Method and apparatus for bandwidth-efficient multicast in ethernet passive optical networks
US7289501B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 6, 2003 |
| Grant date | Oct 30, 2007 |
| Priority date | — |
| Expiry date | Apr 26, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2011/0064
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
One embodiment of the present invention provides a system that facilitates bandwidth-efficient multicast in EPONs. The system includes a central node and at least one remote node. Downstream data from the central node is broadcast through a passive optical coupler to remote nodes. In the other direction, upstream data from a remote node is transmitted through the passive optical coupler to the central node in a unicast manner. During operation, the system first selects a common multicast LLID to represent a number of remote nodes that comprise a multicast group. Upon receiving a multicast message destined to the multicast group, the system sends the multicast message along with the multicast LLID for the multicast group, whereby the multicast message is broadcast through the passive optical coupler in the downstream direction. This allows each remote node belonging to the multicast group to receive the multicast message by matching the multicast LLID.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.