Geolocation using enhanced timing advance techniques
First Claim
Patent Images
1. A method of determining a location of a mobile-station comprising the steps of:
- forming a first timing advance belt using a first timing advance value associated with a first serving base station;
forming a second timing advance belt using a second timing advance value associated with a second serving base station;
determining the location of the mobile-station using the first and second timing advance belts, wherein if the first and second timing advance belts intersect at two points and only one point of intersection lies within a constraint polygon formed using signal strength measurements, the location of the mobile-station is determined to be approximately at the one point of intersection that lies within the constraint polygons, or wherein if the first and second timing advance belts intersect at two points and both points of intersection lies within a constraint polygon formed using signal strength measurements, the location of the mobile-station is determined to be approximately at an average of the two points of intersection.
3 Assignments
0 Petitions
Accused Products
Abstract
A method of geolocation that is backward compatible and more accurate than the well-known Cell/Sector ID method is provided. The geolocation method provided comprises the steps of determining a set of candidate locations for the mobile-station based on a timing advance value associated with the mobile-station and determining a location of the mobile-station using the set of candidate locations and signal strength measurements associated with same cell-neighboring sectors or different cell-neighboring sectors.
-
Citations
17 Claims
-
1. A method of determining a location of a mobile-station comprising the steps of:
-
forming a first timing advance belt using a first timing advance value associated with a first serving base station;
forming a second timing advance belt using a second timing advance value associated with a second serving base station;
determining the location of the mobile-station using the first and second timing advance belts, wherein if the first and second timing advance belts intersect at two points and only one point of intersection lies within a constraint polygon formed using signal strength measurements, the location of the mobile-station is determined to be approximately at the one point of intersection that lies within the constraint polygons, or wherein if the first and second timing advance belts intersect at two points and both points of intersection lies within a constraint polygon formed using signal strength measurements, the location of the mobile-station is determined to be approximately at an average of the two points of intersection. - View Dependent Claims (2, 3)
-
-
4. A method of determining a location of a mobile-station comprising the steps of:
-
determining a set of candidate locations for the mobile-station based on a timing advance value associated with the mobile-station;
determining a location of the mobile-station using the set of candidate locations and signal strength measurements associated with same cell-neighboring sectors or different cell-neighboring sectors, wherein the location of the mobile-station is determined to be approximately at a candidate location defined by an intersection of a timing advance belt and a center divider of a serving sector when there are no non-negligible signal strength measurements associated with any same cell-neighboring sector or when there are non-negligible signal strength measurements associated with two same cell-neighboring sectors. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
-
-
5. A method of determining a location of a mobile-station comprising the steps of:
-
determining a set of candidate locations for the mobile-station based on a timing advance value associated with the mobile-station;
determining a location of the mobile-station using the set of candidate locations and signal strength measurements associated with same cell-neighboring sectors or different cell-neighboring sectors, wherein the location of the mobile-station is determined to be approximately at a candidate location defined by an intersection of a timing advance belt and a sector divider of a serving sector and a same cell-neighboring sector associated with a non-negligible signal strength measurement when there is only one same cell-neighboring sector associated with a non-negligible signal strength measurement.
-
Specification