Admission Control Framework for Delay Bounded Traffic in Cellular Networks

In this paper we present an admission control framework for serving streaming connections to mobile users in wireless cellular networks. The network is assumed to allocate a fixed number of channels to streaming services, and serve each connection at a fixed data rate. In addition, it is assumed that each connection has specified bounds on the maximum tolerable start of service delay, and the total service interruption delay. The admission control problem is formalized as a discrete scheduling problem which the framework handles by utilizing a heuristic algorithm guided by a mechanism that dynamically adapts a scheduling planning interval according to the offered connection request pattern. The devised framework does not assume a priori knowledge of the distribution of the arriving requests from either the target cell, or as a consequence of handoff. Performance is compared against a scheme that assumes a priori knowledge of such traffic distribution and admits a stream only if the estimated cell overload probability, after a prescribed prediction interval, does not exceed a specified threshold value. The obtained results show improvements with regard to the achieved throughput of the connections served to completion, and forced terminations.