APPARATUS AND METHOD FOR CONTROLLING UPLINK TRANSMISSION POWER IN A MULTIPLE ELEMENT CARRIER WAVE SYSTEM
First Claim
1. A method for controlling uplink transmission power by a user equipment in a multiple component carrier system, comprising:
- generating an uplink signal to be transmitted on a first serving cell;
receiving from a base station random access initiate information commanding initiation of a random access procedure with respect to a second serving cell;
calculating estimated power headroom based on both a first transmission power scheduled for transmission of the uplink signal and a second transmission power scheduled for transmission of a physical random access channel (PRACH) to which a random access preamble is mapped; and
if the estimated power headroom is less than a threshold power, transmitting the uplink signal and the PRACH at the same time by adjusting the first transmission power or the second transmission power based on a power allocation priority or transmitting selectively either the uplink signal or the PRACH based on the power allocation priority.
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Accused Products
Abstract
The present invention relates to an apparatus and method for controlling uplink transmission power in a multiple element carrier wave system. The method for controlling uplink transmission power by a terminal in a multiple element carrier wave system includes the steps of: generating an uplink signal to be transmitted in a first serving cell; receiving, from a base station, random access start information for commanding the start of a random access procedure for a second serving cell; calculating the estimated surplus power from first transmission power scheduled for an uplink signal transmission, and second transmission power scheduled for a transmission of a PRACH to which a random access preamble is mapped; and when the estimated surplus power is smaller than a threshold power, adjusting the first transmission power or the second transmission power on the basis of power allocation priority.
44 Citations
18 Claims
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1. A method for controlling uplink transmission power by a user equipment in a multiple component carrier system, comprising:
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generating an uplink signal to be transmitted on a first serving cell; receiving from a base station random access initiate information commanding initiation of a random access procedure with respect to a second serving cell; calculating estimated power headroom based on both a first transmission power scheduled for transmission of the uplink signal and a second transmission power scheduled for transmission of a physical random access channel (PRACH) to which a random access preamble is mapped; and if the estimated power headroom is less than a threshold power, transmitting the uplink signal and the PRACH at the same time by adjusting the first transmission power or the second transmission power based on a power allocation priority or transmitting selectively either the uplink signal or the PRACH based on the power allocation priority. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A user equipment for controlling uplink transmission power in a multiple component carrier system, comprising:
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a signal generation unit generating an uplink signal to be transmitted on a first serving cell; a reception unit receiving from a base station random access initiate information commanding initiation of a random access procedure with respect to a second serving cell; a power adjustment unit calculating estimated power headroom based on both a first transmission power scheduled for transmission of the uplink signal and a second transmission power scheduled for transmission of a Physical Random Access Channel (PRACH) to which a random access preamble is mapped, comparing the estimated power headroom with a threshold power, and adjusting the first transmission power and the second transmission power based on a power allocation priority; and a transmission unit, if the estimated power headroom is less than threshold power, transmitting the uplink signal and the PRACH at the same time by the adjusted first transmission power and the adjusted second transmission power or transmitting selectively either the uplink signal or the PRACH based on the power allocation priority. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification