Method and apparatus for rerouting terminations for CALEA targets through a predetermined surveilling MSC
AssigneeLucent Technologies Inc.
InventorsRuth Schaefer Gayde, Douglas Harvey Riley
Life of this patent
Estimating the term…
Abstract
A system and method is provided for surveilling call terminations to a roaming mobile in a wireless telecommunications network in which Location Request Queries (LRQs) for the target mobile can be sent from any MSC in the network. The system and method include forcing the path of the target mobile's call terminations through a predetermined Target Intercept Access Point (TIAP) for surveillance while meeting CALEA constraints including the requirement that information about surveillance may not be shared over public interfaces.
Claims18
A method of forcing the path of call terminations for a roaming surveillance target mobile through a predetermined Target Intercept Access Point (TIAP) for surveillance in a wireless telecommunications network, the method comprising:
- provisioning the target mobile's Home Location Register (HLR) with a TIAP identifier;
- determining that a Location Request Query (LRQ) sent by a Location Requesting MSC (LRMSC) to the target mobile's HLR does not come from the TIAP;
- determining that the target mobile is not registered at the TIAP;
- allocating a Temporary Roaming Routing Number (TRRN) at the TIAP and noting it as being used for surveillance of the target;
- establishing a call leg between the LRMSC and the TIAP;
- establishing a surveillance configuration for surveilling the call termination;
- sending a LRQ from the TIAP to the target mobile's HLR;
- determining that the LRQ sent from the TIAP is for a surveillance target mobile;
- determining that the LRQ sent from the TIAP is coming from an MSC that is a non-serving TIAP for the target;
- and
- establishing a call leg between the TIAP and the MSC serving the target mobile.
A system for forcing call terminations for a roaming surveillance target mobile through a predetermined Target Intercept Access Point (TIAP) for surveillance in a wireless telecommunications network comprising:
- a Location Requesting Mobile Switching Center (LRMSC) sending a Location Request Query (LRQ) for obtaining routing information for the mobile call termination at the target's mobile;
- a TIAP Mobile Switching Center for allocating a Temporary Roaming Routing Number (TRRN) and noting that the TRRN is being used for surveillance of the target mobile;
- and
- a Home Location Register (HLR) for the target mobile provisioned with a TIAP Identifier uniquely identifying the TIAP in the network and surveillance information identifying the target mobile as a surveillance target, the HLR determining that a LRQ sent from the LRMSC is not from the TIAP and determining that a LRQ sent from the TIAP is for a surveillance target mobile sent from a non-serving TIAP for the target mobile.
A method for surveilling a roaming surveillance target mobile in a wireless telecommunications network wherein Location Request Queries (LRQs) for the target mobile can be sent from any MSC in the network, the method comprising:
- provisioning the target mobile Home Location Register (HLR) with a Target Intercept Access Point (TIAP) identifier uniquely identifying the TIAP;
- determining that an LRQ sent by a Location Requesting MSC (LRMSC) to the target mobile's HLR does not come from the TIAP;
- determining that the target mobile is not registered at the TIAP;
- determining that an LRQ sent from the TIAP is for a surveillance target mobile;
- determining that the LRQ sent from the TIAP is coming from an MSC that is a non-serving TIAP for the target;
- and
- forcing call terminations for the roaming surveillance target mobile through TIAP for surveillance.
Dependencies are inferred from the claim text.