Operation of wideband code division multiple access base stations
First Claim
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1. In a WCDMA system including a radio network controller for controlling a plurality of base stations in communication with at least one mobile station, a method comprising:
- receiving a first time difference, the first time difference corresponding to the difference in time of receipt at the mobile station of a downlink signal transmitted from each of at least a first base station and a second base station;
generating a relative time difference as a function of at least the first time difference; and
broadcasting the relative time difference by at least one of the first and second base stations.
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Abstract
A wideband code division multiple access system supports asynchronous operation, with each base station having its own time reference. Substantial benefits may be realized by operating the WCDMA system in a quasi-synchronous mode, in which the base stations broadcast the relative time difference between their time references and the time references of their neighbor base stations. The WCDMA system supports techniques for measuring the relative time difference.
37 Citations
20 Claims
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1. In a WCDMA system including a radio network controller for controlling a plurality of base stations in communication with at least one mobile station, a method comprising:
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receiving a first time difference, the first time difference corresponding to the difference in time of receipt at the mobile station of a downlink signal transmitted from each of at least a first base station and a second base station;
generating a relative time difference as a function of at least the first time difference; and
broadcasting the relative time difference by at least one of the first and second base stations. - View Dependent Claims (2, 3, 4, 5)
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6. A digital signal storage medium embodying machine readable instructions executable by a digital signal processing apparatus in a WCDMA system, wherein the machine readable instructions are capable of governing a function of a hardware device, and wherein said machine readable instructions cause a hardware device to:
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receive a first time difference, the first time difference corresponding to the difference in time of receipt at a mobile station of a downlink signal transmitted from each of at least a first base station and a second base station;
generate a relative time difference as a function of at least the first time difference; and
broadcast a relative time difference by at least one of the first and second base stations. - View Dependent Claims (7, 8, 9, 10)
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11. A wideband code division multiple access system comprising:
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a first base station that uses a first time reference;
a second base station that uses a second time reference; and
a controller that computes a relative time difference as a function of the difference in time of receipt at a mobile station of a downlink signal transmitted from each of at least the first base station and the second base station. - View Dependent Claims (12, 14, 16, 17, 19, 20)
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13. A wideband code division multiple access system comprising:
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a first base station that communicates with a mobile station;
a second base station that communicates with the mobile station; and
a controller, wherein the controller measures, at the first and second base stations, a round trip delay for the downlink signal and an associated uplink signal, wherein the controller receives from the mobile station a first time difference, the first time difference corresponding to the difference in time of receipt at the mobile station of a downlink signal transmitted from each of at least a first base station and a second base station, wherein the controller computes a relative time difference as a function of the measured round trip delays and the first time difference, and wherein at least one of the first base station and the second base station broadcasts the relative time difference.
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15. A method comprising:
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receiving a relative time difference transmitted by a first base station in a wideband code division multiple access system, the relative time difference being a function of the difference between a first time reference used by the first base station and a second time reference used by a second base station;
receiving from the first base station the first time reference used by a first base station; and
calculating the frame timing of the second base station as a function of the first time reference and the relative time difference.
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18. A digital signal storage medium embodying machine readable instructions executable by a digital signal processing apparatus, wherein the machine readable instructions are capable of governing a function of a hardware device, and wherein said machine readable instructions cause a hardware device to:
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receive from a first base station in a wideband code division multiple access system a relative time difference, the relative time difference being a function of the difference between a first time reference used by the first base station and a second time reference used by a second base station;
receive from the first base station the first time reference used by a first base station; and
calculate the frame timing of the second base station as a function of the first time reference and the relative time difference.
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Specification