The Analysis Of The Hierarchical Routing Protocol Based On 6 Lowpan And Optimization

IEEE published the first version and second version of Low-Power WirelessPersonal Area Network at2003and2006.This protocol provided base standard forlow-power,low transport range devices.Base the mechanism of LR-WPAN IETF designthe6lowpan which successfully make traditional wireless sensor network devices couldcommunicate with IP devices,lead to the seamless connection between wireless sensornetwork and traditional internet.In our work,the analysis of6lowpan protocol stack isfrom down to top.Firstly,we give a brief introduction about IEEE802.15.4and its upper application6lowpan.We provide a basic content of IEEE802.15.4which was regarded asinfrastructure of6lowpan, including superframe structure,carry sense multi access andcollision avoidance channel access mechanism. Primitives order of establishing networkand channel scan primitives order are deeply imposed, We also comprehensivelyanalysis the key technology of6lowpan,and its application scene,dynamic addressassignment and hierarchical multi-hop routing protocol.At the end of this chapter,wemention some research aspects about6lowpan and summary this chapter.Secondly, Based on the basic mechanism before,we provide a discrete-time Markovchain to evaluate IEEE802.15.4performance and its parameters in order to familiarwith the infrastructure comprehensive performance of the6lowpan.In ourexperiment,we analysis the relationship between network throughput and backoffexponent or backoff times.Then, we focus on the network establishing process which consist of manyparts.Fisrtly,we provide a new channel scan primitive order which could shorten thedelay of establishing the network,further more,we design a new dynamic addressassignment algorithm called Bi-Address assignment Algoritmh(BAA),by providingtwo-demension address and two-way address allocation,when it is impossible toallocate short address in high dimension,BAA then allocate short address in low dimension.In this way BAA improved the node success rate of aquiring short address.Finally, based on BAA algorithm metioned before we provide a new hierarchicalrouting mechanism called Multi-Path hierarchy routing to solve the problem that thefailure node block the routing process. WSN traditional find next hop by sendingrouting packet, however, MHR find the next hop by judge the relationship between thecurrent node and destination node.In the process of searching a new next hop to thedestination node,we effectively control the broadcast in order to save node devicepower and solve the problem mentioned before.Through extending the simulation module of NS2IEEE802.15.4, we compare ournew algorithm and original standard algorithm and find the fact that our methodNSCPO and BAA improved the performance, and then we also demonstrate the fact thatMHR algorithm could guarantee the packet transportation from one node to anothernode when there are some failure nodes in the6lowpan network.At last we summary all the work in this article and point out the future works.