The Research On Service Discovery Protocol For Pervasive Computing

With the continuous development of electronic information technology, all kinds ofportable computing devices become more and more popular. Human have to face more andmore complex computing environment, the problem of computing model become more andmore delicate. The computing model evolution experienced3ages, they are:“MainframeComputing” Many people sharing a mainframe host;“Personal Computing” each personusing one computer;“Internet Computing” the current era，one user using a plurality ofnetwork resources. The development of computer technology has been accompanied by theevolution of calculation model. In recent years, small computation and communicationequipment become more an more popluar, the sensor technology, embedded technology andInternet technology, more and more Mature, the computational requirements become moreand more diversified, intelligent, whenever and wherever possible. To adapt to thesechanges, we need a new computing mode, which is the next generation computing model--pervasive computing. Pervasive computing is not a new technology, but it is a computingmodel in which useing computer technology, communication technology, sensor technology,network technology, embedded technology to achieve the information space and physicalspace integration.In pervasive computing environment, people can whenever and wherever possible thesimple, transparent use of network services, in order to achieve this goal, we need thesupport of service discovery technology. Service discovery technology is when the user tohave the service demand, the system how to efficiently for users to search, matching thebest service, and provides the service to the user. GSD(Group-based Service Discovery) is awireless ad hoc network environment neutral to an agreement more prominent. GSD hassome characteristic as sgroup-based intelligent forwarding service request, serviceadvertising information of nodes periodically broadcast their own. So that the user canmore efficiently to discover service in the environment of pervasive computing.But GSD protocol itself existed some shortage (Such as: a large number of repeatedservice request packet), So GSD is not very good to adapt to the charac teristics of pervasivecomputing environment. In order to solve these problems, according to the features ofpervasive computing is found in service environment, this paper proposes an improvedprotocol based on GSD protocol, it is named “EPGSD”(Enhanced PerformanceGroup-Based Service Discovery). And through simulation experiments related to do in theGloMoSim simulation software, show EPGSD protocol some aspects of performance, andproved the validity of the EPGSD.