Method for switching modulation format of passive optical network, apparatus, and system

Patent metadata

Field	Value
Publication number	US-10601515-B2
Application number	US-201816054388-A
Country	US
Kind code	B2
Filing date	Aug 3, 2018
Priority date	Feb 5, 2016
Publication date	Mar 24, 2020
Grant date	Mar 24, 2020

Abstract

Embodiments of the present invention disclose a method for switching a modulation format of a passive optical network, an apparatus, and a system. The method includes: separately delivering, by an OLT, a registration message to an optical network unit in all supported upstream modulation formats and/or downstream modulation formats; receiving, by the OLT, a first message reported by the optical network unit, where the first message includes an upstream modulation format capability and/or a downstream modulation format capability; and determining, by the OLT, a target upstream modulation format and/or a target downstream modulation format of the optical network unit according to the first message, and instructing the optical network unit to switch to the target upstream modulation format and/or the target downstream modulation format. Therefore, in a PON system that supports a plurality of modulation formats, a modulation format reporting capability of the ONU is improved.

First claim

What is claimed is:

1. A method implemented at an optical line terminal for switching a modulation format of a passive optical network, comprising:
subsequent to notifying an optical network unit of all upstream modulation formats and/or downstream modulation formats supported by the optical line terminal, separately delivering a registration message indicative of a registration window to the optical network unit in all supported upstream modulation formats and/or downstream modulation formats;
receiving a first message reported by the optical network unit, wherein the first message indicates the registration window satisfies a current upstream modulation format and/or downstream modulation format of the optical network unit, and comprises an upstream modulation format capability and/or a downstream modulation format capability; and
determining a target upstream modulation format and/or a target downstream modulation format of the optical network unit according to the first message, and instructing the optical network unit to switch to the target upstream modulation format and/or the target downstream modulation format.

2. The method according to claim 1 , wherein after the instructing the optical network unit to switch to the target upstream modulation format and/or the target downstream modulation format, the method further comprises:
receiving a second message reported by the optical network unit, wherein the second message comprises an indication that the optical network unit has switched to the target upstream modulation format and/or the target downstream modulation format; and
switching to the target upstream modulation format and/or the target downstream modulation format, delivering an acknowledgement grant message in the target upstream modulation format and/or the target downstream modulation format, and performing synchronization acknowledgement with the optical network unit.

3. The method according to claim 2 , wherein after the delivering an acknowledgement grant message in the target upstream modulation format and/or the target downstream modulation format, and performing synchronization acknowledgement with the optical network unit, the method further comprises:
receiving a third message reported by the optical network unit, wherein the third message comprises receiving bit error information; and
determining, according to the third message, that the optical network unit has switched an upstream modulation format and/or a downstream modulation format.

4. The method according to claim 3 , further comprising:
delivering a fourth message to the optical network unit to instruct the optical network unit to switch back to a source upstream modulation format and/or a source downstream modulation format.

5. The method according to claim 2 , wherein after the delivering of the acknowledgement grant message in the target upstream modulation format and/or the target downstream modulation format, the method further comprises:
determining whether the optical network unit receives the acknowledgement grant message within a first preset time, and if the optical network unit does not receive the acknowledgement grant message within the first preset time, increasing a value of a counter by 1; and
determining whether the value of the counter is greater than a threshold, and if the value of the counter is greater than the threshold, ending switching of an upstream modulation format and/or a downstream modulation format.

6. A method implemented at an optical network unit for switching a modulation format of a passive optical network, comprising:
subsequent to receiving from an optical line terminal a notification of all upstream modulation formats and/or downstream modulation formats supported by the optical line terminal, receiving from the optical line terminal a registration message indicative of a registration window in an upstream modulation format and/or a downstream modulation format;
in response to a registration window satisfying a current upstream modulation format and/or downstream modulation format of the optical network unit reporting a first message to the optical line terminal, wherein the first message comprises an upstream modulation format capability and/or a downstream modulation format capability;
receiving a notification message delivered by the optical line terminal, wherein the notification message comprises a target upstream modulation format and/or a target downstream modulation format; and
switching an upstream modulation format and/or a downstream modulation format to the target upstream modulation format and/or the target downstream modulation format.

7. The method according to claim 6 , wherein after the switching of the upstream modulation format and/or the downstream modulation format to the target upstream modulation format and/or the target downstream modulation format, the method further comprises:
reporting a second message to the optical line terminal, wherein the second message comprises an indication message that the optical network unit has switched to the target upstream modulation format and/or the target downstream modulation format; and
receiving an acknowledgement grant message delivered by the optical line terminal, and performing synchronization acknowledgement with the optical line terminal.

8. The method according to claim 7 , wherein after the receiving of the acknowledgement grant message delivered by the optical line terminal, and performing synchronization acknowledgement with the optical line terminal, the method further comprises:
reporting a third message to the optical line terminal, wherein the third message comprises receiving bit error information.

9. The method according to claim 8 , further comprising:
receiving a fourth message delivered by the optical line terminal, wherein the fourth message is used to instruct the optical network unit to switch back to a source upstream modulation format and/or a source downstream modulation format; and
switching back to the source upstream modulation format and/or the source downstream modulation format.

10. An optical line terminal, comprising:
a sending unit, configured to: subsequent to notifying an optical network unit of all upstream modulation formats and/or downstream modulation formats supported by the optical line terminal, separately deliver a registration message indicative of a registration window to the optical network unit in all supported upstream modulation formats and/or downstream modulation formats; and send a notification message to the optical network unit, wherein the notification message is used to instruct the optical network unit to switch to a target upstream modulation format and/or a target downstream modulation format;
a receiving unit, configured to receive a first message reported by the optical network unit, wherein the first message indicates the registration window satisfies a current upstream modulation format and/or downstream modulation format of the optical network unit, and comprises an upstream modulation format capability and/or a downstream modulation format capability; and
a processing unit, configured to determine the target upstream modulation format and/or the target downstream modulation format of the optical network unit according to the first message.

11. The optical line terminal according to claim 10 , wherein
the receiving unit is further configured to receive a second message reported by the optical network unit, wherein the second message comprises an indication that the optical network unit has switched to the target upstream modulation format and/or the target downstream modulation format;
the processing unit is further config

Assignees

• Huawei Tech Co Ltd

Inventors

• Li Shengping
• Ye Zhicheng
• Wu Xuming

Classifications

• H04Q2011/0045

  Synchronisation · CPC title

• H04Q11/0005

  Switch and router aspects · CPC title

• H04Q2011/0079

  Operation or maintenance 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

• H04B10/516 Primary

  Details of coding or modulation · CPC title