Open loop channel reporting in a wireless communication system

摘要

Techniques for reporting channel quality indicator (CQI) in a wireless communication system are described. In one design, a UE determines CQI based on an assumption of a set of precoding matrices being used by a base station for data transmission to the UE. The base station may or may not actually use the set of precoding matrices assumed by the UE. The UE sends the CQI to the base station and thereafter receives data transmission sent by the base station based on the CQI. In one design, the UE determines the set of precoding matrices for a set of time-frequency resources available for data transmission to the UE. The UE determines the received signal quality of each time-frequency resource based on a precoding matrix for that time-frequency resource. The UE then determines the CQI based on the received signal qualities of the set of time-frequency resources.

主权项

1. A method for wireless communication, comprising:
determining, at a user equipment (UE), a channel quality indicator (CQI) using a set of precoding matrices that is assumed by the UE, the set of precoding matrices assumed by the UE being for a set of time-frequency resources available for data transmission to the UE and the UE selecting random precoding matrices for the set of time-frequency resources, the UE assuming the set of precoding matrices for the set of time-frequency resources based on a base station randomly or pseudo-randomly selecting a set of precoding matrices for the data transmission to the UE, wherein the set of precoding matrices assumed by the UE is different from the set of precoding matrices randomly or pseudo-randomly selected by the base station for the data transmission to the UE; and sending the CQI from the UE to the base station.