System and method for locating a mobile station in a wireless network
AssigneeSamsung Electronics Co., Ltd.
InventorPurva R. Rajkotia
Life of this patent
Estimating the term…
Abstract
A system and method is disclosed for locating a mobile station in a wireless network. A distance unit associated with a base station determines a one way travel time of a range signal from the base station to the mobile station and multiplies the one way travel time by the speed of light to obtain the distance from the base station to the mobile station. The one way travel time is equal to one half of a quantity that is equal to a two way travel time of a range signal minus a time value of a random backoff parameter of the mobile station. The distance resolution of the system is approximately two hundred forty four meters.
Claims30
For use in wireless network communications system comprising a plurality of base stations and a plurality of mobile stations, an apparatus for determining a distance from a base station to a mobile station, said apparatus comprising:
- a distance unit associated with said base station wherein said distance unit is capable of determining a one way travel time D of a signal from said base station to said mobile station;
- and
- wherein said distance unit is capable of multiplying said one way travel time D by the speed of light to obtain said distance from said base station to said mobile station.
A wireless network communications system comprising a base station and a mobile station, said base station comprising an apparatus for determining a distance from said base station to said mobile station, said apparatus comprising:
- a distance unit associated with said base station wherein said distance unit is capable of determining a one way travel time D of a signal from said base station to said mobile station;
- and
- wherein said distance unit is capable of multiplying said one way travel time D by the speed of light to obtain said distance from said base station to said mobile station.
For use in wireless network communications system comprising a base station and a mobile station, a method of determining a distance from said base station to said mobile station comprising the steps of:
- determining with a distance unit associated with said base station a one way travel time D of a signal from said base station to said mobile station;
- and
- multiplying said one way travel time D by the speed of light to obtain said distance from said base station to said mobile station.
For use in wireless network communications system comprising a plurality of base stations and a plurality of mobile stations, a method for locating a mobile station in an area between three base stations, said method comprising the steps of:
- determining with a distance unit associated with each of said three base stations a one way travel time D of a signal from each respective station to said mobile station where
- 5 D = 1 2 [ ( two way travel time ) - ( random backoff ) ]
- wherein said two way travel time is a time of travel for a range signal to travel from each respective base station to said mobile station and to travel from said mobile station to each respective base station;
- wherein said random backoff is a time value of a chip length of a random backoff parameter of said mobile station;
- multiplying each respective one way travel time D by the speed of light to obtain each respective distance from each respective base station to said mobile station;
- and
- identifying a location of said mobile station within said area between said three base stations using said respective distances of said mobile station from said respective base stations.
For use in wireless network communications system comprising a plurality of base stations and a plurality of mobile stations, an apparatus for locating a mobile station in an area between three base stations, said apparatus comprising:
- a distance unit associated with each of said three base stations wherein said distance unit is capable of determining a one way travel time D of a signal from each respective station to said mobile station where
- 6 D = 1 2 [ ( two way travel time ) - ( random backoff ) ]
- wherein said two way travel time is a time of travel for a range signal to travel from each respective base station to said mobile station and to travel from said mobile station to each respective base station;
- wherein said random backoff is a time value of a chip length of a random backoff parameter of said mobile station;
- wherein said distance unit is capable of multiplying each respective one way travel time D by the speed of light to obtain each respective distance from each respective base station to said mobile station;
- and
- wherein said distance unit is capable of identifying a location of said mobile station within said area between said three base stations using said respective distances of said mobile station from said respective base stations.
Dependencies are inferred from the claim text.