Patent ID: 9680542
Date: 2017-06-13
CPC Classifications: H04B,H04L

Claim:
1. A method for performing precoding in a wireless communication system, the method comprising: obtaining a parameter indicative of reception quality on a downlink channel from a base station to a user equipment (UE) served by the base station; comparing the parameter with a predetermined reception quality threshold; and based on the comparison result, selecting a precoding mechanism for use in communicating with the UE; wherein a frequency band over which wireless communications are carried out in the wireless communication system comprises a plurality of sub-bands and a precoding matrix for the UE for one of the sub-bands is determined based on uplink measurement over the one of the sub-bands, and wherein the precoding mechanism is selected from a first precoding mechanism where a precoding matrix for the UE for each of the other sub-bands is determined as the precoding matrix for the one of the sub-bands and a second precoding mechanism where a precoding matrix for the UE for each of the other sub-bands is determined as the precoding matrix for the one of the sub-bands adjusted by a predefined diversity matrix for said each of the other sub-bands.