一种多码CDMA分层小区模型的呼叫接纳性能分析

为研究第三代移动通信分层小区系统的呼叫接纳策略 ,提出了一种由宏小区层、微小区层和皮小区层构成的多码码分多址 (CDMA)系统分层小区模型。该模型中 ,皮小区层作为“热点”小区层嵌入微小区层 ,采用多码传输方案支持多类型和高速率业务。在分析上行链路干扰的基础上 ,兼顾移动性提出了一种分层小区系统的多业务呼叫接纳控制策略。仿真结果表明 ,多业务呼叫接纳策略优于固定门限呼叫接纳策略。最后得出了多业务呼叫接纳控制策略减少了呼叫业务的切换频度 ,降低了系统信令开销 ,具有良好呼叫接纳性能的结论。

Performance of a Hierarchical Cellular Model for Multi-Code CDMA Systems

This paper presents a hierarchical cellular model for multi code CDMA systems in an attempt to study call access control of hierarchical cellular systems. This model includes three layers as macro cell layer, micro cell layer and picro cell layer. Both macro cell layer and micro cell layer are continuously overlaid and the picro cell layer is embedded in micro cell layer as "hot spot" cell layer. Multi code transmission mode is used to support multi type and high rate services. On this basis, the uplink interference is analyzed and a multi service call access control strategy is proposed. The simulation shows that this strategy is superior to the fixed threshold access control strategy. The conclusion that the strategy presented in this paper decreases the handoff frequency and the system signaling load is reached.