Specification
3GPP TS 29.118: Mobility Management Entity (MME) Visitor Location Register (VLR) SGs interface specification
At a glance
- Title
- Mobility Management Entity (MME) Visitor Location Register (VLR) SGs interface specification
- Newest version
- V19.1.0 (Rel-19)
- Versions indexed
- 5
- Newest per release
- Rel-15: V15.2.0 (2018-03-28); Rel-16: V16.0.0 (2020-07-09); Rel-17: V17.0.0 (2022-04-04); Rel-18: V18.0.0 (2023-03-31); Rel-19: V19.1.0 (2025-07-01)
In plain words
TS 29.118 says CS Fallback in the Evolved Packet System (EPS) enables CS-domain services by reusing CS infrastructure when the UE is served by E-UTRAN. SMS delivery via the CS core network is realized without CS fallback, and the specification covers "the use of Stream Control Transmission Protocol (SCTP) for the transport of SGsAP messages". For CS fallback and SMS delivery, the MME and VLR reuse Gs interface mechanisms defined in 3GPP TS 29.018.
Source: 3GPP TS 29.118 V19.1.0, clause 1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/29_series/29.118/29118-j10.zip
Newest version in each release
| Release | Newest version | In the archive | TSG meeting |
|---|---|---|---|
| Rel-19 | V19.1.0 | 2025-07-01 | TSG CT #108 |
| Rel-18 | V18.0.0 | 2023-03-31 | TSG CT #99 |
| Rel-17 | V17.0.0 | 2022-04-04 | not recorded |
| Rel-16 | V16.0.0 | 2020-07-09 | not recorded |
| Rel-15 | V15.2.0 | 2018-03-28 | TSG CT #79 |
Source: 3GPP specification archive, versions indexed by 3GPP Scout. Each version links its official file.
Meetings behind the latest versions
Plenary meetings:
- TSG CT #108 approved V19.1.0 (Rel-19)
- TSG CT #99 approved V18.0.0 (Rel-18)
Source: 3GPP CR database and specification archive, as indexed by 3GPP Scout.
Sources
- 3GPP TS 29.118 V19.1.0, clause 1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/29_series/29.118/29118-j10.zip
- 3GPP TS 29.118 V19.1.0, clause 4.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/29_series/29.118/29118-j10.zip
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.