Measurement-Based Admission Control for Non-Real-Time Services in Wireless Data Networks

Non-real-time services are an important category of network services in future wireless networks. When mobile users access non-real-time services, mobile users usually care about two important points; one is whether mobile users are not forced to terminate during their lifetime, and the other is whether the total time to complete mobile users' data transfer is within their time tolerance. Low forced termination probability can be achieved through use of the technique of bandwidth adaptation which dynamically adjusts the number of bandwidths allocated to a mobile user during the mobile user's connection time. However, there is not a metric at a connection level to present the degree of the length of the total completion time. In this paper, we describe a quality-of-service metric, called stretch ratio, to present the degree of the length of the total completion time. We design a measurement based call admission control scheme that uses the stretch ratio to determine whether or not to accept a new mobile user into a cell. Extensive simulation results show that the measurement based call admission control scheme not only satisfies the quality-of-service requirement of mobile users (in terms of the stretch ratio) but also highly utilizes radio resource.