Discovering With QoS the geo-located Web services over next generation of mobile networks

Discovering with QoS the geo-located Web services is a great challenge in the client mobility context. In this paper, we propose a mechanism that collects for a particular geo-located Web service in a specific domain controlled by a geo-located discovery server GLWSM (geo-located Web services manager) the network bandwidth and the utilization factor of a supplier application server (SAS). Data collected are used in the application servers' selection and migration criterion. For a specific geo-located Web service, a GLWSM sends periodically a collect traffic request to all SAS that offer the concerned service in his domain. Then, each implicated SAS executes two processes: the network bandwidth quotation and the SAS utilization factor collection. In the network bandwidth quotation, a SAS interact with the mobile anchor point (MAP) of a GLWSM domain, to collect the network bandwidth. Meanwhile, the SAS utilization factor consists of collecting the SAS processor rate. To justify the benefits of our concept, we built a prototype that uses the NS-2 simulator and the RSVP (resource reservation protocol) protocol and we analyzed the consistency of the GLWSA system. Results prove that the proposed concept has a better responsiveness compare to a similar discovery servers with QoS.