Rapid channel quality based power control for high speed channels

• US 20060135193A1
• Filed: 12/20/2004
• Published: 06/22/2006
• Est. Priority Date: 12/20/2004
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Xiao, Weimin, Ghosh, Amitava, Ratasuk, Rapeepat, Wang, Fan, Whinnett, Nick W.
• Granted Patent: US 7,242,956 B2
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04W 52/143 Downlink power control
• CPC Class Codes: H04W 52/223 predicting future states of the transmission
• CPC Class Codes: H04W 52/241 taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
• CPC Class Codes: H04W 52/247 where the output power of a terminal is based on a path parameter sent by another terminal

Abstract

A method (400) and apparatus (501) provide for rapid power control based on a quality related value, e.g. channel quality indicator (CQI) value. A transmit power level can be derived from a CQI value received according to a time period, e.g. corresponding to 500 Hz. A first predicted value can be predicted based on the CQI value, at a first time within the time period and a power adjustment value can be determined based on the CQI value as well as the first predicted value at a rate that exceeds the rate of receiving the CQI values. Note that other predicted values for or corresponding to the CQI value can be predicted at other times within the time period and that power adjustment values can be determined through interpolation between predicted values for any time within the period.

Claims

1. A method for performing rapid power control in an infrastructure component associated with a Radio Access Network (RAN), the method comprising:

translating a quality value received on an uplink channel from a User Equipment (UE) into a transmit power value associated with a downlink channel, the quality value corresponding to a channel as received by the UE, the quality value received according to a time period; and

generating a first predicted value for the quality value at a first time increment during the time period.

2. A method according to claim 1, further comprising generating an adjusted transmit power value based on the first predicted value.

3. A method according to claim 1, further comprising generating a second predicted value for the quality value at a second time increment during the time period, the second time increment different from the first time increment.

4. A method according to claim 3, wherein the second predicted value includes a value H(n) and wherein the generating the second predicted value includes generating the second predicted value according to the relation:

5. A method according to claim 3, further comprising generating an adjusted transmit power value based on the first predicted value and the second predicted value.

6. A method according to claim 5, wherein the generating the adjusted transmit value includes interpolating between the first predicted value and the second predicted value.

7. A method according to claim 1, wherein the quality value includes a Channel Quality Indicator (CQI).

8. A method according to claim 1, wherein the infrastructure component include a Node B transceiver.

9. A method according to claim 1, wherein the time period corresponds to a first frequency of receiving the quality value and the first predicted value for the quality value is generated at a prediction frequency at least equal to the first frequency, wherein each quality value and first predicted value are, respectively, translated into the transmit power value at a frequency exceeding the first frequency.

10. A method according to claim 1, wherein the first predicted value includes a value H(n) and wherein the generating the first predicted value includes generating the first predicted value according to the relation:

11. A method for performing rapid power control in a transceiver associated with a Radio Access Network (RAN), the method comprising:

deriving a first value associated with a transmit power on a downlink channel from a second value received on an uplink channel from a User Equipment (UE) the second value received according to a time period;

generating a first predicted value for the second value at a first time within the time period; and

generating a second predicted value for the second value at a second time within the time period, the second time different from the first time.

12. A method according to claim 11, further comprising interpolating between the first predicted value and the second predicted value to generate an adjusted transmit power value for any time within the time period.

13. A method according to claim 11, wherein the second value includes a Channel Quality Indicator (CQI).

14. An apparatus in an infrastructure component comprising:

an RF interface;

a memory;

a processor coupled to the memory and the RF interface, the processor configured to;

translate a first value received from an uplink channel associated with the RF interface into a second value for a downlink channel associated with the RF interface, the first value received according to a time period; and

predict, based on at least the first value, a first predicted value for the second value at a first time within the time period.

15. An apparatus in accordance with claim 14, wherein the uplink channel includes a High Speed Dedicated Physical Control Channel (HS-DPCCH) channel and the first value includes a Channel Quality Indicator (CQI).

16. An apparatus in accordance with claim 14, wherein the downlink channel includes a High Speed Shared Control Channel (HS-SCCH) channel and the second value includes a transmit power level.

17. An apparatus in accordance with claim 14, wherein the infrastructure component includes a Node B transceiver.

18. An apparatus in accordance with claim 14 wherein the processor is further configured to predict a second predicted value for the second value at a second time within the time period.

19. An apparatus according to claim 18, wherein the processor, in predicting the first predicted value, is configured to update a first set of weights using a recursive least squares procedure and in predicting the second predicted value, is configured to update a second set of weights using the recursive least squares procedure.

20. An apparatus according to claim 18, wherein the time period corresponds to a frequency of reporting a Channel Quality Indicator (CQI) and the first predicted value and the second predicted value are used to increase a rate of performing transmit power control on a HS-SCCH channel.