CN101820335B - A kind of method using secondary code words feeding back channel state information - Google Patents
A kind of method using secondary code words feeding back channel state information Download PDFInfo
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Abstract
The invention provides a kind of terminal and the method that use secondary code words feeding back channel state information, the method comprises, terminal cycle feedback channel quality instruction on row control channel physically, pre-coding matrix instruction (PMI) and order time, the described PMI of feedback comprises the PMI of one-level code book and the PMI of secondary code book.Adopt technical scheme of the present invention, adopt the PMI of secondary code book to carry out error quantization to the PMI of one-level code book, the precision of quantification can be improved, and substantially need not increase expense.
Description
Technical field
The present invention relates to mobile wide-band wire-less accessing system field, particularly relate to a kind of terminal and the method that use secondary code words feeding back channel state information.
Background technology
In recent years, forth generation mobile radio system (4thgeneration, LTE (longtermevolution 4G), Long Term Evolution plan) and international interoperability inserting of microwave system (Worldwideinteroperabilitymicrowaveaccess, Wimax) etc. obtain development at full speed.Multiple-input and multiple-output (MultipleInputMultipleOutput, MIMO) the milestone be applied in order to development of wireless communication systems, and making the throughput of mobile radio system, spectrum efficiency and system link performance obtain huge raising.When adopting MIMO technology, if be multiplied by a pre-coding matrix when transmitting data for the channel matrix right side, the performance of channel transmission data can be changed, to reach the object improving transmitted data rates.Usual pre-coding matrix feeds back to transmitting terminal with the index PMI of code word (PrecodingMatrixindicator, pre-coding matrix indicates) after receiving terminal code book quantizes.Quantize just to have quantization error, when the code word in code book is less, quantization error is just comparatively large, will bring the larger decline of data transmission performance, and when MU-MIMO (multi-user's multiple-input and multiple-output), this situation can be more serious.In the LTE standard of 3GPP, have employed the mode of one-level codebook quantification, just there is this problem.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of terminal and the method that use secondary code words feeding back channel state information, can feed back the PMI of one-level code book and the PMI of secondary code book simultaneously, improve the feedback accuracy of precoding.
The invention provides a kind of method using secondary code words feeding back channel state information, comprising:
Terminal physically row control channel (PUCCH) feedback channel quality of upper cycle instruction (CQI), pre-coding matrix instruction (PMI) and order time, the described PMI of feedback comprises the PMI of one-level code book and the PMI of secondary code book.
Further, if the cycle of described terminal feedback order is N0;
When order is 2, the following information of terminal periodic feedback in subband set: the PMI of the CQI of 2 streams of code words, the PMI of one-level code book and secondary code book, if feedback cycle is N1; Described N0 is the integral multiple of N1;
The CQI of 2 streams of code words of described feedback is the feedback to the PMI homography of one-level code book in subband set, and the PMI of described secondary code book is the feedback of the layer that in the PMI homography to one-level code book, CQI is larger.
Further, if the cycle of described terminal feedback order is N0;
When order is 2, the following information of terminal periodic feedback in subband set: the CQI of 2 streams of code words and the PMI of one-level code book, if feedback cycle is N1; The CQI of 2 streams of code words of described feedback is the feedback to the PMI homography of one-level code book in subband set, and described N0 is the integral multiple of N1;
The CQI of terminal also in subband set in the PMI of periodic feedback secondary code book and another matrix of drawing according to the PMI homography of described one-level code book and the PMI homography of secondary code book; If feedback cycle is N2; Described N1 is the integral multiple of N2;
The PMI of the secondary code book of described feedback is corresponding with the PMI of the one-level code book that the last time feeds back, and is the feedback of the layer that in the PMI homography to described one-level code book, CQI is larger.
Further, terminal is fed back the CQI of 2 streams of code words and is transmitted the subband identities of described CQI on subband; If the feedback cycle of terminal on subband is N2, described N1 is the integral multiple of N2;
The CQI of 2 streams of code words of described feedback is the feedback to the PMI homography of described one-level code book on subband.
Further, if the cycle of described terminal feedback order is N0;
When order is 2, the following information of terminal periodic feedback in subband set: the CQI of 2 streams of code words and the PMI of one-level code book, if feedback cycle is N1; Described N0 is the integral multiple of N1; The CQI of 2 streams of code words of described feedback is the feedback to the PMI homography of one-level code book in subband set;
Terminal is also fed back the CQI of 2 streams of code words and is transmitted the subband identities of described CQI on subband; If the feedback cycle of terminal in subband set is N1, the integral multiple of to be N2, N1 the be N2 of the feedback cycle on subband; The CQI of 2 streams of code words of described feedback is the feedback to the PMI homography of one-level code book on subband;
The CQI of terminal also on each subband in the PMI of periodic feedback secondary code book and another matrix of drawing according to the PMI homography of described one-level code book and the PMI homography of secondary code book, if feedback cycle is N2, described N1 is the integral multiple of N2;
The PMI of described secondary code book is the feedback of the layer that in the PMI homography to one-level code book, CQI is larger.
Further, if the cycle of described terminal feedback order is N0;
When order is 2, the following information of terminal periodic feedback in subband set: the CQI of 2 streams of code words and the PMI of one-level code book, if feedback cycle is N1; Described N0 is the integral multiple of N1; The CQI of 2 streams of code words of described feedback is the feedback to the PMI homography of one-level code book in subband set;
The PMI that described terminal also feeds back secondary code book on subband, the CQI of another matrix drawn according to the PMI of described one-level code book and the PMI of secondary code book and transmit the subband identities of above-mentioned information;
The PMI of described secondary code book is the feedback of the layer that in the PMI homography to one-level code book, CQI is larger;
If the feedback cycle of terminal in subband set is N1, the feedback cycle on subband is N2, and described N1 is the integral multiple of N2.
Further, if the cycle of described terminal feedback order is N0;
When order is 2, the following information of terminal periodic feedback in subband set: the CQI in the PMI of the CQI of 2 streams of code words, the PMI of one-level code book, secondary code book and another matrix of drawing according to the PMI homography of described one-level code book and the PMI homography of secondary code book, if feedback cycle is N1; Described N0 is the integral multiple of N1; The CQI of 2 streams of code words of described feedback is the feedback to the PMI homography of one-level code book in subband set;
Terminal also feeds back following information on subband: the CQI of 2 streams of code words, the CQI of another matrix drawn according to the PMI homography of described one-level code book and the PMI homography of secondary code book and transmit the subband identities of above-mentioned information, if the subband feedback cycle is N2; Described N1 is the integral multiple of N2; The CQI of 2 streams of code words of described feedback is the feedback to the PMI homography of one-level code book on subband;
The PMI of described secondary code book is the feedback of the layer that in the PMI homography to one-level code book, CQI is larger.
Further, the mode of the CQI of described feedback 2 streams of code words is, feeds back CQI or the CQI sequence number of wherein 1 streams of code words, and feeds back the difference of the CQI difference of described 2 streams of code words or the CQI sequence number of described 2 streams of code words.
Further, the mode of the CQI of another matrix that described feedback draws according to the PMI homography of described one-level code book and the PMI homography of secondary code book is:
The difference of larger CQI in CQI in feedback another matrix described and described 2 streams of code words.
The present invention also provides a kind of terminal using secondary code words feeding back channel state information,
Described terminal, for the instruction of row control channel (PUCCH) feedback channel quality of upper cycle physically (CQI), pre-coding matrix instruction (PMI) and order, the described PMI of feedback comprises the PMI of one-level code book and the PMI of secondary code book.
Further, if the cycle of described terminal feedback order is N0;
When order is 2, the following information of terminal periodic feedback in subband set: the PMI of the CQI of 2 streams of code words, the PMI of one-level code book and secondary code book, if feedback cycle is N1;
Described N0 is the integral multiple of N1;
The CQI of 2 streams of code words of described feedback is the feedback to the PMI homography of one-level code book in subband set, and the PMI of secondary code book is the feedback of the layer that in the PMI homography to described one-level code book, CQI is larger.
Further, if the cycle of described terminal feedback order is N0;
When order is 2, the following information of terminal periodic feedback in subband set: the CQI of 2 streams of code words and the PMI of one-level code book, if feedback cycle is N1; The CQI of 2 streams of code words of described feedback is the feedback to the PMI homography of one-level code book in subband set, and described N0 is the integral multiple of N1;
The CQI of described terminal also in subband set in the PMI of periodic feedback secondary code book and another matrix of drawing according to the PMI homography of one-level code book and the PMI homography of secondary code book; If feedback cycle is N2; Described N1 is the integral multiple of N2;
The PMI of the secondary code book of described feedback is corresponding with the PMI of the one-level code book that the last time feeds back, and is the feedback of the layer that in the PMI homography to described one-level code book, CQI is larger.
Further, terminal is also fed back the CQI of 2 streams of code words and is transmitted the subband identities of described CQI on subband; If the feedback cycle of terminal in subband set is N1, the feedback cycle on subband is N2, and described N1 is the integral multiple of N2;
The CQI of 2 streams of code words of described feedback is the feedback to the PMI homography of one-level code book on subband.
Further, if the cycle of described terminal feedback order is N0;
When order is 2, the following information of terminal periodic feedback in subband set: the CQI of 2 streams of code words and the PMI of one-level code book, if feedback cycle is N1; Described N0 is the integral multiple of N1; The CQI of 2 streams of code words of described feedback is the feedback to the PMI homography of one-level code book in subband set;
Terminal is also fed back the CQI of 2 streams of code words and is transmitted the subband identities of described CQI on subband; If the feedback cycle of terminal in subband set is N1, the integral multiple of to be N2, N1 the be N2 of the feedback cycle on subband; The CQI of 2 streams of code words of described feedback is the feedback to the PMI homography of one-level code book on subband;
The CQI of terminal also on each subband in the PMI of periodic feedback secondary code book and another matrix of drawing according to the PMI homography of one-level code book and the PMI homography of secondary code book, if feedback cycle is N2, described N1 is the integral multiple of N2;
The PMI of described secondary code book is the feedback of the layer that in the PMI homography to one-level code book, CQI is larger.
Further, if the cycle of described terminal feedback order is N0;
When order is 2, the following information of terminal periodic feedback in subband set: the CQI of 2 streams of code words and the PMI of one-level code book, if feedback cycle is N1; Described N0 is the integral multiple of N1; The CQI of 2 streams of code words of described feedback is the feedback to the PMI homography of one-level code book in subband set;
The PMI that described terminal also feeds back secondary code book on subband, the CQI of another matrix drawn according to the PMI of described one-level code book and the PMI of secondary code book and transmit the subband identities of above-mentioned information;
The PMI of described secondary code book is the feedback of the layer that in the PMI homography to one-level code book, CQI is larger;
If the feedback cycle of terminal in subband set is N1, the feedback cycle on subband is N2, and described N1 is the integral multiple of N2.
Further, if the cycle of described terminal feedback order is N0;
When order is 2, the following information of terminal periodic feedback in subband set: the CQI in the PMI of the CQI of 2 streams of code words, the PMI of one-level code book, secondary code book and another matrix of drawing according to the PMI homography of described one-level code book and the PMI homography of secondary code book, if feedback cycle is N1; Described N0 is the integral multiple of N1; The CQI of 2 streams of code words of described feedback is the feedback to the PMI homography of one-level code book in subband set;
Terminal also feeds back following information on subband: the CQI of 2 streams of code words, the CQI of another matrix drawn according to the PMI homography of described one-level code book and the PMI homography of secondary code book and transmit the subband identities of above-mentioned information, if the subband feedback cycle is N2; Described N1 is the integral multiple of N2; The CQI of 2 streams of code words of described feedback is the feedback to the PMI homography of one-level code book on subband;
The PMI of described secondary code book is the feedback of the layer that in the PMI homography to one-level code book, CQI is larger.
In sum, the invention provides a kind of terminal and the method that use secondary code words feeding back channel state information, adopt the PMI of secondary code book to carry out error quantization to the PMI of one-level code book, the precision of quantification can be improved, and substantially need not increase expense.
Embodiment
The invention provides a kind of terminal and the method that use secondary code words feeding back channel state information, in LTE, reporting of CQI, PMI and RI can periodic or acyclic report; UE regularly uses PUCCH (Physical Uplink Control Channel) to transmit CQI in the subframe not having PUSCH (Physical Uplink Shared Channel) to transmit, PMI and RI reports; In the subframe with the PUSCH be scheduled, UE uses PUSCH regularly to report CQI, PMI and RI, and wherein UE is by the CQI used with report based on PUCCH, the form that PMI and RI is identical; In identical subframe, when cycle and aperiodic report and occur simultaneously, UE only transmits and reports in that subframe aperiodic.
The present embodiment provides a kind of terminal using secondary code words feeding back channel state information, for periodic feedback CQI on PUCCH, PMI and RI, the PMI of feedback comprises the PMI (being designated as PMI_C1) of one-level code book and the PMI (being designated as PMI_C2) of secondary code book.
Particularly, terminal can in the following ways in any one feeding back channel state information:
(1) set the cycle of terminal feedback order as N0;
When order is 2, the following information of terminal periodic feedback in subband set: the PMI of the CQI of 2 streams of code words, the PMI of one-level code book and secondary code book, if feedback cycle is N1; N0 is the integral multiple of N1;
The CQI of 2 streams of code words of feedback is the feedback to the PMI homography of one-level code book in subband set, and the PMI of secondary code book is the feedback of the layer that in the PMI homography to one-level code book, CQI is larger.
(2) set the cycle of terminal feedback order as N0;
When order is 2, the following information of terminal periodic feedback in subband set: the CQI of 2 streams of code words and the PMI of one-level code book, if feedback cycle is N1; The CQI of 2 streams of code words of feedback is the feedback to the PMI homography of one-level code book in subband set, and N0 is the integral multiple of N1;
The CQI of terminal also in subband set in the PMI of periodic feedback secondary code book and another matrix of drawing according to the PMI homography of one-level code book and the PMI homography of secondary code book; If feedback cycle is N2; N1 is the integral multiple of N2;
The PMI of the secondary code book of feedback is corresponding with the PMI of the one-level code book that the last time feeds back, and is the feedback of the layer that in the PMI homography to one-level code book, CQI is larger.
(3) set the cycle of terminal feedback order as N0;
When order is 2, the following information of terminal periodic feedback in subband set: the PMI of the CQI of 2 streams of code words, the PMI of one-level code book and secondary code book, if feedback cycle is N1; N0 is the integral multiple of N1;
The CQI of 2 streams of code words of feedback is the feedback to the PMI homography of one-level code book in subband set, and the PMI of secondary code book is the feedback of the layer that in the PMI homography to one-level code book, CQI is larger.
Terminal also feeds back the CQI of 2 streams of code words and the subband identities of transmission CQI on subband; If the feedback cycle of terminal in subband set is N1, the integral multiple of to be N2, N1 the be N2 of the feedback cycle on subband; The CQI of 2 streams of code words of feedback is the feedback to the PMI homography of one-level code book on subband.
(4) set the cycle of terminal feedback order as N0;
When order is 2, the following information of terminal periodic feedback in subband set: the CQI of 2 streams of code words and the PMI of one-level code book, if feedback cycle is N1; N0 is the integral multiple of N1; The CQI of 2 streams of code words of feedback is the feedback to the PMI homography of one-level code book in subband set;
Terminal also feeds back the CQI of 2 streams of code words and the subband identities of transmission CQI on subband; If the feedback cycle of terminal in subband set is N1, the integral multiple of to be N2, N1 the be N2 of the feedback cycle on subband; The CQI of 2 streams of code words of feedback is the feedback to the PMI homography of one-level code book on subband;
The CQI of terminal also on each subband in the PMI of periodic feedback secondary code book and another matrix of drawing according to the PMI homography of one-level code book and the PMI homography of secondary code book, if feedback cycle is N2, N1 is the integral multiple of N2;
The PMI of secondary code book is the feedback of the layer that in the PMI homography to one-level code book, CQI is larger.
(5) set the cycle of terminal feedback order as N0;
When order is 2, the following information of terminal periodic feedback in subband set: the CQI of 2 streams of code words and the PMI of one-level code book, if feedback cycle is N1; N0 is the integral multiple of N1; The CQI of 2 streams of code words of feedback is the feedback to the PMI homography of one-level code book in subband set;
The PMI that terminal also feeds back secondary code book on subband, the CQI of another matrix drawn according to the PMI of one-level code book and the PMI of secondary code book and transmit the subband identities of above-mentioned information;
The PMI of secondary code book is the feedback of the layer that in the PMI homography to one-level code book, CQI is larger;
If the feedback cycle of terminal in subband set is N1, the integral multiple of to be N2, N1 the be N2 of the feedback cycle on subband.
(6) set the cycle of terminal feedback order as N0;
When order is 2, the following information of terminal periodic feedback in subband set: the CQI in the PMI of the CQI of 2 streams of code words, the PMI of one-level code book, secondary code book and another matrix of drawing according to the PMI homography of one-level code book and the PMI homography of secondary code book, if feedback cycle is N1; N0 is the integral multiple of N1; The CQI of 2 streams of code words of feedback is the feedback to the PMI homography of one-level code book in subband set;
Terminal also feeds back following information on subband: the CQI of 2 streams of code words, the CQI of another matrix drawn according to the PMI homography of one-level code book and the PMI homography of secondary code book and transmit the subband identities of above-mentioned information, if the subband feedback cycle is N2; N1 is the integral multiple of N2; The CQI of 2 streams of code words of feedback is the feedback to the PMI homography of one-level code book on subband;
The PMI of secondary code book is the feedback of the layer that in the PMI homography to one-level code book, CQI is larger.
Above in various mode, the mode of CQI of feedback 2 streams of code words can be, but not limited to into,
(a) feedback CQI (or CQI sequence number) of the 1st CW and the CQI (or CQI sequence number) of the 2nd CW;
B () feeds back the difference (or difference of CQI sequence number) of the wherein CQI (or CQI sequence number) of 1 CW and the CQI of 2 CW.
The mode feeding back the CQI of another matrix drawn according to the PMI homography of one-level code book and the PMI homography of secondary code book can be, but not limited to:
(A) CQI (or CQI sequence number) of another matrix drawn according to the PMI homography of one-level code book and the PMI homography of secondary code book is directly fed back;
(B) difference (or difference of CQI sequence number) of larger CQI in CQI and 2 streams of code words of another matrix described is fed back.
The present embodiment provides a kind of method using secondary code words feeding back channel state information, and terminal is on PUCCH when periodic feedback CQI, PMI and RI, and the PMI of feedback comprises the PMI of one-level code book and the PMI of secondary code book.
UE regularly uses the mode of PUCCH transmission CQI, PMI as follows:
Embodiment one
UE periodic feedback RI, if feedback cycle is N0, and only reports in the subframe of system specialization.As RI=2 (i.e. corresponding 2 CW), UE is at subband set S (i.e. wideband, broadband) the upper following information of periodic feedback: the CQI of 2 streams of code words, the PMI of one-level code book (can be described as again the PMI of code book 1, be designated as PMI_C1) and the PMI (can be described as again the PMI of code book 2, be designated as PMI_C2) of secondary code book; And the above-mentioned information of feedback only reports in the subframe of system specialization, if the cycle is N1, and N0 is the integral multiple of N1, i.e. N0=k1*N1 (k1 is positive integer);
The CQI of 2 streams of code words that can feed back in the following ways:
(a) feedback CQI (or CQI sequence number) of the 1st CW and the CQI (or CQI sequence number) of the 2nd CW;
B () feeds back the difference (or difference of CQI sequence number) of the wherein CQI (or CQI sequence number) of 1 CW and the CQI of 2 CW.
The PMI_C1 fed back is the index that the matrix of code book 1 is corresponding, and PMI_C2 is the index that the matrix of code book 2 is corresponding; The CQI of 2 streams of code words of feedback is the feedback of the matrix being PMI_C1 in subband set to pre-coding matrix index, and PMI_C2 is the feedback of the layer that in the matrix of PMI_C1, CQI is larger to index.
Embodiment two
UE periodic feedback RI, if feedback cycle is N0, and only reports in the subframe of system specialization.As RI=2, the following information of periodic feedback on UE subband set S: the CQI of 2 streams of code words and the PMI (can be described as again the PMI of code book 1, be designated as PMI_C1) of one-level code book, and only report in the subframe of system specialization, if feedback cycle is N1; N0 is the integral multiple of N1, i.e. N0=k1*N1 (k1 is positive integer);
The mode of the CQI of feedback 2 streams of code words can refer to the mode (a) described in embodiment one and (b);
The PMI_C1 fed back is the index that the matrix of code book 1 is corresponding, and the CQI of 2 streams of code words of feedback is the feedback of the matrix being PMI_C1 in subband set to pre-coding matrix index.
As RI=2, UE is the following information of periodic feedback on subband set S also: the PMI of secondary code book and the CQI of another matrix drawn according to the PMI homography of one-level code book and the PMI homography of secondary code book; And only in the subframe of system specialization, report above-mentioned information, if feedback cycle is N2, N1 is the integral multiple of N2, i.e. N1=k2*N2 (k1 is positive integer); PMI_C2 is the index that the matrix of code book 2 is corresponding; PMI_C2 is the feedback to the larger layer of CQI in the matrix represented by PMI_C1, and PMI_C2 is corresponding with the PMI_C1 that the last time feeds back.
The mode feeding back the CQI of another matrix drawn according to the PMI homography of one-level code book and the PMI homography of secondary code book can be, but not limited to:
(A) CQI (or CQI sequence number) of another matrix drawn according to the PMI homography of one-level code book and the PMI homography of secondary code book is directly fed back;
(B) difference (or difference of CQI sequence number) of larger CQI in CQI and 2 streams of code words of another matrix described is fed back.
The operation rule that matrix corresponding to PMI_C1 and PMI_C2 obtains another matrix can be arranged as required, and the present invention is not restricted this.
Embodiment three
UE periodic feedback RI, if feedback cycle is N0, and only reports in the subframe of system specialization.As RI=2, the following information of UE periodic feedback on subband set S: the PMI of the CQI of 2 streams of code words, the PMI of one-level code book and secondary code book, and only report in the subframe of system specialization, if the cycle is N1, and N0 is the integral multiple of N1, i.e. N0=k1*N1 (k1 is positive integer);
The mode of the CQI of feedback 2 streams of code words can refer to the mode (a) described in embodiment one and (b); PMI_C2 is the index that the matrix of code book 2 is corresponding; The CQI of 2 streams of code words of feedback is the feedback of the matrix being PMI_C1 to pre-coding matrix index in subband set, and PMI_C2 is the feedback of the layer that in the matrix of PMI_C1, CQI is larger to index.
As RI=2, UE is the CQI of periodic feedback 2 streams of code words and the subband identities (this subband identities L represents) of transmission CQI also, this mark instruction position of subband in BP, and only report in the subframe of system specialization, if the cycle is N2, and N1 is the integral multiple of N2, i.e. N1=k2*N2 (k2 is positive integer);
The CQI of 2 streams of code words of feedback is the feedback of the matrix being PMI_C1 on subband to pre-coding matrix index.
Embodiment four
UE periodic feedback RI, if feedback cycle is N0, and only reports in the subframe of system specialization.As RI=2, the following information of UE periodic feedback on subband set S: the CQI of 2 streams of code words and the PMI (can be described as again the PMI of code book 1, be designated as PMI_C1) of one-level code book, and only report in the subframe of system specialization, if feedback cycle is N1; N0 is the integral multiple of N1, i.e. N0=k1*N1 (k1 is positive integer);
The PMI_C1 fed back is the index that the matrix of code book 1 is corresponding, and the CQI of 2 streams of code words of feedback is the feedback of the matrix being PMI_C1 to pre-coding matrix index in subband set.
As RI=2, UE also feeds back the CQI of 2 streams of code words and the subband identities (this subband identities L represents) of transmission CQI on subband, this mark instruction position of subband in BP, and only report in the subframe of system specialization, if feedback cycle is N2, N1 is the integral multiple of N2, i.e. N1=k2*N2 (k2 is positive integer); The CQI of 2 streams of code words of feedback is the feedback of the matrix being PMI_C1 on subband to pre-coding matrix index.
As RI=2, the CQI of UE also on each subband in the PMI (being designated as PMI_C2) of periodic feedback secondary code book and another matrix of drawing according to PMI_C1 homography and PMI_C2 homography, and only report in the subframe of system specialization, if feedback cycle is N2, N1 is the integral multiple of N2, i.e. N1=k2*N2 (k2 is positive integer); PMI_C2 is the feedback of the layer that in the matrix of PMI_C1, CQI is larger to index;
The mode of the CQI of above-mentioned feedback 2 streams of code words can refer to the mode (a) described in embodiment one and any one in (b);
The mode feeding back the CQI in another matrix drawn according to PMI_C1 homography and PMI_C2 homography can be, but not limited to:
(A) CQI (or CQI sequence number) of another matrix drawn according to the PMI homography of one-level code book and the PMI homography of secondary code book is directly fed back;
(B) difference (or difference of CQI sequence number) of larger CQI in CQI and 2 streams of code words in feedback another matrix described.
Embodiment five
UE periodic feedback RI, if feedback cycle is N0, and only reports in the subframe of system specialization.As RI=2, the following information of periodic feedback on UE subband set S: the CQI of 2 streams of code words and the PMI (being designated as PMI_C1) of one-level code book, and only report in the subframe of system specialization, if the cycle is N1, and N0 is the integral multiple of N1, i.e. N0=k1*N1 (k1 is positive integer);
The CQI of 2 streams of code words of feedback is in the feedback of subband set to PMI_C1 homography;
As RI=2, CQI in the PMI (being designated as PMI_C2) that UE also subband feeds back secondary code book, another matrix of drawing according to PMI_C1 homography and PMI_C2 homography and transmit the subband identities (this subband identities L represents) of above-mentioned information, this mark instruction position of subband in BP, and only report in the subframe of system specialization, if the cycle is N2, and N1 is the integral multiple of N2, i.e. N1=k2*N2 (k2 is positive integer);
PMI_C2 is the feedback of the layer that in the matrix of PMI_C1, CQI is larger to index; Another matrix that matrix obtains corresponding to PMI_C1 and PMI_C2 to be RI be 1 matrix.
The mode of the CQI of above-mentioned feedback 2 streams of code words can refer to the mode (a) described in embodiment one and any one in (b);
The mode feeding back the CQI in another matrix drawn according to PMI_C1 homography and PMI_C2 homography can be, but not limited to:
(A) CQI (or CQI sequence number) of another matrix drawn according to the PMI homography of one-level code book and the PMI homography of secondary code book is directly fed back;
(B) difference (or difference of CQI sequence number) of larger CQI in CQI and 2 streams of code words in feedback another matrix described.
Embodiment six
UE periodic feedback RI, if feedback cycle is N0, and only reports in the subframe of system specialization.As RI=2, the following information of periodic feedback on UE subband set S: the CQI in the PMI (being designated as PMI_C2) of the CQI of 2 streams of code words, the PMI (being designated as PMI_C1) of one-level code book, secondary code book and another matrix of drawing according to PMI_C1 homography and PMI_C2 homography, and only report in the subframe of system specialization, if feedback cycle is N1, and N0 is the integral multiple of N1, i.e. N0=k1*N1 (k1 is positive integer);
PMI_C1 is the index that in code book 1, matrix is corresponding, and PMI_C2 is the index that in code book 2, matrix is corresponding; The CQI of 2 streams of code words of feedback is the feedback of the matrix being PMI_C1 to pre-coding matrix index in subband set, and PMI_C2 is the feedback of the layer that in the matrix of PMI_C1, CQI is larger to index.
As RI=2, UE also periodic feedback 2 streams of code words CQI, the CQI of another matrix drawn according to PMI_C1 and PMI_C2 homography and transmit the subband identities (this subband identities L represents) of above-mentioned information, this mark instruction position of subband in BP, and only report in the subframe of system specialization, if the cycle is N2, and N1 is the integral multiple of N2, i.e. N1=k2*N2 (k2 is positive integer);
The CQI of 2 streams of code words of feedback is the feedback of the matrix being PMI_C1 to pre-coding matrix index.
The mode of the CQI of above-mentioned feedback 2 streams of code words can refer to the mode (a) described in embodiment one and any one in (b);
The mode feeding back the CQI in another matrix drawn according to PMI_C1 homography and PMI_C2 homography can be, but not limited to:
(A) CQI (or CQI sequence number) of another matrix drawn according to the PMI homography of one-level code book and the PMI homography of secondary code book is directly fed back;
(B) difference (or difference of CQI sequence number) of larger CQI in CQI and 2 streams of code words in feedback another matrix described.
The foregoing is only embodiments of the invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within right of the present invention.
Claims (9)
1. use a method for secondary code words feeding back channel state information, comprising:
Terminal physically row control channel (PUCCH) feedback channel quality of upper cycle instruction (CQI), pre-coding matrix instruction (PMI) and order time, the described PMI of feedback comprises the PMI of one-level code book and the PMI of secondary code book;
When order is 2, the PMI of described secondary code book is the feedback of the layer that in the PMI homography to one-level code book, CQI is larger.
2. the method for claim 1, is characterized in that, described method specifically refers to:
If the cycle of described terminal feedback order is N0;
When order is 2, the following information of terminal periodic feedback in subband set: the PMI of the CQI of 2 streams of code words, the PMI of one-level code book and secondary code book, if feedback cycle is N1; Described N0 is the integral multiple of N1;
The CQI of 2 streams of code words of described feedback is the feedback to the PMI homography of one-level code book in subband set.
3. the method for claim 1, is characterized in that, described method specifically refers to:
If the cycle of described terminal feedback order is N0;
When order is 2, the following information of terminal periodic feedback in subband set: the CQI of 2 streams of code words and the PMI of one-level code book, if feedback cycle is N1; The CQI of 2 streams of code words of described feedback is the feedback to the PMI homography of one-level code book in subband set, and described N0 is the integral multiple of N1;
The CQI of terminal also in subband set in the PMI of periodic feedback secondary code book and another matrix of drawing according to the PMI homography of described one-level code book and the PMI homography of secondary code book; If feedback cycle is N2; Described N1 is the integral multiple of N2;
The PMI of the secondary code book of described feedback is corresponding with the PMI of the one-level code book that the last time feeds back.
4. method as claimed in claim 2, it is characterized in that, described method also comprises:
Terminal is fed back the CQI of 2 streams of code words and is transmitted the subband identities of described CQI on subband; If the feedback cycle of terminal on subband is N2, described N1 is the integral multiple of N2;
The CQI of 2 streams of code words of described feedback is the feedback to the PMI homography of described one-level code book on subband.
5. the method for claim 1, is characterized in that, described method specifically refers to:
If the cycle of described terminal feedback order is N0;
When order is 2, the following information of terminal periodic feedback in subband set: the CQI of 2 streams of code words and the PMI of one-level code book, if feedback cycle is N1; Described N0 is the integral multiple of N1; The CQI of 2 streams of code words of described feedback is the feedback to the PMI homography of one-level code book in subband set;
Terminal is also fed back the CQI of 2 streams of code words and is transmitted the subband identities of described CQI on subband; If the feedback cycle of terminal in subband set is N1, the integral multiple of to be N2, N1 the be N2 of the feedback cycle on subband; The CQI of 2 streams of code words of described feedback is the feedback to the PMI homography of one-level code book on subband;
The CQI of terminal also on each subband in the PMI of periodic feedback secondary code book and another matrix of drawing according to the PMI homography of described one-level code book and the PMI homography of secondary code book, if feedback cycle is N2, described N1 is the integral multiple of N2.
6. the method for claim 1, is characterized in that, described method specifically refers to:
If the cycle of described terminal feedback order is N0;
When order is 2, the following information of terminal periodic feedback in subband set: the CQI of 2 streams of code words and the PMI of one-level code book, if feedback cycle is N1; Described N0 is the integral multiple of N1; The CQI of 2 streams of code words of described feedback is the feedback to the PMI homography of one-level code book in subband set;
The PMI that described terminal also feeds back secondary code book on subband, the CQI of another matrix drawn according to the PMI of described one-level code book and the PMI of secondary code book and transmit the subband identities of above-mentioned information;
If the feedback cycle of terminal in subband set is N1, the feedback cycle on subband is N2, and described N1 is the integral multiple of N2.
7. the method for claim 1, is characterized in that, described method specifically refers to:
If the cycle of described terminal feedback order is N0;
When order is 2, the following information of terminal periodic feedback in subband set: the CQI in the PMI of the CQI of 2 streams of code words, the PMI of one-level code book, secondary code book and another matrix of drawing according to the PMI homography of described one-level code book and the PMI homography of secondary code book, if feedback cycle is N1; Described N0 is the integral multiple of N1; The CQI of 2 streams of code words of described feedback is the feedback to the PMI homography of one-level code book in subband set;
Terminal also feeds back following information on subband: the CQI of 2 streams of code words, the CQI of another matrix drawn according to the PMI homography of described one-level code book and the PMI homography of secondary code book and transmit the subband identities of above-mentioned information, if the subband feedback cycle is N2; Described N1 is the integral multiple of N2; The CQI of 2 streams of code words of described feedback is the feedback to the PMI homography of one-level code book on subband.
8. the method as described in claim as arbitrary in claim 2 to 7, is characterized in that:
The mode of the CQI of described feedback 2 streams of code words is, feeds back CQI or the CQI sequence number of wherein 1 streams of code words, and feeds back the difference of the CQI difference of described 2 streams of code words or the CQI sequence number of described 2 streams of code words.
9. the method as described in the arbitrary claim of claim 3,5,6 or 7, is characterized in that:
The mode of the CQI of another matrix that described feedback draws according to the PMI homography of described one-level code book and the PMI homography of secondary code book is:
The difference of larger CQI in CQI in feedback another matrix described and described 2 streams of code words.
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| JP5881678B2 (en) * | 2010-04-12 | 2016-03-09 | エルジー エレクトロニクス インコーポレイティド | Efficient feedback method and apparatus in multi-antenna assisted wireless communication system |
| CN101958773B (en) * | 2010-09-30 | 2016-08-24 | 中兴通讯股份有限公司 | The method of feedback channel information and terminal |
| US8687727B2 (en) * | 2010-11-05 | 2014-04-01 | Intel Corporation | Coordinated multi-point transmission using interference feedback |
| CN102013956B (en) * | 2010-11-25 | 2015-09-16 | 中兴通讯股份有限公司 | A kind of channel state information feedback method and device |
| CN102025450B (en) * | 2010-11-29 | 2015-06-03 | 中兴通讯股份有限公司 | Method for feeding back channel information coding and mobile terminal |
| EP2709288B1 (en) | 2011-06-03 | 2017-04-05 | Huawei Technologies Co., Ltd. | Method, device and system for transmitting channel state information |
| CN104782071B (en) * | 2013-10-18 | 2018-10-09 | 华为技术有限公司 | The measurement and feedback method of channel state information, terminal and base station |
| CN106209195B (en) | 2015-03-06 | 2020-02-11 | 电信科学技术研究院 | Channel state information acquisition method, channel state information feedback method and device |
| WO2016141778A1 (en) * | 2015-03-06 | 2016-09-15 | 电信科学技术研究院 | Channel state information acquisition method, and channel state information feedback method and apparatus |
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