Patent ID: 9722745
Date: 2017-08-01
CPC Classifications: H04B,H04L,H04W

Claim:
1. A method for coordinated multi point data transmission, comprising: a base station receiving a per-cell channel quality indicator (CQI) value reported by a user equipment (UE); looking up a signal to interference plus noise ratio (SINR)-CQI mapping table according to the per-cell CQI value, and acquiring a subband/broadband SINR value; performing CQI recalculation according to the subband/broadband SINR value, and acquiring a recalculated subband/broadband CQI value; and selecting modulation and coding according to the recalculated subband/broadband CQI value to schedule data transmission; wherein, the step of the base station performing CQI recalculation according to the subband/broadband SINR value, and acquiring a recalculated subband/broadband CQI value comprises: the base station performing uplink channel estimation through a sounding reference signal (SRS), acquiring SRS channel values of a serving cell and a coordinated cell; and calculating beamforming vectors of the serving cell and the coordinated cell through the SRS channel values; recalculating a joint transmission (JT) interference noise according to the SRS channel values and the subband/broadband SINR value; calculating an equivalent downlink channel value based on the SRS channel values and the beamforming vectors; recalculating the subband/broadband SINR value according to the equivalent downlink channel value and the recalculated JT interference noise; and looking up the SINR-CQI mapping table according to the recalculated subband/broadband SINR value, and acquiring the recalculated subband/broadband CQI value.