Mid-call synchronization for U-TDOA and AOA location in UMTS
First Claim
1. In a wireless location system (WLS) for use in locating a mobile transmitter, a method for determining frame and slot timing information for use in receiving an uplink signal from a user equipment device (UE) assigned to an uplink Dedicated Physical Control Channel (DPCCH), comprising:
- receiving uplink DPCCH signals in the uplink DPCCH at a location measurement unit (LMU) of the WLS, said uplink DPCCH signals being formatted into multiple frames and multiple slots per frame;
detecting a predefined bit pattern known to be present in a plurality of predefined slots of the uplink DPCCH signals;
examining the DPCCH signals across multiple frames;
determining the frame and slot timing information for the uplink DPCCH based on the detected bit pattern; and
using the frame and slot timing information, collecting uplink signals from the UE for use in location processing.
2 Assignments
0 Petitions
Accused Products
Abstract
In a wireless location system, a method for determining frame and slot timing information for use in receiving an uplink signal from a user equipment (UE) device assigned to an uplink Dedicated Physical Control Channel (DPCCH) includes receiving signals in the uplink DPCCH at a location measurement unit (LMU) of the WLS. The method also includes detecting a predefined bit pattern known to be present in a plurality of predefined slots of the uplink DPCCH. Next, the frame and slot timing information are determined for the uplink DPCCH based on the detected bit pattern. Finally, the frame and slot timing information is used for collecting uplink signals from the UE for use in location processing.
12 Citations
22 Claims
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1. In a wireless location system (WLS) for use in locating a mobile transmitter, a method for determining frame and slot timing information for use in receiving an uplink signal from a user equipment device (UE) assigned to an uplink Dedicated Physical Control Channel (DPCCH), comprising:
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receiving uplink DPCCH signals in the uplink DPCCH at a location measurement unit (LMU) of the WLS, said uplink DPCCH signals being formatted into multiple frames and multiple slots per frame; detecting a predefined bit pattern known to be present in a plurality of predefined slots of the uplink DPCCH signals; examining the DPCCH signals across multiple frames; determining the frame and slot timing information for the uplink DPCCH based on the detected bit pattern; and using the frame and slot timing information, collecting uplink signals from the UE for use in location processing. - View Dependent Claims (2, 3, 4, 5, 11)
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6. A wireless location system (WLS) for use in locating a mobile transmitter, comprising:
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a network of location measurement units (LMUs); and a processor configured to cause the system to determine frame and slot timing information for use in receiving an uplink signal from a user equipment device (UE) assigned to an uplink Dedicated Physical Control Channel (DPCCH), including receiving signals in the uplink DPCCH at a first LMU, said signals being formatted into multiple frames and multiple slots per frame;
detecting a predefined bit pattern known to be present in a plurality of predefined slots of the uplink DPCCH;
examining the signals across multiple frames;
determining the frame and slot timing information for the uplink DPCCH based on the detected bit pattern; and
using the frame and slot timing information to collect uplink signals from the UE for use in location processing. - View Dependent Claims (7, 8, 9, 10, 12)
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13. A method for use by a wireless location system (WLS) in locating a user equipment device (UE) communicating via a wireless communications system configured in accordance with Universal Mobile Telephone System (UMTS) technical specifications, comprising:
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receiving a task to locate said UE mid-call, wherein said task is received following a process in which a Node B element of the UMTS provides timing information via a broadcast channel;
said UE performs a cell search and accesses the UMTS via a reverse access channel (RACH);
the Node B element determines fine timing information from a long pilot sequence; and
the UE converses with the UMTS using a Dedicated Physical Control Channel (DPCCH) and a Dedicated Physical Data Channel (DPDCH);receiving uplink DPCCH signals from said UE; detecting a predefined bit pattern known to be present in a plurality of predefined slots of the uplink DPCCH signals; performing a multi-frame examination of the DPCCH signals; determining frame and slot timing information for the DPCCH based on the detected bit pattern, wherein said frame and slot timing information includes a start time for each frame and slot; collecting uplink signals from said UE via a network of location measurement units (LMUs); and determining the location of said UE using the uplink signals collected by said LMUs. - View Dependent Claims (14, 15, 16, 17)
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18. A wireless location system (WLS) for use in locating a user equipment device (UE) communicating via a wireless communications system configured in accordance with Universal Mobile Telephone System (UMTS) technical specifications, comprising:
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a network of location measurement units (LMUs); and a processor configured to cause the system to; receive a task to locate said UE mid-call, wherein said task is received following a process in which a Node B element of the UMTS provides timing information via a broadcast channel;
said UE performs a cell search and accesses the UMTS via a reverse access channel (RACH);
the Node B element determines fine timing information from a long pilot sequence; and
the UE converses with the UMTS using a Dedicated Physical Control Channel (DPCCH) and a Dedicated Physical Data Channel (DPDCH);receive uplink DPCCH signals from said UE; detect a predefined bit pattern known to be present in a plurality of predefined slots of the uplink DPCCH signals; perform a multi-frame examination of the DPCCH signals; determine frame and slot timing information for the DPCCH based on the detected bit pattern, wherein said frame and slot timing information includes a start time for each frame and slot; collect uplink signals from said UE via the network of LMUs; and determine the location of said UE using the uplink signals collected by said LMUs. - View Dependent Claims (19, 20, 21, 22)
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Specification