초록 ▼

Controlling transmission energy in a variable rate communication system that gates out portions of a frame in a predetermined and predicable fashion. In particular, the present invention describes a method and apparatus which identifies closed loop power control commands that have been generated err

Controlling transmission energy in a variable rate communication system that gates out portions of a frame in a predetermined and predicable fashion. In particular, the present invention describes a method and apparatus which identifies closed loop power control commands that have been generated erroneously based on portions of a frame that have been gated. The identified power control commands are ignored. In an alternative embodiment, if identification of the erroneous power control commands occurs after response measures have been taken, the transmitting station responds by setting the transmission energy back to the state it would have been in had the erroneous power control commands been identified prior to the response.

대표청구항 ▼

Controlling transmission energy in a variable rate communication system that gates out portions of a frame in a predetermined and predicable fashion. In particular, the present invention describes a method and apparatus which identifies closed loop power control commands that have been generated err

Controlling transmission energy in a variable rate communication system that gates out portions of a frame in a predetermined and predicable fashion. In particular, the present invention describes a method and apparatus which identifies closed loop power control commands that have been generated erroneously based on portions of a frame that have been gated. The identified power control commands are ignored. In an alternative embodiment, if identification of the erroneous power control commands occurs after response measures have been taken, the transmitting station responds by setting the transmission energy back to the state it would have been in had the erroneous power control commands been identified prior to the response. m 45, wherein the semiconductor devices of the VSC-converter are controlled for changing the switching state thereof and it is started to commutate one or more phase legs of the direct converter by controlling a current valve of that phase leg or those phase legs before the change of switching state of the VSC-converter has been completed, when there is a desire to avoid the state the system appears in after a commutation of the VSC-converter. 57. A method according to claim 56, wherein the voltage across the transformer is detected and the commutation of the direct converter is started based upon information from said voltage detection when, as a consequence of the change of switching state of the VSC-converter commenced, the voltage across the first transformer winding has changed sign and exceeded a certain threshold voltage value. 58. A method according to claim 45, wherein all phase legs of the direct converter are commutated by controlling the current valves of the phase legs of that converter and it is started to control the semiconductor devices of the VSC-converter for changing the switching state thereof before the commutation of all phase legs of the direct converter has been completed, when there is a desire to avoid the state the system appears in after a commutation of all of the phase legs of the direct converter. 59. A method according to claim 58, wherein the current through one of the transformer windings is detected, and that it is started to control the VSC-converter for changing the switching state thereof based upon information from the current detection when, as a consequence of the commutation of the phase legs of the direct converter commenced, the current through the second transformer winding has changed direction and exceeded a certain threshold current value. 60. A method according to claim 41, wherein the order of steps carried out for obtaining commutations of phase legs according to a commutation cycle is optionally changed in case the direct