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Vehicular networks are highly mobile wireless networks that can provide wide variety of services and applications such as public safety communications, crash avoidance, multimedia and Internet access in highways. Designing routing algorithm in vehicular network is a challenging task due to rapidly changing topology and high speed mobility of vehicles. One of the critical issues of vehicular network is frequent path disruptions caused by high speed mobility that leads to broken links which results in low throughput. This poses complex challenge in ensuring quality of service (QoS). A lot of research around the world is being conducted to define the standards for vehicular communication. In this paper, we study the effect of different duration of transmitting packet and compare different packet size on sending and received packet rate in IEEE 802.16j MMR networks using NCTUns. Meanwhile, cross-layer routing approach is proposed to overcome the challenge. The routing approach is expected to significantly improve QoS in vehicular networks.

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Multi-hop relay technology is designed to provide capacity enhancement and coverage extension for wireless broadband access system such as WiMAX and LTE-Advanced. However, overall system performances worsen as the number of hop increases. For this reason, resource control function specifically route selection problem should be tackled precisely so that better system performance can be achieved. Route selection or routing is a process to identify the best route to deliver information from source to destination by considering the constraints of available radio resource of the route. In this paper, we proposed a new route selection scheme named as Link Aware Route Selection Scheme (LARSS) for WiMAX Mobile Multi-hop Relay Networks aiming at maximizing network throughput and minimizing end-to-end delay. The proposed scheme exploits link quality and hop count as route metric. We conducted simulation study to evaluate the performance of the proposed scheme. Through the simulation, our proposed scheme outperformed the existing scheme in term of throughput and end-to-end delay. General TermsAlgorithms