WO2012062122A1

WO2012062122A1 - Method and terminal for feeding back channel state information

Info

Publication number: WO2012062122A1
Application number: PCT/CN2011/076643
Authority: WO
Inventors: 陈艺戬; 李儒岳; 徐俊; 唐红
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-11-09
Filing date: 2011-06-30
Publication date: 2012-05-18
Also published as: CN101986588B; CN101986588A

Abstract

The present invention discloses a method and a terminal for feeding back channel state information. The method includes that: a user equipment (UE) sets multiple Rank Indication (RI) groups; the UE determines an RI; when the RI is updated or the RI group of the RI changes relative to the RI group of the RI fed back last time, the UE reports a feedback report carrying a Precoder Type Indication (PTI) value which is zero, and feeds back channel state information according to the PTI which is zero. Thus, the feedback accuracy rate of channel state information is increased and the system performance loss is reduced.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular to a channel state information feedback method and a terminal. Background Art In a wireless communication system, a transmitting end and a receiving end often use a plurality of antennas to obtain a higher rate in a spatial multiplexing manner. Compared with the general spatial multiplexing method, an enhanced technique is that the receiving end feeds back the channel information to the transmitting end, and the transmitting end uses the transmitting precoding technology according to the obtained channel state information, which can greatly improve the transmission performance. In the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE), the channel state information generally includes but is not limited to the following: Feature vector information of the channel, and often It is called precoding information. Since the codebook is used to feed back the precoding information, it is often referred to as a Precoding Matrix Indicator (PMI) information. Channel Quality Information (CQI), which characterizes channel quality information, characterizes channel quality in a recommended modulation and coding scheme. Higher-order modulation and coding schemes indicate better performance. LTE supports 16 CQI level selections. , As shown in Table 1. Table 1 Schematic diagram of CQI level of LTE system

The rank information of the channel (Rank Indication, hereinafter referred to as RI) indicates the number of layers of spatial multiplexing that the channel can support, sometimes referred to as layer information. RI is a positive integer. In general, the value of RI does not exceed the number of transmitted antennas Nt. In the traditional feedback, RI/PMI/CQI are matched with each other. For example, the PMI is based on the RI value to determine the corresponding codebook. CQI is based on RI and PMI, RI feedback. And RI/PMI is another

The CQI value is the most important criterion to determine. There is a strong interrelationship between the three. In the LTE standard, the minimum feedback unit of the channel information is a subband, and the subband is composed of a plurality of resource blocks (RBs), and each RB is composed of multiple resource elements (Resource Element, Referred to as 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 sub-band, or a plurality of sub-bands (Multi-Subbands) or a part of bandwidth (Bandwidth Parts, referred to as BP), and a wideband ( Wideband).

There are many feedback modes in LTE, and there are different feedback modes in different transmission modes. Here, the feedback mode in the transmission mode of closed-loop spatial multiplexing is mainly concerned. The feedback methods of PMI/RI/CQI include the following two types:

(1) Periodic feedback, mainly on the feedback of the Physical Uplink Control Channel (PUCCH). Periodic feedback is the system that must be configured and is the most common configuration.

(2) Aperiodic feedback, which is carried on the Physical Uplink Shared Channel (PUSCH). Aperiodic feedback is an occasional triggering feedback, which is an auxiliary feedback method. Although it can improve the accuracy, its overhead is relatively large.

There are four types of feedback (Type) in the channel information periodic feedback mode on PUCCH in LTE, and closed loop spatial multiplexing involves the first three. Feedback Type 1 : Sub-band CQI that feeds back the sub-band (SB) selected by the UE; Report Type 2: CQI and PMI (W) information of the feedback wideband (WB); Feedback Type 3 : Feedback RI information; Feedback Type 4 : Only feedback broadband (WB) CQI. FIG. 1 is a schematic diagram of feedback of PUCCH Mode 2 - 1 in an LTE system according to the related art. As shown in FIG. 1 , feedback of PMI and CQI is based on corresponding RI information. The Long Term Evolution Advanced (LTE-A) system, as an evolutionary standard for LTE, supports larger system bandwidths (up to 100 MHz) and is backward compatible with existing LTE standards. In order to improve the coverage and throughput of the cell edge, LTE-A proposes some feedback enhancement techniques, mainly to enhance the feedback accuracy of the codebook, which can improve the evolution of International Mobile Telecommunications (IMT-) Advance) The spectrum utilization of the system and the mitigation of spectrum resources are scarce. The feedback enhancement technique is:

(1) Feedback two PMI indications to indicate precoding/feature vector information

(2) One PMI indicates the properties of a wideband or long-term channel, and the other PMI indicates the properties of a band or a short-term channel. The feedback aspect of channel information proposes a structure based on dual PMI feedback. The two PMIs are the first PMI (PMI 1 ) and the second PMI ( PMI2 ) respectively. Since the two PMIs often implicitly indicate two matrices, Therefore, the matrices W1 and W2 are often used to correspond to the two PMIs.

The Rank1 - 4 codebook format of the LTE-A 8-antenna system is shown in Table 2-5 below. The Rank5-8 codebook is similar.

Table 2 LTE-A Rank1 code form form

Table 3 LTE-A Rank2 code form form

Table 4 LTE-A Rank3 code form form

Table 5 LTE-A Rank4 code form form

In the LTE-A system, due to the feedback of PMI 1 and PMI2, the feedback mode design and the feedback in LTE have some changes in consideration of the overhead limitation. The main change is the occurrence of the lbit precoding type indication (Precoder Type Indication, referred to as PTI. This information is primarily intended to be used in dynamic switching feedback reports. 2 is a schematic diagram of feedback in one cycle according to the related art in the case of PTI=0. As shown in FIG. 2, when PTI=0, the period of PMI1 is greater than or equal to the period of WB PMI2&CQI, which is a Μ-fold relationship, and Μ is greater than or equal to 1 The integer is configured by higher layer signaling; when PTI=0, the period of RI&PTI is greater than or equal to the period of PMI1, which is the relationship of MRI times, and MRI is an integer greater than or equal to 1. 3 is a schematic diagram of feedback in one cycle according to the related art in ΡΤΙ=1. As shown in FIG. 3, when ΡΤΙ=1, the period of WB PMI2&CQI is greater than or equal to the period of SB PMI2&CQI, which is J*K+ 1, J is current. The number of BPs corresponding to the bandwidth. K is the parameter of the high-level configuration and is an integer. When PTI=1, the period of RI&PTI is greater than or equal to WB PMI2&CQI, which is also MRI times. The MRI is uniformly configured by the upper layer. For the case of PTI=0 and ΡΤΙ=1, the periodic configuration of each report is independent. The configuration of the period is generally the report with the fastest feedback frequency (minimum period) (WB PMI2&CQI when PTI=0, SB PMI2&CQI when PTI=1) The period is the smallest unit, denoted as Nc, and then configure the periodic relationship between the reports.

The method for performing channel state information feedback in LTE-A, the case where the RI value is updated and PTI=1, FIG. 4 is a schematic diagram of the new RI and PMI1 mismatch according to the related art, and the UE should be from New RI as shown in FIG. PMI1 and PMI2 corresponding to the channel information are found in the corresponding codebook, and at this time, PMI1 is still PMI1 of 4 之前 before the RI update, and the PMI1 is an index suitable for the previous channel found in the codebook corresponding to the old RI. , is the PMI1 that matches the old RI. Since the channel state has changed, if the matching codeword is found according to the old RI and the corresponding codeword is not up to the feedback effect of the channel information update, the performance loss will occur, and if the performance is new, The RI to determine the PMI2, CQI and other information will lead to the problem that the new RI does not match the PMI1, and the wrong CSI information is obtained, and the performance loss is more serious. In summary, the channel state information feedback method in the related art may cause channel state information to be inaccurate, thereby causing a problem of system performance loss. SUMMARY OF THE INVENTION A primary object of the present invention is to provide a channel state information feedback method and a terminal to solve at least the channel state information feedback method in the related art, which may cause channel state information to be inaccurate, thereby causing a problem of system performance loss. In order to achieve the above object, according to an aspect of the present invention, a channel state information feedback method is provided for use in an eight antenna system. The channel state information feedback method according to the present invention includes: the terminal (UE) sets a plurality of rank information (RI) groups; the UE determines the RI; when the RI update or the RI group in which the RI is located changes with respect to the RI group in which the RI of the last feedback is located The UE reports a feedback report carrying a precoding type indication (PTI) value of 0, and performs channel state information feedback according to the PTI being 0. The RI group includes one or more RIs.

The RI group was: RI group 1 = {RI = 1, RI = 2}, RI group 2 = {RI = 3, RI = 4}, RI group 3 = {RI = 5, RI = 6, RI = 7, RI =8} ; or RI group 1 = {RI = 1, RI = 2}, RI ^ JL 2 = {RI = 3, RI = 4}, RI group 3 = {RI = 5, RI = 6, RI = 7 , RI group 4 = {RI = 8}. The method further includes: canceling the feedback RI in a time interval between two adjacent feedback reports carrying the PTI value of 0. The method further includes: feeding back RI information in the same RI group within a time interval between two adjacent feedback reports carrying the PTI of 0. In order to achieve the above object, according to another aspect of the present invention, a channel state information feedback method is also provided, which is applied to an eight antenna system. The channel state information feedback method of the present invention includes: configuring a second time interval of the feedback report of the feedback report indicating that the PTI value is 0 in the feedback period of the channel state information, and the second time interval of the feedback report having the PTI value of 1 The first time interval is the time interval between the reporting time of the feedback report with the PTI being 0 and the reporting time of the next PTI value, and the second time interval is the reporting time of the feedback report with the PTI of 1 and the reporting time of the next PTI value. Interval; feedback channel status information is fed back using the feedback period. The three feedback types reported in the feedback report indicating that the PTI is 0 or 1 in the feedback period are the same. In order to achieve the above object, according to still another aspect of the present invention, a terminal is also provided. The terminal according to the present invention comprises: a setting module, which is set as a plurality of rank information (RI) groups; a determining module, configured to determine an RI; an upper 4艮 module, set to be the RI group in which the RI update or the RI is located relative to the previous feedback When the RI group in which the RI is located changes, the upper 艮 carries a feedback report with a precoding type indication ( ΡΤΙ ) value of 0; and the feedback module is set to perform channel state information feedback according to ΡΤΙ 0. The terminal further includes: a first processing module, configured to cancel the feedback RI in a time interval between two adjacent feedback reports carrying the PTI value of 0. The terminal further includes: a second processing module, configured to feed back RI information in the same RI group within a time interval between two adjacent feedback reports carrying a PTI value of 0. In order to achieve the above object, according to still another aspect of the present invention, a terminal is also provided. The terminal according to the present invention includes: a time configuration module, wherein the first time interval of the feedback report with the PTI value of 0 in the feedback period configured to configure the channel state information is equal to the second time interval of the feedback report with the PTI of 1, wherein The time interval is the interval between the reporting time of the feedback report with the PTI value of 0 and the reporting time of the next PTI value. The second interval is the interval between the reporting time of the feedback report with the PTI value of 1 and the reporting time of the next PTI value. The information feedback module is configured to use feedback feedback channel feedback channel status information. The time configuration module includes: a configuration sub-module, configured to respectively configure the feedback period to have the same period of the three feedback types in the feedback report with the PTI value of 0 or 1. With the present invention, the terminal determines the RI, and when the RI is updated or the RI group in which the RI is located changes with respect to the RI group that was last fed back, a feedback report with a PTI value of 0 is reported, and the channel is performed according to a feedback mode corresponding to the PTI being 0. The feedback of the status information solves the channel state information feedback method in the related art, which causes the channel state information to be inaccurate, thereby causing the system performance loss problem, and achieves the effect of improving the channel state information feedback correct rate and reducing the system performance loss. . BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a schematic diagram of feedback of PUCCH Mode 2-1 in an LTE system according to the related art; FIG. 2 is a schematic diagram of feedback in one cycle according to PTI=0 in the related art; FIG. 3 is a related art according to the related art. FIG. 4 is a schematic diagram of the new RI and PMI1 mismatch in the related art; FIG. 5 is a schematic diagram of error propagation according to the related art PTI=0 and different periodic configurations: 6 is a first flowchart of a channel state information feedback method according to an embodiment of the present invention; FIG. 7 is a second flowchart of a channel state information feedback method according to an embodiment of the present invention; FIG. 8 is a terminal in an embodiment of the present invention; Figure 1 is a block diagram of a preferred first structure of a terminal in accordance with an embodiment of the present invention; Figure 10 is a block diagram showing a second structure of a terminal according to an embodiment of the present invention; and Figure 11 is a block diagram of the present invention; A preferred second structural block diagram of the terminal of the embodiment of the invention. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. The present embodiment provides a channel state information feedback method. FIG. 6 is a first flowchart of a channel state information feedback method according to an embodiment of the present invention. As shown in FIG. 6, the method includes: Step S602: The terminal sets multiple Rank information (RI) group. Step S604: The terminal determines the RI. Step S606: When the RI update or the RI group in which the RI is located changes with respect to the RI group in which the RI of the last feedback is changed, the UE reports a feedback report with a PTI value of 0, and performs channel status according to a feedback mode corresponding to the PTI being 0. information feedback. Through the above steps, when the RI update or the RI group in which the RI is changed, the PTI=0 is reported at the same time, and the channel state information feedback is performed according to the feedback mode corresponding to the PTI=0, which overcomes the related art when the RI update or the RI group changes. Still searching for the codebook corresponding to PMI1 according to the old RI, resulting in inaccurate channel state information feedback, achieving the correct channel channel information feedback correct rate and reducing the system performance loss effect. Preferably, the RI group includes one or more RIs. With the preferred embodiment, the RI group includes one or more RIs, and the RIs are grouped to improve the accuracy of the RI report. Preferably, the above RI group is: RI group 1 = {RI = 1, RI = 2}, RI group 2 = {RI = 3, RI = 4}, RI group 3 = {RI = 5, RI = 6, RI =7, RI=8} or RI group 1={RI=1, RI=2}, RI group 2={RI=3, RI=4}, RI group 3={RI=5, RI=6, RI=7}, RI group 4={RI=8}. According to the preferred embodiment, the RI reporting accuracy is improved by dividing the RI into a plurality of groups for control. Preferably, the method further includes: canceling the feedback RI in a time interval between two adjacent feedback reports with PTI values of 0. With the preferred embodiment, during the time interval between feedback reports with a PTI of 0, the value of RI does not change, the RI value feedback is cancelled, and the bit overhead of the system is reduced. Preferably, the method further includes: feeding back RI information in the same RI group within a time interval between two adjacent feedback reports with PTIs of 0. With the preferred embodiment, during the time interval between the feedback reports with a PTI of 0, although the value of the RI changes, but within the same RI group, less information is used to indicate the RI in the RI group. The RI information inside reduces the bit overhead of the system. The present embodiment provides a channel state information feedback method. FIG. 7 is a second flowchart of a channel state information feedback method according to an embodiment of the present invention. As shown in FIG. 7, the method includes: Step S702: Configuring channel state information The first time interval of the feedback report with the precoding type indication (PTI) being 0 in the feedback period is equal to the second time interval of the feedback report with the PTI being 1, wherein the first time interval is the reporting time of the feedback report with the PTI being 0. The time interval between the reporting time of the next PTI value and the time interval of the reporting time of the next PTI value. Step S704: Feedback channel state information is fed back using a feedback period. Through the above steps, the first time interval of the feedback 4 report that the PTI is 0 in the feedback period of the channel state information is equal to the second time interval of the feedback report with the PTI of 1, the PTI=0 is incorrectly overcome in the related art. When the ground detection is ΡΤΙ=1 or ΡΤΙ=1 is incorrectly detected as PTI=0, the mismatch between the UE and the eNodeB is caused, and all the feedbacks at the time cannot be correctly received, which causes the feedback system to be defective (Figure 5 is based on A schematic diagram of error propagation of PTI=0 and different periodic configurations in the related art, as shown in FIG. 5, improves the accuracy of channel state information feedback and the robustness of the feedback system. Preferably, a preferred embodiment of step S702 is described below. The three feedback types reported in the feedback report with ΡΤΙ 0 or 1 in the feedback period are reported to have the same period. With the preferred embodiment, the period parameters of the three feedback type reports in the feedback report with ΡΤΙ 0 or 1 are set to be the same, improving the robustness of the feedback system. Embodiment 1 This embodiment provides a channel state information feedback method. In this embodiment, the UE determines the PTI value, the RI value, the PMI1 value (WB), the WB PMI2 or the SB according to the channel information during the feedback process. PMI2 value, WB CQI or SB CQI value; Then, the corresponding reporting policy is selected, and the reporting mode may be dynamically changed, mainly for a set reporting method indicated by PTI=0 and a reporting method indicated by ΡΤΙ=1. The upload method does not change until the threshold is updated. In this embodiment, the time point of 4 艮 RI=2 and PTI=0 on one UE is the starting point; before the PTI value is updated, the feedback is performed according to the manner shown in FIG. 2; the UE before the next feedback RI/PTI The time point of the next RI/PTI reported by the next 艮PMI1 and WB PMI2&CQL (only according to the previous RI=2, PTI=0 feedback period configuration can calculate the next time point) The UE can upload 4 new RIs. Value and PTI value, £Set 4 RI=2 on the UE, PTI=1, and the UE will repeatedly 4 艮WB PMI2&CQI and SB PMI2&CQL 4 艮 on the next RI/PTI before the next RI/PTI time point ( The previous RI=2, PTI=1 feedback period configuration can calculate the next time point) 4艮RI=3 on the UE, and 4艮PTI=0 on the UE, the UE will apply 4艮PMI multiple times before the next RI/PTI 1 and WB PMI2 & CQI. With jt匕4 dance, when the RI value does not change, you can go up to 4艮PTI=0 or 1. When the RI value changes, the upper 4艮PTI=0. Embodiment 2 This embodiment provides a channel state information feedback method. In this embodiment, similar to Embodiment 1, the UE determines the threshold, the RI value, and the PMI1 value (WB) according to the channel information in the feedback process. WB ΡΜΙ2 or SB PMI2 value, WB CQI or SB CQI value; then select the corresponding upper 4艮 strategy, the reporting method may be dynamically changed, mainly a set of reporting methods indicated by PTI=0 and a set of ΡΤΙ=1 indications On the way. The ~3⁄4 mode will not change until the threshold is updated. In this embodiment, a time point of 4 艮 RI=2 and PTI=0 on one UE is a starting point; before the PTI value is updated, feedback is performed according to the manner shown in FIG. 2; the UE before the next feedback RI/PTI Sub-calculation and 4 艮 PMI1 and WB PMI2 & CQL The next RI/PTI 4 艮 time point (previous RI=2, PTI=0 feedback period configuration can calculate the next time point) UE can upload 4 new RI Value and PTI value, £Set 4UERI=2 on the UE, PTI=1, the UE will repeatedly 4WW PMI2&CQI and SB PMI2&CQL before the next RI/PTI time point. 4 艮 at the next RI/PTI (the previous RI=2, PTI=1 feedback period configuration can calculate the next time point) 4艮RI=3 on the UE, and 4艮PTI=0 on the UE, UE Four times before the next RI/PTI, 4 艮 PMI1 and WB PMI2 & CQL Preferably, between the two RI/PTI=0 feedbacks, the RI value of the RI/PTI = 1 is not occurred. The change is made, so that only the PTI can be fed back without feedback of the RI information, which saves feedback overhead and improves feedback reliability. Embodiment 3 In this embodiment, a channel state information feedback method is provided. In this embodiment, the UE determines the PTI value, the RI value, the PMI1 value (WB), the WB PMI2 or the data according to the channel information in the feedback process. SB PMI2 value, WB CQI or SB CQI value; Then, the corresponding reporting policy is selected, and the reporting mode may be dynamically changed, mainly for a set reporting method indicated by PTI=0 and a reporting method indicated by ΡΤΙ=1. The upload method does not change until the threshold is updated. In this embodiment, multiple RI Groups are defined, and the RI Group includes values of one or more RIs, for example:

RI Group 1={RI=1, RI=2} RI Group2={RI=3, RI=4} RI Group3={RI=5, RI=6, RI=7, RI=8}„ or

RI Group 1={RI=1, RI=2} RI Group2={RI=3, RI=4} RI Group3={RI=5, RI=6, RI=7} RI Group4={RI=8}„ It should be noted that the foregoing manner is only a preferred division manner of the RI group. In this embodiment, the RI group division includes but is not limited to the division manner of the RI group. When the RI value of the upper 4 在 changes between the groups, 4 艮 PTI=0 on the UE to update the feedback of PMI1. When the RI value of the upper 4 变 changes within the group, the UE may perform any of 4 艮 PTI=0 or 1. Set a time point of 4艮RI=2 on one UE and PTI=0 as the starting point; before the PTI value is updated, feedback is performed according to the mode shown in Figure 2; the UE calculates and counts multiple times before the next feedback RI/PTI 4艮PMI1 and WB PMI2&CQL The time point of 4艮 on the next RI/PTI (the previous RI=2, PTI=0 feedback period configuration can calculate the next time point) The UE can upload 4 new RI values and PTI values. Since the RI changes within the group of Groupl, the PTI can be 4艮0 or 1. £ set to 4UERI=1, PTI=1 on the UE, and the UE repeatedly 4WW PMI2&CQI before the next RI/PTI time point. And SB PMI2&CQL The next RI/PTI 4 艮 time point (the first RI=1, PTI=1 feedback period configuration can calculate the next time point) 4艮RI=3 on the UE, and the UE should be 4艮PTI =0, the UE repeatedly pushes 4艮 PMI1 and WB PMI2&CQL before the next RI/PTI, and so on. When the Old RI value and the New RI value change or do not change within a certain group, 4 PTI can be performed. =0 or 1, when the Old RI value and the New RI value change between a group, it should be 4 艮 PTI=0. Embodiment 4 In this embodiment, a channel state information feedback method is provided, which is similar to Embodiment 3, but the RI information used only indicates the Group between the previous PTI=0 report and the next ΡΤΙ=0 report. The RI information inside can be fed back with fewer bits. E.g:

RI=1, PTI=0 and the next PTI=0 report, the RI only needs lbit information for feedback, indicating RI=1 or 2;

RI=3, between PTI=0 and the next PTI=0 report, the RI only needs lbit information for feedback, indicating RI=3 or 4. Embodiment 5 This embodiment provides a channel state information method. In the configuration period of this embodiment, the time interval between configuring PTI=0 and the next 艮4艮 is equal to ΡΤΙ=1 to the next ΡΤΙ interval. And use this configuration to provide feedback on channel status information. There are two ways to do this:

(1) Method 1: For PTI=0 and PTI=1, the three reports share the same cycle parameters. For example: The three reports indicated by PTI = 0 are listed as Report A0, Report B0, and Report CO in the feedback cycle from large to small; the three reports indicated by PTI = 1 are in the feedback cycle from big to small. Report Al, Report B Report CI, where Report CI and Report CO are equal, Report B l and Report BO are equal, Report A 1 and Report AO are equal;

(2) Method 2

Report CI and Report CO are equal, Report B l is M1 times of Report CI cycle, Report BO is MO times of Report CO cycle, Report Al is Nl times of Report B l cycle, and Report AO is NO times of Report BO cycle; Where ΜΙ, ΜΟ, ΝΙ, ΝΟ are all integers, and Μ1 *Ν1=Μ0*Ν0. or

Report C1 and Report CO cycles are not equal, respectively Ncl and NcO (in ms), Report B l is M1 times of Report Cl cycle, Report B0 is MO times of Report CO cycle, Report Al is N 1 of Report B 1 cycle Times, Report AO is NO times of the Report BO period; where ΜΙ, ΜΟ, ΝΙ, ΝΟ, Ncl, NcO are all integers, and, M1 * N1 * Ncl = M0 * N0 * NcO. Embodiment 6 This embodiment provides a channel state information feedback method. The configuration manner of this embodiment is the same as that shown in Embodiment 5. For ΜΙ, ΜΟ, a high-level parameter can be commonly configured, and the relationship between them is determined in advance, such as Μ1. =ΚχΜ0 or Μ0=ΚχΜ1. For ΝΙ, ΝΟ can be configured with a high-level parameter and pre-determine the relationship between them, such as Nl= JxNO or M0= J Nl o K and J are positive integers. This embodiment provides a terminal. FIG. 8 is a first structural block diagram of a terminal according to an embodiment of the present invention. As shown in FIG. 8, the terminal includes: a setting module 82, a determining module 84, a reporting module 86, and a feedback module 88. The foregoing structure is described in detail below. : The setting module 82 is configured to set a plurality of rank information (RI) groups; the determining module 84 is connected to the setting module 82, and is set to determine the RI; the upper 4艮 module 86 is connected to the determining module 84, and is set to be determined at the determining module 84. When the RI update or the RI group in which the RI is located changes with respect to the RI group in which the RI of the last feedback is changed, the report carries a feedback report with a precoding type indication (PTI) value of 0; the feedback module 88 is connected to the reporting module 86. And set to perform channel state information feedback according to a feedback mode corresponding to PTI being 0. 9 is a block diagram of a preferred first structure of the terminal in the embodiment of the present invention. As shown in FIG. 9, the terminal further includes: a first processing module 92 and a second processing module 94. The foregoing structure is described in detail below: A processing module 92 is configured to cancel the feedback RI during a time interval between two adjacent feedback reports carrying a PTI value of zero. The second processing module 94 is configured to feed back the RI information in the same RI group within a time interval between two adjacent feedback reports carrying the PTI value of 0. This embodiment provides a terminal. FIG. 10 is a second structural block diagram of a terminal according to an embodiment of the present invention. As shown in FIG. 10, the terminal includes: a time configuration module 102 and an information feedback module 104. The foregoing structure is described in detail: a time configuration module 102, The first time interval of the feedback 4 report with the PTI value of 0 in the feedback period configured to configure the channel state information is equal to the second time interval of the feedback 4 report with the PTI being 1, wherein the first time interval is a PTI value of 0. The time interval between the reporting time of the feedback report and the reporting time of the next PTI value, and the second time interval is the time interval between the reporting time of the feedback report with the PTI value of 1 and the reporting time of the next PTI value; the information feedback module 104, the connection The time configuration module 102 is configured to use feedback feedback to feed back channel state information. 11 is a block diagram of a preferred second structure of a terminal according to an embodiment of the present invention. The time configuration module 102 includes: a configuration sub-module 1022. The above structure will be described below. The configuration sub-module 1022 is configured to respectively configure the three feedback types in the feedback report with the PTI value of 0 or 1 in the feedback period to be the same. Through the foregoing embodiment, a channel state information feedback method and a terminal are provided. According to the method, when the RI update or the RI group where the RI is changed, the channel is simultaneously performed by the PQ=0 and the feedback mode corresponding to the PTI=0. State information feedback overcomes the related art, when the RI is updated or the RI group is changed, Still searching for the corresponding PMI according to the old RI, resulting in inaccurate channel feedback information, achieving the correct rate of channel state information feedback, and reducing the performance loss of the system. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A channel state information feedback method applied to an eight-antenna system, comprising:

The terminal UE sets a plurality of rank information RI groups;

The UE determines an RI;

When the RI is updated or the RI group in which the RI is located changes with respect to the RI group in which the RI was last fed back, the UE reports a feedback report carrying a precoding type indicating PTI value of 0, and performs channel according to PTI 0. Status feedback.

2. The method of claim 1, wherein the RI group comprises one or more RIs.

3. The method according to claim 2, wherein the RI group is:

RI group 1 = {RI = 1, RI = 2}, RI group 2 = {RI = 3, RI = 4}, RI group 3 = {RI = 5, RI = 6, RI = 7, RI = 8}; Or

RI group 1 = {RI = 1, RI = 2}, RI group 2 = {RI = 3, RI = 4}, RI group 3 = {RI = 5, RI = 6, RI = 7, RI group 4 = { RI=8}.

4. The method according to claim 1, further comprising:

The feedback RI is canceled in a time interval between two adjacent feedbacks that carry the PTI value of 0.

5. The method according to claim 1, further comprising:

The RI information in the same RI group is fed back during the time interval between two adjacent feedback reports carrying the PTI of 0.

6. A channel state information feedback method applied to an eight antenna system, comprising:

The first time interval of the feedback report indicating that the PTI value is 0 in the feedback period of the channel state information is equal to the second time interval of the feedback report with the PTI value of 1, wherein the first time interval is The time interval between the reporting time of the feedback report with the PTI being 0 and the time of the next PTI value is 4, and the second time interval is the reporting time of the feedback report with the PTI being 1 and the next PTI value. Time interval of reporting time; using the feedback period to feed back channel state information.

The method according to claim 6, wherein the three feedback types reported in the feedback report indicated by the PTI being 0 or 1 in the feedback period are the same.

8. A terminal, including:

Setting a module, set to multiple rank information RI groups;

Determining the module, setting to determine the RI;

The reporting module is configured to: when the RI update or the RI group in which the RI is located changes relative to the RI group in which the RI is last fed back, the upper layer carries a feedback report indicating that the precoding type indicates a PTI value of 0;

The feedback module is configured to perform channel state information feedback according to a PTI of 0.

9. The terminal according to claim 8, further comprising:

The first processing module is configured to cancel feedback of the RI in a time interval between two adjacent feedback reports carrying the PTI value of 0.

10. The terminal according to claim 8, further comprising:

The second processing module is configured to feed back RI information in the same RI group within a time interval between two adjacent feedback reports carrying the PTI value of 0.

11. A terminal comprising:

a time interval, wherein the first time interval of the feedback report indicating that the PTI value is 0 in the feedback period of the channel state information is equal to the second time interval of the feedback report with the PTI being 1, wherein the The time interval is the time interval between the reporting time of the feedback report with the PTI value of 0 and the reporting time of the next PTI value, and the second time interval is the reporting time of the feedback report with the PTI value of 1. The time interval of the last 4 艮 time of the PTI value;

The information feedback module is configured to use the feedback period to feed back channel state information.

The terminal according to claim 11, wherein the time configuration module comprises:

The configuration submodule is configured to separately configure the three feedback types in the feedback report in which the PTI value is 0 or 1 in the feedback period.