System and method for direct mobile communications power control

摘要

A method for transmitting to a direct mobile communications (DMC) device by a user equipment operating in both a cellular mode and a DMC mode includes estimating a first pathloss of a first channel from the user equipment to a base station according to a difference between a known base station transmit power level and a received base station power level, and estimating a second pathloss of a second channel from the user equipment to the DMC device according to a difference between a known DMC device transmit power level and a received DMC device power level. The method also includes setting a transmit power level for transmission to the DMC device according to the first pathloss and the second pathloss, and transmitting a signal to the DMC device at the transmit power level.

主权项

1. A method for operating a direct mobile communications (DMC) device, the method comprising:
receiving an instruction to transmit a channel measurement signal to a transmitting DMC device at a specified network resource; transmitting the channel measurement signal to the transmitting DMC device at the specified network resource; and receiving a signal from the transmitting DMC device, wherein the transmit power level of the signal from the transmitting DMC device is determined by: estimating a first pathloss of a first channel from the transmitting DMC device to a base station according to a difference between a known base station transmit power level and a received base station power level; estimating a second pathloss of a second channel from the DMC device to the transmitting DMC device according to a difference between a known DMC device transmit power level and a received DMC device power level, based on the channel measurement signal; and setting a transmit power level for the signal from the transmitting DMC device according to the first pathloss and the second pathloss such that the transmit power level results in an interference level with transmission to the base station less than or equal to a maximum interference level and such that the transmit power level is greater than or equal to a minimum power level, wherein the minimum power level is determined by a minimum receiving power of the DMC, the second pathloss, a bandwidth of the second channel and a modulation and coding scheme of the transmission to the DMC device.