Feedback method and device of non-periodic channel state information as well as mobile terminal
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A channel state information, feedback device technology, applied in the directions of space transmit diversity, diversity/multi-antenna systems, etc., to achieve the effect of enhanced feedback
Active Publication Date: 2013-09-18
CHINA MOBILE COMM GRP CO LTD
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[0011] Embodiments of the present invention provide an aperiodic channel state information (CSI) feedback method, device, and mobile terminal to solve the problem of feedback load brought by enhanced CSI feedback in MU-MIMO technology and CS / CB technology
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example 1
[0058] The base station antenna is 4 antennas, dual-polarized antennas. The codeword consists of row 1, row 2, row 5 and row 6 of the 8-antenna codeword.
[0059] The UE is configured in non-carrier aggregation mode. When the UE receives the CQI request sent by the base station, if the bit of the CQI request is "1", it indicates that CQI and PMI need to be fed back;
[0060] If RI=1, UE feeds back CQI and PMI (including traditional CQI, additional CQI and traditional PMI) according to Table 4 below:
[0061] Table 4
[0062] Wideband CQI codeword 0
4
Wideband extra CQI codeword 0
3
Broadband PMI1
4
Subband PMI2
4N
[0063] If RI>1, UE feeds back CQI and PMI (including traditional CQI, traditional PMI and additional CQI) according to Table 5 below:
[0064] table 5
[0065] feedback subfield
example 2
[0067] The base station antenna is 4 antennas, dual-polarized antennas. The codeword consists of row 1, row 2, row 5 and row 6 of the 8-antenna codeword.
[0068] The UE is configured in the carrier aggregation mode, and the carrier components include CC0, CC1, CC2 and CC3. When the UE receives the CQI request sent by the base station on the carrier component CC0, it finds that the bit of the CQI request is "01", indicating that it needs to feed back CQI / PMI;
[0069] The UE feeds back the traditional CQI and traditional PMI on the carrier component CC0 according to the above table 1;
[0070] The UE feeds back additional CQI and additional PMI on the carrier component CC1 according to the following table 6:
[0071] Table 6
[0072] feedback subfield
RI=1
RI=2
RI=3
RI=4
Wideband extra CQI codeword 0
4
4
4
4
Wideband extra CQI codeword 1
0
4
4
4
Broadband Extra PMI1
4
4
2
2
...
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Abstract
The embodiment of the invention provides a feedback method and device of non-periodic CSI (Channel State Information) as well as a mobile terminal. When UE (User Equipment) receives a request for feeding back a CQI (Channel Quality Indicator) request of CSI, traditional PMI (Precoding Matrix Indicator) and a traditional CQI are fed back, and extra CSI needing to be fed back is determined according to a carrier resource confirmation manner of the UE and a usable feedback resource; and the usable feedback resource is used for feeding back the extra CSI, wherein the usable feedback resource is a feedback resource increased on the basis of a traditional broadband feedback mode 1-2 or an idle feedback resource in the traditional broadband feedback mode 1-2. According to the feedback method, device and system of the non-periodic CSI disclosed by the embodiment of the invention, on the basis of the prior art, the feedback of the enhanced CSI is realized under the condition of not increasing the feedback resource or limitedly increasing the feedback resource; and the realization of MU-MIMO (Multiple User-Multiple Input Multiple Output) and CS/CB (Coordinated Scheduling/Beamforming) schemes is effectively supported.
Description
technical field [0001] The present invention relates to the technical field of mobile communication, in particular to a feedback method, device and mobile terminal of aperiodic channel state information (CSI). Background technique [0002] The enhancement of downlink multi-antenna (MultipleInputMultipleOutput, MIMO) transmission and the enhancement of corresponding channel state information (ChannelStateInformation, CSI) feedback is an important standardization point of the current 3GPPL TERel.11 specification. In the existing technical specification, three indication information are defined The downlink CSI report includes channel quality indicator (ChannelQualityIndicator, CQI), precoding matrix indicator (PrecodingMatrixIndicator, PMI) and channel rank indicator (RankIndex, RI). In an 8-antenna system, the PMI consists of two levels of feedback, PMI1 and PMI2. At the same time, the existing specifications define two types of feedback modes, periodic and aperiodic, for th...
Claims
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