Optical line termination, communication system, and communication control method

Patent metadata

Field	Value
Publication number	US-9847837-B2
Application number	US-201615368004-A
Country	US
Kind code	B2
Filing date	Dec 2, 2016
Priority date	Dec 25, 2015
Publication date	Dec 19, 2017
Grant date	Dec 19, 2017

Abstract

An optical line termination includes a detection circuit configured to detect a sleep request from a control apparatus to base stations; a determination circuit configured to determine, when the detection circuit detects the sleep request, whether processing of turning the base stations of requestees by the sleep request into a sleep state in accordance with the sleep request is approvable or not, based on a shortage bandwidth within a passive optical network in a different one of the base stations having a predetermined relationship with the requested base station; and a control circuit configured to discard the sleep request when the determination circuit determines that the processing is not approvable, or transfer the sleep request to the base station of the different requestee when the determination circuit determines that the processing is approval.

First claim

What is claimed is:

1. An optical line termination that is coupled to a plurality of optical network units coupled to base stations via a passive optical network (PON), and is coupled to a control apparatus that communicates with the base stations via the PON, the optical line termination comprising:
a detection circuit configured to detect a sleep request from the control apparatus to base stations;
a determination circuit configured to determine, when the detection circuit detects the sleep request, whether processing of turning the base stations of requestees by the sleep request into a sleep state in accordance with the sleep request is approvable or not, based on a shortage bandwidth within the PON in a different one of the base stations having a predetermined relationship with the requested base station; and
a control circuit configured to discard the sleep request when the determination circuit determines that the processing is not approvable, or transfer the sleep request to the base station of the different requestee when the determination circuit determines that the processing is approval.

2. The optical line termination according to claim 1 , wherein when the determination circuit determines that the processing is approvable, the control circuit turns into a sleep state one of the plurality of optical network units coupled to the base station of the requestee.

3. The optical line termination according to claim 1 , further comprising an allocation circuit configured to allocate a bandwidth within the PON to each of the plurality of optical network units, in response to a request of the bandwidth from the optical network unit, wherein
the determination circuit is configured to determine that the processing is not approvable, when a bandwidth requested by a different one of the plurality of optical network units coupled to the different base station having the predetermined relationship with the base station of the requestee by the sleep request is equal to or more than a bandwidth allocated to the different optical network unit by the allocation circuit.

4. The optical line termination according to claim 3 , wherein,
the plurality of optical network units include a first set of optical network units coupled to the base stations, and a second set of optical network units coupled to apparatuses other than the base stations,
the optical line termination further comprises a clocking circuit configured to clock a time, and
the allocation circuit allocates, depending on the time, a bandwidth with preferentially to one of the first and second sets of the optical network units over the other set.

5. The optical line termination according to any one of claim 1 , further comprising a holding circuit configured to hold position information indicating a position of each of the base stations, wherein
when the detection circuit is configured to detect the sleep request, the determination circuit is configured to search the base stations based on the position information, for a different base station positioned within a predetermined distance from the base station of the requestee by the sleep request, and determine whether the processing is approvable or not, based on a shortage bandwidth within the PON in the searched-out different base station.

6. The optical line termination according to claim 1 , further comprising a holding circuit configured to hold group information that indicates a group to which each of the base stations belongs, wherein
when the detection circuit detects the sleep request, the determination circuit searches the base stations based on the group information, for a different base station belonging to the same group as the base station of the requestee by the sleep request, and determines whether the processing is approvable or not, based on a shortage bandwidth within the PON in the searched-out different base station.

7. A communication system comprising
an optical line termination and a plurality of optical network units, the optical line termination being coupled to the plurality of optical network units via a PON, wherein
the plurality of optical network units includes a first set of optical network units each coupled to a base station,
the optical line termination is coupled to a control apparatus that communicates with the base stations via the PON, and
the optical line termination includes:
a detection circuit configured to detect a sleep request from the control apparatus to the base stations;
a determination circuit configured to determine, when the detection circuit detects the sleep request, whether processing of turning the base station of a requestee by the sleep request into a sleep state in accordance with the sleep request is approvable or not, based on a shortage bandwidth within the PON in a different one of the base stations having a predetermined relationship with the base station of a requestee by the sleep request, a propriety of processing in which the base station of the requestee is turned into a sleep state in accordance with the sleep request; and
a control circuit configured to discard the sleep request when the determination circuit determines that the processing is not approvable, or to transfer the sleep request to the base station of the requestee when the determination circuit determines that the processing is approvable, and turn into a sleep mode one of the plurality of optical network units coupled to the base station of the requestee.

8. The communication system according to claim 7 , wherein when the determination circuit determines that the processing is approvable, the control circuit makes turns into the sleep state one of the plurality of optical network units coupled to the base station of the requestee.

9. The communication system according to claim 7 , wherein
the optical line termination further includes an allocation circuit configured to allocate a bandwidth within the PON to each of the plurality of optical network units, in response to a request of the bandwidth from the optical network unit, and
the determination circuit determines that the processing is not approvable, when a bandwidth requested by a different one of the plurality of optical network units coupled to the different base station having the predetermined relationship with the base station of the requestee by the sleep request is equal to or more than a bandwidth allocated to the different optical network unit by the allocation circuit.

10. The communication system according to claim 9 , wherein,
the plurality of optical network units includes a first set of the optical network units coupled to the base stations, and a second set of the optical network units coupled to apparatuses other than the base stations,
the optical line termination further includes a clocking circuit configured to clock a time, and
the allocation circuit allocates, depending on the time, a bandwidth with preferentially to one of the first and second sets of the optical network units over the other set.

11. The communication system according to claim 7 , wherein
the optical line termination further includes a holding circuit configured to hold position information indicating a position of each of the base stations, and
when the detection circuit detects the sleep request, the determination circuit searches the base stations based on the position information, for a different base station positioned within a predetermined distance from the base station of the requestee by the sleep request, and determine whether the processing is approvable or not, based on a shortage bandwidth within the PON in the searched-out different base station.

12. The communicat

Assignees

• Fujitsu Ltd

Inventors

• Sone Kyosuke
• Aoki Yasuhiko

Classifications

• H04W88/08

  Access point devices · CPC title

• H04W52/0235

  where the received signal is a power saving command · CPC title

• H04B10/80

  Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water · CPC title

• H04B10/27 Primary

  Arrangements for networking · CPC title

• Y02D30/70

  in wireless communication networks · CPC title