Method and apparatus for supporting distributed MIMO in a wireless communication system

摘要

Techniques for supporting distributed MIMO are described. For multi-user distributed MIMO, a cell directs its transmit power toward a UE while reducing interference to UE(s) in neighbor cell(s). For single-user distributed MIMO, multiple cells concurrently send transmissions to a UE. In an aspect, a UE sends channel estimates for serving and non-serving cells to support multi-user distributed MIMO. Each cell may use the channel estimates to select UEs for data transmission and determine precoding vectors to use for data transmission to the selected UEs. In another aspect, a UE sends CQI information for serving and non-serving cells to support single-user distributed MIMO. Each cell may use the CQI information to select UEs for data transmission and determine modulation and coding schemes to use for the selected UEs. In yet another aspect, a UE determines CQI information for a serving cell by taking into account interference nulling by non-serving cells.

主权项

1. A method for wireless communication, comprising:
determining a first channel estimate for a first cell at a user equipment (UE); determining a second channel estimate for a second cell at the UE; determining channel quality indicator (CQI) information for the first cell; quantizing the first channel estimate with a first number of bits; quantizing the second channel estimate with a second number of bits greater than the first number of bits; sending the first and second channel estimates from the UE to at least one of the first and second cells; sending the CQI information to the first cell; receiving a first transmission sent by the first cell based on the first channel estimate and the CQI information; and receiving a second transmission sent by the second cell based on the second channel estimate, wherein the first and second transmissions are received on same resources.