Physical Layer Enhancements for High-Reliability Multicast and Broadcast Services in 5G Release-17

IEEE Communications Standards Magazine Pub Date : 2024-03-01 DOI:10.1109/MCOMSTD.0002.2200051

Athul Prasad, Baran Elmali, Volker Pauli, Naizheng Zheng, David Bhatoolaul

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Abstract

The exponential growth of the demand for higher data rates has motivated the 5G ecosystem to continually evolve and add new features to the system. 3GPP enhanced Release-17 specifications in order to add new capabilities to 5G that will address new services and verticals. One of the key enhancements currently being done relates to the support for multicast/broadcast, or point-to-multipoint (PTM) transmissions, with a key focus on enhanced reliability. These new features are targeting a wide variety of use cases ranging from network-to-vehicle communication to immersive multimedia content delivery. In this work, we present some of the key physical layer procedures and enhancements that were standardized to support the group scheduling of users for multicast traffic with near-unicast level of reliability, as well as support for idle/inactive users to receive broadcast traffic. We also present some performance results, which validate the need to support NACK-only HARQ feedback for multicast which provides significantly improved radio resource efficiencies for uplink feedback, with comparable performance as currently defined ACK/NACK feedback.

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针对 5G Release-17 中高可靠性组播和广播服务的物理层增强功能

对更高数据速率的需求呈指数级增长，这促使 5G 生态系统不断发展并为系统增加新功能。3GPP 增强了 Release-17 规范，以便为 5G 增加新的功能，满足新服务和垂直行业的需求。目前正在进行的主要增强功能之一是支持多播/广播或点对多点（PTM）传输，重点是增强可靠性。这些新功能针对的是从网络到车辆通信到身临其境的多媒体内容传输等各种用例。在这项工作中，我们介绍了一些关键的物理层程序和增强功能，这些程序和增强功能已标准化，可支持用户分组调度，以近乎单播级别的可靠性进行组播流量，并支持空闲/不活动用户接收广播流量。我们还介绍了一些性能结果，这些结果验证了为组播支持仅 NACK HARQ 反馈的必要性，该反馈可显著提高上行链路反馈的无线电资源效率，其性能与当前定义的 ACK/NACK 反馈相当。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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IEEE Communications Standards Magazine

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