MECHANISM TO FACILITATE TIMING RECOVERY IN TIME DIVISION DUPLEX SYSTEMS
First Claim
1. A method to facilitate timing recovery at a receiver in a time division duplex (TDD) communication system, comprising:
- defining a maximum period of inactivity of downstream transmissions in a TDD frame;
specifying timing keep alive signals; and
transmitting the specified timing keep alive signals downstream to the receiver during the downstream transmissions.
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Accused Products
Abstract
In general, the present invention relates to systems and methods to facilitate timing recovery and loop timing operations in a TDD communication system with significantly varying intervals of inactivity between periods of transmission. According to certain aspects, to facilitate timing recovery, embodiments of the invention define a maximum period of inactivity for each mode of transmission and associated “timing keep alive” signals during and/or between transmissions to assist the timing recovery function in the receiver. In embodiments, the receiver selects the desired format of the “timing keep alive” signal. According to further aspects, the timing recovery mechanisms of the invention maintain power saving objectives of G.fast, where power dissipation varies near linearly with traffic demand.
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Citations
20 Claims
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1. A method to facilitate timing recovery at a receiver in a time division duplex (TDD) communication system, comprising:
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defining a maximum period of inactivity of downstream transmissions in a TDD frame; specifying timing keep alive signals; and transmitting the specified timing keep alive signals downstream to the receiver during the downstream transmissions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A time division duplex (TDD) communication system, comprising:
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an upstream transmitter; and a downstream receiver, wherein the downstream receiver is adapted to define a maximum period of inactivity of downstream transmissions in a TDD frame and to specify timing keep alive signals, and wherein the transmitter is adapted to transmit the specified timing keep alive signals downstream to the receiver during the downstream transmissions. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification