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

多播和广播传输通过将单个数据包传送给多个终端用户来提高频谱效率。服务连续性（SC）机制使用户能够在原始传输不再可用时继续服务接收。对于组播和广播传输，SC 机制与单播不同，因为接收条件不同。我们在本文中设计和分析了一套用于新无线电（NR）组播和广播传输（MBS）的SC机制。设计的 SC 机制不需要额外的数据转发资源，同时满足不同应用程序的中断时间要求。为了在满足延迟要求的同时最小化信令开销，我们提出了一个动态 SC 配置框架。有了框架，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 中实现更高效的组播和广播系统。