Optical network unit activation and low latency transmissions in delay sensitive networks

Patent metadata

Field	Value
Publication number	US-12155459-B2
Application number	US-202217649334-A
Country	US
Kind code	B2
Filing date	Jan 28, 2022
Priority date	Feb 1, 2021
Publication date	Nov 26, 2024
Grant date	Nov 26, 2024

Abstract

According to an aspect of an embodiment, a method may include assigning an activation window by an optical line terminal during a portion of an upstream transmitting window in a passive optical network (PON). The method may include performing a first modification to a first upstream transmission. The method may include performing a second modification to a second upstream transmission. The method may include receiving the first upstream transmission from a first optical network unit (ONU) during the activation window, the first ONU synchronized in the PON. The method may include receiving a second upstream transmission from a second ONU during the activation window, the second ONU requesting activation in the PON.

First claim

What is claimed is:

1. A method, comprising:
assigning an activation window by an optical line terminal (OLT) during a portion of an upstream transmitting window in a passive optical network (PON);
assigning an open contention grant such that one or more optical network units (ONUs) may transmit without an explicit grant from the OLT;
performing a first modification to a first upstream transmission;
performing a second modification to a second upstream transmission;
receiving the first upstream transmission from a first ONU during the activation window, the first ONU synchronized in the PON;
receiving the second upstream transmission from a second ONU during the activation window, the second ONU requesting activation in the PON;
receiving a third upstream transmission from a third ONU that collides with the second upstream transmission from the second ONU;
activating the second ONU in the PON; and
activating the third ONU in the PON.

2. The method of claim 1 , wherein the first modification comprises a first spreading code and the second modification comprises a second spreading code.

3. The method of claim 2 , wherein the first spreading code includes a first length, and the second spreading code includes a second length that is different from the first length.

4. The method of claim 2 , wherein the first spreading code includes at least one of an orthogonal sequence or a pseudorandom sequence and the second spreading code includes at least one of the orthogonal sequence or the pseudorandom sequence.

5. The method of claim 2 , wherein the first spreading code is an orthogonal sequence, and the second spreading code is a pseudorandom sequence.

6. The method of claim 2 , wherein the first modification further comprises a first transmit power modulation, and the second modification further comprises a second transmit power modulation.

7. The method of claim 1 , further comprising the OLT receiving the first upstream transmission and the second upstream transmission by a soft decision receiver.

8. The method of claim 1 , further comprising the OLT receiving the first upstream transmission and the second upstream transmission by a hard decision receiver.

9. The method of claim 1 , wherein the first upstream transmission comprises a low latency, high priority transmission.

10. The method of claim 1 , wherein a first data of the first upstream transmission is forward error correction (FEC) coded using a first code setting, and a second data of the second upstream transmission is FEC coded using a second code setting.

11. The method of claim 1 , further comprising restricting the third upstream transmission from the third ONU during the activation window, the third upstream transmission including a non-low latency transmission.

12. The method of claim 1 , wherein the second ONU randomly selects the first spreading code and the third ONU randomly selects the second spreading code.

Assignees

• Maxlinear Inc

Inventors

• STROBEL Rainer

Classifications

• H04L7/0058

  detection of error based on equalizer tap values · CPC title

• H04L7/0075

  with photonic or optical means · CPC title

• H04L7/033

  using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop · CPC title

• H04Q2011/0079

  Operation or maintenance aspects · CPC title

• H04J14/0227

  Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation · CPC title