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full Contents for  TS 23.501  Word version:   16.4.0

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4.4.8  Time Sensitive Communication [R16]Word-p. 70
4.4.8.1  General
The 5G System is extended to support Time sensitive communication as defined in IEEE P802.1Qcc [95].
In this Release of the specification, integration of 5G System with TSN networks that are based on IEEE TSN (IEEE P802.1Qcc [95]) is supported. IEEE TSN is a set of standards to define mechanisms for the time-sensitive (i.e. deterministic) transmission of data over Ethernet networks.
4.4.8.2  Architecture to support Time Sensitive Communication
The 5G System is integrated with the external network as a TSN bridge. This "logical" TSN bridge (see Figure 4.4.8.2-1) includes TSN Translator functionality for interoperation between TSN System and 5G System both for user plane and control plane. 5GS TSN translator functionality consists of Device-side TSN translator (DS-TT) and Network-side TSN translator (NW-TT). 5G System specific procedures in 5GC and RAN, wireless communication links, etc. remain hidden from the TSN network. To achieve such transparency to the TSN network and the 5GS to appear as any other TSN Bridge, the 5GS provides TSN ingress and egress ports via DS-TT and NW-TT. DS-TT and NW-TT optionally support:
  • hold and forward functionality for the purpose of de-jittering;
  • per-stream filtering and policing as defined in IEEE 802.1Q [98] clause 8.6.5.1.
DS-TT optionally supports link layer connectivity discovery and reporting as defined in IEEE 802.1AB [97] for discovery of Ethernet devices attached to DS-TT. NW-TT supports link layer connectivity discovery and reporting as defined in IEEE 802.1AB [97] for discovery of Ethernet devices attached to NW-TT. If a DS-TT does not support link layer connectivity discovery and reporting, then NW-TT performs link layer connectivity discovery and reporting as defined in IEEE 802.1AB [97] for discovery of Ethernet devices attached to DS-TT on behalf of DS-TT.
NOTE 1:
If NW-TT performs link layer connectivity discovery and reporting on behalf of DS-TT, it is assumed that LLDP frames are transmitted between NW-TT and UE on the default QoS Flow. Alternatively, SMF can establish a dedicated QoS Flow matching on the Ethertype defined for LLDP (IEEE 802.1AB [97]).
There are three TSN configuration models defined in IEEE P802.1Qcc [95]. Amongst the three models:
  • fully centralized model is supported in this release of the specification;
  • fully distributed model is not supported in this release of the specification;
  • hybrid model is not supported in this Release of the specification.
NOTE 2:
This release only supports interworking with TSN using IEEE 802.1Q [98] clause 8.6.8.4 based scheduled traffic and IEEE 802.1Q [98] clause 8.6.5.1 based per-stream filtering and policy.
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NOTE 3:
Whether DS-TT and UE are combined or are separate is up to implementation.

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