Location determination in wireless communication systems
First Claim
Patent Images
1. A method, comprising:
- configuring a transmission plan for a downlink location based services (D-LBS) zone based at least in part on resources available for transmission of location beacons, wherein the transmission plan comprises a pseudorandom transmission plan that assigns different base stations for transmission on different resources of the D-LBS zone to perform measurements of signal location parameters from multiple base stations or relay stations, or combinations thereof, of a network;
setting a pseudorandom number generator to an initial value that depends on a cell identification if a superframe or a frame count is zeroed;
for subsequently allocated D-LBS zones, calculating a recursion using the pseudorandom number generator and an initial cell identification value of the station;
transmitting configuration parameters for the D-LBS zone from said configuring; and
transmitting one or more location beacon signals on an assigned resource of the D-LBS zone based at least in part on the calculated recursion value.
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Abstract
Briefly, in accordance with one or more embodiments, a mobile station receives a location beacon transmitted from multiple base stations based on a transmission plan for a predefined downlink location based services zone in the superframes of a signal frame structure. The transmission plan includes spreading transmissions of the location beacon that are unique to respective base stations. The mobile station identifies the base stations based on the respective location beacons and the transmission plan. The mobile station identifies a present location based on the location beacons and the identities of the base stations that from which the location beacons were received.
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Citations
27 Claims
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1. A method, comprising:
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configuring a transmission plan for a downlink location based services (D-LBS) zone based at least in part on resources available for transmission of location beacons, wherein the transmission plan comprises a pseudorandom transmission plan that assigns different base stations for transmission on different resources of the D-LBS zone to perform measurements of signal location parameters from multiple base stations or relay stations, or combinations thereof, of a network; setting a pseudorandom number generator to an initial value that depends on a cell identification if a superframe or a frame count is zeroed; for subsequently allocated D-LBS zones, calculating a recursion using the pseudorandom number generator and an initial cell identification value of the station; transmitting configuration parameters for the D-LBS zone from said configuring; and transmitting one or more location beacon signals on an assigned resource of the D-LBS zone based at least in part on the calculated recursion value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method, comprising:
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receiving a location beacon transmitted from multiple base stations based at least in part on a transmission plan for a downlink location based services zone (D-LBS) in a signal subframe, frame or superframe structure, or combinations thereof, wherein the transmission plan comprises a pseudorandom transmission plan that includes spreading transmissions of the location beacon that are unique to respective base stations; partitioning a set of location beacons into a number of groups based at least in part on a number of resources available in the downlink location based services zone (D-LBS); reproducing the transmission plan at a receiver side to identify on which resources candidate base stations of the D-LBS zone transmit location beacons and to perform measurement of signal location parameters for a set of neighboring base station; identifying the base stations based at least in part on the respective location beacons and the transmission plan and based at least in art on matching a cell identification of a base station of a corresponding D-LBS zone resource on which a location beacon was received; measuring signal location parameters of the identified base stations; and identifying a present location based at least in part on the location beacons and the identities of the base stations from which the location beacons were received. - View Dependent Claims (19, 20, 21, 22)
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23. An article of manufacture comprising a non-transitory storage medium having instructions stored thereon that, if executed, result in:
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configuring a transmission plan for a downlink location based services (D-LBS) zone based at least in part on resources available for transmission of location beacons, wherein the transmission plan comprises a pseudorandom transmission plan that assigns different base stations for transmission on different resources of the D-LBS zone to perform measurements of signal location parameters from multiple base stations or relay stations, or combinations thereof, of a network; setting a pseudorandom number generator to an initial value that depends on a cell identification if a superframe or a frame count is zeroed; for subsequently allocated D-LBS zones, calculating a recursion using the pseudorandom number generator and an initial cell identification value of the station; transmitting configuration parameters for the D-LBS zone from said configuring; and transmitting one or more location beacon signals on an assigned resource of the D-LBS zone based at least in part on the calculated recursion value. - View Dependent Claims (24)
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25. An information-handling system, comprising:
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a processor and a memory coupled to the processor, wherein instructions in the memory configure the processor to; receive a location beacon transmitted from multiple base stations based at least in part on a transmission plan for a downlink location based services zone (D-LBS) in a signal subframe, frame or superframe structure, or combinations thereof, wherein the transmission plan comprises a pseudorandom transmission plan that includes spreading transmissions of the location beacon that are unique to respective base stations; partition a set of location beacons into a number of groups based at least in part on a number of resources available in the downlink location based services zone (D-LBS); reproduce the transmission plan at a receiver side to identify on which resources candidate base stations of the D-LBS zone transmit location beacons and perform measurement of signal location parameters for a set of neighboring base station; identify the base stations based at least in part on the respective location beacons and the transmission plan; measure signal location parameters of the identified base stations; and identify a present location based at least in part on the location beacons and the identities of the base stations from which the location beacons were received.
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26. A method, comprising:
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configuring a transmission plan for a downlink location based services (D-LBS) zone based at least in part on resources available for transmission of location beacons, wherein the transmission plan partitions a set of location beacons into a number of groups based on a number of resources available in the downlink location based services zone, assigns different base stations for transmission on different resources of the D-LBS zone to perform measurements of signal location parameters from multiple base stations or relay stations, or combinations thereof, of a network, and assigns a location a beacon that belongs to particular station for transmission on a particular resource of the D-LBS zone using a cell identification number of that station; transmitting configuration parameters for the D-LBS zone from said configuring; and transmitting one or more location beacon signals on an assigned resource of the D-LBS zone in accordance with the D-LBS zone transmission plan if the cell identification of the station matches the station in the transmission plan.
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27. A method, comprising:
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receiving a location beacon transmitted from multiple base stations based at least in part on a transmission plan for a downlink location based services zone (D-LBS) in a signal subframe, frame or superframe structure, or combinations thereof, wherein the transmission plan includes spreading transmissions of the location beacon that are unique to respective base stations, and comprises partitioning a set of location beacons into a number of groups based at least in part on a number of resources available in the downlink location based services zone (D-LBS), and reproducing the transmission plan at the receiver side to identify on which resources candidate base stations of the D-LBS zone transmit location beacons and to perform measurement of signal location parameters for the set of advertised neighboring base station; identifying the base stations based at least in part on matching a cell identification of a base station of a corresponding D-LBS zone resource on which a location beacon was received; measuring signal location parameters of the identified base stations; and identifying a present location based at least in part on the location beacons and the identities of the base stations from which the location beacons were received.
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Specification