Capacity enhancement and performance analysis of call admission and load control in wireless communication networks

This work focuses on the capacity enhancement and performance analysis of modern wireless cellular communication systems using efficient call admission and load control algorithms for single and multiple service. The proposed algorithms exploit the residual capacity to enhance the system performance.; Overlapping coverage in urban microcells is studied. Area Coverage Probability (ACP) is evaluated analytically and by simulation. The results show that the ACP is substantially improved by making use of overlapping coverage. A novel algorithm is proposed to enhance system capacity using overlapping coverage. Capacity enhancement is achieved by balancing the loading in the neighboring cells. Performance is evaluated analytically using Markovian analysis, namely, the Birth-Death model and by simulation as well. Then, it is compared with the non-overlapping coverage case and with overlapping coverage using a previous algorithm called directed retry. The results show that the proposed algorithm surpasses the directed retry and achieves a considerable capacity gain by reducing the blocking and dropping probabilities.; The capacity of Time Division Multiple Access (TDMA) networks with Slow Frequency Hopping (SFH) is determined analytically and by simulation. The soft capacity limit and the effect of admission control algorithms are investigated. The outage probability (P_out) as one of the measures of the Quality of Service (QoS) is derived as a function of the loading factor. Then, the network capacity is determined as a function of the maximum loading factor that keeps the outage probability below a certain threshold value. The capacity gain of switched-beam antennas and power control is evaluated. A novel call admission control algorithm is proposed. This algorithm enhances the network capacity by reducing the call blocking and dropping rates without causing any significant degradation in the QoS in terms of the outage probability.; An admission and load control algorithm is developed for multiple service in third generation wireless system. It is designed for a stream mode non-real-time data service such as File Transfer Protocol (FTP) applications taking the voice service into consideration. The algorithm takes advantage of the smart antennas and intermittent nature of the voice service. Furthermore, some features of third generation wireless systems such as the reported pilot measurements, auxiliary pilot for smart antennas and variable spreading gain are considered in the system model. The performance of the proposed algorithm is evaluated analytically using two-dimensional Markovian model and by simulation as well. The results show that a high transmission rate (more than 144 Kbps) can be achieved for vehicular data users without degrading the QoS of the voice service.