Optical communication system, optical communication method, higher-network apparatus, and optical line terminal

Patent metadata

Field	Value
Publication number	US-9602212-B2
Application number	US-201314441423-A
Country	US
Kind code	B2
Filing date	Nov 6, 2013
Priority date	Nov 14, 2012
Publication date	Mar 21, 2017
Grant date	Mar 21, 2017

Abstract

A communication system and method comprising a higher-network apparatus and a lower-network apparatus connected through a PON system, which transfers uplink data from the lower-network apparatus to the higher-network apparatus at high speed so as to meet severe conditions required for a delay time between the higher-network apparatus and the lower-network apparatus. The method including a scheduling execution process in which a higher-network apparatus performs scheduling for uplink communication from each of the lower-network apparatus to the device itself and an uplink data transmission permission process in which the higher-network apparatus calculates a transmission time and a transmission permission amount of uplink data transmitted from an ONU to OLT based on the scheduling for uplink communication and notifies the OLT.

First claim

The invention claimed is:

1. An optical communication system comprising:
one or a plurality of optical network units;
an optical line terminal connected to the one or a plurality of optical network units through an optical fiber and an optical coupler;
one or a plurality of lower-network apparatus connected to the lower level of each of the optical network units; and
a higher-network apparatus which is connected to the higher network of the optical line terminal, performs scheduling for uplink communication from each of the lower-network apparatus to the device itself with respect to each of the lower-network apparatus, calculates a transmission time and a transmission permission amount of uplink data transmitted from each of the optical network units to the optical line terminal based on the scheduling, and notifies the optical line terminal of the transmission time and the transmission permission amount of the uplink data.

2. The optical communication system according to claim 1 , wherein the higher-network apparatus calculates the transmission time and the transmission permission amount of the uplink data transmitted from each of the optical network units to the optical line terminal based on information on a delay time between each of the optical network units and the optical line terminal obtained from the optical line terminal and notifies the optical line terminal of the transmission time and the transmission permission amount of the uplink data.

3. The optical communication system according to claim 1 or 2 , wherein the one or a plurality of the lower-network apparatus are one or a plurality of radio devices in a remote radio head system, and the higher-network apparatus is a base station device in the remote radio head system.

4. An optical communication method comprising in order:
a scheduling execution step in which a higher-network apparatus performs, with respect to one or a plurality of lower-network apparatus communicating with the device itself, scheduling for uplink communication from each of the lower-network apparatus to the device itself; and
an uplink data transmission permission step in which the higher-network apparatus calculates a transmission time and a transmission permission amount of uplink data transmitted from an optical network unit to the optical line terminal based on the scheduling and notifies the optical line terminal, which is an optical line terminal connected to the lower network of the apparatus itself and is connected to one or a plurality of the optical network units, connected to the higher network of each of the lower-network apparatus, through an optical fiber and an optical coupler, of the transmission time and the transmission permission amount of the uplink data.

5. The optical communication method according to claim 4 , wherein, in the uplink data transmission permission step, the transmission time and the transmission permission amount of the uplink data transmitted from each of the optical network units to the optical line terminal are calculated based on information on a delay time between each of the optical network units and the optical line terminal obtained from the optical line terminal, and the transmission time and the transmission permission amount of the uplink data are notified to the optical line terminal.

6. The optical communication method according to claim 4 or 5 , wherein the one or a plurality of lower-network apparatus are one or a plurality of radio devices in a remote radio head system, and the higher-network apparatus is a base station device in the remote radio head system.

7. A higher-network apparatus comprising:
a scheduling execution part which performs, with respect to one or a plurality of the lower-network apparatus communicating with the device itself, scheduling for uplink communication from each of the lower-network apparatus to the device itself; and
an uplink data transmission permission part which calculates a transmission time and a transmission permission amount of uplink data transmitted from an optical network unit to the optical line terminal based on the scheduling and notifies the optical line terminal, which is an optical line terminal connected to the lower network of the apparatus itself and is connected to one or a plurality of the optical network units, connected to the higher network of each of the lower-network apparatus, through an optical fiber and an optical coupler, of the transmission time and the transmission permission amount of the uplink data.

8. The higher-network apparatus according to claim 7 , wherein the uplink data transmission permission part calculates the transmission time and the transmission permission amount of the uplink data transmitted from each of the optical network units to the optical line terminal based on information on a delay time between each of the optical network units and the optical line terminal obtained from the optical line terminal and notifies the optical line terminal of the transmission time and the transmission permission amount of the uplink data.

9. An optical communication system comprising:
one or a plurality of lower-network apparatus;
a higher-network apparatus which communicates with the one or a plurality of lower-network apparatus and performs scheduling for uplink communication from each of the lower-network apparatus to the device itself with respect to each of the lower-network apparatus;
one or a plurality of optical network units which are connected to the higher network of each of the lower-network apparatus;
an optical line terminal which is connected to the lower level of the higher-network apparatus and, at the same time, connected to the one or a plurality of optical network units through an optical fiber and an optical coupler, receives notification of the scheduling for uplink communication from the higher-network apparatus, calculates a transmission time and a transmission permission amount of uplink data transmitted from each of the optical network units to the device itself based on the scheduling for uplink communication, and notifies each of the optical network units of the transmission time and the transmission permission amount of the uplink data.

10. The optical communication system according to claim 9 , wherein the optical line terminal does not wait for notification of a transmission request amount of the uplink data from each of the optical network units and instead notifies each of the optical network units of the transmission time and the transmission permission amount of the uplink data.

11. The optical communication system according to claim 10 , wherein the optical line terminal calculates the transmission request amount of the uplink data, considered to have been notified from each of the optical network units, based on the scheduling for uplink communication and calculates the transmission time and the transmission permission amount of the uplink data based on the transmission request amount of the uplink data.

12. The optical communication system according to any one of claims 9 to 11 , wherein the one or a plurality of lower-network apparatus are one or a plurality of radio devices in a remote radio head system, and the higher-network apparatus is a base station device in the remote radio head system.

13. An optical communication method comprising in order:
a scheduling execution step in which a higher-network apparatus performs, with respect to one or a plurality of lower-network apparatus communicating with the device itself, scheduling for uplink communication from each of the lower-network apparatus to the device itself;
a scheduling notification step in which the h

Assignees

• Nippon Telegraph & Telephone

Inventors

• Kuwano Shigeru
• Terada Jun
• Iiyama Noriko
• Sakamoto Takeshi
• Tanaka Nobuyuki
• Shigematsu Satoshi

Classifications

• H04B10/25752

  Optical arrangements for wireless networks · CPC title

• H04B10/27 Primary

  Arrangements for networking · CPC title

• H04Q2011/0064

  Arbitration, scheduling or medium access control aspects · CPC title

• H04Q11/0067

  Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring · CPC title

• H04J14/08

  Time-division multiplex systems · CPC title