Capacity Design and Performance of Call Admission Control in Cellular CDMA Systems
Capacity Design and Performance of Call Admission Control in Cellular CDMA Systems
复制标题
蜂窝CDMA系统中呼叫准入控制的容量设计和性能
DOI：
10.1109/49.634800
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
N. Umeda
中科院分区：
文献类型：
--
作者：
Y. Ishikawa;N. Umeda
由于码分多址（CDMA）的容量受到干扰的限制，因此呼叫接纳控制（CAC）必须同时保证服务等级（GoS），即阻塞率和服务质量（QoS），即通信质量的损失概率。本文描述了基于这两个概念的一种新的容量设计方法的发展。首先从流量理论的角度推导了GoS和QoS作为流量强度和CAC阈值函数的理论表达式，然后给出了利用这些表达式的设计方法。此时，假设了两种CAC策略。一种是基于用户数，另一种是基于干扰程度。计算机仿真结果有力地支持了所提出的设计方法。此外，给出了考虑不同传播参数、非均匀流量分布和不同传输速率的两种策略的数值算例和性能比较。
Since code-division multiple-access (CDMA) capacity is interference limited, call admission control (CAC) must guarantee both a grade of service (GoS), i.e., the blocking rate, and a quality of service (QoS), i.e., the loss probability of communication quality. This paper describes the development of a new capacity design method based on these two concepts. Theoretical expressions for GoS and QoS as functions of traffic intensity and CAC thresholds are first derived from the traffic theory viewpoint, and then a design method using these expressions is presented. At that time, two strategies for CAC are assumed. One is based on the number of users, and the other is based on the interference level. Computer simulation results are presented that strongly support the proposed design method. Furthermore, numerical examples and a performance comparison of the two strategies considering various propagation parameters, nonuniform traffic distributions, and various transmission rates are shown.