GJR2391700R0200 88TB03D ABB通用输入模块

　　urllc 一直是 5gs 进入各个垂直领域的关键推动力。rel-15 奠定了坚实的基础，rel-16 引入了 3gpp 的系统架构 (sa) 和 ran 组的进一步增强，以更好地服务于工厂自动化、运输业和电力分配等各种垂直行业。这些增强功能包括各种用户平面冗余方案以及提高可靠性、减少延迟和支持时间敏感通信 (tsc) 的增强功能。

　　rel-17 中的增强功能旨在提高频谱效率和系统容量，支持未许可频谱环境中的 urllc，并加强支持 tsc 的框架。它们包括混合自动重复请求确认 (harq-ack) 增强、csi 增强、ue 内复用、时间同步增强和作为 tsc 辅助信息扩展的服务生存时间。

　　nr 覆盖范围

　　覆盖对服务质量、运营支出和资本支出的直接影响使其成为商业化和竞争的关键因素。在 rel-17 中，3gpp 已将 pusch 确定为潜在的覆盖瓶颈。为了提高 pusch 覆盖范围，3gpp 正在考虑重复机制并支持多时隙上的传输块处理。此外，rel-17 规定了支持跨 pusch 重复的解调参考信号 (dmrs) 捆绑以及对动态 pucch 重复因子指示的信令支持的机制。

　　小数据传输

　　为了支持节能连接建立，现有的 nr rrc 非活动模式使 ue 能够恢复先前建立的 rrc 连接。为了进一步提高系统接入时的 ue 功耗，rel-17 规定支持 rrc 非活动模式下的数据传输。不必恢复 rrc 连接可减少控制平面信令开销，这对于支持以不频繁和小数据传输为特征的流量的低功耗设备尤其重要。

　　在 rel-16 中，3gpp 了对非公共网络 (npn) 的支持，该网络提供仅限于特定用户组的访问，例如属于给定工厂的设备。为了提供对工业垂直领域的全面支持，3gpp 了对两个 npn 部署选项的支持。个称为公共网络集成 npn，允许公共运营商通过将 npn 直接关联到其网络来支持 npn。第二种部署选项称为独立 npn (snpn)。从广义上讲，snpn 具有与常规公共网络相同的功能和特性。

　　3gpp 在 rel-17 中为 snpn 提供了进一步的增强。这些增强功能包括支持 ue 使用外部凭证访问 snpn（例如来自公共网络的凭证或属于另一个 snpn 的凭证）、snpn ue 入职（例如，为 ue 提供新的 npn 凭证和/或订阅参数）以及对紧急服务的支持。

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　　urllc has been a key enabler for the 5gs to enter various verticals. rel-15 established a solid foundation, and rel-16 introduced further enhancements by the 3gpp’s system architecture (sa) and ran groups to better serve various industry verticals such as factory automation, the transport industry and electrical power distribution. these enhancements included various user-plane redundancy schemes as well as enhancements to improve reliability, reduce latency and support time-sensitive communication (tsc).

　　the enhancements in rel-17 aim to improve spectral efficiency and system capacity, support urllc in unlicensed spectrum environments and strengthen the framework to support tsc. they include hybrid automatic repeat request-acknowledgement (harq-ack) enhancements, csi enhancements, intra-ue multiplexing, time-synchronization enhancements and service survival time as an extension to tsc assistance information.

　　nr coverage

　　the direct impact that coverage has on service quality, opex and capex makes it a key factor for both commercialization and competition. in rel-17, the 3gpp has identified the pusch as a potential coverage bottleneck. to improve pusch coverage, the 3gpp is considering mechanisms for repetition and support for transport block processing over multiple slots. moreover, rel-17 specifies mechanisms to support demodulation reference signal (dmrs) bundling across pusch repetitions and signaling support for dynamic pucch repetition factor indication.

　　small data transmission

　　to support power-efficient connection establishment, the existing nr rrc inactive mode enables a ue to resume a previously established rrc connection. to further enhance the ue power consumption at system access, rel-17 specifies support for data transmission in rrc inactive mode. not having to resume an rrc connection reduces the control plane signaling overhead, which is especially relevant for low-power devices that support traffic characterized by infrequent and small data transmissions.

　　non-public networks

　　in rel-16, the 3gpp specified support for non-public networks (npns), which provide access that is limited to a certain group of users such as the devices belonging to a given factory. to provide full support for industrial verticals, the 3gpp specified support for two npn deployment options. the first, known as public-network-integrated npns, allows public operators to support npns by associating them directly to their networks. the second deployment option is known as standalone npn (snpn). broadly speaking, an snpn has the same functionality and characteristics as a regular public network.

　　the 3gpp provides further enhancements for snpns in rel-17. these enhancements include support for a ue accessing an snpn using external credentials (such as those from a public network or those belonging to another snpn), snpn ue onboarding (to provision the ue with new npn credentials and/or subion parameters, for example) and support for emergency services.