The recent deployment of several wireless access technologies such as Wi-Fi, WIMAX and LTE brings to the mobile user the opportunity to switch from one network to another, in a seamless manner. To accomplish this, the mobile user must be able to discover which types of network connectivity are available. The IEEE 802.21 standard specifies a Media Independent Information Service (MIIS) that provides capabilities for discovering network information existing within a geographical area, to facilitate the handover process. The automation, representation and distribution of mobility information in heterogeneous networks are a big challenge, especially in a multi-operator environment. In this paper, we introduce a novel decentralised mobility information service architecture that improves the mobile user experience and ensures scalability for large system deployments. Additionally, a meticulous evaluation using the NS-2 network simulator is presented. The results demonstrate that our research outperforms the standard MIIS approaching in terms of query delay, users optimal performed handovers and communication overhead. Also, the proposed scheme contributes to a decrease of the traffic at the operators core network and internet.
Magazine: International Journal of Ad Hoc and Ubiquitous Computing