| Citation: | HE Panfeng, CHENG Naiping, NI Shuyanet al. Cell handover algorithm based on prediction in HAPS communication system[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(3): 551-558. doi: 10.13700/j.bh.1001-5965.2016.0627(in Chinese)
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In the environment of stratosphere, the quasi-stationary characteristics of high altitude platform station (HAPS) seriously affect handover performance of the communication system. In the scenes of platform disturbance and mobility of terminal, the handover algorithm based on fixed thresholds is easy to increase the number of unnecessary handover and shows poor handover performance. HAPS coverage model was established, and the handover detection period can be changed with speed of user terminals. Then the adaptive handover algorithm was proposed to trigger handover based on signal strength, which is predicted by differential least mean square method. The upper limit of the radio link failure rates was also derived. The results of simulation indicate that compared with traditional fixed-threshold methods, the proposed algorithm effectively reduces the unnecessary handover, and keeps radio link failure rate under 1%, which makes it adaptable to a variety of communication scenarios.
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