Femtocell calibration for timing based locating systems
First Claim
1. A system, comprising:
- a processor; and
a memory that stores executable instructions that, when executed by the processor, facilitate performance of operations, comprising;
determining a timing calibration parameter for a macrocell device based on a variation between a first measured time difference between the macrocell device and a first mobile device and a first projected time difference between the macrocell device and a femtocell access point device within communication range of the first mobile device; and
determining a location of a second mobile device based on the timing calibration parameter and a second measured time difference between the macrocell device and the second mobile device.
1 Assignment
0 Petitions
Accused Products
Abstract
A femtocell calibration solution is provided that uses the known location of the femtocell to calibrate timing based locating systems. The calculated time differences of different signals sent between macrocells and a mobile device can be used to solve for a reference time difference that accounts for the timing differences of the unsynchronized macrocells. The reference time difference can then be used to solve for the location of another mobile device if the calculated time differences between that mobile device and the macrocells are known. The solution can include taking many measurements of the calculated time difference at the first mobile device in order to average them to get a more accurate reference time difference. The solution can further include ceasing measurements at the first mobile device when the mobile device is no longer within range of the femtocell.
-
Citations
20 Claims
-
1. A system, comprising:
-
a processor; and a memory that stores executable instructions that, when executed by the processor, facilitate performance of operations, comprising; determining a timing calibration parameter for a macrocell device based on a variation between a first measured time difference between the macrocell device and a first mobile device and a first projected time difference between the macrocell device and a femtocell access point device within communication range of the first mobile device; and determining a location of a second mobile device based on the timing calibration parameter and a second measured time difference between the macrocell device and the second mobile device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A method, comprising:
-
receiving, by a system comprising a processor, report information representing a radio resource control measurement report from a first mobile device that comprises timing measurements between macrocell devices and the first mobile device; determining, by the system, respective timing calibration parameters for the macrocell devices based on a variation between the timing measurements and projected time differences between the macrocell devices and a femtocell access point device determined to be within range of the first mobile device; and determining, by the system, a location of a second mobile device based on the timing calibration parameters and measured time differences between the macrocell devices and the second mobile device. - View Dependent Claims (12, 13, 14, 15, 16, 17)
-
-
18. A computer-readable storage device, comprising executable instructions that, in response to execution, cause a device comprising a processor to perform operations, comprising:
-
receiving a first set of calculated time differences between a first mobile device and macrocell devices within a defined range of the first mobile device; determining reference time differences for the macrocell devices based on location information received from a femtocell device and the calculated time differences, wherein the reference time differences are respective timing offsets for the macrocell devices relative to a baseline time; and determining a location of a second mobile device as a function of the reference time differences and a second set of calculated time differences between the second mobile device and the macrocell devices. - View Dependent Claims (19, 20)
-
Specification