3GPP Scout / Glossary

Glossary

SSDT (Site Selection Diversity Transmission) in 3GPP: meaning and where it is specified

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

At a glance

Term
SSDT
Stands for
Site Selection Diversity Transmission
Defined in
3GPP TR 21.905 V19.2.0, clause 4
Used in
TS 34.121-1

In plain words

In 3GPP TR 21.905, SSDT is expanded as "Site Selection Diversity Transmission", identifying it as a site selection diversity transmission term in the vocabulary entry. TS 34.121-1 uses SSDT in clause 7.6.3.2, which covers DCH requirements during multi-path propagation conditions in SSDT Mode.

Source: 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

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 34.121-1 V16.2.0, clause 7.6.3.2. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/34_series/34.121-1/34121-1-g20.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.