System and method for uplink multiple input multiple output transmission

摘要

Methods and apparatuses are provided for uplink MIMO transmissions in a wireless communication system. In particular, a single inner loop power control may be utilized to control a power of both a primary stream and a secondary stream, in a system where the power of the secondary stream is linked to the power of the primary stream. That is, a single transmit power control command calculated according to the primary stream and directly controlling the power of the primary stream can effectively control the power of both uplink streams. Further, the disclosure provides outer loop power control, where a signal-to-interference ratio target used in the inner loop power control can be adjusted. Here, the SIR target may be adjusted in accordance with at least one of a block error rate performance or a HARQ failure performance of one of the primary stream or the secondary stream.

主权项

1. A method for controlling an uplink power, comprising:
receiving, utilizing an antenna array, a first stream of a multiple-input multiple-output (MIMO) uplink from a first user equipment, the first stream comprising a primary data channel and a primary pilot channel; receiving, utilizing the antenna array, a second stream of the MIMO uplink from the first user equipment, the second stream comprising a secondary data channel and a secondary pilot channel; controlling a power of the first stream and a power of the second stream of the MIMO uplink by utilizing a single inner loop power control, comprising:
determining a signal-to-interference ratio corresponding to the primary pilot channel; andgenerating a power control command in accordance with a comparison between the determined signal-to-interference ratio and a signal-to-interference ratio target, wherein the signal-to-interference ratio target is a variable controllable by an outer loop power control procedure,wherein the power control command comprises a traffic to pilot power ratio (T/P) configured to control the power of the first stream and the power of the second stream, such that a ratio between a power level of the primary data channel and a power level of the primary pilot channel is determined corresponds to the T/P, and a ratio between a power level of the secondary data channel and a power level of the secondary pilot channel is determined corresponds to the same T/P; andexecuting two hybrid automatic repeat request (HARQ) processes in a transmission time interval, including a first HARQ process for the first stream and a second HARQ process for the second stream.