Network delay identification method and apparatus
First Claim
1. A system for identifying transmission delay in a communication network comprising:
- a data source adapted to generate a sequence of bits;
a demodulator adapted to synchronize with the sequence of bits by shifting samples of the sequence of bits until an optimum synchronization value is generated; and
a synchronizer adapted to identify a network delay value according to the synchronized sequence of bits.
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Abstract
Network delay is determined in order to synchronize a clock in a mobile station with a reference clock. Tones are generated that represent a sequence of bits in a synchronization flag. The tones are sampled beginning at a selected sample start time. The sampled tones are demodulated to identify the bit values in the synchronization flag. The demodulator is synchronized with the sampled tones in the synchronization flag by shifting the sample start time until the samples generate an optimum synchronization value. A reference time is then identified according to the optimum sample start time.
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Citations
23 Claims
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1. A system for identifying transmission delay in a communication network comprising:
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a data source adapted to generate a sequence of bits;
a demodulator adapted to synchronize with the sequence of bits by shifting samples of the sequence of bits until an optimum synchronization value is generated; and
a synchronizer adapted to identify a network delay value according to the synchronized sequence of bits. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for identifying network delay, comprising:
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receiving tones that represent a sequence of bits, one of the bits identified as a reference bit;
sampling the tones beginning at a selected sample start time;
demodulating the tone samples to identify the bit values in the synchronization flag;
synchronizing with the tone samples by shifting the sample start time until the tone samples generate an optimum synchronization value; and
deriving a reference time according to the reference bit at the optimum synchronization value. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A computer readable medium containing code for identifying network delay, comprising:
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code adapted to receive tones that represent a sequence of bits;
code adapted to sample the tones beginning at a selected sample start time;
code adapted to demodulate the sampled tones back into bit values representing the sequence of bits;
code adapted to synchronize with the sequence of bits by shifting the sample start time until the sampled tones generate an optimum synchronization value; and
code adapted to derive a reference time according to the sample start time at the optimum synchronization value. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification