Analysis of Traffic Distribution and Blocking Probability in Future Wireless Networks Ronald Beaubrun, 1,3 Samuel Pierre, 2 and Jean Conan 2 Future wireless networks are envisioned to provide good quality multimedia services to mobile users anywhere at anytime. Traditional analysis of teletraffic in such networks assumes that call arrivals follow a Poisson process, as each cell is being modeled as an M/G/c/c queueing system. This does not reflect the real situation since handoff traffic arrivals are not generally Poissonian. In this paper, we propose to model each cell in future wireless networks as a G/G/ c/c queueing system. As such a model has not been explicitly addressed in the literature, our main contribution is to propose a solution which enables to evaluate both traffic distribution and blocking probability within each cell of the service area. Result analysis reveals that coefficient of variation of call arrivals has more impact on the network performance than coefficient of variation of channel holding time. KEY WORDS: Blocking probability; queueing system; traffic modeling; wireless network 1. INTRODUCTION Future wireless networks are aimed at providing integrated services and accommodating both voice, data and video to a variety of mobile users (pedes- trians, vehicles) anywhere at anytime [1,2]. Such networks raise challenging problems in teletraffic analysis, since the traffic intensity within the service area depends on the random aspect of generating and terminating calls, as well as the user mobility. This paper presents and analyses a model which evaluates both traffic distribution and blocking probability in future wireless networks. Such an analysis enables to specify the conditions under which such networks offer good quality of service (QoS) in term of blocking probability. 1.1. Basic Concepts In a wireless network, radio links for communi- cation are provided by base stations (BSs) whose radio coverage defines a cell [1]. When a mobile user (MU) wishes to initiate or receive a call, the mobile terminal attempts to obtain a channel for the connection. If no channel is available, the call is blocked and cleared from the network. This is called a new call blocking. However, if a channel is available, it is used for the connection, and released either when the call is completed or the MU moves out of the cell. The channel holding time is defined as the amount of time that a call occupies a channel in a particular cell. Moreover, when an MU moves from one cell to another during an ongoing communication, the call requires a new channel to be reserved in the new cell. This procedure of changing channels is called a handoff. If no channel is available in the new cell during the handoff, the call is forced to terminate before its completion. This phenomenon is called a handoff call blocking. New call blocking and handoff call blocking probabilities are being considered as important design parameters for evaluating the level 1 Department of Computer Science and Software Engineering, Faculty of Science and Engineering, Universite´ Laval, Pavillon Adrien-Pouliot, Que´bec, Que´, Canada G1K 7P4 2 Department of Electrical and Computer Engineering, Mobile Computing and Networking Research Laboratory (LARIM), Ecole Polytechnique de Montreal, Montreal, Quebec, Canada 3 E-mail: ronald.beaubrun@ift.ulaval.ca International Journal of Wireless Information Networks, Vol. 14, No. 1, March 2007 (Ó 2006) DOI: 10.1007/s10776-006-0054-x 47 1068-9605/07/0300-0047/0 Ó 2006 Springer Science+Business Media, LLC