SYNCHRONIZATION FOR FEMTO-CELL BASE STATIONS
First Claim
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1. A method for timing synchronization in a first base station of a first communication network via a second base station of second communication network uncoordinated with the first communication network, the method comprising the step of:
- obtaining timing synchronization information from the second base station; and
adjusting a clock of the first base station in response to the synchronization information.
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Abstract
Timing synchronization between base stations of uncoordinated communication networks includes obtaining timing synchronization information from one base station, and adjusting a clock of the other station in response to the synchronization information. The timing synchronization information can be identified from a strongest synchronization signal from nearby uncoordinated base stations. The timing synchronization can accommodate clock offsets and frequency offsets.
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Citations
25 Claims
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1. A method for timing synchronization in a first base station of a first communication network via a second base station of second communication network uncoordinated with the first communication network, the method comprising the step of:
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obtaining timing synchronization information from the second base station; and adjusting a clock of the first base station in response to the synchronization information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for timing synchronization in a first base station of a first communication network via an overlaying second base station of second communication network uncoordinated with the first communication network, the method comprising the step of:
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obtaining timing synchronization information by identifying a strongest broadcast synchronization signal preamble from nearby second base stations; and adjusting a clock of the first base station in response to the synchronization information by correcting a frequency offset of the first base station and measuring the time difference as the sum of a clock error and a propagation delay from the second base station to the first base station. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A first base station of a first communication network, the first base station operable to provide itself timing synchronization via a second base station of second communication network uncoordinated with the first communication network, the first base station comprising:
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a clock operable to maintain timing of the first base station; a receiver operable to obtain timing synchronization information from the second base station; and a processor coupled to the clock and the receiver, the processor operable to adjust the clock in response to the synchronization information.
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Specification