Multicast and broadcast transmissions enhance the spectrum efficiency by delivering a single packet to multiple terminal users. The service continuity (SC) mechanism enables users to continue the service reception when the original transmission is not available anymore. For multicast and broadcast transmissions, the SC mechanism is different from that of unicast because of the different reception conditions. We design and analyze a set of SC mechanisms for New Radio (NR) multicast and broadcast transmissions (MBS) in this paper. The designed SC mechanisms do not require extra data-forwarding resources while meeting the interruption time requirements of diverse applications. To minimize the signalling overhead while meeting the latency requirements, we propose a dynamic SC configuration framework. With the framework, the network condition information is collected and the most suitable SC mechanism is chosen with its parameters. Simulation results demonstrate that the proposed dynamic configuration framework outperforms the LTE eMBMS solution with up to 84.07% signaling overhead reduction, facilitating a more efficient multicast and broadcast system in NR.

中文翻译：

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通过灵活的服务连续性配置增强 5G NR 组播和广播 QoS


组播和广播传输通过向多个终端用户传送单个数据包来提高频谱效率。服务连续性（SC）机制使得用户能够在原始传输不再可用时继续接收服务。对于多播和广播传输，由于接收条件不同，SC 机制与单播不同。在本文中，我们设计并分析了一套用于新无线电（NR）多播和广播传输（MBS）的 SC 机制。所设计的SC机制不需要额外的数据转发资源，同时满足各种应用的中断时间要求。为了在满足延迟要求的同时最大限度地减少信令开销，我们提出了一种动态 SC 配置框架。通过该框架，收集网络状况信息，并根据其参数选择最合适的 SC 机制。仿真结果表明，所提出的动态配置框架优于 LTE eMBMS 解决方案，信令开销减少高达 84.07%，有助于在 NR 中实现更高效的多播和广播系统。