Demand and grant MAC schemes for best effort service in wireless MAN
Jin Kyung Park, Woo Cheol Shin, Jun Ha, Cheon Won Choi · 2006
In the IEEE 802.16 Wireless MAN standard, the best effort service class is ranked on the lowest position in priority and is assisted by a MAC scheme based on reservation ALOHA. The details of the MAC scheme, however, are not specified in the standard. In this paper, we present the rules for deciding the amount of resource to demand as well as the rules for deciding the amount of resource to grant. Combining these rules, we then construct candidate MAC schemes for the best effort service. In designing a MAC scheme for the best effort service, the throughput and delay performance must be considered since only scarce resource may be available after resource is preferably granted to other service classes. For the performance evaluation, we thus develop a numerical method to approximately calculate the throughput in the saturated environment. Using the approximation and simulation methods, we then investigate the throughput and delay performance exhibited by each candidate MAC scheme. From the numerical results, we observe that the exhaustive demand rule paired with the full grant rule shows superior performance.