Relay system in ring topology

Patent metadata

Field	Value
Publication number	US-9559777-B2
Application number	US-201414411485-A
Country	US
Kind code	B2
Filing date	Aug 14, 2014
Priority date	Dec 4, 2013
Publication date	Jan 31, 2017
Grant date	Jan 31, 2017

Abstract

A master unit configured to manage a plurality of remote units connected in a ring topology, the master unit comprising: a network management section configured to transmit at least one of a path-state monitoring control signal and a delay measurement control signal to the plurality of remote units in a first direction and a second direction which is a reverse direction of the first direction, and receives an acknowledgement signal in response to the at least one of a path-state monitoring control signal and a delay measurement control signal; and switching control means for transmitting a forward signal received from a base station in the first direction, and transmitting a switching control signal in the second direction when a defect is detected in any remote unit among the plurality of remote units by the network management section.

First claim

What is claimed is:

1. A remote unit that is interposed between first and second remote units in a ring topology, comprising:
a first deframer configured to deframe first signals received from the first remote unit;
a first framer configured to frame a first transmitting target signal, which is required to be transmitted to the second remote unit, among the first receiving signals;
a second deframer configured to deframe second signals received from the second remote unit;
a second framer configured to frame a second transmitting target signal, which is required to be transmitted to the first remote unit, among the second receiving signals;
a forward DSP section configured to perform digital signal processing on service signals, which are required to be transmitted to a user terminal, among the first receiving signals and the second receiving signals;
a reverse DSP section configured to perform digital signal processing on a terminal signal transmitted from the user terminal; and
a control section configured to switch between a first switching state in which the first receiving signals and the second receiving signals are respectively used as a forward signal and a reverse signal, and a second switching state in which the first receiving signals and the second receiving signals are respectively used as a reverse signal and a forward signal, in response to a switching control signal.

2. The remote unit of claim 1 , wherein the control section is configured to control in the first switching state such that an output signal of the reverse DSP section is summed to a input signal of the second framer, and control in the second switching state such that the output signal of the reverse DSP section is summed to a input signal of the first framer.

3. The remote unit of claim 1 , wherein continuous switching control by the control section is performed at an interval corresponding to a predetermined waiting time.

4. The remote unit of claim 1 , wherein the control section is configured to control in the first switching state such that remote clock recovery is performed in the first deframer, and control in the second switching state such that the remote clock recovery is performed in the second deframer.

5. The remote unit of claim 1 , further comprising:
a monitoring section configured to transmit a path-state monitoring control signal or at least one control signal to one of the first and second remote units serving as an upper layer remote unit in the first switching state or the second switching state.

6. The remote unit of claim 5 , wherein the control section is configured to perform switching control when a defect is detected in one of the first and second remote units serving as an upper layer remote unit.

7. The remote unit of claim 6 , wherein the control section is configured to transmit a switching control signal to other remote units on the other path of one of the first and second remote units serving as an upper layer remote unit.

8. The remote unit of claim 7 , wherein the switching control signal is relayed in a daisy chain manner.

Assignees

• Solid Inc

Inventors

• Kim Do Yoon
• Seo Kwang Nam
• Kim Hee Gon

Classifications

• H04B10/275 Primary

  Ring-type networks · CPC title

• H04B10/29 Primary

  Repeaters · CPC title

• H04B10/038

  using bypasses · CPC title

• H04Q11/0005 Primary

  Switch and router aspects · CPC title

• H04Q2011/0045

  Synchronisation · CPC title