多业务蜂窝CDMA系统中的呼叫接纳控制策略
Call admission control scheme in multi-service cdma cellular systems
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摘要: 基于码分多址(CDMA)技术的第三代(3G)移动通信系统将支持多种业务传输,有效的呼叫接纳控制策略将使系统在满足各类业务不同QoS要求的同时,能够为更多的用户提供服务,该文首先分析了多业务蜂窝CDMA系统的剩余容量与QoS约束间的关系,接着提出了适用于任意多类业务环境、基于信号干扰比(SIR)测量的两种呼叫接纳控制策略,局部策略与全局策略,并通过大量计算机仿真研究了两种策略在业务均匀分布和非均匀分布环境下的性能,仿真结果表明,在两种业务分布情况下,全局策略的性能部优于局部策略。Abstract: The 3G mobile communication systems based on CDMA technique are expected to provide multi-services to mobile users. An efficient call admission control scheme is essential to provide QoS guarantees of different services to as many users as possible. This paper analyzes the relation between the system residual capacity and QoS constraints for a multi-service CDMA cellular system. Then the SIR-measurement-based local and global call admission control schemes for multi-services are proposed. The performances of the two schemes under both uniform and non-uniform traffic distribution environments are studied through extensive simulations. The simulation results show that global scheme outperforms the local scheme under both environments.
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Z. Liu, M. E. Zarki, SIR-based call admission control for DS-CDMA cellular systems, IEEE Journal on Selected Area of Communications, 1994, 12(4), 638-644.[2]I.M. Kim, B. C. Shin, D. J. Lee, SIR-based call admission control by intercell interference prediction for DS-CDMA cellular systems, IEEE Commun. Letters, 2000, 4(1), 29-31.[3]N. Dimitriou.[J].G. Sfikas, R. Tafazoli, Call admission policies for UMTS, IEEE Proc. of VTC2000,Tokyo, Japan.2000,:-[4]C.Y. Huang.[J].R. D. Yates, Call admission in power controlled CDMA systems, IEEE Proc. of VTC96, Atlanta, U.S.A.1996,:-[5]J. Kuri.[J].P. Mermelstein, Call admission on the uplink of a CDMA system based on total received power, IEEE Proc. of ICC99, Vancouver, Canada.1999,:-[6]K. Kin, Y. Han, A call admission control scheme for multi-rate traffic based on total received power, IEICE Trans. on Commun., 2001, E84-B(3), 457-463. -
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