Section: 7.2.6 Bearer Resource Failure Indication
Content: A Bearer Resource Failure Indication shall be sent by the PGW to an SGW and forwarded to the MME to indicate failure of the UE requested bearer resource allocation procedure or UE requested bearer resource modification procedure, as specified by 3GPP TS 24.301[ Non-Access-Stratum (NAS) protocol for Evolved Packet System (EPS); Stage 3 ]  [23]. The message shall also be sent by a PGW to an SGW and forwarded to an SGSN as part of the failure of an MS initiated PDP Context modification procedure or secondary PDP context activation procedure. The message shall also be sent on the S5/S8 or S2a/S2b interface by a PGW to a SGW or to a TWAN/ePDG and the S11/S4 interface by a SGW to an MME/S4-SGSN as part of the UE-initiated IP flow mobility procedure and the UE requested IP flow mapping procedure, as specified by 3GPP TS 23.161[ Network-Based IP Flow Mobility (NBIFOM); Stage 2 ]  [71]. Table -1 specifies the presence of the IEs in the message. Possible Cause values are specified in Table 8.4-1. Message specific cause values are: - "Semantic error in the TAD operation". - "Syntactic error in the TAD operation". - "Semantic errors in packet filter(s)". - "Syntactic errors in packet filter(s)". - "Collision with network initiated request". - "Service denied". - "Bearer handling not supported". - "UE context without TFT already activated". Table -1: Information Elements in a Bearer Resource Failure Indication Table 7.2.6-2: Overload Control Information within Bearer Resource Failure Indication