Sparse vector transmission (SVT) is a promising candidate technology for achieving ultra-reliable low-latency communication (URLLC). In this paper, a hierarchical SVT scheme is proposed for multi-user URLLC scenarios. The hierarchical SVT scheme partitions the transmitted bits into common and private parts. The common information is conveyed by the indices of non-zero sections in a sparse vector, while each user's private information is embedded into non-zero blocks with specific block lengths. At the receiver, the common bits are first recovered from the detected non-zero sections, followed by user-specific private bits decoding based on the corresponding non-zero block indices. Simulation results show the proposed scheme outperforms state-of-the-art SVT schemes in terms of block error rate.

翻译：稀疏向量传输（SVT）是实现超可靠低时延通信（URLLC）的一种极具前景的候选技术。本文针对多用户URLLC场景，提出了一种分层SVT方案。该分层SVT方案将待传输比特划分为公共部分和私有部分。公共信息通过稀疏向量中非零分段的索引来传递，而每个用户的私有信息则嵌入到具有特定块长度的非零块中。在接收端，首先从检测到的非零分段中恢复公共比特，随后根据相应的非零块索引解码用户特定的私有比特。仿真结果表明，所提方案在误块率性能上优于现有最先进的SVT方案。