CN101873160A - Method for reducing feedback quantity during feeding back sequence consisting of a plurality of code words - Google Patents
Method for reducing feedback quantity during feeding back sequence consisting of a plurality of code words Download PDFInfo
- Publication number
- CN101873160A CN101873160A CN201010199245A CN201010199245A CN101873160A CN 101873160 A CN101873160 A CN 101873160A CN 201010199245 A CN201010199245 A CN 201010199245A CN 201010199245 A CN201010199245 A CN 201010199245A CN 101873160 A CN101873160 A CN 101873160A
- Authority
- CN
- China
- Prior art keywords
- sequence
- feedback
- code words
- constitutes
- codeword
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
The feedback quantity during feeding back a code word sequence is reduced by constructing a set with all sequences possibly formed by a plurality of code words and performing feedback by using the sequence number of a to-be-fed code word sequence in the set during feeding back a sequence consisting of the plurality of code words.
Description
Technical field
Present technique relates in the code word reponse system, at the reduction method of feedback data amount, and particularly a kind of method that when the sequence that a plurality of code words of feedback constitute, reduces feedback quantity.
Background technology
In the communication system, become when channel status is, this time-varying characteristics are embodied on the transfer function of channel, cause the stochastic behaviour of channel transfer functions, and promptly channel is presented as a random process to the snap of signal.This randomness of channel can cause signal to distort in transmission course, thereby causes error of transmission.In Modern Communication System, channel is measured and measurement data is carried out feedback processing, be the prediction that realizes the channel stochastic behaviour, and utilize the necessary means of feedback data regulating and controlling transmitting-receiving process.
According to the deployment and the design needs of real network, this feedback may be transmitted by ascending control channel or shared channel.But no matter adopt which kind of mode, can cause huge uplink overhead the feedback information of a plurality of base stations.In order to reduce Release 7, Release 8 standards of the method that the feedback data amount has proposed some compromises: 3GPP at LTE; R1-092530:Required Information at the UE inCoMP; R1-092369:Feedback Design Principles for Downlink CoMP.These methods are come the amount of information of Control and Feedback by the integrated degree that reduces feedback information and quantize precision or feedback information, also promptly obtain the reduction of feedback data amount by the accuracy that reduces feedback information.
In this record, unique user needs to carry out feedback information simultaneously and between a plurality of base station, specifically, the user need with its with a plurality of base stations between adopt the information of each pre-coding matrix when communicating by letter, constitute sequence in a certain order, all feed back to the base station.
In the base station and user side, in store identical precoding codebook respectively.Each pre-coding matrix is corresponding with a code word in the code book.The sum of the pre-coding matrix that can represent in this code book, the code word number that promptly comprises are M.Therefore, when code word adopted binary digit to represent, certain code word of feeding back in this code book needed log
2The M bit.The user needs and will feed back to the base station by a plurality of codeword sequences that constitute in M the code word in feedback procedure.
This feedback information will be in carrying out user's multi-base station cooperative process, as the foundation of each cooperative base station dispatched users and the employed pre-coding matrix of definite transmission.Because pre-coding matrix need want to mate the competence exertion effect with channel, thus the integrated degree of feedback information and and levels of precision be vital to systematic function.Utilize existing feedback scheme, under the situation that guarantees the feedback information accuracy, need the user to feed back fully, need a large amount of overheads; And adopt the scheme of existing reduction feedback quantity, because the integrality of feedback information can't be guaranteed, thereby can cause the decline of systematic function.Consider in the actual deployment the feedback data quantitative limitation, and the requirement that guarantees systematic function, a kind of can guarantee to feed back a plurality of codeword sequence the time feedback method of the low-feedback of feed back full be optimal.
Summary of the invention
The invention provides a kind of low-feedback feedback method that is used for the feedback code sequence, be applicable to the communication system that to feed back a plurality of code words simultaneously.In the present invention, a plurality of code words to be feedback can be arrangement, the combination of a plurality of code words or the sequence that constitutes according to particular requirement.
The technical issues that need to address are how to utilize the least possible feedback data in the present invention, intactly feed back the information that sequence comprised that a plurality of code words constitute.
For addressing the above problem, the present invention has adopted following technical scheme: a kind of when the codeword sequence that a plurality of code words of feedback constitute, reduce the method for feedback quantity.The method includes the steps of:
Step 1, transmitting terminal and receiving terminal in feedback adopt identical set generation method, generate simultaneously to comprise all codeword sequence to be feedback set as code book CB.At the situation of order between needs consideration code word, the element in the code book is the arrangement of code word.For being made of M kind code word, length is the arrangement of L, and the number of the code word arrangements that comprises in the code book is
Wherein
From x element, take out y the number that element is arranged entirely for asking; At the situation that does not need to consider order between code word, the element in the code book is the combination of code word.For being made of M kind code word, length is the combination of L, and the number of the code word combination that comprises in the code book is
Wherein
From x element, take out y the number that element makes up for asking.At the codeword sequence that adopts particular requirement to constitute, do not consider the concrete generation step of its sequence, but need the transmitting terminal of feedback to use identical sequence generating method with receiving terminal.All issuable codeword sequences constitute set CB when adopting this sequence generating method.
Step 2, the element traversal method identical with the receiving terminal employing at the transmitting terminal of feedback travels through CB, and each element wherein is numbered, and forms and the corresponding sequence number c of each codeword sequence.Generally speaking, sequence and sequence number can be shone upon one by one.But sequence and sequence number do not need certain mapping relations one by one that satisfy, and only need satisfy each sequence number and all can corresponding sequence get final product.
Step 3, the transmitting terminal of feedback are found out the sequence number c that a plurality of code words to be feedback constitute sequence correspondence in CB, and it as feedback information, is fed back to the feedback receiving end.
Step 4, the feedback receiving terminal is found out the codeword sequence corresponding with c according to the feedback information c that receives in its local code book CB.
Further, said method also comprises: as code word, when the arrangement that is made of codeword sequence in feedback, combination or the sequence that constitutes according to particular requirement, iteration is utilized the solution of the present invention with codeword sequence.
Description of drawings
Fig. 1 flow chart.
Embodiment
Below in conjunction with the drawings and specific embodiments, the scheme among the present invention is described further.
Core concept of the present invention is to utilize the specifying information of the set CB preservation codeword sequence that is made of whole codeword sequences, is kept at the transmitting terminal and the receiving terminal of feedback respectively.In feedback procedure, only with the sequence number of sequence as feedback information, thereby when guaranteeing codeword sequence information, reduce feedback quantity.
Present embodiment is fed back to example with precoding under the LTE-Advanced CoMP, when feeding back the sequence that is made of a plurality of code words the technical scheme that reduces feedback quantity is described.
In LTE-Advanced CoMP system, travelling carriage (UE) need (Cooperation Set, CS) (Cooperation Point CP) feeds back the priority arrangement of this sub-district when using each pre-coding matrix to each cooperation cell in to cooperation collection.Suppose to have among the CS 3 CP, and the hypothesis code book that is used for feeding back pre-coding matrix is the pre-coding matrix code book that contains 16 code words under the 4 antenna scenes of LTE-R8.UE need represent that these 16 code words are according to using priority arrangement in sequence from big to small to sequence that comprises all 16 code words of each CP feedback.At this moment, M=16, L=16.If feed back fully, UE need be to base station feedback L*log
2The M=64 bit.
Adopt the Limited Feedback technology among the present invention, adopt following steps:
Step 1, in CP and UE side, the full arrangement of using (but being not limited to) dictionary preface method to generate to be made of these 16 code words is as CB.
It is that a precedence relationship stipulated in the character in the given character set that dictionary preface method generates full algorithm thought of arranging, stipulate that on this basis two full priorities of arranging are from left to right to compare the priority of corresponding characters one by one, the next one that generates given full arrangement is arranged, and the next one that generates the full arrangement obtain successively arranges, until generating all full arrangements.So-called one the next one is exactly not have other between this and the next one.This just requires this and the next one that long as far as possible common prefix is arranged, and also promptly changes being limited on the short as far as possible suffix.Thereby,, all possible full arrangement is not had the nothing of repeating enumerate out with omitting for given character set according to the method.The generation method of this full arrangement is a dictionary preface method.
Step 2, according to the sequencing that arrange to generate, successively each arrangement is numbered.In the dictionary preface method, not homotactic sequencing is to decide according to the priority that from left to right compares content in each position successively.
Step 3, UE will need the codeword sequence of a plurality of pre-coding matrix correspondences of feeding back and each element contrast among the CB, find out the numbering c of this codeword sequence in the CB correspondence, and it is fed back to serving BS.
Step 4, base station are searched corresponding with it codeword sequence according to the numbering c that receives in the CB of himself, the codeword sequence of receiving as feedback.
When adopting the numbering of each arrangement of binary digit perfect representation, each feedback data is needs altogether
Bit.
Under the quantity that guarantees feedback information and feedback is consistent fully situation, the method for the present invention's proposition can reduce the feedback data amount greatly.
The embodiment that the present invention is suitable for is not limited only to the precoding reponse system.Can be applied to also that (modulation coding mode is selected (Modulation and Coding Selection, MCS) feedback of information sequence etc. for Channel Quality Indicator, CQI) sequence feedback based on the channel quality indication that quantizes.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 the people of this technology in the disclosed technical scope of the present invention; 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 (6)
1. method that reduces feedback quantity when the sequence that feedback is made of a plurality of code words is characterized in that comprising step in this method bag:
A, the sequence that is made of a plurality of code words to be feedback is formed set CB, the code word number that wherein comprises is [CB], and [X] is the number of element among the set of computations X.
B, traversal CB, and each element wherein is numbered, each codeword sequence corresponding sequence number c obtained
C, at the transmitting terminal of feedback, find out sequence corresponding sequence number c in CB that a plurality of code words to be feedback constitute, and, feed back as feedack;
D, at the feedback receiving terminal, according to the sequence number c that obtains, from CB, obtain the sequence that a plurality of code words constitute.
2. at a kind of method that when feeding back the sequence that constitutes by a plurality of code words, reduces feedback quantity described in the claim 1, it is characterized in that steps A further comprises following three kinds of situations:
A1, consider the situation of order between code word at feedback transmitting terminal and receiving terminal, to adopt the mode of arranging at needs, generate set CB that comprise all full arrangements of being made up of a plurality of code words, the number of the full arrangement of the code word that wherein comprises is at most
Wherein
From x element, take out y the number that element is arranged entirely for asking;
A2, at the situation that does not need to consider order between code word, at feedback transmitting terminal and receiving terminal, adopt the mode of arranging, generate a set CB who comprises all combinations of forming by code word, the number of the combination of the code word that wherein comprises is at most
Wherein
From x element, take out y the number that element makes up for asking;
A3, at the codeword sequence that constitutes according to specific (special) requirements, do not consider the concrete generation step of its sequence, but need the transmitting terminal of feedback to use identical sequence generating method with receiving terminal, be created on when adopting this sequence to generate step, issuable all codeword sequences of a plurality of code words, and constitute set CB.
3. at a kind of method that when feeding back the sequence that constitutes by a plurality of code words, reduces feedback quantity described in the claim 1, it is characterized in that the mode that obtains sequence number among the step B has following feature:
B1, all adopt element in the consistent method traversal CB set in user and base station side, before feedback, obtain with set in the corresponding sequence number of each sequence.
4. at a kind of method that when feeding back the sequence that constitutes by a plurality of code words, reduces feedback quantity described in the claim 3, it is characterized in that the corresponding relation of sequence and sequence number satisfies among the mode C1:
C11, all corresponding sequence of each sequence number;
C12, different sequence number can corresponding identical sequence.
5. at a kind of method that when feeding back the sequence that constitutes by a plurality of code words, reduces feedback quantity described in the claim 1, it is characterized in that when a plurality of codeword sequences need feed back, the method in the claim 1 can iteration be used.
6. at a kind of method that when feeding back the sequence that constitutes by a plurality of code words, reduces feedback quantity described in the claim 5, it is characterized in that the concrete steps that iteration is used are:
A, with each codeword sequence as new code word, all possible sequence that each codeword sequence is constituted constitutes a set CB.The sequence that codeword sequence constitutes can be arrangement, the combination of codeword sequence or the sequence that constitutes according to specific (special) requirements;
B, adopt identical arrangement set generation and traversal method at transmitting terminal and the receiving terminal of feedback;
The sequence that the transmitting terminal of C, feedback constitutes according to codeword sequence to be feedback is found out corresponding with it sequence number c, and this sequence number is fed back in set CB;
The receiving terminal of D, feedback is searched corresponding with it sequence according to the sequence number c that receives in CB, and as feedback result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010199245A CN101873160A (en) | 2010-06-12 | 2010-06-12 | Method for reducing feedback quantity during feeding back sequence consisting of a plurality of code words |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010199245A CN101873160A (en) | 2010-06-12 | 2010-06-12 | Method for reducing feedback quantity during feeding back sequence consisting of a plurality of code words |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101873160A true CN101873160A (en) | 2010-10-27 |
Family
ID=42997843
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010199245A Pending CN101873160A (en) | 2010-06-12 | 2010-06-12 | Method for reducing feedback quantity during feeding back sequence consisting of a plurality of code words |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101873160A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111431667A (en) * | 2017-09-11 | 2020-07-17 | Oppo广东移动通信有限公司 | Resource allocation method, terminal, network device and computer storage medium |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101136718A (en) * | 2006-11-07 | 2008-03-05 | 中兴通讯股份有限公司 | Multi-input multi-output space multiplexing precoding method of wireless communication system |
| US20090147880A1 (en) * | 2006-06-20 | 2009-06-11 | Huawei Technologies Co., Ltd. | Method for reducing feedback information overhead in precoded mimo-ofdm systems |
| CN101499834A (en) * | 2008-01-30 | 2009-08-05 | 华为技术有限公司 | Feedback quantity control method, communication system and related apparatus |
-
2010
- 2010-06-12 CN CN201010199245A patent/CN101873160A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090147880A1 (en) * | 2006-06-20 | 2009-06-11 | Huawei Technologies Co., Ltd. | Method for reducing feedback information overhead in precoded mimo-ofdm systems |
| CN101136718A (en) * | 2006-11-07 | 2008-03-05 | 中兴通讯股份有限公司 | Multi-input multi-output space multiplexing precoding method of wireless communication system |
| CN101499834A (en) * | 2008-01-30 | 2009-08-05 | 华为技术有限公司 | Feedback quantity control method, communication system and related apparatus |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111431667A (en) * | 2017-09-11 | 2020-07-17 | Oppo广东移动通信有限公司 | Resource allocation method, terminal, network device and computer storage medium |
| CN111431667B (en) * | 2017-09-11 | 2023-03-10 | Oppo广东移动通信有限公司 | Resource allocation method, terminal, network device and computer storage medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107359969B (en) | HARQ feedback information transmission method, UE, base station and system | |
| CN101917365B (en) | Method, device and system for configuring codebook | |
| CN106465378B (en) | Method and apparatus for transmitting uplink data | |
| CN101924606B (en) | Method for sending uplink control information on basis of PUSCH transmission and system thereof | |
| CN102771100B (en) | System and method for non-uniform bit allocation in the quantization of channel state vectors | |
| CN101902313B (en) | PUSCH transmission (Physical Uplink Shared Channel) based coding method and system of uplink control information | |
| CN102237969B (en) | Channel state information transmission method and device | |
| CN101969361B (en) | Method and device for transmitting cycle feedback report | |
| CN101917260B (en) | Feedback method and device of channel state information | |
| CN102082625A (en) | Method and device for back feeding multi-carrier channel information | |
| CN102104458B (en) | Method and equipment for transmitting uplink control information | |
| KR101447071B1 (en) | Method and apparatus for processing uci and method for transmission thereof based on mimo system | |
| CN101820335B (en) | A kind of method using secondary code words feeding back channel state information | |
| CN101931513A (en) | Channel state information feedback method and user equipment | |
| CN102696258B (en) | Method for operating communication node and controller | |
| JP5551823B2 (en) | Channel state information feedback | |
| RU2012153165A (en) | SYSTEM AND METHOD FOR ALLOCING TRANSMISSION RESOURCES | |
| CN102237958A (en) | Method and device for reporting CSI (Channel State Information) based on PUCCH (Physical Uplink Control Channel) | |
| RU2587163C2 (en) | Method of transmitting uplink control information | |
| CN101611566B (en) | Apparatus and method for transmitting and receiving forward shared control channel in a mobile communication system | |
| CN102448113A (en) | Method and system for sending periodical channel state information | |
| CN102291225A (en) | Channel state information periodic feedback method and device | |
| CN104662953A (en) | Feedback method and apparatus for channel state information | |
| US8509204B2 (en) | Efficient encoding of control signaling for communication systems with scheduling and link | |
| KR20100081333A (en) | Self-adaptive codebook processing method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20101027 |
|
| WD01 | Invention patent application deemed withdrawn after publication |