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Glossary

RB (Radio Bearer) in 3GPP: meaning and where it is specified

Published 2026-10-16Updated 2026-10-16

At a glance

Term
RB
Stands for
Radio Bearer
Defined in
3GPP TR 21.905 V19.2.0, clause 4
Used in
TS 25.423, TS 44.118

In plain words

In 3GPP vocabulary, RB stands for Radio Bearer, giving the term its expanded name. In TS 25.423, the specification says "The RB Identity is the identifier of a radio bearer.". TS 44.118 also includes syntax for an RB Identity IE, showing another place where the term appears.

Source: 3GPP TS 25.423 V19.0.0, clause 9.2.3.5B. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/25_series/25.423/25423-j00.zip

Sources

  1. 3GPP TR 21.905 V19.2.0, clause 4. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/21_series/21.905/21905-j20.zip
  2. 3GPP TS 25.423 V19.0.0, clause 9.2.3.5B. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/25_series/25.423/25423-j00.zip
  3. 3GPP TS 44.118 V16.0.0, clause 9.3.80. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/44_series/44.118/44118-g00.zip

How this page was made

The facts box comes straight from the 3GPP TDoc list and specification archive 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.