CN101399801A - Classification method for base station to determine mode for pre-coding matrix selection - Google Patents
Classification method for base station to determine mode for pre-coding matrix selection Download PDFInfo
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- CN101399801A CN101399801A CNA2007101627513A CN200710162751A CN101399801A CN 101399801 A CN101399801 A CN 101399801A CN A2007101627513 A CNA2007101627513 A CN A2007101627513A CN 200710162751 A CN200710162751 A CN 200710162751A CN 101399801 A CN101399801 A CN 101399801A
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Abstract
The invention discloses a classification method for the way of a Node B decision-making selection pre-coding matrix; the invention comprises: step S102, UE reports one or a plurality of PMIs to the Node B; step S104, the Node B judges whether the pre-coding matrix which one or a plurality of PMIs are corresponding to is reliable, the scheduling of the Node B and the channel correlation, and determines the way of the Node B decision-making selection pre-coding matrix according to the judging result; and step S106, the Node B marks the reserved part of a combination indicating bit according to the determined way of the Node B decision-making selection pre-coding matrix and sends the marked combination indicating bit to the UE. The invention can reduce the downlink control signaling overhead, thus effectively improving the system throughput.
Description
Technical field
The present invention relates to the communications field, and especially, relate to a kind of multiple-input, multiple-output (Multiple-Input Multiple-Out-put, MIMO) sorting technique of the mode of base station to determine selection pre-coding matrix in the mobile radio system.
Background technology
On OFDM (OFDM) technological essence is a kind of multi-carrier modulation communication technology, is one of core technology in the 4th third-generation mobile communication.
On frequency domain, the multipath channel of OFDM presents the frequency selective fading characteristic, in order to overcome this decline, channel is divided into a plurality of subchannels on frequency domain, the spectral characteristic of each subchannel is near flat all, each subchannel of OFDM is mutually orthogonal, therefore allows the frequency spectrum of subchannel overlapped, thereby can very big limit land productivity frequency spectrum resource.
In OFDM wireless transmitting system technology,, frequency scheduling can be applied to the transmission of data in order to obtain bigger transfer of data throughput.This is that on such frequency range, each user's channel quality may be different because each user's transmission channel has different frequency domain declines on different frequency ranges.Therefore, utilize frequency domain dispatching just each frequency range can be dispatched to channel condition subscriber equipment preferably, thus the optimization system throughput.
The MIMO technology can increase power system capacity, improves transmission performance, and can merge with other physical-layer techniques well, therefore becomes the key technology of B3G and 4G mobile communication system.But when channel relevancy was very strong, the diversity gain and the spatial multiplexing gain that are brought by multipath channel reduced greatly, can cause declining to a great extent of mimo system performance.Propose a kind of new MIMO method for precoding in recent years, wherein, the precoding processing by the sending and receiving end changes into a plurality of independently pseudo channels with mimo channel, so this method will be a kind of multiplex mode of MIMO efficiently.Because effectively eliminated the influence of channel relevancy, precoding technique has guaranteed the stability of mimo system under various environment.
(Long Term Evolution LTE) is the essential planning of third generation partnership to Long Term Evolution.The simplification that precoding realizes in LTE is handled as follows: at subscriber equipment (UE) and base station (Node B) code book (set of pre-coding matrix) is set, measure down channel by UE, channel matrix is carried out unusual decomposition (SVD), obtain the V matrix, and in code book, seek immediate pre-coding matrix, afterwards with pre-coding matrix index (PrecodingMatrix Indicator, PMI) feed back to NodeB, NodeB seeks corresponding pre-coding matrix according to receiving PMI in code book, use this pre-coding matrix in downlink.
Discuss for the precoding feedback in the LTE standard, the working hypothesis of determining is to be boundary with 2.5M, calculate a PMI less than the 2.5M bandwidth from whole frequency band and feed back to NodeB, if bandwidth is greater than 2.5M, then use PMI of 4/5/6 continuous RB (LTE defines Resource Block, frequency granularity 180kHz/RB) feedback to give NodeB.(this pre-coding matrix that can cause the NodeB emission to be used can not be correctly decoded at the UE end for the call number that prevents the up transmission of UE is different with the call number that NodeB receives, thereby occur makeing mistakes), be necessary very much the precoding codebook that NodeB uses is someways informed UE.
Yet, can produce a problem so again, for the pre-coding matrix that frequency is selected,, each little frequency range NodeB gives UE if transmitting a PMI, and can cause descending control signaling length excessive.For example, suppose bandwidth position 20M, per 5 RB (1M bandwidth) transmit a PMI, and totally 16 of code books need 4 bits to indicate the pre-coding matrix information of selecting, and need the descending expense of 80 bits so altogether.Big like this expense is difficult to accept for the following mobile communcations system that with the raising data rate is main target.
Select pre-coding matrix for Node B, if Node B has different selection strategies, will consider at this and to make Node B abandon the pre-coding matrix that UE reports and select pre-coding matrix in addition, but this only (makes) unavoidable selection according to channel conditions etc., and only be small probability event.Compare full range band precoding feedback, have the research structure simulation result to show, the frequency of 4 * 4 antenna configurations is selected the precoding feedback, and (the 5RB frequency granularity is 180k/RB) than identical time granularity full range band pre-coding system performance high about 5%.As can be seen, NodeB does not accept UE feedback pre-coding matrix and selects the pre-coding matrix of full range band can not bring significant systematic function to descend under small probability.
Therefore, be necessary that the method that takies the signaling consumption of less down link by other informs UE with the PMI that Node B uses.
Summary of the invention
Consider the problems referred to above and make the present invention that for this reason, main purpose of the present invention is to provide a kind of base station to determine to select the classification schemes of the mode of pre-coding matrix, to reduce the descending control signaling expense, improves system throughput.
According to embodiments of the invention, provide a kind of base station to determine to select the sorting technique of the mode of pre-coding matrix.
This method comprises: step S102, and subscriber equipment reports the base station with one or more pre-coding matrix indexes; Step S104, the base station judges whether the pre-coding matrix of one or more pre-coding matrix index correspondences is reliable, and determines that according to the scheduling of judged result and base station and channel relevancy base station to determine selects the mode of pre-coding matrix; And step S106, the base station selects the mode of pre-coding matrix that the predetermined portions that makes up indicating bit is identified according to the decision-making of determining, and the combination indicating bit after will identifying sends to subscriber equipment.
Wherein, base station to determine selects the mode of pre-coding matrix to comprise: accept one or more pre-coding matrix indexes that subscriber equipment sends fully, do not accept one or more pre-coding matrix indexes that subscriber equipment sends and skip one or more pre-coding matrix indexes that subscriber equipment sends fully.
In addition, accept fully in the base station under the situation of one or more pre-coding matrix indexes that subscriber equipment sends, the predetermined portions that indicating bit will be made up in the base station is designated " 00 ".
Do not accept fully in the base station under the situation of one or more pre-coding matrix indexes that subscriber equipment sends, the predetermined portions that indicating bit will be made up in the base station is designated " 01 ".At this moment, this method may further include: employed all pre-coding matrix indexes give the correct time on base station selected subscriber equipment carried out in the last cycle.
At last, skip in the base station under the situation of one or more pre-coding matrix indexes that subscriber equipment sends, the predetermined portions that indicating bit will be made up in the base station is designated " 11 ".In this case, this method may further include, and pre-coding matrix index is reselected in the base station, and the pre-coding matrix index of reselecting is added in the combination indicating bit.
In addition, the predetermined portions of combinations thereof indicating bit is preceding two positions.
In addition, before step S102, further comprise: step S102-2, subscriber equipment decomposes the down channel matrix, obtains the V matrix; And step S102-4, subscriber equipment is searched the pre-coding matrix corresponding with the V matrix in code book, and selects the pre-coding matrix index of the pre-coding matrix find to report the base station.
By technique scheme of the present invention, can reduce the descending control signaling expense, thereby and effectively improve system throughput.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart according to the sorting technique of the mode of the base station to determine selection pre-coding matrix of the embodiment of the invention;
Fig. 2 is the schematic diagram according to combination indicating bit in the sorting technique of the mode of the base station to determine selection pre-coding matrix of the embodiment of the invention; And
Fig. 3 is the flow chart according to the processing example of the sorting technique of the mode of the base station to determine selection pre-coding matrix of the embodiment of the invention.
Embodiment
In the present embodiment, provide a kind of base station (Node B) decision-making to select the sorting technique of the mode of pre-coding matrix.In the method, the processing mode of the PMI that Node B is reported UE is divided into 3 kinds of modes: (1) accepts the PMI of UE report, and just NodeB accepts the PMI of all frequency range correspondences on the frequency band that all UE report it; (2) Node B thinks that according to channel conditions this up transmission is unreliable, can select for use this moment the UE in last cycle to report the PMI weights of all frequency range correspondences on the frequency band of Node B, abandons the PMI emission value that may make mistakes that this UE reports simultaneously; (3) Node B crosses the PMI of UE report, but according to certain accurate survey, for example, according to channel criterion or dispatching criterion etc., pre-coding matrix of alternative from code book, and with this as the precoding emission matrix on the whole frequency band.To describe present embodiment in detail below.
As shown in Figure 1, select the sorting technique of the mode of pre-coding matrix to comprise according to the Node B decision-making of present embodiment: step S102, UE reports Node B with one or more pre-coding matrix indexes (PMI); Step S104, Node B judge whether the pre-coding matrix of one or more PMI correspondences is reliable, and determine that according to the scheduling of judged result and NodeB and channel relevancy Node B decision-making selects the mode of pre-coding matrix; And step S106, Node B selects the mode of pre-coding matrix that the predetermined portions (preferably, can be front two) that makes up indicating bit is identified according to the decision-making of determining, and the combination indicating bit after will identifying sends to UE.
Wherein, Node B decision-making selects the mode of pre-coding matrix to comprise: accept one or more PMI that UE sends fully, do not accept one or more PMI that UE sends and skip one or more PMI that UE sends fully.
Accept fully at Node B under the situation of one or more PMI that UE sends, the predetermined portions that NodeB will make up indicating bit is designated " 00 ".
Do not accept fully at Node B under the situation of one or more PMI that UE sends, the predetermined portions that Node B will make up indicating bit is designated " 01 ".At this moment, this method may further include: employed all PMI give the correct time on Node B selection UE carried out in the last cycle.
At last, skip at Node B under the situation of one or more PMI that UE sends, the predetermined portions that Node B will make up indicating bit is designated " 11 ".In this case, this method may further include, and Node B reselects PMI, and the PMI that reselects is added in the combination indicating bit.
Concrete identification means can be as shown in Figure 2.In Fig. 2, front two bit representation UE accept, do not accept, select else three kinds of modes of code book.In addition, also having kept a kind of indicating mode, in indicating mode, is the PMI information of 4bit (can change for this numeral of different sized codebook) behind two indicating bits.
In addition, before step S102, further comprise: step S102-2, UE decomposes the down channel matrix, obtains the V matrix; And step S102-4, UE searches the pre-coding matrix corresponding with the V matrix in code book, and selects the PMI of the pre-coding matrix find to report Node B.
Below in conjunction with instantiation present embodiment is described.
As shown in Figure 3, be can may further comprise the steps according to the method for present embodiment in specific implementation:
S300, the precoding process of feedback begins;
S301, UE carry out SVD to the down channel matrix and decompose, and seek immediate pre-coding matrix according to the V matrix that decomposes in code book, select PMI;
S302, UE feeds back to NodeB with the PMI that selects by up channel;
S303, NodeB judge the PMI of each frequency range of receiving, if accept the PMI on all frequency ranges of UE report, then execution in step S304; Up transmission is unreliable if NodeB thinks this UE, then execution in step S305; If NodeB crosses the PMI of UE report and selects else and select the PMI code book, then execution in step S306;
S304, NodeB accept the PMI of all frequency ranges of corresponding UE report, and tell UE with (0,0) expression and with this information in the combination indicating bit;
S305, NodeB think that the PMI that UE reports is unreliable, and then NodeB can use on all frequency ranges that last cycle UE reports to NodeB correspondingly, and abandons the PMI indication of this acceptance;
S306, NodeB ignore UE and feed back to its PMI, but use same emission pre-coding matrix and inform UE for the full range band.The PMI indication of 4bit is after two PMI indications;
S307, UE receive NodeB and send to the various acceptance indications of UE and the PMI of full range band, and processing finishes.
In sum, compare with all PMI methods on the existing down link transmission full range band, the present invention is directed to the NodeB decision-making types and adopt 2 bit combinations indication PMI whether to be accepted, can reach the purpose that reduces the descending control signaling expense, improves system throughput by NodeB.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. the sorting technique of the mode of a base station to determine selection pre-coding matrix is characterized in that, comprising:
Step S102, subscriber equipment reports the base station with one or more pre-coding matrix indexes;
Step S104, described base station judges whether the pre-coding matrix of described one or more pre-coding matrix index correspondences is reliable, and according to the scheduling and the channel relevancy of judged result and described base station, determines that described base station to determine selects the mode of pre-coding matrix; And
Step S106, described base station selects the mode of pre-coding matrix that the predetermined portions that makes up indicating bit is identified according to the described decision-making of determining, and the combination indicating bit after will identifying sends to described subscriber equipment.
2. sorting technique according to claim 1, it is characterized in that described base station to determine selects the mode of pre-coding matrix to comprise: described one or more pre-coding matrix indexes of accept described one or more pre-coding matrix indexes of described subscriber equipment transmission fully, not accepting described one or more pre-coding matrix indexes of described subscriber equipment transmission and skip described subscriber equipment transmission fully.
3. sorting technique according to claim 2, it is characterized in that, accept fully in described base station under the situation of described one or more pre-coding matrix indexes that described subscriber equipment sends, described base station is designated " 00 " with the described predetermined portions of described combination indicating bit.
4. sorting technique according to claim 2, it is characterized in that, do not accept fully in described base station under the situation of described one or more pre-coding matrix indexes that described subscriber equipment sends, described base station is designated " 01 " with the described predetermined portions of described combination indicating bit.
5. sorting technique according to claim 4 is characterized in that, further comprises: employed all pre-coding matrix indexes give the correct time on described base station selected described subscriber equipment carried out in the last cycle.
6. sorting technique according to claim 2, it is characterized in that, skip in described base station under the situation of described one or more pre-coding matrix indexes that described subscriber equipment sends, described base station is designated " 11 " with the described predetermined portions of described combination indicating bit.
7. sorting technique according to claim 6 is characterized in that, further comprises, pre-coding matrix index is reselected in described base station, and the described pre-coding matrix index of reselecting is added in the described combination indicating bit.
8. according to each described sorting technique in the claim 3 to 7, it is characterized in that the described predetermined portions of described combination indicating bit is preceding two positions.
9. according to each described sorting technique in the claim 1 to 6, it is characterized in that, before described step S102, further comprise:
Step S102-2, described subscriber equipment decomposes the down channel matrix, obtains the V matrix; And
Step S102-4, described subscriber equipment search in code book and the corresponding pre-coding matrix of described V matrix, and select the pre-coding matrix index of the described pre-coding matrix find to report described base station.
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| CN2007101627513A CN101399801B (en) | 2007-09-30 | 2007-09-30 | Classification method for base station to determine mode for pre-coding matrix selection |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010130097A1 (en) * | 2009-05-14 | 2010-11-18 | 华为技术有限公司 | Information process method, device and system |
| CN102056311A (en) * | 2009-10-30 | 2011-05-11 | 工业和信息化部电信传输研究所 | Base station scheduling method for improving MU-MIMO performance and device |
| CN102291201A (en) * | 2011-08-17 | 2011-12-21 | 东南大学 | Low-complexity codebook searching method of dual-codebook-oriented structure |
| CN102932114A (en) * | 2011-08-12 | 2013-02-13 | 中兴通讯股份有限公司 | Uplink precoding emitting method and device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7609780B2 (en) * | 2004-09-30 | 2009-10-27 | Intel Corporation | Method and apparatus for performing sequential closed loop multiple input multiple output (MIMO) |
| KR20060028989A (en) * | 2004-09-30 | 2006-04-04 | 엘지전자 주식회사 | Method for processing receving signals in mimo system |
| CN100525275C (en) * | 2005-10-27 | 2009-08-05 | 财团法人工业技术研究院 | MIMO OFDM system and precoding and feedback method of it |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010130097A1 (en) * | 2009-05-14 | 2010-11-18 | 华为技术有限公司 | Information process method, device and system |
| US8885747B2 (en) | 2009-05-14 | 2014-11-11 | Huawei Technologies Co., Ltd. | Information processing method, device, and system |
| CN102056311A (en) * | 2009-10-30 | 2011-05-11 | 工业和信息化部电信传输研究所 | Base station scheduling method for improving MU-MIMO performance and device |
| CN102056311B (en) * | 2009-10-30 | 2013-04-17 | 工业和信息化部电信传输研究所 | Base station scheduling method for improving MU-MIMO performance and device |
| CN102932114A (en) * | 2011-08-12 | 2013-02-13 | 中兴通讯股份有限公司 | Uplink precoding emitting method and device |
| CN102932114B (en) * | 2011-08-12 | 2017-02-15 | 中兴通讯股份有限公司 | Uplink precoding emitting method and device |
| CN102291201A (en) * | 2011-08-17 | 2011-12-21 | 东南大学 | Low-complexity codebook searching method of dual-codebook-oriented structure |
| CN102291201B (en) * | 2011-08-17 | 2013-10-30 | 东南大学 | Low-complexity codebook searching method of dual-codebook-oriented structure |
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| CN101399801B (en) | 2011-12-07 |
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