Cooperating receiver selection for UMTS wireless location
First Claim
1. A method of identifying a set of cooperator and demodulator location measuring units (LMUs) for use in locating a mobile device in a Code Division Multiple Access (CDMA)-based wireless communications network (WCN), wherein the demodulator LMUs perform full or partial demodulation of an uplink signal from the mobile device and the cooperator LMUs receive the uplink signal from the mobile device without performing demodulation, comprising:
- obtaining data identifying an active set of base stations through which active communication is established between the mobile device and the WCN;
based on the active set, identifying at least one cooperator LMU and at least one demodulator LMU;
employing the at least one cooperator LMU and the at least one demodulator LMU to collect signal data from the mobile device; and
employing the signal data to locate the mobile device;
wherein said identifying at least one cooperator LMU and at least one demodulator LMU further comprises;
determining a representative point based on geographic information for the active set and determining a geographic area associated with the representative point; and
dividing the geographic area into radial segments and identifying the at least one cooperator LMU and the at least one demodulator LMU based on the radial segments.
2 Assignments
0 Petitions
Accused Products
Abstract
For Wireless Communications Networks (WCNs) that support soft handover, cooperator receiver selection for a TDOA, AOA, TDOA/AOA, or hybrid network-based or network-overlay Wireless Location System (WLS) must contend with one or more network base stations as a serving cell. When the active set contains more than one member, two techniques for determining a set of cooperating and demodulating receivers to use in the signal collection for location estimation is disclosed. In one embodiment, the active set members are constructively reduced to a single member that is used as a proxy serving cell. In another embodiment, the information contained in the active set membership is retained and a new set of demodulating and cooperator receivers are generated based on the entire membership of the active set.
32 Citations
22 Claims
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1. A method of identifying a set of cooperator and demodulator location measuring units (LMUs) for use in locating a mobile device in a Code Division Multiple Access (CDMA)-based wireless communications network (WCN), wherein the demodulator LMUs perform full or partial demodulation of an uplink signal from the mobile device and the cooperator LMUs receive the uplink signal from the mobile device without performing demodulation, comprising:
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obtaining data identifying an active set of base stations through which active communication is established between the mobile device and the WCN; based on the active set, identifying at least one cooperator LMU and at least one demodulator LMU; employing the at least one cooperator LMU and the at least one demodulator LMU to collect signal data from the mobile device; and employing the signal data to locate the mobile device; wherein said identifying at least one cooperator LMU and at least one demodulator LMU further comprises; determining a representative point based on geographic information for the active set and determining a geographic area associated with the representative point; and dividing the geographic area into radial segments and identifying the at least one cooperator LMU and the at least one demodulator LMU based on the radial segments. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of identifying a set of cooperator and demodulator location measuring units (LMUs) for use in locating a mobile device in a Code Division Multiple Access (CDMA)-based wireless communications network (WCN), wherein the demodulator LMUs perform full or partial demodulation of an uplink signal from the mobile device and the cooperator LMUs receive the uplink signal from the mobile device without performing demodulation, comprising:
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obtaining data identifying an active set of base stations through which active communication is established between the mobile device and the WCN; based on the active set, identifying at least one cooperator LMU and at least one demodulator LMU; employing the at least one cooperator LMU and the at least one demodulator LMU to collect signal data from the mobile device; and employing the signal data to locate the mobile device; wherein said identifying at least one cooperator LMU and at least one demodulator LMU further comprises; determining a common coverage area for the active set and a geographic centroid for the common coverage area; and dividing the common coverage area into radial segments centered around the geographic centroid and identifying the at least one cooperator LMU and the at least one demodulator LMU based on the radial segments.
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8. A system configured to identify a set of cooperator and demodulator signal collection receivers for use in locating a mobile device in a Code Division Multiple Access (CDMA)-based wireless communications network (WCN), the system comprising at least one processor and at least one storage medium communicatively coupled to said at least one processor, the storage medium having stored therein computer-executable instructions for instructing the processor in causing the following steps:
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obtaining data identifying an active set of base stations through which active communication is established between the mobile device and the WCN; based on the active set, identifying at least one cooperator receiver and at least one demodulator receiver; employing the at least one cooperator receiver and the at least one demodulator receiver to collect signal data from the mobile device; and employing the signal data to locate the mobile device; wherein said identifying at least one cooperator receiver and at least one demodulator receiver further comprises; determining a representative point based on geographic information for the active set and determining a geographic area associated with the representative point; and dividing the geographic area into radial segments and identifying the at least one cooperator receiver and the at least one demodulator receiver based on the radial segments. - View Dependent Claims (9, 10, 11, 12)
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13. A non-transitory computer readable storage medium storing thereon computer executable instructions for identifying a set of cooperator and demodulator signal collection receivers for use in locating a mobile device in a Code Division Multiple Access (CDMA)-based wireless communications network (WCN), said computer executable instructions for:
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obtaining data identifying an active set of base stations through which active communication is established between the mobile device and the WCN; based on the active set, identifying at least one cooperator receiver and at least one demodulator receiver; employing the at least one cooperator receiver and the at least one demodulator receiver to collect signal data from the mobile device; and employing the signal data to locate the mobile device; wherein said instructions for identifying at least one cooperator receiver and at least one demodulator receiver comprise; instructions for determining a representative point based on geographic information for the active set and determining a geographic area associated with the representative point; and instructions for dividing the geographic area into radial segments and identifying the at least one cooperator receiver and the at least one demodulator receiver based on the radial segments. - View Dependent Claims (14, 15, 16, 17)
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18. A non-transitory computer readable storage medium storing thereon computer executable instructions for identifying a set of cooperator and demodulator signal collection receivers for use in locating a mobile device in a Code Division Multiple Access (CDMA)-based wireless communications network (WCN), said computer executable instructions for:
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obtaining data identifying an active set of base stations through which active communication is established between the mobile device and the WCN; based on the active set, identifying at least one cooperator receiver and at least one demodulator receiver; employing the at least one cooperator receiver and the at least one demodulator receiver to collect signal data from the mobile device; and employing the signal data to locate the mobile device; wherein said instructions for identifying at least one cooperator receiver and at least one demodulator receiver comprise; instructions for determining a common coverage area for the active set and a geographic centroid for the common coverage area; and instructions for dividing the common coverage area into radial segments centered around the geographic centroid and identifying the at least one cooperator receiver and the at least one demodulator receiver based on the radial segments. - View Dependent Claims (19, 20, 21)
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22. A system configured to identify a set of cooperator and demodulator signal collection receivers for use in locating a mobile device in a Code Division Multiple Access (CDMA)-based wireless communications network (WCN), the system comprising at least one processor and at least one storage medium communicatively coupled to said at least one processor, the storage medium having stored therein computer-executable instructions for instructing the processor in causing the following steps:
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obtaining data identifying an active set of base stations through which active communication is established between the mobile device and the WCN; based on the active set, identifying at least one cooperator receiver and at least one demodulator receiver; employing the at least one cooperator receiver and the at least one demodulator receiver to collect signal data from the mobile device; and employing the signal data to locate the mobile device; wherein said identifying at least one cooperator receiver and at least one demodulator receiver further comprises; determining a common coverage area for the active set and a geographic centroid for the common coverage area; and dividing the common coverage area into radial segments centered around the geographic centroid and identifying the at least one cooperator receiver and the at least one demodulator receiver based on the radial segments.
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Specification