QOS-APCVS: AN ENHANCED EPS-IMS PCC ARCHITECTURE PROPOSAL TO IMPROVE MOBILE SERVICE DEPENDABILITY

IP Multimedia Subsystem’s (IMS) presents the framework architecture which can provide multimedia services for Evolved Packet System (EPS). In busy network, the main failures are service blocking, handover outage and non satisfying QoS criteria. So we aim to improve dependability of dedicated bearer establishment in EPS-IMS Network. In mobile access network, we consider service is available if it is admitted by base station and is reliable if it is still supported in handover position. In core network, we consider service as reliable if its QoS criteria are satisfied. So we propose a new Qos Provisioning solution. To provide new application or to support handover service in busy network, our approach preempts resources by utility factor instead of priority consideration in existing works. In addition to bandwidth reservation our solution allows core network reservation to improve the delay of real time service and minimize the loss rate of non-real time services.