Method for feeding back measurement results, user equipment and base station system
A technology for measurement results and user equipment, applied in transmission systems, digital transmission systems, error prevention/detection using return channels, etc., can solve problems such as excessive feedback of measurement results, to ensure communication quality and reduce feedback overhead Effect
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Embodiment 1
[0063] In this embodiment, each UE (user) always feeds back CSI (in the FDD system, feeds back CQI and PMI; in the TDD system, feeds back CQI) to the base station of the corresponding serving cell; for the UE to other non-primary serving cells ( That is, the CQI and PMI measurements of the coordinated cell), and the correlation threshold of a given CQI is α k And the feedback threshold of PMI is γ k . alpha k and gamma k is a predetermined value different for each base station.
[0064] For base stations other than serving cell base stations:
[0065] Report subframe t and t-t intv , if the absolute value of the SINR difference satisfies |SINR k (t)-SINR k (t-t intv )|≥α k , (where t intv Indicates the reporting subframe interval, which depends on the CQI reporting period configured by the upper layer), then feeds back the CQI measured for the coordinated cell to the base station of the serving cell, otherwise it does not feed back;
[0066] Report subframe t and t-...
Embodiment 2
[0069] The difference from Embodiment 1 is that for base stations other than the base station of the serving cell:
[0070] Report subframe t, if the absolute value of the SINR difference corresponding to the last reported subframe t0 satisfies |SINR k (t)-SINR k (t0)|≥α k , then feed back the CQI measured for the coordinated cell to the base station of the serving cell, otherwise no feedback;
[0071] Report subframe t, if the change of the channel matrix corresponding to the last reported subframe t0 satisfies f(H k (t), H k (t0))≥γ k , the PMI measured for the coordinated cell is fed back to the base station of the serving cell, otherwise no feedback is given.
[0072] In the second embodiment above, the threshold α for the change of the SINR measurement value is k It is set according to the absolute value of the signal-to-interference-noise ratio difference, and the threshold for the change of the channel state measurement value γ k It is set according to the distan...
Embodiment 3
[0074]The difference from Embodiments 1 and 2 is that for base stations other than the base station of the serving cell:
[0075] Subframe t is reported, and the distance from the last reported subframe t0 is greater than a preset feedback interval threshold t in units of subframes max , ie t-t0>t max , then feed back the CQI measured for the coordinated cell to the base station of the serving cell, otherwise no feedback;
[0076] Subframe t is reported, and the distance from the last reported subframe t0 is greater than a preset feedback interval threshold t in units of subframes max , ie t-t0>t max , the PMI measured for the coordinated cell is fed back to the base station of the serving cell, otherwise no feedback is given.
[0077] In the third embodiment above, both the CQI and the PMI are determined according to the feedback interval threshold whether to feed back and report.
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