Centralized congestion avoidance in a passive optical network
AssigneeNokia Siemens Networks Oy
InventorAllen Wang
Life of this patent
Estimating the term…
Abstract
In one aspect, a method for congestion avoidance in a passive optical network having an optical line terminal communicatively connected to a plurality of optical network termination devices is provided. A dynamic bandwidth allocation information is periodically requested from the optical network termination device and the optical line terminator receives the response to the request. An adjusted bandwidth allocation for the optical network termination device is determined by the optical line terminator. The optical line terminator determines a packet-drop command to be taken at the optical network termination device. The adjusted bandwidth allocation and the packet-drop command are sent to the optical network termination device.
Claims18
A method for congestion avoidance in a passive optical network having an optical line terminator communicatively connected to a plurality of optical network termination devices, comprising:
- periodically requesting a dynamic bandwidth allocation information from an optical network termination device by the optical line terminator;
- receiving the dynamic bandwidth allocation information having a queue fill level from the optical network termination device in response to the request;
- determining an adjusted bandwidth allocation for the optical network termination device by the optical line terminator;
- determining by the optical line terminator a packet-drop command to be taken at the optical network termination device;
- and
- sending to the optical network termination device the adjusted bandwidth allocation and the packet-drop command,
- whereby a dynamic congestion avoidance is provided centrally at the optical line terminator for the plurality of devices.
A method for congestion avoidance in an optical network termination device of a passive optical network, comprising:
- sending upon request, a dynamic bandwidth allocation information to an optical line terminator;
- receiving an adjusted bandwidth allocation and a packet-drop command from the optical line terminator;
- and
- executing the packet-drop command,
- whereby a dynamic congestion avoidance is provided remotely for the optical line terminator.
An optical line terminator providing a dynamic congestion avoidance in a passive optical network, comprising:
- a communication connection to a plurality of optical network termination devices each having a priority queue;
- a plurality of network avoidance parameters;
- a dynamic bandwidth mechanism that allocates bandwidth for the optical network termination devices and that dynamically updates the network avoidance parameters;
- and
- a feedback mechanism that analyzes upstream traffic from the optical network termination device and periodically provides information based on the analysis to the dynamic bandwidth mechanism to aid in the update of the parameters,
- whereby a dynamic congestion avoidance is provided centrally at the optical line terminator for the plurality of devices.
Dependencies are inferred from the claim text.