Switching sub-system for distributed antenna systems using time division duplexing
First Claim
1. A switching control module comprising:
- 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;
determining an initial clock setting 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, wherein the processor is configured for determining the initial clock setting by performing operations comprising;
obtaining multiple downlink sub-frame samples, wherein each downlink frame sample corresponds to a respective power measurement by the measurement receiver;
determining a ratio between downlink sub-frames and uplink sub-frames for signals-communicated via the distributed antenna system, anddetermining the initial clock setting based on the ratio;
determining multiple start times or end times for respective downlink sub-frames transmitted via the downlink path, wherein the processor is configured for determining each start time or end time based on the signal power measured by the measurement receiver exceeding a threshold signal power; and
updating the initial clock setting based on a switching time adjustment statistically determined from multiple switching time differentials, wherein each of the switching time differentials comprises a respective difference between the initial clock setting and a respective start time or end time.
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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
18 Claims
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1. 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; determining an initial clock setting 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, wherein the processor is configured for determining the initial clock setting by performing operations comprising; obtaining multiple downlink sub-frame samples, wherein each downlink frame sample corresponds to a respective power measurement by the measurement receiver; determining a ratio between downlink sub-frames and uplink sub-frames for signals-communicated via the distributed antenna system, and determining the initial clock setting based on the ratio; determining multiple start times or end times for respective downlink sub-frames transmitted via the downlink path, wherein the processor is configured for determining each start time or end time based on the signal power measured by the measurement receiver exceeding a threshold signal power; and updating the initial clock setting based on a switching time adjustment statistically determined from multiple switching time differentials, wherein each of the switching time differentials comprises a respective difference between the initial clock setting and a respective start time or end time. - View Dependent Claims (2, 3, 4, 5, 6)
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7. 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; a measurement receiver communicatively coupled to the downlink path and configured for measuring a signal power in the downlink path; and a processor communicatively coupled to the measurement receiver and to the at least one switch, wherein the processor is configured for optimizing time division duplexing operations of the distributed antenna system by; determining a clock setting 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, wherein the processor is configured for determining the clock setting by performing operations comprising; identifying a time division duplexing configuration utilizing a ratio between downlink sub-frames and uplink sub-frames for signals communicated via the distributed antenna system, and selecting the clock setting based on the identified time division duplexing configuration; determining multiple start times or end times for respective downlink sub-frames transmitted via the downlink path, wherein the processor is configured for determining each start time or end time based on the signal power measured by the measurement receiver exceeding a threshold signal power, and updating the clock setting based on a switching time adjustment statistically determined from multiple switching time differentials, wherein each of the switching time differentials comprises a respective difference between the clock setting and a respective start time or end time. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method comprising:
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determining an initial clock setting that controls a timing for providing switching signals to at least one switch positioned in an uplink path or a downlink path of a distributed antenna system that the at least one switch to switch the distributed antenna system between an uplink mode and a downlink mode, wherein determining the initial clock setting comprises obtaining multiple downlink sub-frame samples, wherein each downlink frame sample corresponds to a respective signal power measurement for the downlink path; determining a ratio between downlink sub-frames and uplink sub-frames for signals communicated via the distributed antenna system; and determining the initial clock setting based op the ratio; determining multiple start times or end times for respective downlink sub-frames transmitted via the downlink path, wherein each start time or end time is determined based on a measured signal power in the downlink path exceeding a threshold signal power; and updating the initial clock setting based on a switching time adjustment statistically determined from multiple switching time differentials, wherein each of the switching time differentials comprises a respective difference between the initial clock setting and a respective one of the start times or end times. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification