Specification
3GPP TS 29.503: 5G System; Unified Data Management Services; Stage 3
At a glance
- Title
- 5G System; Unified Data Management Services; Stage 3
- Newest version
- V20.1.0 (Rel-20)
- Versions indexed
- 8
- Newest per release
- Rel-16: V16.18.0 (2026-07-01); Rel-17: V17.22.0 (2026-07-01); Rel-18: V18.13.0 (2026-07-01); Rel-19: V19.7.0 (2026-07-01); Rel-20: V20.1.0 (2026-09-28)
In plain words
TS 29.503 specifies "the stage 3 protocol and data model for the Nudm Service Based Interface.", and provides stage 3 protocol definitions, message flows, and APIs for each service offered by the UDM. V20.1.0 includes 7 CRs covering UE policy association, UDM support for INS for Disaster Condition, and UE Allowed to Operate as AIoT UE Reader. Other CR subjects include MPS for Messaging priority treatment by the UDM, a 204 Response Code correction, a table-number correction, and API version and External doc updates.
Source: 3GPP TS 29.503 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/29.503/29503-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 | V19.7.0 | 2026-07-01 | TSG CT #112 |
| Rel-18 | V18.13.0 | 2026-07-01 | TSG CT #112 |
| Rel-17 | V17.22.0 | 2026-07-01 | TSG CT #112 |
| Rel-16 | V16.18.0 | 2026-07-01 | TSG CT #112 |
| Rel-15 | V15.10.0 | 2021-12-17 | TSG CT #94-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 29.503 includes 7 CRs.
| CR | Category | Subject | Source | Working group meeting | TSG TDoc |
|---|---|---|---|---|---|
| CR 1560 rev 2 | B | UE policy association | Nokia, Verizon | CT4 #136 | CP-262017 |
| CR 1573 | B | UDM support for INS for Disaster Condition | China Unicom | CT4 #136 | CP-262037 |
| CR 1574 rev 1 | B | UE Allowed to Operate as AIoT UE Reader | ZTE, Samsung, Lenovo, Motorola Mobility | CT4 #136 | CP-262018 |
| CR 1576 rev 1 | F | Priority treatment by the UDM for MPS for Messaging | Peraton Labs, CISA ECD, AT&T, T-Mobile US, Verizon | CT4 #136 | CP-262210 |
| CR 1577 rev 1 | F | Correction on the 204 Response Code for Subscription Modification | Ericsson, HPE-US | CT4 #136 | CP-262017 |
| CR 1579 | F | Update the incorrect table number | Huawei | CT4 #136 | CP-262017 |
| CR 1583 | 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:
- CT4 #136: 7 CRs
Plenary meetings:
- TSG CT #113 approved V20.1.0 (Rel-20)
- TSG CT #112 approved V20.0.0 (Rel-20)
- TSG CT #112 approved V19.7.0 (Rel-19)
Source: 3GPP CR database and specification archive, as indexed by 3GPP Scout.
Clauses changed in V20.1.0
16 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 |
|---|---|---|---|
| 6.1.6.2.4 | Type: AccessAndMobilitySubscriptionData | changed | CR 1560, CR 1574 |
| 2 | References | changed | CR 1560, CR 1574 |
| 5.3.2.3.2 | UDM initiated NF Deregistration | changed | CR 1573 |
| 6.2.6.2.2 | Type: Amf3GppAccessRegistration | changed | CR 1573 |
| 1 | Scope | changed | |
| A.2 | Nudm_SDM API | changed | CR 1560, CR 1574 |
| 5.2.2.7.2 | Modification of a subscription to notifications of data change | changed | CR 1577 |
| 5.2.2.7.3 | Modification of a subscription to notifications of shared data change | changed | CR 1577 |
| 5.3.2.13.2 | Send Routing Information For SM | changed | |
| 6.1.3.4.3.2 | PATCH | changed | CR 1577 |
Source: 3GPP Scout comparison of this version with the one before it.
Sources
- 3GPP TS 29.503 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/29.503/29503-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.