Abstract
The multi-BS MIMO or network MIMO techniques are used for improving sector throughput and cell-edge throughput through multi-cell collaborative precoding, network coordinated beamforming, or inter-cell interference nulling. When a mobile station is at the cell edge, it may be able to receive signals from multiple cell sites, and the mobile station’s transmission may also be received at multiple cell sites. If the data transmission and signaling from multiple cell sites can be coordinated, the downlink performance can be significantly improved. This coordination can be similar to the interference avoidance techniques or the case where the same data is transmitted from multiple cell sites. In the uplink, since the signal can be received by multiple cell sites, the system can take advantage of coordinated multi-point reception to significantly improve the link performance. The coordinated multi-point transmission/reception specified in LTE Rel-11 is a method of MIMO transmission for interference reduction which enables features such as network synchronization, cell- and user-specific reference signals, feedback of multi-cell channel state information, and synchronous data transfer between the base stations that can be used for interference mitigation and to achieve macro-diversity gain.
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