BAC: BANDWIDTH BASED ADMISSION CONTROL SCHEME FOR GATEWAY RELOCATION IN IEEE 802.16e NETWORKS

The next generation wireless communication system aims at supporting multimedia services with different Quality of Services (QoS) and bandwidth requirements. Therefore effective management of limited resources is important to enhance network performance. Access Service Network Gateway (ASN GW) relocation is the process of changing the traffic’s Anchor Point (AP) from one GW to another which is independent of Mobile Station’s (MS’s) Link Layer (LL) handover. The existing standards have details about the ASN relocation procedures, but do not specify when the ASN GW relocation has to be performed. As relocation is closely related to Admission Control, the proposed system combines gateway relocation and Admission Control to determine when to perform ASN GW relocation. This novel Bandwidth based Admission Control (BAC) Scheme considers the size of requests from each MS rather than taking the number of MSs as a whole. This mobility management scheme defined for WiMAX networks minimizes handover delay, packet loss, handover dropping probability, new call blocking probability and maximizes the throughput.