US 8,526,815 B2 · Dynamic bandwidth allocation for congestion management in PON channel aggregation

Abstract

A method and protocol for dynamic upstream bandwidth allocation to prevent congestion in an aggregation system consisting of multiple PON OLT devices that share a common Service Network Interface (SNI). The method allows OLT devices to communicate real time user traffic load information, and for each OLT to self-throttle upstream throughput based on overall system view of traffic load. The method allows the available SNI bandwidth to be dynamically allocated to OLT ports while maintaining fairness per ONT (user). The method is implemented as a peer-to-peer protocol and does not require central controller resources. The method can be implemented in existing PON systems using software. The method saves the need for expensive dedicated traffic manager devices on the OLT aggregation point.

Claims22

Dependent claims

A method of dynamic bandwidth allocation in a passive optical network (PON) communications system, the PON communications system including a plurality of optical line terminal (OLT) port controllers, wherein each OLT port controller controls at least one respective optical networking terminal (ONT), and wherein data is forwarded by the OLT port controllers towards a common service network interface (SNI), the method comprising the steps of:

(a) generating by each of the plurality of OLT port controllers a respective broadcast occupancy report (BOR);
(b) transmitting from each of the plurality of OLT port controllers the respective BORs to the plurality of OLT port controllers;
(c) receiving the respective BORs at each of the plurality of OLT port controllers;
and
(d) dynamically assigning bandwidth at each of the plurality of OLT port controllers to each of the controlled ONTs for transmission from each of the controlled ONTs toward the common SNI, the assigned bandwidth based on the respective BORs that the OLT port controllers receive, the assigned bandwidth dynamically controlling aggregated bandwidth toward the common SNI.

2 more elements

A method of dynamic bandwidth allocation in a passive optical network (PON) communications system, the PON communications system including a plurality of optical line terminal (OLT) port controllers, wherein each OLT port controller controls at least one respective optical networking terminal (ONT), wherein data is forwarded by the OLT port controllers towards a service network interface (SNI), and including a central controller, the method comprising the steps of:

(a) generating by each of the plurality of OLT port controllers a respective broadcast occupancy report (BOR);
(b) transmitting from each of the plurality of OLT port controllers the respective BORs to the central controller;
(c) receiving the respective BORs at the central controller, calculating, at the central controller a respective share of SNI bandwidth for each OLT port controller based on the received respective BORs, and transmitting said respective share of SNI bandwidth to each respective OLT port controller;
(d) receiving said respective share of SNI bandwidth at each of the plurality of OLT port controllers;
and
(e) dynamically assigning bandwidth at each of the plurality of OLT port controllers to each of the controlled ONTs for transmission from each of the controlled ONTs toward the common SNI, the assigned bandwidth based on the received respective share of SNI bandwidth, the assigned bandwidth dynamically controlling aggregated bandwidth toward the common SNI.

3 more elements

Dependencies are inferred from the claim text.

Dynamic bandwidth allocation for congestion management in PON channel aggregation

Life of this patent

Dynamic bandwidth allocation for congestion management in PON channel aggregation

Life of this patent

Abstract

Claims22