单天线覆盖弱场下终端Volte掉话率的优化

Optimization on VoLTE Call Dropping Rate for Terminals in the Single-Antenna Poor Coverage Area

在单天线覆盖弱场下很容易发现掉话问题。通过系统分析发现,主要原因是不满足S准则而终端下行无法同步到合适小区,既而导致掉话。但是在最低的最小接收功率时,多数终端还是有能力发起驻网请求,并完成重建。针对因为不满足S准则而引起的掉话,提出了优化方案,同时通过外场论证,此优化方案可以有效地改善VoLTE掉话率。

In the single-antenna poor coverage area, the call dropping issue occurs easily. Through systematic analysis, the main reason is that S criterion is not met and the terminals cannot be synchronized to a suitable cell in downlink, which causes the call dropping. However, it is still possible for most terminals to initiate a network access request and complete the reestablishment even with the lowest minimum received power. In this regard, an optimization solution is proposed for the call dropping issue caused by not meeting the S criterion. Meanwhile, the VoLTE dropping rate can be effectively improved by the proposed solution through the field demonstration.