The Research On Routing Protocols For MANETs

A mobile Ad Hoc network (MANET) is a collection of wireless mobile nodesdynamically forming a temporarymultiple-hop network without the use of any centralcontroller or existing net-infrastructure. In this condition, duo to the limitation of thetransmission range, nodes which could not communicate with each other directlymustuse another node to deliver the packet. Nodes in mobile ad hoc networks transmit databymulti-hop, so a routingprotocol to determine the waydata packet to be delivered isneeded. Thus, the design of routing protocol is one of the key issues of mobile ad hocnetworks.AODV is a classical on-demand routing protocol for MANETs. Although AODVhas advantages such as low routing overhead and high efficiency compare withtable-drivenroutingprotocols,italsohavesomelimitationsofitsown.In this paper, a novel routing protocol based on R-AODV was proposed. Theprotocol inherits the reverse routing mechanism of R-AODV which efficiently reducethe overhead caused by missing of routing request message. With a cross-layercongestion algorithm utilized in this protocol, congested nodes cam be avoided duringthe routing finding section, the load balance of the whole network and lower routingoverhead is ensured. The simulation result shows that LBR-AODV performs well indelayanddeliveryprobabilityunderdenseandrapidmovingcircumstances.