Uplink power control for MU-MIMO

摘要

A method of power control for multi-user multi-input multi-output (MU-MIMO) transmissions between a pair of mobile terminals and a radio base station. The method comprises determining signal-to-interference-noise ratios (SINRs) for the radio channels between the mobile terminals and the radio base station, determining a channel orthogonality between the radio channels, and jointly determining, based on the SINRs and the channel orthogonality, power adjustment values for the mobile terminals. The present invention makes use of an understanding that the system gain resulting from MU-MIMO transmissions may be improved by optimizing the transmission power of the co-scheduled mobile terminals. For instance, the power adjustment values may be determined so as to attain certain SINR targets. Alternatively, the power adjustment values may be determined so as to maximize the throughput while maintaining a power budget constraint. Further, a radio base station for MU-MIMO transmissions is provided.

主权项

1. A method of power control for uplink multi-user multi-input multi-output (MU-MIMO) wireless transmissions between a pair of mobile terminals, the pair of mobile terminals comprising a first mobile terminal and a second mobile terminal, and a radio base station, the method comprising:
determining a first single-user signal-to-interference-noise ratio, SU-SINR, S1, for a first radio channel between the first mobile terminal and the radio base station, determining a second SU-SINR, S2, for a second radio channel between the second mobile terminal and the radio base station, determining a channel orthogonality, Δbetween the first radio channel and the second radio channel, and jointly determining, based on the first SU-SINR, the second SU-SINR, and the channel orthogonality, a first power adjustment value, α1, for the first mobile terminal and a second power adjustment value, α2, for the second mobile terminal, wherein the first power adjustment value and the second power adjustment value are determined based on a power budget constraint, K, while maximizing a transmission sum rate for the pair of mobile terminals.