CN101175010B - Method and apparatus for multiple relay station cooperation in information non-uniform coding system - Google Patents

Method and apparatus for multiple relay station cooperation in information non-uniform coding system Download PDF

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CN101175010B
CN101175010B CN2006101379078A CN200610137907A CN101175010B CN 101175010 B CN101175010 B CN 101175010B CN 2006101379078 A CN2006101379078 A CN 2006101379078A CN 200610137907 A CN200610137907 A CN 200610137907A CN 101175010 B CN101175010 B CN 101175010B
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data
bit
source node
symbol
information
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CN101175010A (en
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程锦霞
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Beijing Samsung Telecommunications Technology Research Co Ltd
Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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Abstract

A multiple relay stations cooperation method in an information unequal coding system is provided. The wireless communication system of the relay station cooperation consists of at least one source node, a plurality of RS and at least one target node. The method includes steps that the source node collects the channel parameters of all link paths. The source node determines and distributes the data of every participative RS needed to be transmitted. The source node indicates the relative data distribution scheme of every RS. RS extracts and transfers the relative data according to the indication. With the method of the invention, compared with the performance under the condition of not considering the unequal information, the performance of the system is greatly improved.

Description

The method and apparatus of many relay station cooperations in the information non-uniform coding system
Technical field
The present invention relates to communication system, the conveyer of the communication system of particularly a plurality of RS cooperative cooperatings and method.
Background technology
Usually in the wireless communication system based on RS (relay station), one or more RS are used to assist the communication between a pair of node.Above-mentioned situation mainly betides in multi-hop wireless network or the sensing network because in these networks the transmitted power of node and the transmission data limited.
The basic thought of cooperation RS is to utilize the property of wireless medium to increase transmitting step: broadcast characteristic and utilize independent channel to reach diversity.Generally speaking, in cooperation RS system, at first source node 101 broadcast datas are to each cooperation RS node 102, and each RS node 102 is data forwarding to the destination node 103 after handling then, and whole process is as shown in Figure 1.
Fig. 2 has provided a sub-district sketch map based on the RS cooperation with multi-user.Thereby each user utilizes specific resource and other users to distinguish, for example: OFDMA, TDMA or CDMA.
On the traditional sense, when Decode-and-Forward (DF) pattern was adopted by RS, data all need be deciphered by RS, transmit after regenerating again.The main delivery plan that wherein, can utilize includes:
-distributed Space Time Coding (DSTC)
-distributed spatial reuse (DSM)
-distributed Space Time Coding and spatial reuse hybrid plan (DSTC-SM)
But in traditional communication plan, these data that regenerate are sent to each cooperation RS by Random assignment.That is to say, when each RS forwarding information, all again coded data by fair play indistinguishably.
Summary of the invention
Therefore, the purpose of this invention is to provide data distribution device and method between a kind of each RS in using the communication system of a plurality of RS cooperative cooperatings.Utilize the non-impartial characteristic (difference of importance) of coded data thus reasonably distribute the RS resource to guarantee that communication system operates more efficiently; Not only can utilize above-mentioned various transmission plan easily, and take into full account and utilize the otherness of transmitting between the data.
According to one side of the present invention, the method for many relay station cooperations in a kind of information non-uniform coding system, said relay station is assisted
The wireless communication system of doing is made up of at least one source node, a plurality of RS and at least one destination node, comprises step:
A) source node is collected the channel parameter of all links;
B) source node determines and distributes the data of the required transmission of RS of each participation;
C) the corresponding data distribution schemes of source node each RS of indication;
D) RS extracts corresponding data according to indication and transmits.
According to another aspect of the present invention, the system of many relay station cooperations in a kind of information non-uniform coding system comprises:
At least one destination node is used to export last information bit;
At least one source node is collected the channel parameter of all links, determines and distribute the data of the required transmission of RS of each participation, indicates the corresponding data distribution schemes of each RS;
A plurality of RS extract corresponding data and forwarding according to the indication of source node.
Adopt method and device in this patent, the performance of system is with respect to not considering that the performance under the non-impartial situation of information has greatly improved.
Description of drawings
Fig. 1 shows the cooperation communication system that comprises a plurality of RS so far;
Fig. 2 shows an example of single sub-district that the present invention is suitable for;
Fig. 3 shows according to the downlink system block diagram that comprises channel feedback information of the present invention, comprising a base station (BS), and a N RS and a travelling carriage (MS);
Fig. 4 shows structure and the each several part functional schematic according to RS of the present invention;
Fig. 5 shows that according to system of the present invention operational flow diagram comprising BS, the control signaling that is closely related with the present invention between RS and the MS is transmitted;
Fig. 6 shows according to the bit interleaver apparatus structure among the RS of the present invention;
Fig. 7 shows according to the symbol interleaver apparatus structure among the RS of the present invention.
Embodiment
Suppose total N in a certain sub-district 0Individual RS, and the RS of N wherein will choose the participation cooperation.Need preestablish the maximum RS number N that can choose here Max, concrete numerical value need be taken all factors into consideration the complexity and the performance of system design.
Fig. 3 shows based on the downlink system block diagram that comprises channel feedback information of the present invention.BS301 broadcast data and control information 301a are to all effective RS302, and each RS detects and receives signal and regenerate the data forwarding that new data are used for second stage then.All playback of data will and utilize the cooperation between different RS to send according to the data distribution schemes of being advised.At receiving terminal, MS303 will receive the data from different RS302, thereby the receiver 303a of MS utilizes the output of channel detector 303b to detect and merges and forms the output of last information bit.
Fig. 4 has shown according to the structure of RS of the present invention and each several part functional schematic.Fig. 3 and Fig. 4 have described system framework jointly in detail.
By a BS301, realize the present invention common the composition in the system block diagram shown in Figure 3 more than a RS302 and a MS303.Wherein BS301 receives the feedback information 304 from ascending control channel; And be used to indicate RS302 to carry out core algorithm of the present invention according to the control information that above-mentioned feedback information forms down link, be sent to each effective RS302 to down link control information and data 301a through the forms of broadcasting then; Among Fig. 4, RS comprises receiver apparatus (RSReceiver) 401, data regeneration device (Data Regeneration Apparatus) 402 and valid data extraction element (Data Ingestion Apparatus) 403; Wherein thereby receiver 401 is mainly used in reception from the data of BS301 and separate accordingly and be in harmonious proportion decoding and draw information bit; Data regeneration device 402 mainly is to form new retransmission data symbol according to suitable coding and modulation parameter again according to the information data that receiver 401 obtains; It comprises following three parts: channel encoder 404, bit interleaver 405, modulator 406 and symbol interleaver 407; Wherein channel encoder 404 is used for the information bit recompile to receiver 401 outputs, thereby helps forwarding of data; Bit interleaver 405 is mainly used in output bit to channel encoder 404 to carry out bit-level and interweaves, thereby makes error code in the bit-level randomization; Modulator 406 is used for the output bit of bit interleaver 405 to be modulated, thus each significant character that is formed for transmitting; Symbol interleaver 407 is used for output symbol to modulator 406 carries out symbol level and interweaves, thereby makes error code further in the abundant randomization of symbol level; Valid data extraction element 403 mainly is that control information that data symbol and the BS301 according to regeneration sends extracts proper data and via the antenna transmission of this RS; It comprises following two parts: data retransmission forms device (Retransmission DataForming Apparatus) 408 and data distribution device (Data Allocation Apparatus) 409, and wherein the major function of data retransmission formation device 408 is to utilize the output signal of 409 pairs of data regenerating units of data distribution device to carry out the extraction of valid data and form sending symbol.At MS end 303, MS receiver 303a receives from the signal of each RS and merges the last information bit of decoding output.
Fig. 5 shows according to system of the present invention operational flow diagram, comprising control signaling and the key step relevant with the present invention transmitted between BS, RS and MS during stage one and stage two.Comprise:
1.MS501 measure the down channel parameter between i RS (RS_i) 502 and the MS501, and feed back through MS → RS ascending control channel 507 through control signaling DL_Channel Gain_1_i 503;
2.RS_i 502 measure BS → RS_i downlink channel parameters, form control signaling DL_Channel Gain_2_i 504 then and are sent to the BS end through ascending control channel 508, comprising the channel parameter 503 of RS_i → MS link;
When BS505 receive from each effective RS_i (i=1,2 ... N 0) 502 control signaling DL_Channel Gain_2_i 504, BS505 will choose N optimum RS according to certain RS selection criterion and be used for next cooperation transmission;
4. behind optimum N the RS of BS505 decision, the method for BS in according to the present invention determines to be used for the data allocations pattern of N RS and to form control signal Data Allocation_Pattern 505;
5.BS RS502 through BS → RS_i down link 509 broadcast datas and control signaling to above-mentioned N optimum;
6.RS_i502 the descending control signaling that sends according to BS receives, detects the line data regeneration of going forward side by side.RS_i extracts partial data and forms according to Data Allocation_Pattern 505 signalings and sends data forwarding then.Simultaneously, thus Data Allocation_Pattern 505 will be forwarded to MS501 helps the data of MS501 to merge;
7.MS501 receive data and basis from all N cooperation RS502
The data allocations pattern that Data Allocation_Pattern 505 provides is carried out data and is merged detection, and forms final output information bit.
The mutual control signaling that is closely related with the present invention between BS, RS and MS is summed up and is specifically seen the following form:
The control signaling Transmission link Signaling capability
?DL_Channel?Gain_1_i MS→RS The correlated channels parameter of indication RS_i → MS link
?DL_Channel?Gain_2_i RS→BS The correlated channels parameter of indication RS_i → MS and BS → RS_i link
?Data?Allocation_Pattern BS→RS RS→MS The data allocations pattern of indication RS_i → MS link
For ease of further discussing; Set following parameter: in practical application; Because the large scale channel fading parameters is measured easily and is slow with the mobile variation of travelling carriage; Therefore suppose that the DL_Channel Gain_2_i signaling that BS obtains through ascending control channel comprises large scale decline information (can consider path loss and shadow fading simultaneously), promptly supposes h iAnd g iFor the channel gain and the known corresponding large scale power gain of BS-RS_i-MS Radio Link is respectively E{|h i| 2And E{|g i| 2.N RS participates in cooperation and uses identical code rate playback of data.In this application example, consider Turbo code, the code check of BS → RS_i link and RS_i → MS link is used Rate respectively 1And Rate 2Represent.Above-mentioned two stages can be adopted identical code check or different code rate.Here we consider Rate 1=Rate 2The situation of=Rate.
As everyone knows, when adopting Turbo code as chnnel coding, coded-bit is made up of two parts: systematic bits (Systematic Bits) and check bit (Parity Bits).In this application example, imbody of the present invention is following: utilize the big RS_i of path gain → MS link transmission to having deciphered the more systematic bits of important function, and utilize other RS_i → MS link transmission check bit.
In traditional scheme, the coded-bit behind the information bit 610 process Turbo encoders 606 at first gets into bit interleaver 607 and carries out the bit randomization.But, when system's employing is of the present invention, must keep the complete sum independence of systematic bits 604 and check bit 605.As can beappreciated from fig. 6; When employing was of the present invention, the output 601 of the bit interleaver that this is stylish was systematic bits vector
Figure G061D7907820061107D000061
after the randomization 602 and check bit vector
Figure G061D7907820061107D000062
603.They carry out individual interleaving by sub-bit interleaver 1 respectively with sub-bit interleaver 2 609 respectively, thereby obtain and input system bit vectors x s604 with check bit vector x p605 different orders.
Similarly, symbol interleaving also should carry out respectively to above-mentioned two parts bit.As can beappreciated from fig. 7; When employing was of the present invention, the output 701 of this stylish symbol interleaver 707 was system modulation symbolic vector
Figure G061D7907820061107D000063
after the randomization 702 and checking symbol vector
Figure G061D7907820061107D000064
703.The output 601 of bit interleaver is through dividing input system symbolic vector s after the modulator 704 s705 with checking symbol vector s p706, and parallel incoming symbol interleaver 707.Input system symbolic vector s s705 with checking symbol vector s p706 carry out individual interleaving by two sub-symbols interleavers of symbol interleaver 707 respectively, through being output as symbolic vector behind the subsymbol interleaver 1
Figure G061D7907820061107D000065
702, through being output as symbolic vector behind the subsymbol interleaver 2 709
Figure G061D7907820061107D000066
703.
From above-mentioned description, can draw, transmit thereby control signaling Data Allocation_Pattern has indicated the data allocations pattern to make each RS can extract corresponding data.And confirming and need being determined jointly by multiple factor of data allocations pattern mainly comprises:
The number N of cooperation RS
The transmitting coding rate Rate of RS_i and MS link 2
The data transmission scheme that is used for each RS, for example DSTC, DSM or DSTC-SM
Therefore, the step of the present invention's application specifically describes as follows:
BS selects to confirm the suitable data delivery plan according to the N value.
In the 802.16e standard, defined multiple different delivery plan for different transmitting antenna numbers.
After delivery plan was confirmed, BS selected suitable N sIndividual RS is used for the transmission system symbol, and wherein occurrence is by the transmitting coding rate Rate of delivery plan and RS_i and MS link 2Common definite.
Suppose that the path power gain between N RS and MS by descending is:
E { | g K 1 | 2 } > E { | g K 2 | 2 } > · · · > E { | g K N | 2 } . That is to say RS_K i→ MS link provides with respect to RS_K I+1The path gain that → MS link is higher.
According to code rate Rate 2Calculating is used for the minimum RS number N of repeater system symbol S (min), specific algorithm is following:
As definite N S (min)After the value, next need confirm final N according to concrete data transmission scheme sValue.Therefore, the RS that is used for repeater system data and checking data lists respectively as follows:
( RS _ K 1 , · · · , RS _ K N s )
( RS _ K N s + 1 , · · · , RS _ K N )
Here, we provide concrete two examples be used for the explanation how according to code rate Rate 2And delivery plan is confirmed N sValue.
N＝3，Rate 2＝1/3，DSM?scheme
N s = N s ( Min ) = 3 × 1 3 = 1 , So RS_K 1In order to transmission system data, RS_K 2And RS_K 3Be used for the transfer check data.
N＝3，Rate 2＝1/2，DSTC-SM?scheme
Figure G061D7907820061107D000075
Therefore utilize RS_K 1And RS_K 2Form the empty time-code transmission system of distributed Alamouti data, RS_K 3Be used for the transfer check data.
When be useful on the parameter determining of carrying out data distribution schemes after, BS will design control signaling Data Allocation_Pattern according to above-mentioned definite parameter.Thereby the main purpose of this control signaling is in order to make all RS correctly to extract corresponding data and transmit through Data Allocation_Pattern signaling to the concrete data distribution schemes of each RS indication.In practical application, transmitting the needed bit number of this signaling has relation closely with taking which kind of standard.Here, can be exemplified below:
Designator (3 bits) Concrete meaning
000 Totally two RS participate in cooperation, and wherein RS_K1 is used for the transmission system data, and RS_K2 is used for the transfer check data
001 Totally three RS participate in cooperation, and wherein RS_K1 is used for the transmission system data, and RS_K2 and RS_K3 are used for the transfer check data
010 Totally three RS participate in cooperation, and wherein RS_K1 and RS_K2 are used for the transmission system data, and RS_K3 is used for the transfer check data
011 Totally four RS participate in cooperation, and wherein RS_K1 is used for the transmission system data, RS_K2, and RS_K3 and RS_K4 are used for the transfer check number
Certificate
100 Totally four RS participate in cooperation, and wherein RS_K1 and RS_K2 are used for the transmission system data, and RS_K3 and RS_K4 are used for the transfer check data
101 Totally four RS participate in cooperation, RS_K1 wherein, and RS_K2 and RS_K3 are used for the transmission system data, and RS_K4 is used for the transfer check data
110 Reservation bit
111 Reservation bit
Thereby RS need send Data Allocation_Pattern to MS and help MS and correctly merge from the data of different RS and decoding.

Claims (11)

1. the method for many relay stations cooperations in the information non-uniform coding system, the wireless communication system of said relay station cooperation is made up of at least one source node, a plurality of relay station RS and at least one destination node, comprises step:
A) source node is collected the channel parameter of all links;
B) source node determines and distributes the data of the required transmission of RS of each participation;
C) the corresponding data distribution schemes of source node each RS of indication;
D) RS extracts corresponding data according to indication and transmits,
Said a plurality of RS is divided into two groups, and wherein one group of RS is used to transmit important data, and another group RS is used to transmit non-important data.
2. method according to claim 1 is characterized in that the systematic bits in the coded-bit when said significant data comprises the Turbo coding.
3. method according to claim 1 is characterized in that the check bit in the coded-bit when said non-significant data comprises the Turbo coding.
4. method according to claim 1 is characterized in that the RS number in said two groups can be identical or different.
5. method according to claim 1 is characterized in that said step b) comprises:
Confirm the number N of effective RS;
Confirm the forwarding data content of RS;
Confirm the transmitting coding rate and the modulation system of RS and MS link;
Confirm the data transmission scheme of each RS.
6. method according to claim 5 is characterized in that utilizing number N and the code rate Rate of following formula according to effective RS 2Calculating is used for the minimum RS number of repeater system symbol, N and Rate in the following formula 2Between the symbolic representation multiplying:
7. method according to claim 5 is characterized in that the data transmission scheme of said RS comprises one of DSTC, DSM or DSTC-SM.
8. the system of many relay stations cooperations in the information non-uniform coding system comprises:
At least one destination node is used to export last information bit;
At least one source node is collected the channel parameter of all links, determines and distribute the data of the required transmission of relay station RS of each participation, indicates the corresponding data distribution schemes of each RS;
A plurality of RS extract corresponding data and forwarding according to the indication of source node,
Said a plurality of RS is divided into two groups, and wherein one group of RS is used to transmit important data, and another group RS is used to transmit non-important data.
9. system according to claim 8 is characterized in that said RS comprises:
Receiver is used to receive from as the data of the base station BS of source node and decode and decipher;
Data regeneration device forms new retransmission data symbol according to suitable coding and modulation parameter;
Valid data extraction element, the control information of sending according to data symbol and this BS of regeneration extract proper data and through the antenna transmission of receiver.
10. system according to claim 9 is characterized in that said data regeneration device comprises:
Channel encoder is used for the information bit of receiver output is encoded;
Bit interleaver is used for the output bit of channel encoder is carried out Bit Interleave;
Modulator, the output bit that is used for the bit interleaver is modulated;
Symbol interleaver is used for output symbol to modulator and carries out symbol level and interweave.
11. system according to claim 10 is characterized in that said channel encoder is the Turbo encoder.
CN2006101379078A 2006-10-30 2006-10-30 Method and apparatus for multiple relay station cooperation in information non-uniform coding system Expired - Fee Related CN101175010B (en)

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CN101286781B (en) * 2007-04-13 2013-02-27 中兴通讯股份有限公司 Method for terminating connection relation of wireless relay station
KR101527973B1 (en) * 2009-04-27 2015-06-15 엘지전자 주식회사 Method for relaying data and wireless communication system using the same
CN101877883A (en) * 2009-04-30 2010-11-03 中兴通讯股份有限公司 Method and system for realizing relay node cooperation

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CN1607745A (en) * 2003-10-16 2005-04-20 横河电机株式会社 Repeater system
CN1703858A (en) * 2002-10-10 2005-11-30 松下电器产业株式会社 Multi-carrier transmission apparatus and multi-carrier transmission method
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