A Study Of The PHY-MAC Cross-layer Design Based On IEEE 802.16 Mesh

With the people's increasing needs of network communication, we hope to touch with each other in fast and accurate way whenever or wherever. In order to improve the efficiency and overcome the shortcomings of existing communication system, achieving communication ubiquitous, a new broadband wireless network architecture——wireless mesh network was proposed. It is a multi-hop wireless network connecting routers and terminal devices with wireless link. With the characteristics of high rate and high capacity, WMN is treated as a good alternative to solve the last mile related problem. As the continuous development of WMN technology, IEEE802.16 standard provides a networking model for multi-hop mesh, which can be deployed with high speed in wide area wireless network.. With these features, IEEE802.16mesh has attracted great interest in research.However, due to the characteristics of WMN in terms of topology, transmission link and traffic, the conventional layered protocol design methods for wired networks, which makes it difficult to adapt to wireless communication environment with constant changes. Therefore the existing protocol stack improved by cross-layer design can realize self-adaptive optimization of resources according to the wireless environment changes, in order to utilize effectively wireless network resources ,improve the performance of the systemThis paper presents a cross-layer design framework, which mainly consider the cross-layer optimization between physical layer and MAC layer, for the purpose of increasing capacity and interference suppression. A new cross-layer design which is based on SNR and BER resulting mechanisms for receiving frames and a Interference-Aware scheduling are proposed. We simulate the network in some different states. The performance evaluation results show that based on the channel information collected from PHY layer, the proposed mechanism reduce the negative impact of the interference and increase the average throughput of the network.And the performance evaluation results also show shat the proposed mechanism achieves significant progress in delay and packet loss rate over the basic mechanism in 802.16 mesh network.Finannly, the thesis is concluded and the future work is prospected.