Name in the cause table
Protocol error, unspecified
Source: 3GPP TS 24.501 V20.1.0, clause 9.11.3.2, table 9.11.3.2.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24501-k10.zip in the 3GPP archive.
3GPP Scout / Reference / 5GMM causes / Cause #111 in 5GMM and 5GSM
TS 24.5015GMM cause5GSM cause
Cause #111 in 5GMM and 5GSM: Protocol error, unspecified
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.
5GMM cause #111: Protocol error, unspecified
In plain words
This cause reports a protocol error event only when no other 5GMM cause in the protocol error class applies.
Our summary of the spec text quoted below.
When it is used
This 5GMM cause is used to report a protocol error event only when no other 5GMM cause in the protocol error class applies.
Source: 3GPP TS 24.501 V20.1.0, clause A.4. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24501-k10.zip in the 3GPP archive.
5GSM cause #111: Protocol error, unspecified
In plain words
This cause reports a protocol error only when no other 5GSM cause in the protocol error class applies.
Our summary of the spec text quoted below.
Name in the cause table
Protocol error, unspecified
Source: 3GPP TS 24.501 V20.1.0, clause 9.11.4.2, table 9.11.4.2.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24501-k10.zip in the 3GPP archive.
When it is used
This 5GSM cause is used to report a protocol error event only when no other 5GSM cause in the protocol error class applies.
Source: 3GPP TS 24.501 V20.1.0, clause B.2. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24501-k10.zip in the 3GPP archive.
Same causes in EPS (TS 24.301)
TS 24.301 defines the corresponding causes for EPS. Their pages quote the EPS wording.
- EMM cause #111 (TS 24.301)
- ESM cause #111 (TS 24.301)
How this page was made
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.