CN101958773B - The method of feedback channel information and terminal - Google Patents

Abstract

Translated fromChinese

本发明公开了一种反馈信道信息的方法及终端，该方法包括：终端在物理上行共享信道或物理上行控制信道上反馈信道状态信息，其中，信道状态信息包括：RI、第一码本索引PMI1、第二码本索引PMI2和CQI，在总码本为双码本等效的单码本形式的情况下，PMI2用于指示码本C_PUSCH(r)中的一个码字，码本C_PUSCH(r)由总码本的对应于RI的码本C(r)中，与PMI1对应的一组码字集合中的部分码字所构成；在总码本为双码本形式的情况下，PMI2用于指示码本中的一个码字，其中，码本由总码本的对应于RI的第二码本C²(r)中的部分码字所构成。本发明减小了反馈的开销，提高了系统的性能。

The present invention discloses a method for feeding back channel information and a terminal. The method includes: the terminal feeds back channel state information on a physical uplink shared channel or a physical uplink control channel, wherein the channel state information includes: RI, a first codebook index PMI1 , the second codebook index PMI2 and CQI, in the case that the total codebook is a double codebook equivalent single codebook form, PMI2 is used to indicate a codeword in the codebook C_PUSCH (r), and the codebook C_PUSCH (r) in the codebook C (r) corresponding to RI of total codebook, constitute with the partial codeword in a group of codeword set corresponding to PMI1; In the situation that total codebook is double codebook form, PMI2 is used to indicate the codebook A codeword in , where the codebook It consists of partial codewords in the second codebook C² (r) corresponding to RI of the total codebook. The invention reduces the overhead of feedback and improves the performance of the system.

Description

Translated fromChinese

反馈信道信息的方法及终端Method and terminal for feeding back channel information

技术领域technical field

本发明涉及通信领域，具体而言，涉及一种反馈信道信息的方法及终端。The present invention relates to the communication field, in particular, to a method and a terminal for feeding back channel information.

背景技术Background technique

无线通信系统中，发送端和接收端采取空间复用的方式使用多根天线来获取更高的速率。相对于一般的空间复用方法，一种增强的技术是接收端反馈信道信息给发送端，发送端根据获得的信道信息使用发射预编码技术处理后发射，从而极大的提高了传输性能。对于单用户多输入多输出(Multi-input Multi-output，简称为MIMO)，可以直接使用信道特征矢量信息进行预编码；对于多用户MIMO，则需要比较准确的信道信息。In a wireless communication system, the sending end and the receiving end use multiple antennas to obtain a higher rate by means of spatial multiplexing. Compared with the general spatial multiplexing method, an enhanced technology is that the receiving end feeds back channel information to the sending end, and the sending end uses the transmission precoding technology to process the obtained channel information before transmitting, thus greatly improving the transmission performance. For single-user multiple-input multiple-output (Multi-input Multi-output, MIMO for short), channel feature vector information can be directly used for precoding; for multi-user MIMO, more accurate channel information is required.

在长期演进(Long Term Evolution，简称为LTE)计划中，信道信息的反馈主要是利用较简单的单一码本的反馈方法，而MIMO的发射预编码技术的性能更依赖于其中码本反馈的准确度。基于码本的信道信息量化反馈的基本原理如下：In the Long Term Evolution (referred to as LTE) plan, the feedback of channel information mainly uses a relatively simple single codebook feedback method, and the performance of MIMO transmit precoding technology is more dependent on the accuracy of the codebook feedback. Spend. The basic principles of codebook-based channel information quantization feedback are as follows:

假设有限反馈信道容量为Bbps/Hz，那么可用的码字的个数为N＝2^B个。信道矩阵的特征矢量空间经过量化构成码本空间发射端与接收端共同保存或实时产生此码本(收发端相同)。根据接收端获得的信道矩阵H，接收端根据一定准则从中选择一个与信道最匹配的码字并将码字序号i反馈回发射端。这里，码字序号称为预编码矩阵指示符(Precoding Matrix Indicator，简称为PMI)。发射端根据此序号i找到相应的预编码码字从而获得信道信息，表示了信道的特征矢量信息。Assuming that the limited feedback channel capacity is Bbps/Hz, then the number of available codewords is N=^2B . The eigenvector space of the channel matrix is quantized to form a codebook space The transmitting end and the receiving end jointly store or generate this codebook in real time (the receiving end and the receiving end are the same). According to the channel matrix H obtained by the receiving end, the receiving end uses certain criteria from Choose a code word that best matches the channel And the code word sequence number i is fed back to the transmitting end. Here, the codeword sequence number is called a precoding matrix indicator (Precoding Matrix Indicator, PMI for short). The transmitter finds the corresponding precoding code word according to the sequence number i To obtain channel information, Represents the feature vector information of the channel.

一般来说可以进一步的被划分为多个秩(Rank)对应的码本，每个Rank下会对应多个码字来量化该Rank下信道特征矢量构成的预编码矩阵。由于信道的Rank和非零特征矢量个数是相等的，因此，一般来说Rank为N时的码字都会有N列。所以，码本可按Rank的不同分为多个子码本，如表1所示。Generally speaking It can be further divided into codebooks corresponding to multiple ranks (Rank), and each Rank will correspond to multiple codewords to quantize the precoding matrix formed by the channel feature vectors under the Rank. Since the Rank of the channel is equal to the number of non-zero eigenvectors, generally speaking, when the Rank is N, there will be N columns of codewords. So, the codebook It can be divided into multiple sub-codebooks according to different Ranks, as shown in Table 1.

表1Table 1

其中，在Rank＞1时需要存储的码字都为矩阵形式，其中LTE协议中的码本就是采用的这种码本量化的反馈方法，实际上LTE中预编码码本和信道信息量化码本含义是一样的。在下文中，为了统一起见，矢量也可以看成一个维度为1的矩阵。Among them, when Rank>1, the codewords that need to be stored are all in the form of a matrix. The codebook in the LTE protocol is the feedback method of this codebook quantization. In fact, the precoding codebook and channel information quantization codebook in LTE The meaning is the same. In the following, for the sake of unity, a vector can also be regarded as a matrix with dimension 1.

在具体应用中，LTE的码本反馈方法具体包括以下几个方面：In specific applications, the codebook feedback method of LTE specifically includes the following aspects:

(1)信道信息的反馈粒度。在LTE的标准中，信道信息的最小反馈单位是子带(Subband)信道信息，一个子带由若干个资源块(Resource Block，简称为RB)组成，每个RB由多个资源单元(Resource Element，简称为RE)组成，RE为LTE中时频资源的最小单位，LTE-A中沿用了LTE的资源表示方法。几个Subband可以称为Multi-Subband，很多个Subband可以称为宽带(Wideband)。(1) Feedback granularity of channel information. In the LTE standard, the minimum feedback unit of channel information is subband (Subband) channel information. A subband is composed of several resource blocks (Resource Block, RB for short), and each RB is composed of multiple resource elements (Resource Elements). , referred to as RE), the RE is the smallest unit of time-frequency resources in LTE, and the resource representation method of LTE is used in LTE-A. Several Subbands can be called Multi-Subband, and many Subbands can be called Broadband (Wideband).

(2)信道信息相关的反馈内容。信道状态信息(Channel State Information，简称为CSI)反馈包括：信道质量指示(Channel quality indication，简称为CQI)信息、PMI和秩指示符(Rank Indicator，简称为RI)。这里我们最关注的CSI内容是PMI信息，但RI和CQI也都属于信道状态信息反馈的内容。其中：(2) Feedback content related to channel information. Channel state information (Channel State Information, CSI for short) feedback includes: channel quality indication (Channel quality indication, CQI for short) information, PMI and Rank Indicator (Rank Indicator, RI for short). The CSI content we are most concerned about here is PMI information, but RI and CQI also belong to the content of channel state information feedback. in:

CQI为衡量下行信道质量好坏的一个指标。在36-213协议中CQI用0～15的整数值来表示，分别代表了不同的CQI等级，不同CQI对应着各自的调制方式和编码码率(MCS)。CQI is an index to measure the quality of downlink channel. In the 36-213 protocol, the CQI is represented by an integer value from 0 to 15, which respectively represent different CQI levels, and different CQIs correspond to their respective modulation modes and coding code rates (MCS).

RI用于描述空间独立信道的个数，对应信道响应矩阵的Rank。在开环空间复用和闭环空间复用模式下，需要UE反馈RI信息，其他模式下不需要反馈RI信息。信道矩阵的秩和层数对应。RI is used to describe the number of spatially independent channels, corresponding to the Rank of the channel response matrix. In the open-loop spatial multiplexing and closed-loop spatial multiplexing modes, the UE needs to feed back RI information, and in other modes, it does not need to feed back RI information. The rank of the channel matrix corresponds to the number of layers.

(3)信道信息反馈相关的机制。LTE中的上行信道信息的反馈方式分为两种：物理上行控制信道(Physical Uplink Control Channel，简称为PUCCH)上的周期信道信息反馈和物理上行数据共享信道(Physical Uplink Shared Channel，简称为PUSCH)上的非周期信道信息反馈。PUCCH是控制信道，反馈的可靠性较高，但其反馈资源比较宝贵，反馈开销受到严格的限制。PUSCH可以提供较多的CSI反馈资源，因此可以较好的支持单用户空间复用(SU-MIMO)和多用户空间复用(MU-MIMO)但是可靠性不能保证，且因为要占用数据传输的资源，对数据业务的传输会有一些影响。(3) Mechanism related to channel information feedback. There are two ways to feed back uplink channel information in LTE: periodic channel information feedback on a physical uplink control channel (Physical Uplink Control Channel, referred to as PUCCH) and a physical uplink shared channel (Physical Uplink Shared Channel, referred to as PUSCH) Aperiodic channel information feedback on . PUCCH is a control channel, and the reliability of feedback is relatively high, but its feedback resources are relatively precious, and the feedback overhead is strictly limited. PUSCH can provide more CSI feedback resources, so it can better support single-user spatial multiplexing (SU-MIMO) and multi-user spatial multiplexing (MU-MIMO), but the reliability cannot be guaranteed, and because it takes up data transmission Resources will have some impact on the transmission of data services.

高级长期演进(Long Term Evolution Advanced，简称为LTE-A)系统作为LTE的演进标准，支持更大的系统带宽(最高可达100MHz)，并后向兼容LTE现有的标准。为了获得更高的小区平均谱效率及提高小区边缘的覆盖和吞吐量，LTE-A在现有的LTE系统的基础上，下行最多可以支持8根天线，并且在码本反馈方面提出了一些反馈增强的技术，以便更好的支持MU-MIMO。主要是增强码本的反馈精度和利用信道信息的时间相关性和/或频域相关性压缩开销。该技术能够提高演进的国际移动通信(International MobileTelecommunications-Advance，简称为IMT-Advance)系统的频谱利用率、缓解频谱资源紧缺。同时，考虑到8天线时主要的应用将是双极化的情况，码本的设计和增强也需要充分考虑双极化信道的特征。As an evolution standard of LTE, a Long Term Evolution Advanced (LTE-A for short) system supports a larger system bandwidth (up to 100 MHz) and is backward compatible with existing LTE standards. In order to obtain a higher average spectral efficiency of the cell and improve the coverage and throughput of the cell edge, LTE-A can support up to 8 antennas in the downlink based on the existing LTE system, and some feedbacks have been proposed in the codebook feedback Enhanced technology to better support MU-MIMO. The main purpose is to enhance the feedback accuracy of the codebook and to compress overhead by using the time correlation and/or frequency domain correlation of channel information. The technology can improve the spectrum utilization rate of an evolved International Mobile Telecommunications-Advance (IMT-Advance) system and alleviate the shortage of spectrum resources. At the same time, considering that the main application of 8 antennas will be the case of dual polarization, the design and enhancement of the codebook also need to fully consider the characteristics of the dual polarization channel.

这种增强码本的反馈技术的主要思想是，相对LTE的反馈增大PMI反馈的开销，且利用两个PMI的反馈共同表示信道的状态信息，主要包括两种实现方式：The main idea of this enhanced codebook feedback technology is to increase the overhead of PMI feedback compared to LTE feedback, and to use the feedback of two PMIs to jointly represent the state information of the channel, mainly including two implementation methods:

实现方式一，定义双码本和双PMI反馈，该方式中：Implementation method 1, defining dual codebooks and dual PMI feedback, in this method:

1)一个子带的预编码/反馈的结构由两个矩阵组成。1) The precoding/feedback structure of one subband consists of two matrices.

2)两个矩阵中的每一个矩阵都隶属于一个单独的码本。码本是由基站和UE同时预先知道的。反馈的码字可以在不同的时间和不同的子带上有所变化。2) Each of the two matrices belongs to a separate codebook. The codebook is known in advance by both the base station and the UE. Feedback codewords may vary at different times and in different subbands.

3)一个矩阵表示宽带或者长时信道的属性。另一个矩阵表示确定频带上或者短时信道的属性。3) A matrix representing the properties of wideband or long-term channels. Another matrix represents the properties of channels in certain frequency bands or ephemeral periods.

4)所使用的矩阵码本以有限可数矩阵集的形式表示，并且对UE和基站而言，每个矩阵都是可知的。4) The matrix codebook used is expressed in the form of a finite and countable set of matrices, and each matrix is known to the UE and the base station.

5)其中一个矩阵可以是一个固定的矩阵，不需要反馈。此时相当于退化到单码本反馈(可能在高秩和低秩的非相关信道情况下使用)。5) One of the matrices can be a fixed matrix, requiring no feedback. At this time, it is equivalent to degenerate to single codebook feedback (may be used in the case of high-rank and low-rank uncorrelated channels).

从这里可以看出，信道信息的反馈方面提出了一种基于双码本的结构，进一步可以描述为：It can be seen from this that a structure based on a dual codebook is proposed for the feedback of channel information, which can be further described as:

对于需要反馈信道信息的一个子带或多个联合子带，UE向基站反馈两个PMI信息(某些情况不一定通过反馈，也可以预定义一个PMI为固定值，不进行反馈)，分别为PMI1和PMI2，其中PMI1对应一个码本C1中的码字W1，PMI2对应另外一个码本C2中的码字W2。基站端有相同的C1和C2的信息，收到PMI1和PMI2后从对应的码本C1和C2中找到对应的码字W1和W2，并根据约定的函数规则F，计算W＝F(W1，W2)获得信道信息W。For a subband or multiple joint subbands that need to feed back channel information, the UE feeds back two PMI information to the base station (in some cases, it does not necessarily pass feedback, and a PMI can also be predefined as a fixed value without feedback), respectively. PMI1 and PMI2, where PMI1 corresponds to codeword W1 in one codebook C1, and PMI2 corresponds to codeword W2 in another codebook C2. The base station has the same information of C1 and C2. After receiving PMI1 and PMI2, it finds the corresponding codewords W1 and W2 from the corresponding codebooks C1 and C2, and calculates W=F(W1, W2) Obtain channel information W.

上面的双码本设计准则是LTE-A中的一种具体的码本形式。在具体的实现时，只需要定义W1和W2对应的码本，但实际上存在一个虚拟的W对应的码本，在设计中很多性能方面的考虑都基于W对应的码本来考虑的。The above dual codebook design criterion is a specific codebook form in LTE-A. In specific implementation, only the codebooks corresponding to W1 and W2 need to be defined, but in fact there is a virtual codebook corresponding to W, and many performance considerations in the design are based on the codebook corresponding to W.

实现方式二，定义双码本等效的单码本和双PMI反馈，该方式中：Implementation method 2, defining a dual codebook equivalent single codebook and dual PMI feedback, in this method:

对于Rank＝r，r为整数，与前面的4Tx码本不同的地方在于，在使用该双码本等价的单码本反馈时，反馈对应的码本中的码字需要2个PMI的反馈来表示其信息，双码本等价的单码本一般可以表示为下表2所示。For Rank=r, r is an integer, and the difference from the previous 4Tx codebook is that when using the double codebook equivalent single codebook feedback, the codeword in the corresponding codebook needs 2 PMI feedback To represent its information, the equivalent single codebook of the double codebook can generally be expressed as shown in Table 2 below.

表2Table 2

这里为一个由i₁和i₂共同指示的码字，通常可以写成函数形式W(i₁，i₂)，只需要确定i₁和i₂即可。here is a codeword jointly indicated by i₁ and i₂ , which can usually be written in the functional form W(i₁ , i₂ ), and only i₁ and i₂ need to be determined.

φ_n＝e^jπn/2φ_n = e^jπn/2

例如，r＝1时’定义v_m＝[1 e^j2πm/32 e^j4πm/32 e^j6πm/32]^T，则如表3所示：For example, when r=1, define v_m =[1 e^j2πm/32 e^j4πm/32 e^j6πm/32 ]^T , as shown in Table 3:

表3table 3

该方式实际上和双码本双PMI等价，唯一不同的在于这种方法中不再定义两个码本C1和C2，取而代之的是定义双码本及其函数关系构成的W对应的码本，即实现方式一中的虚拟码本被实际定义从而取代了C1C2。This method is actually equivalent to dual codebooks and dual PMI. The only difference is that in this method, two codebooks C1 and C2 are no longer defined, and instead, the codebook corresponding to W composed of dual codebooks and their functional relationships is defined. , that is, the virtual codebook in the first implementation mode is actually defined to replace C1C2.

由于在LTE-A中，为了更好的支持MU-MIMO的性能，采用的反馈精度增强技术使得反馈PMI1和PMI2的信息需要的开销之和(也可以理解为W对应的码本的开销)相对于LTE中的单码本的开销有较大增加，除此之外，为了增强反馈的粒度，更好的支持MU-MIMO，PUSCH或PUCCH上需要一种新的反馈模式来反馈每个子带的信道信息和CQI信息。由于反馈的码本精度和反馈的粒度都有增强，带来的问题是开销很大，对性能有比较严重的影响。由于反馈开销的增大会影响正常数据业务的传输，因此，这是现有技术中急需解决的一个问题。Since in LTE-A, in order to better support the performance of MU-MIMO, the feedback accuracy enhancement technology adopted makes the sum of the overhead required to feed back the information of PMI1 and PMI2 (it can also be understood as the overhead of the codebook corresponding to W) relatively The overhead of a single codebook in LTE is greatly increased. In addition, in order to enhance the granularity of feedback and better support MU-MIMO, a new feedback mode is required on PUSCH or PUCCH to feed back the information of each subband. Channel information and CQI information. Since both the feedback codebook accuracy and the feedback granularity are enhanced, the problem is that the overhead is very high, which has a serious impact on performance. Since the increase of the feedback overhead will affect the transmission of normal data services, this is a problem that needs to be solved urgently in the prior art.

发明内容Contents of the invention

本发明的主要目的在于提供一种反馈信道信息的方法及终端，以至少解决上述问题。The main purpose of the present invention is to provide a method and terminal for feeding back channel information, so as to at least solve the above problems.

本发明的一个方面提供了一种反馈信道信息的方法，包括：终端在物理上行共享信道或物理上行控制信道上反馈信道状态信息，其中，信道状态信息包括：秩指示信息RI、第一码本索引PMI1、第二码本索引PMI2和信道质量指示CQI，在总码本为双码本等效的单码本形式的情况下，PMI2用于指示码本C_PUSCH(r)中的一个码字，码本C_PUSHC(r)由总码本的对应于RI的码本C(r)中，与PMI1对应的一组码字集合中的部分码字所构成。One aspect of the present invention provides a method for feeding back channel information, including: a terminal feeds back channel state information on a physical uplink shared channel or a physical uplink control channel, wherein the channel state information includes: rank indication information RI, a first codebook Index PMI1, second codebook index PMI2 and channel quality indicator CQI, in the case where the total codebook is a double codebook equivalent single codebook form, PMI2 is used to indicate a codeword in the codebook C_PUSCH (r) , the codebook C_PUSHC (r) is composed of some codewords in a set of codewords corresponding to PMI1 in the codebook C(r) corresponding to RI of the total codebook.

本发明的另一个方面提供了一种反馈信道信息的方法，包括：终端在物理上行共享信道或物理上行控制信道上反馈信道状态信息，其中，信道状态信息包括：RI、第一码本索引PMI1、第二码本索引PMI2和CQI，在总码本为双码本形式的情况下，PMI2用于指示码本中的一个码字，其中，码本由总码本的对应于RI的第二码本C²(r)中的部分码字所构成。Another aspect of the present invention provides a method for feeding back channel information, including: a terminal feeds back channel state information on a physical uplink shared channel or a physical uplink control channel, wherein the channel state information includes: RI, a first codebook index PMI1 , the second codebook index PMI2 and CQI, in the case that the total codebook is in the form of a double codebook, PMI2 is used to indicate the codebook A codeword in , where the codebook It consists of partial codewords in the second codebook C² (r) corresponding to RI of the total codebook.

本发明的又一个方面提供了一种反馈信道信息的方法，包括：终端在物理上行共享信道或物理上行控制信道上反馈信道状态信息，其中，信道状态信息包括：RI、第一码本索引PMI1、第二码本索引PMI2和CQI，PMI2所指示的最小粒度不同于CQI所指示的最小粒度。Another aspect of the present invention provides a method for feeding back channel information, including: a terminal feeds back channel state information on a physical uplink shared channel or a physical uplink control channel, wherein the channel state information includes: RI, a first codebook index PMI1 , the second codebook index PMI2 and CQI, the minimum granularity indicated by PMI2 is different from the minimum granularity indicated by CQI.

本发明的再一个方面提供了一种终端，包括：反馈模块，用于在物理上行共享信道或物理上行控制信道上反馈信道状态信息，其中，信道状态信息包括：RI、第一码本索引PMI1、第二码本索引PMI2和CQI，在总码本为双码本等效的单码本形式的情况下，PMI2用于指示码本C_PUSCH(r)中的一个码字，码本C_PUSCH(r)由总码本的对应于RI的码本C(r)中，与PMI1对应的一组码字集合中的部分码字所构成。Another aspect of the present invention provides a terminal, including: a feedback module, configured to feed back channel state information on a physical uplink shared channel or a physical uplink control channel, wherein the channel state information includes: RI, a first codebook index PMI1 , the second codebook index PMI2 and CQI, in the case where the total codebook is a double codebook equivalent single codebook form, PMI2 is used to indicate a codeword in the codebook C_PUSCH (r), and the codebook C_PUSCH (r) is composed of some codewords in a set of codewords corresponding to PMI1 in the codebook C(r) corresponding to RI of the total codebook.

本发明的再一个方面提供了一种终端，包括：反馈模块，用于在物理上行共享信道或物理上行控制信道上反馈信道状态信息，其中，信道状态信息包括：RI、第一码本索引PMI1、第二码本索引PMI2和CQI，在总码本为双码本形式的情况下，PMI2用于指示码本中的一个码字，其中，码本由总码本的对应于RI的第二码本C²(r)中的部分码字所构成。Another aspect of the present invention provides a terminal, including: a feedback module, configured to feed back channel state information on a physical uplink shared channel or a physical uplink control channel, wherein the channel state information includes: RI, a first codebook index PMI1 , the second codebook index PMI2 and CQI, in the case that the total codebook is in the form of a double codebook, PMI2 is used to indicate the codebook A codeword in , where the codebook It consists of partial codewords in the second codebook C² (r) corresponding to RI of the total codebook.

本发明的再一个方面提供了一种终端，包括：反馈模块，用于在物理上行共享信道或物理上行控制信道上反馈信道状态信息，其中，信道状态信息包括：RI、第一码本索引PMI1、第二码本索引PMI2和CQI，PMI2所指示的最小粒度不同于CQI所指示的最小粒度。Another aspect of the present invention provides a terminal, including: a feedback module, configured to feed back channel state information on a physical uplink shared channel or a physical uplink control channel, wherein the channel state information includes: RI, a first codebook index PMI1 , the second codebook index PMI2 and CQI, the minimum granularity indicated by PMI2 is different from the minimum granularity indicated by CQI.

通过本发明，一方面反馈的PMI2用于指示压缩的码本中的一个码字，由于码本中包含的码字数量被压缩，因此，PMI2的开销相应地减少了，另一方面，PMI2和CQI指示的最小粒度可以不同，从而无需令PMI2和CQI保持相同的反馈粒度，反馈更加灵活，这样，也就无需针对每个子带都反馈PMI2和CQI，从而减小了反馈的开销，解决了相关技术中反馈的码本精度或粒度增强导致开销增大的问题，减小了反馈的开销，提高了系统的性能。Through the present invention, on the one hand, the PMI2 fed back is used to indicate a codeword in the compressed codebook. Since the number of codewords contained in the codebook is compressed, the overhead of PMI2 is correspondingly reduced. On the other hand, PMI2 and The minimum granularity indicated by CQI can be different, so that there is no need to keep PMI2 and CQI at the same feedback granularity, and the feedback is more flexible. In this way, there is no need to feed back PMI2 and CQI for each subband, thereby reducing the feedback overhead and solving the problem of correlation In the technology, the feedback codebook precision or granularity enhancement leads to the problem of increased overhead, which reduces the feedback overhead and improves the system performance.

附图说明Description of drawings

此处所说明的附图用来提供对本发明的进一步理解，构成本申请的一部分，本发明的示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。在附图中：The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

图1是根据本发明实施例的一种反馈信道信息的方法的示意图；FIG. 1 is a schematic diagram of a method for feeding back channel information according to an embodiment of the present invention;

图2是根据本发明实施例的一种终端的结构框图；FIG. 2 is a structural block diagram of a terminal according to an embodiment of the present invention;

图3是根据实施例6的反馈信道信息的方法的示意图；Fig. 3 is a schematic diagram of a method for feeding back channel information according to Embodiment 6;

图4是根据实施例7的反馈信道信息的方法的示意图。Fig. 4 is a schematic diagram of a method for feeding back channel information according to Embodiment 7.

具体实施方式detailed description

下文中将参考附图并结合实施例来详细说明本发明。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。Hereinafter, the present invention will be described in detail with reference to the drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

图1是根据本发明实施例的一种反馈信道信息的方法的示意图，如图1所示，该方法中，终端在物理上行共享信道或物理上行控制信道上反馈信道状态信息(具体地，可以是接收侧终端反馈给发送侧终端)，其中，该信道状态信息包括：RI(以下称RI信息)、第一码本索引PMI1(以下称第一PMI索引信息)、第二码本索引PMI2(以下称第二PMI索引信息)和CQI(以下称CQI信息)，PMI2用于指示对应于该RI的压缩后的码本(以下也称子码本)中的一个码字。FIG. 1 is a schematic diagram of a method for feeding back channel information according to an embodiment of the present invention. As shown in FIG. 1, in this method, the terminal feeds back channel state information on a physical uplink shared channel or a physical uplink control channel (specifically, it may is fed back by the terminal on the receiving side to the terminal on the transmitting side), wherein the channel state information includes: RI (hereinafter referred to as RI information), the first codebook index PMI1 (hereinafter referred to as the first PMI index information), the second codebook index PMI2 ( Hereinafter referred to as second PMI index information) and CQI (hereinafter referred to as CQI information), PMI2 is used to indicate a codeword in the compressed codebook (hereinafter also referred to as sub-codebook) corresponding to the RI.

在PUSCH或PUCCH上反馈时，需要反馈一个宽带的PMI1和多个子带的PMI2，子带的PMI2会占用较大的开销。由于LTE-A的码本的设计侧重与性能保障使用了较大的开销，实际上减少部分码字不会带来性能的显著下降。因此上述方法中，设置通过PMI2指示的码本为经过压缩的码本(例如，可以选取有效的码字构造一个子码本)，这样，在反馈PMI2时可以减少大量开销。When feeding back on the PUSCH or PUCCH, it is necessary to feed back one wideband PMI1 and multiple subband PMI2s, and the subband PMI2s will occupy relatively large overhead. Since the design of the LTE-A codebook focuses on the large overhead and performance guarantee, in fact, reducing some codewords will not bring about a significant decrease in performance. Therefore, in the above method, the codebook indicated by PMI2 is set as a compressed codebook (for example, effective codewords can be selected to construct a sub-codebook), so that a large amount of overhead can be reduced when feeding back PMI2.

需要说明的是，为了减小对现有的码本的改动，可以基于LTE-A中的码本构造一个用于PUSCH或PUCCH中某些传输模式使用的子码本，从而减小反馈PMI2时的开销。It should be noted that, in order to reduce the changes to the existing codebook, a sub-codebook for some transmission modes in PUSCH or PUCCH can be constructed based on the codebook in LTE-A, thereby reducing the time to feed back PMI2 s expenses.

优选地，PMI2所指示的最小粒度可以不同于CQI所指示的最小粒度。该方法中，PMI2和CQI无需保持相同的反馈粒度，反馈更加灵活，这样，也就无需针对每个子带都反馈PMI2和CQI，从而进一步地减小了反馈的开销。Preferably, the minimum granularity indicated by PMI2 may be different from the minimum granularity indicated by CQI. In this method, the PMI2 and CQI do not need to maintain the same feedback granularity, and the feedback is more flexible. In this way, there is no need to feed back the PMI2 and CQI for each subband, thereby further reducing the feedback overhead.

以下对双码本等效单码本和双码本的情况分别进行说明：The following describes the situation that a double codebook is equivalent to a single codebook and a double codebook:

(一)总码本为双码本等效的单码本形式(1) The total codebook is in the form of a single codebook equivalent to a double codebook

PMI2用于指示码本C_PUSCH(r)中的一个码字，其中，码本C_PUSCH(r)由总码本的对应于该RI的码本C(r)中，与上述PMI1对应的一组码字集合中的部分码字所构成。其中，为了便于PMI2指示具体码字，码本C_PUSCH(r)中包含的码字数量可以为码本C(r)中包含的码字数量的1/2或1/4，当然，只要选择部分码字组成C_PUSCH(r)，就可以减小PMI2的指示值，从而减小传递PMI2所用的开销。PMI2 is used to indicate a codeword in the codebook C_PUSCH (r), where the codebook C_PUSCH (r) consists of a codeword corresponding to the above PMI1 in the codebook C(r) corresponding to the RI in the overall codebook It is composed of some codewords in the group codeword set. Among them, in order to facilitate PMI2 to indicate specific codewords, the number of codewords contained in codebook C_PUSCH (r) can be 1/2 or 1/4 of the number of codewords contained in codebook C(r), of course, as long as the selected Part of codewords constitute C_PUSCH (r), which can reduce the indication value of PMI2, thereby reducing the overhead used for transmitting PMI2.

以下通过实施例1-4详细说明总码本为双码本等效的单码本形式的情况下子码本的构成方式，该方式中，第二PMI索引指示RI＝r对应的码本C_PUSCH(r)中，第一PMI索引信息对应的一组码字集合中的一个码字，C_PUSCH(r)为LTE-A中定义的总码本C中RI＝r对应的码本C(r)中第一PMI索引信息对应的一组码字集合中部分码字构成的。The following describes in detail how the sub-codebook is constructed when the total codebook is in the form of a single codebook equivalent to a double-codebook through Embodiments 1-4. In this manner, the second PMI index indicates the codebook C_PUSCH corresponding to RI=r In (r), a codeword in a group of codeword sets corresponding to the first PMI index information, C_PUSCH (r) is the codebook C(r) corresponding to RI=r in the total codebook C defined in LTE-A ) in a set of codewords corresponding to the first PMI index information is composed of some codewords in a set of codewords.

实施例1Example 1

LTE-A的Rank2的双码本等效单码本C(r)如下表4所示：The dual-codebook equivalent single-codebook C(r) of Rank2 of LTE-A is shown in Table 4 below:

表4Table 4

其中φ_n＝e^jπn/2，v_m＝[1 e^j2πm/32 e^j4πm/32 e^j6πm/32]^T。where φ_n =e^jπn/2 , v_m =[1 e^j2πm/32 e^j4πm/32 e^j6πm/32 ]^T .

是一个需要m和n的值确定的矩阵，m，n为整数，m，n与需要反馈的第一索引i₁和第二索引i₂有关。 is a matrix that needs to be determined by the values of m and n, where m and n are integers, and m and n are related to the first index i₁ and the second index i₂ that need to be fed back.

(1)考虑每个subband反馈节约1bit开销，则可以从上面C(r)的16个码字中选择8个码字构成C_PUSCH(r)。(1) Considering that each subband feedback saves 1 bit overhead, then 8 codewords can be selected from the above 16 codewords of C(r) to form C_PUSCH (r).

较佳的，可以是，从上表中Index为0～7的码字矩阵中任选4个码字，从上表中Index为8～15的码字矩阵中任选4个码字共同构成C_PUSCH(r)。Preferably, it may be that 4 codewords are selected from the codeword matrix whose Index is 0-7 in the above table, and 4 codewords are selected from the codeword matrix whose Index is 8-15 in the above table to form together C_PUSCH (r).

较佳的，可以是，从上表中Index为0，2，4，6，8，10，12，14的码字矩阵中任选4个码字，从上表中Index为1，3，5，7，9，11，13，15的码字矩阵中任选4个码字共同构成C_PUSCH(r)。Preferably, it can be that Index is 0, 2, 4, 6, 8, 10, 12, and 14 in the code word matrix from the above table, and Index is 1, 3 from the above table, 4 codewords selected from the codeword matrices of 5, 7, 9, 11, 13, and 15 together form C_PUSCH (r).

从上表中Index为0，1，4，5，8，9，12，13的码字矩阵中任选4个码字，从上表中Index为2，3，6，7，10，11，14，15的码字矩阵中任选4个码字共同构成C_PUSCH(r)。Choose 4 codewords from the codeword matrix whose Index is 0, 1, 4, 5, 8, 9, 12, 13 in the above table, and Index from the above table is 2, 3, 6, 7, 10, 11 , 14, 15 in the codeword matrix, any 4 codewords together constitute C_PUSCH (r).

(2)考虑每个subband反馈节约2bit开销，则可以从上面C(r)的16个码字中选择4个码字构成C_PUSCH(r)。(2) Considering that each subband feedback saves 2-bit overhead, 4 codewords can be selected from the above 16 codewords of C(r) to form C_PUSCH (r).

较佳的，可以是，从上表中Index为0～7的码字矩阵中任选2个码字，从上表中Index为8～15的码字矩阵中任选2个码字共同构成C_PUSCH(r)。Preferably, it may be that two codewords are selected from the codeword matrix whose Index is 0-7 in the above table, and two codewords are selected from the codeword matrix whose Index is 8-15 in the above table to form together C_PUSCH (r).

较佳的，可以是，从上表中Index为0～3的码字矩阵中任选2个码字，从上表中Index为4～7的码字矩阵中任选2个码字共同构成C_PUSCH(r)。Preferably, it may be that two codewords are selected from the codeword matrix whose Index is 0 to 3 in the above table, and two codewords are selected from the codeword matrix whose Index is 4 to 7 in the above table to form together C_PUSCH (r).

例如，C_PUSCH(r)可以如下表5所示：For example, C_PUSCH (r) may be shown in Table 5 below:

表5table 5

即C_PUSCH(r)为C(r)中索引为0，3，4，7，8，11，12，15的8个码字。当然，也可以是C_PUSCH(r)为C(r)中剩余的其它8个码字。That is, C_PUSCH (r) is 8 codewords with indexes 0, 3, 4, 7, 8, 11, 12, and 15 in C (r). Of course, C_PUSCH (r) may also be the remaining 8 codewords in C(r).

例如，C_PUSCH(r)可以如下表6所示：For example, C_PUSCH (r) may be shown in Table 6 below:

表6Table 6

即C_PUSCH(r)为C(r)中索引为0-7的8个码字。当然，也可以是C_PUSCH(r)为C(r)中剩余的其它8个码字。That is, C_PUSCH (r) is 8 codewords with indexes 0-7 in C(r). Of course, C_PUSCH (r) may also be the remaining 8 codewords in C(r).

或者，C_PUSCH(r)可以如下表7所示：Alternatively, C_PUSCH (r) may be as shown in Table 7 below:

表7Table 7

即C_PUSCH(r)为C(r)中索引为0，1，4，5，8，9，12，13的8个码字，当然，也可以是C_PUSCH(r)为C(r)中剩余的其它8个码字。That is, C_PUSCH (r) is the 8 codewords in C(r) whose indexes are 0, 1, 4, 5, 8, 9, 12, and 13. Of course, C_PUSCH (r) can also be C(r) The remaining 8 codewords in .

或者，C_PUSCH(r)可以如下表8所示：Alternatively, C_PUSCH (r) may be as shown in Table 8 below:

表8Table 8

即C_PUSCH(r)为C(r)中索引为0，2，4，6，8，10，12，14的8个码字，当然，也可以是C_PUSCH(r)为C(r)中剩余的其它8个码字。That is, C_PUSCH (r) is the 8 codewords in C(r) whose indexes are 0, 2, 4, 6, 8, 10, 12, and 14. Of course, C_PUSCH (r) can also be C(r) The remaining 8 codewords in .

或者，C_PUSCH(r)可以如下表9所示：Alternatively, C_PUSCH (r) may be as shown in Table 9 below:

表9Table 9

即C_PUSCH(r)为C(r)中索引为0，2，4，6的4个码字。That is, C_PUSCH (r) is the four codewords with indexes 0, 2, 4, and 6 in C (r).

或者C_PUSCH(r)也可以如下表10所示：Or C_PUSCH (r) can also be shown in Table 10 below:

表10Table 10

即C_PUSCH(r)为C(r)中索引为0，1，4，5的4个码字。That is, C_PUSCH (r) is 4 codewords with indexes 0, 1, 4, and 5 in C (r).

或者C_PUSCH(r)可以如下表11所示：Or C_PUSCH (r) can be shown in Table 11 below:

表11Table 11

即C_PUSCH(r)为C(r)中索引为0，3，4，7的4个码字。That is, C_PUSCH (r) is the four codewords with indexes 0, 3, 4, and 7 in C (r).

以上实施例中i₂对应码字的编号规则可以在不改变码本本质的前提下进行变化，抽取实例描述的实施方式主要是根据码字的特征抽取而非编号特征抽取。所述C(r)和C_PUSCH(r)完成码字进行任意列交换、乘以常系数或者所有码字共同进行行交换的变换后所形成的码本与变换前的码本等效。In the above embodiments, the numbering rule of the codeword corresponding to i₂ can be changed without changing the essence of the codebook. The implementation described in the extraction example is mainly based on the feature extraction of the codeword rather than the numbering feature extraction. The codebook formed after the C(r) and C_PUSCH (r) completes any column swapping of codewords, multiplication by constant coefficients, or row swapping of all codewords is equivalent to the codebook before transformation.

实施例2Example 2

LTE-A Rank3的双码本等效单码本C(r)如下表12所示：The double-codebook equivalent single-codebook C(r) of LTE-A Rank3 is shown in Table 12 below:

表12Table 12

其中φ_n＝e^jπn/2，v_m＝[1 e^j2πm/32 e^j4πm/32 e^j6πm/32]^T，是一个需要m，m′，m″的值来确定的矩阵，这些参数与需要反馈的第一索引i₁和第二索引i₂有关。where φ_n = e^jπn/2 , v_m = [1 e^j2πm/32 e^j4πm/32 e^j6πm/32 ]^T , is a matrix that needs to be determined by the values of m, m', m", and these parameters are related to the first index i₁ and the second index i₂ that need to be fed back.

(1)考虑每个subband反馈节约1bit开销，则可以从上面C(r)的16个码字中选择8个码字构成C_PUSCH(r)。(1) Considering that each subband feedback saves 1 bit overhead, then 8 codewords can be selected from the above 16 codewords of C(r) to form C_PUSCH (r).

较佳的，可以是，从上表中Index为0～3的码字矩阵中任选2个码字，从上表中Index为4～7的码字矩阵中任选2个码字，从上表中Index为8～11的码字矩阵中任选2个码字，从上表中Index为12～15的码字矩阵中任选2个码字，共同构成C_PUSCH(r)Preferably, it may be that, from the above table, Index is 0 to 3 in the codeword matrix of 2 codewords, from the above table, Index is 4 to 7 in the codeword matrix of 2 codewords, from Choose 2 codewords from the codeword matrix with Index 8-11 in the above table, and choose 2 codewords from the codeword matrix with Index 12-15 in the above table to form C_PUSCH (r)

(2)考虑每个subband反馈节约2bit开销，则可以从上面C(r)的16个码字中选择8个码字构成C_PUSCH(r)。(2) Considering that each subband feedback saves 2-bit overhead, then 8 codewords can be selected from the above 16 codewords of C(r) to form C_PUSCH (r).

较佳的，可以是，从上表中Index为0～3的码字矩阵中任选1个码字，从上表中Index为4～7的码字矩阵中任选1个码字，从上表中Index为8～11的码字矩阵中任选1个码字，从上表中Index为12～15的码字矩阵中任选1个码字，共同构成C_PUSCH(r)C_PUSCH(r)可以如下表13所示：Preferably, it can be that, from the above table, Index is 0 to 3 in the code word matrix, choose 1 code word, from the above table, Index is 4 to 7 in the code word matrix, choose 1 code word, from Choose one codeword from the codeword matrix with Index 8-11 in the above table, and choose one codeword from the codeword matrix with Index 12-15 in the above table to form C_PUSCH (r)C_PUSCH (r) may be shown in Table 13 below:

表13Table 13

即C_PUSCH(r)为C(r)中索引为0，1，4，5，8，9，12，13的8个码字，当然也可以是C_PUSCH(r)为C(r)中剩余的其它8个码字。That is, C_PUSCH (r) is the 8 codewords whose indexes are 0, 1, 4, 5, 8, 9, 12, and 13 in C (r). Of course, C_PUSCH (r) can also be C (r). The remaining other 8 codewords.

或者C_PUSCH(r)如下表14所示：Or C_PUSCH (r) as shown in Table 14 below:

表14Table 14

即C_PUSCH(r)包括了C(r)中索引为0，1，6，7，8，9，14，15的8个码字，也可以是C_PUSCH(r)为C(r)中剩余的其它8个码字。That is, C_PUSCH (r) includes 8 codewords with indexes 0, 1, 6, 7, 8, 9, 14, and 15 in C (r), or C_PUSCH (r) can be C (r) The remaining other 8 codewords.

或者C_PUSCH(r)为C(r)中索引为0，2，5，7，8，10，13，15的8个码字，当然，也可以是C_PUSCH(r)为C(r)中剩余的其它8个码字。Or C_PUSCH (r) is the 8 codewords with indexes 0, 2, 5, 7, 8, 10, 13, and 15 in C (r). Of course, C_PUSCH (r) can also be C (r) The remaining 8 codewords in .

或者C_PUSCH(r)为C(r)中索引为0，2，4，6，8，10，12，14的8个码字，也可以是C_PUSCH(r)为C(r)中剩余的其它8个码字。Or C_PUSCH (r) is the 8 codewords with indexes 0, 2, 4, 6, 8, 10, 12, and 14 in C (r), or C_PUSCH (r) is the remaining code words in C (r). The other 8 codewords.

或者C_PUSCH(r)为：or C_PUSCH (r) as:

C(r)中索引为0，5，10，15的4个码字。4 codewords with indices 0, 5, 10, 15 in C(r).

C(r)中索引为0，4，8，12的4个码字。4 codewords with indices 0, 4, 8, and 12 in C(r).

C(r)中索引为1，5，9，13的4个码字。4 codewords with indices 1, 5, 9, and 13 in C(r).

C(r)中索引为2，6，10，14的4个码字。4 codewords with indices 2, 6, 10, 14 in C(r).

C(r)中索引为3，7，11，15的4个码字。4 codewords with indexes 3, 7, 11, 15 in C(r).

C(r)中索引为0，5，8，13的4个码字。4 codewords with indices 0, 5, 8, and 13 in C(r).

以上实施例中i₂对应码字的编号规则可以在不改变码本本质的前提下进行变化，抽取实例描述的实施方式主要是根据码字的特征抽取而非编号特征抽取。所述C(r)和C_PUSCH(r)完成码字进行任意列交换、乘以常系数或者所有码字共同进行行交换的变换后所形成的码本与变换前的码本等效。In the above embodiments, the numbering rule of the codeword corresponding to i₂ can be changed without changing the essence of the codebook. The implementation described in the extraction example is mainly based on the feature extraction of the codeword rather than the numbering feature extraction. The codebook formed after the C(r) and C_PUSCH (r) completes any column swapping of codewords, multiplication by constant coefficients, or row swapping of all codewords is equivalent to the codebook before transformation.

实施例3Example 3

LTE-A Rank4的双码本等效单码本C(r)如下表15所示：The double codebook equivalent single codebook C(r) of LTE-A Rank4 is shown in Table 15 below:

表15Table 15

其中φ_n＝e^jπn/2，v_m＝[1 e^j2πm/32 e^j4πm/32 e^j6πm/32]^T。where φ_n =e^jπn/2 , v_m =[1 e^j2πm/32 e^j4πm/32 e^j6πm/32 ]^T .

是一个需要m，m′，n的值来确定的矩阵，这些参数与需要反馈的第一索引i₁和第二索引i₂有关。 is a matrix that needs to be determined by the values of m, m', n, and these parameters are related to the first index i₁ and the second index i₂ that need to be fed back.

(1)考虑节约1bit的开销：(1) Consider saving 1 bit overhead:

C_PUSCH(r)为C(r)中索引为0，2，4，6的4个码字或其它4个码字。C_PUSCH (r) is the 4 codewords with indexes 0, 2, 4, 6 or other 4 codewords in C(r).

C_PUSCH(r)为C(r)中索引为0，3，4，7的4个码字或其它4个码字。C_PUSCH (r) is the 4 codewords with indexes 0, 3, 4, 7 or other 4 codewords in C(r).

C_PUSCH(r)为C(r)中索引为0，1，4，5的4个码字或其它4个码字。C_PUSCH (r) is the 4 codewords whose indexes are 0, 1, 4, 5 or other 4 codewords in C(r).

实施例4Example 4

LTE-A Rank1的双码本等效单码本C(r)如下表16所示：The dual-codebook equivalent single-codebook C(r) of LTE-A Rank1 is shown in Table 16 below:

表16Table 16

其中φ_n＝e^jπn/2，v_m＝[1 e^j2πm/32 e^j4πm/32 e^j6πm/32]^T.是一个需要m和n的值确定的矩阵，m，n为整数，m，n与需要反馈的第一索引i₁和第二索引i₂有关。where φ_n = e^jπn/2 , v_m = [1 e^j2πm/32 e^j4πm/32 e^j6πm/32 ]^T . is a matrix that needs to be determined by the values of m and n, where m and n are integers, and m and n are related to the first index i₁ and the second index i₂ that need to be fed back.

C_PUSCH(r)为C(r)中索引为0，2，4，6，8，10，12，14中的任意4个码字和索引为1，3，5，7，9，11，13，15中的任意4个码字构成的码本。C_PUSCH (r) is any 4 codewords in C(r) with indexes 0, 2, 4, 6, 8, 10, 12, 14 and indexes 1, 3, 5, 7, 9, 11, A codebook composed of any four codewords in 13 and 15.

进一步的可以是C_PUSCH(r)为C(r)中索引为0，4，8，12，中的任意2个码字和索引为2，6，10，14中的任意2个码字，索引为1，5，9，13中的任意2个码字，索引为3，7，11，15中的任意2个码字构成的码本。Further, C_PUSCH (r) may be any 2 codewords with indexes 0, 4, 8, 12 in C(r) and any 2 codewords with indexes 2, 6, 10, 14, The index is any 2 codewords among 1, 5, 9, and 13, and the codebook is composed of any 2 codewords among 3, 7, 11, and 15.

还可以是C_PUSCH(r)为C(r)中索引Index0，1，2，3，8，9，10，11的8个码字构成的码本，或其它8个码字构成的码本。It can also be that C_PUSCH (r) is a codebook composed of 8 codewords with indexes Index0, 1, 2, 3, 8, 9, 10, and 11 in C(r), or a codebook composed of other 8 codewords .

还可以是C_PUSCH(r)为C(r)中索引为0～7中的任意4个码字和索引为8～15中的任意4个码字构成的码本。It may also be that C_PUSCH (r) is a codebook composed of any 4 codewords with indexes 0-7 and any 4 codewords with indexes 8-15 in C(r).

进一步的可以是C_PUSCH(r)为C(r)中索引为0～3，中的任意2个码字和索引为4～7中的任意2个码字，索引为8～11中的任意2个码字，索引为12～15中的任意2个码字共同构成的码本。Further, C_PUSCH (r) can be any 2 codewords in C(r) whose index is 0-3, and any 2 codewords whose index is 4-7, and whose index is any of 8-11. 2 codewords, the index is a codebook jointly formed by any 2 codewords from 12 to 15.

(二)总码本为双码本形式(2) The total codebook is in the form of a double codebook

PMI2用于指示码本中的一个码字，其中，码本由总码本的对应于RI的第二码本C²(r)中的部分码字所构成。其中，为了便于PMI2指示具体码字，码本中包含的码字数量可以为第二码本C²(r)中包含的码字数量的1/2或1/4，当然，只要选择部分码字组成就可以减小PMI2的指示值，从而减小传递PMI2所用的开销。PMI2 is used to indicate the codebook A codeword in , where the codebook It consists of partial codewords in the second codebook C² (r) corresponding to RI of the total codebook. Among them, in order to facilitate PMI2 to indicate specific codewords, the codebook The number of codewords contained in can be 1/2 or 1/4 of the number of codewords contained in the second codebook C² (r), of course, as long as some codewords are selected to form The indication value of PMI2 can be reduced, thereby reducing the overhead used for transmitting PMI2.

以下通过实施例5详细说明总码本为双码本形式的情况下子码本的构成方式，该方式中，第二PMI索引指示第二码本中RI＝r的时码本中的一个码字，所述为LTE-A中定义的总码本C中RI＝r对应的码本C²(r)中部分码字构成的。The following describes in detail how the sub-codebook is constructed when the total codebook is in the form of a dual codebook through Embodiment 5. In this way, the second PMI index indicates the time codebook of RI=r in the second codebook A code word in the It is composed of some codewords in the codebook C² (r) corresponding to RI=r in the total codebook C defined in LTE-A.

实施例5Example 5

如LTE-A Rank2码本也可以用以下双码本的方式实现，表示为C¹(r)和C²(r)两个码本，PMI 1指示C¹(r)中的一个码字，PMI2指示C²(r)中的一个码字，两个码字通过一个规定的函数共同表示信道信息，如乘积函数。For example, the LTE-A Rank2 codebook can also be implemented in the following dual codebook manner, expressed as two codebooks C¹ (r) and C² (r), and PMI 1 indicates a codeword in C¹ (r), PMI2 indicates a codeword in C² (r), and the two codewords jointly represent channel information through a specified function, such as a product function.

C¹(r)(W1对应的码本)由m₁个码字W₁^(k)构成C¹ (r) (the codebook corresponding to W1) consists of m₁ codewords W₁^(k)

${\mathrm{<span><span>X</span>x</span>}}^{<span><span>(</span>(</span>\mathrm{<span><span>k</span>k</span>}<span><span>)</span>)</span>}<span><span>\&Element;</span>\&Element;</span><span><span>\{</span>\{</span>\left[\begin{array}{cccc}{\mathrm{<span><span>b</span>b</span>}}_{<span><span>(</span>(</span>\frac{{\mathrm{<span><span>N</span>N</span>}}_{\mathrm{<span><span>b</span>b</span>}}}{\mathrm{<span><span>2</span>2</span>}}\mathrm{<span><span>k</span>k</span>}<span><span>)</span>)</span>\mathrm{<span><span>mod</span>mod</span>}\mathrm{<span><span>N</span>N</span>}}& {\mathrm{<span><span>b</span>b</span>}}_{<span><span>(</span>(</span>\frac{{\mathrm{<span><span>N</span>N</span>}}_{\mathrm{<span><span>b</span>b</span>}}}{\mathrm{<span><span>2</span>2</span>}}\mathrm{<span><span>k</span>k</span>}<span><span>+</span>+</span>\mathrm{<span><span>1</span>1</span>}<span><span>)</span>)</span>\mathrm{<span><span>mod</span>mod</span>}\mathrm{<span><span>N</span>N</span>}}& <span><span>.</span>.</span><span><span>.</span>.</span><span><span>.</span>.</span>& {\mathrm{<span><span>b</span>b</span>}}_{<span><span>(</span>(</span>\frac{{\mathrm{<span><span>N</span>N</span>}}_{\mathrm{<span><span>b</span>b</span>}}}{\mathrm{<span><span>2</span>2</span>}}\mathrm{<span><span>k</span>k</span>}<span><span>+</span>+</span>{\mathrm{<span><span>N</span>N</span>}}_{\mathrm{<span><span>b</span>b</span>}}<span><span>-</span>-</span>\mathrm{<span><span>1</span>1</span>}<span><span>)</span>)</span>\mathrm{<span><span>mod</span>mod</span>}\mathrm{<span><span>N</span>N</span>}}\end{array}\right]<span><span>:</span>:</span>\mathrm{<span><span>k</span>k</span>}<span><span>=</span>=</span>\mathrm{<span><span>0,1</span>0,1</span>}<span><span>,</span>,</span><span><span>.</span>.</span><span><span>.</span>.</span><span><span>.</span>.</span><span><span>,</span>,</span>{\mathrm{<span><span>m</span>m</span>}}_{\mathrm{<span><span>1</span>1</span>}}<span><span>-</span>-</span>\mathrm{<span><span>1</span>1</span>}<span><span>\}</span>\}</span>$

${W_1}^{\left(k\right)}=\left[\begin{array}{cc}{X}^{\left(k\right)}& 0\\ 0& X^{\left(k\right)}\end{array}\right],$C₁＝{W₁⁽⁰⁾，W₁⁽¹⁾，W₁⁽²⁾，…，W₁^(2N/Nb-1)}${W_1}^{\left(k\right)}=\left[\begin{array}{cc}{x}^{\left(k\right)}& 0\\ 0& x^{\left(k\right)}\end{array}\right],$ C₁ ＝{W₁⁽⁰⁾ ，W₁⁽¹⁾ ，W₁⁽²⁾ ，…，W₁^(2N/Nb-1) }

N_b为矩阵X^(k)的列数，b_i为一个矢量，比如典型的为DFT矢量(但不限于这种情况)，一共有N个基本矢量b₀～b_N-1，进一步的描述为： N_b is the number of columns of the matrix X^(k) , b_i is a vector, such as a typical DFT vector (but not limited to this case), there are a total of N basic vectors b₀ ~b_N-1 , further description for:

B＝[b₀ b₁ … b_N-1]，${\left[B\right]}_{1+m,1+n}=e^{j\frac{2\mathrm{\&pi;mn}}{N}},$m＝0，1，…，n＝0，1，…，N-1B=[b₀ b₁ ... b_N-1 ],${\left[B\right]}_{1+m,1+\mathrm{no}}=e^{j\frac{2\mathrm{\&pi;mn}}{N}},$ m=0,1,..., n=0,1,...,N-1

其中，N_tx为与矢量的维度相关的一个参数，通常指发射天线数。N为2的整数次方。N_tx＝8，N_b＝4，N＝32，包含的16个码字为：Wherein, N_tx is a parameter related to the dimension of the vector, and generally refers to the number of transmitting antennas. N is an integer power of 2._Ntx = 8,_Nb = 4, N = 32, The 16 codewords included are:

${W_1}^{\left(k\right)}=\left[\begin{array}{cc}{X}^{\left(k\right)}& 0\\ 0& X^{\left(k\right)}\end{array}\right],$C₁＝{W₁⁽⁰⁾，W₁⁽¹⁾，W₁⁽²⁾，…，W₁⁽¹⁵⁾}${W_1}^{\left(k\right)}=\left[\begin{array}{cc}{x}^{\left(k\right)}& 0\\ 0& x^{\left(k\right)}\end{array}\right],$ C₁ ＝{W₁⁽⁰⁾ ，W₁⁽¹⁾ ，W₁⁽²⁾ ，…，W₁⁽¹⁵⁾ }

X⁽⁰⁾＝[b₀ b₁ … b₃] X⁽¹⁾＝[b₂ b₃ … b₅] X⁽²⁾＝[b₄ b₅ … b₇] ......X⁽¹⁴⁾＝[b₂₈b₂₉ … b₃₁] X⁽¹⁵⁾＝[b₃₀ b₃₁ b₁ b₂]X⁽⁰⁾ = [b₀ b₁ ... b₃ ] X⁽¹⁾ = [b₂ b₃ ... b₅ ] X⁽²⁾ = [b₄ b₅ ... b₇ ] ... X^{( 14)} =[b₂₈ b₂₉ ... b₃₁ ] X⁽¹⁵⁾ =[b₃₀ b₃₁ b₁ b₂ ]

C²(r)(W2对应的码本)由m₂个码字构成，Rank2时其中包含C² (r) (the codebook corresponding to W2) consists of m₂ codewords, which contains

${\mathrm{<span><span>C</span>C</span>}}^{\mathrm{<span><span>2</span>2</span>}}<span><span>=</span>=</span><span><span>\{</span>\{</span>\frac{\mathrm{<span><span>1</span>1</span>}}{\sqrt{\mathrm{<span><span>2</span>2</span>}}}\left[\begin{array}{cc}{\mathrm{<span><span>Y</span>Y</span>}}_{\mathrm{<span><span>1</span>1</span>}}& {\mathrm{<span><span>Y</span>Y</span>}}_{\mathrm{<span><span>2</span>2</span>}}\\ {\mathrm{<span><span>Y</span>Y</span>}}_{\mathrm{<span><span>1</span>1</span>}}& {<span><span>-</span>-</span>\mathrm{<span><span>Y</span>Y</span>}}_{\mathrm{<span><span>2</span>2</span>}}\end{array}\right]<span><span>,</span>,</span>\frac{\mathrm{<span><span>1</span>1</span>}}{\sqrt{\mathrm{<span><span>2</span>2</span>}}}\left[\begin{array}{cc}{\mathrm{<span><span>Y</span>Y</span>}}_{\mathrm{<span><span>1</span>1</span>}}& {\mathrm{<span><span>Y</span>Y</span>}}_{\mathrm{<span><span>2</span>2</span>}}\\ {\mathrm{<span><span>jY</span>J</span>}}_{\mathrm{<span><span>1</span>1</span>}}& {<span><span>-</span>-</span>\mathrm{<span><span>jY</span>J</span>}}_{\mathrm{<span><span>2</span>2</span>}}\end{array}\right]<span><span>\}</span>\}</span>$

$<span><span>(</span>(</span>{\mathrm{<span><span>Y</span>Y</span>}}_{\mathrm{<span><span>1</span>1</span>}}<span><span>,</span>,</span>{\mathrm{<span><span>Y</span>Y</span>}}_{\mathrm{<span><span>2</span>2</span>}}<span><span>)</span>)</span><span><span>\&Element;</span>\&Element;</span><span><span>\{</span>\{</span><span><span>(</span>(</span>{\stackrel{<span><span>~</span>~</span>}{\mathrm{<span><span>e</span>e</span>}}}_{\mathrm{<span><span>1</span>1</span>}}<span><span>,</span>,</span>{\stackrel{<span><span>~</span>~</span>}{\mathrm{<span><span>e</span>e</span>}}}_{\mathrm{<span><span>1</span>1</span>}}<span><span>)</span>)</span><span><span>,</span>,</span><span><span>(</span>(</span>{\stackrel{<span><span>~</span>~</span>}{\mathrm{<span><span>e</span>e</span>}}}_{\mathrm{<span><span>2</span>2</span>}}<span><span>,</span>,</span>{\stackrel{<span><span>~</span>~</span>}{\mathrm{<span><span>e</span>e</span>}}}_{\mathrm{<span><span>2</span>2</span>}}<span><span>)</span>)</span><span><span>,</span>,</span><span><span>(</span>(</span>{\stackrel{<span><span>~</span>~</span>}{\mathrm{<span><span>e</span>e</span>}}}_{\mathrm{<span><span>3</span>3</span>}}<span><span>,</span>,</span>{\stackrel{<span><span>~</span>~</span>}{\mathrm{<span><span>e</span>e</span>}}}_{\mathrm{<span><span>3</span>3</span>}}<span><span>)</span>)</span><span><span>,</span>,</span><span><span>(</span>(</span>{\stackrel{<span><span>~</span>~</span>}{\mathrm{<span><span>e</span>e</span>}}}_{\mathrm{<span><span>4</span>4</span>}}<span><span>,</span>,</span>{\stackrel{<span><span>~</span>~</span>}{\mathrm{<span><span>e</span>e</span>}}}_{\mathrm{<span><span>4</span>4</span>}}<span><span>)</span>)</span><span><span>,</span>,</span><span><span>(</span>(</span>{\stackrel{<span><span>~</span>~</span>}{\mathrm{<span><span>e</span>e</span>}}}_{\mathrm{<span><span>1</span>1</span>}}<span><span>,</span>,</span>{\stackrel{<span><span>~</span>~</span>}{\mathrm{<span><span>e</span>e</span>}}}_{\mathrm{<span><span>2</span>2</span>}}<span><span>)</span>)</span><span><span>,</span>,</span><span><span>(</span>(</span>{\stackrel{<span><span>~</span>~</span>}{\mathrm{<span><span>e</span>e</span>}}}_{\mathrm{<span><span>2</span>2</span>}}{<span><span>,</span>,</span>\stackrel{<span><span>~</span>~</span>}{\mathrm{<span><span>e</span>e</span>}}}_{\mathrm{<span><span>3</span>3</span>}}<span><span>)</span>)</span><span><span>,</span>,</span><span><span>(</span>(</span>{\stackrel{<span><span>~</span>~</span>}{\mathrm{<span><span>e</span>e</span>}}}_{\mathrm{<span><span>1</span>1</span>}}<span><span>,</span>,</span>{\stackrel{<span><span>~</span>~</span>}{\mathrm{<span><span>e</span>e</span>}}}_{\mathrm{<span><span>4</span>4</span>}}<span><span>)</span>)</span><span><span>,</span>,</span><span><span>(</span>(</span>{\stackrel{<span><span>~</span>~</span>}{\mathrm{<span><span>e</span>e</span>}}}_{\mathrm{<span><span>2</span>2</span>}}<span><span>,</span>,</span>{\stackrel{<span><span>~</span>~</span>}{\mathrm{<span><span>e</span>e</span>}}}_{\mathrm{<span><span>4</span>4</span>}}<span><span>)</span>)</span><span><span>\}</span>\}</span>$

其中，为的矢量，第i个元素为1其它元素为0，实际为一个列选择的矢量，当W₁^(k)与中码字相乘时，可以理解为选取X^(k)中的列来构造W对应的码本中的码字。in, for The vector, the i-th element is 1 and the other elements are 0, which is actually a column selection vector, when W₁^(k) and When the middle codeword is multiplied, it can be understood as selecting a column in X^(k) to construct a codeword in the codebook corresponding to W.

W对应的码本包含中任一码字左乘中任一码字得到的码字，即有m₁×m₂个码字。即实施例1中的双码本等价的单码本。The codebook corresponding to W contains Left multiplication of any code word The codewords obtained by any one of the codewords have m₁ ×m₂ codewords. That is, the double codebook in Embodiment 1 is equivalent to the single codebook.

对于这种与实施例1等价的码本，终端在物理上行共享信道上反馈RI信息r，第一PMI索引信息i₁，第二PMI索引信息i₂及CQI信息。第二PMI索引指示第二码本中RI＝r的时码本中的一个码字，所述为LTE-A中定义的总码本C中RI＝r对应的码本C²(r)中部分码字构成的。For the codebook equivalent to Embodiment 1, the terminal feeds back RI information r, first PMI index information i₁ , second PMI index information i₂ and CQI information on the physical uplink shared channel. The second PMI index indicates the time codebook of RI=r in the second codebook A code word in the It is composed of some codewords in the codebook C² (r) corresponding to RI=r in the total codebook C defined in LTE-A.

由于码本等价，可以根据实施例1中描述的构造C_PUSCH(r)的方法来构造对于其它秩的情况，也可以使用相同的方法。Since the codebooks are equivalent, it can be constructed according to the method of constructing C_PUSCH (r) described in Embodiment 1 For the case of other ranks, the same method can also be used.

需要说明的是，尽管以上的实施例均以在物理上行共享信道上反馈为例进行说明，但是，该方法同样适用于在物理上行控制信道上反馈，子码本可以采用以上实施例中的方式构成，在此不再赘述。It should be noted that although the above embodiments are all described by taking feedback on the physical uplink shared channel as an example, this method is also applicable to feedback on the physical uplink control channel, and the subcodebook can adopt the method in the above embodiments composition and will not be repeated here.

图2是根据本发明实施例的一种终端的结构框图，如图2所示，该终端包括：反馈模块22，用于在物理上行共享信道或物理上行控制信道上反馈信道状态信息，其中，所述信道状态信息包括：RI、第一码本索引PMI1、第二码本索引PMI2和CQI，该PMI2用于指示对应于该RI的压缩后的码本中的一个码字。FIG. 2 is a structural block diagram of a terminal according to an embodiment of the present invention. As shown in FIG. 2 , the terminal includes: a feedback module 22, configured to feed back channel state information on a physical uplink shared channel or a physical uplink control channel, wherein, The channel state information includes: RI, a first codebook index PMI1, a second codebook index PMI2 and CQI, where the PMI2 is used to indicate a codeword in the compressed codebook corresponding to the RI.

其中，在总码本为双码本等效的单码本形式的情况下，PMI2用于指示码本C_PUSCH(r)中的一个码字，码本C_PUSCH(r)由总码本的对应于该RI的码本C(r)中，与该PMI1对应的一组码字集合中的部分码字所构成。Among them, in the case that the total codebook is a double codebook equivalent single codebook form, PMI2 is used to indicate a codeword in the codebook C_PUSCH (r), and the codebook C_PUSCH (r) is composed of the total codebook In the codebook C(r) corresponding to the RI, part of the codewords in a set of codewords corresponding to the PMI1 are formed.

其中，在总码本为双码本形式的情况下，该PMI2用于指示码本中的一个码字，其中，码本由总码本的对应于该RI的第二码本C²(r)中的部分码字所构成。Among them, when the total codebook is in the form of a double codebook, the PMI2 is used to indicate the codebook A codeword in , where the codebook It is composed of partial codewords in the second codebook C² (r) corresponding to the RI of the total codebook.

该实施例还提供了一种反馈信道信息的方法，包括：终端在物理上行共享信道或物理上行控制信道上反馈信道状态信息，其中，该信道状态信息包括：RI、第一码本索引PMI1、第二码本索引PMI2和CQI，该PMI2所指示的最小粒度不同于该CQI所指示的最小粒度。This embodiment also provides a method for feeding back channel information, including: the terminal feeds back channel state information on a physical uplink shared channel or a physical uplink control channel, where the channel state information includes: RI, a first codebook index PMI1, The second codebook indexes PMI2 and CQI, the minimum granularity indicated by the PMI2 is different from the minimum granularity indicated by the CQI.

该方法中，PMI2和CQI无需保持相同的反馈粒度，反馈更加灵活，这样，也就无需针对每个子带都反馈PMI2和CQI，从而减小了反馈的开销。In this method, the PMI2 and CQI do not need to maintain the same feedback granularity, and the feedback is more flexible. In this way, there is no need to feed back the PMI2 and CQI for each subband, thereby reducing the feedback overhead.

优选地，PMI2所指示的最小粒度是N个RB的信道信息，CQI所指示的最小粒度是M个RB的信道信息，其中，N和M为正整数且小于当前带宽下的最大RB数，N/M或M/N为大于1的整数。Preferably, the minimum granularity indicated by PMI2 is the channel information of N RBs, and the minimum granularity indicated by CQI is the channel information of M RBs, where N and M are positive integers and less than the maximum number of RBs under the current bandwidth, N /M or M/N is an integer greater than 1.

终端在物理上行共享信道或物理上行控制信道上反馈RI信息r，第一PMI索引信息i₁，若干个第二PMI索引信息i₂及若干个CQI信息，终端具体反馈的PMI2的数量和CQI的数量可以根据各自所指示的最小粒度确定。The terminal feeds back RI information r, first PMI index information i₁ , several second PMI index information i₂ and several CQI information on the physical uplink shared channel or physical uplink control channel, and the number of PMI2 and CQI information that the terminal specifically feeds back The quantity can be determined according to the smallest granularity indicated respectively.

本实施例还提供了一种终端，包括：反馈模块22，用于在物理上行共享信道或物理上行控制信道上反馈信道状态信息，其中，信道状态信息包括：RI、第一码本索引PMI1、第二码本索引PMI2和CQI，该PMI2所指示的最小粒度不同于该CQI所指示的最小粒度。This embodiment also provides a terminal, including: a feedback module 22, configured to feed back channel state information on a physical uplink shared channel or a physical uplink control channel, where the channel state information includes: RI, a first codebook index PMI1, The second codebook indexes PMI2 and CQI, the minimum granularity indicated by the PMI2 is different from the minimum granularity indicated by the CQI.

下面通过实施例6-7，描述了对CQI和PMI使用不同的反馈粒度的反馈方法的详细处理过程。The detailed processing process of the feedback method using different feedback granularities for CQI and PMI is described below through embodiments 6-7.

实施例6Example 6

图3是根据实施例6的反馈信道信息的方法的示意图，如图3所示，PMI2是针对每个Subband都进行反馈的，而CQI是针对2个Subband反馈的，相对于每个子带都反馈一个PMI和CQI，这样可以节约开销。在CQI变化不大的场景下，性能不会引起明显下降。Figure 3 is a schematic diagram of a method for feeding back channel information according to Embodiment 6. As shown in Figure 3, PMI2 is fed back for each Subband, and CQI is fed back for 2 Subbands, and is fed back for each subband A PMI and CQI, which can save overhead. In the scenario where the CQI changes little, the performance will not cause obvious degradation.

实施例7Example 7

图4是根据实施例7的反馈信道信息的方法的示意图，如图4所示，CQI是针对每个Subband都进行反馈的，而PMI2是针对2个Subband反馈的，相对于每个子带都反馈一个PMI和CQI，这样可以节约开销。在PMI变化不大的场景下，性能不会引起明显下降。Figure 4 is a schematic diagram of a method for feeding back channel information according to Embodiment 7. As shown in Figure 4, CQI is fed back for each Subband, and PMI2 is fed back for 2 Subbands, and is fed back for each subband A PMI and CQI, which can save overhead. In the scenario where the PMI does not change much, the performance will not be significantly degraded.

综上所述，本发明实施例提供的方案能够保障PUSCH或PUCCH上用合理的开销很好的支持MU-MIMO性能。To sum up, the solution provided by the embodiment of the present invention can ensure that the PUSCH or PUCCH supports MU-MIMO performance with reasonable overhead.

需要说明的是，在附图的流程图示出的步骤可以在诸如一组计算机可执行指令的计算机系统中执行，并且，虽然在流程图中示出了逻辑顺序，但是在某些情况下，可以以不同于此处的顺序执行所示出或描述的步骤。It should be noted that the steps shown in the flowcharts of the accompanying drawings may be implemented in a computer system, such as a set of computer-executable instructions, and that although a logical order is shown in the flowcharts, in some cases, The steps shown or described may be performed in an order different than here.

显然，本领域的技术人员应该明白，上述的本发明的各模块或各步骤可以用通用的计算装置来实现，它们可以集中在单个的计算装置上，或者分布在多个计算装置所组成的网络上，可选地，它们可以用计算装置可执行的程序代码来实现，从而，可以将它们存储在存储装置中由计算装置来执行，或者将它们分别制作成各个集成电路模块，或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。这样，本发明不限制于任何特定的硬件和软件结合。Obviously, those skilled in the art should understand that each module or each step of the above-mentioned present invention can be realized by a general-purpose computing device, and they can be concentrated on a single computing device, or distributed in a network formed by multiple computing devices Optionally, they can be implemented with program codes executable by a computing device, so that they can be stored in a storage device and executed by a computing device, or they can be made into individual integrated circuit modules, or they can be integrated into Multiple modules or steps are fabricated into a single integrated circuit module to realize. As such, the present invention is not limited to any specific combination of hardware and software.

以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (13)

Translated fromChinese

1.一种反馈信道信息的方法，其特征在于，包括：1. A method for feeding back channel information, comprising:终端在物理上行共享信道或物理上行控制信道上反馈信道状态信息，其中，所述信道状态信息包括：秩指示信息RI、第一码本索引PMI1、第二码本索引PMI2和信道质量指示CQI，在总码本为双码本等效的单码本形式的情况下，所述PMI2用于指示码本C_PUSCH(r)中的一个码字，码本C_PUSCH(r)由所述总码本的对应于所述RI的码本C(r)中，与所述PMI1对应的一组码字集合中的部分码字所构成，所述PMI2所指示的最小粒度不同于所述CQI所指示的最小粒度。The terminal feeds back channel state information on the physical uplink shared channel or the physical uplink control channel, wherein the channel state information includes: rank indication information RI, first codebook index PMI1, second codebook index PMI2, and channel quality indicator CQI, In the case where the total codebook is in the form of a single codebook equivalent to a double codebook, the PMI2 is used to indicate a codeword in the codebook C_PUSCH (r), and the codebook C_PUSCH (r) is composed of the total codebook In the codebook C(r) corresponding to the RI, it is composed of some codewords in a set of codewords corresponding to the PMI1, and the minimum granularity indicated by the PMI2 is different from that indicated by the CQI the smallest granularity.2.根据权利要求1所述的方法，其特征在于，所述码本C_PUSCH(r)中包含的码字数量为所述码本C(r)中包含的码字数量的1/2或1/4。2. The method according to claim 1, wherein the number of codewords included in the codebook C_PUSCH (r) is 1/2 or 1/2 of the number of codewords included in the codebook C (r) 1/4.3.根据权利要求1所述的方法，其特征在于，在所述RI为2的情况下，所述部分码字通过以下方式之一确定：3. The method according to claim 1, wherein, when the RI is 2, the partial codeword is determined by one of the following methods:从码字集合中选择4个码字，从码字集合中选择4个码字；from the set of codewords Select 4 codewords from the codeword set Select 4 codewords;从码字集合中选择4个码字，从码字集合中选择4个码字；from the set of codewords Select 4 codewords from the codeword set Select 4 codewords;从码字集合中选择4个码字，从码字集合中选择4个码字；from the set of codewords Select 4 codewords from the codeword set Select 4 codewords;选择码字集合中的全部码字；Select codeword set All codewords in选择码字集合中的全部码字；Select codeword set All codewords in选择码字集合中的全部码字；Select codeword set All codewords in选择码字集合中的全部码字；Select codeword set All codewords in选择码字集合中的全部码字；Select codeword set All codewords in选择码字集合中的全部码字；Select codeword set All codewords in从码字集合中选择2个码字，从码字集合中选择2个码字；from the set of codewords Select 2 codewords from the codeword set Choose 2 codewords;从码字集合中选择2个码字，从码字集合中选择2个码字；from the set of codewords Select 2 codewords from the codeword set Choose 2 codewords;其中，i₁为所述PMI1的值，φ_n＝e^jπn/2,v_m＝[1 e^j2πm/32 e^j4πm/32e^j6πm/32]^T。Wherein, i₁ is the value of the PMI1, φ_n =e^jπn/2 , v_m =[1 e^j2πm/32 e^j4πm/32 e^j6πm/32 ]^T .4.根据权利要求3所述的方法，其特征在于，在所述RI为2的情况下，所述部分码字为以下之一：4. The method according to claim 3, wherein, when the RI is 2, the partial codeword is one of the following:和 and和和 and and和 and和 and5.根据权利要求1所述的方法，其特征在于，在所述RI为3的情况下，所述部分码字通过以下方式之一确定：5. The method according to claim 1, wherein when the RI is 3, the partial codeword is determined by one of the following methods:从码字集合中选择2个码字，从码字集合中选择2个码字，从码字集合中选择2个码字，从码字集合中选择2个码字；from the set of codewords Select 2 codewords from the codeword set Select 2 codewords from the codeword set Select 2 codewords from the codeword set Choose 2 codewords;从码字集合中选择1个码字，从码字集合中选择1个码字，从码字集合中选择1个码字，从码字集合中选择1个码字；from the set of codewords Select a codeword from the codeword set Select a codeword from the codeword set Select a codeword from the codeword set Select 1 code word in;其中，i₁为所述PMI1的值，φ_n＝e^jπn/2,v_m＝[1 e^j2πm/32 e^j4πm/32 e^j6πm/32]^T。Wherein, i₁ is the value of the PMI1, φ_n =e^jπn/2 , v_m =[1 e^j2πm/32 e^j4πm/32 e^j6πm/32 ]^T .6.根据权利要求1所述的方法，其特征在于，在所述RI为3的情况下，所述部分码字为以下之一：6. The method according to claim 1, wherein, when the RI is 3, the partial codeword is one of the following:和 and和 and和 and和 and和 and和 and和 and和 and和 and和 and和 and和 and和 and和 and其中，i₁为所述PMI1的值，φ_n＝e^jπn/2,v_m＝[1 e^j2πm/32 e^j4πm/32 e^j6πm/32]^T。Wherein, i₁ is the value of the PMI1, φ_n =e^jπn/2 , v_m =[1 e^j2πm/32 e^j4πm/32 e^j6πm/32 ]^T .7.根据权利要求1所述的方法，其特征在于，在所述RI为4的情况下，所述部分码字为以下之一：7. The method according to claim 1, wherein, when the RI is 4, the partial codeword is one of the following:和 and和 and和 and和 and和 and和 and其中，i₁为所述PMI1的值，φ_n＝e^jπn/2,v_m＝[1 e^j2πm/32 e^j4πm/32 e^j6πm/32]^T。Wherein, i₁ is the value of the PMI1, φ_n =e^jπn/2 , v_m =[1 e^j2πm/32 e^j4πm/32 e^j6πm/32 ]^T .8.根据权利要求1所述的方法，其特征在于，在所述RI为1的情况下，所述部分码字通过以下方式之一确定：8. The method according to claim 1, wherein, when the RI is 1, the partial codeword is determined by one of the following methods:从码字集合中选择4个码字，从码字集合中选择4个码字；from the set of codewords Select 4 codewords from the codeword set Select 4 codewords;从码字集合中选择2个码字，从码字集合中选择2个码字，从码字集合中选择2个码字，从码字集合中选择2个码字；from the set of codewords Select 2 codewords from the codeword set Select 2 codewords from the codeword set Select 2 codewords from the codeword set Choose 2 codewords;从码字集合中选择4个码字，从码字集合中选择4个码字；from the set of codewords Select 4 codewords from the codeword set Select 4 codewords;从码字集合中选择2个码字，从码字集合中选择2个码字，从码字集合中选择2个码字，从码字集合中选择2个码字；from the set of codewords Select 2 codewords from the codeword set Select 2 codewords from the codeword set Select 2 codewords from the codeword set Choose 2 codewords;其中，i₁为所述PMI1的值，φ_n＝e^jπn/2,v_m＝[1 e^j2πm/32 e^j4πm/32 e^j6πm/32]^T。Wherein, i₁ is the value of the PMI1, φ_n =e^jπn/2 , v_m =[1 e^j2πm/32 e^j4πm/32 e^j6πm/32 ]^T .9.根据权利要求8所述的方法，其特征在于，在所述RI为1的情况下，所述部分码字为以下之一：9. The method according to claim 8, wherein, when the RI is 1, the partial codeword is one of the following:和 and和 and10.一种反馈信道信息的方法，其特征在于，包括：10. A method for feeding back channel information, comprising:终端在物理上行共享信道或物理上行控制信道上反馈信道状态信息，其中，所述信道状态信息包括：RI、第一码本索引PMI1、第二码本索引PMI2和CQI，在总码本为双码本形式的情况下，所述PMI2用于指示码本中的一个码字，其中，码本由所述总码本的对应于所述RI的第二码本C²(r)中的部分码字所构成，所述PMI2所指示的最小粒度不同于所述CQI所指示的最小粒度。The terminal feeds back channel state information on the physical uplink shared channel or the physical uplink control channel, wherein the channel state information includes: RI, the first codebook index PMI1, the second codebook index PMI2 and CQI, and the total codebook is double In the case of codebook form, the PMI2 is used to indicate the codebook A codeword in , where the codebook Consisting of partial codewords in the second codebook C² (r) corresponding to the RI of the overall codebook, the minimum granularity indicated by the PMI2 is different from the minimum granularity indicated by the CQI.11.根据权利要求10所述的方法，其特征在于，所述码本中包含的码字数量为所述第二码本C²(r)中包含的码字数量的1/2或1/4。11. The method according to claim 10, wherein the codebook The number of codewords included in is 1/2 or 1/4 of the number of codewords included in the second codebook C² (r).12.一种终端，其特征在于，包括：12. A terminal, characterized in that, comprising:反馈模块，用于在物理上行共享信道或物理上行控制信道上反馈信道状态信息，其中，所述信道状态信息包括：RI、第一码本索引PMI1、第二码本索引PMI2和CQI，在总码本为双码本等效的单码本形式的情况下，所述PMI2用于指示码本C_PUSCH(r)中的一个码字，码本C_PUSCH(r)由所述总码本的对应于所述RI的码本C(r)中，与所述PMI1对应的一组码字集合中的部分码字所构成，所述PMI2所指示的最小粒度不同于所述CQI所指示的最小粒度。A feedback module, configured to feed back channel state information on a physical uplink shared channel or a physical uplink control channel, wherein the channel state information includes: RI, a first codebook index PMI1, a second codebook index PMI2, and a CQI, in the overall When the codebook is in the form of a single codebook equivalent to a double codebook, the PMI2 is used to indicate a codeword in the codebook C_PUSCH (r), and the codebook C_PUSCH (r) is composed of the total codebook In the codebook C(r) corresponding to the RI, it is composed of some codewords in a set of codewords corresponding to the PMI1, and the minimum granularity indicated by the PMI2 is different from the minimum granularity indicated by the CQI. granularity.13.一种终端，其特征在于，包括：13. A terminal, characterized in that, comprising:反馈模块，用于在物理上行共享信道或物理上行控制信道上反馈信道状态信息，其中，所述信道状态信息包括：RI、第一码本索引PMI1、第二码本索引PMI2和CQI，在总码本为双码本形式的情况下，所述PMI2用于指示码本中的一个码字，其中，码本由所述总码本的对应于所述RI的第二码本C²(r)中的部分码字所构成，所述PMI2所指示的最小粒度不同于所述CQI所指示的最小粒度。A feedback module, configured to feed back channel state information on a physical uplink shared channel or a physical uplink control channel, wherein the channel state information includes: RI, a first codebook index PMI1, a second codebook index PMI2, and a CQI, in the overall When the codebook is in the form of a dual codebook, the PMI2 is used to indicate the codebook A codeword in , where the codebook Consisting of partial codewords in the second codebook C² (r) corresponding to the RI of the overall codebook, the minimum granularity indicated by the PMI2 is different from the minimum granularity indicated by the CQI.