System and method for positioning a mobile station using two base stations
AssigneeEricsson Inc.
InventorChristopher Hugh Kingdon
Life of this patent
Estimating the term…
Abstract
A system and method are provided for determining the location or position of a mobile station (MS) within a digital wireless network when only two base stations are available for time of arrival or other triangulation measurements. A call setup is initiated concurrently with the gathering of timing advance or other such location data on the targeted MS, thereby allowing cell sector information to be collected. This data, along with the locating data, is then reported to a Master Positioning Center where distance calculations are made from the locating data. Positional ambiguities are then resolved with a comparison to the serving cell identity recovered during the call placement to the mobile when the locating data was being taken.
Claims33
A telecommunications system for determining the location of a mobile station therein, said telecommunications system comprising:
- a serving base transceiver station in radio communication with said mobile station, said mobile station having a call connection through said serving base transceiver station;
- a second base transceiver station in radio communication with said mobile station;
- and
- positioning means for positioning said mobile station within said telecommunications system using location data and resolving positional ambiguities using cell-related area information associated with said call connection, said location data comprising serving location data from said serving base transceiver station and other location data from said second base transceiver station.
In a telecommunications system, a method for determining the location of a mobile station therein, said method comprising the steps of:
- requesting a location update on said mobile station;
- retrieving, from a serving base transceiver station in communication with said mobile station, serving location data and cell-related area information on the location of said mobile station, said mobile station having a call connection through said serving base transceiver station;
- retrieving, from a second base transceiver station in communication with said mobile station, other location data on the location of said mobile station;
- and
- determining, from location data on said mobile station, the location of said mobile station within said telecommunications system, said location data including said serving location data from said serving base transceiver station and said other location data from said second base transceiver station, said retrieved cell-related area information being used to resolve positional ambiguities during said step of determining.
A telecommunications system for determining the position of a mobile station, said telecommunications system comprising:
- means for requesting a location update on said mobile station;
- means for retrieving, from a serving base transceiver station in communication with said mobile station, serving location data and cell-related area information of the location of said mobile station, said mobile station having a call connection through said serving base transceiver station;
- means for retrieving, from a second base transceiver station in communication with said mobile station, other location data of the location of said mobile station;
- and
- means for determining, from location data of said mobile station, the location of said mobile station within said telecommunications system, said location data comprising said serving location data from said serving base transceiver station and said other location data from said second base transceiver station, said means for determining the location of said mobile station resolving positional ambiguities using the retrieved cell-related area information.
A method for determining the position of a mobile station within a telecommunications system, said method comprising the steps of:
- receiving a positioning request for the mobile station;
- identifying a serving base transceiver station and at least one other base transceiver station;
- setting up an initial call connection to the serving base transceiver station;
- retrieving location data from the serving base transceiver station and the at least one other base transceiver station;
- retrieving, from the serving base transceiver station, geographically-related information associated with the initial call connection;
- and
- forwarding the location data and the geographically-related information to a mobile positioning center where distance calculations are determined from the location data and positional ambiguities are resolved using the geographically-related information associated with the initial call connection.
An arrangement for determining the position of a mobile station, said arrangement comprising:
- a mobile switching center (MSC);
- a mobile positioning center (MPC) in communication with said MSC for forwarding a received positioning request to said MSC;
- a base station controller (BSC) currently serving the mobile station, said BSC receives positioning instructions associated with the received positioning request from said MSC;
- and
- at least two base transceiver stations serving the mobile station that are controlled by said BSC, said at least two base transceiver stations taking time advance measurements and one of said at least two base transceiver stations initiating a call to the mobile station and retrieving cell-related area information, said time advance measurements and the cell-related area information
- at least two base transceiver stations serving the mobile station that are controlled by said BSC, said at least two base transceiver stations taking time advance measurements and one of said at least two base transceiver stations initiating a call to the mobile station and retrieving cell-related area information, said time advance measurements and the cell-related area information being sent to the MPC where distance calculations are determined from the TA measurements and position ambiguities are resolved from the cell-related area information.
Dependencies are inferred from the claim text.