Section: 5.5.2.2.4 UTRAN Iu mode to E-UTRAN Inter RAT handover reject
Content: The Target eNodeB may reject the use of the Handover procedure if none of the requested EPS bearers in the Handover Request message could be established. In this case no UE context is established in the target MME/eNodeB and no resources are allocated. The UE remains in the Source RNC/SGSN. Figure 5.5.2.2.4-1: UTRAN Iu mode to E-UTRAN Inter RAT HO reject 1. Steps 1 to 5 in the flow are identical to the ones in clause 5.5.2.2.2. 6. If the Target eNodeB fails to allocate any resources for any of the requested EPS Bearers it sends a Handover Failure (Cause) message to the Target MME. When the Target MME receives the Handover Failure message from Target eNodeB the Target MME clears any reserved resources for this UE. 7. This step is only performed for Serving GW relocation, i.e. if Steps 4/4a have been performed. The Target MME deletes the EPS bearer resources by sending Delete Session Request (Cause) messages to the Target Serving GW. The Target Serving GW acknowledges with Delete Session Response (Cause) messages. 8. The Target MME sends the Forward Relocation Response (Cause) message to the Source SGSN. 9. When the Source SGSN receives the Forward Relocation Response message it send a Relocation Preparation Failure (Cause) message to the Source RNC.