G.2 Parameter errors in the address field

3GPP44.006Data Link (DL) layer specificationMobile Station - Base Station System (MS - BSS) interfaceRelease 17TS

G.2.1 Unallocated SAPI

No action shall be taken on frames containing an unallocated SAPI.

G.2.2 Wrong value of the C/R bit

‑ I frame, C/R bit indicates response;

‑ SABM frame, C/R bit indicates response;

‑ UI frame, C/R bit indicates response;

‑ UA frame, C/R bit indicates command;

‑ DISC frame, C/R bit indicates response;

‑ DM frame, C/R bit indicates command.

Actions:

– An MDL‑ERROR‑INDICATION primitive with cause "frame not implemented" is sent to the mobile management entity.

G.2.3 EA bit set to "0"

Frames with EA bit set to "0" are not allowed in the GSM system.

Actions:

– An MDL‑ERROR‑INDICATION primitive with cause "frame not implemented" is sent to the mobile management entity.