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Many network applications, e.g., industrial control, demand Ultra-Low Latency(ULL). However, traditional packet networks can only reduce the end-to-endlatencies to the order of tens of milliseconds. The IEEE 802.1 Time SensitiveNetworking (TSN) standard and related research studies have sought to providelink layer support for ULL networking, while the emerging IETF DeterministicNetworking (DetNet) standards seek to provide the complementary network layerULL support. This article provides an up-to-date comprehensive survey of theIEEE TSN and IETF DetNet standards and the related research studies. The surveyof these standards and research studies is organized according to the maincategories of flow concept, flow synchronization, flow management, flowcontrol, and flow integrity. ULL networking mechanisms play a critical role inthe emerging fifth generation (5G) network access chain from wireless devicesvia access, backhaul, and core networks. We survey the studies thatspecifically target the support of ULL in 5G networks, with the main categoriesof fronthaul, backhaul, and network management. Throughout, we identify thepitfalls and limitations of the existing standards and research studies. Thissurvey can thus serve as a basis for the development of standards enhancementsand future ULL research studies that address the identified pitfalls andlimitations.

Ultra-Low Latency (ULL) Networks: The IEEE TSN and IETF DetNet Standards and Related 5G ULL Research