School of Specs 23.501v20.2.0

3GPP 23.501 v20.2.0 — the document's own text

5.37.1 General

Taught in 23. Very fast, very reliable, very picky (The 5G system architecture, in depth).

This clause provides an overview of 5GS functionalities for support of XR services (AR/VR applications) and interactive media services that require high data rate and low latency communication, e.g. cloud gaming and tactile/multi-modal communication services according to service requirements documented in TS 22.261 [2]. The standardized 5QI characteristics for such interactive services are provided in Table 5.7.4-1 and TSCAI is used to describe the related traffic characteristics as defined in clause 5.27.2. Further enhancements for these interactive media services are as follows:

  • The 5GS may support QoS policy control for multi-modal traffic, see clause 5.37.2.
  • The 5GS may support network information exposure which can be based on ECN markings for L4S, see clause 5.37.3 or 5GS exposure API, see clause 5.37.4.
  • The 5GS may support PDU Set based Handling, see clause 5.37.5.
  • The 5GS may ensure that the UL and DL packets together meet the requested round trip delay and also update the delay for UL and DL considering QoS monitoring results, see clause 5.37.6.
  • The 5GS may perform per-flow Packet Delay Variation (PDV) monitoring and policy control according to AF provided requirements, see clause 5.37.7.
  • The 5GC may provide traffic assistance information to the NG-RAN to enable Connected mode DRX power saving, see clause 5.37.8.
  • The 5GS may consider dynamically changed traffic characteristics for better resource management, see clause 5.37.10.
  • The 5GS may support traffic identification for multiplexed media flows in the same transport layer connection, see clause 5.37.11.
  • The 5GC may perform PDU Set Importance based transport level packet marking, see clause 5.8.2.7.
  • The 5GC may provide the Multi-modal Service ID to NG-RAN, see clause 5.37.2.
  • The 5GC may provide an RAN-Controlled UL Bitrate Recommendation indication to the NG-RAN for a QoS Flow, see clause 5.37.12.

NOTE: Home-routed roaming deployments cannot always support the low latency communication requirements of XR services or interactive media services.