Timer value
8s In WB-S1/CE mode, 16s NOTE 4
Source: 3GPP TS 24.301 V20.1.0, clause 10.3, table 10.3.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
3GPP Scout / Reference / EPS NAS timers / Timers T3480, T3481 and T3482
TS 24.301NAS timer
Timers T3480, T3481 and T3482: ESM request retransmission by the UE
Covers
TS 24.301 words these values in parallel, so they share this page. Each has its own section with the spec text and a plain explanation.
Timer T3480: EPS session management, UE side
In plain words
The UE starts T3480 when it sends a BEARER RESOURCE ALLOCATION REQUEST and retransmits the request when the timer expires.
Our summary of the spec text quoted below.
Started when
BEARER RESOURCE ALLOCATION REQUEST sent
Source: 3GPP TS 24.301 V20.1.0, clause 10.3, table 10.3.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
On expiry
Retransmission of BEARER RESOURCE ALLOCATION REQUEST
Source: 3GPP TS 24.301 V20.1.0, clause 10.3, table 10.3.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
Stopped when
ACTIVATE DEDICATED EPS BEARER CONTEXT REQUEST received or MODIFY EPS BEARER CONTEXT REQUEST received or BEARER RESOURCE ALLOCATION REJECT received
Source: 3GPP TS 24.301 V20.1.0, clause 10.3, table 10.3.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
State
PROCEDURE TRANSACTION PENDING
Source: 3GPP TS 24.301 V20.1.0, clause 10.3, table 10.3.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
Timer T3481: EPS session management, UE side
In plain words
The UE starts T3481 when it sends a BEARER RESOURCE MODIFICATION REQUEST and retransmits the request when the timer expires.
Our summary of the spec text quoted below.
Timer value
8s In WB-S1/CE mode, 16s NOTE 4
Source: 3GPP TS 24.301 V20.1.0, clause 10.3, table 10.3.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
Started when
BEARER RESOURCE MODIFICATION REQUEST sent
Source: 3GPP TS 24.301 V20.1.0, clause 10.3, table 10.3.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
On expiry
Retransmission of BEARER RESOURCE MODIFICATION REQUEST
Source: 3GPP TS 24.301 V20.1.0, clause 10.3, table 10.3.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
Stopped when
ACTIVATE DEDICATED EPS BEARER CONTEXT REQUEST received or MODIFY EPS BEARER CONTEXT REQUEST received or DEACTIVATE EPS BEARER CONTEXT REQUEST received or BEARER RESOURCE MODIFICATION REJECT received
Source: 3GPP TS 24.301 V20.1.0, clause 10.3, table 10.3.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
State
PROCEDURE TRANSACTION PENDING
Source: 3GPP TS 24.301 V20.1.0, clause 10.3, table 10.3.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
Timer T3482: EPS session management, UE side
In plain words
The UE starts T3482 when it requests an additional PDN connection not combined in attach procedure and retransmits PDN CONNECTIVITY REQUEST when the timer expires.
Our summary of the spec text quoted below.
Timer value
8s In WB-S1/CE mode, 16s NOTE 4
Source: 3GPP TS 24.301 V20.1.0, clause 10.3, table 10.3.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
Started when
An additional PDN connection is requested by the UE which is not combined in attach procedure
Source: 3GPP TS 24.301 V20.1.0, clause 10.3, table 10.3.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
On expiry
Retransmission of PDN CONNECTIVITY REQUEST
Source: 3GPP TS 24.301 V20.1.0, clause 10.3, table 10.3.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
Stopped when
ACTIVE DEFAULT EPS BEARER CONTEXT REQUEST received or PDN CONNECTIVITY REJECT received
Source: 3GPP TS 24.301 V20.1.0, clause 10.3, table 10.3.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
State
PROCEDURE TRANSACTION PENDING
Source: 3GPP TS 24.301 V20.1.0, clause 10.3, table 10.3.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
How this page was made
3GPP Scout built this page from TS 24.301 V20.1.0 as indexed on 2026-10-15. The quotes are copied from the spec, and code checks each one against the stored text and the 3GPP archive file before publishing. The plain-words lines were written by an AI model (GPT-6 Sol) and checked against the quotes by a second AI model from another company (Claude Opus 5.5). The official 3GPP text governs.