Content for TR 23.725 Word version: 16.2.0
1 Scope
2 References
3 Definitions and abbreviations
3.1 Definitions
3.2 Abbreviations
4 Architecture Assumptions
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1 Scope p. 8
The objective of this Technical Report is to study and perform an evaluation of potential architecture enhancements for supporting URLLC services in 5G System (5GS). Specifically, the following aspects are covered:
- Investigate the key issues for meeting the URLLC requirements on latency, jitter and reliability in 5G System as defined in TS 22.261.
- Study how to minimize the impacts of UE mobility to the latency and jitter between AN and CN, and within CN.
- Study how to realize transmission with reliability higher than the reliabilities of single user plane tunnel of N3 and N9 and NFs in the user plane path.
- Study how to monitor the QoS of the QoS flow with URLLC requirement.
- Study potential impacts to charging and policy control.
2 References p. 8
The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
- References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
- For a specific reference, subsequent revisions do not apply.
- For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]
TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
TS 23.501: "System Architecture for the 5G System".
[3]
TS 23.502: "Procedures for the 5G System".
[4]
TS 23.503: "Policy and Charging Control Framework for the 5G System".
[5]
TS 22.261: "Service requirements for the 5G system".
[6]
IEEE 802.1CB-2017: IEEE Standard for Local and metropolitan area networks--Frame Replication and Elimination for Reliability, https://ieeexplore.ieee.org/document/8091139/.
[7]
TS 37.340: "Evolved Universal Terrestrial Radio Access (E-UTRA) and NR; Multi-connectivity".
[8]
ETSI GS MEC 003: "Mobile Edge Computing (MEC); Framework and Reference Architecture".
[9]
draft-ietf-detnet-architecture-06 (June 2018): "Deterministic Networking Architecture".
[10]
IEEE 802.1Q: "IEEE Standard for Local and metropolitan area networks -- Bridges and Bridged Networks".
[11]
TS 38.300: "NR; NR and NG-RAN Overall Description; Stage 2".
[12]
TS 38.420: "NG-RAN; Xn general aspects and principles".
[13]
TS 38.415: "NG-RAN; PDU Session User Plane protocol".
[14]
TS 23.734: "Study on 5GS Enhanced support of Vertical and LAN Services".
[15]
TS 28.552: "Management and orchestration; 5G performance measurements".
[16]
TS 23.288: "Architecture enhancements for 5G System (5GS) to support network data analytics services".
[17]
TS 29.281: "General Packet Radio System (GPRS) Tunnelling Protocol User Plane (GTPv1-U)".
3 Definitions and abbreviations p. 9
3.1 Definitions p. 9
For the purposes of the present document, the terms and definitions given in TR 21.905 apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.
3.2 Abbreviations p. 9
For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
C-TAG
Customer VLAN Tag
CU
Central Unit
DC
Dual Connectivity
DU
Distributed Unit
EDT
Early Data Transmission
FRER
Frame Replication and Elimination for Reliability
GARP
Gratuitous ARP
HRP
High Reliability Protocol
LLC
Low Latency Communication
MCG
Master Cell Group
MgNB
Master gNB
MO
Mobile Originated
M-RAN
Master RAN
MT
Mobile Terminated
NDP
Neighbor Discovery Protocol
NRG
Network Reliability Group
PDB
Packet Delay Budget
PDCP
Packet Data Convergence Protocol
QMP
QoS Monitoring Packet
RFSP
RAT/Frequency Selection Priority
RG
Reliability Group
RHF
Redundancy Handling Function
RNA
RAN Notification Area
RSN
Redundancy Sequence Number
RTT
Round-trip Time
SCG
Secondary Cell Group
SgNB
Secondary gNB
S-RAN
Secondary RAN
S-TAG
Service VLAN Tag
STP
Spanning Tree Protocol
TSN
Time Sensitive Network
URLLC
Ultra-Reliable and Low Latency Communication
URR
Usage Reporting
4 Architecture Assumptions p. 9
The following architectural assumptions are applicable for all potential solutions:
- The 5GS defined in TS 23.501 is used as the baseline network architecture for URLLC.
- For QoS flows with low latency requirement, at least one user plane path between the application and UE that be able to satisfy the requirement for latency should exist in the network.
- For QoS flows with ultra-high reliability requirement, there is no assumption on whether each NF or connection segment is able to meet the reliability requirements.
