3GPP Scout / Reference / 5GS NAS timers / Timers T3580, T3581 and T3582
TS 24.501NAS timer
Covers
TS 24.501 words these values in parallel, so they share this page. Each has its own section with the spec text and a plain explanation.
In plain words
The UE starts T3580 when sending PDU SESSION ESTABLISHMENT REQUEST and retransmits the message when the timer expires.
Our summary of the spec text quoted below.
16s In WB-N1/CE mode, 24s For access via a satellite NG-RAN cell, 21s NOTE 7
Source: 3GPP TS 24.501 V20.1.0, clause 10.3, table 10.3.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24501-k10.zip in the 3GPP archive.
Transmission of PDU SESSION ESTABLISHMENT REQUEST message
Source: 3GPP TS 24.501 V20.1.0, clause 10.3, table 10.3.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24501-k10.zip in the 3GPP archive.
Retransmission of PDU SESSION ESTABLISHMENT REQUEST message
Source: 3GPP TS 24.501 V20.1.0, clause 10.3, table 10.3.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24501-k10.zip in the 3GPP archive.
PDU SESSION ESTABLISHMENT ACCEPT message received or PDU SESSION ESTABLISHMENT REJECT message received or PDU SESSION ESTABLISHMENT REQUEST message received in [...]
Source: 3GPP TS 24.501 V20.1.0, clause 10.3, table 10.3.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24501-k10.zip in the 3GPP archive.
In plain words
The UE starts T3581 when sending PDU SESSION MODIFICATION REQUEST and retransmits the message when the timer expires.
Our summary of the spec text quoted below.
16s In WB-N1/CE mode, 24s For access via a satellite NG-RAN cell, 21s NOTE 7
Source: 3GPP TS 24.501 V20.1.0, clause 10.3, table 10.3.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24501-k10.zip in the 3GPP archive.
Transmission of PDU SESSION MODIFICATION REQUEST message
Source: 3GPP TS 24.501 V20.1.0, clause 10.3, table 10.3.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24501-k10.zip in the 3GPP archive.
Retransmission of PDU SESSION MODIFICATION REQUEST message
Source: 3GPP TS 24.501 V20.1.0, clause 10.3, table 10.3.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24501-k10.zip in the 3GPP archive.
PDU SESSION MODIFICATION COMMAND message with the same PTI is received or PDU SESSION MODIFICATION REJECT message received or PDU SESSION [...]
Source: 3GPP TS 24.501 V20.1.0, clause 10.3, table 10.3.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24501-k10.zip in the 3GPP archive.
In plain words
The UE starts T3582 when sending PDU SESSION RELEASE REQUEST and retransmits the message when the timer expires.
Our summary of the spec text quoted below.
16s In WB-N1/CE mode, 24s For access via a satellite NG-RAN cell, 21s NOTE 7
Source: 3GPP TS 24.501 V20.1.0, clause 10.3, table 10.3.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24501-k10.zip in the 3GPP archive.
Transmission of PDU SESSION RELEASE REQUEST message
Source: 3GPP TS 24.501 V20.1.0, clause 10.3, table 10.3.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24501-k10.zip in the 3GPP archive.
Retransmission of PDU SESSION RELEASE REQUEST message
Source: 3GPP TS 24.501 V20.1.0, clause 10.3, table 10.3.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24501-k10.zip in the 3GPP archive.
PDU SESSION RELEASE COMMAND message with the same PTI is received or PDU SESSION RELEASE REJECT message received
Source: 3GPP TS 24.501 V20.1.0, clause 10.3, table 10.3.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24501-k10.zip in the 3GPP archive.
3GPP Scout built this page from TS 24.501 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.