The Research Of Coding-Based Routing Technology In Wireless Mesh NetWork

As the tremendous expanding of radio communication and the growing demand for wireless broadband access,It is more convenient for people to use wireless network to communicate,this put a challenge for the speed,quality,stability and other aspects of wireless communication network.Wireless mesh network is a promising wireless access system,it has wide application range,large network capacity,high access rate,and low network deployment cost,it is a kind of competitive technical scheme to deal with the final one kilogram problem.However,owing to the limitation of the wireless channel frequency bandwidth,the wireless interference,multi-path fading and noise problems are more serious,making the improving of wireless network throughput become an urgent problem to be solved.The research of high performance routing protocol is an effective way to improve the overall performance of the network.There has been extensive studies on network coding and it is considered to be an effective way to increase the network throughput.Network coding allows packets from different nodes to be encoded and then transmitted,it reduce the number of packets transmission,has been confirmed to be able to close to the upper bound of the network throughput.With the development of the research,some scholars combine network coding technique and routing technique to form a network coding-based routing technique.Coding awareness routing can actively detect coding opportunities in the procedure of routing discovery,so that the network coding benefits can be maximized.The existing coding-aware routing technology simply considers the increase of coding opportunity,but ignores the problem that the data flows to a few nodes to form a hot spot area,and over-coding makes the encoded data packets can not be decoded,which will cause coding collision and network congestion,resulting in decreased network performance.Therefore,on the research of wireless mesh networks,it is important to consider load balancing and avoid coding conflicts.This paper firstly introduces the wireless mesh network technique and network coding technique and then introduces the WMN non coding routing and network coding routing.At last,the problem of network coding is given an further exploration,which is liable to be caused by wireless mesh network,the convergence of network data flow,the formation of hotpot region,and the problem of network coding collision.The core activities of this article launches from the following aspects:According to the network encoding aware routing caused by network congestion problems,this paper designed a network load balancing routing metric LCCa(Load balance and Coding Aware Multi-path HWMP Metric),its comprehensive consideration of network encoding gain and load problems.On this basis,a Load Balancing and Coding Aware Multi-path HWMP Routing(LCAMHR)protocol is proposed.LCAMHR uses a multi-path mechanism and load factor to disperse the traffic of the network.It is a compromise protocol that maximizes the chance of encoding and load dispersing,and can dramatically increase the serviceability of the network.Aiming at the problem of encoding collision caused by over-encoding,this paper introduces the necessary restriction and redefine the coding condition on the basis of existing coding conditions,and proposes a CDS-based optimizing coding-aware and Collision Avoiding Routing(CCAR).In addition to solving the problem of encoding conflict,CCAR also utilizes the nodes in the CDS to improve the coding opportunity.CCAR synthetically considers coding opportunity optimization and collision avoidance,finds more coding opportunities and avoids the generation of coding collision,making wireless mesh network obtain higher throughput.