Improving Multicast Resource Utilization in WiMAX Multihop Relay Networks

In IEEE 802.16j based WiMAX multihop-relay networks, in addition to a base station, multiple relay stations are used for enhancing the throughput, and improving the coverage distance of the base station. Multicasting is a more efficient method of supporting group communication than unicasting, as it allows transmission and routing of packets to multiple destinations using fewer network resources. An important issue in the multicasting of WiMAX multihop-relay networks is the improving resource utilization of multicast tree and most existing algorithms try to minimize the total energy of a multicast tree to improve resource utilization. In contrast to this problem we propose Optimum Subscriber Station Serving (OSSS) scheme to improve multicast resource utilization by improving number of recipients in multicast tree for given resource budget. OSSS scheme is a resource allocation scheme which adjusts the distribution of resource in multihop-relay network to increase number of recipients in multicast tree.