Section: Annex C (Normative): MME/S4-SGSN mapping table between S11/S4 and NAS Cause values
Content: The MME/S4-SGSN initiates session management requests towards the SGW and PGW or mobility management requests towards the source/target MME/S4-SGSN. If this operation is not successful, there are several possible cause codes, which need to be mapped to the appropriate cause codes over NAS to the UE. Additionally, the MME/S4-SGSN initiates session management requests towards the UE. If this operation is not successful, there are several possible NAS cause codes which need to be mapped to the appropriate GTP cause codes over S11/S4 interface towards the SGW. The MME/S4-SGSN should map these cause codes as defined in tables C.1 to C.5 unless specified otherwise in the tables. Table C.1: Mapping from S11/S4 to NAS Cause values – Rejection indication from SGW Table C.2: Mapping from S11/S4 to NAS Cause values – Acceptance indication from SGW Table C.3: Mapping from S11/S4 to NAS Cause values – Indication in request from SGW Table C.4: Mapping from NAS to S11/S4 Cause values – Rejection indication from MME/S4-SGSN Table C.5: Mapping from S3/S16 to NAS Cause values – Rejection indication from MME/S4-SGSN