Power control for communications systems utilizing high speed shared channels

• US 9,661,593 B2
• Filed: 03/16/2015
• Issued: 05/23/2017
• Est. Priority Date: 10/17/2002
• Status: Active Grant

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Rudolf, Marian, Dick, Stephen G.
• Primary Examiner(s): Wong, Warner
• Application Number:
  US14/658,398
• Publication Number:
  US 20150189607A1
• Time in Patent Office: 799 Days
• CPC Class Codes: H04L 1/1607 Details of the supervisory signal
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04W 52/0238 where the received signal is an unwanted signal, e.g. interference or idle signal
• CPC Class Codes: H04W 52/0245 according to signal strength
• CPC Class Codes: H04W 52/08 Closed loop power control
• CPC Class Codes: H04W 52/10 Open loop power control
• CPC Class Codes: H04W 52/12 Outer and inner loops
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/16 Deriving transmission power values from another channel
• CPC Class Codes: H04W 52/221 using past power control commands
• CPC Class Codes: H04W 52/241 taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
• 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
• CPC Class Codes: H04W 52/325 Power control of control or pilot channels
• CPC Class Codes: H04W 52/54 Signalisation aspects of the TPC commands, e.g. frame structure
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method and apparatus are described for controlling transmitter power in a wireless communication system in which both dedicated and shared channels are utilized. A wireless transmit/receive unit (WTRU) may receive a first channel (e.g., downlink shared channel), power commands for a second channel (e.g., dedicated channel) and power commands for a third channel (e.g., uplink shared channel). The WTRU may transmit in a transmission time interval at least one of the second channel and the third channel. Acknowledgments and negative acknowledgements to signals received over the first channel may be sent on the third channel. The WTRU may determine a transmission power level of the second channel in response to the second channel power commands and not the third channel power commands. The WTRU may determine a transmission power level of the third channel in response to the third channel power commands and not the second channel power commands.

Claims

1. A wireless transmit receive unit (WTRU) comprising:

a receiver operatively coupled to a processor, the receiver and processor configured to receive a first signal over a first channel, power commands for a second channel, and power commands for a third channel;

the processor configured to determine a transmission power level of the second channel in response to the second channel power commands and not the third channel power commands, and to determine a transmission power level of the third channel in response to the third channel power commands and not the second channel power commands; and

a transmitter operatively coupled to the processor, the transmitter and the processor configured to transmit in a transmission time interval at least one of a second signal over the second channel at a power level based on the determined transmission power level of the second channel and a third signal over the third channel at a power level based on the determined transmission power level of the third channel;

wherein acknowledgments and negative acknowledgements to signals received over the first channel are sent on the third channel; and

wherein the third channel is an uplink shared channel.

2. The WTRU of claim 1 wherein the first channel is a downlink shared channel.

3. The WTRU of claim 2 wherein each of the second and third channel power commands indicate one of a step up or a step down in transmission power level.

4. The WTRU of claim 2 wherein the third channel is used for transmission sporadically.

5. The WTRU of claim 2 wherein the second channel is assigned to the WTRU.

6. The WTRU of claim 2 wherein the second channel is a dedicated channel.

7. The WTRU of claim 2 wherein the third channel includes data in addition to the acknowledgements and negative acknowledgements.

15. The WTRU of claim 1 wherein a parameter is determined for at least a transmission time interval;

wherein on a condition that at least one signal on the second channel is transmitted in the at least one transmission time interval, the transmission power level of the second channel is derived from the parameter; and

wherein on a condition that at least one signal on the third channel is transmitted in the at least one transmission time interval, the transmission power level of the third channel is derived from the parameter.

8. A base station comprising:

a transmitter operatively coupled to a processor, the transmitter and the processor configured to transmit a first signal over a first channel, power commands for a second channel and power commands for a third channel;

a receiver operatively coupled to the processor, the receiver and the processor configured to receive in a transmission time interval at least one of a second signal over the second channel and a third signal over the third channel;

wherein the third channel includes acknowledgments and negative acknowledgements to signals received over the first channel; and

wherein the third channel is an uplink shared channel; and

wherein a transmission power level of the second channel is set in response to the second channel power commands and not the third channel power commands, and a transmission power level of the third channel is set in response to the third channel power commands and not the second channel power commands.

9. The base station of claim 8 wherein the first channel is a downlink shared channel, the second channel is a dedicated channel.

10. The base station of claim 9 wherein each of the second and third channel power commands indicate one of a step up or a step down in transmission power level.

11. The base station of claim 9 wherein the third channel is used for reception sporadically.

12. The base station of claim 9 wherein the second channel is assigned to a wireless transmit/receive unit (WTRU).

13. The base station of claim 9 wherein the third channel includes data in addition to the acknowledgements and negative acknowledgements.

14. The base station of claim 9 wherein the second channel is a dedicated channel.

16. The base station of claim 8 wherein a parameter is determined for at least a transmission time interval;

wherein on a condition that at least one signal on the second channel is transmitted in the at least one transmission time interval, the transmission power level of the second channel is derived from the parameter; and

wherein on a condition that at least one signal on the third channel is transmitted in the at least one transmission time interval, the transmission power level of the third channel is derived from the parameter.

17. A method comprising:

receiving, by a wireless transmit/receive unit (WTRU), a first signal over a first channel, power commands for a second channel and power commands for a third channel;

determining, by the WTRU, a transmission power level of the second channel in response to the second channel power commands and not the third channel power commands, and to determine a transmission power level of the third channel in response to the third channel power commands and not the second channel power commands; and

transmitting, by the WTRU, in a transmission time interval at least one of a second signal over the second channel at a power level based on the determined transmission power level of the second channel and a third signal over the third channel at a power level based on the determined transmission power level of the third channel;

wherein acknowledgments and negative acknowledgements to signals received over the first channel are sent on the third channel; and

wherein the third channel is an uplink shared channel.

18. The method of claim 17 wherein the first channel is a downlink shared channel.

19. The method of claim 18 wherein each of the second and third channel power commands indicate one of a step up or a step down in transmission power level.

20. The method of claim 18 wherein the third channel is used for transmission sporadically.

21. The method of claim 18 wherein the second channel is assigned to the WTRU.

22. The method of claim 18 wherein the second channel is a dedicated channel.

23. The method of claim 18 wherein the third channel includes data in addition to the acknowledgements and negative acknowledgements.

24. The method of claim 17 wherein a parameter is determined for at least a transmission time interval;

wherein on a condition that at least one signal on the second channel is transmitted in the at least one transmission time interval, the transmission power level of the second channel is derived from the parameter; and

wherein on a condition that at least one signal on the third channel is transmitted in the at least one transmission time interval, the transmission power level of the third channel is derived from the parameter.