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Electronics and Telecommunications Research Institute (한국전자통신연구원)
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ZEUS: Handover algorithm for 5G to achieve zero handover failure

  • Park, Hyun-Seo (Mobile Communication Research Division, Electronics and Telecommunications Research Institute) ;
  • Lee, Yuro (Mobile Communication Research Division, Electronics and Telecommunications Research Institute) ;
  • Kim, Tae-Joong (Mobile Communication Research Division, Electronics and Telecommunications Research Institute) ;
  • Kim, Byung-Chul (Department of Radio and Information Communications Engineering, Chungnam National University) ;
  • Lee, Jae-Yong (Department of Radio and Information Communications Engineering, Chungnam National University)
  • Received : 2020.09.14
  • Accepted : 2021.10.12
  • Published : 2022.06.10
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Abstract

In 5G, the required target for interruption time during a handover (HO) is 0 ms. However, when a handover failure (HOF) occurs, the interruption time increases significantly to more than hundreds of milliseconds. Therefore, to fulfill the requirement in as many scenarios as possible, we need to minimize HOF rate as close to zero as possible. 3GPP has recently introduced conditional HO (CHO) to improve mobility robustness. In this study, we propose "ZEro handover failure with Unforced and automatic time-to-execute Scaling" (ZEUS) algorithm to optimize HO parameters easily in the CHO. Analysis and simulation results demonstrate that ZEUS can achieve a zero HOF rate without increasing the ping-pong rate. These two metrics are typically used to assess an HO algorithm because there is a tradeoff between them. With the introduction of the CHO, which solves the tradeoff, only these two metrics are insufficient anymore. Therefore, to evaluate the optimality of an HO algorithm, we define a new integrated HO performance metric, mobility-aware average effective spectral efficiency (MASE). The simulation results show that ZEUS provides higher MASE than LTE and other CHO variants.

Keywords

Acknowledgement

The authors especially thank Karthik Vasudeva, _ Ismail Guvenc, and David Lopez Perez, for their previous works and valuable discussions on the theoretical analysis of the HO performance. This research was supported by "The Cross-Ministry Giga KOREA Project" grant funded by the Korea government (MSIT) (no. GK20P0500, Development of Ultra Low-Latency Radio Access Technologies for 5G URLLC Service).

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