US6230018B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Devices and processing in a mobile radio communication network having calibration terminals
Assignee: Apple Inc
•
Filing: 1998-05-14
•
Granted: 2001-05-08
•
Expires: 2018-05-14
Abstract
Abstract In a mobile communication network, the accuracy of location determinations for mobiles based on TDOA measurements made by the mobiles is increased by measuring the TDOA of signals from base station pairs at a known location and generating correction factors for compensating timing and propagation errors in TDOA measurements made by the mobiles. Calibration terminals may be provided for measuring TDOAs at known locations. System processes and elements for applying data generated by calibration terminals are disclosed.
Inventors
- 👤 J. Michael Watters
- 👤 Leo Strawczynski
- 👤 David Steer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:29
CPC Classifications
H; H04; H04W; H04W64/00; G; G01; G01S; G01S5/00; G01S5/02; G01S5/0205; G01S5/021; G01S5/0244; G01S5/10; G01S1/00; G01S1/02; G01S1/022; G01S2205/00; G01S2205/001; G01S2205/008
Claims Analysis
Total Claims: 82
Claim 1
Independent Claim
157 words
A process in a mobile communication network, comprising: determining an expected time difference of arrival (TDOA) at a known location for signals of at least three base station pairs of the network; determining a measured TDOA for each of said base station pairs at said known location; determining an average measured TDOA for each of the base station pairs at said known location for a period of time; determining a correction factor for each base station pair constituting the difference between the expected and average measured TDOAs; determining a measured TDOA at a location of a mobile for each of said base station pairs; for each of said base station pairs, if a TDOA at the location of the mobile differs from a corresponding TDOA at the known location by less than a predetermined amount, applying a corresponding correction factor to said measured TDOA to yield a corrected TDOA; and determining a location using said corrected TDOAs.
Claim 2
Dependent Claim
157 words
A process in a mobile communication network, comprising: determining an expected time difference of arrival (TDOA) at a known location for signals of at least three base station pairs of the network; determining a measured TDOA for each of said base station pairs at said known location; determining an average measured TDOA for each of the base station pairs at said known location for a period of time; determining a correction factor for each base station pair constituting the difference between the expected and average measured TDOAs; determining a measured TDOA at a location of a mobile for each of said base station pairs; for each of said base station pairs, if a TDOA at the location of the mobile differs from a corresponding TDOA at the known location by less than a predetermined amount, applying a corresponding correction factor to said measured TDOA to yield a corrected TDOA; and determining a location using said corrected TDOAs.
Claim 3
Dependent Claim
163 words
A mobile communication network, comprising: means for determining an expected time difference of arrival (TDOA) at a known location for signals of at least three base station pairs of the network; means for determining a measured TDOA for each of said base station pairs at said known location; means for determining an average measured TDOA for each of the base station pairs at said known location for a period of time; means for determining a correction factor for each base station pair constituting the difference between the expected and average measured TDOAs; means for determining a measured TDOA at a location of a mobile for each of said base station pairs; means for individually applying a corresponding correction factor to each measured TDOA to yield a corrected TDOA if a corresponding TDOA at the location of the mobile differs from a corresponding TDOA at the known location by less than a predetermined amount; and means for determining a location using said corrected TDOAs.
Claim 4
Dependent Claim
163 words
A mobile communication network, comprising: means for determining an expected time difference of arrival (TDOA) at a known location for signals of at least three base station pairs of the network; means for determining a measured TDOA for each of said base station pairs at said known location; means for determining an average measured TDOA for each of the base station pairs at said known location for a period of time; means for determining a correction factor for each base station pair constituting the difference between the expected and average measured TDOAs; means for determining a measured TDOA at a location of a mobile for each of said base station pairs; means for individually applying a corresponding correction factor to each measured TDOA to yield a corrected TDOA if a corresponding TDOA at the location of the mobile differs from a corresponding TDOA at the known location by less than a predetermined amount; and means for determining a location using said corrected TDOAs.
Claim 5
Dependent Claim
103 words
A process in a mobile communication network for synchronizing a base station and a reference base station, comprising: determining a measured time difference of arrival (TDOA) at a known location of a signal from a base station with respect to a signal from a reference base station; determining an expected TDOA for the base station with respect to the reference base station; determining a difference between the measured and expected TDOAs; and adjusting the timing of the base station by the amount of the difference to align a PN offset of the base station with a PN offset of the reference base station.
Claim 6
Dependent Claim
103 words
A process in a mobile communication network for synchronizing a base station and a reference base station, comprising: determining a measured time difference of arrival (TDOA) at a known location of a signal from a base station with respect to a signal from a reference base station; determining an expected TDOA for the base station with respect to the reference base station; determining a difference between the measured and expected TDOAs; and adjusting the timing of the base station by the amount of the difference to align a PN offset of the base station with a PN offset of the reference base station.
Claim 7
Dependent Claim
110 words
A mobile communication network for providing synchronization of a base station and a reference base station, comprising: means for determining a measured time difference of arrival (TDOA) at a known location of a signal from a base station with respect to a signal from a reference base station; means for determining an expected TDOA for the base station with respect to the reference base station; means for determining a difference between the measured and expected TDOAs; and means for adjusting the timing of the base station by the amount of the difference to align a PN offset of the base station with a PN offset of the reference base station.
Claim 8
Dependent Claim
110 words
A mobile communication network for providing synchronization of a base station and a reference base station, comprising: means for determining a measured time difference of arrival (TDOA) at a known location of a signal from a base station with respect to a signal from a reference base station; means for determining an expected TDOA for the base station with respect to the reference base station; means for determining a difference between the measured and expected TDOAs; and means for adjusting the timing of the base station by the amount of the difference to align a PN offset of the base station with a PN offset of the reference base station.
Claim 9
Dependent Claim
104 words
A process in a mobile communication network for synchronizing a base station and a reference base station, comprising: determining an average measured time difference of arrival (TDOA) at a known location of a signal from a base station with respect to a signal from a reference base station; determining an expected TDOA for the base station with respect to the reference base station; determining a difference between the measured and expected TDOAs; and adjusting the timing of the base station by the amount of the difference to align a PN offset of the base station with a PN offset of the reference base station.
Claim 10
Dependent Claim
104 words
A process in a mobile communication network for synchronizing a base station and a reference base station, comprising: determining an average measured time difference of arrival (TDOA) at a known location of a signal from a base station with respect to a signal from a reference base station; determining an expected TDOA for the base station with respect to the reference base station; determining a difference between the measured and expected TDOAs; and adjusting the timing of the base station by the amount of the difference to align a PN offset of the base station with a PN offset of the reference base station.
Claim 11
Dependent Claim
111 words
A mobile communication network for providing synchronization of a base station and a reference base station, comprising: means for determining an average measured time difference of arrival (TDOA) at a known location of a signal from a base station with respect to a signal from a reference base station; means for determining an expected TDOA for the base station with respect to the reference base station; means for determining a difference between the measured and expected TDOAs; and means for adjusting the timing of the base station by the amount of the difference to align a PN offset of the base station with a PN offset of the reference base station.
Claim 12
Dependent Claim
111 words
A mobile communication network for providing synchronization of a base station and a reference base station, comprising: means for determining an average measured time difference of arrival (TDOA) at a known location of a signal from a base station with respect to a signal from a reference base station; means for determining an expected TDOA for the base station with respect to the reference base station; means for determining a difference between the measured and expected TDOAs; and means for adjusting the timing of the base station by the amount of the difference to align a PN offset of the base station with a PN offset of the reference base station.
Claim 13
Dependent Claim
71 words
A process in a mobile of a mobile communication network, comprising: measuring a time difference of arrival (TDOA) at the mobile for at least three base station pairs of the network; receiving, from another element of the network, a correction factor associated with each of said base station pairs; applying said correction factors to corresponding TDOA measurements to yield corrected TDOA measurements; and determining a location from said corrected TDOA measurements.
Claim 14
Dependent Claim
71 words
A process in a mobile of a mobile communication network, comprising: measuring a time difference of arrival (TDOA) at the mobile for at least three base station pairs of the network; receiving, from another element of the network, a correction factor associated with each of said base station pairs; applying said correction factors to corresponding TDOA measurements to yield corrected TDOA measurements; and determining a location from said corrected TDOA measurements.
Claim 15
Dependent Claim
29 words
The process claimed in claim 7 , wherein receiving correction factors comprises receiving correction factor broadcasts from one or more base stations associating correction factors with base station pairs.
Claim 16
Dependent Claim
26 words
The process claimed in claim 7 , wherein receiving correction factors comprises querying a location server maintaining a database associating correction factors with base station pairs.
Claim 17
Dependent Claim
28 words
The process claimed in claim 7 , wherein receiving correction factors comprises querying at least one calibration terminal maintaining a database associating correction factors with base station pairs.
Claim 18
Dependent Claim
32 words
The process claimed in claim 7 , wherein receiving correction factors comprises receiving correction factor reports from at least one calibration terminal maintaining a database associating correction factors with base station pairs.
Claim 19
Dependent Claim
66 words
The process claimed in claim 7 , wherein receiving said correction factors comprises: receiving, from another element of the network, calibration TDOA measurements for said base station pairs made at known locations; determining expected TDOA measurements for said base station pairs at said known locations; and determining differences between said calibration TDOA measurements and expected TDOA measurements at said known locations for said base station pairs.
Claim 20
Dependent Claim
24 words
The process claimed in claim 12 , wherein receiving calibration TDOA measurements comprises querying a database associating calibration TDOA measurements with base station pairs.
Claim 21
Dependent Claim
28 words
The process claimed in claim 12 , wherein receiving calibration TDOA measurements comprises querying a location server maintaining a database associating calibration TDOA measurements with base station pairs.
Claim 22
Dependent Claim
27 words
The process claimed in claim 12 , wherein receiving calibration TDOA measurements comprises querying calibration terminals maintaining a database associating calibration TDOA measurements with base station pairs.
Claim 23
Dependent Claim
30 words
The process claimed in claim 12 , wherein receiving calibration TDOA measurements comprises receiving calibration TDOAs reported from calibration terminals maintaining a database associating correction factors with base station pairs.
Claim 24
Dependent Claim
27 words
The process claimed in claim 12 , wherein determining expected TDOA values comprises querying a database associating expected TDOA measurements with base station pairs and known locations.
Claim 25
Dependent Claim
31 words
The process claimed in claim 12 , wherein determining expected TDOA measurements comprises querying a location server maintaining a database associating expected TDOA measurements with base station pairs and known locations.
Claim 26
Dependent Claim
27 words
The process claimed in claim 12 , wherein determining expected TDOA measurements comprises querying calibration terminals maintaining a database associating expected TDOA measurements with base station pairs.
Claim 27
Dependent Claim
30 words
The process claimed in claim 12 , wherein determining calibration TDOA measurements comprises receiving calibration TDOA broadcasts from calibration terminals maintaining a database associating correction factors with base station pairs.
Claim 28
Dependent Claim
75 words
A mobile of a mobile communication network, comprising: means for measuring a time difference of arrival (TDOA) at the mobile for at least three base station pairs of the network; means for receiving, from another element of the network, a correction factor associated with each of said base station pairs; means for applying said correction factors to corresponding TDOA measurements to yield corrected TDOA measurements; and means for determining a location from said TDOA measurements.
Claim 29
Dependent Claim
75 words
A mobile of a mobile communication network, comprising: means for measuring a time difference of arrival (TDOA) at the mobile for at least three base station pairs of the network; means for receiving, from another element of the network, a correction factor associated with each of said base station pairs; means for applying said correction factors to corresponding TDOA measurements to yield corrected TDOA measurements; and means for determining a location from said TDOA measurements.
Claim 30
Dependent Claim
34 words
The mobile claimed in claim 21 , wherein said means for receiving correction factors comprises means for receiving correction factor broadcasts from one or more base stations associating correction factors with base station pairs.
Claim 31
Dependent Claim
31 words
The mobile claimed in claim 21 , wherein said means for receiving correction factors comprises means for querying a location server maintaining a database associating correction factors with base station pairs.
Claim 32
Dependent Claim
33 words
The mobile claimed in claim 21 , wherein said means for receiving correction factors comprises means for querying at least one calibration terminal maintaining a database associating correction factors with base station pairs.
Claim 33
Dependent Claim
34 words
The mobile claimed in claim 21 , wherein said means for receiving correction factors comprises means for receiving correction factors reported from calibration terminals maintaining a database associating correction factors with base station pairs.
Claim 34
Dependent Claim
60 words
The mobile claimed in claim 21 , wherein said means for receiving said correction factors comprises: means for receiving, from another element of the network, calibration TDOA measurements for said base station pairs made at known locations; and means for determining differences between said calibration TDOA measurements and expected TDOA measurements at said known locations for said base station pairs.
Claim 35
Dependent Claim
26 words
The mobile claimed in claim 26 , wherein said means for receiving calibration TDOA measurements comprises a database associating calibration TDOA measurements with base station pairs.
Claim 36
Dependent Claim
33 words
The mobile claimed in claim 26 , wherein said means for receiving calibration TDOA measurements comprises means for querying a location server maintaining a database associating calibration TDOA measurements with base station pairs.
Claim 37
Dependent Claim
32 words
The mobile claimed in claim 26 , wherein said means for receiving calibration TDOA measurements comprises means for querying calibration terminals maintaining a database associating calibration TDOA measurements with base station pairs.
Claim 38
Dependent Claim
36 words
The mobile claimed in claim 26 , wherein said means for receiving calibration TDOA measurements comprises means for receiving calibration TDOA measurements reported from calibration terminals maintaining a database associating correction factors with base station pairs.
Claim 39
Dependent Claim
29 words
The mobile claimed in claim 26 , wherein said means for determining expected TDOA values comprises a database associating expected TDOA measurements with base station pairs and known locations.
Claim 40
Dependent Claim
36 words
The mobile claimed in claim 26 , wherein said means for determining expected TDOA measurements comprises means for querying a location server maintaining a database associating expected TDOA measurements with base station pairs and known locations.
Claim 41
Dependent Claim
32 words
The mobile claimed in claim 26 , wherein said means for determining expected TDOA measurements comprises means for querying calibration terminals maintaining a database associating expected TDOA measurements with base station pairs.
Claim 42
Dependent Claim
35 words
The mobile claimed in claim 26 , wherein said means for determining calibration TDOA measurements comprises means for receiving calibration TDOA broadcasts from calibration terminals maintaining a database associating correction factors with base station pairs.
Claim 43
Dependent Claim
81 words
A process in an element of a mobile communication network, comprising: determining time difference of arrival (TDOA) measurements at the location of a mobile of the network for at least three base station pairs of the network; receiving, from another element of the network, correction factors corresponding to each of said at least two base station pairs; applying correction factors to corresponding TDOA measurements to yield corrected TDOA measurements; and determining a location of the mobile from said corrected TDOA measurements.
Claim 44
Dependent Claim
81 words
A process in an element of a mobile communication network, comprising: determining time difference of arrival (TDOA) measurements at the location of a mobile of the network for at least three base station pairs of the network; receiving, from another element of the network, correction factors corresponding to each of said at least two base station pairs; applying correction factors to corresponding TDOA measurements to yield corrected TDOA measurements; and determining a location of the mobile from said corrected TDOA measurements.
Claim 45
Dependent Claim
19 words
The process claimed in claim 35 , wherein determining TDOA measurements comprises receiving TDOA measurements made by a mobile.
Claim 46
Dependent Claim
32 words
The process claimed in claim 35 , wherein receiving correction factors comprises receiving correction factor broadcasts from one or more base stations maintaining a database associating correction factors with base station pairs.
Claim 47
Dependent Claim
28 words
The process claimed in claim 35 , wherein receiving correction factors comprises querying at least one calibration terminal maintaining a database associating correction factors with base station pairs.
Claim 48
Dependent Claim
52 words
The process claimed in claim 35 , wherein receiving correction factors comprises: receiving, from another element of the network, calibration TDOA measurements for said base station pairs made at known locations; and determining differences between said calibration TDOA measurements and expected TDOA measurements at said known locations for said base station pairs.
Claim 49
Dependent Claim
23 words
The process claimed in claim 39 , wherein receiving calibration TDOA measurements comprises querying a database associating correction factors with base station pairs.
Claim 50
Dependent Claim
38 words
The process claimed in claim 39 , wherein receiving calibration TDOA measurements comprises: determining an uncorrected location of said mobile using said TDOA measurements; and querying a database associating correction factors with base station pairs and geographic locations.
Claim 51
Dependent Claim
29 words
The process claimed in claim 39 , wherein receiving calibration TDOA measurements comprises querying at least one calibration terminal maintaining a database associating correction factors with base station pairs.
Claim 52
Dependent Claim
100 words
An element of a mobile communication network, comprising: means for determining time difference of arrival (TDOA) measurements at the location of a mobile of the network for at least three base station pairs of the network; means for receiving, from another element of the network, correction factors corresponding to each of said at least two base station pairs; means for applying correction factors to corresponding TDOA measurements to yield corrected TDOA measurements; means for determining a location of the mobile from said corrected TDOA measurements; and means for providing the determined location to a service provider specified by the mobile.
Claim 53
Dependent Claim
100 words
An element of a mobile communication network, comprising: means for determining time difference of arrival (TDOA) measurements at the location of a mobile of the network for at least three base station pairs of the network; means for receiving, from another element of the network, correction factors corresponding to each of said at least two base station pairs; means for applying correction factors to corresponding TDOA measurements to yield corrected TDOA measurements; means for determining a location of the mobile from said corrected TDOA measurements; and means for providing the determined location to a service provider specified by the mobile.
Claim 54
Dependent Claim
24 words
The element claimed in claim 43 , wherein said means for determining TDOA measurements comprises means for receiving TDOA measurements made by a mobile.
Claim 55
Dependent Claim
37 words
The element claimed in claim 43 , wherein said means for receiving correction factors comprises means for receiving correction factor broadcasts from one or more base stations maintaining a database associating correction factors with base station pairs.
Claim 56
Dependent Claim
30 words
The element claimed in claim 43 , wherein said means for receiving correction factors comprises means for querying calibration terminals maintaining a database associating correction factors with base station pairs.
Claim 57
Dependent Claim
59 words
The element claimed in claim 43 , wherein said means for receiving correction factors comprises: means for receiving, from another element of the network, calibration TDOA measurements for said base station pairs made at known locations; and means for determining differences between said calibration TDOA measurements and expected TDOA measurements at said known locations for said base station pairs.
Claim 58
Dependent Claim
25 words
The element claimed in claim 47 , wherein said means for receiving calibration TDOA measurements comprises a database associating correction factors with base station pairs.
Claim 59
Dependent Claim
45 words
The element claimed in claim 47 , wherein said means for receiving calibration TDOA measurements comprises: means for determining an uncorrected location of said mobile using said TDOA measurements; and means for querying a database associating correction factors with base station pairs and geographic locations.
Claim 60
Dependent Claim
34 words
The element claimed in claim 47 , wherein said means for receiving calibration TDOA measurements comprises means for querying at least one calibration terminal maintaining a database associating correction factors with base station pairs.
Claim 61
Dependent Claim
83 words
A calibration terminal of a mobile communication network, comprising: means for determining a time difference of arrival (TDOA) measurement for signals of a base station pair of the network; means for determining an expected TDOA of said signals at the location of the calibration terminal; means for determining a correction factor for the base station pair constituting a difference between the TDOA measurement and the expected TDOA measurement; and means for periodically reporting said correction factor and identification of said base station pair.
Claim 62
Dependent Claim
83 words
A calibration terminal of a mobile communication network, comprising: means for determining a time difference of arrival (TDOA) measurement for signals of a base station pair of the network; means for determining an expected TDOA of said signals at the location of the calibration terminal; means for determining a correction factor for the base station pair constituting a difference between the TDOA measurement and the expected TDOA measurement; and means for periodically reporting said correction factor and identification of said base station pair.
Claim 63
Dependent Claim
93 words
A calibration terminal of a mobile communication network, comprising: means for determining a time difference of arrival (TDOA) measurement for signals of a base station pair of the network; means for determining an expected TDOA of said signals at the location of the calibration terminal; means for determining a correction factor for the base station pair constituting a difference between the TDOA measurement and the expected TDOA measurement; means for receiving a query comprising an identification of said base station pair; and means for providing said correction factor in response to said query.
Claim 64
Dependent Claim
93 words
A calibration terminal of a mobile communication network, comprising: means for determining a time difference of arrival (TDOA) measurement for signals of a base station pair of the network; means for determining an expected TDOA of said signals at the location of the calibration terminal; means for determining a correction factor for the base station pair constituting a difference between the TDOA measurement and the expected TDOA measurement; means for receiving a query comprising an identification of said base station pair; and means for providing said correction factor in response to said query.
Claim 65
Dependent Claim
83 words
A calibration terminal of a mobile communication network, comprising: means for determining an average measured time difference of arrival (TDOA) for signals of a base station Pair of the network; means for determining an expected TDOA of said signals at the location of the calibration terminal; means for determining a fixed error correction factor constituting a difference between the average of TDOA measurements and the expected TDOA measurement; and means for periodically reporting said correction factor and identification of said base station pair.
Claim 66
Dependent Claim
83 words
A calibration terminal of a mobile communication network, comprising: means for determining an average measured time difference of arrival (TDOA) for signals of a base station Pair of the network; means for determining an expected TDOA of said signals at the location of the calibration terminal; means for determining a fixed error correction factor constituting a difference between the average of TDOA measurements and the expected TDOA measurement; and means for periodically reporting said correction factor and identification of said base station pair.
Claim 67
Dependent Claim
98 words
A calibration terminal of a mobile communication network, comprising: means for determining an average measured time difference of arrival (TDOA) for signals of a base station pair of the network; means for determining an expected TDOA of said signals at the location of the calibration terminal; means for determining a fixed error correction factor constituting a difference between the average of TDOA measurements and the expected TDOA measurement; means for receiving a query comprising an identification of said base station pair; and means for providing said fixed error and variable error correction factors in response to said query.
Claim 68
Dependent Claim
98 words
A calibration terminal of a mobile communication network, comprising: means for determining an average measured time difference of arrival (TDOA) for signals of a base station pair of the network; means for determining an expected TDOA of said signals at the location of the calibration terminal; means for determining a fixed error correction factor constituting a difference between the average of TDOA measurements and the expected TDOA measurement; means for receiving a query comprising an identification of said base station pair; and means for providing said fixed error and variable error correction factors in response to said query.
Claim 69
Dependent Claim
120 words
A process in a base station of a communication network, comprising: providing a query to a calibration terminal of said network comprising identification of said base station and a reference base station; receiving a difference of a time difference of arrival (TDOA) at a known location of a signal from said base station relative to a signal from the reference base station and an expected TDOA at said known location of a signal from said base station relative to a signal from said reference base station; and adjusting timing of said signal of said base station by an amount of said difference to align a PN offset of the base station with a PN offset of the reference base station.
Claim 70
Dependent Claim
120 words
A process in a base station of a communication network, comprising: providing a query to a calibration terminal of said network comprising identification of said base station and a reference base station; receiving a difference of a time difference of arrival (TDOA) at a known location of a signal from said base station relative to a signal from the reference base station and an expected TDOA at said known location of a signal from said base station relative to a signal from said reference base station; and adjusting timing of said signal of said base station by an amount of said difference to align a PN offset of the base station with a PN offset of the reference base station.
Claim 71
Dependent Claim
123 words
A base station of a communication network, comprising: means for providing a query to a calibration terminal of said network comprising identification of said base station and a reference base station; means for receiving a difference of a time difference of arrival (TDOA) at a known location of a signal from said base station relative to a signal from the reference base station and an expected TDOA at said known location of a signal from said base station relative to a signal from said reference base station; and means for adjusting timing of said signal of said base station by an amount of said difference to align a PN offset of the base station with a PN offset of the reference base station.
Claim 72
Dependent Claim
123 words
A base station of a communication network, comprising: means for providing a query to a calibration terminal of said network comprising identification of said base station and a reference base station; means for receiving a difference of a time difference of arrival (TDOA) at a known location of a signal from said base station relative to a signal from the reference base station and an expected TDOA at said known location of a signal from said base station relative to a signal from said reference base station; and means for adjusting timing of said signal of said base station by an amount of said difference to align a PN offset of the base station with a PN offset of the reference base station.
Claim 73
Dependent Claim
101 words
A process in a base station of a communication network, comprising: determining a difference of an average measured time difference of arrival (TDOA) at a known location of a signal from said base station relative to a signal from a reference base station and an expected TDOA at said known location of a signal from said base station relative to a signal from said reference base station; and adjusting timing of said signal of said base station by an amount of said difference to align a PN offset of the base station with a PN offset of the reference base station.
Claim 74
Dependent Claim
101 words
A process in a base station of a communication network, comprising: determining a difference of an average measured time difference of arrival (TDOA) at a known location of a signal from said base station relative to a signal from a reference base station and an expected TDOA at said known location of a signal from said base station relative to a signal from said reference base station; and adjusting timing of said signal of said base station by an amount of said difference to align a PN offset of the base station with a PN offset of the reference base station.
Claim 75
Dependent Claim
33 words
The process claimed in claim 57 , wherein determining a difference comprises: providing a query to a network element maintaining a database associating base stations pairs and average TDOAs; and receiving said average.
Claim 76
Dependent Claim
102 words
A base station of a communication network, comprising: means for determining a difference of an average measured time difference of arrival (TDOA) at a known location of a signal from said base station relative to a signal from a reference base station and an expected TDOA at said known location of a signal from said base station relative to a signal from said reference base station; and means for adjusting timing of said signal of said base station by an amount of said difference to align a PN offset of the base station with a PN offset of the reference base station.
Claim 77
Dependent Claim
102 words
A base station of a communication network, comprising: means for determining a difference of an average measured time difference of arrival (TDOA) at a known location of a signal from said base station relative to a signal from a reference base station and an expected TDOA at said known location of a signal from said base station relative to a signal from said reference base station; and means for adjusting timing of said signal of said base station by an amount of said difference to align a PN offset of the base station with a PN offset of the reference base station.
Claim 78
Dependent Claim
65 words
The base station claimed in claim 59 , wherein said means for determining a difference comprises: means for determining a network element maintaining a database associating said base station pairs and average TDOAs over a period of time; means for providing a query to a determined network element comprising identification of said base station and said reference base station; and means for receiving said average.
Claim 79
Dependent Claim
79 words
A process in a base station of a communication network, comprising: providing a query to a calibration terminal of said network comprising identification of said base station and a reference base station; receiving from the calibration terminal a correction factor for time difference of arrival (TDOA) measurements for said base station and said reference base station; storing said correction factor; and periodically broadcasting said correction factor in conjunction with identification of said base station and said reference base station.
Claim 80
Dependent Claim
79 words
A process in a base station of a communication network, comprising: providing a query to a calibration terminal of said network comprising identification of said base station and a reference base station; receiving from the calibration terminal a correction factor for time difference of arrival (TDOA) measurements for said base station and said reference base station; storing said correction factor; and periodically broadcasting said correction factor in conjunction with identification of said base station and said reference base station.
Claim 81
Dependent Claim
84 words
A base station of a communication network, comprising: means for providing a query to a calibration terminal of said network comprising identification of said base station and a reference base station; means for receiving from said calibration terminal a correction factor for time difference of arrival (TDOA) measurements for said base station and said reference base station; means for storing said correction factor; and means for periodically broadcasting said correction factor in conjunction with identification of said base station and said reference base station.
Claim 82
Dependent Claim
84 words
A base station of a communication network, comprising: means for providing a query to a calibration terminal of said network comprising identification of said base station and a reference base station; means for receiving from said calibration terminal a correction factor for time difference of arrival (TDOA) measurements for said base station and said reference base station; means for storing said correction factor; and means for periodically broadcasting said correction factor in conjunction with identification of said base station and said reference base station.
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US6070083A
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US5999116A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-05-07 | 2004-11-06 | 2005-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-05-07 | 2008-11-06 | 2009-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-05-07 | 2012-11-06 | 2013-05-08 | $7700.00 | Window Closed / Lapsed |