Method and device for feeding back downlink channel feedback information, and method and device for user pairing

Abstract

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.