Abstract—In this paper, we propose and analyze a different channel allocation scheme in mobile cellular networks which not only gives priority to handoff calls but also tries to protect originating calls. We use channel reservation to protect handoff calls and in contrast, to protect originating calls, we set a maximum reservable channel, NG, in our scheme. In channel reservation schemes, there are some periods that reserved channels are not actively utilized. In this paper, these periods are defined as dead time. Some new performance measures of the system such as the distribution and the mean dead time of a reserved channel are obtained. The main contribution of this work is to find optimum NG so as to maximize the service provider's revenue while customers' satisfaction (in term of connection continuity) and system utilization (in term of system capacity and less dead time) are justified jointly. We assume a general cost structure which is due to blocking of handoff calls, blocking of originating calls and unutilized periods of reserved channels. Based on the total cost, we investigate the trade-off between the service utilization and customers' satisfaction. Keywords: Resource management, revenue schemes, wireless communication systems, performance modeling. I. INTRODUCTION Technological advances and rapid development of handheld wireless terminals have facilitated the rapid growth of wireless communications. Taking ergonomic and economic factors into account, and considering the new trend in telecommunications industry to provide ubiquitous information access, the population of mobile users will continue to grow at a tremendous rate, while customers are expecting the same quality of service (QoS) 1 , availability and performance as the traditional wire-line networks. To cope with this challenge, many new modulation and multiple access techniques have been developed. But for a given spectrum and a specific technology used, the admitted traffic capacity and QoS of a cellular system depends on how channels are managed. Since from the subscriber’s view point, forced 1 We limit the QoS discussion to the issues of call dropping and connection continuity in order to minimize the dimensionality of the problem. termination due to handover calls is more annoying than blocking of a new call, therefore, protecting the connection continuity for mobile users, as a QoS constraint, has been studied extensively. Basic techniques to this protection are guard channel (GC) [1], handoff queuing [2], [3], and predictive channel reservation (PCR) [4], [5]. Other techniques for handoff protection include subrating [6], channel sharing [7], and channel carrying [8]. Indeed, the final goal of these schemes is to increase the connection continuity for an admitted call [9]. It has been declared in [9] that all of the three priority- based handoff protection schemes that are discussed frequently in the literature - GC, handoff queuing, and PCR - result in decreased handover failures but increased new call blocking. In other words, system capacity and QoS are two conflicting objectives and tradeoff is inevitable. Some researchers have investigated the possibility of minimizing new call blocking while providing handoff protection. In [10], Oh and Tcha have proposed careful division of nominal channels into guard and nonguard sets so that handoff failure is reduced within the constraint of satisfying a predefined grade of service. Minor changes such as adding or removing one guarded channel affect the new user admission and handoff protection performance significantly. Therefore, the use of fractional guard channel [11] permits fine adjustment by setting aside a noninteger number of guarded channels. The dynamic channel allocation scheme in [12] permits guarded channels to be provisionally accessed by new users if the number of handoff requests is small. In [13], channels in each cell are divided into two parts. To increase the channel utilization while maintaining QoS of each type for traffic, handoff calls are allowed to borrow channels from the other under certain constraints. In this paper, we propose and analyze a different handoff scheme which not only gives priority to handoff calls, due to importance of them from QoS standpoint, but also protects originating calls. The scheme is a composition of GC and PCR. In order to make prioritization on handoff calls, we use PCR technique and in contrast, to protect originating calls, we set an upper limit on reserved channels, denoted in this paper by NG. It is obvious that increasing the upper limit on reserved channels protects handoff calls better and in contrast Channel Management Based on Maximizing Customers' Satisfaction and Service Providers' Revenue S. Ali. A. Fakoorian, Hassan Taheri and Mohammad Fathi Department of Electrical Engineering Amirkabir University of Technology, Tehran, Iran fakoorian@ieee.org htaheri@aut.ac.ir 702 978-1-4244-1653-0/08/$25.00 ©2008 IEEE Downloaded from https://iranpaper.ir https://www.tarjomano.com/order