Research On The Dynamic Slot Assignment Algorithm Based On TDMA In Ad Hoc Network

With the rapid development of wireless communication technique and people's increasing demand for communication,Mobile Ad hoc network featuring which doesn't need fixed communication facilities,the free movement of network node,the rapid networking and strong destroy-resistance has caught much attention of the public and become one of the key areas of the development of the mobile communication technique.In order to realize the normal communication of Ad hoc network,many technical problems should be tackled.As one of the most important techniques of Ad hoc network,the design of the Media Access Control(MAC)protocol plays a decisive role in the normal communication of Ad hoc network.Thus,design a high performance of Media Access Control protocol is very vital to improve the performance of the whole networking.In this thesis,we focus on the dynamic slot allocation algorithm based on TDMA in distribution protocols.By combining the actual engineering projects and the analysis of the working principle of the current dynamic TDMA protocol in the Ad hoc network both home and abroad,the thesis has put up with a dynamic TDMA protocol based on the information around the nodes,which is called NI-TDMA protocol.The nodes create their time slot occupation table in two hops by monitoring the periodical transmission control packet of the neighboring nodes in the control time interval,and through a series of security mechanisms to ensure that the appointment and release of node information slots effectively and reliably.Using the NS-3 network simulator as the simulation platform,this thesis has respectively tested the functions of NI-TDMA protocol,FPRP protocol and IEEE802.11 protocol in three different network environments,namely,the link topology,grid topology and random topology,and drawn the index curve of the network throughput,the average end-to-end access delay,and the packet loss rate of them according to statistics.By conducting the comparison and analysis of the stimulation results,the thesis has drawn to a conclusion that compared to IEEE802.11 and FPRP protocols,NI-TDMA protocol performs better in terms of the three aspects.