1. A method for processing a signal to be transmitted from a transmitting entity to a receiving entity, the method comprising: selecting a transmit channel from at least two transmit channels associated with the transmitting entity, wherein each of the at least two transmit channels has an associated back-off factor and transmit power, and wherein the transmit power for each of the at least two transmit channels is based on the back-off factor for the transmit channel, and wherein the selecting is based on the back-off factor of the selected transmit channel and on at least one attribute associated with the receiving entity; and assigning the selected transmit channel to the receiving entity.