As service-oriented networks are essential in our lives, service location, access and provisioning over wired or wireless networks govern users' satisfaction. While they are well understood over cellular networks, it is not clear for ad hoc networks. We therefore present several approaches on service location in such networks: distributed broadcast query, query via service coordinators, and a hybrid combination. Particularly, we evaluated these approaches in terms of service availability and control overhead over variable network sizes and mobility scenarios. Simulation results showed that the distributed query approach suffered from high control overhead despite its robustness and tolerance towards mobility. The service coordinator (SC) based approach, however, resulted in a more scalable architecture that tends to separate the network into different service areas. This has important implications on future "mobile marketplace" and services to mobile users. Finally, the hybrid approach provided greater flexibility and robustness to the SC-based approach with its scoped broadcast to limit the overhead.
Ad-hoc networks are infrastructureless networks formed on-thefly by devices with wireless communication capabilities They have bandwidth and device power limitations, as well as the need to deal with mobility. If clientserver interactions are to be present in such networks, a method for performing service location is needed. When two nodes that are several hops apart communicate, resources on all the intermediate nodes are wasted, so it is better to find services that are "closer" to the clients. This paper evaluates distributed and centralized architectures for service location, In particular it will examine service availability and message overhead performance using simulations. The fmdings reveal the best approach that can be used as an underlyiug structure for higher layer service location protocols.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.