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在平流层的环境中,高空平台(HAPS)的扰动特性严重影响了通信系统的小区切换性能。在平台扰动和终端移动的场景中,基于固定门限的切换算法容易增加不必要的切换次数,切换性能较差。建立HAPS覆盖模型,用户终端根据其速度动态选择切换检测周期,提出基于接收信号强度差分最小均方预测的自适应切换算法,推导了无线链路失败率的上限。仿真结果表明,相比传统固定门限的切换算法,本文算法有效降低了不必要的切换,同时还可将无线链路失败率控制在1%以下,能够适应多种通信场景。
In the stratosphere environment, the disturbance characteristics of the high altitude platform (HAPS) seriously affect the cell handover performance of the communication system. In the scene of platform disturbance and terminal movement, the switching algorithm based on fixed threshold tends to increase unnecessary switching times and switch performance is poor. The HAPS coverage model is established. The user terminal dynamically selects the handover detection period according to its speed, and proposes an adaptive handover algorithm based on the least square estimation of the received signal strength difference. The upper bound of the failure rate of the radio link is deduced. The simulation results show that compared with the traditional fixed-threshold switching algorithm, the proposed algorithm can effectively reduce unnecessary switching, and can also control the failure rate of the wireless link below 1%, and can adapt to a variety of communication scenarios.