Transmit power control for physical random access channels

• US 10,588,093 B2
• Filed: 04/22/2019
• Issued: 03/10/2020
• 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
• Primary Examiner(s): Cunningham, Kevin M
• Application Number:
  US16/390,968
• Publication Number:
  US 20190253983A1
• Time in Patent Office: 323 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 configured to control operation of a terminal apparatus, the integrated circuit comprising:

circuitry, which, in operation, controls

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

transmitting a random access preamble at a power for physical random access channel (PRACH) transmission over a PRACH of a second component carrier;

responsive to a total transmission power exceeding a maximum output power configured for the terminal apparatus PMAX, adjusting the power for PUSCH transmission so that the adjusted total transmission power does not exceed PMAX at an overlapped portion of the PUSCH transmission in a first subframe of the first component carrier and the PRACH transmission in 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

receiving a random access response to the transmitted random access preamble.

2. The integrated circuit according to claim 1, wherein

the circuitry, in operation, controls

transmitting control information at a power for a physical uplink control channel (PUCCH) transmission over a PUCCH;

and

adjusting at least one of the power for PUSCH transmission and the power for PUCCH transmission.

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 circuitry controls

setting the power for PRACH transmission to zero;

and

adjusting the power for PUSCH transmission so that the adjusted total transmission power including a power for PUCCH transmission on the first component carrier 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 circuity, wherein the at least one output, in operation, outputs data.

10. An integrated circuit configured to control operation of a terminal apparatus, the integrated circuit comprising:

transmission circuitry, which, in operation, controls

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

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

control circuitry, which is coupled to the transmission circuitry and which, responsive to a total transmission power exceeding a maximum output power configured for the terminal apparatus PMAX, adjusts the power for PUSCH transmission so that the adjusted total transmission power does not exceed PMAX at an overlapped portion of the PUSCH transmission in a first subframe of the first component carrier and the PRACH transmission in 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

reception circuitry, which is coupled to the control circuitry and which, in operation, receives a random access response to the transmitted random access preamble.

11. The integrated circuit according to claim 10, wherein

the transmission circuitry, in operation, controls transmission of control information at a power for a physical uplink control channel (PUCCH) transmission over a PUCCH;

and

the control circuitry, in operation, adjusts at least one of the power for PUSCH transmission and the power for PUCCH transmission.

12. The integrated circuit according to claim 11, wherein the control circuitry adjusts only the power for PUSCH transmission.

13. The integrated circuit according to claim 11, wherein the control circuitry adjusts the total transmission power in a priority order of the PRACH, the PUCCH and the PUSCH.

14. The integrated circuit according to claim 11, wherein transmission of the PRACH is initiated by a physical downlink control channel (PDCCH) order.

15. The integrated circuit according to claim 10, 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 control circuitry:

sets the power for PRACH transmission to zero; and

adjusts the power for PUSCH transmission so that the adjusted total transmission power including a power for PUCCH transmission on the first component carrier does not exceed PMAX.

16. The integrated circuit according to claim 10, wherein the control circuitry adjusts the power for PUSCH transmission per subframe.

17. The integrated circuit according to claim 10, wherein when a plurality of PUSCHs are configured on the first component carrier, the control circuitry adjusts the power for PUSCH transmission by reducing respective powers for the plurality of PUSCHs.