Multi-connectivity with packet duplication, where the same data packet is duplicated and transmitted from multiple transmitters, is proposed in 5G New Radio as a reliability enhancement feature. This paper presents an analytical study of the outage probability enhancement with multi-connectivity, and analyses its cost in terms of resource usage. The performance analysis is further compared against conventional single-connectivity transmission. Our analysis shows that, for transmission with a given block error rate target, multi-connectivity results in more than an order of magnitude outage probability improvement over the baseline single-connectivity scheme. However, such gains are achieved at the cost of almost doubling the amount of radio resources used. Multi-connectivity should thus be selectively used such that its benefits can be harnessed for critical users, while the price to pay in terms of resource utilization is simultaneously minimized.
翻译：在5G新空口中，提出了采用数据包复制的多连接技术，即同一数据包被复制后从多个发射端同时传输，作为一项提升可靠性的关键特性。本文通过解析方法研究了多连接技术对中断概率的改善效果，并从资源占用的角度分析了其代价。进一步将性能分析与传统的单连接传输进行了对比。我们的分析表明，在给定误块率目标的传输条件下，多连接方案相比基线单连接方案，能够将中断概率降低一个数量级以上。然而，这一增益的获取是以近乎翻倍的无线资源消耗为代价的。因此，多连接技术应被选择性应用，以便在关键用户上充分发挥其优势，同时尽可能降低资源利用方面的开销。
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