Method For Controlling the Transmission Power of a Mobile Terminal in a Cellular Radio System and a Terminal For Carrying Out Said Method
First Claim
1. Method of controlling the transmission power of a mobile terminal (10) in communication in a cellular radio system, the terminal (10) receiving power control commands from at least one base station of the cellular system with which a radio link (8) comprising first dedicated uplink and downlink channels is set up, the method comprising the following steps:
- in response to the reception by the terminal of a command to change channels (13), storing (21) a first power level captured from said base station and a reference power with which the terminal was transmitting on the first uplink channel at the time of receiving said command and attempting (22) to continue the call on new dedicated uplink and downlink channels, the terminal ceasing to transmit on the first dedicated uplink channel;
if the continuation of the call on the new channels fails (23), estimating (24) a second power level captured from said base station and resuming transmission (26) from the terminal (10) on the first dedicated uplink channel with a power level determined (25) as a function of the stored reference power and an observed variation between said first and second power levels.
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Accused Products
Abstract
The invention relates to a cellular radio system wherein a communication terminal receives servo power instruction from a base station with which a radio communication comprising first uplink and downlink channels is established. In response to an instruction for changing a channel (13), the terminal records a first power level received from the base station and a reference power on which the terminal transmitted when the instruction was received. The terminal endeavours to continue communication on new uplink and downlink channels interrupting the transmission on the first uplink channel. If failed, the terminal evaluates a second power level received from the base station and restarts to transmit through the first uplink channel at a power determined according to the reference power and a variation between the first and second power level.
46 Citations
13 Claims
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1. Method of controlling the transmission power of a mobile terminal (10) in communication in a cellular radio system, the terminal (10) receiving power control commands from at least one base station of the cellular system with which a radio link (8) comprising first dedicated uplink and downlink channels is set up, the method comprising the following steps:
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in response to the reception by the terminal of a command to change channels (13), storing (21) a first power level captured from said base station and a reference power with which the terminal was transmitting on the first uplink channel at the time of receiving said command and attempting (22) to continue the call on new dedicated uplink and downlink channels, the terminal ceasing to transmit on the first dedicated uplink channel; if the continuation of the call on the new channels fails (23), estimating (24) a second power level captured from said base station and resuming transmission (26) from the terminal (10) on the first dedicated uplink channel with a power level determined (25) as a function of the stored reference power and an observed variation between said first and second power levels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. Mobile radio communication terminal (10), comprising:
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means for communicating with at least one base station of a cellular radio system on a radio link comprising first dedicated uplink and downlink channels, the communication means comprising means for controlling the transmission power on the first dedicated uplink channel as a function of power control commands received from said base station; means for storing, in response to the terminal receiving a command to change channels, a first power level captured from said base station and a reference power with which the terminal was transmitting on the first uplink channel at the time of receiving said command and attempting to continue the call on new dedicated uplink and downlink channels, the terminal ceasing to transmit on the first dedicated uplink channel; means for estimating, if the continuation of the call on the new channels fails, a second power level captured from said base station and resuming sending on the first dedicated uplink channel with a power level determined as a function of the stored reference power and an observed variation between said first and second power levels. - View Dependent Claims (11, 12, 13)
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Specification