WO2011097881A1 - Procédé et système de renvoi multi-niveau d'informations de canal - Google Patents

Procédé et système de renvoi multi-niveau d'informations de canal Download PDF

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Publication number
WO2011097881A1
WO2011097881A1 PCT/CN2010/077076 CN2010077076W WO2011097881A1 WO 2011097881 A1 WO2011097881 A1 WO 2011097881A1 CN 2010077076 W CN2010077076 W CN 2010077076W WO 2011097881 A1 WO2011097881 A1 WO 2011097881A1
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Prior art keywords
codebook
channel
codeword
information
level
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PCT/CN2010/077076
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English (en)
Chinese (zh)
Inventor
陈艺戬
李儒岳
张峻峰
李书鹏
徐俊
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中兴通讯股份有限公司
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Publication of WO2011097881A1 publication Critical patent/WO2011097881A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0028—Formatting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to a multi-level feedback method and system for channel information. Background technique
  • spatial multiplexing can be used to obtain a higher rate.
  • an enhanced technique is that the receiving end feeds back channel information to the transmitting end, and the transmitting end uses some transmitting precoding techniques according to the obtained channel information, which greatly improves the transmission performance.
  • a simple implementation method is to directly use channel feature vector information for precoding, which is mainly used in single-user MIMO (multiple input multiple output). There are other better but more complex methods, mainly used in multi-user MIMO, but all require more accurate channel information.
  • the feedback of channel information mainly utilizes a simple single codebook feedback method, and the performance of MIMO transmit precoding technology mainly depends on the accuracy of the codebook feedback.
  • the transmitting end and the receiving end jointly save or generate the codebook in real time (same as the transceiver end). For each channel implementation, the receiving end selects a codeword that best matches the channel according to certain criteria, and feeds the codeword sequence number 1 back to the transmitting end.
  • the transmitting end finds the precoding codeword according to the serial number, and obtains channel information, which is mainly feature vector information of the channel.
  • the 3 ⁇ 4 can be further divided into multiple codebooks corresponding to Rank, and each Rank corresponds to a plurality of codewords to quantize the precoding matrix formed by the channel feature vectors under the Rank. Since the number of Rank and non-zero eigenvectors of the channel are equal, in general, the codeword when ank is N will have N columns. So we can divide the codebook 9 into multiple subcodebooks according to Rank. 91
  • the codewords to be stored in Rank>l are in the form of a matrix.
  • the codebook in the LTE protocol is a feedback method using such codebook quantization, as shown in Table 2. It is worth noting that the codebook in Table 2 It is a codebook that is most suitable for single-user MIMO with quantization accuracy and overhead.
  • LTE-Advanced Long Term Evolution Advanced needs to support larger system bandwidth (up to 100MHz) and needs to improve the average spectral efficiency and the frequency error efficiency of cell edge users. Therefore, LTE-A needs to enhance some technologies, such as multi-user MIMO (MU-MIMO), which is an unacceptable task of the feedback accuracy of the existing LTE single-user codebook.
  • MU-MIMO multi-user MIMO
  • SU-MIMO and MU-MIMO share a set of codebooks. Since MU-MIM0 is limited to Rank1, it is stipulated that the feature vector is found only from its corresponding 4-bit codebook according to the codebook feedback method of Rank1. Quantify the codeword and give feedback.
  • One method in the prior art re-designs a set of high-cost codebooks according to the required MU-MIMO codebook overhead, for example: using the 6-bit Rankl codebook in the 802.16m standard, as shown in Table 3.
  • the rank of each row represents a Rankl codebook, for independent high-overhead codebooks such as higher overhead codebooks and high Rank codebooks. Design, the number of codewords grows exponentially, which is a very complicated technical problem, and the compatibility with the original codeword is not good.
  • the drawbacks of the prior art are: Poor compatibility with the LTE protocol.
  • the feedback it is necessary to feed back the PMI information of the SU codebook, and it is necessary to simultaneously feed back the codebook indicating the MU.
  • the MU codebook is 6 bits, then the high Rank requires feedback of lObit codebook information.
  • the receiving end UE needs to store a plurality of code words of multiple sets of codebooks, and performs multiple codebook selections when the codebook is selected, and the calculation amount is large.
  • C is the codebook obtained after the C RS is rotated
  • R H H H
  • H is the dimension xN channel matrix
  • N is the number of receiving antennas, which is the number of transmitting antennas.
  • the distribution information of the feature vector is included in the channel correlation matrix information. After the codeword in the codebook is rotated, the distribution probability of the feature vector is also quantified in a region where the distribution probability is large, and the quantization precision is further improved.
  • the technical problem to be solved by the present invention is to provide a channel information hierarchical feedback method and system with small feedback overhead, good compatibility, flexible feedback combination, low computational complexity when codeword selection is low, and high overall quantization precision.
  • the present invention provides a method for multi-level feedback of channel information, including: receiving, by a receiving end, at least two levels of channel indication information to a transmitting end; The transmitting end acquires channel information according to the channel indication information fed back by the receiving end.
  • the method may further have the following feature: the step of the receiving end feeding back at least two levels of channel indication information to the sending end includes:
  • the M code words of the M-level codebook. . . , 3 ⁇ 4 ⁇ collectively indicate that one channel information is ⁇ ( ⁇ Vietnamese A MS , ⁇ is a function, and the transmitting end is fed back according to the receiving end.
  • the step of the channel indication information acquiring channel information includes: the sending end acquiring channel information according to ⁇ ( ⁇ ⁇ ... ⁇ ⁇ ).
  • the method may also have the following features, the ⁇ being one of the following operations or a combination thereof: left multiplication, right multiplication, dot multiplication, difference, and sum operation.
  • the method may also have the following feature: the m + 1 level codebook +1 is independent of the code word of the mth level codebook
  • the method may further have the following feature: the m+1 level codebook +1 exists at a center, and the +1 includes or does not include the center o m+1 , and the +1 The code word except 1 in the center o m+1 is the same as the distance from the center.
  • the method may further have the following feature: the step of the receiving end feeding back at least two levels of channel indication information to the sending end includes:
  • the receiving end feeds the M-level channel indication information to the transmitting end, where the M>1, the m-th channel indication information corresponds to a codeword Sm of the m-th codebook; wherein, the codeword of the first-level codebook 4
  • the codeword 4 of the Mth codebook indicates a channel information
  • the step of the transmitting end acquiring the channel information according to the channel indication information fed back by the receiving end comprises: the sending end acquiring the channel information according to the codeword A MSM of the Mth-level codebook.
  • the method may further have the following feature: when the F is a mapping relationship, the C bm is a solid Fixed codebook, alignment of multiple codeword information.
  • the method may further have the following feature, when the F is a function relationship, It is a codebook composed of code words distributed around a center.
  • the method may further have the following feature: after receiving the channel indication information of the M codewords 4 ⁇ ... A M , SM , the sending end acquires the channel information according to the m-th channel indication information
  • the codeword d obtains the codebook according to the codebook according to the first-order channel indication information, and acquires the codebook 4 according to the codebook 4 according to the first-order channel indication information;
  • the invention also provides a system for multi-level feedback of channel information, comprising:
  • a receiving end configured to feed back at least two levels of channel indication information to the transmitting end
  • the sending end is configured to acquire channel information according to the channel indication information fed back by the receiving end.
  • the present invention provides a method for multi-level feedback of channel information, including:
  • the receiving end feeds back the M-level channel indication information to the sending end;
  • the transmitting end acquires channel information according to the M-level channel indication information.
  • the feedback from the receiver M-ary channel indicating information to the transmitting side, the M> 1, the m-th channel indicating information corresponding to the m-level codebook of one codeword ⁇ , m l ..M, S m represents a code a m in this codeword index; wherein the first-stage codebook codeword 4 independent information channel can be characterized; in the m-level codebook of m codewords Vietnamese ⁇ m ⁇ indicates a common channel information ⁇ ( ⁇ ] ⁇ Vietnamese A MS , ⁇ is a function, and the transmitting end acquires channel information according to ⁇ (4, Vietnamese U. (Note: The first case)
  • the ⁇ is left multiplication, right multiplication, dot multiplication, difference, and or a combination thereof.
  • the m + 1 level codebook 4 ⁇ is independent of the code word of the mth level codebook 4 ⁇ , the m + 1 level codebook
  • ⁇ +1 has a center +1 , the +1 is an arbitrary matrix or vector, and the 4 ⁇ includes or does not include the center +1 .
  • the m + 1 level codebook ⁇ F (A MSM , C BM ), the F is a mapping relationship or a function relationship, and C 3 ⁇ 4m is a codebook.
  • the F is a mapping relationship
  • the ⁇ is a fixed codebook
  • 4 A C bm corresponding to a plurality of codeword information.
  • the transmitting end After acquiring the channel indication information of the M codewords 4 Sl . . A M ⁇ SM , the transmitting end acquires the codeword 4 ⁇ from the codebook according to the channel indication information of the mth level, according to the codebook ⁇ Get the codebook ⁇ +1 , initially, according to the first-level channel indication information, obtain the codebook according to 4 and the codebook 4 from the codebook 4;
  • the codeword is obtained from the codebook 4 according to the M-level channel indication information fed back by the receiving end.
  • the first level codebook 4 is a codebook specified in a long term evolution system standard protocol; or, the codebook specified in the long term evolution system standard protocol is subjected to a left multiplication matrix.
  • the latter codebook, ie 4 ⁇ D, D is the codebook specified in the Long Term Evolution System standard protocol, and R is the channel correlation matrix.
  • the feedback of the channel characteristic information includes the quantization information capable of independently characterizing the feature vector, indicating the precoding indication (PMI) information of a certain codeword 4 in the primary codebook A and another codeword in the second secondary codebook B.
  • PMI Precoding Indication
  • the first level codebook ⁇ 4 may be any codebook, and the A codebook may further be a codebook specified in the LTE standard protocol, and 4 may further be any codebook specified in the LTE standard protocol 36.211.
  • the first meaning of the feedback is:
  • the first and second feedbacks collectively indicate that one feature vector quantization information is ⁇ (4, ⁇ ), where ⁇ represents a function.
  • the meaning of the feedback is determined jointly by 4 and . to obtain the final eigenvector quantized representation.
  • Different 4 identical indications of different codewords the same 4 different indications of different codewords.
  • ⁇ can represent a variety of functional relationships, such as left multiplication, right multiplication, point multiplication, and difference, or sum, and the combination of various functional relationships, not limited to this.
  • the function ⁇ can be: According to 4 and a function ⁇ get a matrix ⁇ (4), and then use ⁇ (4) to perform left multiplication, right multiplication or dot multiplication operations.
  • the matrix ⁇ (4) may further be a unitary matrix.
  • the ⁇ matrix may further be that the front r column is 4 (r is the Rank number);
  • the function ⁇ can also be:
  • a matrix is obtained, and then 4 is subjected to left multiplication, right multiplication or dot multiplication.
  • the matrix may further be a unitary matrix.
  • the codebook B can exist independently of 4, and there is a clearly indicated center o. When the codebook B does not have a clearly indicated center, it can also find a vector or matrix 0 of the same dimension, such that the distance of the codeword to 0 is the same or 0. Codebook B can contain 0 or not. 0 can be any vector or matrix, and further can have only one matrix or vector of non-zero elements for each column.
  • F may be a mapping relationship; through 4, and the mapping relationship F, can be found in some or all of the codeword from the codebook is defined as C 3 ⁇ 4 part B or all of the code words.
  • C 6 is understood to be a fixed codebook.
  • Each 4 corresponds to a plurality of medium codeword information.
  • RI Rank Indicator
  • 4 may correspond to different sets of code words in C h . That is to say, for different 4, the meaning of the second level feedback is different.
  • F can also be expressed as a functional relationship; according to 4 and codebook C 6 and F can be determined A codebook: 6.
  • 4 is a front r (r is
  • Rank number (It is constructed in the center.
  • the codebook consisting of evenly distributed codewords around.
  • the first-level codebook can be regarded as a basic codebook, and can be independently configured as a feedback mode for feature vector quantization, but the quantization precision is low. However, it can be better suited to SU-MIMO, the second-level codebook, the third-level codebook, and the higher-level codebook can be regarded as an incremental codebook or an accuracy adjustment codebook.
  • the codeword feedback in the codebook B obtained according to 4 can be directly expressed as feature vector quantization information, and in the first case, it must be combined with 4 to represent the accurate feature vector. Quantify information.
  • the first case is a first case:
  • the information represented by the level 3 feedback is a code word in the level 3 codebook B.
  • the meaning of the feedback representation is that the first, second and third levels of feedback together indicate that one feature vector quantization information is r(4, , ⁇ ), where r represents a function.
  • the meaning of the feedback is based on 4, . and jointly determined to obtain the final eigenvector quantized representation. Different identical c p indicate different code words.
  • r can represent a variety of functional relationships, such as left multiplication, right multiplication, point multiplication, and difference, or a combination of sum and operation, not limited to this.
  • the second case is a first case
  • F is a mapping relationship or a function
  • G may be the same as or different from C fc .
  • the feedback frequency of the first 1, 2, 3 or higher feedback may be configured and may be different.
  • the base codebook primary codebook
  • the level 2 and level 3 codebooks can be updated faster because they belong to the codebook fine-tuning, for example, 5ms. Update once.
  • the practice of updating at the same time is not excluded.
  • the base codebook can be used separately, and prior art scheme 1 (ie, independently designing a set of high-overhead codes according to the required MU_MIMO codebook overhead) In this scenario, it is not possible to split a base codebook that can be used separately from a complete codebook.
  • the feedback mode of the present invention can strongly support the SU-MIMO and MU-MIMO dynamic switching transmission modes.
  • the multi-level channel information feedback method provided by the present invention includes:
  • Step 110 Determine a Rank of the channel, and select a corresponding codeword from the codebook corresponding to the Rank value.
  • the first-level codebook uses the LTE codebook in Table 2, or the first-level codebook uses the LTE codebook rotated by the channel correlation matrix in the prior art, and the quantization and feedback method is in the SU-MIMO mode in LTE.
  • the feedback method is the same.
  • a suitable codeword 4 can be selected as the first feature vector from the first-level codebook A according to the principle of maximum chord distance, maximum throughput, or maximum signal-to-interference ratio (SINR). Level quantification.
  • the second level feedback is the PMI information of the codeword in another codebook B.
  • 0 may or may not be included in B.
  • 6> can be selected as a matrix or vector with only one non-zero element in each column.
  • the typical method of 0 is:
  • Step 130 After the base station obtains 4 information and information, the inverse operation T 1 of the rotation in step 120 is performed, and T 1 is determined by the first level feedback information 4 and o.
  • the feature vector information with higher quantization precision can be obtained by the inverse operation.
  • Step 210 Determine a Rank of the channel, and select a corresponding codeword 4 from the codebook corresponding to the Rank value. As level 1 feedback.
  • the first level quantization 4 of the feature vector can be found from the first level codebook A based on the feature vector information g i3 ⁇ 4ctor of the channel matrix.
  • the quantization method and the feedback method are the same as the feedback method in SU-MIMO mode in LTE except that the codebook is different.
  • the first-level codebook uses the LTE codebook in Table 2, or the first-level codebook uses the LTE codebook rotated by the channel correlation matrix in the prior art, that is, the codebook using the left-left LTE is used to obtain a new codebook.
  • R is the channel correlation matrix.
  • Step 220 The second level feedback is PMI information of the codeword in another codebook B.
  • the definition of codebook B and the method for UE selection are as follows: A codeword is found from the second-level codebook B, which may be a fixed rotation matrix of N*N, or may be passed through a A rotation matrix obtained by the function, for example:
  • K ⁇ AM te, (3 ⁇ 4 denotes a multi-column vector orthogonal to 4.
  • the codeword found by the UE is the codeword closest to the feature vector g cto after the left multiplication rotation
  • Step 230 After the base station learns the 4 information, it can obtain the same operation by using the same operation. After the B 3 is rotated by 4, the feature vector information with higher quantization precision can be obtained.
  • Example 3 Step 310 Determine a Rank of the channel, and select a corresponding codeword A t from the codebook corresponding to the Rank as the first level feedback.
  • the first-order quantization 4 of the feature vector is found from the first-order codebook A based on the feature vector information 3 ⁇ 4ctor.
  • the first-level codebook uses the LTE codebook in Table 2, or the first-level codebook uses the LTE codebook rotated by the channel correlation matrix in the prior art, the quantization and feedback method, and the feedback method in the SU-MIMO mode in LTE. the same.
  • Step 320 can find some codebooks B composed of codewords distributed around 4, and then find the feature vector g ecto from B to more accurately represent the codeword.
  • the method is constructed by a baseline codebook 0_ and a 4 joint. For example, construct some centers. Codewords evenly distributed around constitute one codebook c 6. According to 4 and. The relationship determines a matrix R, and R is multiplied by Q_ to obtain a codebook consisting of codewords distributed around 4 in the sentence.
  • Ratio 3 ⁇ 4P, i? HH([l 0 0 0j -U ⁇ A t )) , HH shows Household, which means that the same phase adjustment operation is performed on each element of 4 such that its first element is a real number. This way you can get an R matrix, so that. Selected to 4.
  • Step 330 The base station according to the information of 4 and the specified. And the same R matrix determination method, you can get the codebook B around 4, and find the codeword in it as the final representation of the feature vector.
  • Step 410 Determine a Rank of the channel, and select a corresponding codeword A from the codebook corresponding to the Rank. As level 1 feedback.
  • the UE finds the first level quantization 4 of the feature vector from the first level codebook A according to the feature vector information Eigenvector.
  • the first-level codebook uses the LTE codebook in Table 2, or the first-level codebook uses the LTE codebook rotated by the channel correlation matrix in the prior art, the quantization and feedback method, and the feedback method in the SU-MIMO mode in LTE. the same.
  • Step 420 using the mapping relationship, find (: some codewords corresponding to 4 constitute codebook B, and determine the numbering rule. Find a codeword from B as a representation of the feature vector. And use PMI to perform 5 ; Feedback.
  • codewords corresponding to 4 in the codebook c are found according to 4 and the mapping relationship, and form part of the codebook B or B.
  • B contains N code words that are very close to the 4 strings.
  • N can be a power value of 2, 8, 16, etc.
  • Step 430 After obtaining the first level feedback 4, the base station may use the same mapping relationship to find the codebook.
  • the invention also provides a system for multi-level feedback of channel information, comprising:
  • a receiving end configured to feed back at least two levels of channel indication information to the transmitting end
  • the sending end is configured to acquire channel information according to the channel indication information fed back by the receiving end.
  • the receiving end feedback method and the method for the sending end to obtain the channel information are described in the method embodiment, and details are not described herein again.
  • the present invention can not only solve the problem of feedback accuracy from single-user MIMO to multi-user MIMO, but can also be used to improve the feedback accuracy from single-user MIMO to multi-user MIMO.
  • the invention provides a more flexible feedback of different levels through the combination of the base codebook and the incremental codebook, which can effectively control the feedback overhead and ensure the maximum backward compatibility while improving the overall quantization precision.
  • the advanced codebook can significantly reduce the computational complexity of the codeword based on the design of the previous codebook information.
  • the method for multi-level feedback of channel information provided by the invention has more flexible feedback of different levels through the combination of the basic codebook and the incremental codebook, and controls the feedback overhead while improving the overall quantization precision;
  • the method based on the design of the previous level codebook information significantly reduces the computational complexity of the codeword compared to the independent codebook design in the prior art.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Radio Transmission System (AREA)

Abstract

La présente invention porte sur un procédé de renvoi multi-niveau d'informations de canal. Le procédé comprend les opérations suivantes : le récepteur renvoie des informations d'indication de canal d'au moins deux niveaux à l'émetteur, et l'émetteur acquiert les informations de canal conformément aux informations d'indication de canal renvoyées par le récepteur. La présente invention porte également sur un système de renvoi multi-niveau d'informations de canal. Par renvoi d'informations de canal multi-niveau, la présente invention peut améliorer la précision de renvoi des informations de canal et réduire la complexité de calcul.
PCT/CN2010/077076 2010-02-12 2010-09-17 Procédé et système de renvoi multi-niveau d'informations de canal WO2011097881A1 (fr)

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CN101771514B (zh) * 2010-02-12 2015-06-03 中兴通讯股份有限公司 一种信道信息多级反馈的方法及系统
CN101924585B (zh) * 2010-08-10 2013-10-02 中国科学院计算技术研究所 一种两级码本的构造与信道反馈方法
CN102916768B (zh) * 2012-09-19 2016-06-29 华为技术有限公司 高速专用物理控制信道的反馈方法、装置和系统
CN104753628B (zh) * 2013-12-26 2019-12-10 中兴通讯股份有限公司 一种信道信息反馈方法、系统及基站和终端

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