A method for operating a direct mobile communications, DMC, device (220, 410), the method comprising: receiving an instruction to transmit a channel measurement signal to a transmitting DMC device (215, 405) at a specified network resource; transmitting the channel measurement signal to the transmitting DMC device (215, 405) at the specified network resource; and receiving a signal from the transmitting DMC device (215, 405) at the DMC device (220, 410), wherein the transmit power level of the signal from the transmitting DMC device (215, 405) is determined by: estimating a first pathloss, PL BS, of a first channel from the transmitting DMC device (215, 405) to a base station (205, 420) according to a difference between a known base station transmit power level and a received base station power level; estimating a second pathloss, PL D, of a second channel from the transmitting DMC device (215, 405) to the DMC device (220, 410) according to a difference between a known DMC device transmit power level and a received DMC device power level; and setting a transmit power level for transmission to the DMC device (220, 410) according to the first pathloss, PL BS, and the second pathloss, PL D, wherein setting the transmit power level comprises selecting a minimum one of a transmit power level among a minimum transmit power level, P D, resulting in a successful detection and decoding at the DMC device (220, 410), a maximum transmit power level, P iBS, resulting in a maximum interference level, P i, at the base station (205, 420) and a maximum transmit power level, P MAX, of the transmitting DMC device (215, 405). receiving an instruction to transmit a channel measurement signal to a transmitting DMC device (215, 405) at a specified network resource; transmitting the channel measurement signal to the transmitting DMC device (215, 405) at the specified network resource; and receiving a signal from the transmitting DMC device (215, 405) at the DMC device (220, 410), wherein the transmit power level of the signal from the transmitting DMC device (215, 405) is determined by: estimating a first pathloss, PL BS, of a first channel from the transmitting DMC device (215, 405) to a base station (205, 420) according to a difference between a known base station transmit power level and a received base station power level; estimating a second pathloss, PL D, of a second channel from the transmitting DMC device (215, 405) to the DMC device (220, 410) according to a difference between a known DMC device transmit power level and a received DMC device power level; and setting a transmit power level for transmission to the DMC device (220, 410) according to the first pathloss, PL BS, and the second pathloss, PL D, wherein setting the transmit power level comprises selecting a minimum one of a transmit power level among a minimum transmit power level, P D, resulting in a successful detection and decoding at the DMC device (220, 410), a maximum transmit power level, P iBS, resulting in a maximum interference level, P i, at the base station (205, 420) and a maximum transmit power level, P MAX, of the transmitting DMC device (215, 405). estimating a first pathloss, PL BS, of a first channel from the transmitting DMC device (215, 405) to a base station (205, 420) according to a difference between a known base station transmit power level and a received base station power level; estimating a second pathloss, PL D, of a second channel from the transmitting DMC device (215, 405) to the DMC device (220, 410) according to a difference between a known DMC device transmit power level and a received DMC device power level; and setting a transmit power level for transmission to the DMC device (220, 410) according to the first pathloss, PL BS, and the second pathloss, PL D, wherein setting the transmit power level comprises selecting a minimum one of a transmit power level among a minimum transmit power level, P D, resulting in a successful detection and decoding at the DMC device (220, 410), a maximum transmit power level, P iBS, resulting in a maximum interference level, P i, at the base station (205, 420) and a maximum transmit power level, P MAX, of the transmitting DMC device (215, 405).