System and method for providing signal quality feedback in a wireless network

• US 20030003905A1
• Filed: 06/20/2002
• Published: 01/02/2003
• Est. Priority Date: 06/20/2001
• Status: Abandoned Application

• Current Assignee: Freescale Semiconductor, Inc. (NXP Semiconductors NV)
• Original Assignee: Freescale Semiconductor, Inc. (NXP Semiconductors NV)
• Inventors: Shvodian, William M.
• Application Number:
  US10/175,030
• Publication Number:
  US 20030003905A1
• Time in Patent Office: Days
• US Class Current: 455/423
• CPC Class Codes: H04L 1/0001 Systems modifying transmission characteristics according to link quality, e.g. power backoff adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04
• 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: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 28/22 Negotiating communication rate
• CPC Class Codes: H04W 52/20 using error rate
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/267 taking into account the information rate
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment

Abstract

A method is provided for giving signal quality feedback in a wireless network. First, a transmitting device sends a data packet to a receiving device in a data signal. This data signal is sent at a first transmission power and a first data transmission rate. The receiving device receives the data packet in the data signal and determines a signal quality metric for the data signal. The receiving device then sends an acknowledgement frame to the transmitting device in an acknowledgement signal. The acknowledgement frame includes one or more feedback bits, which indicates a relative signal quality of the data signal. The transmitting device receives the acknowledgement frame in the acknowledgement signal at the transmitting device, and adjusts the first transmission power and the first data transmission rate to a second transmission power and a second data transmission rate, respectively, based on the one or more feedback bits.

Claims

1. A method for providing signal quality feedback in a wireless network, including the steps of:

sending a data packet from a transmitting device to a receiving device in a wireless data signal sent over a wireless link at a first transmission power and a first data transmission rate;

receiving the data packet in the wireless data signal at a receiving device;

determining at the receiving device a signal quality metric for the wireless data signal;

sending an acknowledgement frame from the receiving device to the transmitting device in a wireless acknowledgement signal, the acknowledgement frame including one or more feedback bits indicating a relative signal quality of the wireless data signal;

receiving the acknowledgement frame in the wireless acknowledgement signal at the transmitting device; and

adjusting the first transmission power and the first data transmission rate to a second transmission power and a second data transmission rate, respectively, based on the one or more feedback bits.

2. A method for providing signal quality feedback in a wireless network, as recited in claim 1, wherein the signal quality metric is one of signal-to-noise ratio, bit error rate, or a received signal strength indication.

3. A method for providing signal quality feedback in a wireless network, as recited in claim 1, wherein the acknowledgement frame is an immediate acknowledgement frame.

4. A method for providing signal quality feedback in a wireless network, as recited in claim 1, wherein a first value of the one or more feedback bits indicates that the wireless data signal has a signal quality metric that is above an optimal range.

5. A method for providing signal quality feedback in a wireless network, as recited in claim 4, wherein when the feedback bits have the first value, either the second transmission power is lower than the first transmission power, or the second data transmission rate is higher than the first data transmission rate.

6. A method for providing signal quality feedback in a wireless network, as recited in claim 1, wherein there are two feedback bits.

7. A method for providing signal quality feedback in a wireless network, as recited in claim 6,

wherein a first combination of the two feedback bits indicates that the wireless data signal has a signal quality metric that is above an optimal range,

wherein a second combination of the two feedback bits indicates that the wireless data signal has a signal quality metric that is within an optimal range,

wherein a third combination of the two feedback bits indicates that the wireless data signal has a signal quality metric that is below an optimal range, and

wherein a fourth combination of the two feedback bits indicates that no signal quality information has been provided.

8. A method for providing signal quality feedback in a wireless network, as recited in claim 1, wherein the one or more feedback bits indicate whether the signal quality metric of the wireless data signal is within an optimal range, above an optimal range, or below an optimal range.

9. A method for providing signal quality feedback in a wireless network, as recited in claim 1, wherein adjusting the first transmission power and the first data transmission rate to a second transmission power and a second data transmission rate, respectively, can comprise having the second transmission power equal the first transmission power and having the second data transmission rate equal the first data transmission rate.