Phase adjusting method and apparatus

• US 20060105728A1
• Filed: 02/28/2005
• Published: 05/18/2006
• Est. Priority Date: 11/17/2004
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Toyoda, Yoshimi, Fujii, Isshin, Kaise, Osamu, Sunden, Hironobu, Handa, Sadayoshi
• Granted Patent: US 7,496,330 B2
• Time in Patent Office: Days
• US Class Current: 455/260
• CPC Class Codes: G01S 13/84 for distance determination by phase measurement
• CPC Class Codes: H04J 3/0623 Synchronous multiplexing systems, e.g. synchronous digital hierarchy/synchronous optical network (SDH/SONET), synchronisation with a pointer process
• CPC Class Codes: H04J 3/0682 by delay compensation, e.g. by compensation of propagation delay or variations thereof, by ranging
• CPC Class Codes: H04J 3/14 Monitoring arrangements for SDH/SONET rings H04J3/085

Abstract

In a phase adjusting method and device in which a phase deviation between main signal frames themselves returned from a station end device through an antenna end device to the station end device without using a control signal for the phase adjustment, a reference signal generated in a first device is commonly mapped to respective down main signal frames of a first and a second system to be outputted to a second device, the second device maps, pointer values indicating timings of the reference signal in the respective down main signal frames to respective up main signal frames of the first and the second system to be outputted to the first device, and the first device extracts respective pointer values from the respective main signal frames and adjust frames of the respective up main signal frames based on the respective pointer values.

Claims

1. A phase adjusting method comprising:

a first step of commonly mapping a reference signal generated in a first device to respective down main signal frames of a first and a second system to be outputted to a second device;

a second step of mapping, at the second device, respective pointer values indicating timings of the reference signal in the respective down main signal frames to respective up main signal frames of the first and the second system to be outputted to the first device; and

a third step of extracting, at the first device, the respective pointer values from the respective up main signal frames and adjusting phases of the respective up main signal frames based on the respective pointer values.

2. A phase adjusting apparatus comprising:

a first device generating and commonly mapping a reference signal to respective down main signal frames of a first and a second system to be outputted; and

a second device mapping respective pointer values indicating timings of the reference signal in the respective down main signal frames from the first device to respective up main signal frames of the first and the second system to be outputted to the first device;

the first device extracting the respective pointer values from the respective up main signal frames from the second device and adjusting phases of the respective up main signal frames based on the respective pointer values.

3. The phase adjusting apparatus as claimed in claim 2, wherein the second device sets, as the respective pointer values, times from a point when the reference signal is extracted to data head points of the respective up main signal frames in free spaces of headers of the respective up main signal frames.

4. The phase adjusting apparatus as claimed in claim 3, wherein the first device comprises an interface portion setting, when the respective up main signal frames from the second device are changed to frames for the first device, the extracted pointer values and a predicted round-trip time from the timing of the reference signal to points when the pointer values are returned in free spaces of the frames changed, and a reception adjustor extracting the predicted round-trip time and adjusting the phases of the respective up main signal frames from the interface portion based on the pointer values with the predicted round-trip time being made a center.

5. The phase adjusting apparatus as claimed in claim 2, wherein the first and the second device respectively comprise a station end device and an antenna and device.

6. The phase adjusting apparatus as claimed in claim 2, wherein the first and the second system respectively comprises a working system and a protection system, in which the first device performs a phase adjustment between the working system-protection system.

7. The phase adjusting apparatus as claimed in claim 2, wherein the system comprises a card, in which the first device performs a phase adjustment between all of the cards.

8. The phase adjusting apparatus as claimed in claim 2, wherein the first and the second system respectively comprise a working system and a protection system, in which a plurality of cards including at least one of the working system and the protection system are provided, so that the first device performs a phase adjustment between the working system-protection system in all of the cards.