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TIME SENSITIVE COMMUNICATION QOS

TSC Assistance Information (TSCAI) describes traffic characteristics Flow Direction, Survival Time and Time domain to the NEF. The NEF
that may be provided for use by the gNB, to allow more efficiently forwards the received traffic pattern parameters to TSCTSF.
scheduled radio resources for periodic traffic and applying to PDU
session type Ethernet and IP. The AF trusted by the operator can be allowed to provide such traffic
pattern parameters to TSCTSF directly. The TSCTSF is responsible for
TSCAI describes TSC traffic characteristics for use in the 5G System. determining and forwarding these traffic pattern parameters in TSC
The knowledge of TSC traffic pattern is useful for 5G-AN to allow it Assistance Container to the SMF (via PCF).
to more efficiently schedule periodic and deterministic traffic flows
either via Configured Grants, Semi-Persistent Scheduling or with Survival Time was also introduced as part of TSCAI in order for the
Dynamic Grants. AF to provide the time period an application can survive without
any burst. It refers to the time that an application consuming
5GS determines TSC Assistance Container based on information a communication service may continue without an anticipated
provided by an AF/NEF and may provide it to PCF for IP type and message. Maximum number of messages (message is equivalent to
Ethernet type PDU sessions. a burst) or in terms of time units. Single burst is expected within a
single time period referred to as the periodicity.
The AF may provide the traffic pattern parameters such as Burst
Arrival Time with reference to the ingress port, Periodicity,
TSC Assistance Information (TSCAI)

Assistance Information Description
Flow Direction The direction of the TSC flow (uplink or downlink).
Periodicity It refers to the time period between start of two bursts.
The latest possible time when the first packet of the data burst arrives at either
Burst Arrival time the ingress of the RAN (downlink flow direction) or egress interface of the UE
(uplink flow direction).
Burst Arrival time Survival Time, as defined in TS 22.261 [2], is synonymous with the time period
an application can survive without any burst.

References
• 3GPP TS 23.501, System Architecture for 5G System; Stage 2 (clauses 4.4.8, 5.27, 5.28)
• 3GPP TS 23.502, Procedures for 5G System; Stage 2
• 3GPP TS 23.503, Policy and Charging Control Framework for the 5G System; Stage 2

• For details of the IEEE work, go to: https://1.ieee802.org/

Editor’s note: Devaki Chandramouli was presented with the 3GPP Excellence Award for her outstanding contribution to WG SA2 work on
the 5G System Architecture and Industrial IoT in 2020.

ACRONYMS

5G-AN 5G Access Network PLMN Public Land Mobile Network
5G GM Grand Master PTP Precision Time Protocol
5GS 5G System RAN Radio Access Network
AF Analytics Function SA2 Service and System Aspects WG2 (3GPP)
CAG Closed Access Group SMF Session Management Function
DS-TT Device-Side TSN Translator SMPTE Society of Motion Picture and Television Engineers
gNB Next generation NodeB SNPN Stand-alone Non-Public Network
gPTP generalized Precision Time Protocol TSC Time Sensitive Communication
IEEE Institute of Electrical and Electronics Engineers TSCAI Time Sensitive Communication Assistance Information
LAN Local Area Network TSF Time Synchronization Function
NEF Network Exposure Function TSN Time Sensitive Networking
NG RAN Next Generation Radio Access Networks UE User Equipment
NID Network identifier UPF User Plane Function
NW-TT Network-Side TSN Translator VN Virtual Network
PCF Policy Control Function
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