Method of power allocation and rate control in OFDMA systems

• US 20040062192A1
• Filed: 09/30/2002
• Published: 04/01/2004
• Est. Priority Date: 09/30/2002
• Status: Active Grant

• Current Assignee: WSOU Investments, LLC (WSOU Holdings, LLC)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Su, Hsuan-Jung, Liu, Jung-Tao
• Granted Patent: US 7,426,176 B2
• Time in Patent Office: Days
• US Class Current: 370/208
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04W 52/265 taking into account the quality of service QoS
• CPC Class Codes: H04W 52/267 taking into account the information rate

Abstract

A method of data communication. The method includes initially receiving one or more channel quality information signals from each wireless unit. The channel quality information may be received in response to the transmission of one or more pilot signals. Once the channel quality information signal(s) from each wireless unit are received, the method then includes selecting one or more transmit powers and one or more transmission rates for each wireless unit. Thereafter, one or more blocks of orthogonal continuous waveforms may be transmitted over a channel to each wireless unit using the selected transmit power and selected transmission rate.

Claims

1. A method comprising:

in response to channel information, selecting at least one transmit power for transmitting at least one block of tones over a channel.

2. The method of claim 1, wherein the channel information comprises at least one channel quality indicator signal.

3. The method of claim 2, wherein the channel is defined by at least one of a code division, time division, and/or frequency division multiple access system.

4. The method of claim 2, wherein the quality indicator signal is received in response to at least one pilot signal being transmitted.

5. The method of claim 4, wherein the at least one block comprises at least two tones, and the at least two tones comprises at least two time orthogonal continuous waveforms.

6. The method of claim 5, wherein the at least two time orthogonal continuous waveforms comprises at least two sinusoids having frequencies that are integer multiples of a fixed positive value.

7. The method of claim 6, wherein each sinusoid comprises at least one data bit.

8. The method of claim 4, wherein the at least one transmit power is selected for downlink data transmission.

9. The method of claim 8, further comprising:

in response to the channel quality indicator signal, selecting at least one transmission rate.

10. The method of claim 9, wherein the at least one transmission rate is selected for downlink data transmission.

11. The method of claim 10, wherein the step of selecting at least one transmit power and the step selecting at least one transmission rate are performed jointly.

12. A method for managing the resources of a base station amongst a number of wireless units, the method comprising:

receiving at least one channel quality information signal from each wireless unit; and

in response to the channel quality information signal of each wireless unit, selecting at least one transmit power and selecting at least one transmission rate for each wireless unit.

13. The method of claim 12, wherein the step of selecting at least one transmit power and the step of selecting at least one transmission rate are performed jointly.

14. The method of claim 13, further comprising:

transmitting at least one block of orthogonal continuous waveforms over a channel to each wireless unit employing the selected transmit power and selected transmission rate.

15. The method of claim 14, wherein the at least one channel quality indicator signal is received in response to at least one pilot signal being transmitted to each wireless unit.

16. The method of claim 14, wherein the channel is defined by at least one of a code division, time division, and/or frequency division multiple access system.

17. The method of claim 14, wherein the at least one block of orthogonal continuous waveforms comprises at least two sinusoids having frequencies that are integer multiples of a fixed positive value.

18. The method of claim 17, wherein each sinusoid comprises at least one data bit.

19. The method of claim 14, wherein the at least one transmit power is selected for downlink data transmission.

20. The method of claim 14, wherein the at least one transmission rate is selected for downlink data transmission.