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Glossary

DF (Dedicated File) in 3GPP: meaning and where it is specified

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

At a glance

Term
DF
Stands for
Dedicated File
Defined in
3GPP TR 21.905 V19.2.0, clause 4
Used in
TS 31.102, TS 31.121

In plain words

DF means Dedicated File. TS 31.121 uses it in Application DF (ADF), an "entry point to an application". TS 31.102 clause 4.4.4 specifies the EFs in the dedicated file DF at the MExE level, as indicated by the clause title.

Source: 3GPP TS 31.121 V19.0.0, clause 3.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/31_series/31.121/31121-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 31.121 V19.0.0, clause 3.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/31_series/31.121/31121-j00.zip
  3. 3GPP TS 31.102 V16.17.0, clause 4.4.4. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/31_series/31.102/31102-gh0.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.