uilt between the eNB and RNC entities is a direct bearer; - the feature Direct Tunnel is not available. 1) to 4) The messages are equivalent to messages 1 to 4 described for the preparation phase of the handover based on S1 with relocation of the MME and SGW entities. 5) The SGSN entity transmits to the RNC entity the message RANAP RELOCATION REQUEST to reserve resources in the radio access network. 6) The RNC entity responds with the message RANAP RELOCATION REQUEST ACK to acknowledge the request. 7), 8) The messages are equivalent to messages 11 and 12 described for the preparation phase of the handover based on S1 with relocation of the MME and SGW entities. 9) The message is equivalent to the message 1 described for the execution phase of the handover based on S1 with relocation of the MME and SGW entities. Handover Source Former Radio Bearer S1 Bearer S5 Bearer S1-AP HANDOVER REQUIRED GTPv2-C FORWARD RELOCATION REQUEST GTPv2-C CREATE SESSION REQUEST GTPv2-C CREATE SESSION REQUEST RANAP RELOCATION REQUEST RANAP RELOCATION REQUEST ACK GTPv2-C FORWARD RELOCATION RESPONSE S1-AP HANDOVER COMMAND RRC ConnectionReconfiguration RRC HandovertoUTRANComplete S1 Bearer S5 Bearer Temporary Radio Bearer Radio Bearer S1 Bearer S5 Bearer RANAP RELOCATION COMPLETE GTPv2-C FORWARD RELOCATION COMPLETE NOTIFICATION GTPv2-C FORWARD RELOCATION COMPLETE ACKNOWLEDGE GTPv2-C MODIFY BEARER REQUEST GTPv2-CMODIFY BEARER REQUEST GTPv2-C MODIFY BEARER RESPONSE GTPv2-C MODIFY BEARER RESPONSE Radio Bearer S1 Bearer S5 Bearer S1-AP UE CONTEXT RELEASE REQUEST S1-AP UE CONTEXT RELEASE COMPLETE GTPv2-C DELETE SESSION REQUEST GTPv2-C DELETE SESSION RESPONSE Figure 7.11. PS-PS inter-system handover procedure 10) The mobile confirms its connection to the RNC entity with the RRC HandovertoUTRANComplete message. 11) The RNC entity informs the SGSN entity about the connection of the mobile with the message RANAP RELOCATION COMPLETE. 222 VoLTE and ViLTE 12) to 17) The messages are equivalent to messages 2 to 7 described for the completion phase of th