METHOD AND DEVICE FOR FEEDING BACK DOWNLINK CHANNEL FEEDBACK INFORMATION, AND METHOD AND DEVICE FOR USER PAIRING
A method and device for feeding back downlink channel feedback information, and a method and device for user pairing. The method for feeding back downlink channel feedback information includes: calculating the multi-user channel quality indication error of a user, which error is used to reflect the difference in channel quality indication between the situation of multi-user multiple input multiple output transmission and the situation of single user multiple input multiple output transmission; adding the multi-user channel quality indication error into the downlink channel feedback information which includes a pre-coding matrix indication and a channel quality indication, and feeding the same back to a base station for scheduling. Therefore, the bit error rate of demodulation in the MIMO system can be reduced and the system performance can be improved.
1 . An electronic device in a wireless communication system, comprising:
processing circuity configured to
measure a signal quality of a reference signal transmitted by a base station;
generate a channel quality indication (CQI) and a pre-coding matrix indication (PMI) based on the signal quality;
determine, based on the CQI, a difference of downlink channel quality between a sub-band transmission and a wideband transmission; and
report, to the base station, a channel state information, wherein the channel state information includes the CQI and the PMI and indicates the difference of the downlink channel quality between the sub-band transmission and the wideband transmission.
2 . The electronic device according to claim 1 , wherein the signal quality is a signal to noise ratio (SNR) and/or a reference signal received power (RSRP).
3 . The electronic device according to claim 1 , wherein
the reference signal comprises a wideband reference signal and a sub-band reference signal, and
the difference of the downlink channel quality is a difference of a function value of a sub-band CQI corresponding to the sub-band reference signal and a function value of a wideband CQI corresponding to the wideband reference signal.
4 . The electronic device according to claim 1 , wherein
the sub-band transmission is a single user Multiple Input Multiple Output (MIMO) transmission and the wideband transmission is a multi-user MIMO transmission.
5 . The electronic device according to claim 1 , wherein the electronic device is user equipment and further comprises multiple antennas configured to transmit the channel state information to the base station via a radio interface.
6 . The electronic device according to claim 1 , wherein
the wireless communication system is a Multiple Input Multiple Output (MIMO) communication system.
7 . A method for an electronic device in a wireless communication system, comprising:
measuring a signal quality of a reference signal transmitted by a base station;
generating a channel quality indication (CQI) and a pre-coding matrix indication (PMI) based on the signal quality;
determining, using processing circuitry, based on the CQI, a difference of downlink channel quality between a sub-band transmission and a wideband transmission;
reporting, to the base station, a channel state information, wherein the channel state information includes the CQI and the PMI and indicates the difference of the downlink channel quality between the sub-band transmission and the wideband transmission.
8 . The method according to claim 7 , wherein the signal quality is a signal to noise ratio (SNR) and/or a reference signal received power (RSRP).
9 . The method according to claim 7 , wherein
the reference signal comprises a wideband reference signal and a sub-band reference signal, and
the difference of the downlink channel quality is a difference of a function value of a sub-band CQI corresponding to the sub-band reference signal and a function value of a wideband CQI corresponding to the wideband reference signal.
10 . The method according to claim 7 , wherein
the sub-band transmission is a single user Multiple Input Multiple Output (MIMO) transmission and the wideband transmission is a multi-user MIMO transmission.
11 . The method according to claim 7 , wherein the electronic device is user equipment and further comprises multiple antennas configured to transmit the channel state information to the base station via a radio interface.
12 . The method according to claim 7 , wherein
the wireless communication system is a Multiple Input Multiple Output (MIMO) communication system.
13 . A non-transitory computer readable medium including executable instructions, which when executed by a computer cause the computer to execute a method for an electronic device in a wireless communication system, the method comprising:
measuring a signal quality of a reference signal transmitted by a base station;
generating a channel quality indication (CQI) and a pre-coding matrix indication (PMI) based on the signal quality;
determining, based on the CQI, a difference of downlink channel quality between a sub-band transmission and a wideband transmission;
reporting, to the base station, a channel state information, wherein the channel state information includes the CQI and the PMI and indicates the difference of the downlink channel quality between the sub-band transmission and the wideband transmission.
14 . The non-transitory computer readable medium according to claim 13 , wherein the signal quality is a signal to noise ratio (SNR) and/or a reference signal received power (RSRP).
15 . The non-transitory computer readable medium according to claim 13 , wherein
the reference signal comprises a wideband reference signal and a sub-band reference signal, and
the difference of the downlink channel quality is a difference of a function value of a sub-band CQI corresponding to the sub-band reference signal and a function value of a wideband CQI corresponding to the wideband reference signal.
16 . The non-transitory computer readable medium according to claim 13 , wherein the sub-band transmission is a single user Multiple Input Multiple Output (MIMO) transmission and the wideband transmission is a multi-user MIMO transmission.
17 . The non-transitory computer readable medium according to claim 13 , wherein the electronic device is user equipment and further comprises multiple antennas configured to transmit the channel state information to the base station via a radio interface.
18 . The non-transitory computer readable medium according to claim 13 , wherein
the wireless communication system is a Multiple Input Multiple Output (MIMO) communication system.