Apparatus and a method for transmitting and receiving in a passive optical network

Patent metadata

Field	Value
Publication number	US-12081926-B2
Application number	US-202217949553-A
Country	US
Kind code	B2
Filing date	Sep 21, 2022
Priority date	Sep 24, 2021
Publication date	Sep 3, 2024
Grant date	Sep 3, 2024

Abstract

The method includes sending a first frame of a first modulation format that is suitable for a first group of receivers before sending a second frame of a second modulation format that is suitable for a second group of receivers, wherein the first modulation format is a higher modulation format than the second modulation format, and wherein the method further includes inserting into the first frame at least one symbol of the second modulation format at at least one outer edge of the first frame.

First claim

The invention claimed is:

1. A method for use in a transmitter of a passive optical network, PON, wherein the method comprises:
sending a first frame of a first modulation format that is suitable for a first group of receivers;
sending a second frame of a second modulation format that is suitable for a second group of receivers, wherein the first modulation format is a higher modulation format than the second modulation format; and
inserting into the first frame at least one symbol of the second modulation format at at least one outer edge of the first frame.

2. The method according to claim 1 , wherein the inserting inserts the at least one symbol of the second modulation format at a rear-end of the first frame.

3. The method according to claim 1 , wherein the inserting inserts at least one symbol of the second modulation format at a front-end of the first frame and inserts at least one symbol of the second modulation format at a rear-end of the first frame.

4. The method according to claim 1 , wherein the method further comprises determining the at least one symbol of the second modulation format, that is inserted into the first frame, by overwriting at least one bit related with at least one of the symbols of the first modulation format to reduce the modulation order to the second modulation format.

5. The method according to claim 1 , wherein the first frame and the second frame have a same length or wherein lengths thereof are multiples of a same base length, wherein the method further comprises determining the at least one symbol of the second modulation format according to a pattern or a quasi random pattern.

6. The method according to claim 1 , wherein the first frame comprises one or more codewords of a first code and/or wherein the second frame comprises one or more codewords of a second code.

7. The method according claim 6 , wherein the first frame comprises two or more codewords and the codewords are interleaved.

8. A method for use in a receiver of a passive optical network, PON, wherein the method comprises:
receiving a first frame of a first modulation format that is suitable for a first group of receivers;
receiving a second frame of a second modulation format that is suitable for a second group of receivers, wherein the first modulation format is a higher modulation format than the second modulation format;
decoding the first frame, wherein the decoding comprises treating at least one bit related with at least one symbol in the first frame at at least one outer edge of the first frame as unknown.

9. An apparatus for transmitting in a passive optical network, PON, wherein the apparatus is configured to perform sending a first frame of a first modulation format that is suitable for a first group of receivers; sending a second frame of a second modulation format that is suitable for a second group of receivers, wherein the first modulation format is a higher modulation format than the second modulation format, and wherein the apparatus for transmitting is further configured to perform inserting into the first frame at least one symbol of the second modulation format at at least one outer edge of the first frame.

10. The apparatus according to claim 9 , wherein the apparatus is further configured to perform inserting the at least one symbol of the second modulation format at a rear-end of the first frame.

11. The apparatus according to claim 9 , wherein the apparatus is further configured to perform inserting at least one symbol of the second modulation format at a front-end of the first frame and inserting at least one symbol of the second modulation format at a rear-end of the first frame.

12. The apparatus according to claim 9 , wherein the apparatus is further configured to perform determining the at least one symbol of the second modulation format, that is inserted into the first frame, by overwriting at least one bit related with at least one of the symbols of the first modulation format to reduce the modulation order to the second modulation format.

13. The apparatus according to claim 12 , wherein the first frame and the second frame have a same length or wherein lengths thereof are multiples of a same base length, wherein the apparatus is further configured to perform determining the at least one symbol of the second modulation format according to a pattern or a quasi random pattern.

14. The apparatus according to claim 9 , wherein the first frame comprises one or more codewords of a first code and/or wherein the second frame comprises one or more codewords of a second code.

15. An apparatus for receiving in a passive optical network, PON, wherein the apparatus is configured to perform receiving a first frame of a first modulation format that is suitable for a first group of receivers before receiving a second frame of a second modulation format that is suitable for a second group of receivers, wherein the first modulation format is a higher modulation format than the second modulation format, and wherein the apparatus for receiving is further configured to perform decoding the first frame, wherein the decoding comprises treating at least one bit related with at least one symbol in the first frame at at least one outer edge of the first frame as unknown.

Assignees

• Nokia Solutions & Networks Oy

Inventors

• Lefevre Yannick
• Lanneer Wouter
• Coomans Werner

Classifications

• H04J14/0282

  WDM tree architectures · CPC title

• H04B10/27

  Arrangements for networking · CPC title

• H04B10/697

  Arrangements for reducing noise and distortion · CPC title

• H04B10/524

  Pulse modulation · CPC title

• H04B10/5161

  Combination of different modulation schemes · CPC title