Abstract
The routing efficiency in Mobile Ad Hoc Networks (MANETs) suffers from frequent battery drains, mobility and large variation of received signal strength. Thus, nodes and links in MANETs become more vulnerable and unstable. Multicast routing in MANETs for group communication requires establishment of reliable links between neighbouring nodes called as reliability pair beginning from the source and extending such reliability pairs enroute to the destination. If there are multiple paths from source to every multicast destination, the reliability of source information may be enhanced by sending higher priority information on higher priority path. In this paper, we propose a scheme of Information Priority based Multicast Routing in MANETs using multiple paths (IPMRM). IPMRM operates in following phases. (1) Reliability pair factor computation based on node power level, received differential signal strength between the nodes and mobility. (2) Pruning neighbor nodes that have reliability pair factor lesser than a threshold. (3) Finding multicast mesh routes with multiple paths to a destination using request and reply packets. (4) Priority assignment to multiple paths based on minimum value of reliability pair factor of a path and information transfer from source to multicast destination. (4) Route maintenance against link failures. The simulation results for packet delivery ratio and control overhead demonstrate better performance of IPMRM over On Demand Multicast Routing Protocol (ODMRP) and Enhanced ODMRP (EODMRP).
Highlights
Wireless links in Mobile Ad Hoc Networks (MANETs) are unstable due to large variation of channel characteristics
We propose a scheme of Information Priority based Multicast Routing in MANETs using multiple paths (IPMRM)
Packet Delivery Ratio (PDR) increases with increase in group size as multiple paths to every destination increase and these multiple paths carry more number of priority streams that helps to increase PDR
Summary
Wireless links in Mobile Ad Hoc Networks (MANETs) are unstable due to large variation of channel characteristics. One needs reliable routes which may be realized with the help of multiple paths. The routing scheme must ensure that the nodes which participate in route establishment and route maintenance have links with higher reliability. Reliable routing protocol design is a challenging research problem in MANETs [1][2]. Reliability of links depends on node power, received signal strength, mobility and physical conditions. The group communication services such as audio/video conference and surveillance applications require reliable nodes on the multicast path for continuous transfer of prioritized and non-prioritized packets
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