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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。
In order to study the call admission strategy of the third generation mobile communication hierarchical cell system, a multi-code division multiple access (CDMA) system hierarchical cell model composed of macrocell layer, microcell layer and picocell layer is proposed. In this model, the picocell layer is embedded as a “hot spot” cell layer into the microcell layer and adopts multi-code transmission scheme to support multi-type and high-rate services. Based on the analysis of the uplink interference and considering the mobility, a multi-service call admission control strategy of hierarchical cell system is proposed. The simulation results show that the multi-service call admission strategy is superior to the fixed threshold call admission strategy. At last, it concludes that the multi-service call admission control strategy reduces the switching frequency of the call service, reduces the system signaling overhead and has good call admission performance.