论文标题
灵活的多个访问实现低延迟通信：引入Noma-R
Flexible Multiple Access Enabling Low-Latency Communications: Introducing NOMA-R
论文作者
论文摘要
5G及以后（B5G）网络中的各种垂直行业都需要非常严格的延迟保证，同时又设想了巨大的连接性。结果，选择最佳的多重访问（MA）技术来达到低潜伏期是B5G的关键推动力。特别是，由于潜在的碰撞数量可能很高，因此在上行链路传输中，此问题更加急剧。在此前提下，在目前的贡献中，我们使用优化的MA技术讨论了延迟敏感的上行链路连接的问题。为此，我们对可实现的有效能力（EC）进行了各种MA方法的比较分析。与标准率（PHY）或吞吐量（MAC）分析相反，我们提出了有效容量作为合适的指标的概念，用于表征共同的PHY-MAC层延迟。研究的MA方法的调色板包括在上行链路场景中的标准正交MA（OMA）和功率域非正交MA（NOMA），既考虑随机配对和优化配对替代方案。它进一步扩展到最近提出的第三个替代方案，称为Noma-Relevant（Noma-R），该替代方法通过灵活地选择MA技术来扩展OMA和NOMA方法。我们表明，优化用户配对和MA选择会增加网络EC，尤其是在实施严格的延迟约束时；因此，灵活的MA是未来低潜伏期应用的潜在优选策略
Various verticals in 5G and beyond (B5G) networks require very stringent latency guarantees, while at the same time envisioning massive connectivity. As a result, choosing the optimal multiple access (MA) technique to achieve low latency is a key enabler of B5G. In particular, this issue is more acute in uplink transmissions due to the potentially high number of collisions. On this premise, in the present contribution we discuss the issue of delay-sensitive uplink connectivity using optimized MA techniques; to this end, we perform a comparative analysis of various MA approaches with respect to the achievable effective capacity (EC). As opposed to standard rate (PHY) or throughput (MAC) analyses, we propose the concept of the effective capacity as a suitable metric for characterizing jointly PHY-MAC layer delays. The palette of investigated MA approaches includes standard orthogonal MA (OMA) and power domain non orthogonal MA (NOMA) in uplink scenarios, both considering random pairing and optimized pairing alternatives. It further extends to encompass a recently proposed third alternative, referred to as NOMA-Relevant (NOMA-R), which extends OMA and NOMA approaches by flexibly selecting the MA technique. We show that optimizing both user pairing and MA selection increases the network EC, especially when stringent delay constraints are in place; thus a flexible MA is a potentially preferable strategy for future low latency applications
