Specification
3GPP TS 23.502: Procedures for the 5G System (5GS); Stage 2
At a glance
- Title
- Procedures for the 5G System (5GS); Stage 2
- Newest version
- V20.3.0 (Rel-20)
- Versions indexed
- 9
- Newest per release
- Rel-16: V16.19.0 (2024-03-27); Rel-17: V17.15.0 (2025-12-19); Rel-18: V18.14.0 (2026-06-22); Rel-19: V19.9.0 (2026-09-24); Rel-20: V20.3.0 (2026-09-24)
In plain words
TS 23.502 defines Stage 2 procedures and Network Function Services for the 5G system architecture described in TS 23.501 and the policy and charging control framework described in TS 23.503. Clause 4 describes 5GS procedures and Network Function services "by end-to-end information flows". These information flows make use of Network Function (NF) service operations for communication within the 5GC Control Plane. V20.3.0 includes 17 CRs, with subjects including updates to SMF event for Redundant Transmission Experience analytics and correction for NSSF NSSAI Availability Notification.
Source: 3GPP TS 23.502 V20.3.0, clause 4.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/23_series/23.502/23502-k30.zip
Newest version in each release
| Release | Newest version | In the archive | TSG meeting |
|---|---|---|---|
| Rel-20 | V20.3.0 | 2026-09-24 | TSG SA #113 |
| Rel-19 | V19.9.0 | 2026-09-24 | TSG SA #113 |
| Rel-18 | V18.14.0 | 2026-06-22 | TSG SA #112 |
| Rel-17 | V17.15.0 | 2025-12-19 | TSG SA #110 |
| Rel-16 | V16.19.0 | 2024-03-27 | TSG SA #103 |
| Rel-15 | V15.17.0 | 2023-09-19 | TSG SA #101 |
Source: 3GPP specification archive, versions indexed by 3GPP Scout. Each version links its official file.
Change requests in V20.3.0
V20.3.0 of TS 23.502 includes 17 CRs. The first 12 by CR number are listed.
| CR | Category | Subject | Source | Working group meeting | TSG TDoc |
|---|---|---|---|---|---|
| CR 5766 rev 2 | A | Update to SMF event for Redundant Transmission Experience analytics | CATT, Huawei, HiSilicon | SA2 #176 | SP-260740 |
| CR 5773 | A | Correction for NSSF NSSAI Availability Notification | Oracle | SA2 #176 | SP-260740 |
| CR 5777 | B | Subscription Data Updates for UE Reader Authorization | Ericsson | SA2 #176 | SP-260746 |
| CR 5778 rev 2 | B | Updates to PDTQ and BDT services to support re-negotiation upon energy indicator change and add reason for re-negotiation. | Ericsson | SA2 #176 | SP-260747 |
| CR 5779 rev 2 | F | Clarification on AM Policy Association Termination | Ericsson | SA2 #176 | SP-260750 |
| CR 5780 | B | Adding ESI in the UDR Data Management service | Lenovo, Motorola Mobility UK Ltd. | SA2 #176 | SP-260747 |
| CR 5782 rev 3 | F | Clarification on PCF events in Nnef_AFsessionWithQoS service | Huawei, HiSilicon | SA2 #176 | SP-260750 |
| CR 5783 | F | Alignment of AF provided interest on low energy consumption | Huawei, HiSilicon | SA2 #176 | SP-260747 |
| CR 5785 rev 1 | A | Corrections to non-3GPP handover with EPS interworking for home-routed roaming scenarios | Ericsson | SA2 #176 | SP-260740 |
| CR 5786 rev 1 | B | NRF service update for DCSF registration and discovery | China Mobile | SA2 #176 | SP-260748 |
| CR 5790 rev 2 | F | Update on the energy related UE policy decision in the related procedure | Vivo, MediaTek Inc., China Telecom, CAICT, Lenovo | SA2 #176 | SP-260747 |
| CR 5792 rev 1 | A | Correction of mistakes for transfer of PDU Session Modification Command Ack | Huawei, HiSilicon | SA2 #176 | SP-260740 |
Source: 3GPP CR database.
Meetings behind the latest versions
Working group meetings that agreed the CRs in V20.3.0, V19.9.0:
- SA2 #176: 21 CRs
Plenary meetings:
- TSG SA #113 approved V20.3.0 (Rel-20)
- TSG SA #112 approved V20.2.0 (Rel-20)
- TSG SA #113 approved V19.9.0 (Rel-19)
Source: 3GPP CR database and specification archive, as indexed by 3GPP Scout.
Clauses changed in V20.3.0
33 clauses changed or added in V20.3.0. The 10 with the largest edits are listed. Each clause number opens Scout on that clause.
| Clause | Title | Change | CRs |
|---|---|---|---|
| 4.2.2.2.2 | General Registration | changed | CR 5797 |
| 5.2.6.9.1 | General | changed | CR 5782 |
| 5.2.6.36.3 | Nnef_UEAddress_Subscribe service operation | changed | CR 5801 |
| 5.2.6.42.1 | General | added | |
| 5.2.6.42.2 | Nnef_ImsMC_MediaInstruction | added | |
| 4.3.2.2.2 | Home-routed Roaming | changed | CR 5785 |
| 4.16.3.2 | AMF-initiated AM Policy Association Termination | changed | CR 5779 |
| 4.16.7.3 | Procedure for BDT warning notification | changed | CR 5778 |
| 4.16.11.1 | General | changed | CR 5790 |
| 4.16.15.2.2 | Procedure for PDTQ warning notification | changed | CR 5778 |
Source: 3GPP Scout comparison of this version with the one before it.
Sources
- 3GPP TS 23.502 V20.3.0, clause 1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/23_series/23.502/23502-k30.zip
- 3GPP TS 23.502 V20.3.0, clause 4.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/23_series/23.502/23502-k30.zip
- 3GPP CR database.
How this page was made
The facts box and the tables come straight from the 3GPP specification archive and CR database as indexed by 3GPP Scout. An AI model (GPT-6 Luna) wrote the paragraph and named the source of each sentence. Code checked every quote word for word against the stored source text and every number against the cited source. A second AI model from another company (Claude Opus 5.5) reviewed the paragraph against the same sources. The 3GPP documents themselves govern.