Apparatus and method for controlling uplink transmission power in a multiple element carrier wave system
View Patent ↗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.
1. A communication method performed by a user equipment, comprising:
generating an uplink signal to be transmitted on a first serving cell;
generating a random access preamble to be transmitted on a second serving cell;
calculating a summation of a first power to transmit the uplink signal and a second power to transmit the random access preamble;
determining an adjusted power to transmit the uplink signal based on the summation of the first power and the second power;
transmitting, to an evolved-NodeB (eNB), the uplink signal on the first serving cell using the adjusted power; and
transmitting, to the eNB, the random access preamble on the second serving cell using the second power.
2. The method of claim 1 , further comprising receiving, from the eNB, random access initiate information commanding initiation of a random access procedure, wherein the random access initiate information includes an index of the random access preamble.
3. The method of claim 1 , wherein the adjusted power is determined by comparing the summation of the first power and the second power with a threshold value.
4. The method of claim 1 , wherein the uplink signal is transmitted through a Physical Uplink Control Channel (PUCCH).
5. The method of claim 1 , wherein the uplink signal is transmitted through a Physical Uplink Shared Channel (PUSCH).
6. The method of claim 1 , wherein the uplink signal comprises a Sounding Reference Signal (SRS).
7. The method of claim 1 , wherein the uplink signal comprises at least one of an ACK/NACK signal, Channel Quality Information (CQI), and a rank indicator.
8. A communication apparatus comprising:
a memory; and
a processor operably coupled to the memory,
wherein the processor, when executing program instructions stored in the memory, is configured to:
generate an uplink signal to be transmitted on a first serving cell;
generate a random access preamble to be transmitted on a second serving cell;
calculate a summation of a first power to transmit the uplink signal and a second power to transmit the random access preamble;
determine an adjusted power to transmit the uplink signal based on the summation of the first power and the second power;
cause the communication apparatus to transmit, to an evolved-NodeB (eNB), the uplink signal on the first serving cell using the adjusted power; and
cause the communication apparatus to transmit, to the eNB, the random access preamble on the second serving cell using the second power.
9. The communication apparatus of claim 8 , wherein the processor is further configured to cause the communication apparatus to receive, from the eNB, random access initiate information commanding initiation of a random access procedure, wherein the random access initiate information includes an index of the random access preamble.
10. The communication apparatus of claim 8 , wherein the adjusted power is determined by comparing the summation of the first power and the second power with a threshold value.
11. The communication apparatus of claim 8 , wherein the uplink signal is transmitted through a Physical Uplink Control Channel (PUCCH).
12. The communication apparatus of claim 8 , wherein the uplink signal is transmitted through a Physical Uplink Shared Channel (PUSCH).
13. The communication apparatus of claim 8 , wherein the uplink signal comprises a Sounding Reference Signal (SRS).
14. The communication apparatus of claim 8 , wherein the uplink signal comprises at least one of an ACK/NACK signal, Channel Quality Information (CQI), and a rank indicator.
15. A device for a user equipment (UE) comprising:
a memory; and
a processor operably coupled to the memory,
wherein the processor, when executing program instructions stored in the memory, is configured to:
generate an uplink signal to be transmitted on a first serving cell;
generate a random access preamble to be transmitted on a second serving cell;
calculate a summation of a first power to transmit the uplink signal and a second power to transmit the random access preamble;
determine an adjusted power to transmit the uplink signal based on the summation of the first power and the second power;
cause the UE to transmit, to an evolved-NodeB (eNB), the uplink signal on the first serving cell using the adjusted power; and
cause the UE to transmit, to the eNB, the random access preamble on the second serving cell using the second power.
16. The device of claim 15 , wherein the processor is further configured to cause the UE to receive, from the eNB, random access initiate information commanding initiation of a random access procedure, wherein the random access initiate information includes an index of the random access preamble.
17. The device of claim 15 , wherein the adjusted power is determined by comparing the summation of the first power and the second power with a threshold value.
18. The device of claim 15 , wherein the uplink signal is transmitted through a Physical Uplink Control Channel (PUCCH).
19. The device of claim 15 , wherein the uplink signal is transmitted through a Physical Uplink Shared Channel (PUSCH).
20. The device of claim 15 , wherein the uplink signal comprises at least one of an ACK/NACK signal, Channel Quality Information (CQI), and a rank indicator.