An Efficient Call Admission Control Scheme for Handling Handoffs in Wireless Mobile Networks

Abstract

Personal Communication Network (PCN) is an emerging wireless network that promises many new services for the telecommunication industry. The proliferation of demands for extending wireless services to integrated services, which supports the transmission of data and multimedia information, has resulted in the need for broadband wireless systems that are able to provide service capabilities similar to those of wire line networks. The ATM cell- relay paradigm is one possible approach to provide broadband wireless transmission with PCN’s using the ATM switching networks for interconnection of PCN cells. As traffic in these mobile cellular networks increases,Handoffs will become an increasingly important issue . As cell sizes shrink to accommodate an increasingly large demand of services, newer more efficient handoff schemes need to be used. In this paper, the authors describe the use of novel and efficient data structure which dynamically allocates guard channel for handoffs and introduces the concept of channel borrowing strategy. The proposed scheme allocates the guard channels forhandoff requests dynamically, based on the traffic load for certain time period. A new originating call in the cell coverage area also uses these guard channels if they are unused. Our basic idea is to allow Guard channels to be shared between new calls an d handoff calls. This approach maximizes the channel utilization. The simulation results prove that the channel borrowing scheme improves the overall throughput.