RATE ADAPTATION FOR WIFI BASED WIRELESS SENSOR DEVICES

• US 20150098354A1
• Filed: 10/09/2013
• Published: 04/09/2015
• Est. Priority Date: 10/09/2013
• Status: Active Grant

• Current Assignee: Gainspan Corporation (Telit Communications PLC)
• Original Assignee: Gainspan Corporation (Telit Communications PLC)
• Inventors: PREZ GROVAS, ALFREDO EDUARDO DE JESUS
• Granted Patent: US 9,319,907 B2
• Time in Patent Office: Days
• US Class Current: 370/253
• CPC Class Codes: H04W 24/04 Arrangements for maintaining operational condition
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 52/0219 where the power saving management affects multiple terminals
• CPC Class Codes: H04W 52/0225 using monitoring of external events, e.g. the presence of a signal
• CPC Class Codes: H04W 52/0274 by switching on or off the equipment or parts thereof
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A rate selection method for WiFi based wireless sensor devices include storing parameters of communication packets successfully transmitted and received by a wireless device prior to turning off a wireless device, comparing a first set of parameters of a received communication signal to the parameters of the received communication packets and identifying at least one received communication packet of the communication packets based on the comparison of the first set of parameters. The rate selection method also includes comparing a second set of parameters of the received communication signal to the parameters of the identified at least one received communication packet to identify a close received communication packet of the identified at least one received communication packet and identifying a communication rate for current packets communicated by the wireless device based on the comparison of the second set of parameters.

Claims

1. A method comprising:

storing parameters of communication packets successfully transmitted and received by a wireless device prior to turning off the wireless device;

comparing a first set of parameters of a received communication signal to the parameters of the received communication packets;

identifying at least one received communication packet of the communication packets based on the comparison of the first set of parameters;

comparing a second set of parameters of the received communication signal to the parameters of the identified at least one received communication packet to identify a close received communication packet of the identified at least one received communication packet; and

identifying a communication rate for current packets communicated by the wireless device based on the comparison of the second set of parameters.

2. The method of claim 1, in which the first set of parameters comprise communication rates and in which the comparing further comprises comparing the communication rate of the received communication signal and the communication rates of the received communication packets to identify the at least one received communication packet.

3. The method of claim 1, in which the parameters of the communication packets and comprise time packet was transmitted/received, transmission rate for packet transmission, received signal strength indication (RSSI), carrier to interference-plus-noise ratio (CINR), indication of whether the communication packets are acknowledged and/or an indication of whether the packets were transmitted blindly.

4. The method of claim 1, in which the second set of parameters comprises received signal strength indicator (RSSI) and/or carrier to interference-plus-noise ratio (CINR).

5. The method of claim 4, in which comparing the second set of parameters comprises comparing the RSSI and the CINR.

6. The method of claim 4, in which identifying the close received communication packet further comprises determining an absolute value of a difference between the RSSI and/or the CINR of the received communication signal and the identified at least one received communication packet.

7. The method of claim 6, in which the close received communication packet corresponds to an identified at least one received communication packet of the at least one received communication packet with a smallest difference in RSSI and/or the CINR with respect to the received communication signal.

8. The method of claim 7, further comprising calculating a difference between the RSSI of the identified close received communication packet and the RSSI of the received communication signal and calculating the difference between the CINR of the identified close received communication packet and the CINR of the received communication signal.

9. The method of claim 8, further comprising selecting the higher of the absolute value of the difference in RSSI or the absolute value of the difference in CINR to determine a value of the RSSI or the CINR available for current packet transmission by the wireless device.

10. The method of claim 1, in which an initial packet of the packets transmitted by the wireless device prior to identifying of the identifying at least one received communication packet of the communication packets based on the comparison of the first set of parameters comprises a blindly transmitted packet.

11. The method of claim 10, in which a communication rate for the blindly transmitted packet is increased to reduce a likelihood of packet transmission failure.

12. The method of claim 1, in which the at least one received communication packet is transmitted within a predetermined time after a packet of the transmitted communication packets is successfully transmitted by the wireless device.

13. The method of claim 12, in which the packet of the transmitted packets is non-blindly transmitted by the wireless device.

14. The method of claim 1, in which a received packet of the received communication packets is stored if received within a predetermined time after a packet of the transmitted packets is successfully transmitted by the wireless device.

15. An apparatus for wireless communication comprising:

means for storing parameters of communication packets successfully transmitted and received by a wireless device prior to turning off the wireless device;

means for comparing a first set of parameters of a received communication signal to the parameters of the received communication packets;

means for identifying at least one received communication packet of the communication packets based on the comparison of the first set of parameters;

means for comparing a second set of parameters of the received communication signal to the parameters of the identified at least one received communication packet to identify a close received communication packet of the identified at least one received communication packet; and

means for identifying a communication rate for current packets communicated by the wireless device based on the comparison of the second set of parameters.

16. The apparatus of claim 15, in which the first set of parameters comprise a communication rate and in which the means for comparing further comprises means for comparing the communication rate of the received communication signal and the communication rates of the received communication packets to identify the at least one communication packet.

17. The apparatus of claim 15, in which the parameters of the communication packets and comprise time packet was transmitted/received, transmission rate for the packet transmission, received signal strength indication (RSSI), carrier to interference-plus-noise ratio (CINR), indication of whether the communication packets are acknowledged and/or an indication of whether the packets were transmitted blindly.

18. The apparatus of claim 15, in which the second set of parameters comprise received signal strength indicator (RSSI) and/or carrier to interference-plus-noise ratio (CINR).

19. The apparatus of claim 18, in which the means for comparing the second set of parameters comprises means for comparing the RSSI and the CINR.

20. An apparatus for wireless communication, comprising:

a memory; and

at least one processor coupled to the memory and configured;

to store parameters of communication packets successfully transmitted and received by a wireless device prior to turning off the wireless device;

to compare a first set of parameters of a received communication signal to the parameters of the received communication packets;

to identify at least one received communication packet of the communication packets based on the comparison of the first set of parameters;

to compare a second set of parameters of the received communication signal to the parameters of the identified at least one received communication packet to identify a close received communication packet of the identified at least one received communication packet; and

to identify a communication rate for current packets communicated by the wireless device based on the comparison of the second set of parameters.