Call routing and admission control for two-hop TDMA cellular system
Jingmei Zhang, Xiaodong Shen, Ying Wang, Ping Zhang · 2006
In future wireless communication systems, an architecture introducing wireless relaying technologies into the cellular infrastructure, seems a promising approach to enlarge the coverage area and enhance system capacity. How to design an efficient call admission control algorithm to perform routing and channel allocation for such integrated cellular system, and manage the radio resources effectively are the key issues to be studied. Based on time division multiple access (TDMA) scheme, this paper proposes a novel call routing and admission control (CRAC) algorithm for the two-hop cellular system with the aim of extending system coverage and increasing system capacity cost-effectively. With the proposed CRAC algorithm, a mobile terminal (MT) can choose the conventional direct link or opt for the relaying considering the transmission quality as well as the traffic load balance. The simulation results show that the CRAC algorithm can decrease the blocking probability significantly and increase the system capacity and enhance the coverage by utilizing the limited channel resource efficiently. Keywords-Relaying, Call routing and admission control (CRAC), Cellular