环形小区在高空平台通信系统中的应用

Application of ring-shaped cells in HAP communication system

受风力等因素影响高空平台(HAP)仅能维持在一种准静止状态,旋转是HAP摄动的重要一种。采用常规的蜂窝网络时,平台旋转会造成大量用户链路的频繁切换,严重影响通信性能。而环形小区可以有效地解决由于平台旋转造成的通信切换问题。本文通过仿真分析了平台旋转对高空平台通信系统性能的影响,提出采用环形小区的必要性,并对HAP的环形小区覆盖方案和复用方式进行了设计,同时研究了环形小区的实现方式,对垂向阵列天线产生环形小区进行了仿真,仿真结果验证了环形小区实现的可行性。

Affected by wind and other factors,the high altitude platform（HAP）can only be maintained in a quasistationary state.The rotation of the HAP around its central axis is a major problem.When using the classical honey cells,frequent handoff caused by platform rotation will happen especially for outer cells,which will seriously deteriorate the communication performance.An effective method to overcome this problem is to use the ring shaped cells.In the paper,the influence of platform rotation in the HAP communication system is analyzed to prove the necessary of using the ring cells.And then the configuration and multiplexing mode based on the ring cells is proposed for the HAP system.Finally,the realization of ring shaped beam by vertical antenna array is studied and simulated to prove the feasibility of the ring shaped cell.