CN101917260B - Feedback method and device of channel state information - Google Patents

Abstract

The invention discloses a channel state information feedback method and device, which support multiple carrier components and/or multiple PMI feedbacks. The method includes: the user equipment (UE) feeds back rank indicator (RI) information, and broadband channel information and/or channel information of each carrier component to the base station; wherein, the RI information, broadband channel information, and carrier component channel information are respectively carried in Different report types (Report Type). Compared with the prior art, the technical solution of the present invention solves the problem in the related art that multiple carrier components and/or multiple PMI feedbacks cannot be supported.

Description

Feedback method and device for channel state information

technical field

The present invention relates to the communication field, in particular to a feedback method and device for channel state information.

Background technique

In a wireless communication system, the sending end and the receiving end use multiple antennas in a spatial multiplexing manner to obtain a higher rate. One of the techniques for enhancing spatial multiplexing is that the receiving end feeds back channel information (also called channel state information) to the sending end, and the sending end uses the transmit precoding technology according to the obtained channel information to improve transmission performance.

In the 3GPP long-term evolution (Long Term Evolution, referred to as LTE) plan, the feedback of channel information mainly uses a relatively simple single codebook feedback method, and the multi-input multi-output (Multi-input Multi-output, referred to as MIMO) The performance of the transmit precoding technique depends on the accuracy of the codebook feedback therein.

The basic principle of the channel information quantization feedback based on the codebook is briefly described below.

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 save or generate this codebook in real time (The transmitter and receiver are the same). For the channel H that needs to feed back channel state information (CSI), the receiving end starts from the codebook space according to certain criteria Choose a codeword that best matches the actual channel H and put the codeword The sequence number i (codeword sequence number) of is fed back to the transmitter. Here, the codeword sequence number is called a precoding matrix indicator (Precoding Matrix Indicator, PMI for short) in the codebook. The transmitter finds the corresponding precoding code word according to the sequence number i In order to obtain the corresponding channel information, Represents the feature vector information of the channel.

In general codebook space 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. Therefore, the codebook space It can be divided into multiple sub-codebooks according to different Ranks, as shown in Table 1.

Table 1

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. Among them, a vector can also be regarded as a matrix with a dimension of 1.

In the LTE standard, the minimum feedback unit of channel information is a subband (Subband), a subband is composed of several resource blocks (Resource Block, RB for short), and each RB is composed of multiple resource elements (Resource Element, short for RB). is composed of RE); RE is the smallest unit of time-frequency resources in LTE. When the UE feeds back the channel information, the corresponding object may be a subband, or multiple subbands (Multi-Subband), and wideband (Wideband).

There are many feedback modes in the LTE system, and there are different feedback modes in different transmission modes. During spatial multiplexing, there are three main types of feedback content for uplink channel information:

PMI information, characterizing feature vector information, recommended to the base station for downlink precoding technology;

Rank indicator (Rank Indicator, referred to as RI), which represents the rank of the channel, and is recommended to the base station as the number of layers supported by the downlink. Among them, the maximum support for LTE is RI=4;

Channel Quality Indicator (CQI for short), characterizes the quality information of the channel, and uses the recommended modulation and coding method to represent the channel quality. The higher the modulation and coding method, the better the performance, and supports 16 options; as shown in the table 2 shows:

Table 2

Among them, the feedback of channel information is divided into the following two types:

Periodic feedback, which is mainly carried on the uplink control channel (PUCCH);

The aperiodic feedback is the feedback carried on the uplink shared channel (PUSCH).

Periodic feedback on PUCCH will be described below.

In the LTE system, there are four feedback types (Type) for channel information feedback on PUCCH:

Type 1, feedback the CQI of the subband selected by the UE;

Type 2, feedback broadband CQI and PMI information;

Type 3, feedback RI information;

Type 4, only feedback wideband CQI.

Fig. 1 is a schematic diagram of feedback forms corresponding to two feedback modes of an LTE system according to the related art.

Among them, the report (Report) type 3 RI information is encoded independently, for example, 2 bits (bit) are used for 4 transmit antennas to indicate the situation where RI is 1, 2, 3, and 4 in total.

Report type 2 contains 4-bit PMI information, indicating a certain codeword in the LTE codebook, and also contains CQI information. When RI=1, it is 1 CQI, and when RI>1, it is 2 CQIs. When 1 CQI is used, it is 4 bits. When 2 CQIs are fed back, the second CQI uses differential technology, based on the difference of the first CQI, which is 3 bits. The maximum is 11 bits, which is also the maximum supportable overhead of the CSI information when fed back on the PUCCH.

The definition of 3bit differential CQI is shown in Table 3:

table 3

Spatial difference CQI value Offset 0 0 1 1 2 2 3 ≥3 4 ≤-4 5 -3 6 -2 7 -1

Report type 1 contains subband CQI information and subband location information, indicating the channel quality and location of the subband. When RI=1, each sub-band contains a 4-bit CQI information and L bit current sub-band position information, that is, 4+L bits; when RI>1, each sub-band contains a 4-bit CQI information and L bit current sub-band In addition to the position information of the belt, it also includes a 3-bit differential CQI information, which has a total of 7+L bits. Although L is related to the size of the bandwidth, the total load of subband CQI and subband position information will not exceed the maximum 11-bit overhead that can be supported on the PUCCH.

The Long Term Evolution Advanced (LTE-A for short) system supports a larger system bandwidth (up to 100MHz) and is backward compatible with existing LTE standards. In order to improve the coverage and throughput of the cell edge, LTE-A supports a maximum of 8 antennas in the downlink and RI=8 on the basis of the existing LTE system, and proposes some feedback enhancement technologies during feedback, mainly By enhancing the feedback accuracy of the codebook, this technology can improve the spectrum utilization rate of the evolved International Mobile Telecommunications-Advance (IMT-Advance) system and alleviate the shortage of spectrum resources.

The technology in the LTE-A system will be described below.

1) The precoding/feedback structure of a subband consists of two matrices.

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. The codebook can vary at different times and on different subbands.

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) 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.

It can be seen from the above that in the LTE-A system, a structure based on a dual codebook is proposed for channel information feedback, which will be described below.

For a subband or multiple joint subbands that need to feed back channel information, the UE feeds back at least two PMI information to the terminal, namely PMI1 and PMI2, where PMI1 corresponds to the codeword W1 in a codebook C1, and PMI2 corresponds to another code Codeword W2 in this 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 obtains the channel information according to the agreed function rule F(W1, W2) .

Therefore, in the LTE-A system, in the transmission mode supporting single user terminal (SU)/multi-user terminal (MU), among the broadband/multi-subband channel information that needs to be fed back, the channel information that needs to be transmitted includes RI, PMI1 and PMI2 and CQI.

Since the number of channel state information feedbacks on the PUCCH is limited, only a single PMI feedback can be supported (the situation without PMI feedback is not considered here, such as modes 1-0 and 2-0), so for the enhanced code This situation needs to address how to support the feedback of the two PMIs.

In the LTE system, the maximum bandwidth it can support is 20MHz, while in the LTE-A system, by aggregating multiple carriers that are backward compatible with LTE, a maximum bandwidth of 100MHz can be obtained, thus meeting greater bandwidth requirements , while maintaining backward compatibility with the LTE system. Specifically, in the LTE-A system, when the UE's receiving capability exceeds the 20MHz bandwidth, it can receive multiple carrier component information; and for an R8 terminal UE that can only reach 20MHz, it can only receive one of the carrier component information .

According to different scenarios, carrier aggregation can be divided into: in-band continuous carrier aggregation, in-band non-continuous carrier aggregation, and out-of-band non-continuous carrier aggregation.

Since the carrier aggregation technology includes multiple carrier components, new requirements are put forward for feeding back channel state information.

Contents of the invention

The technical problem to be solved by the present invention is to provide a channel state information feedback method and device that supports multiple carrier components and/or multiple PMI feedbacks.

In order to solve the above technical problems, the present invention firstly provides a feedback method of channel state information, including:

The user equipment (UE) feeds back rank indicator (RI) information, wideband channel information and/or component channel information of each carrier to the base station;

Among them, the RI information, wideband channel information, and carrier component channel information are respectively carried in different report types (Report Type).

Preferably, the content in the broadband channel information and/or the channel information of each carrier component is determined by the report type according to the RI information at the previous moment.

Preferably,

For a single codebook feedback structure:

The wideband channel information includes wideband CQI information and wideband PMI information; the carrier component channel information includes CQI information and PMI information on each carrier component;

For the dual codebook feedback structure, and when the UE feeds back RI information, wideband channel information and channel information of each carrier component to the base station:

The wideband channel information includes wideband CQI information and PMI1 information in the dual codebook; the carrier component channel information includes CQI information on each carrier component and PMI2 information in the dual codebook;

For the dual codebook feedback structure, and when the UE feeds back RI information and broadband channel information or component channel information of each carrier to the base station:

The wideband channel information includes wideband CQI information and PMI information in a dual codebook; the carrier component channel information includes CQI information on each carrier component and PMI information in a dual codebook.

Preferably,

For a single codebook feedback structure, when the RI at the previous moment is 1:

The report type carrying the wideband channel information includes wideband CQI information and wideband PMI information;

The report type carrying the channel information of the carrier component includes CQI information on the current component carrier and PMI information on the current component carrier;

For a single codebook feedback structure, when the RI at the previous moment is greater than 1:

The report type carrying the wideband channel information includes wideband CQI information for the first codeword stream, wideband differential CQI for the second codeword stream based on the wideband CQI information of the first codeword stream information, and broadband PMI information;

The report type carrying the carrier component channel information includes the carrier component CQI information for the first codeword stream on the current carrier component, and the carrier component information for the second codeword stream based on the first codeword stream The differential carrier component CQI information of the CQI information, and the PMI information on the current carrier component.

Preferably, for a single codebook feedback structure, the wideband PMI information and the PMI information of each carrier component are selected based on the same codebook.

Preferably,

For the dual codebook feedback structure, when the RI at the previous moment is 1:

The report type carrying the wideband channel information includes wideband CQI information and PMI1 information in the dual codebook; the report type carrying the carrier component channel information includes CQI information on the current carrier component and PMI2 information in the dual codebook ;

Alternatively, the report type carrying the broadband channel information includes wideband CQI information and PMI information in the dual codebook; the report type carrying the carrier component channel information includes CQI information on the current carrier component and the PMI information in the dual codebook. PMI information;

For the dual codebook feedback structure, when the RI at the previous moment is greater than 1:

The report type carrying the wideband channel information includes wideband CQI information for the first codeword stream, wideband differential CQI for the second codeword stream based on the wideband CQI information of the first codeword stream information, and PMI1 information in the dual codebook; the report type carrying the carrier component channel information includes the carrier component CQI information for the first codeword stream on the current carrier component, and the carrier component CQI information for the second codeword stream The differential carrier component CQI information based on the carrier component CQI information of the first codeword stream, and the PMI2 information in the dual codebook;

Alternatively, the report type carrying the wideband channel information includes wideband CQI information for the first codeword stream, and wideband CQI information for the second codeword stream based on the wideband CQI information for the first codeword stream. Differential CQI information, and PMI information in the dual codebook; the report type carrying the carrier component channel information includes the carrier component CQI information for the first codeword stream on the current carrier component, and the carrier component CQI information for the second codeword stream The differential carrier component CQI information of the word stream based on the carrier component CQI information of the first codeword stream, and the PMI information in the dual codebook.

Preferably, for the dual-codebook feedback structure, the PMI1 information in the dual-codebook is selected based on the codebook C1 in the dual-codebook, and the PMI2 information in the dual-codebook is based on the code in the dual-codebook This C2 is selected.

Preferably, for the dual codebook feedback structure,

The PMI information in the dual codebook is formed according to the PMI1 information in the dual codebook and/or the PMI2 information in the dual codebook;

Or, the PMI information in the dual codebook indicates the precoding matrix index of the sample combined codebook;

Wherein, the sampling combined codebook is a codebook generated according to codebook C1 and/or codebook C2 in the dual codebook.

Preferably,

When the RI is 1, the p-bit PMI information in the dual codebook is composed of p1-bit PMI1 information and p2-bit PMI2 information, where p1+p2=p;

When RI is greater than 1, the PMI information of q bits in the dual codebook is composed of PMI1 information of q1 bits and PMI2 information of q2 bits, where q1+q2=q;

Wherein, the p1, p2, q1 and q2 are all integers greater than or equal to 0.

Preferably,

When the RI is 1 and p1 is 0, what the UE feeds back is the RI information report, wideband CQI information and PMI2 information in the dual codebook;

When the RI is 1 and p2 is 0, the information fed back by the UE is RI information report, wideband CQI information and PMI1 in the dual codebook;

When the RI is greater than 1 and q1 is 0, what the UE feeds back is RI information report, wideband CQI information, differential wideband CQI and PMI2 information in the dual codebook;

When the RI is greater than 1 and q2 is 0, the information fed back by the UE is RI information report, wideband CQI information, differential wideband CQI information and PMI1 in the dual codebook.

Preferably,

When the sampling combined codebook is codebook C1 in the dual codebook, the PMI information in the dual codebook is PMI1 information in the dual codebook;

When the combined sampling codebook is codebook C2 in the dual codebook, the PMI information in the dual codebook is PMI2 information in the dual codebook.

In order to solve the above technical problems, the present invention also provides a channel state information feedback device, including a setting module and a feedback module, wherein:

The setting module is configured to set an indicator (PMI) carrying a precoding matrix in broadband channel information and/or carrier component channel information;

The feedback module is configured to feed back rank indicator (RI) information, and the broadband channel information and/or each carrier component channel information to the base station;

Wherein, the RI information, broadband channel information and carrier component channel information are respectively carried in three different report types.

Preferably, the wideband channel information and/or the content in the channel information of each carrier component is determined by the report type according to the RI information at the previous moment.

Compared with the prior art, the technical solution of the present invention proposes a method and device for feeding back channel state information, which solves the problem in the related art that it cannot support multiple carrier components and/or multiple PMI feedbacks, and then can realize multiple The feedback of multiple carrier components and/or multiple PMIs meets the feedback requirements of multiple carrier components during carrier aggregation and multiple PMIs in the dual codebook structure, and adapts to the development direction of the LTE-A system.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, and are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the attached picture:

FIG. 1 is a schematic diagram of feedback forms corresponding to two feedback modes in an existing LTE system;

FIG. 2(a) and FIG. 2(b) are schematic diagrams of a channel state information feedback method according to Embodiment 1 of the present invention;

FIG. 3(a), FIG. 3(b) and FIG. 3(c) are schematic diagrams of a channel state information feedback method according to Embodiment 2 of the present invention;

FIG. 4 is a schematic diagram of a channel state information feedback method according to Embodiment 3 of the present invention;

FIG. 5 is a schematic diagram of a channel state information feedback method according to Embodiment 4 of the present invention;

Fig. 6 is a schematic structural diagram of an apparatus for feeding back channel state information according to Embodiment 5 of the present invention.

Detailed ways

The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so as to fully understand and implement the process of how to apply technical means to solve technical problems and achieve technical effects in the present invention.

First of all, if there is no conflict, the embodiment of the present invention and the combination of various features in the embodiment are within the protection scope of the present invention. In addition, the steps shown in the flow diagrams of the figures may be performed in a computer system, such as a set of computer-executable instructions, and, although a logical order is shown in the flow diagrams, in some cases, the sequence may be different. The steps shown or described are performed in the order herein.

Embodiment 1. A feedback method for channel state information

The channel state information feedback method provided in this embodiment is applied to a transmission mode supporting carrier aggregation in an Advanced Long Term Evolution LTE-A system, and supports a dual codebook channel state information feedback method.

The method mainly includes the following steps:

The user equipment (UE) feeds back rank indicator (RI) information, wideband channel information and/or component channel information of each carrier to the base station;

Among them, RI information, wideband channel information, and carrier component channel information are respectively carried in three different report types (Report Type).

The report type carrying broadband channel information and the report type carrying carrier component channel information in this embodiment will be described in detail below with reference to FIG. 2(a) and FIG. 2(b).

The content carried in the broadband channel information and/or the channel information of each carrier component is determined by the Report Type according to the RI information at the previous moment.

When RI=1 at the previous moment,

Report types that carry wideband channel information include the following information:

Broadband Channel Quality Indicator (CQI) information and PMI1 information in the dual codebook;

Report types that carry carrier component channel information include the following information:

CQI information on the current carrier component and PMI2 information in the dual codebook.

When the RI at the previous moment is greater than 1,

Report types that carry wideband channel information include the following information:

wideband channel quality indicator (CQI) information for the first codeword stream, differential channel quality indicator (CQI) information for the second codeword stream based on the wideband CQI information for the first codeword stream, and PMI1 information in the dual codebook;

Report types that carry carrier component channel information include the following information:

The carrier component channel quality indicator (CQI) information for the first codeword stream on the current carrier component, the differential carrier component channel for the second codeword stream based on the CQI information of the first codeword stream carrier component Quality indicator (CQI) information, and PMI2 information in the dual codebook.

Wherein, the PMI1 information is selected based on the codebook C1, and the PMI2 information of each carrier component is selected based on the codebook C2.

It can be seen from the above that the PMI information in the dual codebook is carried in the broadband channel information and the carrier component channel information.

The feedback channel state information report can be fed back according to the format described in Figure 2(a), including: RI information report, wideband channel information report including wideband CQI information (WB-CQI) and PMI1 information, and N carrier component channel information ;

Wherein, N is the number of carrier components;

Wherein, the i-th carrier component channel information includes CQI information (CCi-CQI) on the i-th carrier component and PMI2 (CCi-PMI2) information on the i-th carrier component; the value of i is from 1 to N. Among them, the WB-CQI in the figure may include the CQI information of the first codeword stream, or the CQI information of the first codeword stream and the differential CQI information of the second codeword stream; CCi-CQI may include the first The CQI information of the codeword stream, or the CQI information of the first codeword stream and the differential CQI information of the second codeword stream.

Specifically, when RI is 1, the feedback contents are: RI information report, wideband CQI information, PMI1 information, CQI information on the first carrier component, PMI2 information on the first carrier component, and the second CQI information on the carrier component, PMI2 information on the second carrier component, ..., CQI information on the Nth carrier component, and PMI2 information on the Nth carrier component. When RI is greater than 1, the feedback contents are: RI information report, wideband CQI information, wideband differential CQI information, PMI1 information, CQI information on the first carrier component, differential CQI information on the first carrier component, and PMI2 information on one carrier component, CQI information on the second carrier component, differential CQI information on the second carrier component, PMI2 information on the second carrier component, ..., Nth CQI information on the carrier component, differential CQI information on the Nth carrier component, and PMI2 information on the Nth carrier component.

The channel state information report fed back can also be fed back according to the format described in Figure 2(b), including: RI information report, wideband channel information report including wideband CQI information and PMI1 information;

Wherein, the WB-CQI in the figure may include CQI information of the first codeword stream, or CQI information of the first codeword stream and differential CQI information of the second codeword stream.

Specifically, when RI is 1, the feedback contents are: RI information report, wideband CQI information and PMI1 information; when RI is greater than 1, the feedback contents are: RI information report, wideband CQI information, wideband differential CQI information as well as PMI1 information.

For the wideband channel information report, the wideband CQI information for the first codeword stream can be 4 bits, and the wideband differential CQI information for the second codeword stream based on the wideband CQI information of the first codeword stream can be is 3 bits, and the PMI1 information in the dual codebook can be 4 bits;

Or, when RI=1, the wideband CQI information used for the first codeword stream can be 4 bits, and the PMI information in the dual codebook can be 6 bits; when RI is greater than 1, it can be used for the first codeword The wideband CQI information of the stream can be 4 bits, the wideband differential CQI information based on the wideband CQI information of the first codeword stream for the second codeword stream can be 1 bit, and the PMI1 information in the dual codebook can be 6 bits bit.

For the carrier component channel information report, the carrier component CQI information used for the first codeword stream can be 4 bits, and the carrier component differential CQI information used for the second codeword stream can be 3 bits. The PMI2 information may be 4 bits.

Through this embodiment, the technical solution of the present invention can meet the limitation requirement that the maximum capacity of the uplink control channel (PUCCH) is 11 bits, and can also meet the feedback requirements for multi-carrier component channel state information in the LTE-A system, and can adapt to LTE - A dual-codebook channel state information feedback structure in the A system.

It should be noted that the technical solution of the present invention is not limited to the number of bits set above in actual application. When the technical solution of the present invention is actually applied, it is possible to exceed the maximum load that can be supported on the PUCCH, and it is necessary to expand the capacity of the PUCCH. For example, the following preferred implementation methods can be adopted:

If the number of bits of each carrier component channel information or wideband channel information is greater than the maximum load (such as 11 bits) supported by the uplink control channel (PUCCH), then reduce the differential CQI (carrier) in each carrier component channel information or wideband channel information. The number of bits of the component differential CQI or wideband differential CQI), and the reduced number of bits of the differential CQI is used to feed back PMI information. Through this preferred implementation mode, the LTE system can be better compatible.

It should be noted that, in the foregoing embodiments of the present invention, channel information of different carrier components needs to be transmitted separately in different carrier component feedback reports.

Embodiment 2. A feedback method for channel state information

The channel state information feedback method provided in this embodiment is applied to a transmission mode supporting carrier aggregation in an Advanced Long Term Evolution LTE-A system, and supports a channel state information feedback mode of a single codebook feedback structure.

The method comprises the steps of:

The user equipment (UE) feeds back rank indicator (RI) information, wideband channel information and/or component channel information of each carrier to the base station;

Among them, RI information, wideband channel information, and carrier component channel information are respectively carried in three different report types (Report Type).

The report type carrying broadband channel information and the report type carrying carrier component channel information in this embodiment will be described in detail below with reference to FIG. 3(a), FIG. 3(b) and FIG. 3(c).

The content in the report type of the broadband channel information and/or the channel information of each carrier component is determined by the ReportType according to the RI information at the previous moment.

When RI=1 at the previous moment,

Report types that carry wideband channel information include the following information:

Wideband CQI information (WB-CQI) and wideband PMI information (WB-PMI);

Report types that carry carrier component channel information include the following information:

CQI information on the current carrier component and PMI information on the current carrier component.

When the RI at the previous moment is greater than 1,

Report types that carry wideband channel information include the following information:

wideband channel quality indicator (CQI) information for the first codeword stream, differential channel quality indicator (CQI) information for the second codeword stream based on the wideband CQI information for the first codeword stream, and Broadband PMI information;

Report types that carry carrier component channel information include the following information:

The carrier component channel quality indicator (CQI) information for the first codeword stream on the current carrier component, the differential carrier component channel for the second codeword stream based on the CQI information of the first codeword stream carrier component Quality indicator (CQI) information, and PMI information on the current carrier component.

Wherein, the wideband PMI information and the PMI information of each carrier component are selected based on the same codebook.

It can be seen from the above that the PMI information in the single codebook is carried in the broadband channel information and the carrier component channel information.

In particular, the feedback channel state information report can be fed back according to the format described in FIG. 3(a), including: RI information report, wideband channel information report including wideband CQI information and wideband PMI information, and N carrier component channel information;

Wherein, N is the number of carrier components;

Wherein, the i-th carrier component channel information includes the CQI information (CCi-CQI) on the i-th carrier component and the PMI information (CCi-PMI) on the i-th carrier component; wherein, the value of i is from 1 to N.

Among them, the WB-CQI in the figure may include the CQI information of the first codeword stream, or the CQI information of the first codeword stream and the differential CQI information of the second codeword stream; CCi-CQI may include the first The CQI information of the codeword stream, or the CQI information of the first codeword stream and the differential CQI information of the second codeword stream.

Specifically, when RI is 1, the feedback contents are: RI information report, wideband CQI information, wideband PMI information, CQI information on the first carrier component, PMI information on the first carrier component, second CQI information on the first carrier component, PMI information on the second carrier component, ..., CQI information on the Nth carrier component, and PMI information on the Nth carrier component. When RI is greater than 1, the feedback contents are: RI information report, wideband CQI information, wideband differential CQI information, wideband PMI information, CQI information on the first carrier component, differential CQI information on the first carrier component, PMI information on the first carrier component, CQI information on the second carrier component, differential CQI information on the second carrier component, PMI information on the second carrier component, ..., Nth CQI information on the carrier component, differential CQI information on the Nth carrier component, and PMI information on the Nth carrier component;

The channel state information report for feedback can also be fed back according to the format described in FIG. It includes the CQI information of the first codeword stream, or the CQI information of the first codeword stream and the differential CQI information of the second codeword stream.

Specifically, when RI is 1, the feedback contents are: RI information report, wideband CQI information and wideband PMI information; when RI is greater than 1, the feedback contents are: RI information report, wideband CQI information, wideband differential CQI information and wideband PMI information.

The fed back channel state information report can also be fed back according to the format described in FIG. 3(c), including: RI information report, and N carrier component channel information report.

Wherein, N is the number of carrier components;

Wherein, the i-th carrier component channel information includes CQI information on the i-th carrier component and PMI information on the i-th carrier component; wherein, the value of i is from 1 to N.

Wherein, the CCi-CQI in the figure may include the CQI information of the first codeword stream, or the CQI information of the first codeword stream and the differential CQI information of the second codeword stream.

Specifically, when RI is 1, the feedback contents are: RI information report, CQI information on the first carrier component, PMI information on the first carrier component, CQI information on the second carrier component, PMI information on the second carrier component, ..., CQI information on the Nth carrier component, and PMI information on the Nth carrier component. When RI is greater than 1, the feedback contents are: RI information report, CQI information on the first carrier component, differential CQI information on the first carrier component, PMI information on the first carrier component, and the second CQI information on the carrier component, differential CQI information on the second carrier component, PMI information on the second carrier component, ..., CQI information on the Nth carrier component, Nth carrier component The differential CQI information on , and the PMI information on the Nth carrier component.

For the wideband channel information report, the wideband CQI information for the first codeword stream may be 4 bits, the wideband differential CQI information for the second codeword stream may be 3 bits, and the wideband PMI information may be 4 bits.

For the carrier component channel information report, the carrier component CQI information for the first codeword stream can be 4 bits, the carrier component differential CQI information for the second codeword stream can be 3 bits, and the carrier component PMI information can be is 4 bits.

Through this embodiment, the technical solution of the present invention can meet the restriction requirement that the maximum capacity of the uplink control channel (PUCCH) is 11 bits, and at the same time, it can also meet the feedback requirement for multi-carrier component channel state information in the LTE-A system.

It should be noted that the technical solution of the present invention is not limited to the number of bits set above in actual application, and may exceed the maximum load that can be supported on the PUCCH, and the PUCCH needs to be expanded. For example, the following preferred implementation methods can be adopted:

If the number of bits of each carrier component channel information or wideband channel information is greater than the maximum load (such as 11 bits) supported by the uplink control channel (PUCCH), then reduce the differential CQI (carrier) in each carrier component channel information or wideband channel information. The number of bits of the component differential CQI or wideband differential CQI), and the reduced number of bits of the differential CQI is used to feed back PMI information. Through this preferred implementation mode, the LTE system can be better compatible.

It should be noted that, in the foregoing embodiments of the present invention, channel information of different carrier components needs to be transmitted separately in different carrier component feedback reports.

Embodiment 3, a feedback method of channel state information

The channel state information feedback method provided in this embodiment is applied to a transmission mode supporting carrier aggregation in an Advanced Long Term Evolution LTE-A system, and supports a channel state information feedback mode of a dual codebook feedback structure.

The method mainly includes the following steps:

User equipment (UE) feeds back rank indicator (RI) information and wideband channel information to the base station;

Wherein, the RI information and the broadband channel information are respectively carried in two different report types (ReportType).

The report types carrying broadband channel information in this embodiment will be described in detail below with reference to FIG. 4 .

The content of the broadband channel information is determined by the Report Type based on the RI information at the previous moment.

When RI=1 at the previous moment,

Report types that carry wideband channel information include the following information:

Broadband Channel Quality Indicator (CQI) information and PMI information in the dual codebook.

When the RI at the previous moment is greater than 1,

Report types that carry wideband channel information include the following information:

wideband channel quality indicator (CQI) information for the first codeword stream, differential channel quality indicator (CQI) information for the second codeword stream based on the wideband CQI information for the first codeword stream, and PMI information in the dual codebook.

The PMI information in the dual codebook may also represent the precoding matrix index of the sampling combined codebook; the sampling combined codebook is based on the codebook C1 and/or codebook C2 in the dual codebook after sampling or other algorithms Codebook generated jointly.

When the sampling combined codebook is codebook C1, the PMI information in the double codebook is PMI1 information;

When the sample combined codebook is codebook C2, the PMI information of the dual codebook is PMI2 information.

The PMI1 information is selected based on the codebook C1, and the PMI2 information is selected based on the codebook C2.

The channel state information report fed back can be fed back according to the format described in Figure 4, including: RI information report, including wideband CQI information (WB-CQI) and PMI information in the dual codebook;

Wherein, the WB-CQI in the figure may include CQI information of the first codeword stream, or CQI information of the first codeword stream and differential CQI information of the second codeword stream.

Specifically, when RI is 1, the feedback contents are: RI information report, wideband CQI information, and PMI information in the dual codebook; when RI is greater than 1, the feedback contents are: RI information report, wideband CQI information information, wideband differential CQI information, and PMI information in the dual codebook.

The PMI information in the dual codebook may be formed according to the PMI1 information in the dual codebook and/or the PMI2 information in the dual codebook.

According to the method of this embodiment, for example, when RI is 1, the user terminal feeds back r-bit RI information, c-bit WB-CQI information, and p-bit dual codebook PMI information; The PMI information is composed of p1-bit PMI1 information and p2-bit PMI2 information, where p1+p2=p, p1 and p2 are integers greater than or equal to 0; or, the PMI information of the dual codebook can also be p-bit It is used to indicate the precoding matrix is sampling the combined codebook index value, wherein the sampled combined codebook is a codebook of 2 ^p codewords jointly generated by the dual codebooks C1 and C2.

When RI is greater than 1, the user terminal feeds back r-bit RI information, c-bit WB-CQI information, dc-bit differential wideband CQI information, and q-bit dual-codebook PMI information; wherein the dual-codebook q-bit PMI The information can be composed of q1-bit PMI1 information and q2-bit PMI2 information, where q1+q2=q, q1 and q2 are integers greater than or equal to 0; or, the PMI information of the dual codebook can also be q-bit is used to indicate the index value of the precoding matrix in the sampled combined codebook, where the sampled combined codebook is a codebook of 2 ^q codewords jointly generated by the dual codebooks C1 and C2.

When RI is 1, and the PMI information of the dual codebook is composed of p1-bit PMI1 information and p2-bit PMI2 information, and when p2 is 0, the information fed back by the UE is RI information report and wideband CQI information and PMI1 in the dual codebook; when the p1 is 0, the UE feeds back RI information report, wideband CQI information and PMI2 information in the dual codebook.

When RI is greater than 1, and the PMI information of the dual codebook is composed of q1-bit PMI1 information and q2-bit PMI2 information, and when q2 is 0, the information fed back by the UE is RI information report, wideband CQI information, differential wideband CQI information, and PMI1 in the dual codebook; when the q1 is 0, the UE feeds back the RI information report, wideband CQI information, differential wideband CQI, and PMI2 information in the dual codebook.

When RI is 1, and the PMI information of the dual codebook is q bits used to indicate that the precoding matrix is sampling the combined codebook index value, when the sampling combined codebook is the C1 codebook in the dual codebook, then The information fed back by the UE is the RI information report, wideband CQI information, and PMI1 in the dual codebook; when the combined sampling codebook is the C2 codebook in the dual codebook, the information fed back by the UE is the RI information report, wideband CQI information and PMI2 in the dual codebook.

When RI is greater than 1, and the PMI information of the dual codebook is q bits used to indicate that the precoding matrix is sampling the combined codebook index value, when the sampling combined codebook is the C1 codebook in the dual codebook, then The information fed back by the UE is RI information report, wideband CQI information, differential wideband CQI information, and PMI1 in the dual codebook; when the combined sampling codebook is the C2 codebook in the dual codebook, the information fed back by the UE is RI Information report, wideband CQI information, differential wideband CQI information and PMI2 in dual codebook.

The above r can be 3, c can be 4, dc can be 3, p can be 7, p1 can be 4, p2 can be 3, q can be 4, q1 can be 2, and q2 can be 2.

It should be noted that the technical solution of the present invention is not limited to the number of bits set above in actual application; it should be noted that the technical solution of the present invention is not limited to the number of bits set above in actual application.

Through this embodiment, the technical solution of the present invention can meet the limitation requirement that the maximum capacity of the uplink control channel (PUCCH) is the maximum bit amount, and can also meet the feedback requirements for multi-channel state information in the LTE-A system, and can adapt to the LTE-A system. Dual codebook channel state information feedback structure in system A. It should be noted that, when the technical solution of the present invention is actually applied, it may exceed the maximum load that can be supported on the PUCCH, and it is necessary to expand the capacity of the PUCCH. Alternatively, the following preferred implementation can be adopted:

If the number of bits of the wideband channel information is greater than the maximum load supported by the uplink control channel (PUCCH) (such as 11 bits), then reduce the number of bits of the wideband differential CQI in the wideband channel information, and the reduced number of bits of the wideband differential CQI is used to feed back the PMI information. Through this preferred implementation mode, the LTE system can be better compatible.

Embodiment 4, a feedback method of channel state information

The channel state information feedback method provided in this embodiment is applied to a transmission mode supporting carrier aggregation in an Advanced Long Term Evolution LTE-A system, and supports a dual codebook channel state information feedback method.

The method mainly includes the following steps:

User equipment (UE) feeds back rank indicator (RI) information and component channel information of each carrier to the base station;

Wherein, the RI information and the carrier component channel information are respectively carried in two different report types (Report Type).

The report types of the carrier component channel information in this embodiment will be described in detail below with reference to FIG. 5 .

The content carried in the channel information of each carrier component is determined by the Report Type according to the RI information at the previous moment.

When RI=1 at the previous moment,

Report types that carry carrier component channel information include the following information:

Carrier component channel quality indicator (CQI) information and PMI information in the dual codebook.

When the RI at the previous moment is greater than 1,

Report types that carry wideband channel information include the following information:

Carrier component channel quality indicator (CQI) information for the first codeword stream, differential channel quality indicator (CQI) information for the second codeword stream based on the carrier component CQI information of the first codeword stream , and the PMI information in the dual codebook.

The PMI information in the dual codebook may also represent the precoding matrix index of the sampling combined codebook; the sampling combined codebook is based on the codebook C1 and/or codebook C2 in the dual codebook after sampling or other algorithms Codebook generated jointly.

When the sampling combined codebook is codebook C1, the PMI information in the double codebook is PMI1 information;

When the sample combined codebook is codebook C2, the PMI information of the dual codebook is PMI2 information.

The PMI1 information is selected based on the codebook C1, and the PMI2 information is selected based on the codebook C2.

The feedback channel state information report can be fed back according to the format described in Figure 5, including: RI information report, including carrier component CQI information and PMI information in the dual codebook;

The carrier component CQI information may include the CQI information of the first codeword stream, or the CQI information of the first codeword stream and the differential CQI information of the second codeword stream.

Specifically, when RI is 1, the feedback content is: RI information report, carrier component CQI information, and PMI information in the dual codebook; when RI is greater than 1, the feedback content is: RI information report, carrier Component CQI information, differential carrier component CQI information, and PMI information in the dual codebook.

According to the method of this embodiment, for example, when RI is 1, the user terminal feeds back r-bit RI information, c-bit carrier component CQI information, and p-bit dual codebook PMI information; wherein the dual codebook PMI information is Composed of p1-bit PMI1 information and p2-bit PMI2 information, where p1+p2=p; or, the PMI information of the dual codebook can also be a p-bit codebook index value used to indicate that the precoding matrix is sampling and combining, The sample combined codebook is a codebook of ^2p codewords jointly generated by the dual codebooks C1 and C2.

When the RI is greater than 1, the user terminal feeds back r-bit RI information, c-bit carrier component CQI information, dc-bit differential carrier component CQI information, and q-bit dual codebook PMI information; wherein the dual codebook PMI information can be It is composed of q1-bit PMI1 information and q2-bit PMI2 information; or, the PMI information of the double codebook can also be q-bit used to indicate that the precoding matrix is sampling and combining the codebook index value, wherein the sampling is combined The codebook is a codebook of 2 ^q codewords jointly generated by the dual codebooks C1 and C2.

When RI is 1, and the PMI information of the dual codebook is composed of p1-bit PMI1 information and p2-bit PMI2 information, when p2 is 0, the information fed back by the UE is RI information report, carrier component CQI information and PMI1 in the dual codebook; when the p1 is 0, the UE feeds back the RI information report, carrier component CQI information and PMI2 information in the dual codebook.

When RI is greater than 1, and the PMI information of the dual codebook is composed of q1-bit PMI1 information and q2-bit PMI2 information, when the q2 is 0, the information fed back by the UE is RI information report, carrier component CQI information, differential carrier component CQI information, and PMI1 in the dual codebook; when the q1 is 0, the UE feeds back the RI information report, carrier component CQI information, differential carrier component CQI, and PMI2 information in the dual codebook.

When RI is 1, and the PMI information of the dual codebook is q bits used to indicate that the precoding matrix is sampling the combined codebook index value, when the sampling combined codebook is the C1 codebook in the dual codebook, then The information fed back by the UE is the RI information report, the carrier component CQI information, and the PMI1 in the dual codebook; when the combined sampling codebook is the C2 codebook in the dual codebook, the information fed back by the UE is the RI information report, the carrier Component CQI information and PMI2 in the dual codebook.

When RI is greater than 1, and the PMI information of the dual codebook is q bits used to indicate that the precoding matrix is sampling the combined codebook index value, when the sampling combined codebook is the C1 codebook in the dual codebook, then The information fed back by the UE is RI information report, carrier component CQI information, differential carrier component CQI information, and PMI1 in the dual codebook; when the sample combined codebook is the C2 codebook in the dual codebook, the information fed back by the UE RI information report, carrier component CQI information, differential carrier component CQI information and PMI2 in the dual codebook.

The above r can be 3, c can be 4, dc can be 3, p can be 7, p1 can be 4, p2 can be 3, q can be 4, q1 can be 2, and q2 can be 2. It should be noted that the technical solution of the present invention is not limited to the number of bits set above in actual application.

Through this embodiment, the technical solution of the present invention can meet the limitation requirement that the maximum capacity of the uplink control channel (PUCCH) is the maximum bit amount, and can also meet the feedback requirements for multi-carrier component channel state information in the LTE-A system, and can adapt to Dual codebook channel state information feedback structure in LTE-A system. It should be noted that when the technical solution of the present invention is actually applied, it may exceed the maximum load that can be supported on the PUCCH, and it is necessary to expand the capacity of the PUCCH. For example, the following preferred implementation methods can be adopted:

If the number of bits of each carrier component channel information is greater than the maximum load supported by the uplink control channel (PUCCH) (for example, 11 bits), then reduce the number of bits of the carrier component differential CQI in each carrier component channel information, and the differential CQI reduces The number of bits is used to feed back PMI information. Through this preferred implementation mode, the LTE system can be better compatible.

It should be noted that, in the foregoing embodiments of the present invention, channel information of different carrier components needs to be transmitted separately in different carrier component feedback reports.

Embodiment 5. Channel State Information Feedback Device

As shown in FIG. 6, the channel state information feedback device provided in this embodiment mainly includes a setting module 22 and a feedback module 24, wherein:

A setting module 22, configured to set an indicator (PMI) carrying a precoding matrix in broadband channel information and/or carrier component channel information;

The feedback module 24, the connection setting module 22, is used to feed back RI information, broadband channel information and/or component channel information of each carrier to the base station;

Among them, RI information, wideband channel information, and carrier component channel information are respectively carried in three different report types (Report Type).

Preferably, the wideband channel information and/or the content carried in the channel information of each carrier component is determined by the report type (Report Type) according to the information at the previous moment.

Preferably, the setting module 22 is also used to reduce the number of bits of each carrier component channel information or broadband channel information when the number of bits of each carrier component channel information or broadband channel information is greater than the maximum load bit number supported by the uplink control channel (PUCCH). The number of bits of the differential CQI (carrier component differential CQI or wideband differential CQI) in the information, and the reduced number of bits of the differential CQI is used to feed back the PMI information.

Those skilled in the art should understand that each module or each step of the present invention described above can be realized by a general-purpose computing device, and they can be concentrated on a single computing device, or distributed on a network formed by a plurality of computing devices, Optionally, they can be implemented with program codes executable by computing devices, thus, they can be stored in storage devices and executed by computing devices, or they can be made into individual integrated circuit modules, or multiple of them Each module or step is realized as a single integrated circuit module. As such, the present invention is not limited to any specific combination of hardware and software.

Although the embodiments disclosed in the present invention are as above, the described content is only an embodiment adopted for the convenience of understanding the present invention, and is not intended to limit the present invention. Anyone skilled in the technical field to which the present invention belongs can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed by the present invention, but the patent protection scope of the present invention, The scope defined by the appended claims must still prevail.

Claims (12)

1. A feedback method for channel state information, characterized in that, comprising: The user equipment UE feeds back rank indicator RI information, wideband channel information and/or component channel information of each carrier to the base station; Among them, RI information, wideband channel information, and carrier component channel information are respectively carried in different report types; Among them, for the single codebook feedback structure: The wideband channel information includes wideband CQI information and wideband PMI information; the carrier component channel information includes CQI information and PMI information on each carrier component; For the dual codebook feedback structure, and when the UE feeds back RI information, wideband channel information and channel information of each carrier component to the base station: The wideband channel information includes wideband CQI information and PMI1 information in the dual codebook; the carrier component channel information includes CQI information on each carrier component and PMI2 information in the dual codebook; For the dual codebook feedback structure, and when the UE feeds back RI information and broadband channel information or component channel information of each carrier to the base station: The wideband channel information includes wideband CQI information and PMI information in a dual codebook; the carrier component channel information includes CQI information on each carrier component and PMI information in a dual codebook. 2. The method according to claim 1, characterized in that: The contents of the wideband channel information and/or the channel information of each carrier component are determined by the report type according to the RI information at the previous moment. 3. The method according to claim 1, characterized in that: For a single codebook feedback structure, when the RI at the previous moment is 1: The report type carrying the wideband channel information includes wideband CQI information and wideband PMI information; The report type carrying the channel information of the carrier component includes CQI information on the current component carrier and PMI information on the current component carrier; For a single codebook feedback structure, when the RI at the previous moment is greater than 1: The report type carrying the wideband channel information includes wideband CQI information for the first codeword stream, wideband differential CQI for the second codeword stream based on the wideband CQI information of the first codeword stream information, and broadband PMI information; The report type carrying the carrier component channel information includes the carrier component CQI information for the first codeword stream on the current carrier component, and the carrier component information for the second codeword stream based on the first codeword stream The differential carrier component CQI information of the CQI information, and the PMI information on the current carrier component. 4. The method according to claim 3, characterized in that: For the single codebook feedback structure, the wideband PMI information and the PMI information of each carrier component are selected based on the same codebook. 5. The method according to claim 1, characterized in that: For the dual codebook feedback structure, when the RI at the previous moment is 1: The report type carrying the wideband channel information includes wideband CQI information and PMI1 information in the dual codebook; the report type carrying the carrier component channel information includes CQI information on the current carrier component and PMI2 information in the dual codebook ; Alternatively, the report type carrying the wideband channel information includes wideband CQI information and PMI information in the dual codebook; the report type carrying the carrier component channel information includes CQI information on the current carrier component and the PMI information in the dual codebook PMI information; For the dual codebook feedback structure, when the RI at the previous moment is greater than 1: The report type carrying the wideband channel information includes wideband CQI information for the first codeword stream, wideband differential CQI for the second codeword stream based on the wideband CQI information of the first codeword stream information, and PMI1 information in the dual codebook; the report type carrying the carrier component channel information includes the carrier component CQI information for the first codeword stream on the current carrier component, and the carrier component CQI information for the second codeword stream The differential carrier component CQI information based on the carrier component CQI information of the first codeword stream, and the PMI2 information in the dual codebook; Alternatively, the report type carrying the wideband channel information includes wideband CQI information for the first codeword stream, and wideband CQI information for the second codeword stream based on the wideband CQI information for the first codeword stream. Differential CQI information, and PMI information in the dual codebook; the report type carrying the carrier component channel information includes the carrier component CQI information for the first codeword stream on the current carrier component, and the carrier component CQI information for the second codeword stream The differential carrier component CQI information of the word stream based on the carrier component CQI information of the first codeword stream, and the PMI information in the dual codebook. 6. The method according to claim 5, characterized in that: For the dual-codebook feedback structure, the PMI1 information in the dual-codebook is selected based on the codebook C1 in the dual-codebook, and the PMI2 information in the dual-codebook is selected based on the codebook C2 in the dual-codebook. Selected. 7. The method according to claim 5, characterized in that: For the dual codebook feedback structure, The PMI information in the dual codebook is formed according to the PMI1 information in the dual codebook and/or the PMI2 information in the dual codebook; Or, the PMI information in the dual codebook indicates the precoding matrix index of the sample combined codebook; Wherein, the sampling combined codebook is a codebook generated according to codebook C1 and/or codebook C2 in the dual codebook. 8. The method of claim 7, wherein: When the RI is 1, the p-bit PMI information in the dual codebook is composed of p1-bit PMI1 information and p2-bit PMI2 information, where p1+p2=p; When RI is greater than 1, the PMI information of q bits in the dual codebook is composed of PMI1 information of q1 bits and PMI2 information of q2 bits, where q1+q2=q; Wherein, the p1, p2, q1 and q2 are all integers greater than or equal to 0. 9. The method of claim 8, wherein: When the RI is 1 and p1 is 0, the information fed back by the UE is RI information report, wideband CQI information and PMI2 information in the dual codebook; When the RI is 1 and p2 is 0, the information fed back by the UE is RI information report, wideband CQI information and PMI1 in the dual codebook; When the RI is greater than 1 and q1 is 0, the information fed back by the UE is RI information report, wideband CQI information, differential wideband CQI and PMI2 information in the dual codebook; When the RI is greater than 1 and q2 is 0, the information fed back by the UE is RI information report, wideband CQI information, differential wideband CQI information and PMI1 information in the dual codebook. 10. The method of claim 7, wherein: When the sampling combined codebook is codebook C1 in the dual codebook, the PMI information in the dual codebook is PMI1 information in the dual codebook; When the combined sampling codebook is codebook C2 in the dual codebook, the PMI information in the dual codebook is PMI2 information in the dual codebook. 11. A feedback device for channel state information, characterized in that it includes a setting module and a feedback module, wherein: The setting module is used to set the indicator PMI carrying the precoding matrix in the broadband channel information and/or the carrier component channel information; The feedback module is configured to feed back rank indicator RI information, and the broadband channel information and/or each carrier component channel information to the base station; Wherein, the RI information, wideband channel information and carrier component channel information are respectively carried in three different report types; Among them, for the single codebook feedback structure: The wideband channel information includes wideband CQI information and wideband PMI information; the carrier component channel information includes CQI information and PMI information on each carrier component; For the dual codebook feedback structure, and when the UE feeds back RI information, wideband channel information and channel information of each carrier component to the base station: The wideband channel information includes wideband CQI information and PMI1 information in the dual codebook; the carrier component channel information includes CQI information on each carrier component and PMI2 information in the dual codebook; For the dual codebook feedback structure, and when the UE feeds back RI information and broadband channel information or component channel information of each carrier to the base station: The wideband channel information includes wideband CQI information and PMI information in a dual codebook; the carrier component channel information includes CQI information on each carrier component and PMI information in a dual codebook. 12. The device of claim 11, wherein: The content in the broadband channel information and/or the channel information of each carrier component is determined by the report type according to the RI information at the previous moment.