Research And Development Of The Low-Power Ad Hoc Network Routing Protocol Based On Location

A wireless ad hoc network does not depend on fixed communication infrastructures completely.It has the characteristics of fast networking and strong destruction resistance.Therefore,wireless ad hoc networks have been widely used in battlefield operations,disaster relief,or emergency search scenarios.In some special scenarios,since the portable communication devices use batteries as power supply,it is very important to reduce the power consumption of nodes and prolong the network lifetime.The design of routing protocol plays a key role in reducing power consumption by controlling protocol overheads.The LAR protocol is a classical protocol,which utilizes network node locations.It can restrict the region of the forwarding message and decrease the power consumption of the whole network by leveraging the nodes' location information.However,the LAR protocol still has some drawbacks,which include a limited size of the request region during the routing establishment and low probability of successfully establishing a route in the first path search.In addition,it does not consider the stability of the selection path in the routing establishment.When it fails to establish a route,it will directly turn to the broadcasting approach resulting in an increase in network loads.For the aforementioned deficiencies of the LAR protocol,a new protocol,LPC-LAR,is proposed.Firstly,the LPC-LAR protocol predicts the position of a node during the routing establishment.This increases the probability of establishing a route in the first path search.Secondly,the LPC-LAR protocol optimizes the selection strategy of forwarding nodes within the request region.Only the neighbor nodes in the optimal candidate region are qualified.The selection of forwarding nodes in the suboptimal candidate region depends on the optimal candidate.This reduces the number of forwarding nodes and improves the stability of the path.Finally,the LPC-LAR protocol replans a new request zone when it fails to establish a route,and then sends a route request packet to complete the route establishment.This prevents the route request from turning into the broadcasting approach.Through the optimizations of the above three aspects,the LPC-LAR protocol improves the stability of the path and reduce the number of the broadcasting approach as well as that of forwarding nodes.Thus,it reduces the power consumption.To validate the performance of the LPC-LAR protocol,some simulations are done on the OPNET platform.Through different network scenarios,such as different node movement rates and network sizes,LPC-LAR protocol is compared with LAR protocol in those performance overheads like control overhead,packet arrival rate and end-to-end delay.It is shown that the LPC-LAR protocol has a higher packer delivery rate as well as a lower control overhead.Essentially,it has a lower power consumption and has a better performance in comparison with the LAR protocol.