A CENTRALIZED AND DISTRIBUTED BASED FORWARDING TECHNIQUE TO IMPROVE THROUGHPUT IN MULTI - HOP WIRELESS MESH NETWORKS

Wireless Mesh Network (WMN) is a multiradio multihop network that is emerged as prime technology for the next generation wireless networks. Because of their vantages over other wireless networks, WMN gains rapid progress and renders numerous applications. This paper presents high throughput reliable multicast in multihop wireless mesh networks. The combined MAC layer retransmission, link quality awareness and wireless broadcast advantage are capture to design Expe cted Multicast Transmission Count (EMTX). EMTX based multicast routing will give high end to end packet delivery, less hop by hop transmissions per packet. The objective of EMTX metric is to minimize the transmission count and keep the throughput reliabil ity of the system in specified level. We propose a polynomial - time greedy algorithm for the multicast problem and analyze its worst - case approximation ratio. Further, we extend the centralized algorithm to a distributed version as an EMTX based multicast r outing protocol, and demonstrate their effectiveness in tackling the EMTX - based multicast problem with a combination of theoretical and numerical results. Simulation experiments show that, in comparison with two baseline approaches, EMTX - based multicast ro uting reduces the number of hop - by - hop transmissions per packet by up to 40% and yet improves the multicast throughput by up to 24%.