Opportunistic Access With Random Subchannel Backoff (OARSB) for OFDMA Uplink

A distributed Medium Access Control (MAC) algorithm for uplink OFDMA networks under the IEEE 802.16 framework is proposed and analyzed in this paper. The authors present a simple yet efficient algorithm to enhance the system throughput by integrating opportunistic medium access and collision resolution through random subchannel backoff. Consequently, the resulting algorithm is called the Opportunistic Access with Random Subchannel Backoff (OARSB) scheme. OARSB not only achieves distributed coordination among users but also reduces the amount of information exchange between the base station and users.