Node unit capable of measuring and compensating transmission delay and distributed antenna system including the same

Patent metadata

Field	Value
Publication number	US-2019380102-A1
Application number	US-201916548929-A
Country	US
Kind code	A1
Filing date	Aug 23, 2019
Priority date	Dec 30, 2014
Publication date	Dec 12, 2019
Grant date	—

Abstract

Provided is a node unit which is branch-connected to another communication node via a transport medium, the node unit comprising: a delay measurement unit which transmits a test signal for measuring a delay to an adjacent node unit of the branch-connected upper stage via the transport medium and detects a loopback signal to which the test signal is looped back via the adjacent node unit of the upper stage, thereby measuring an upper stage transmission delay between the adjacent node unit of the upper stage and the node unit; a delay summation unit which, when an adjacent node unit of the branch-connected lower stage exists, receives a lower stage transmission delay transmitted from the adjacent node unit of the lower stage, and calculates a summed transmission delay by summing the upper stage transmission delay and the lower stage transmission delay; and a control unit which transmits the summed transmission delay to the adjacent node unit of the upper stage.

First claim

1 . A node unit of a digital radio frequency (RF) transport system, the node unit comprising at least one processor and at least one memory to implement:
a delay measurer configured to measure a first delay between the node unit and a first adjacent node unit; a delay summer configured to generate a summed delay by summing the first delay and a second delay between the node unit and a second adjacent node unit, wherein the second delay is received from a second adjacent node unit; a controller configured to calculate a compensation value based on the summed delay and delay deviation information; and a delay compensator configured to perform a delay compensation operation for equalizing a delay of entire of the digital RF transport system based on the compensation value, wherein the delay deviation information corresponds to a difference between a maximum delay in the digital RF transport system and the summed delay.

2 . The node unit of claim 1 , wherein the delay deviation information is received from the first adjacent node unit or the second adjacent node unit.

3 . The node unit of claim 2 , wherein the delay deviation information is received via a control & management (C&M) channel.

4 . The node unit of claim 1 , wherein the maximum delay of the digital RF transport system is a delay having a maximum value among the summed delay in a branch including the node unit and other summed delays of other branches.

5 . The node unit of claim 1 , wherein the delay measurer is configured to transmit a test signal to the first adjacent node unit and measure the first delay based on the test signal looped back by the first adjacent node unit.

6 . The node unit of claim 1 , wherein the controller is configured to calculate the compensation value by summing the summed delay and the delay deviation information.

7 . The node unit of claim 1 , wherein the controller is configured to transmit the summed delay to the first adjacent node unit or the second adjacent node unit.

8 . The node unit of claim 1 , wherein the delay compensator is configured to perform the delay compensation operation with respect to a plurality of the digitized RF signal transmitted to the first adjacent node unit or the second adjacent node unit.

9 . The node unit of claim 8 , wherein the delay compensator is configured to selectively perform the delay compensation operation with respect to a portion of the plurality of the digitized RF signal.

10 . The node unit of claim 1 , wherein the first adjacent node unit, the node unit and the second adjacent node unit are connected in a cascade manner.

11 . The node unit of claim 1 , wherein, when a third adjacent node unit connected to the second adjacent node unit exists, the second delay includes a third delay between the third adjacent node unit and the second adjacent node unit.

Assignees

• Solid Inc

Inventors

• Kim Doyoon
• Kim Hyoungho

Classifications

• H04W56/007

  Open loop measurement · CPC title

• H04B17/14 Primary

  of the whole transmission and reception path, e.g. self-test loop-back · CPC title

• H04L7/0041

  Delay of data signal · CPC title

• H04B17/103

  Reflected power, e.g. return loss · CPC title

• H04B17/10

  of transmitters · CPC title