Research And Implementation Of Wireless Multi-hop Link Layer Protocol

Wireless multi-hop network is a multi-hop communication network,which is composed of a number of mobile nodes with wireless transmitter and receiver.It can fast network based on the environment.Wireless multi-hop network has no central nodes,routing or control devices,and can adapt to rapidly changing topology,fast network,and with a strong survivability and robustness.So wireless multi-hop network is widely used in the field of reconstruction,military communications,unmanned aerial vehicles.In wireless multi-hop networks,MAC protocol control radio channel access,wireless channel resource allocation between nodes,and building multi-hop wireless network infrastructure.Scholars have research fixed distribution,competitive access methods in MAC protocols.Normally,these MAC protocols are designed for slower scenes.For high-speed mobile scenario,node moving speed may reach the speed of sound,the link may frequently fail,and the channel interference is also very serious.Taking into account the special nature of the scene,we need to improve the existing MAC protocols to conform to high-speed mobile ad-hoc network nodes.Based on such fast-moving scenes,we design a TDMA-based MAC layer protocol.The MAC layer protocol will enable nodes in this scenario to network rapidly,to maintain the neighbor list and connection matrix,to forecast link existent time.The MAC protocol can collaborate with routing protocols,and making high-speed mobile node communicate with each other in multi-hops.Complete simulation of wireless multi-hop networks on ns2 platform,and analysing the simulation results.Finally,achieve MAC protocol on the uC/OS-II embedded systems.