System capacity and Grade of Service (GOS) are both important for the rapid growth of cellular communication services. In this paper, we propose a two-tier cellular system with Macrocell overlaid on Microcell clusters. By implementing Fixed Channel Assignment (FCA) scheme and Fixed Reuse Partition (FRP) scheme in Microcell layer and Macrocell layer respectively, improvement can be achieved in both the system capacity and the GOS. Simulation results, obtaining from the overlay scheme with and without overflow, show that the performance of the call blocking probability, the call dropping probability and the handoff activity of such a system can be greatly improved compared with one-tier cellular system deployed with FCA or FRP schemes. Also, a theoretical analysis based on the overlay scheme without overflow and prioritized handoff procedure was presented and verified with the simulation results.
系统容量和服务等级(GOS)对于蜂窝通信服务的快速增长都很重要。在本文中,我们提出了一种双层蜂窝系统,宏小区覆盖在微小区集群上。通过分别实施微小区层和Macrocell层中的固定信道分配(FCA)方案和固定的再利用分区(FRP)方案,可以在系统容量和GOS中实现改进。与覆盖方案的仿真结果,在没有溢出的情况下获得呼叫阻塞概率的性能,与部署的单层蜂窝系统相比,可以大大提高呼叫阻止概率,呼叫丢失概率和这种系统的切换活动,或者与FCA部署的单层蜂窝系统相比FRP方案。此外,通过模拟结果提出并验证了基于没有溢出和优先级切换过程的覆盖方案的理论分析。 p>
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