Carrier assignment for multi-carrier modulation in wireless communication

• US 10,064,179 B2
• Filed: 11/19/2009
• Issued: 08/28/2018
• Est. Priority Date: 02/18/2003
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Vijayan, Rajiv, Agrawal, Avneesh, Jha, Sanjay
• Primary Examiner(s): Bilodeau, David
• Application Number:
  US12/622,202
• Publication Number:
  US 20100067474A1
• Time in Patent Office: 3,204 Days
• Field of Search: 455 69, 455450, 455 631, 455407, 455408, 455441, 4554561, 370335
• CPC Class Codes: H04L 27/2614 Peak power aspects
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/0066 Requirements on out-of-channel emissions
• CPC Class Codes: H04W 52/343 taking into account loading or congestion level
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA

Abstract

Techniques for managing peak-to-average power ratio (PAPR) for multi-carrier modulation in wireless communication systems. Different terminals in a multiple-access system may have different required transmit powers. The number of carriers to allocate to each terminal is made dependent on its required transmit power. Terminals with higher required transmit powers may be allocated fewer carriers (associated with smaller PAPR) to allow the power amplifier to operate at higher power levels. Terminals with lower required transmit powers may be allocated more carriers (associated with higher PAPR) since the power amplifier is operated at lower power levels. The specific carriers to assign to the terminals may also be determined by their transmit power levels to reduce out-of-band emissions. Terminals with higher required transmit powers may be assigned with carriers near the middle of the operating band, and terminals with lower required transmit powers may be assigned with carriers near the band edges.

Claims

1. A method for multi-carrier communications, comprising:

transmitting, from an access terminal to an access point in an access network, information regarding transmit power of the access terminal to be scheduled for data transmission, the information regarding transmit power of the access terminal comprising an indication of a required transmit power for the access terminal and an indication of a maximum transmit power of the access terminal; and

receiving, from the access network, an assignment message indicating a number of carriers assigned to the access terminal based on the information regarding transmit power of the access terminal transmitted from the access terminal, wherein at least two carriers are assigned to the access terminal for simultaneous data transmission.

2. The method of claim 1, wherein the required transmit power corresponds to a desired received signal quality.

3. The method of claim 1, further comprising transmitting data using the assigned carriers and for a scheduled time period.

4. The method of claim 1, wherein the information regarding transmit power of the access terminal comprises a computed difference between the maximum transmit power for the access terminal and the required transmit power for the access terminal.

5. The method of claim 4, wherein the number of carriers assigned to the access terminal is determined further based on required back-off power for different number of carriers for the access terminal.

6. The method of claim 1, wherein the required transmit power for the access terminal is dependent on at least a particular path loss from the access terminal to the access point.

7. The method of claim 1, wherein the maximum transmit power for the access terminal corresponds to a peak power level of a power amplifier used by the access terminal.

8. The method of claim 1 wherein a power control command received at the access terminal is based on a received signal quality of the signal estimated at the access point.

9. An apparatus in a multi-carrier communication system, comprising:

a controller configured to control transmitting, from an access terminal to an access point in an access network, information regarding transmit power of the access terminal to be scheduled for data transmission, the information regarding transmit power of the access terminal comprising an indication of a required transmit power for the access terminal and an indication of a maximum transmit power of the access terminal, and to control receiving, from the access network, an assignment message indicating a number of carriers assigned to the access terminal based on the information regarding transmit power of the access terminal transmitted from the access terminal, wherein at least two carriers are assigned to the access terminal for simultaneous data transmission; and

transceiver circuitry coupled to the controller.

10. The apparatus of claim 9, wherein the required transmit power corresponds to a desired received signal quality.

11. The apparatus of claim 9, wherein the controller is further configured to control transmitting data using the assigned carriers and for a scheduled time period.

12. The apparatus of claim 9, wherein the apparatus comprises the access terminal.

13. The apparatus of claim 9, wherein the required transmit power for the access terminal is dependent on at least a particular path loss from the access terminal to the access point.

14. The apparatus of claim 9, wherein the maximum transmit power for the access terminal corresponds to a peak power level of a power amplifier used by the access terminal.

15. The apparatus of claim 9 wherein a power control command received at the access terminal is based on a received signal quality of the signal estimated at the access point.

16. An apparatus in a multi-carrier communication system, comprising:

means for transmitting, from an access terminal to an access point in an access network, information regarding transmit power of the access terminal to be scheduled for data transmission, the information regarding transmit power of the access terminal comprising an indication of a required transmit power for the access terminal and an indication of a maximum transmit power of the access terminal; and

means for receiving, from the access network, an assignment message indicating a number of carriers assigned to the access terminal based on the information regarding transmit power of the access terminal transmitted from the access terminal, wherein at least two carriers are assigned to the access terminal for simultaneous data transmission.

17. The apparatus of claim 16, wherein the required transmit power corresponds to a desired received signal quality.

18. The apparatus of claim 16, further comprising means for transmitting data using the assigned carriers and for a scheduled time period.

19. A computer-readable non-transitory storage medium comprising code, which when executed by a machine, causes the machine to perform operations in a multi-carrier communication system, the computer-readable storage medium comprising:

code for transmitting, from an access terminal to an access point in an access network, information regarding transmit power of the access terminal to be scheduled for data transmission, the information regarding transmit power of the access terminal comprising an indication of a required transmit power for the access terminal and an indication of a maximum transmit power of the access terminal; and

code for receiving, from the access network, an assignment message indicating a number of carriers assigned to the access terminal based on the information regarding transmit power of the access terminal transmitted from the access terminal, wherein at least two carriers are assigned to the access terminal for simultaneous data transmission.

20. The computer-readable non-transitory storage medium of claim 19, wherein the required transmit power corresponds to a desired received signal quality.

21. The computer-readable non-transitory storage medium of claim 19, further comprising code for transmitting data using the assigned carriers and for a scheduled time period.