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

• US 7,536,154 B2
• Filed: 12/03/2003
• Issued: 05/19/2009
• Est. Priority Date: 12/04/2002
• Status: Active Grant

• Current Assignee: Pantech Wireless, LLC (Ideahub, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Dick, Stephen G., Miller, James M., Rudolf, Marian
• Primary Examiner(s): Anderson, Matthew D
• Assistant Examiner(s): Dao, Minh D
• Application Number:
  US10/726,374
• Publication Number:
  US 20040110473A1
• Time in Patent Office: 1,994 Days
• Field of Search: 455/69, 455/562.1, 455/561, 370/335, 370/342, 370/328, 370/329
• US Class Current: 455/69
• 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 improving the reliability of a channel quality indicator (CQI) message in a wireless communications network begins with receipt of the CQI message. The CQI message is then decoded, and a decision metric value for each symbol in the CQI message is computed. A largest decision metric value and a second largest decision metric value for the CQI message are determined. The reliability of the CQI message can be determined by comparing the two largest decision metric values. This method may be applicable to high-speed downlink packet access in time division duplex, frequency division duplex, or other modes of transmission.

Claims

1. A method for determining a channel quality in a wireless communication system, comprising:

receiving a high speed shared control channel (HS-SICH) transmission;

counting a total number of HS-SICH transmissions;

counting a number of failed HS-SICH transmissions;

counting a number of missed HS-SICH transmissions; and

periodically reporting the total number of HS-SICH transmissions, the number of failed HS-SICH transmissions, and the number of missed HS-SICH transmissions over a fixed time period, whereby the reporting is an indication of the channel quality.

2. A base station configured to determine a channel quality, comprising:

a receiver configured to receive a high speed shared control channel (HS-SICH) transmission;

a counter configured to count a total number of HS-SICH transmissions, a number of failed HS-SICH transmissions, and a number of missed HS-SICH transmissions; and

a reporting device configured to periodically report the total number of HS-SICH transmissions, the number of failed HS-SICH transmissions, and the number of missed HS-SICH transmissions over a fixed time period, whereby the report is an indication of the channel quality.

3. A base station configured to determine a channel quality, comprising:

a receiver configured to receive a high speed shared control channel (HS-SICH) transmission;

a first counter configured to count a total number of HS-SICH transmissions;

a second counter configured to count a number of failed HS-SICH transmissions;

a third counter configured to count a number of missed HS-SICH transmissions; and

a reporting device configured to periodically report the values of said first counter, said second counter, and said third counter over a fixed time period, whereby the report is an indication of the channel quality.

4. A wireless transmit/receive unit (WTRU), comprising:

a transmitter configured to transmit a plurality of high speed shared control channel (HS-SICH) transmissions;

a receiver configured to receive a power control command, the power control command being derived by counting a total number of HS-SICH transmissions, counting a number of failed HS-SICH transmissions, counting a number of missed HS-SICH transmissions, and comparing the counted values to a predetermined threshold; and

a transmission power adjusting device configured to adjust an uplink transmission power of the WTRU based on the power control command.