Switching sub-system for distributed antenna systems using time division duplexing
First Claim
1. A method comprising:
- identifying, by a processor, a ratio between downlink sub-frames and uplink sub-frames for signals communicated via a distributed antenna system;
determining, by the processor, an initial clock setting that corresponds to the identified ratio and that controls a timing for generating switching signals that instruct at least one switch in an uplink path or the downlink path of the distributed antenna system to switch the distributed antenna system between an uplink mode and a downlink mode per the initial clock setting;
measuring a signal power in a downlink path of the distributed antenna system;
determining a switching time adjustment based on frame boundaries that correspond to the measured signal power; and
updating the initial clock setting based on the switching time adjustment.
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Abstract
A switching control module can optimize time division duplexing operations of a distributed antenna system (“DAS”). The switching control module can include a measurement receiver and a processor. The measurement receiver can measure signal powers of downlink signals in a downlink path of the DAS. The processor can determine start times for downlink sub-frames transmitted via the downlink path based on downlink signal powers measured by the measurement receiver exceeding a threshold signal power. The processor can identify a clock setting that controls a timing of switching signals used for switching the DAS between an uplink mode and a downlink mode. The processor can statistically determine a switching time adjustment for the clock setting based on switching time differentials between the clock setting and the start times. The processor can update the clock setting based on the switching time adjustment.
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Citations
20 Claims
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1. A method comprising:
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identifying, by a processor, a ratio between downlink sub-frames and uplink sub-frames for signals communicated via a distributed antenna system; determining, by the processor, an initial clock setting that corresponds to the identified ratio and that controls a timing for generating switching signals that instruct at least one switch in an uplink path or the downlink path of the distributed antenna system to switch the distributed antenna system between an uplink mode and a downlink mode per the initial clock setting; measuring a signal power in a downlink path of the distributed antenna system; determining a switching time adjustment based on frame boundaries that correspond to the measured signal power; and updating the initial clock setting based on the switching time adjustment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A switching control module comprising:
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a measurement receiver configured for measuring a signal power in a downlink path of a distributed antenna system; and a processor communicatively coupled to the measurement receiver, wherein the processor is configured for optimizing time division duplexing operations of the distributed antenna system by performing operations comprising; identifying a ratio between downlink sub-frames and uplink sub-frames for signals communicated via the distributed antenna system, determining an initial clock setting that corresponds to the identified ratio and that controls a timing for generating switching signals that instruct at least one switch in an uplink path or the downlink path of the distributed antenna system to switch the distributed antenna system between an uplink mode and a downlink mode per the initial clock setting, receiving measurements of the signal power in the downlink path from the measurement receiver, determining a switching time adjustment based on frame boundaries that correspond to the measurements of the signal power, and updating the initial clock setting based on the switching time adjustment. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A time division duplex switching sub-system disposed in a remote antenna unit of a distributed antenna system, the time division duplex switching sub-system comprising:
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at least one switch positioned in at least one of a downlink path from a master unit to an antenna of the remote antenna unit or an uplink path from the antenna to the master unit, the at least one switch configured for selectively connecting the antenna to the uplink path or the downlink path; and a processor communicatively configured for optimizing time division duplexing operations of the distributed antenna system by performing operations comprising; identifying a ratio between downlink sub-frames and uplink sub-frames for signals communicated via the distributed antenna system, determining an initial clock setting that corresponds to the identified ratio and that controls a timing for generating switching signals that instruct the at least one switch to switch the distributed antenna system between an uplink mode and a downlink mode per the initial clock setting, receiving measurements of a signal power in a downlink path of the distributed antenna system, determining a switching time adjustment based on frame boundaries that correspond to the measurements of the signal power, and updating the initial clock setting based on the switching time adjustment. - View Dependent Claims (18, 19, 20)
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Specification