Section: 5.5.2.3.4 E-UTRAN to GERAN A/Gb mode Inter RAT handover reject
Content: The Target BSS may reject the use of the Handover procedure if none of the requested PFCs in the PS Handover Request message could be established. In this case no UE context is established in the target SGSN/BSS and no resources are allocated. The UE remains in the Source eNodeB/MME. Figure 5.5.2.3.4-1: E-UTRAN to GERAN A/Gb Inter RAT HO reject 1. Steps 1 to 5 in the flow are identical to the ones in clause 5.5.2.3.2. 6. If the Target BSS fails to allocate any resources for any of the requested PFCs it sends a PS Handover Request Nack (Cause) message to the Target SGSN. When the Target SGSN receives the PS Handover Request Nack message from Target BSS the Target SGSN 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 SGSN 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 SGSN sends the Forward Relocation Response (Cause) message to the Source MME. 9. When the Source MME receives the Forward Relocation Response message it send a Handover Preparation Failure (Cause) message to the Source eNodeB.