Specification
3GPP TS 29.502: 5G System; Session Management Services; Stage 3
At a glance
- Title
- 5G System; Session Management Services; Stage 3
- Newest version
- V20.1.0 (Rel-20)
- Versions indexed
- 10
- Newest per release
- Rel-16: V16.17.0 (2026-01-06); Rel-17: V17.14.0 (2026-01-06); Rel-18: V18.12.0 (2026-09-28); Rel-19: V19.8.0 (2026-09-28); Rel-20: V20.1.0 (2026-09-28)
In plain words
TS 29.502 covers "the stage 3 protocol and data model for the Nsmf Service Based Interface". It defines protocol messages and flows, plus APIs for SMF services, except Session Management Event Exposure and Session Management services for Non-IP Data Delivery (NIDD). V20.1.0 has five CR subjects: review corrections, attribute names and cardinality, Sm Context Type retrieval, Additional ULI for MWAB, and API version and External doc updates.
Source: 3GPP TS 29.502 V20.1.0, clause 1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/29_series/29.502/29502-k10.zip
Newest version in each release
| Release | Newest version | In the archive | TSG meeting |
|---|---|---|---|
| Rel-20 | V20.1.0 | 2026-09-28 | TSG CT #113 |
| Rel-19 | V19.8.0 | 2026-09-28 | TSG CT #113 |
| Rel-18 | V18.12.0 | 2026-09-28 | TSG CT #113 |
| Rel-17 | V17.14.0 | 2026-01-06 | TSG CT #110 |
| Rel-16 | V16.17.0 | 2026-01-06 | TSG CT #110 |
| Rel-15 | V15.10.0 | 2021-03-30 | TSG CT #91-e |
Source: 3GPP specification archive, versions indexed by 3GPP Scout. Each version links its official file.
Change requests in V20.1.0
V20.1.0 of TS 29.502 includes 5 CRs.
| CR | Category | Subject | Source | Working group meeting | TSG TDoc |
|---|---|---|---|---|---|
| CR 0952 | F | Corrections from comprehensive review of TS 29.502 | Nokia | CT4 #136 | CP-262021 |
| CR 0953 | A | Attribute names and cardinality inconsistencies | Nokia | CT4 #136 | CP-262031 |
| CR 0956 rev 2 | F | Corrections on Sm Context Type for SM Context Retrieval | Ericsson | CT4 #136 | CP-262017 |
| CR 0958 rev 2 | B | Support of Additional ULI for MWAB | Huawei, CATT | CT4 #136 | CP-262040 |
| CR 0961 | F | API version and External doc update | Nokia | CT4 #136 | CP-262044 |
Source: 3GPP CR database.
Meetings behind the latest versions
Working group meetings that agreed the CRs in V20.1.0, V19.8.0, V18.12.0:
- CT4 #136: 9 CRs
Plenary meetings:
- TSG CT #113 approved V20.1.0 (Rel-20)
- TSG CT #112 approved V20.0.0 (Rel-20)
- TSG CT #113 approved V19.8.0 (Rel-19)
Source: 3GPP CR database and specification archive, as indexed by 3GPP Scout.
Clauses changed in V20.1.0
69 clauses changed or added in V20.1.0. The 10 with the largest edits are listed. Each clause number opens Scout on that clause.
| Clause | Title | Change | CRs |
|---|---|---|---|
| A.2 | Nsmf_PDUSession API | changed | CR 0953, CR 0958 |
| 5.2.2.2.1 | General | changed | CR 0958 |
| 5.2.2.7.1 | General | changed | CR 0958 |
| 6.1.6.1 | General | changed | CR 0958 |
| 6.1.6.2.2 | Type: SmContextCreateData | changed | CR 0953, CR 0958 |
| 6.1.6.2.4 | Type: SmContextUpdateData | changed | CR 0958 |
| 6.1.6.2.7 | Type: SmContextRetrieveData | changed | CR 0956 |
| 6.1.6.2.9 | Type: PduSessionCreateData | changed | CR 0958 |
| 6.1.6.2.11 | Type: HsmfUpdateData | changed | CR 0953, CR 0958 |
| 6.1.6.2.27 | Type: SmContextRetrievedData | changed | CR 0956 |
Source: 3GPP Scout comparison of this version with the one before it.
Sources
- 3GPP TS 29.502 V20.1.0, clause 1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/29_series/29.502/29502-k10.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.