Timer value
4s In WB-S1/CE mode, 12s NOTE 4
Source: 3GPP TS 24.301 V20.1.0, clause 10.3, table 10.3.2. © 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 / T3489
TS 24.301NAS timer
Timer T3489: EPS session management, network side
In plain words
The network starts T3489 when it sends an ESM INFORMATION REQUEST and retransmits the request only on the first and second expiries.
Our summary of the spec text quoted below.
What the spec says
Started when
ESM INFORMATION REQUEST sent
Source: 3GPP TS 24.301 V20.1.0, clause 10.3, table 10.3.2. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
Stopped when
ESM INFORMATION RESPONSE received
Source: 3GPP TS 24.301 V20.1.0, clause 10.3, table 10.3.2. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
On expiry
Retransmission of ESM INFORMATION REQUEST on 1st and 2nd expiry only
Source: 3GPP TS 24.301 V20.1.0, clause 10.3, table 10.3.2. © 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 10.3.2. © 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 line was 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.