Reliability detection of channel quality indicator (CQI) and application to outer loop power control

• US 9,414,314 B2
• Filed: 04/15/2013
• Issued: 08/09/2016
• Est. Priority Date: 12/04/2002
• Status: Active Grant

• Current Assignee: Pantech Wireless, LLC (Ideahub, Inc.)
• Original Assignee: Signal Trust for Wireless Innovation (InterDigital, Inc.)
• Inventors: Rudolf, Marian, Dick, Stephen G., Miller, James M.
• Primary Examiner(s): CATTUNGAL, AJAY P
• Application Number:
  US13/862,735
• Publication Number:
  US 20130223316A1
• Time in Patent Office: 1,212 Days
• US Class Current: 1/1
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0033 arrangements specific to the transmitter
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04L 1/20 using signal quality detector
• CPC Class Codes: H04L 2001/125 Arrangements for preventing errors in the return channel
• CPC Class Codes: H04L 43/16 Threshold monitoring
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04W 28/24 Negotiating SLA [Service Level Agreement]; Negotiating QoS [Quality of Service]
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 52/0225 using monitoring of external events, e.g. the presence of a signal
• CPC Class Codes: H04W 52/12 Outer and inner loops
• CPC Class Codes: H04W 52/20 using error rate
• CPC Class Codes: H04W 52/262 taking into account adaptive modulation and coding [AMC] scheme AMC per se H04L1/0001
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method for performing outer loop power control in wireless communications includes initializing a time interval clock to count down a predetermined time interval; receiving and decoding a channel quality indicator (CQI) message; computing a decision metric value for each symbol in the decoded CQI message; determining whether the CQI message is erroneous; counting a number of erroneous CQI messages; and signaling a wireless/transmit receive unit to adjust an uplink transmission power on a condition that the time interval clock has expired and the number of erroneous CQI messages exceeds a threshold.

Claims

1. A method comprising:

receiving, via a receiver, control channel transmissions;

counting, by the counter circuit, a number of erroneously received control channel transmissions during the time interval;

counting, by the counter circuit, a number of missed control channel transmissions during the time interval; and

reporting, via a transmitter and the counting circuit, the number of erroneously received control channel transmissions, and the number of missed control channel transmissions.

2. The method of claim 1, wherein the time interval is a fixed time interval.

3. The method of claim 1, wherein the steps of counting and reporting are done periodically.

4. The method of claim 1, further comprising:

decoding, by a decoder circuit, the received control channel transmissions; and

computing, by a processor, a decision metric value for each symbol in the decoded control channel transmissions;

wherein whether a received control channel transmission is deemed erroneous is based on the decision metric values.

5. The method of claim 4, wherein the control channel transmissions include channel quality index messages.

6. The method of claim 1, wherein the control channel is a physical uplink control channel.

7. The method of claim 1, wherein the control channel is a high speed dedicated control channel.

8. The method of claim 1, wherein the method is performed by a base station and the control channel transmissions are received from a wireless transmit and receive unit.

9. An apparatus comprising:

a receiver, wherein the receiver receives control channel transmissions;

a counter circuit, wherein the counter circuit counts, during a time interval, a number of erroneously received control channel transmissions, and a number of missed control channel transmissions; and

a transmitter and the counter circuit report the number of erroneously received control channel transmissions, and the number of missed control channel transmissions.

10. The apparatus of claim 9, wherein the time interval is a fixed time interval.

11. The apparatus of claim 9, wherein the counter circuit counts and the transmitter and the counter circuit reports periodically.

12. The apparatus of claim 9, further comprising:

a decoder circuit, wherein the decoder circuit decodes the received control channel transmissions; and

a processor, wherein the processor computes a decision metric value for each symbol in the decoded control channel transmissions;

wherein whether a received control channel transmission is deemed erroneous is based on the decision metric values.

13. The apparatus of claim 12, wherein the control channel transmissions include channel quality index messages.

14. The apparatus of claim 9, wherein the control channel is a physical uplink control channel.

15. The apparatus of claim 9, wherein the control channel is a high speed dedicated control channel.

16. The apparatus of claim 9, wherein the apparatus is a base station and the control channel transmissions are received from a wireless transmit and receive unit.

17. An apparatus comprising:

a receiver, wherein the receiver receives control channel transmissions;

a counter circuit, wherein the counter circuit counts a number of erroneously received control channel transmissions during the time interval;

another counter circuit, wherein the another counter circuit counts a number of missed control channel transmissions during the time interval; and

a transmitter, the counter circuit, and the another counter circuit report the values of said counter circuit, and said another counter circuit.

18. The apparatus of claim 17, wherein the time interval is a fixed time interval.

19. The apparatus of claim 17, wherein the counter and another counter circuits count and the transmitter, the counter circuit, and the another counter circuit reports periodically.

20. The apparatus of claim 17, further comprising:

a decoder circuit, wherein the decoder circuit decodes the received control channel transmissions; and

a processor, wherein the processor computes a decision metric value for each symbol in the decoded control channel transmissions;

wherein whether a received control channel transmission is deemed erroneous or not is based on the decision metric values.

21. The apparatus of claim 20, wherein the control channel transmissions include channel quality index messages.

22. The apparatus of claim 17, wherein the control channel is a physical uplink control channel.

23. The apparatus of claim 17, wherein the control channel is a high speed dedicated control channel.

24. The apparatus of claim 17, wherein the apparatus is a base station and the control channel transmissions are received from a wireless transmit and receive unit.