$M$-Gated Scheduling and Cross-Layer Design for Heterogeneous Services Over Wireless Networks

In this paper, we extend the results of our previous work, which mainly focuses on homogeneous services, and discuss the heterogeneous scenario. A cross-layer design is proposed for IEEE 802.16/WiMax networks, in which three modules are added: 1) an
M
-gated scheduler; 2) an admission controller; and 3) a parameter controller. The parameter setting for the
M
-gated scheduler is based on performance analysis and different services' features, whereas the admission controller policy is deployed on the theoretical results. Using the probability-generating function, a queuing model is developed for the system under the proposed cross-layer design. In the queuing model, the ldquowirelessrdquo feature that the capacity of the channel randomly varies with time is considered. Simulations validate the theoretical results and demonstrate the performance of the proposed cross-layer scheme. For real-time services, the proposed scheme can achieve the goal of users' quality-of-service (QoS) demand in most cases and saves more surplus bandwidth for the best effort (BE) service. For BE, the proposed scheme can make a good tradeoff between bandwidth utilization and the left bandwidth for BE.