Specification
3GPP TS 36.321: Evolved Universal Terrestrial Radio Access (E-UTRA); Medium Access Control (MAC) protocol specification
At a glance
- Title
- Evolved Universal Terrestrial Radio Access (E-UTRA); Medium Access Control (MAC) protocol specification
- Newest version
- V19.3.0 (Rel-19)
- Versions indexed
- 6
- Newest per release
- Rel-15: V15.11.0 (2021-01-06); Rel-16: V16.9.0 (2024-01-12); Rel-17: V17.7.0 (2024-01-12); Rel-18: V18.5.0 (2025-10-07); Rel-19: V19.3.0 (2026-06-28)
In plain words
TS 36.321 specifies the E-UTRA MAC protocol, defining the scope of this specification. Its objective is to describe the MAC architecture and the MAC entity from a functional point of view "The objective is to describe the MAC architecture and the MAC entity from a functional point of view.". Functionality specified for the UE also applies to the RN, but only for functionality necessary for the RN.
Source: 3GPP TS 36.321 V19.3.0, clause 4.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/36_series/36.321/36321-j30.zip
Newest version in each release
| Release | Newest version | In the archive | TSG meeting |
|---|---|---|---|
| Rel-19 | V19.3.0 | 2026-06-28 | TSG RAN #112 |
| Rel-18 | V18.5.0 | 2025-10-07 | TSG RAN #109 |
| Rel-17 | V17.7.0 | 2024-01-12 | TSG RAN #102 |
| Rel-16 | V16.9.0 | 2024-01-12 | TSG RAN #102 |
| Rel-15 | V15.11.0 | 2021-01-06 | TSG RAN #90-e |
Source: 3GPP specification archive, versions indexed by 3GPP Scout. Each version links its official file.
Meetings behind the latest versions
Plenary meetings:
- TSG RAN #112 approved V19.3.0 (Rel-19)
- TSG RAN #110 approved V19.1.0 (Rel-19)
- TSG RAN #109 approved V18.5.0 (Rel-18)
Source: 3GPP CR database and specification archive, as indexed by 3GPP Scout.
Sources
- 3GPP TS 36.321 V19.3.0, clause 1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/36_series/36.321/36321-j30.zip
- 3GPP TS 36.321 V19.3.0, clause 4.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/36_series/36.321/36321-j30.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.