A Geographical Information Wsan Routing Design (gpsa)

In recent years,we have witnessed a growing interest in the application of wireless sensor networks(WSN) in unattended environments.Some examples of such applications include military usage,environmental monitoring,disaster management, emergency service and so on.WSN is composed of a large number of sensor nodes,working in an ad-hoc way. The nodes can be deployed manually,or by air-planes,or even by rockets.Compared with other wireless technologies such as GSM,Blue Tooth or WLAN,WSN has no center nodes,each node in it is self-organized and responsible for discovering and maintaining routes to other nodes.WSN is a self-created,self-grouped and self-organized multi-hop network.Based on WSN technology,Wireless Sensor and Actor network(WSAN) is first introduced by Ian F.Akyildiz.Recently,achievements have been made by researchers of this field.Wireless sensor and actor network(WSAN) refers to a group of sensors and actors linked by wireless medium to perform distributed sensing and acting tasks.In such a network,sensors gather information about the physical world,while actors make decisions and then perform appropriate actions upon the environment.In order to provide effective sensing and acting,a distributed local coordination mechanism is required among sensors and actors.Moreover,in order to perform right and timely actions,sensor data must be valid at the time of acting.Thus,one of the main goals in WSANs is to decrease the communication latency in the network.This paper includes brief introductions to wireless sensor networks(WSNs) and WSANs,my newly designed geographical information based routing protocol for WSAN(GPSA),a simulation on this protocol and the result analysis.In WSANs the communication problem between adjacent sensors or actors can be resolved by traditional protocols of mobile ad-hoc networks.So this paper is focused on resolving an Actor-Sensor-Actor mode communication problem.As for the special characteristics of WSANs,the actors are always much more powerful in some ways than sensor nodes,such as mobility,computational capacity and large battery. So it's almost always much better to use an actor to relay information than to use a sensor,if we want lower latency and longer network lifetime.As for some limitation of this paper,network lifetime is not considered too much.However,a performance comparison of the volume of protocol packet sent is still presented at the end of this paper.As for the differences between WSN and WSAN,most traditional network protocols in WSN are not suitable in WSAN.For example,in most WSNs,sensor nodes are of the same type except sinks,moreover,the concentration of a WSN network protocol is always about the network lifetime but not the latency of the information transmission.And sink nodes of WSNs are always assumed to be stationary.