Patent ID: 7483435
Filing Date: 2009-01-27
Classification: H04J,H04L

Abstract:
1. A process for transmitting data by a multi-user, point to multi-point digital data transmission system, where various user modems are in two-way communication over a power line, a downstream channel being the channel used in the communication between a user modem and numerous addressee user modems, and an upstream channel being that used in the communication to this specific user modem; wherein the process comprises: carrying out the transmission of information at various speeds to various addressee user modems over said power line; carrying out time division in the down-stream channel adaptable to the different transmission speeds of the different addressee user modems; optimizing a size of a packet to the communications means regardless of upper layers packet size of the communication from the transmitter; carrying out packet transmission with different priorities by means of reservation of channel time based on a quality required by the addressee user modems or groups of addressee user modems; dividing the downstream link in a series of frames with a fixed length where various percentages of the packets sent in the same frame are reserved for the various groups of addressee user modems that share the same quality of service, in terms of criteria selected from reserved bandwidth, maximum latency and combinations thereof; and adapting quality of services (QoS) for a communication traffic to different requests for bandwidth and latency.