Upstream data equalization method, apparatus, and system cross-reference to related applications

Patent metadata

Field	Value
Publication number	US-10506313-B2
Application number	US-201816218665-A
Country	US
Kind code	B2
Filing date	Dec 13, 2018
Priority date	Jun 14, 2016
Publication date	Dec 10, 2019
Grant date	Dec 10, 2019

Abstract

Embodiments relate to the field of PON technologies, and provide a method, apparatus, and system. The method includes: receiving capability information that is sent by an ONU by using a first preamble; calculating a tap coefficient based on the received first preamble if the capability information indicates that the ONU has an equalization capability; sending the tap coefficient to the ONU, where the ONU updates a tap coefficient of a first equalizer in the ONU based on the received tap coefficient, and when subsequently sending upstream data, sends, by using a second preamble, the upstream data equalized by using the first equalizer, and a length of the second preamble is less than a length of the first preamble; receiving the upstream data; and equalizing the received upstream data based on the second preamble by using a second equalizer in an OLT. In this way, upstream overheads can be reduced.

First claim

What is claimed is:

1. An upstream data equalization method applied to an optical line terminal (OLT), the method comprising:
receiving capability information that is sent by an optical network unit (ONU) by using a first preamble, the capability information for indicating whether the ONU has an equalization capability;
calculating a tap coefficient based on the received first preamble when the capability information indicates that the ONU has the equalization capability;
sending the tap coefficient to the ONU;
receiving upstream data that is sent by the ONU by using a second preamble; and
equalizing the received upstream data based on the second preamble by using a second equalizer in the OLT.

2. The method according to claim 1 , wherein:
in a process in which the ONU performs registration, the steps of receiving capability information that is sent by an optical network unit ONU by using a first preamble, calculating a tap coefficient based on the received first preamble if the capability information indicates that the ONU has the equalization capability, and sending the tap coefficient to the ONU are performed.

3. The method according to claim 1 , wherein:
the OLT is applied to an Ethernet passive optical network (EPON) system;
receiving capability information that is sent by an ONU by using a first preamble comprises:
receiving a registration request message (REGISTER_REQ) that is sent by the ONU by using a default first preamble, wherein REGISTER_REQ carries the capability information; and

sending the tap coefficient to the ONU comprises:
sending a first authorization acknowledgment message (REGISTER1) to the ONU, wherein REGISTER1 carries the tap coefficient, or
sending a second authorization acknowledgment message (GATE2) to the ONU, wherein GATE2 carries the tap coefficient.

4. The method according to claim 1 , wherein:
the OLT is applied to a gigabit-capable passive optical network (GPON) system or an XG-PON system;
the method further comprises:
sending a first downstream message to the ONU, wherein the first downstream message carries a length and a pattern of the first preamble and a length and a pattern of the second preamble; and
when the OLT is applied to the GPON system, the first downstream message is an upstream management message (Upstream_Overhead), or when the OLT is applied to the XG-PON system, the first downstream message is a parameter set message (Profile);

receiving capability information that is sent by an ONU by using a first preamble comprises:
receiving a first upstream message that is sent by the ONU based on the first downstream message by using the first preamble, wherein the first upstream message carries the capability information, the first upstream message is a message after the first downstream message when the ONU performs registration, and the first upstream message is an ONU serial number message (Serial_Number_ONU); and

sending the tap coefficient to the ONU comprises:
sending a second downstream message to the ONU, wherein the second downstream message carries the tap coefficient, the second downstream message is a message after the first upstream message when the ONU performs registration, and the second downstream message is an ONU identifier assignment message (Assign_ONU-ID), a ranging authorization message (Request_Registration), or a delay equalization message (Ranging_Time).

5. The method according to claim 1 , wherein:
the OLT is applied to a gigabit-capable passive optical network (GPON) system or an XG-PON system;
the method further comprises:
sending a first downstream message to the ONU, wherein the first downstream message carries a length and a pattern of the first preamble; and
when the OLT is applied to the GPON system, the first downstream message is an upstream management message (Upstream_Overhead), or when the OLT is applied to the XG-PON system, the first downstream message is a parameter set message (Profile);

receiving capability information that is sent by an ONU by using a first preamble comprises:
receiving a first upstream message that is sent by the ONU based on the first downstream message by using the first preamble, wherein the first upstream message carries the capability information, the first upstream message is a message after the first downstream message when the ONU performs registration, and the first upstream message is an ONU serial number message (Serial_Number_ONU); and

sending the tap coefficient to the ONU comprises:
sending a second downstream message to the ONU, wherein the second downstream message carries the tap coefficient and a length and a pattern of the second preamble, the second downstream message is a message after the first upstream message when the ONU performs registration, and the second downstream message is an ONU identifier assignment message (Assign_ONU-ID), a ranging authorization message (Request_Registration), or a delay equalization message (Ranging_Time).

6. The method according to claim 1 , further comprising:
sending a coefficient update notification message to the ONU having the equalization capability;
receiving an update acknowledgment message that is sent by the ONU by using the first preamble;
re-calculating the tap coefficient based on the first preamble carried in the update acknowledgment message;
feeding back the calculated tap coefficient to the ONU.

7. An upstream data equalization method applied to an optical network unit (ONU), the method comprising:
sending capability information of the ONU to an optical line terminal (OLT) by using a first preamble, the capability information for indicating whether the ONU has an equalization capability;
receiving a tap coefficient fed back by the OLT;
updating a tap coefficient of a first equalizer in the ONU based on the tap coefficient;
equalizing upstream data by using the first equalizer; and
sending the equalized upstream data to the OLT by using a second preamble.

8. The method according to claim 7 , wherein
in a process in which the ONU performs registration, the steps of sending capability information of the ONU to an optical line terminal OLT by using a first preamble, and receiving the tap coefficient fed back by the OLT are performed.

9. The method according to claim 7 , wherein:
the ONU is applied to an Ethernet passive optical network (EPON) system;
sending capability information of the ONU to an OLT by using a first preamble comprises:
sending a registration request message (REGISTER_REQ) to the OLT by using a default first preamble, wherein REGISTER_REQ carries the capability information; and

receiving the tap coefficient fed back by the OLT comprises:
receiving a first authorization acknowledgment message (REGISTER1) sent by the OLT, wherein REGISTER1 carries the tap coefficient, or
receiving a second authorization acknowledgment message (GATE2) sent by the OLT, wherein GATE2 carries the tap coefficient.

10. The method according to claim 7 , wherein:
the ONU is applied to a gigabit-capable passive optical network (GPON) system or an XG-PON system;
the method further comprises:
receiving a first downstream message sent by the OLT, wherein the first downstream message carries a length and a pattern of the first preamble and a length and a pattern of the second preamble, and
when the ONU is applied to the GPON system, the first downstream message is an upstream management message (Upstream_Overhead), or when the ONU is applied to the XG-PON system, the first downstream message is a parameter set message (Profile);

sending capability information of the ONU to an OLT by using a first preamble comprises:
sending a first upstream message to the OLT based on the firs

Assignees

• Huawei Tech Co Ltd

Inventors

• Zheng Jianyu
• Li Shengping
• Wu Xuming

Classifications

• H04B10/2525

  using dispersion-compensating fibres · CPC title

• H04Q11/0066

  Provisions for optical burst or packet networks · CPC title

• H04Q2011/0064

  Arbitration, scheduling or medium access control aspects · CPC title

• H04Q11/0067 Primary

  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

• H04Q2011/0079

  Operation or maintenance aspects · CPC title