Mobile termination roaming forwarding for mobile devices
AssigneeAlcatel Lucent
InventorsLu Tian, Richard Ejzak
Life of this patent
Estimating the term…
Abstract
A method for delivering a mobile terminated call to a mobile device communicating with a mobile switching center (MSC) in one example comprises steps of attempting to deliver the mobile terminated call to a mobile device, receiving a message that the mobile device is no longer in the location area served by the visiting MSC and forwarding the mobile terminated call to a different visiting MSC. The mobile terminated call is forwarded directly from one VMSC to another VMSC without requiring two potentially international calls to be placed serially from the GMSC to a VMSC. This method of Mobile Termination Roaming Forwarding can reduce substantial delay in call setup while saving network resources during establishment of the first call.
Claims12
A method for delivering a mobile terminated call to a mobile device, said method, performed by a VMSC/VLR (visiting mobile switching center/visiting location register), comprising the steps of:
- receiving an initial address message (IAM) for the mobile device from a gateway mobile switching center (GMSC);
- paging the mobile device that is referenced by the IAM;
- receiving a cancel location message from the home location register (HLR) assigned to the mobile device, the cancel location message including a mobile termination roaming forwarding (MTRF) flag and addresses of a new VMSC/VLR;
- sending a provide roaming number (PRN) message with a MTRF flag to the new VMSC/VLR;
- receiving a PRN Response message from the new VMSC/VLR;
- and
- forwarding the IAM to the new VMSC/VLR.
A VMSC/VLR (visiting mobile switching center/visiting location register) for use in a telecommunications network for delivering a mobile terminated call to a mobile device, said VMSC/VLR configured to perform the following steps:
- receiving an initial address message (IAM) for the mobile device from a gateway mobile switching center (GMSC);
- paging the mobile device that is referenced by the IAM;
- receiving a cancel location message from the home location register (HLR) assigned to the mobile device, the cancel location message including a mobile termination roaming forwarding (MTRF) flag and addresses of a new VMSC/VLR;
- sending a provide roaming number (PRN) message with a MTRF flag to the new VMSC/VLR;
- receiving a PRN Response message from the new VMSC/VLR;
- and
- forwarding the IAM to the new VMSC/VLR.
Dependencies are inferred from the claim text.