CA2603277A1 - Method and system for facilitating timing of base stations in an asynchronous cdma mobile communications system - Google Patents
Method and system for facilitating timing of base stations in an asynchronous cdma mobile communications system Download PDFInfo
- Publication number
- CA2603277A1 CA2603277A1 CA002603277A CA2603277A CA2603277A1 CA 2603277 A1 CA2603277 A1 CA 2603277A1 CA 002603277 A CA002603277 A CA 002603277A CA 2603277 A CA2603277 A CA 2603277A CA 2603277 A1 CA2603277 A1 CA 2603277A1
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- CA
- Canada
- Prior art keywords
- mobile station
- base stations
- time difference
- base
- relative time
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
A method for estimating relative timing of base stations in an asynchronous mobile communications system comprises receiving at a first mobile station first and second downlink signals transmitted by first and second base stations;
transmitting an uplink signal from the first mobile station to the first and second base stations; and calculating estimated relative time difference between the time bases of the first and second base stations using receive times at the first and second base stations of said uplink signal, transmit times of the first and second downlink signals, and a time difference at the first mobile station between a receive time of the second downlink signal and the transmit time of said uplink signal to account for propagation delays between first and second mobile stations.
transmitting an uplink signal from the first mobile station to the first and second base stations; and calculating estimated relative time difference between the time bases of the first and second base stations using receive times at the first and second base stations of said uplink signal, transmit times of the first and second downlink signals, and a time difference at the first mobile station between a receive time of the second downlink signal and the transmit time of said uplink signal to account for propagation delays between first and second mobile stations.
Claims (11)
1. A method for estimating a relative timing of a plurality of base stations in an asynchronous mobile communications system, comprising the steps of:
receiving at a first mobile station a first downlink signal transmitted by a first one of said base stations and a second downlink signal transmitted by a second one of said base stations;
transmitting an uplink signal from the first mobile station to the first and second base stations; and calculating an estimated relative time difference between the time base of said first base station and the time base of said second base station using receive times at the first and second base stations of said uplink signal, transmit times of the first downlink signal and the second downlink signal, and a time difference at the first mobile station between a receive time of the second downlink signal and the transmit time of said uplink signal, wherein the receive times of the uplink signal and the transmit times of the first and second downlink signals are in the time base of the base station transmitting or receiving the respective signal, said calculation accounting for propagation delays between said first mobile station and said first and second base stations.
receiving at a first mobile station a first downlink signal transmitted by a first one of said base stations and a second downlink signal transmitted by a second one of said base stations;
transmitting an uplink signal from the first mobile station to the first and second base stations; and calculating an estimated relative time difference between the time base of said first base station and the time base of said second base station using receive times at the first and second base stations of said uplink signal, transmit times of the first downlink signal and the second downlink signal, and a time difference at the first mobile station between a receive time of the second downlink signal and the transmit time of said uplink signal, wherein the receive times of the uplink signal and the transmit times of the first and second downlink signals are in the time base of the base station transmitting or receiving the respective signal, said calculation accounting for propagation delays between said first mobile station and said first and second base stations.
2. The method of claim 1, further comprising the step of utilizing the estimated relative time difference to calculate at least one possible location of a second mobile station relative to at least one of said first and second base stations by determining a distance between the second mobile station and at least one of said first and second base stations.
3. The method of claim 2, further comprising the step of determining a location of the second mobile station by using a plurality of relative time differences between a plurality of different pairs of base stations to calculate a distance between the second mobile station and each of a plurality of said base stations.
4. The method of claim 1, further comprising the step of determining at least one possible location of a second mobile station using the receive times at said first base station and said second base station of an uplink signal transmitted by said second mobile station and using said estimated relative time difference.
5. The method of claim 1, further comprising the step of determining at least one possible location of a second mobile station using receive times at the second mobile station of downlink signals transmitted by each of said first and second stations and using said estimated relative time difference.
6. The method of claim 1, further comprising the step of transmitting the value of the estimated relative time difference to a second mobile station.
7. The method of claim 6, further comprising the steps of:
estimating a propagation delay of signals transmitted between the second mobile station and the first base station and of signals transmitted between the second mobile station and the second base station based on an approximate location of the second mobile station;
adjusting the estimated relative time difference value by factoring in the estimated propagation delays to determine a local estimated relative time difference value at the mobile station;
said second mobile station correlating said local estimated relative time difference value with a matched filter output signal; and initiating a cell search based on a result of the correlating step.
estimating a propagation delay of signals transmitted between the second mobile station and the first base station and of signals transmitted between the second mobile station and the second base station based on an approximate location of the second mobile station;
adjusting the estimated relative time difference value by factoring in the estimated propagation delays to determine a local estimated relative time difference value at the mobile station;
said second mobile station correlating said local estimated relative time difference value with a matched filter output signal; and initiating a cell search based on a result of the correlating step.
8. The method of claim 6, further comprising the steps of:
said second mobile station correlating the estimated relative time difference value with a matched filter output signal; and initiating a cell search based on a result of the correlating step.
said second mobile station correlating the estimated relative time difference value with a matched filter output signal; and initiating a cell search based on a result of the correlating step.
9. The method of claim 1, wherein said estimated relative time differences are used to synchronize said first and second base stations.
10. The method of claim 1, further comprising the step of storing the computed difference in a relative time difference table.
11. The method of claim 1, wherein said first mobile station is in a state of handover.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US7449498P | 1998-02-12 | 1998-02-12 | |
| US60/074,494 | 1998-02-12 | ||
| US09/243,095 US6526039B1 (en) | 1998-02-12 | 1999-02-02 | Method and system for facilitating timing of base stations in an asynchronous CDMA mobile communications system |
| US09/243,095 | 1999-02-02 | ||
| CA002320996A CA2320996C (en) | 1998-02-12 | 1999-02-09 | Method and system for facilitating timing of base stations in an asynchronous cdma mobile communications system |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002320996A Division CA2320996C (en) | 1998-02-12 | 1999-02-09 | Method and system for facilitating timing of base stations in an asynchronous cdma mobile communications system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2603277A1 true CA2603277A1 (en) | 1999-08-19 |
| CA2603277C CA2603277C (en) | 2011-01-25 |
Family
ID=38621174
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2600700A Expired - Lifetime CA2600700C (en) | 1998-02-12 | 1999-02-09 | Method and system for facilitating timing of base stations in an asynchronous cdma mobile communications system |
| CA2603277A Expired - Lifetime CA2603277C (en) | 1998-02-12 | 1999-02-09 | Method and system for facilitating timing of base stations in an asynchronous cdma mobile communications system |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2600700A Expired - Lifetime CA2600700C (en) | 1998-02-12 | 1999-02-09 | Method and system for facilitating timing of base stations in an asynchronous cdma mobile communications system |
Country Status (1)
| Country | Link |
|---|---|
| CA (2) | CA2600700C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105372627B (en) | 2009-01-22 | 2018-06-05 | 维亚威解决方案英国有限公司 | The difference in asynchronous network between the base station timing offsets of paired base station is determined using location estimation |
| CN103548400B (en) * | 2011-03-31 | 2017-04-05 | 爱立信(中国)通信有限公司 | Method and apparatus for estimating the difference of the timing slip in cellular network |
-
1999
- 1999-02-09 CA CA2600700A patent/CA2600700C/en not_active Expired - Lifetime
- 1999-02-09 CA CA2603277A patent/CA2603277C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2600700A1 (en) | 1999-08-19 |
| CA2603277C (en) | 2011-01-25 |
| CA2600700C (en) | 2010-05-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20190211 |