Uplink transmission power determining method and user equipment
View Patent ↗Embodiments of the present invention provide an uplink transmission power determining method and a user equipment. A user equipment determines a transmission situation of at least one of: a PUCCH, a PUSCH, and an SRS on another cell except a secondary cell in a subframe corresponding to a preamble to be transmitted on the secondary cell, so that the user equipment can determine an uplink transmission power of the user equipment according to the determined transmission situation, thereby solving a problem that it is not provided in the prior art that how a user equipment determines an uplink transmission power of the user equipment when random access is executed through a secondary cell.
1. A method to determine uplink transmission power, comprising:
determining, by a user equipment, a physical uplink control channel (PUCCH) needs to be transmitted on a first cell rather than a secondary cell in a second subframe rather than a first subframe among subframes corresponding to a random access preamble to be transmitted on the secondary cell;
determining, by the user equipment, a transmission power of the random access preamble according to a first formula
P PRACH ( i )=min{ P CMAX,c ,PREAMBLE_RECEIVED_TARGET_POWER+ PL c };
and
determining, by the user equipment, a transmission power of the PUCCH according to a second formula
P PUCCH ( i )=min{ P PUCCH _ 0 ,(P CMAX ( i )− P PRACH ( i ))}
wherein i represents a subframe; P PRACH (i) represents the transmission power of the random access preamble; P CMAX (i) represents a maximum allowable power of the secondary cell; PREAMBLE_RECEIVED_TARGET_POWER represents a target received power of the random access preamble; and PL c represents a target path loss of the secondary cell;
wherein P PUCCH (i) represents the transmission power of the PUCCH;
P PUCCH _ 0 represents a transmission power of the PUCCH obtained by the user equipment by performing uplink power control;
transmitting the random access preamble in the first subframe on the secondary cell to achieve uplink synchronization in the secondary cell using the determined transmission power P PRACH (i) and
transmitting the PUCCH on the first cell and in the second subframe using the determined transmission power P PUCCH (i).
2. A user equipment, comprising:
a processor, configured to determine a physical uplink control channel (PUCCH) needs to be transmitted on a first cell rather than a secondary cell in a second subframe rather than a first subframe among subframes corresponding to a random access preamble to be transmitted on the secondary cell; and
a memory coupled to the processor;
wherein the processor is further configured to determine a transmission power of the random access preamble according to a first formula
P PRACH ( i )=min{ P CMAX,c ,PREAMBLE_RECEIVED_TARGET_POWER+PL c };
and
determine a transmission power of the PUCCH according to a second formula
P PUCCH ( i )=min{ P PUCCH _ 0 ,( P CMAX ( i )− P PRACH ( i ))}
wherein i represents a subframe; P PRACH (i) represents the transmission power of the random access preamble; P CMAX (i) represents a maximum allowable power of the secondary cell; PREAMBLE_RECEIVED_TARGET_POWER represents a target received power of the random access preamble; and PL c , represents a target path loss of the secondary cell;
wherein P PUCCH (i) represents the transmission power of the PUCCH;
P PUCCH _ 0 represents a transmission power of the PUCCH obtained by the user equipment by performing uplink power control;
transmitting the random access preamble in the first subframe on the secondary cell to achieve uplink synchronization in the secondary cell using the determined transmission power P PRACH (i) and
transmitting the PUCCH on the first cell and in the second subframe using the determined transmission power P PUCCH (i).