Patent ID: 7308281
Filing Date: 2007-12-11
Classification: H04L,H04W

Abstract:
1. An adaptive or variable phy mode transmission system with automatic power control comprising: at least one master station; and at least one terminal station, said terminal station adapted to regulate its transmit power when a signaling message is received from the master station on a communication channel, wherein said master station is adapted to: generate signaling messages to control a first quality parameter at a reference level predefined for each of a plurality of phy modes used by the terminal station for transmissions, the first quality parameter being determined from a transmission from the terminal station to the master station; store a parameter concerning an available unused power margin in the terminal station; and generate additional signaling messages that control transitions between the plurality of phy modes in each terminal station, taking into account at least for transitions to a more efficient phy mode at least said parameter concerning the available unused power margin, wherein each of the plurality of phy modes includes a particular combination of modulation and forward error check (FEC) schemes, and wherein the transitions between the plurality of phy modes in each terminal station are performed in such a manner that a transition from a first to second phy mode is initiated based on the available unused power margin, while a transition from the second to first phy mode is not dependent on the available unused power margin.