CN101034931A - Radio forwarding communication system and method - Google Patents
Radio forwarding communication system and method Download PDFInfo
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- CN101034931A CN101034931A CNA2006100548613A CN200610054861A CN101034931A CN 101034931 A CN101034931 A CN 101034931A CN A2006100548613 A CNA2006100548613 A CN A2006100548613A CN 200610054861 A CN200610054861 A CN 200610054861A CN 101034931 A CN101034931 A CN 101034931A
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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
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
Technical field
The present invention relates to wireless communication technology field, the OFDM that relates in particular to a kind of coding Network Based inserts (OFDMA) wireless transfer communication system and method.
Background technology
IEEE 802.16 is first broadband wireless access standard, mainly contains two versions: the broadband fixed wireless of 802.16 standards inserts version, and the broadband mobile wireless of " 802.16-2004 " and 802.16 standards inserts version, " 802.16e ".802.16-2004 only defined two kinds of network elements, BS and SS; 802.16e also only defined two kinds of network elements, BS and MSS.Present 802.16 Multihop Relay SG (802.16 multi-hop transfer seminar) have only proposed the notion of WiMAX terminal (RS), one of them important effect is as the transfer between BS and SS/MSS, enlarges the coverage of BS or the throughput of increase subscriber station.In order to support RS, which type of modification of this do and strengthen and still belong to novel problem actually of the physical layer frame structure of BS, RS and MS/SS.
At OFDM (Orthogonal Frequency Division Multiplex, OFDM) or OFDM insert (Orthogonal Frequency Division Multiplex Access, OFDMA) in the channel (Channel) of system (for example 802.16 systems), its OFDM or OFDMA symbol are made of subcarrier (Subcarrier), the number of subcarrier has determined fast fourier transform (Fast Fourier Transform, counting FFT).The subcarrier of forming a subchannel (Subchannel) can be adjacent, also can be non-conterminous, and Fig. 1 is the adjacent example of subcarrier.Have several by the kind subcarrier 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 space of up link, 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).Divide subchannel and mainly contain 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 FDD and TDD, and the SS of FDD mode can be half-duplex FDD, and for the frequency range of exempting to authorize, duplex mode can only be TDD.802.16 OFDMA (or SOFDMA) frame structure under the TDD, as shown in Figure 2.In 802.16 OFDMA (or SOFDMA) mode, physical layer (PHY) burst (burst) among the OFDMA (or SOFDMA) has been assigned with one group of adjacent subchannel and one group of OFDMA symbol (symbol).
The data of transmitting on physical channel are with the form transmission of frame (Frame).Every frame comprises descending sub frame (DL subframe is abbreviated as DL among Fig. 2) and sub-frame of uplink (UL subframe is abbreviated as UL among Fig. 2).Under the tdd mode, descending sub frame DL is transmission earlier, follows by sub-frame of uplink UL.A burst can distribute to a SS/MSS (or one group of user) up, can issue SS/MSS 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 frame control head (FCH) afterwards, be used for specifying the profile and the length thereof that follow the one or more descending Burst after FCH closely.Be subchannel and OFDMA character position and the using method (profile) that descending mapping table DL-MAP is used for each burst of indicating downlink then, up mapping table (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 and RTG 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, and concrete principle can be referring to the paper of IEEE: Li, Yeung; Cai, " LinearNetwork Coding, " IEEE Trans.Info.Thy, Feb.2003.
Existing transfer technology as shown in Figure 3 adopts FDD single carrier mode to communicate by letter between RS and BS, MS/SS, MS/SS carries out wireless transfer by RS and inserts BS, and RS inserts BS as a MS/SS.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; 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 need 4 time slots by the terminal exchange data packets: time slot 1, and BS is to RS; Time slot 2, MS is to RS; Time slot 3, RS is to MS; Time slot 4, RS is to BS.
Each interim data of prior art all will send twice, so the throughput of transfer system is lower, network capacity is limited, has influenced the scale and the cost of network.
In addition, under fdd mode, there is mutual disturbed condition between base station, terminal and the subscriber station in network system communication.
Summary of the invention
The object of the present invention is to provide a kind of transfer communication system that can farthest increase the transfer throughput, and the transfer communication method of this system's employing.
The OFDM that a kind of wireless transfer communication system of the present invention is based on network code inserts wireless transfer communication system, comprises base station BS, terminal RS and user terminal, and RS carries out radio communication in the FDD mode with BS and user terminal; This RS provides the interface with BS and user terminal communication respectively, and this RS comprises the radio link layer processing unit of a FDD transceiver and coding techniques Network Based; Include the radio link layer processing unit of FDD transceiver and decoding technique Network Based in this BS and the user terminal; The FDD transceiver of RS, BS and user terminal comprises FDD transmitting set physical layer processing unit and FDD wireless receiver physical layer processing unit; The FDD transmitting set physical layer processing unit of RS is corresponding with the FDD wireless receiver physical layer processing unit in BS and the user terminal respectively; The FDD wireless receiver physical layer processing unit of RS is corresponding with the FDD transmitter physical layer processing unit in BS and the user terminal respectively.
A kind of wireless transfer communication method of the present invention 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, be respectively applied for definition and pass to descending rotor channel of BS and the OFDMA symbol combination of RS and up rotor channel of BS and the OFDMA symbol combination of passing to BS by RS by BS; Descending rotor channel is set in the sub-frame of uplink of RS physical layer frame structure, be used to define rotor channel and the OFDMA symbol combination that RS receives the descending rotor channel of BS, up rotor channel is set in the descending sub frame of RS physical layer frame structure, is used to define up rotor channel and the OFDMA symbol combination that RS receives BS;
B, the uplink and downlink physical layer frame based on above-mentioned BS and RS between BS, RS and user terminal adopt the FDD mode to carry out the OFDMA wireless transfer communication.
The present invention farthest increases the throughput of transfer system by introducing the mechanism that OFDMA (or OFDM subchannel) technology combines with network coding technique, can increase throughput in theory and reach 25%, has effectively improved the defective of prior art.
OFDMA (or the OFDM subchannel) physical layer frame structure that the present invention is based on the characteristics of network coding technique and define is supported the wireless middle rotating function of OFDMA (or OFDM subchannel) effectively, and promptly MS/SS can carry out wireless transfer access BS by RS.
Can avoid that " RS is to SS/MS in the prior art
BS", " BS is to SS/MS
RS", " SS/MS
BSTo RS ", " SS/MS
RSTo BS " and self interference of " RS is to RS "; Can avoid that " RS is to SS/MS
RS" interference; , can avoid " SS/MS
BSTo BS ", " SS/MS
RSTo RS ", " SS/MS
RSTo SS/MS
BS", " SS/MS
BSTo SS/MS
RS" interference.
Description of drawings
The adjacent situation schematic diagram of Fig. 1 OFDMA symbol subcarrier.
Fig. 2 is based on 802.16 OFDMA (or SOFDMA) the frame structure schematic diagram under the TDD.
The transfer pattern diagram of the existing wireless transfer communication system of Fig. 3.
The senior transfer of the OFDM of Fig. 4 coding techniques Network Based of the present invention (or OFDMA) system.
The OFDM of Fig. 5 coding techniques Network Based of the present invention (or OFDMA) simplifies the transfer system.
Fig. 6 is based on the co-channel interference pattern diagram of the communication of the network system under the FDD.
The transfer system configuration schematic diagram of Fig. 7 coding Network Based of the present invention.
The BS of the senior transfer pattern of Fig. 8 the present invention and the physical layer frame structure schematic diagram of RS.
Fig. 9 the present invention simplifies the BS of transfer pattern and the physical layer frame structure schematic diagram of RS.
Embodiment
As shown in Figure 4, the present invention is based on the senior transfer system model of OFDM (or OFDMA) of network coding technique.Wherein adopt FDD/OFDMA (or OFDM subchannel) mode to communicate by letter between RS and BS, MS/SS, the descending and up employing frequency f 1 of RS of BS, the up and descending employing frequency f 2 of RS of BS, RS only need have a cover FDD transceiver.MS/SS carries out wireless transfer by RS and inserts BS, and RS inserts BS as a MS/SS.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; 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, the bag A of BS and the bag B of MS issue RS by different OFDM subchannels respectively, BS buffer memory bag A, MS buffer memory bag B; 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, the bag A B that RS will finish network code does broadcasting and issues BS and MS simultaneously; BS does network decoding, the bag A B of buffer memory bag A and network code is done nonequivalence operation handle the bag B that obtains MS, i.e. A (A B)=B; MS does network decoding, the bag A B of buffer memory bag B and network code is done nonequivalence operation handle the bag A that obtains BS, i.e. B (A B)=A.
The simplification transfer communication pattern of RS of the present invention as shown in Figure 5 and BS, MS/SS.Wherein, the downlink broadcast of DLBS burst (Broadcast Burst) as Preamble, FCH, DL-MAP, UL-MAP, is directly issued MS/SS by BS, not by the RS transfer; The range finding subchannel RangingSubchannel that initial access range finding Ranging, the Perodic ranging Ranging of MS/SS, bandwidth request are passed through ULBS directly issues BS by MS/SS, by the RS transfer; For descending other burst of DLBS, as data message or the message packet except that DL-MAP, UL-MAP, can not directly issue MS/SS by BS, must be by the RS transfer; Up other burst of ULBS as find range except that the initial access of MS/SS Ranging, Perodic ranging Ranging, bandwidth request message, can not directly be issued BS by MS/SS, must be by the RS transfer.
The transfer communication system of a kind of coding Network Based of the present invention as shown in Figure 7.Wherein,
The base station comprises:
Transmission processing unit (among the figure for 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;
FDD transceiver: be used for carrying out radio communication in the FDD mode, form by FDD transmitting set physical layer processing unit, FDD wireless receiver physical layer processing unit and wireless data link layer processing unit with RS or SS/MS.
FDD transmitting set physical layer processing unit (frequency is f1): respectively with the wireless data link layer and the SS/MS that can communicate with in FDD wireless receiver 1 physical layer processing unit or the FDD wireless receiver physical layer processing unit among the RS carry out radio communication; For simplifying the transfer pattern, this unit is to DL
BSDescending sub frame head broadcasting (as Preamble, FCH, DL-MAP, UL-MAP) adopt than higher chnnel coding and the modulation system (as binary phase shift keying BPSK) of other transmission data reliability, or adopt than the higher transmitting power of other transmission data, directly issue MS/SS, not by the RS transfer by BS;
FDD wireless receiver physical layer processing unit (frequency is f2): respectively with the wireless data link layer and the SS/MS that can communicate with in FDD transmitting set 1 physical layer processing unit or the FDD transmitting set physical layer processing unit among the RS carry out radio communication;
Wireless data link layer processing unit: to data from FDD wireless receiver physical layer processing unit, the Data Receiving of making the wireless 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 wireless data link layer after, be transmitted to FDD transmitting set physical layer processing unit.
Subscriber station comprises:
FDD transmitting set 1 physical layer processing unit (frequency is f2): respectively with FDD transceiver 1 and 2 data link layers and the BS that can communicate with in FDD wireless receiver physical layer processing unit carry out radio communication; For simplifying the transfer pattern, this unit is to UL
BSUplink random insert (RandomAccess) time slot (or being called competition slot Contention slot), as initial Ranging competition slot and bandwidth request competition slot, or initial access range finding Ranging, Perodic ranging Ranging, the bandwidth request of MS/SS are passed through UL
BSRange finding subchannel Ranging Subchannel, adopt than other and send higher chnnel coding and the modulation system (as binary phase shift keying BPSK) of data reliability, or adopt than the higher transmitting power of other transmission data, directly issue BS, by the RS transfer by MS/SS;
FDD transmitting set 2 physical layer processing unit (frequency is f1): respectively with FDD transceiver 1 and 2 data link layers and the RS that can communicate with in FDD wireless receiver physical layer processing unit carry out radio communication;
FDD wireless receiver 1 physical layer processing unit (frequency is f1): respectively with the wireless data link layer and the BS that can communicate with in FDD transmitting set physical layer processing unit carry out radio communication;
FDD wireless receiver 2 physical layer processing unit (frequency is f2): respectively with the wireless data link layer and the RS that can communicate with in the transmitting set physical layer processing unit carry out radio communication;
Wireless data link layer processing unit: to data from FDD wireless receiver 1 and/or 2 physical layer processing unit, the Data Receiving of making the wireless data link layer handle and network decoding after, be transmitted to the user; To from user's data, make the data sending processing of wireless data link layer after, be transmitted to FDD transmitting set 1 and/or 2 physical layer processing unit.
Terminal comprises:
FDD transceiver: be used for carrying out radio communication in the FDD mode, form by FDD transmitting set physical layer processing unit, FDD wireless receiver physical layer processing unit and wireless data link layer processing unit with SS/MS or BS.
FDD transmitting set physical layer processing unit: respectively with the wireless data link layer and the SS/MS that can communicate with in FDD wireless receiver 2 physical layer processing unit or BS FDD wireless receiver physical layer processing unit carry out radio communication;
FDD wireless receiver physical layer processing unit: respectively with the wireless data link layer and the SS/MS that can communicate with in FDD transmitting set physical layer processing unit among FDD transmitting set 2 physical layer processing unit or the BS carry out radio communication;
Wireless data link layer processing unit:, after doing the Data Receiving processing, network code of wireless data link layer and transmission and handling, be transmitted to FDD transmitting set physical layer processing unit to data from FDD wireless receiver physical layer processing unit.
The present invention as shown in Figure 8 simplifies in the physical layer frame structure of the BS of transfer pattern and RS:
Frequency at the physical layer frame structure of BS is the descending sub frame (DL of f1
BS) in, definition " DL RelaySubchannel (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;
Frequency at the physical layer frame structure of RS is the sub-frame of uplink (UL of f1
RS) in, definition " DL RelaySubchannel (descending rotor channel) " is used to define rotor channel and the OFDMA symbol combination that RS receives the DL RelaySubchannel 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;
Frequency at the physical layer frame structure of BS is the sub-frame of uplink (UL of f2
BS) in, definition " UL RelaySubchannel (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;
Frequency at the physical layer frame structure of RS is the descending sub frame (DL of f2
RS) the middle TDM technology that adopts, increase " UL Relay Subchannel (up rotor channel) ", be used to define rotor channel and the OFDMA symbol combination that RS receives the ULRelay Subchannel 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;
During BS UL Relay Subchannel, SS/MS
BSDo not arrange any transmission subchannel and OFDMA symbol combination, avoid " SS/MS
BSTo BS " interference; During BS DL Relay Subchannel, SS/MS
RSDo not arrange any transmission to send subchannel and OFDMA symbol combination, avoid " SS/MS
RSTo RS " interference;
Frequency at the physical layer frame structure of BS is the sub-frame of uplink (UL of f2
BS) in definition " RelayRanging Subchannel (transfer range finding subchannel; be abbreviated as RRS) ", 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; This transfer range finding subchannel RRS also can be used as SS/MS
BSInitial access range finding Ranging, Perodic ranging Ranging, bandwidth request range finding subchannel use.Frequency at the physical layer frame structure of RS is the descending sub frame (DL of f2
RS) in definition " Relay Ranging TXSubchannel (transfer range finding sends 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.The time-frequency relation of the RelayRanging TX Subchannel of the Relay Ranging Subchannel of BS and RS must be corresponding one by one, strict synchronism.
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 DLHeader, DL Header RX, RRS and DL Relay Subchannel, BS transmitter and different RS receiver are shared the remainder of BS descending sub frame or RSRX 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" interference.
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 DLHeader, Ranging Subchannel, RRS TX and UL Relay Subchannel, 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" interference.
Frequency at the physical layer frame structure of BS is the descending sub frame (DL of f1
BS) middle definition " DL Header (descending sub frame head) ", beginning for 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.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.Frequency at the physical layer frame structure of RS is the sub-frame of uplink (UL of f1
RS) in 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.The time-frequency relation of the DL Header RX of the DL Header of BS and RS must corresponding one by one, strict synchronism.
Frequency at the physical layer frame structure of BS is the sub-frame of uplink (UL of f2
BS) middle definition " RangingSubchannel (range finding subchannel) ", definition is used for SS/MS
BSInitial access range finding Ranging, Perodic ranging Ranging, the BS range finding of bandwidth request receive subchannel and OFDMA symbol combination.
Also comprising in the BS of the senior transfer pattern of the present invention as shown in Figure 9 and the physical layer frame structure of RS, is the descending sub frame (DL of f2 in the frequency of the physical layer frame structure of RS
RS) middle definition " DL Header (descending sub frame head) ", beginning for 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.
During the DL of RS Header, the sub-frame of uplink (UL of BS
BS) do not arrange any reception subchannel and OFDMA symbol combination, avoid " SS/MS
BSTo SS/MS
RS" interference.
During the DL of RS Header, the descending sub frame (DL of the physical layer frame structure of other RS
RS) can 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.
Frequency at the physical layer frame structure of RS is the sub-frame of uplink (UL of f1
RS) middle definition " RelayRanging Subchannel (transfer range finding subchannel is called for short RRS) ", definition is used for SS/MS
RSInitial access range finding Ranging, Perodic ranging Ranging, the RS range finding of bandwidth request receive subchannel and OFDMA symbol combination.
The part of " NULL " among Fig. 8 and 9 for not arranging any reception or transmission.Wherein, BS descending sub frame (DL
BS) and RS descending sub frame (DL
RS) in " white portion " be DL Header; RS sub-frame of uplink (UL
RS) in " white portion " be DL Header RX.
Transfer communication flow process based on above-mentioned physical layer frame structure and special secondary school system comprises:
Phase I (base station is to transfer):
S1. the base station is the descending sub frame (DL of f1 in frequency
BS) first symbol symbol or time slot in " DL Header " send lead code preamble;
S2. terminal is the terminal sub-frame of uplink (UL of f1 by frequency
RS) in " DL Header RX " receive base station down subframe (DL
BS) lead code preamble and BS in " DL Header " obtain synchronously;
S3. the base station is the descending sub frame (DL of f1 in frequency
BS) middle afterwards FCH, DL-MAP, the UL-MAP of sending of " DL Header " preamble;
S4. terminal is the terminal sub-frame of uplink (UL of f1 by frequency
RS) in " DL Header RX " receive descending sub frame (DL
BS) FCH of " DL Header ", DL-MAP, UL-MAP obtains time slot, subchannel and/or OFDMA character position and using method (profile) information of base station down and up each burst;
S5. the base station is the descending sub frame (DL of f1 in frequency
BS) " DL Relay Subchannel " in send descending transfer communication data A to terminal; The data cached A in base station;
S6. terminal is the terminal sub-frame of uplink (UL of f1 by frequency
RS) in " DL RelaySubchannel " receive the descending transfer communication data A that the base station sends among the S5.
Second stage (subscriber station is to terminal):
S1. transfer is the descending sub frame (DL of f2 in frequency
RS) first symbol symbol or time slot in " DL Header " send lead code preamble;
S2. the subscriber station receive frequency is the terminal descending sub frame (DL of f2
RS) lead code preamble and terminal in " DL Header " obtain synchronously;
S3. terminal is the descending sub frame (DL of f2 in frequency
RS) middle afterwards FCH, DL-MAP, the UL-MAP of sending of " DL Header " preamble;
S4. the subscriber station receive frequency is the terminal descending sub frame (DL of f2
RS) FCH of " DL Header ", DL-MAP, UL-MAP obtains subchannel and OFDMA character position and using method (profile) information of descending and up each burst of terminal;
S5. subscriber station is the terminal sub-frame of uplink (UL of f1 in frequency
RS) in, at the OFDM Subchannel except that DL Header RX, RRS and UL Relay Subchannel, send uplink communication data B to terminal; The data cached B of subscriber station;
S6. terminal is the uplink communication data B that subscriber station sends the OFDM Subchannel receiving step S5 of f1 from correspondent frequency;
Wherein, " the DL Relay Subchannel " of phase I S6 and the OFDM Subchannel of second stage step S6 can be chosen in the same terminal sub-frame of uplink, to reduce the transfer time delay.
Phase III (network code):
S1, terminal are done network code with the data A of base station and the data B of subscriber station, and the data C after obtaining encoding for example directly does nonequivalence operation by bit and handles, then C=A B;
Quadravalence section (being relayed to base station and subscriber station):
S1. terminal is the descending sub frame (DL of f2 in frequency
RS) first symbol symbol or time slot in " DL Header " send lead code preamble;
S2. the subscriber station receive frequency is the terminal descending sub frame (DL of f2
RS) lead code preamble and terminal in " DL Header " obtain synchronously;
S3. terminal is the descending sub frame (DL of f2 in frequency
RS) middle afterwards FCH, DL-MAP, the UL-MAP of sending of " DL Header " preamble; The transfer purpose subscriber station of terminal special instructions base station in DL MAP receives data at UL Relay Subchannel;
S4. the subscriber station receive frequency is the descending sub frame (DL of f2
RS) FCH of " DL Header ", DL-MAP, UL-MAP obtains time slot, subchannel and/or OFDMA character position and using method (profile) information of descending and up each burst of terminal;
S5. terminal is the terminal descending sub frame (DL of f2 in frequency
RS) " UL RelaySubchannel " in send data C behind the network code to base station and transfer;
S6. the purpose subscriber station is pressed the indication of terminal in DL MAP, receive the network code data C that terminal sends from the frequency of step S5 is " the UL Relay Subchannel " of f2, BS receives the network code data C of terminal transmission from the frequency of step S5 is " the UL Relay Subchannel " of f2;
Five-stage (network decoding):
S1. the purpose subscriber station is done network decoding with data in buffer B and the network code data C that receives, obtain the data A of base station by the terminal transfer, for example the data A B with purpose subscriber station data in buffer B and network code is the data A that the nonequivalence operation processing obtains the base station, i.e. B (A B)=A;
S2. network decoding is done with data in buffer A and the network code data C that receives in the base station, obtain the data B of subscriber station by the terminal transfer, for example the data A B with base station data in buffer A and network code is the data B that the nonequivalence operation processing obtains transfer, i.e. A (A B)=B.
Wherein, step S1 and step S2 do not have subordinate relation.
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 (33)
1, a kind of wireless transfer communication system is characterized in that:
Comprise base station BS, terminal RS and user terminal, RS carries out radio communication in the FDD mode with BS and user terminal;
This RS provides the interface with BS and user terminal communication respectively, and this RS comprises the radio link layer processing unit of FDD transceiver and coding techniques Network Based;
Include the radio link layer processing unit of FDD transceiver and decoding technique Network Based in this BS and the user terminal;
The FDD transceiver of RS, BS and user terminal comprises FDD transmitting set physical layer processing unit and FDD wireless receiver physical layer processing unit;
The FDD transmitting set physical layer processing unit of RS is corresponding with the FDD wireless receiver physical layer processing unit in BS and the user terminal respectively; The FDD wireless receiver physical layer processing unit of RS is corresponding with the FDD transmitter physical layer processing unit in BS and the user terminal respectively.
2, system according to claim 1 is characterized in that: the FDD transmitting set physical layer processing unit of BS and FDD wireless receiver physical layer processing unit are corresponding with the FDD wireless receiver physical layer processing unit and the FDD transmitting set physical layer processing unit of user terminal respectively.
3, system according to claim 1 and 2 is characterized in that, comprises in RS:
FDD transmitting set physical layer processing unit: carry out radio communication with the FDD wireless receiver physical layer processing unit in BS and the user terminal, send interim data to BS and user terminal;
FDD wireless receiver physical layer processing unit: carry out radio communication with the transmitting set physical layer processing unit in BS and the user terminal, receive the interim data that BS and user terminal send;
Radio link layer processing unit:, after making data and receiving processing, network code and transmission and handle, be transmitted to FDD transmitting set physical layer processing unit to interim data from FDD wireless receiver physical layer processing unit.
4, system according to claim 1 is characterized in that, comprises in BS:
FDD transmitting set physical layer processing unit: corresponding with the FDD wireless receiver physical layer processing unit of RS and/or user terminal, receive the interim data that RS sends;
FDD wireless receiver physical layer processing unit: corresponding with the FDD transmitting set physical layer processing unit of RS, send interim data to RS;
The radio link layer processing unit: to data from FDD wireless receiver physical layer processing unit, do that data receive to be handled and network decoding after, be transmitted to transmission processing unit; To data from transmission processing unit, make data sending processing after, be transmitted to FDD transmitter physical layer processing unit.
5, system according to claim 4 is characterized in that, also comprises in BS:
Transmission processing unit: with upper level equipment or set up with one group of base station equipment respectively and communicate by letter, and the information of carrying out alternately.
6, system according to claim 5 is characterized in that: described transmission processing unit is the wire transmission processing unit.
7, system according to claim 1 is characterized in that, described user terminal comprises:
FDD transmitting set physical layer processing unit: carry out radio communication with the FDD wireless receiver physical layer processing unit of RS, send up interim data to RS;
FDD wireless receiver physical layer processing unit: carry out radio communication with the FDD transmitting set physical layer processing unit of RS, receive the interim data that RS sends;
Wireless data link layer processing unit: to data from FDD wireless receiver physical layer processing unit, do that data receive to be handled and network decoding after, be transmitted to the user; To from user's data, make data sending processing after, be transmitted to FDD transmitting set physical layer processing unit.
8, system according to claim 2 is characterized in that, user terminal comprises:
The first and second FDD transceivers: by first, second FDD wireless receiver physical layer processing unit, first, second FDD transmitting set physical layer processing unit and wireless data link layer processing unit are formed; Wherein:
The one FDD wireless receiver physical layer processing unit: corresponding with the FDD transmitting set physical layer processing unit of BS, receive the partial data that BS sends;
The 2nd FDD wireless receiver is handled physical layer element: corresponding with the FDD wireless transmission physical layer processing unit of RS, receive the interim data that RS sends;
The one FDD transmitting set physical layer processing unit: corresponding with the FDD wireless receiver physical layer processing unit of BS, to BS sending part divided data;
The 2nd FDD transmitting set physical layer processing unit: corresponding with the FDD wireless receiver physical layer processing unit of RS, send interim data to RS;
Wireless data link layer processing unit: to the data from the first and/or the 2nd FDD wireless receiver physical layer processing unit receive handle and network decoding after be transmitted to the user, after sending processing, be transmitted to the first and/or the 2nd FDD transmitting set physical layer processing unit from user's data.
9, system according to claim 2 is characterized in that: RS sends communication data with first frequency received communication data with second frequency; BS and user terminal send communication data with first frequency to RS with the communication data of second frequency reception RS.
10, system according to claim 9, it is characterized in that: described BS also provides the interface with user terminal communication, when the user terminal direct communication under BS and the RS covering, user terminal sends communication data with second frequency to BS, receives the communication data of BS with first frequency.
11, according to each described system in the claim 1,2,4 or 9, it is characterized in that:
When the user terminal direct communication under BS and the RS covering, described BS is by adopting the chnnel coding different with other transmission data and modulation system or different transmitting power with lead code Preamble, frame control head FCH, descending mapping table DL-MAP and up mapping table UL-MAP information directly send to user terminal from this interface, initial ranging Ranging competition slot and bandwidth request competition slot to the sub-frame of uplink of BS, or range finding subchannel Ranging Subchannel, user terminal adopts with the different chnnel coding of other transmission data and directly sends to BS by user terminal with modulation system or different transmitting powers, does not carry out transfer by RS.
12, according to each described system in the claim 1,2,4 or 9, it is characterized in that: the FDD transceiver adopts OFDM to insert the OFDMA mode and communicates.
13, a kind of wireless transfer communication method 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, be respectively applied for definition and pass to descending rotor channel of BS and the OFDMA symbol combination of RS and up rotor channel of BS and the OFDMA symbol combination of passing to BS by RS by BS; Descending rotor channel is set in the sub-frame of uplink of RS physical layer frame structure, be used to define rotor channel and the OFDMA symbol combination that RS receives the descending rotor channel of BS, up rotor channel is set in the descending sub frame of RS physical layer frame structure, is used to define up rotor channel and the OFDMA symbol combination that RS receives BS;
B, the uplink and downlink physical layer frame based on above-mentioned BS and RS between BS, RS and user terminal adopt the FDD mode to carry out the OFDMA wireless transfer communication.
14, method according to claim 13, it is characterized in that, described steps A also comprises: transfer range finding subchannel is set in the sub-frame of uplink of BS physical layer frame structure, and the BS transfer range finding that is used to define the initial access range finding that is used for RS, Perodic ranging, bandwidth request receives subchannel and OFDMA symbol combination;
Transfer range finding is set in the descending sub frame of RS physical layer frame structure sends subchannel, be used to define initial access range finding, the Perodic 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 is corresponding one by one and synchronous.
15, method according to claim 14 is characterized in that: the up transfer range finding subchannel of the sub-frame of uplink of BS also can be used as initial access range finding, Perodic ranging, the bandwidth request range finding subchannel of user terminal and uses.
16, method according to claim 13, it is characterized in that, described steps A also comprises: the descending sub frame head is set in the descending sub frame of BS physical layer frame structure, 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 of OFDMA symbol combination;
The descending sub frame head is set in the sub-frame of uplink of RS physical layer frame structure receives, be used to define descending sub frame chieftain channel and the OFDMA symbol combination that receives the BS physical layer frame structure;
The time-frequency relation that the descending sub frame head of BS physical layer frame structure and the descending sub frame head of RS physical layer frame structure receive is corresponding one by one and synchronous.
17, method according to claim 16, it is characterized in that, the descending sub frame head of described BS physical layer frame structure comprises: lead code Preamble, frame control head FCH, descending mapping table DL-MAP and up mapping table UL-MAP make the user terminal, RS and the BS that belong to BS keep receiving frame synchronous;
The descending sub frame head of described RS physical layer frame structure comprises, lead code Preamble, frame control head FCH, descending mapping table DL-MAP and up mapping table UL-MAP make the user terminal and the RS that belong to RS keep receiving frame synchronous.
18, method according to claim 13 is characterized in that, described steps A also comprises:
The range finding subchannel is set in the sub-frame of uplink of BS physical layer frame structure, is used to define initial access range finding, the Perodic ranging of user terminal, the BS range finding of bandwidth request receives subchannel and OFDMA symbol combination;
Transfer range finding subchannel is set in the sub-frame of uplink of RS physical layer frame structure, is used to define initial access range finding, the Perodic ranging of user terminal, the RS range finding of bandwidth request receives subchannel and OFDMA symbol combination.
19, method according to claim 13 is characterized in that, described steps A also comprises:
The descending sub frame head is set in the descending sub frame of RS physical layer frame structure, 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 descending sub frame and each subchannel of sub-frame of uplink and the position and the using method of OFDMA symbol combination.
20, method according to claim 13 is characterized in that, described steps A also comprises:
When having at least two RS, different descending rotor channels and up rotor channel are set respectively in the BS physical layer frame structure at these at least two RS; The FDD transmitting set of different RS only sends the interim data of BS in corresponding up rotor channel, do not arrange to send the interim data of BS in other subchannel; The FDD 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.
21, according to each described method of claim 13-20, it is characterized in that, 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.
22, method according to claim 21 is characterized in that, described step B also comprises:
During the up rotor channel of BS, the user terminal that belongs to BS is not arranged any transmission subchannel and OFDMA symbol combination, and during the descending rotor channel of BS, the user terminal that belongs to RS is not arranged any transmission subchannel and OFDMA symbol combination.
23, method according to claim 21 is characterized in that, described step B also comprises:
In the sub-frame of uplink of BS physical layer frame structure descending sub frame or RS physical layer frame structure, during descending sub frame head, the reception of descending sub frame head, transfer range finding subchannel and descending rotor channel correspondence, BS transmitter and different RS receiver are by different subchannels and OFDMA symbol combination, share the remainder of BS descending sub frame or RS receiver module sub-frame of uplink, with respectively with the user terminal that belongs to BS with belong to the user terminal communication of RS;
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 descending sub frame head, range finding subchannel, transfer range finding transmission subchannel and up rotor channel, BS receiver and different RS transmitter are by different subchannels and OFDMA symbol combination, share the remainder of RS descending sub frame or BS sub-frame of uplink, with respectively with the user terminal that belongs to BS with belong to the user terminal communication of RS.
24, method according to claim 21 is characterized in that, described step B 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.
25, method according to claim 21 is characterized in that, described step B comprises: during the descending sub frame head of RS, the descending sub frame of other RS is not arranged any transmission subchannel and OFDMA symbol combination; Perhaps, if the descending sub frame head of different RS is overlapping in time, then the descending sub frame head of different RS in time must be fully overlapping and synchronous, and its content must be identical.
26, method according to claim 13, it is characterized in that: the frequency of the sub-frame of uplink of the descending sub frame of BS physical layer frame structure and RS physical layer frame structure is a first frequency, and the frequency of the descending sub frame of the sub-frame of uplink of BS physical layer frame structure and RS physical layer frame structure is a second frequency.
27, a kind of wireless transfer communication method is characterized in that, comprises the following steps:
A, BS send descending interim data and these data of buffer memory in the FDD mode to RS in the descending rotor channel of the descending sub frame of BS; User terminal sends up interim data to RS in the FDD mode 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 these data of buffer memory;
The descending interim data of the described BS that B, RS will receive and the up interim data of user terminal send to described BS and user terminal in the FDD mode after carrying out the network code processing more simultaneously;
Interim data behind the network code that C, described BS and user terminal send described data in buffer and described RS carries out network decoding to be handled, and obtains the up interim data of described user terminal and the descending interim data of BS respectively.
28, method according to claim 27 is characterized in that, described steps A comprises:
A1, 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;
A2, 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 information of descending and up each burst of BS;
A3, BS send descending interim data to RS in the descending rotor channel of descending sub frame, and these data of buffer memory, and RS receives the descending interim data of BS by the descending rotor channel in the sub-frame of uplink of RS.
29, method according to claim 28 is characterized in that, described steps A also comprises:
A4, 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;
A5, 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 the OFDMA symbol combination position and the using method information of descending and up each burst of RS;
A6, user terminal send up interim 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 these data of buffer memory, RS receives the up interim data of user terminal from corresponding OFDM subchannel.
30, method according to claim 29 is characterized in that, described steps A also comprises:
The described corresponding OFDM subchannel of A6 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 A3.
31, method according to claim 27 is characterized in that, the rapid B of institute comprises:
B1, RS carry out network code with the up interim data of the descending interim data of the BS that receives and user terminal to be handled, and obtains the interim data behind the coding;
B2, 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;
B3, 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 information of descending and up each burst of RS;
B4, RS send interim 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 interim data behind this coding from this up rotor channel.
32, method according to claim 31 is characterized in that, described step B1 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.
33, method according to claim 32 is characterized in that, described step C comprises:
Interim data behind the coding that user terminal sends data in buffer and the RS that receives carries out after XOR handles, and obtains the downlink data of BS; Interim data behind the coding that BS sends data in buffer and the described RS that receives carries out after XOR handles, and obtains the up interim data of user terminal.
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| CN200610054861.3A CN101034931B (en) | 2006-03-08 | 2006-03-08 | Radio forwarding communication system and method |
| PCT/CN2007/000730 WO2007101406A1 (en) | 2006-03-08 | 2007-03-07 | Wireless relay communication method and system therefor |
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| CN200610054861.3A CN101034931B (en) | 2006-03-08 | 2006-03-08 | Radio forwarding communication system and method |
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| WO2007101406A1 (en) | 2007-09-13 |
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