MIMO WIRELESS COMMUNICATION SYSTEM

摘要

In a LTE-based wireless communication system, a first user (UEB) in a first cell (Cell A) may experience significant interference from downlink transmissions in a second cell (Cell B). Interference can be reduced by selecting a precoder for downlink transmission to a second user (UEA) in the first cell which will result in reduced interference to the first user (UEB) after the first user (UEB) is handed-over to the second cell. The uplink/downlink channel reciprocity in TDD systems and the new transmission mode TM9 in LTE Release 10 are exploited to obtain channel information and determine precoding. After handover to the second cell, a resource allocation (RBB) to the first user (UEB) is notified to the first cell. In the first cell, the second user (UEA) receives the same resource allocation and a precoder selected to reduce interference to the first user.

主权项

1. A time-division duplex wireless communication method in which a first base station uses multiple antenna ports in multiple-input multiple-output communication with terminals in a first cell, the multiple-input multiple-output communications to the terminals being performed with application of a respective precoder, the method comprising, in the first base station:
determining information about a multiple-input multiple-output channel between the first base station and a first terminal; transmitting data to the first terminal via the channel; detecting that the first terminal is subject to interference from a second cell; storing information about the channel and handing over the first terminal to the second cell; obtaining information on a resource allocation to the first terminal in the second cell; finding an interference-reducing precoder on a basis of the information about the channel; selecting a second terminal in the first cell with which to precode communications by the interference-reducing precoder; and performing wireless communications with the second terminal with application of the interference-reducing precoder and using another resource allocation in the first cell which includes said resource allocation to the first terminal in the second cell.