Sparsed U-TDOA wireless location networks
First Claim
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1. A computer-implemented, iterative method for designing a sparse wireless location system (WLS) from an initial network design stored on a non-transitory computer readable medium, wherein the sparse WLS is designed to be overlaid on a wireless communications system, comprising:
- performing an intelligent WLS network design process to produce an initial network design;
accessing said initial network design from the non-transitory computer readable medium;
performing a preliminary network design analysis to determine that at least one of the following performance limiting factors affects said initial network design;
downlink beacon discovery and uplink demodulation; and
modifying the initial network design based on the performance limiting factor determined as affecting said initial network design, wherein said modifying comprises the following;
(1) when the performance limiting factor is downlink beacon discovery, one or more of the following modifications is performed;
deploying at least one enhanced downlink antenna;
deploying downlink interference cancellation;
deploying base transceiver station (BTS) synchronization;
adding at least one location measuring unit (LMU) to the network design;
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;
(2) when the performance limiting factor is uplink demodulation, one or more of the following modifications is performed;
determining that communications system demodulation data is enabled, and enabling a demodulated data feature;
determining that communications system demodulation data is not enabled, and determining that an Abis monitoring system (AMS) is not deployed and enabling a mid-amble only correction feature;
determining that communications system demodulation data is not enabled, and determining that an Abis monitoring system (AMS) is deployed and enabling an AMS-derived demodulated data feature;
adding at least one location measuring unit (LMU) to the network design;
adding at least one dedicated antenna facility to the network design; and
saving the modified network design on the non-transitory computer readable medium.
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Accused Products
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.
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Citations
33 Claims
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1. A computer-implemented, iterative method for designing a sparse wireless location system (WLS) from an initial network design stored on a non-transitory computer readable medium, wherein the sparse WLS is designed to be overlaid on a wireless communications system, comprising:
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performing an intelligent WLS network design process to produce an initial network design; accessing said initial network design from the non-transitory computer readable medium; performing a preliminary network design analysis to determine that at least one of the following performance limiting factors affects said initial network design;
downlink beacon discovery and uplink demodulation; andmodifying the initial network design based on the performance limiting factor determined as affecting said initial network design, wherein said modifying comprises the following; (1) when the performance limiting factor is downlink beacon discovery, one or more of the following modifications is performed; deploying at least one enhanced downlink antenna; deploying downlink interference cancellation; deploying base transceiver station (BTS) synchronization; adding at least one location measuring unit (LMU) to the network design; 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; (2) when the performance limiting factor is uplink demodulation, one or more of the following modifications is performed; determining that communications system demodulation data is enabled, and enabling a demodulated data feature; determining that communications system demodulation data is not enabled, and determining that an Abis monitoring system (AMS) is not deployed and enabling a mid-amble only correction feature; determining that communications system demodulation data is not enabled, and determining that an Abis monitoring system (AMS) is deployed and enabling an AMS-derived demodulated data feature; adding at least one location measuring unit (LMU) to the network design; adding at least one dedicated antenna facility to the network design; and saving the modified network design on the non-transitory computer readable medium. - 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 software tool stored on a non-transitory computer readable medium, comprising computer readable instructions for carrying out an iterative method for designing a sparse uplink time difference of arrival (U-TDOA) wireless location system (WLS) including a plurality of geographically dispersed location measuring units (LMUs), wherein said WLS is overlaid on a GSM wireless communications system comprising a plurality of geographically dispersed base transceiver stations (BTSs), said iterative method comprising:
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accessing an initial network design from the non-transitory computer readable medium; determining that at least one of the following performance limiting factors affects said initial network design;
downlink beacon discovery, accuracy, and uplink demodulation; andmodifying the initial network design based on the performance limiting factor determined as affecting said initial network design, wherein said modifying comprises the following; (1) when the performance limiting factor is accuracy, one or more of the following modifications is performed; increasing an integration time at one or more location measuring units (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; (2) when the performance limiting factor is downlink beacon discovery, one or more of the following modifications is performed; deploying at least one enhanced downlink antenna; deploying downlink interference cancellation; deploying base transceiver station (BTS) synchronization; adding at least one location measuring unit (LMU) to the network design; 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; (3) when the performance limiting factor is uplink demodulation, one or more of the following modifications is performed; determining that communications system demodulation data is enabled, and enabling a demodulated data feature; determining that communications system demodulation data is not enabled, and determining that an Abis monitoring system (AMS) is not deployed and enabling a mid-amble only correction feature; determining that communications system demodulation data is not enabled, and determining that an Abis monitoring system (AMS) is deployed and enabling an AMS-derived demodulated data feature; adding at least one location measuring unit (LMU) to the network design; adding at least one dedicated antenna facility to the network design; and saving the modified network design on the non-transitory computer readable medium. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. An iterative method for designing a sparse wireless location system (WLS) based on an initial network design, wherein said WLS comprises an uplink time difference of arrival (U-TDOA) system including a plurality of geographically dispersed location measuring units (LMUs) and said WLS is overlaid on a GSM wireless communications system comprising a plurality of geographically dispersed base transceiver stations (BTSs), comprising:
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(a) performing a preliminary network design analysis to determine that at least one of the following performance limiting factors affects said initial network design;
downlink beacon discovery, accuracy, and uplink demodulation; and(b) modifying the initial network design based on the performance limiting factor determined as affecting the initial network design, wherein said modifying comprises the following; (1) when the performance limiting factor is accuracy, one or more of the following modifications is performed; increasing an integration time at one or more location measuring units (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; (2) when the performance limiting factor is downlink beacon discovery, one or more of the following modifications is performed; deploying at least one enhanced downlink antenna; deploying downlink interference cancellation; deploying base transceiver station (BTS) synchronization; adding at least one location measuring unit (LMU) to the network design; 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; (3) when the performance limiting factor is uplink demodulation, one or more of the following modifications is performed; determining that communications system demodulation data is enabled, and enabling a demodulated data feature; determining that communications system demodulation data is not enabled, and determining that an Abis monitoring system (AMS) is not deployed and enabling a mid-amble only correction feature; determining that communications system demodulation data is not enabled, and determining that an Abis monitoring system (AMS) is deployed and enabling an AMS-derived demodulated data feature; adding at least one location measuring unit (LMU) to the network design; and adding at least one dedicated antenna facility to the network design.
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Specification