Name in the cause table
Protocol error, unspecified
Source: 3GPP TS 24.301 V20.1.0, clause 9.9.3.9, table 9.9.3.9.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
3GPP Scout / Reference / EMM causes / Cause #111 in EMM and ESM
TS 24.301EMM causeESM cause
Cause #111 in EMM and ESM: Protocol error, unspecified
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.
EMM cause #111: Protocol error, unspecified
In plain words
This cause means an unspecified protocol error.
Our summary of the spec text quoted below.
When it is used
See 3GPP TS 24.008 [13], annex H, clause H.6.8.
Source: 3GPP TS 24.301 V20.1.0, clause A.5. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
ESM cause #111: Protocol error, unspecified
In plain words
This cause reports a protocol error event only when no other ESM 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 24.301 V20.1.0, clause 9.9.4.4, table 9.9.4.4.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
When it is used
This ESM cause is used to report a protocol error event only when no other ESM cause in the protocol error class applies.
Source: 3GPP TS 24.301 V20.1.0, clause B.2. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: 24301-k10.zip in the 3GPP archive.
Same causes in 5GS (TS 24.501)
TS 24.501 defines the corresponding causes for 5GS. Their pages quote the 5GS wording.
- 5GMM cause #111 (TS 24.501)
- 5GSM cause #111 (TS 24.501)
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.