TRANSMIT POWER CONTROL FOR PHYSICAL RANDOM ACCESS CHANNELS

• US 20190253983A1
• Filed: 04/22/2019
• Published: 08/15/2019
• Est. Priority Date: 04/01/2010
• Status: Active Grant

• Current Assignee: Sun Patent Trust
• Original Assignee: Sun Patent Trust
• Inventors: Feuersaenger, Martin, Loehr, Joachim, Aoyama, Takahisa
• Granted Patent: US 10,588,093 B2
• Time in Patent Office: Days
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/281 taking into account user or data type priority
• CPC Class Codes: H04W 52/325 Power control of control or pilot channels
• CPC Class Codes: H04W 52/327 Power control of multicast channels
• CPC Class Codes: H04W 52/34 TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
• CPC Class Codes: H04W 52/346 distributing total power among users or channels
• CPC Class Codes: H04W 56/0045 compensating for timing error by altering transmission time
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 74/004 in the uplink, i.e. towards network
• CPC Class Codes: H04W 74/006 in the downlink, i.e. towards the terminal
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access

Abstract

The invention relates to methods for adjusting the transmit power utilized by a mobile terminal for uplink transmissions, and to methods for adjusting the transmit power used by a mobile terminal for one or more RACH procedures. The invention is also providing apparatus and system for performing these methods, and computer readable media the instructions of which cause the apparatus and system to perform the methods described herein. In order to allow for adjusting the transmit power of uplink transmissions on uplink component carriers, the invention suggests introducing a power scaling for uplink PRACH transmissions performing RACH procedures on an uplink component carrier. The power scaling is proposed on the basis of a prioritization among multiple uplink transmissions or on the basis of the uplink component carriers on which RACH procedures are performed.

Claims

1. An integrated circuit comprising:

circuitry, which, in operation, controls

receiving a transport block transmitted at a power for physical uplink shared channel (PUSCH) transmission over a PUSCH of a first component carrier;

receiving a random access preamble transmitted at a power for physical random access channel (PRACH) transmission over a PRACH of a second component carrier,

wherein the power for PUSCH transmission is determined at a terminal apparatus, and

wherein when a total transmission power exceeds a maximum output power configured for the terminal apparatus PMAX, the power for PUSCH transmission is adjusted at the terminal apparatus so that the adjusted total transmission power does not exceed PMAX at an overlapped portion of the PUSCH transmission on a first subframe of the first component carrier and the PRACH transmission on a second subframe of the second component carrier, the second subframe being a subframe with a time offset from the first subframe along a time axis, wherein the power for PRACH transmission is kept unadjusted; and

transmitting a random access response in response to the random access preamble.

2. The integrated circuit according to claim 1, wherein

the circuitry, in operation, controls

receiving control information transmitted at a power for a physical uplink control channel (PUCCH) transmission over a PUCCH, wherein the power for PUCCH transmission is determined and at least one of the power for PUSCH transmission and the power for PUCCH transmission is adjusted at the terminal apparatus.

3. The integrated circuit according to claim 2, wherein only the power for PUSCH transmission is adjusted.

4. The integrated circuit according to claim 2, wherein the total transmission power is adjusted in a priority order of the PRACH, the PUCCH and the PUSCH.

5. The integrated circuit according to claim 1, wherein the PRACH transmission is initiated by a physical downlink control channel (PDCCH) order.

6. The integrated circuit according to claim 1, wherein when transmission of the random access preamble is not requested and a physical uplink control channel (PUCCH) is transmitted simultaneously with the PUSCH, the power for PRACH transmission is set to zero and a power for PUCCH transmission on the first component carrier is determined and the power for PUSCH transmission is adjusted so that the adjusted total transmission power does not exceed PMAX.

7. The integrated circuit according to claim 1, wherein the power for PUSCH transmission is adjusted per subframe.

8. The integrated circuit according to claim 1, wherein when a plurality of PUSCHs are configured on the first component carrier, the power for PUSCH transmission is adjusted by reducing respective powers for the plurality of PUSCHs.

9. The integrated circuit according to claim 1, comprising:

at least one input coupled to the circuitry, wherein the at least one input, in operation, inputs data; and

at least one output coupled to the circuitry, wherein the at least one output, in operation, outputs data.