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Spec changeRAN #113TS 38.321

TS 38.321 V19.4.0 changes DRX checks and stops LP-WUS monitoring in gaps

Published 2026-10-16Updated 2026-10-163GPP TSG RAN #113

At a glance

TS 38.321 V19.4.0, the New Radio Medium Access Control specification, changes low-power wake-up signal (LP-WUS) checks and stops LP-WUS monitoring during measurement gaps.

What changed

In clause 5.7, discontinuous reception (DRX) now tests receipt of the LP-WUS indication associated with the current cycle. Previously, that condition required the indication to start drx-onDurationTimer, the timer for the DRX on duration. Clause 5.7 says the other LP-WUS indication is "received from lower layer as specified in TS 38.213 [6]". Previously, this condition checked whether the indication said to start lpwus-PDCCH-MonitoringTimer. Our reading: in both conditions, receipt replaces checking whether the indication says to start a timer. Change request (CR) 2194 covers both clause 5.7 edits for Radio Resource Control connected state (RRC_CONNECTED). Samsung, Nokia, Ericsson, Xiaomi and LGE are listed as CR 2194's working-group sources.

Source: 3GPP TS 38.321 V19.4.0, clause 5.7. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/38_series/38.321/38321-j40.zip

Clause 5.14 says to "not monitor the LP-WUS" during measurement gaps. CR 2203 identifies this as a correction concerning LP-WUS monitoring during measurement gaps. NEC is listed as the source of CR 2203 in RP-262144 at RP-113. CR 2196 separately changes clause 5.36.2 in the same version.

Source: 3GPP TS 38.321 V19.4.0, clause 5.14. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/38_series/38.321/38321-j40.zip

Sources

  1. 3GPP TS 38.321 V19.4.0, clause 5.7. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/38_series/38.321/38321-j40.zip
  2. 3GPP TS 38.321 V19.4.0, clause 5.14. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/38_series/38.321/38321-j40.zip
  3. CR 2196 (R2-2605861, vivo (Rapporteur), Ericsson): Miscellaneous corrections on MAC for Mob Ph4, approved in RP-262144 at RAN #113. Source: 3GPP CR database.
  4. 3GPP TS 38.321 V19.3.0, clause 5.7. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/38_series/38.321/38321-j30.zip
  5. CR 2194 (R2-2605882, Samsung, Nokia, Ericsson, Xiaomi, LGE): Correction on criteria for starting timer after reception of LPWUS in RRC_CONNECTED, approved in RP-262144 at RAN #113. Source: 3GPP CR database.
  6. CR 2203 (R2-2605884, NEC): Correction on no LP-WUS monitoring during measurement gaps, approved in RP-262144 at RAN #113. Source: 3GPP CR database.
  7. 3GPP TS 38.321 V19.4.0, clause 5.36.2. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/38_series/38.321/38321-j40.zip
  8. 3GPP TS 38.321 V19.3.0, clause 5.36.2. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/38_series/38.321/38321-j30.zip

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