Increasing data throughput on a wireless local area network in the presence of intermittent interference

• US 7,143,320 B2
• Filed: 12/31/2001
• Issued: 11/28/2006
• Est. Priority Date: 12/31/2001
• Status: Expired due to Fees

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Cavin, Robert D.
• Primary Examiner(s): Lamarre, Guy J.
• Application Number:
  US10/039,649
• Publication Number:
  US 20030126492A1
• Time in Patent Office: 1,793 Days
• Field of Search: 714/704.4, 370/349, 370/410, 370/333, 370/252, 370/311, 725/110, 455/522, 455/505, 455/506, 455/63.1, 455/78, 455/67.13, 375/346
• US Class Current: 714/704
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0007 by modifying the frame length
• CPC Class Codes: H04L 1/203 Details of error rate determination, e.g. BER, FER or WER
• CPC Class Codes: H04N 21/4126 The peripheral being portable, e.g. PDAs or mobile phones
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

A method for increasing data throughput on a wireless local area network in the presence of intermittent interference. The method of one embodiment comprises receiving a data packet through a wireless channel. Quality of the wireless channel is evaluated. A packet error ratio (PER) value is calculated for the data packet. The PER value is checked as to whether it is within an acceptable level. A determination is made as to whether an intermittent noise is affecting the PER value.

Claims

1. An apparatus comprising:

a wireless transceiver to send and receive data packets of X length via wireless communications;

a network interface card coupled to said wireless transceiver, said network interface card to connect to another wireless device to form a wireless local area network; and

firmware comprising control logic to calculate a packet error ratio (PER) value for said data packets, check whether said PER value is within an acceptable level, determine whether an intermittent interference is affecting said PER value, and step up data transfer rate at which future data packets are to be transmitted if said PER value is greater than a drop rate threshold and if an intermittent interference is detected.

2. The apparatus of claim 1 wherein said control logic is to further determine whether said intermittent interference is due to a frequency hopping spread spectrum (FHSS) wireless device.

3. The apparatus of claim 2 wherein said FHSS wireless device is a Bluetooth device.

4. The apparatus of claim 1 wherein said apparatus is a 802.11(b) protocol compatible wireless device.

5. The apparatus of claim 1 wherein said control logic is further to step down said transfer rate at which said future data packets are to be transmitted if said PER value is greater than said drop rate threshold and a constant noise is detected.

6. The method of claim 5, wherein said control logic is further to step down the data transfer rate only if the current data rate is greater than a lowest data rate.

7. The method of claim 1, wherein said control logic is further to step up the data transfer rate at which future data packets are to be transmitted only if the current data rate is less than a highest data rate.

8. The method of claim 1, wherein said future data packets are of length X.

9. A method comprising:

determining a packet error ratio for transmissions of packets of X length, at a current transmission rate, between two direct-sequence spread spectrum (“

DSSS”

) devices through a wireless channel;

if the packet error ratio is above a predefined threshold, detecting if intermittent interference is present on the wireless channel; and

if intermittent interference is detected, increasing the transmission rate for the wireless channel while maintaining the packet length.

10. The method of claim 9, wherein increasing the transmission rate further comprises:

determining if the current transmission is the highest of a predefined set of transmission rates; and

if the current transmission rate is not the highest of the predefined transmission rates, increasing the transmission rate for the wireless channel.

11. The method of claim 9, further comprising:

if the current transmission rate is the highest of the predefined transmission rates, maintaining the current transmission rate.

12. The method of claim 9, further comprising:

if intermittent interference is not detected, decreasing the transmission rate for the wireless channel.

13. The method of claim 12 wherein:

decreasing the transmission rate further comprises decreasing the transmission rate while maintaining the packet length.

14. A machine readable medium having embodied thereon a computer program, said computer program being executable by a machine to perform a method comprising:

determining a packet error ratio for transmissions of packets of X length, at a current transmission rate, between two direct-sequence spread spectrum (“

DSSS”

) devices through a wireless channel;

if the packet error ratio is above a predefined threshold, detecting if intermittent interference is present on the wireless channel; and

if intermittent interference is detected, increasing the transmission rate for the wireless channel while maintaining the packet length.

15. The machine readable medium of claim 14, wherein the computer program is further executable by a machine to:

determine if the current transmission rate is the highest of a predefined set of transmission rates; and

if the current transmission rate is not the highest of the predefined transmission rates, increase the transmission rate for the wireless channel.