A Pervasive Computing Environment includes a variety of communication networks and service systemsand has places suitable for providing variety of services to client. One of the most important problems insuch environments is service discovery, i.e. how a client can use his service of interest. In a PervasiveComputing Environment Context, information plays an important role for providing more suitable servicesto the client. So in this paper, we present a method context aware service discovery with use of contextsource in the form of an advertisement board for services. A context source with an information register ofnew entry services and, in addition, forwarding packets, acts like a billboard advertising service. In thiscontext source method, it provides help in registering and advertising services but is not a directory and, ifthe context source fails, our method can undertake service discovery with other nodes in environment. Toevaluate this method a simulation has been carried out. Its statistics and outputs show our suggestedmethod, with its dynamic environment, client movement, directory less, and use of a context source is asuitable method for service discovery which has better results and costs less money and time.
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