Sparsed U-TDOA wireless location networks
First Claim
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1. A method for designing a sparse wireless location system (WLS) associated with a wireless communications system comprising a plurality of geographically dispersed base transceiver stations (BTSs) configured to broadcast downlink beacons to be received by mobile wireless devices, comprising:
- performing an intelligent network design process to produce the initial network design;
determining that the initial network design is affected by a downlink beacon discovery performance limiting factor;
modifying the initial network design by performing at least one of the following actions to produce an updated sparse WLS design;
deploying at least one enhanced downlink antenna;
deploying downlink interference cancellation;
determining that an Abis monitoring system (AMS) is not deployed, and then deploying at least one downlink-only location measuring unit (LMU) at an identified site; and
determining that an Abis monitoring system (AMS) is deployed, and then enabling the use of Enhanced Beacon Synchronization (EBS) and AMS-derived beacon timing functions; and
performing another iteration of the intelligent network design process with updated design specifications and determining whether another performance limiting factor affects the updated sparse WLS design.
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Abstract
In an overlay, U-TDOA-based, Wireless Location System, LMUs typically co-located with BTSs, are used to collect radio signaling both in the forward and reverse channels. Techniques are used to compensate for sparse LMU deployments where sections of the U-TDOA service area are uplink demodulation or downlink beacon discovery limited.
260 Citations
20 Claims
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1. A method for designing a sparse wireless location system (WLS) associated with a wireless communications system comprising a plurality of geographically dispersed base transceiver stations (BTSs) configured to broadcast downlink beacons to be received by mobile wireless devices, comprising:
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performing an intelligent network design process to produce the initial network design; determining that the initial network design is affected by a downlink beacon discovery performance limiting factor; modifying the initial network design by performing at least one of the following actions to produce an updated sparse WLS design; deploying at least one enhanced downlink antenna; deploying downlink interference cancellation; determining that an Abis monitoring system (AMS) is not deployed, and then deploying at least one downlink-only location measuring unit (LMU) at an identified site; and determining that an Abis monitoring system (AMS) is deployed, and then enabling the use of Enhanced Beacon Synchronization (EBS) and AMS-derived beacon timing functions; and performing another iteration of the intelligent network design process with updated design specifications and determining whether another performance limiting factor affects the updated sparse WLS design. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10)
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2. A method for designing a sparse wireless location system (WLS) to be associated with a wireless communications system comprising a plurality of geographically dispersed base transceiver stations (BTSs), comprising:
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performing an intelligent network design process to produce the initial network design; determining that the initial network design is affected by a downlink beacon discovery performance limiting factor; modifying the initial network design by performing at least one of the following actions to produce an updated sparse WLS design; deploying at least one enhanced downlink antenna; deploying downlink interference cancellation; determining that an Abis monitoring system (AMS) is not deployed, and then deploying at least one downlink-only location measuring unit (LMU) at an identified site; and determining that an Abis monitoring system (AMS) is deployed, and then enabling the use of Enhanced Beacon Synchronization (EBS) and AMS-derived beacon timing functions; performing another iteration of the intelligent network design process with updated design specifications and determining that the updated sparse WLS design is affected by an accuracy performance limiting factor, and modifying the updated sparse WLS design by performing at least one of the following actions; increasing an integration time at one or more LMUs; deploying a hybrid time difference of arrival (TDOA)/ enhanced cell identification (ECID) location process in the WLS; and deploying a hybrid TDOA/ angle of arrival (AoA) location process in the WLS.
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11. A non-transitory computer readable medium comprising computer readable instructions for carrying out a prescribed method for designing a sparse wireless location system (WLS) associated with a wireless communications system comprising a plurality of geographically dispersed base transceiver stations (BTSs) configured to broadcast downlink beacons to be received by mobile wireless devices, said prescribed method comprising:
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performing an intelligent network design process to produce the initial network design; determining that the initial network design is affected by a downlink beacon discovery performance limiting factor; modifying the initial network design by performing at least one of the following actions to produce an updated sparse WLS design; deploying at least one enhanced downlink antenna; deploying downlink interference cancellation; determining that an Abis monitoring system (AMS) is not deployed, and then deploying at least one downlink-only location measuring unit (LMU) at an identified site; determining that an Abis monitoring system (AMS) is deployed, and then enabling the use of Enhanced Beacon Synchronization (EBS) and AMS-derived beacon timing functions; and performing another iteration of the intelligent network design process with updated design specifications and determining whether another performance limiting factor affects the updated sparse WLS design. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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12. A non-transitory computer readable medium comprising computer readable instructions for carrying out a prescribed method for designing a sparse wireless location system (WLS) from an initial network design, wherein the sparse WLS is to be associated with a wireless communications system comprising a plurality of geographically dispersed base transceiver stations (BTSs), said prescribed method comprising:
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performing an intelligent network design process to produce the initial network design; determining that the initial network design is affected by a downlink beacon discovery performance limiting factor; modifying the initial network design by performing at least one of the following actions to produce an updated sparse WLS design; deploying at least one enhanced downlink antenna; deploying downlink interference cancellation; determining that an Abis monitoring system (AMS) is not deployed, and then deploying at least one downlink-only location measuring unit (LMU) at an identified site; determining that an Abis monitoring system (AMS) is deployed, and then enabling the use of Enhanced Beacon Synchronization (EBS) and AMS-derived beacon timing functions; performing another iteration of the intelligent network design process with updated design specifications and determining that the updated sparse WLS design is affected by an accuracy performance limiting factor, and modifying the updated sparse WLS design by performing at least one of the following actions; increasing an integration time at one or more LMUs; deploying a hybrid time difference of arrival (TDOA)/ enhanced cell identification (ECID) location process in the WLS; deploying a hybrid TDOA/ angle of arrival (AoA) location process in the WLS; and adding at least one LMU to the network design.
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Specification