Connection Admission Control Study In Wireless Communication Networks

Wireless resources, especially for spectrum resources, are scarce and valuable. So the wireless resource management and utilization are always the mainstream studies in wireless networks. Connection admission control (CAC) palys a key role in wireless resource utilization. In this dissertation, we shall study some key issues on connection admission control in wireless networks, such as system modeling, algorithm designing and performance assessing. By studying the CAC strategies, we shall discuss the tradeoff between quality of service (QoS) and resource utilization in wireless networks. Furthermore, we try to propose a general method for designing CAC strategies in wireless networks.In this dissertation, we follow two directions namely vertical and horizontal, to study the CAC technology. From the vertical direction, we focus on three topics, which are key parameters, key methods and key tools in designing CAC strategies. From the horizontal direction, we focus on two topis, which are CAC strategies in relay cellular networks and in wirless heterogeneous networks. In each topic, we shall firstly construct the nanalytical model of resource utilization. Then, based on the proposed model, we shall obtain the effective CAC strategies considering the tradeoff between resource utilization and QoS in wireless networks.The main contributions of the dissertation are as follows. We propose a new connection admission control algorithm called DAC for real-time services in packet-switched OFDM wireless cellular networks. We propose a joint admission control and bandwidth allocation scheme for packet-switched multiservices cellular networks. We propose a fuzzy logic based admission control scheme for packet-switched OFDM cellular networks. We develop an analytical model based on Markov chains for studying the handoff performance of the Integrated Cellular Ad hoc Relaying (iCAR) system. We propose a dynamic resource sharing strategy (DReSS) with service differentiation to call assignment and admission control (CAAC) in heterogeneous wireless networks. At last but not least, we abstract a general method for designing connetion admission control in wireless networks, which is called four-step method.