A Nonslotted Random-Access Channel with Higher Utilization

The paper considers a nonslotted random-access radio channel with users divided into a few classes. Assuming that capture exists between these classes of users and that users allotted to different classes use packets of different lengths, packet and data throughput are obtained. A set of packet lengths is found for which these throughputs exceed throughputs in the case when all users use equal-length packets. Finally, the sets of packet lengths and class traffics are obtained to give the global maximum channel utilization.