of base station equipment respectively and communicate by letter, and and upper level equipment or each base station equipment between carry out information alternately;
OFDM transceiver: be used for carrying out radio communication in the OFDM mode, form by OFDM transmitting set physical layer processing unit, OFDM wireless receiver physical layer processing unit and OFDM transceiver data link layer deals unit with RS or SS/MS.
Wherein, OFDM transmitting set physical layer processing unit: respectively with OFDM transceiver data link layer and RS that can communicate with or SS/MS in OFDM wireless receiver physical layer processing unit carry out the OFDM radio communication.
Wherein, OFDM wireless receiver physical layer processing unit: respectively with OFDM transceiver data link layer and RS that can communicate with or SS/MS in OFDM transmitting set physical layer processing unit carry out the OFDM radio communication.
Wherein, OFDM data link layer deals unit: to data from OFDM wireless receiver physical layer processing unit, the Data Receiving of making OFDM transceiver data link layer handle and network decoding after, be transmitted to the wire transmission processing unit; To data from the wire transmission processing unit, make the data sending processing of OFDM transceiver data link layer after, be transmitted to OFDM transmitting set physical layer processing unit.
RS comprises:
OFDM transceiver: be used for carrying out the OFDM radio communication in the OFDM mode, form by OFDM transmitting set physical layer processing unit, OFDM wireless receiver physical layer processing unit and OFDM data link layer deals unit with BS or SS/MS.
OFDM transmitting set physical layer processing unit: respectively with OFDM transceiver data link layer and BS that can communicate with or SS/MS in the wireless receiver physical layer processing unit carry out the OFDM radio communication.
OFDM wireless receiver physical layer processing unit: respectively with OFDM transceiver data link layer and BS that can communicate with or SS/MS in the transmitting set physical layer processing unit carry out the OFDM radio communication.
OFDM data link layer deals unit: to data from OFDM wireless receiver physical layer processing unit, after doing Data Receiving processing, network code and the transmission processing of OFDM transceiver data link layer, be transmitted to OFDM transmitting set physical layer processing unit.
SS/MS comprises:
OFDM transceiver: be used for carrying out the OFDM radio communication in the OFDM mode, form by OFDM transmitting set physical layer processing unit, OFDM wireless receiver physical layer processing unit and OFDM data link layer deals unit with RS or BS.
OFDM transmitting set physical layer processing unit: carry out the OFDM radio communication with OFDM transceiver data link layer and the RS that can communicate with or BS wireless receiver physical layer processing unit respectively.
OFDM wireless receiver physical layer processing unit: respectively with OFDM transceiver data link layer and RS that can communicate with or BS in the transmitting set physical layer processing unit carry out the OFDM radio communication.
OFDM data link layer deals unit: to data from OFDM wireless receiver physical layer processing unit, the Data Receiving of making OFDM transceiver data link layer handle and network decoding after, be transmitted to the user; To from user's data, make the data sending processing of OFDM transceiver data link layer after, be transmitted to OFDM transmitting set physical layer processing unit.
The present invention need be provided with the physical layer frame structure of rational BS and RS for realizing above-mentioned wireless transfer communication OFDM connecting system, thereby guarantees that the transfer communication process can realize reliably, simultaneously, can also avoid the various interference that may exist among Fig. 5 effectively.
In the implementation of the physical layer frame structure of BS and RS, need to carry out following setting:
1, at the descending sub frame DL of the physical layer frame structure of BS BSMiddle definition " DL Relay Subchannel (descending rotor channel) " is used to define descending rotor channel of BS and the OFDMA symbol combination of being passed to RS by BS; For the situation of many RS, at the different different descending rotor channels of RS definition;
2, at the sub-frame of uplink UL of the physical layer frame structure of RS RSMiddle definition " DL RelaySubchannel (descending rotor channel) " is used to define rotor channel and the OFDMA symbol combination that RS receives the DL Relay Zone of BS; For the situation of many RS, different RS only receives the interim data of BS in corresponding downstream rotor channel, and other subchannel does not arrange transfer to receive;
3, at the sub-frame of uplink UL of the physical layer frame structure of BS BSMiddle definition " UL Relay Subchannel (up rotor channel) " is used to define up rotor channel of BS and the OFDMA symbol combination of being passed to BS by RS; For the situation of many RS, at the different different up rotor channels of RS definition;
4, at the descending sub frame DL of the physical layer frame structure of RS RSThe middle TDM technology that adopts, definition " ULRelay Subchannel (up rotor channel) " is used to define rotor channel and the OFDMA symbol combination that RS receives the UL RelayZone of BS; For the situation of many RS, different RS only sends the interim data of BS in corresponding up rotor channel, and other subchannel can not arrange transfer to send;
5, during BS UL Relay Subchannel, SS/MS BSDo not arrange any transmission subchannel and OFDMA symbol combination, avoid " SS/MS BSTo BS " interference; During RS DL RelaySubchannel, SS/MS RSDo not arrange any transmission to send subchannel and OFDMA symbol combination, avoid " SS/MS RSTo RS " interference;
6, at the sub-frame of uplink UL of the physical layer frame structure of BS BSUL Relay Zone in definition " Relay Ranging Subchannel (transfer range finding subchannel; be abbreviated as RRS) ", be used to define initial access range finding Ranging, the Perodic ranging Ranging that is used for RS, the BS transfer range finding of bandwidth request receives subchannel and OFDMA symbol combination; This transfer range finding subchannel RRS also can be used as SS/MSS BSInitial access range finding Ranging, Perodic ranging Ranging, bandwidth request range finding subchannel use;
7, at the descending sub frame DL of the physical layer frame structure of RS RSDL Relay Zone in definition " Relay Ranging TX Subchannel (transfer range finding subchannel; be abbreviated as RRS TX) ", be used to define initial access range finding Ranging, the Perodic ranging Ranging of RS, the RS transfer range finding of bandwidth request sends subchannel and OFDMA symbol combination;
8, the time-frequency of the Relay Ranging TXSubchannel of the Relay Ranging Subchannel of BS and RS relation must be corresponding one by one, strict synchronism;
9, in the sub-frame of uplink of the physical layer frame structure of the descending sub frame of BS physical layer frame structure or RS, except that DL Header, DL Header RX, RRS and DL Relay Subchannel, BS transmitter and different RS receiver are shared the remainder of BS descending sub frame or RS RX sub-frame of uplink by different subchannels and OFDMA symbol combination, with respectively with SS/MS BSAnd SS/MS RS" SS/MS is avoided in communication RSTo SS/MS BS", " BS is to RS " and " SS/MS RSTo RS " interference;
10, in the descending sub frame of the sub-frame of uplink of BS physical layer frame structure or RS physical layer frame structure, during the correspondence of DL Header, Ranging Subchannel, RRS TX and UL Relay Zone, BS receiver and different RS transmitter are shared the remainder of RS descending sub frame or BS sub-frame of uplink by different subchannels and OFDMA symbol combination, with respectively with SS/MS BSAnd SS/MS RS" SS/MS is avoided in communication BSTo SS/MS RS", " RS is to BS " and " SS/MS BSTo BS " interference;
11, at the descending sub frame DL of the physical layer frame structure of BS BSMiddle definition " DL Header (descending sub frame head) ", this DL Header is descending sub frame DL BSBeginning, be used to define subchannel and OFDMA symbol combination that sends user's synchronizing information and subchannel and the OFDMA symbol combination that sends indication information, with indication BS physical layer frame structure descending sub frame and each subchannel of sub-frame of uplink and the position and the using method profile of OFDMA symbol combination.Comprise preamble, FCH, DL-MAP, UL-MAP in former 802.16 OFDMA (or SOFDMA) frame, SS/MS BS, RS and BS keep receiving frame synchronous;
12, at the descending sub frame DL of the physical layer frame structure of RS RSMiddle definition " DL Header (descending sub frame head) ", this DL Header is the beginning of descending sub frame, be used to define subchannel and OFDMA symbol combination that sends user's synchronizing information and subchannel and the OFDMA symbol combination that sends indication information, with indication RS physical layer frame structure descending sub frame and each subchannel of sub-frame of uplink and the position and the using method profile of OFDMA symbol combination.Comprise preamble, FCH, DL-MAP, UL-MAP in former 802.16 OFDMA (or SOFDMA) frame, SS/MS RSKeep receiving frame synchronous with RS;
13, during the DL of RS Header, the sub-frame of uplink UL of BS BSDo not arrange any reception subchannel and OFDMA symbol combination, avoid " SS/MS BSTo SS/MS RS" and " SS/MS RSTo SS/MS BS" interference;
14, during the DL of RS Header, the descending sub frame DL of the physical layer frame structure of other RS RSCan not arrange any transmission subchannel and OFDMA symbol combination, avoid that " RS is to SS/MS RS" interference; Perhaps, if the DL Header of different RS is overlapping in time, then must be overlapping fully, strict synchronism, and its content must be identical avoids that " RS is to SS/MS RS" interference;
15, at the sub-frame of uplink UL of the physical layer frame structure of RS RSIn definition " DL Header RX (receptions of descending sub frame head) ", be used to define subchannel and the OFDMA symbol combination of the DL Header of reception BS;
16, the time-frequency of the DL Header RX of the DL Header of BS and RS concerns correspondence, strict synchronism one by one;
17, at the sub-frame of uplink UL of the physical layer frame structure of BS BSMiddle definition " RangingSubchannel (range finding subchannel) ", definition is used for SS/MSS BSInitial access range finding Ranging, Perodic ranging Ranging, the BS range finding of bandwidth request receive subchannel and OFDMA symbol combination;
18, at the sub-frame of uplink UL of the physical layer frame structure of RS RSMiddle definition " Relay RangingSubchannel (transfer range finding subchannel is called for short RRS) ", definition is used for SS/MSS RSInitial access range finding Ranging, Perodic ranging Ranging, the RS range finding of bandwidth request receive subchannel and OFDMA symbol combination;
19, the descending sub frame DL of BS BSSub-frame of uplink UL to BS BSBetween reserve the TTG duration at least; The sub-frame of uplink UL of BS BSDescending sub frame DL to BS BSBetween reserve the RTG duration at least; The descending sub frame DL of RS RSSub-frame of uplink UL to RS RSBetween reserve the TTG duration at least; The sub-frame of uplink UL of RS RSDescending sub frame DL to RS RSBetween reserve the RTG duration at least.
According to the above-mentioned physical layer frame structure that provides, the present invention also provides the embodiment of the physical layer frame structure of a kind of BS and RS, as shown in Figure 7, wherein, the part of " NULL " part for not arranging any reception or transmission.BS descending sub frame DL BSWith RS descending sub frame DL RSIn " white portion " be DL Header; RS sub-frame of uplink UL RSIn " white portion " be DL Header RX.
The present invention also provide concrete based on above-mentioned setting BS and the handling process of the described wireless transfer communication OFDM connecting system of the physical layer frame structure of RS, corresponding handling process comprises BS-successively〉RS, MS/SS-RS, network code, RS-BS and MS/SS, five stages of network decoding.
Introduce this five stages below respectively, be specially:
Phase I, BS send data to RS.
S1, BS are at descending sub frame DL BS" DL Header " in first symbol symbol or time slot send lead code preamble;
S2, RS are by RS sub-frame of uplink UL RSIn " DL Header RX " receive described BS descending sub frame DL BS" DL Header " in lead code preamble and BS obtain synchronously;
S3, BS are at descending sub frame DL BS" DL Header " in sent after the preamble, continue to send FCH, DL-MAP and UL-MAP.
S4, RS are by RS sub-frame of uplink UL RSIn " DL Header RX " receive described DL BS" DL Header " in FCH, DL-MAP, UL-MAP, obtain time slot, subchannel and/or OFDMA character position and using method (profile) information of descending and up each burst of BS.
S5, BS are at descending sub frame DL BS" DL Relay Subchannel " in send descending transfer communication data A to RS; The data cached A of BS;
S6, RS are by RS sub-frame of uplink UL RSIn " DL Relay Subchannel " receive the descending transfer communication data A that described BS sends.
Second stage, MS/SS send data to RS.
S1, RS are at descending sub frame DL RS" DL Header " in first symbol symbol or time slot send lead code preamble;
S2, MS/SS receive described RS descending sub frame DL RS" DL Header " in lead code preamble and RS obtain synchronously;
S3, RS are at descending sub frame DL RS" DL Header " in sent after the preamble, continue to send FCH, DL-MAP, UL-MAP;
S4, MS/SS receive described RS descending sub frame DL RS" DL Header " in FCH, DL-MAP, UL-MAP, obtain subchannel and OFDMA character position and using method (profile) information of descending and up each burst of RS;
S5, MS/SS are at RS sub-frame of uplink UL RSIn, at the OFDM Subchannel except that DL Header RX, RRS and UL Relay Subchannel, send uplink communication data B to RS; The data cached B of MS;
S6, RS receive the uplink communication data B that described MS/SS sends from corresponding OFDM Subchannel.
" the DL Relay Subchannel " of above-mentioned phase I S6 and the OFDM Subchannel of second stage S6 can be chosen in the same RS sub-frame of uplink, to reduce the transfer time delay.
Phase III, RS carry out network code with the data that receive.
S1, RS do network code with the data A of BS and the data B of MS, the data C after obtaining encoding, for example, when described network code when directly doing nonequivalence operation and handle by bit, C=A then B;
Data after quadravalence section, RS will encode send to BS and MS/SS.
S1, RS are at descending sub frame DL RS" DL Header " in first symbol symbol or time slot send lead code preamble;
S2, MS/SS receive described RS descending sub frame DL RS" DL Header " in lead code preamble and RS obtain synchronously;
S3, RS are at descending sub frame DL RS" DL Header " in sent after the preamble, send FCH, DL-MAP, UL-MAP; The transfer purpose MS/SS of RS special instructions BS in DL MAP receives data at UL Relay Subchannel;
S4, MS/SS receive described DL RSFCH, DL-MAP, the UL-MAP of " DL Header ", obtain time slot, subchannel and/or OFDMA character position and using method (profile) information of descending and up each burst of RS;
S5, RS are at RS descending sub frame DL RS" UL Relay Subchannel " in send data C behind the network code to BS and MS/SS;
S6, BS and purpose MS/SS receive the network code data C that RS sends from described S5 " UL Relay Subchannel ";
Five-stage, BS and MS/SS carry out network decoding with the data that receive.
S1, purpose MS/SS do network decoding with data in buffer B and the network code data C that receives, obtain the data A of BS by the RS transfer, for example, and with the data A of purpose MS/SS data in buffer B and network code B does nonequivalence operation and handles the data A that obtains BS, i.e. B (A B)=A;
S2, BS do network decoding with data in buffer A and the network code data C that receives, obtain the data B of MS/SS by the RS transfer, for example, and with the data A of BS data in buffer A and network code B does nonequivalence operation and handles the data B that obtains MS/SS, i.e. A (A B)=B.
S1 and S2 in the above-mentioned five-stage do not have subordinate relation, and be separate.
In sum, the present invention is by introducing the mechanism of OFDMA (or OFDM subchannel) technology and network coding technique, the physical layer frame structure of definition BS and RS, thus the throughput of wireless transfer communication system can farthest be increased, and can avoid the various interference that may exist effectively.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.

Claims (23)

1, a kind of wireless transfer communication OFDM access system, it is characterized in that, comprise base station BS, terminal RS and user terminal, this RS provides the interface with BS and user terminal communication respectively, and the OFDM data link layer deals unit that in this RS, comprises an orthogonal frequency division multiplex OFDM transceiver and coding techniques Network Based, OFDM transceiver among the RS carries out radio communication in the OFDM mode with BS and user terminal, and OFDM transmitting set physical layer element that the OFDM transceiver among the RS comprises and OFDM wireless receiver physical location are corresponding with OFDM wireless receiver physical layer element and OFDM transmitting set physical layer element in BS and the user terminal respectively.
2, system according to claim 1 is characterized in that, described user terminal comprises:
OFDM transmitting set physical layer processing unit: carry out the OFDM radio communication with OFDM transceiver data link layer and the RS that can communicate with or BS wireless receiver physical layer processing unit respectively;
OFDM wireless receiver physical layer processing unit: respectively with OFDM transceiver data link layer and RS that can communicate with or BS in the transmitting set physical layer processing unit carry out the OFDM radio communication;
OFDM data link layer deals unit: to data from OFDM wireless receiver physical layer processing unit, the Data Receiving of making OFDM transceiver data link layer handle and network decoding after, be transmitted to the user; To from user's data, make the data sending processing of OFDM transceiver data link layer after, be transmitted to OFDM transmitting set physical layer processing unit.
3, system according to claim 1 is characterized in that, described RS comprises:
OFDM transmitting set physical layer processing unit: respectively with OFDM transceiver data link layer and BS that can communicate with or user terminal in the wireless receiver physical layer processing unit carry out the OFDM radio communication;
OFDM wireless receiver physical layer processing unit: respectively with OFDM transceiver data link layer and BS that can communicate with or user terminal in the transmitting set physical layer processing unit carry out the OFDM radio communication.
OFDM data link layer deals unit: to data from OFDM wireless receiver physical layer processing unit, after doing Data Receiving processing, network code and the transmission processing of OFDM transceiver data link layer, be transmitted to OFDM transmitting set physical layer processing unit.
4, according to claim 2 or 3 described systems, it is characterized in that described BS comprises:
The wire transmission processing unit: can be with upper level equipment or set up with one group of base station equipment respectively and communicate by letter, and and upper level equipment or each base station equipment between carry out information alternately;
OFDM transmitting set physical layer processing unit: respectively with OFDM transceiver data link layer and RS that can communicate with or user terminal in OFDM wireless receiver physical layer processing unit carry out the OFDM radio communication;
OFDM wireless receiver physical layer processing unit: respectively with OFDM transceiver data link layer and RS that can communicate with or user terminal in OFDM transmitting set physical layer processing unit carry out the OFDM radio communication;
OFDM data link layer deals unit: to data from OFDM wireless receiver physical layer processing unit, the Data Receiving of making OFDM transceiver data link layer handle and network decoding after, be transmitted to the wire transmission processing unit; To data from the wire transmission processing unit, make the data sending processing of OFDM transceiver data link layer after, be transmitted to OFDM transmitting set physical layer processing unit.
5, a kind of method of the realization wireless transfer communication based on said system is characterized in that, comprises step:
A, in the descending sub frame of BS physical layer frame structure and sub-frame of uplink, descending rotor channel and up rotor channel are set respectively, are used to define by BS and pass to descending rotor channel of BS and the OFDMA symbol combination of RS and pass to up rotor channel of BS and the OFDMA symbol combination of BS by RS; In the sub-frame of uplink of the physical layer frame structure of RS, descending rotor channel is set, be used to define rotor channel and the OFDMA symbol combination that RS receives the descending transfer district of BS, in the descending sub frame of the physical layer frame structure of RS, up rotor channel is set, is used to define rotor channel and the OFDMA symbol combination that RS receives the up transfer district of BS;
B, the uplink and downlink physical layer frame based on the BS of described setting and RS between BS, RS and user terminal adopt the OFDM mode to carry out wireless transfer communication.
6, method according to claim 5 is characterized in that, described steps A also comprises:
During the up rotor channel correspondence of BS, the user terminal that belongs to BS is not arranged any transmission subchannel and OFDMA symbol combination, in during the descending transfer district of BS correspondence, the user terminal that belongs to RS is not arranged any transmission subchannel and OFDMA symbol combination.
7, method according to claim 5 is characterized in that, described steps A also comprises:
When having at least two RS, at these at least two RS different descending rotor channels and up rotor channel are set respectively in the BS physical layer frame structure, the OFDM transmitting set of different RS only sends the interim data of BS in corresponding up rotor channel, in other subchannel, do not arrange to send the interim data of BS, the OFDM wireless receiver of different RS only receives the interim data of BS in corresponding downstream rotor channel, do not arrange to receive the interim data of BS in other subchannel.
8, method according to claim 5 is characterized in that, described steps A also comprises:
Definition transfer range finding subchannel in the up transfer district of the sub-frame of uplink of the physical layer frame structure of BS, definition is used for initial access range finding Ranging, the Perodic ranging Ranging of RS, the BS transfer range finding of bandwidth request receives subchannel and OFDMA symbol combination, and this transfer range finding subchannel also can be used as initial access range finding Ranging, Perodic ranging Ranging, the bandwidth request range finding subchannel of user terminal and uses;
In the descending transfer district of the descending sub frame of the physical layer frame structure of RS, transfer range finding subchannel is set, is used to define initial access range finding Ranging, the Perodic ranging Ranging of RS, the RS transfer range finding of bandwidth request sends subchannel and OFDMA symbol combination;
The time-frequency relation of the described transfer range finding subchannel that is provided with in BS and RS must be corresponding one by one and synchronous.
9, method according to claim 5 is characterized in that, described steps A also comprises:
In the descending sub frame of the physical layer frame structure of the sub-frame of uplink of the physical layer frame structure of BS or RS, during the correspondence in descending sub frame head, transfer range finding subchannel, up rotor channel and up transfer district, the OFDM transmitting set of BS receiver and different RS is by the remainder of different subchannels and shared RS descending sub frame of OFDMA symbol combination or BS sub-frame of uplink;
In the sub-frame of uplink of the physical layer frame structure of the descending sub frame of the physical layer frame structure of BS or RS, except that descending sub frame head, descending sub frame head receive, transfer range finding subchannel and the descending rotor channel, the OFDM wireless receiver of BS transmitter and different RS is by the remainder of the sub-frame of uplink of the OFDM wireless receiver of different subchannels and shared BS descending sub frame of OFDMA symbol combination or RS.
10, method according to claim 5 is characterized in that, described steps A also comprises:
Definition descending sub frame head in the descending sub frame of the physical layer frame structure of BS, this descending sub frame head is the beginning of descending sub frame, be used to define subchannel and OFDMA symbol combination that sends user's synchronizing information and subchannel and the OFDMA symbol combination that sends indication information, with indication BS physical layer frame structure descending sub frame and each subchannel of sub-frame of uplink and the position and the using method profile of OFDMA symbol combination;
Definition descending sub frame head in the descending sub frame of the physical layer frame structure of RS, this descending sub frame head is the beginning of descending sub frame, be used to define subchannel and OFDMA symbol combination that sends user's synchronizing information and subchannel and the OFDMA symbol combination that sends indication information, with indication RS physical layer frame structure descending sub frame and each subchannel of sub-frame of uplink and the position and the using method profile of OFDMA symbol combination.
11, method according to claim 10 is characterized in that, described steps A also comprises:
During the descending sub frame head of RS, the sub-frame of uplink of BS is not arranged any reception subchannel and OFDMA symbol combination;
During the descending sub frame head of RS, the descending sub frame of the physical layer frame structure of other RS can not be arranged any transmission subchannel and OFDMA symbol combination, perhaps, if the descending sub frame head of different RS is overlapping in time, then must be fully overlapping and synchronous, and its content must be identical.
12, method according to claim 10 is characterized in that, described steps A also comprises:
The descending sub frame head is set in the sub-frame of uplink of the physical layer frame structure of RS to be received, be used to define the subchannel and the OFDMA symbol combination of the descending sub frame head that receives BS, the time-frequency relation of the descending sub frame head of this descending sub frame head reception and described BS must be corresponding one by one, synchronously complete.
13, method according to claim 12 is characterized in that, described steps A also comprises:
Definition range finding subchannel in the sub-frame of uplink of the physical layer frame structure of BS, definition are used for initial access range finding Ranging, the Perodic ranging Ranging of user terminal, the BS range finding of bandwidth request receives subchannel and OFDMA symbol combination;
Definition transfer range finding subchannel in the sub-frame of uplink of the physical layer frame structure of RS, definition are used for initial access range finding Ranging, the Perodic ranging Ranging of user terminal, the RS range finding of bandwidth request receives subchannel and OFDMA symbol combination.
14, method according to claim 5 is characterized in that, described steps A also comprises:
At the descending sub frame of BS to reserving transmission/reception change gap TTG duration between the sub-frame of uplink of BS at least, at the sub-frame of uplink of BS to reserving reception/transmission change gap RTG duration between the descending sub frame of BS at least, descending sub frame at RS is reserved the TTG duration at least between the sub-frame of uplink of RS, reserves the RTG duration at the sub-frame of uplink of RS at least between the descending sub frame of RS.
15, according to each described method of claim 5 to 14, it is characterized in that described step B specifically comprises:
The up-downgoing rotor channel that comprises in the uplink and downlink physical layer frame based on BS that is provided with and RS between BS, RS and user terminal, transfer range finding subchannel, descending sub frame head, descending sub frame head receive, the range finding subchannel carries out the mutual of message, realize wireless transfer communication.
16, a kind of method based on OFDM realization wireless transfer communication is characterized in that, comprises step:
C, BS send data also with this metadata cache to RS in the descending rotor channel of the descending sub frame of BS; User terminal sends the uplink communication data to RS in the OFDM subchannel except that the reception of descending sub frame head, transfer range finding subchannel and up rotor channel of RS sub-frame of uplink, and with this metadata cache;
The data that described BS that D, RS will receive and user terminal send send to described BS and user terminal after carrying out the network code processing more simultaneously;
E, described BS and user terminal carry out network decoding with the data of described data in buffer and described RS transmission to be handled, and obtains described user terminal and the BS data by the RS transfer.
17, method according to claim 16 is characterized in that, described step C specifically comprises:
C1, BS send lead code in the descending sub frame head of descending sub frame, RS receives this lead code by the reception of the descending sub frame head in the sub-frame of uplink of RS subchannel and BS obtains synchronously;
C2, BS have sent described lead code in descending sub frame after, send FCH, DL-MAP and UL-MAP information, RS receives subchannel by the descending sub frame head in the sub-frame of uplink of RS and receives this FCH, DL-MAP and UL-MAP information, obtains time slot, subchannel and/or OFDMA symbol combination position and the using method profile information of descending and up each burst of BS;
C3, BS send descending transfer communication data to RS in the descending rotor channel of descending sub frame, and with this metadata cache, RS receives the data that described BS sends by the descending rotor channel in the sub-frame of uplink of RS.
18, method according to claim 16 is characterized in that, described step C specifically comprises:
C4, RS send lead code in the descending sub frame head of the descending sub frame of RS, user terminal receives this lead code and RS obtains synchronously;
C5, RS send FCH, DL-MAP, UL-MAP information in the descending sub frame of the descending sub frame of RS, user terminal receives this FCH, DL-MAP, UL-MAP information, obtains subchannel and OFDMA symbol combination position and the using method profile information of descending and up each burst of RS;
C6, user terminal send the uplink communication data to RS in the OFDM subchannel except that the reception of descending sub frame head, transfer range finding subchannel and up rotor channel of RS sub-frame of uplink, and with this metadata cache, RS receives the data that described user terminal sends from corresponding OFDM subchannel.
19, according to claim 17 or 18 described methods, it is characterized in that described step C also comprises:
The described corresponding OFDM subchannel of described C6 can be chosen in the sub-frame of uplink of same RS with the descending rotor channel in the described sub-frame of uplink of described C3.
20, according to claim 17 or 18 described methods, it is characterized in that described step D specifically comprises:
The data that described BS that D1, RS will receive and user terminal send are carried out network code and are handled the data after obtaining to encode;
D2, RS send lead code in the descending sub frame head of the descending sub frame of RS, user terminal receives this lead code and RS obtains synchronously;
D3, RS send FCH, DL-MAP, UL-MAP information in the descending sub frame head of the descending sub frame of RS, user terminal receives this FCH, DL-MAP, UL-MAP information, obtains time slot, subchannel and/or OFDMA symbol combination position and the using method profile information of descending and up each burst of RS;
D4, RS send data behind the described coding to BS and user terminal in the up rotor channel of the descending sub frame of RS, BS and user terminal receive the data behind this coding from this up rotor channel.
21, method according to claim 20 is characterized in that, described step D1 specifically comprises:
RS directly does the XOR processing by bit with the data of described BS transmission and the data of described user terminal transmission, the data after obtaining to encode.
22, method according to claim 20 is characterized in that, described step e specifically comprises:
Data behind the coding that user terminal sends its data in buffer and the described RS that receives carry out obtaining the data of BS by the RS transfer after network decoding handles;
Data behind the coding that BS sends its data in buffer and the described RS that receives carry out obtaining the data of user terminal by the RS transfer after network decoding handles.
23, method according to claim 22 is characterized in that, described step e specifically comprises:
When data behind the coding that described RS sends during for the data that obtain after handling by XOR, the data behind the coding that user terminal sends its data in buffer and the described RS that receives carry out obtaining the data of BS by the RS transfer after XOR handles; Data behind the coding that BS sends its data in buffer and the described RS that receives carry out obtaining the data of user terminal by the RS transfer after XOR handles.
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