着呼、発呼

WO2013134045(特表2015-515181)
(Ab)
"A method and apparatus for delivering a mobile terminated call to user equipment (UE) in a circuit switched fall back (CSFB) capable wireless network system using prepaging. When the visiting mobile switching center (VMSC) registered in the home location register (HLR) of the called（着呼側；＊着側）UE receives a provide roaming message (PRN) from the HLR indicating that a CS call to the UE has been originated（生じている）at a gateway mobile switching center (GMSC), the VMSC starts a paging process with a mobility management entity (MME) then returns a mobile station roaming number (MSRN) to the HLR when it receives a SGs service request indicating that the called UE is in EMM-connected mode. Alternatively, the VMSC sets a guard timer in response to the SGs service request and returns the MSRN to the HLR when the guard timer expires. In the meantime, the VMSC remain in a paging stage waiting for the response from the UE falling back to the UMTS/GSM network from the LTE network."

"6. An apparatus for use in a telecommunications network for delivering a mobile terminated call from a calling（発呼側；＊発側）UE to a called UE, said apparatus configured to perform the following steps:
receiving a provide roaming number (PRN) message from a home location register (HLR) associated with the called UE when the mobile terminated call is originated;
sending a paging request to a mobility management entity (MME) said paging request causing said MME to start paging the called UE;
receiving a SGs service request message from the MME; and
sending a mobile station roaming number (MSRN) to the HLR in a PRN acknowledge (PRN Ack) message before receiving a response to the paging request from the called UE."