Efficient Cross-Layer Simulator for Performance Evaluation of Wireless Mesh Networks

Wireless mesh networks (WMNs) are emerging as a promis- ing technology for backhauling data tra±c from wireless ac- cess networks to the wired Internet that expected to support various types of applications with di®erent quality of service (QoS) requirements. While wireless mesh networking has attracted great industrial and academic interest, many re- search challenges remain in all protocol layers. Moreover, traditional layered approaches, initially designed for wired networks, have been proven insu±cient for WMNs due to the wireless channel variability, co-channel interference and new data tra±c peculiarities. In this work we provide a complete cross-layer solution for WMNs. Our protocol architecture framework comprises a novel joint QoS routing and opportunistic scheduling scheme that exploits the multi-user diversity gain while guarantees end-to-end packet delivery that satis¯es the multiple QoS requirements of the underlying applications. On top of this, the interaction of these algorithms with the transport layer is investigated where the suitability of several techniques, such as Explicit Congestion Noti¯cation, Explicit Loss No- ti¯cation and Explicit Rate Noti¯cation is considered. In order to assess the performance of the proposed protocols, a realistic and comprehensive simulation platform for WMNs that spans all layers from physical to application has been implemented using OPNET modeler. This paper provides a detailed description of the proposed protocols and the simu- lation platform together with some performance evaluation results.