Node unit capable of measuring delay and distributed antenna system including the same
First Claim
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1. A node unit of distributed antenna system, the node unit comprising:
- a delay measuring part configured to transmit a first test signal to an upper adjacent node unit and detect the first test signal looped back via the upper adjacent node unit and measure a first round trip delay with respect to the upper adjacent node unit based on the first test signal; and
a delay providing part disposed on a signal transmission path through which a second test signal, transmitted from a lower adjacent node unit, is to be looped back to the lower adjacent node unit, and configured to provide a delay corresponding to the first round trip delay to the second test signal,wherein the second test signal is used for measuring a second round trip delay between the lower adjacent node unit and the node unit by the lower adjacent node unit.
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Abstract
A node unit of distributed antenna system, the node unit comprises a delay measuring part configured to transmit a first test signal for delay measurement to an upper adjacent node unit and detect the first test signal looped back via the upper adjacent node unit and measure a round trip delay between the node unit and the upper adjacent node unit, and a delay providing part disposed on a signal transmission path through which a second test signal for delay measurement, to be transmitted from a lower adjacent node unit, is to be looped back to the lower adjacent node unit, and configured to provide a delay corresponding to the round trip delay.
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Citations
15 Claims
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1. A node unit of distributed antenna system, the node unit comprising:
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a delay measuring part configured to transmit a first test signal to an upper adjacent node unit and detect the first test signal looped back via the upper adjacent node unit and measure a first round trip delay with respect to the upper adjacent node unit based on the first test signal; and a delay providing part disposed on a signal transmission path through which a second test signal, transmitted from a lower adjacent node unit, is to be looped back to the lower adjacent node unit, and configured to provide a delay corresponding to the first round trip delay to the second test signal, wherein the second test signal is used for measuring a second round trip delay between the lower adjacent node unit and the node unit by the lower adjacent node unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A distributed antenna system comprising:
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a main unit; and a plurality of node units connected to the main unit, wherein each of the plurality of node units includes; a delay measuring part configured to transmit a first test signal to an upper adjacent node unit and detect the first test signal looped back via the upper adjacent node unit and measure a first round trip delay with respect to the upper adjacent node unit based on the first test signal; and a delay providing part disposed on a signal transmission path through which a second test signal, transmitted from a lower adjacent node unit, is to be looped back to the lower adjacent node unit, and configured to provide a delay corresponding to the first round trip delay to the second test signal, wherein the second test signal is used for measuring a second round trip delay between the lower adjacent node unit and the node unit by the lower adjacent node unit. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification