| Wireless Mesh Networks(WMN) with self-organization, self-healing features as next-generation wireless network has recently been attracted much attention.. Compared with traditional single-interface single-channel Wireless Mesh Network, multi-interface multi-channel(MRMC) Wireless Mesh Network with multiple interfaces transmitting and receiving data has a higher throughput. So the rational design of channel allocation algorithm is crucial for MRMC-WMN. Existing MRMC-WMN mainly uses orthogonal channel allocation, while limited orthogonal channel resources causing co-channel interference. With the development of radio technology, interference between partially overlapping channel has been effectively controlled, so the use of partially overlapping channels can take advantage of channel resources to improve system capacity. Meanwhile, WMN can transmit data using unicast, multicast or broadcast way. As the number of users and demand increases, multicast transmission technology has been recognized as a key way to meet more customer needs, improve utilization and packet network efficiency, increase network capacity. Most channel allocation algorithms for multicast and routing algorithm only consider a scene of single multicast session, without fully considering issues of multiple multicast sessions which can increase system capacity. In a word, under the MRMC-WMN environment with multiple multicast sessions, channel assignment of using partially overlapping channel and routing metric are important.This paper considering the environment of having multiple multicast sessions, proposes a new load and interference-aware multicast channel assignment algorithm(LIMCA). This algorithm using heuristic algorithms assigns channels for having higher load-interference weight nodes, so as to achieve more success multicast clients which can receive multicast packets to ensure that the purpose of transmitting data successfully. The higher load-interference weight of the nodes, the greater inter-flow interference between other existing multicast session and newly arrived multicast session, intra-flow interference within newly arrived multicast session, and the load of itself Simulation results show that the algorithm can effectively improve network performance.With the rapid development of multimedia services, media traffic results WMN node having more load traffic. If the route does not take into account the nature of traffic load patterns and interference by surrounding nodes, it will increase excessively congestion and interference on the wireless channel around some gateways, or a few gateways can get overloaded while others are underutilized, resulting longer delay, higher routing overhead and so on. Therefore load balanced routing metric considering load and interference becomes a challenging task in WMN. In this paper, under the environment of having multiple multicast sessions, proposed Load-Balancing and Interference-Aware Routing Metric(LBIA) considers the intra-flow interference, inter-flow interference and load balancing. The multicast session node constructing multicast tree according to LBIA routing metric transmits information. This metric using load balancing factor balances the load of each link in multicast session, selecting a small load of link to transmit information, achieving the purposes of load balancing. Firstly, LBIA calculates the load-interference weight of all nodes in new arrival multicast session; Then using load-interference weight calculates load, and the load balancing factor can help child nodes find a suitable father nodes, balancing the load in entire network; Finally build multicast tree and assign channels.In this paper, NS-3 simulation platform, provide environment of multiple multicast session simulation platform for channel assignment and routing metric algorithms. It can be tested that the proposed algorithm can improve average network throughput, average packet loss ratio and average end-to-end delay. |
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