WLAN TDM protocal

• US 20060159053A1
• Filed: 12/19/2005
• Published: 07/20/2006
• Est. Priority Date: 01/18/2005
• Status: Active Grant

• Current Assignee: Marvell Asia Pte Limited (Marvell Technology Group Limited)
• Original Assignee: Marvell World Trade Limited (Marvell Technology Group Limited)
• Inventors: Donovan, Timothy J.
• Granted Patent: US 7,751,374 B2
• Time in Patent Office: Days
• US Class Current: 370/338
• CPC Class Codes: H04W 48/10 using broadcasted information
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 76/20 Manipulation of established connections
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A wireless network device comprises an RF transceiver that transmits and receives data packets and that periodically transmits or receives a beacon. A control module communicates with the RF transceiver, determines a default interframe space (IFS) time based on the beacon, and selects one of the default IFS time and a second IFS time that is less than or equal to the default IFS time based on a number of data packets received after the beacon.

Claims

1. A wireless network device comprising:

an RF transceiver that transmits and receives data packets and that periodically transmits or receives a beacon; and

a control module that communicates with the RF transceiver, that determines a default interframe space (IFS) time based on the beacon and that selects one of the default IFS time and a second IFS time that is less than or equal to the default IFS time based on a number of data packets received after the beacon.

2. The wireless network device of claim 1 wherein the beacon includes data that is indicative of a transmission position m for the wireless network device.

3. The wireless network device of claim 2 wherein the control module selects the second IFS time when the RF transceiver receives m−

1 data packets.

4. The wireless network device of claim 3 wherein the control module selects the default IFS time when the RF transceiver has received fewer than m−

1 data packets.

5. The wireless network device of claim 1 wherein the control module includes an IFS timer that is reset when data packets are received and wherein the RF transceiver transmits a data packet after one of the default IFS time and the second IFS time.

6. The wireless network device of claim 1 further comprising a power management module that transitions the wireless network device between an active mode and an inactive mode.

8. The wireless network device of claim 6 wherein the power management module transitions the wireless network device to the inactive mode after the RF transceiver transmits a data packet.

9. A wireless network comprising the wireless network device of claim 6 and further comprising N−

1 other wireless network devices, wherein the power management module transitions the wireless network device to the inactive mode after all of the N wireless network devices transmit a data packet.

10. A wireless network comprising a plurality of the wireless network devices of claim 6, wherein the power management module transitions the wireless network devices to the inactive mode after an idle time on the network that is greater than a largest available IFS time.

11. A wireless network comprising a plurality of the wireless network devices of claim 1, wherein one of the wireless network devices is a coordinator that periodically transmits the beacon to the plurality of wireless network devices.

7. The wireless network device of clam 6 wherein the power management module transitions the wireless network device to the active mode prior to a scheduled beacon time.

12. A wireless network device comprising:

transmitting and receiving means for transmitting and receiving data packets and for periodically transmitting or receiving a beacon; and

control means for communicating with the transmitting and receiving means, for determining a default interframe space (IFS) time based on the beacon, and for selecting one of the default IFS time and a second IFS time that is less than or equal to the default IFS time based on a number of data packets received after the beacon.

13. The wireless network device of claim 12 wherein the beacon includes data that is indicative of a transmission position m for the wireless network device.

14. The wireless network device of claim 13 wherein the control means selects the second IFS time when the transmitting and receiving means receives m−

1 data packets.

15. The wireless network device of claim 14 wherein the control means selects the default IFS time when the transmitting and receiving means has received fewer than m−

1 data packets.

16. The wireless network device of claim 12 wherein the control means includes timing means for monitoring IFS times, the timing means is reset when data packets are received, and the transmitting and receiving means transmits a data packet after one of the default IFS time and the second IFS time.

17. The wireless network device of claim 12 further comprising power management means for transitioning the wireless network device between an active mode and an inactive mode.

19. The wireless network device of claim 17 wherein the power management means transitions the wireless network device to the inactive mode after the transmitting and receiving means transmits a data packet.

20. A wireless network comprising the wireless network device of claim 17 and further comprising N−

1 other wireless network devices, wherein the power management means transitions the wireless network device to the inactive mode after all of the N wireless network devices transmit a data packet.

21. A wireless network comprising a plurality of the wireless network devices of claim 17, wherein the power management means transitions the wireless network devices to the inactive mode after an idle time on the network that is greater than a largest available IFS time.

22. A wireless network comprising a plurality of the wireless network devices of claim 12, wherein one of the wireless network devices is a coordinator that periodically transmits the beacon to the plurality of wireless network devices.

18. The wireless network device of clam 17 wherein the power management means transitions the wireless network device to the active mode prior to a scheduled beacon time.

23. A method for transmitting and receiving data with a wireless network device, comprising:

at least one of transmitting and receiving data packets;

at least one of periodically receiving and transmitting a beacon;

determining a default interframe space (IFS) time based on the beacon; and

selecting one of the default IFS time and a second IFS time that is less than or equal to the default IFS time based on a number of data packets received after the beacon.

24. The method of claim 23 wherein the beacon includes data that is indicative of a transmission position m for the wireless network device.

25. The method of claim 24 wherein the step of selecting includes selecting the second IFS time after receiving m−

1 data packets.

26. The method of claim 25 wherein the step of selecting includes selecting the default IFS time when fewer than m−

1 data packets are received.

27. The method of claim 23 further comprising resetting an IFS timer when data packets are received and transmitting a data packet after one of the default IFS time or the second IFS time.

28. The method of claim 23 further comprising transitioning the wireless network device between an active mode and an inactive mode.

30. The method of claim 28 wherein the step of transitioning includes transitioning the wireless network device to the inactive mode after transmitting a data packet.

31. The method of claim 28 further comprising transitioning the wireless network device to the inactive mode after N wireless network devices transmit a data packet, wherein N is a number of wireless network devices in a wireless network including the wireless network device.

32. The method of claim 28 further comprising transitioning the wireless network device to the inactive mode after an idle time on a wireless network including the wireless network device that is greater than a largest available IFS time.

33. The method of claim 23 further comprising transmitting the beacon to a plurality of other wireless network devices.

29. The method of Clam 28 wherein the step of transitioning includes transitioning the wireless network device to the active mode prior to a scheduled beacon time.

34. A computer program executed by a processor, comprising:

at least one of transmitting and receiving data packets;

at least one of periodically receiving and transmitting a beacon;

determining a default interframe space (IFS) time based on the beacon; and

selecting one of the default IFS time and a second IFS time that is less than or equal to the default IFS time based on a number of data packets received after the beacon.

35. The computer program of claim 34 wherein the beacon includes data that is indicative of a transmission position m for a wireless network device.

36. The computer program of claim 35 wherein the step of selecting includes selecting the second IFS time after receiving m−

1 data packets.

37. The computer program of claim 36 wherein the step of selecting includes selecting the default IFS time when fewer than m−

1 data packets are received.

38. The computer program of claim 34 further comprising resetting an IFS timer when data packets are received and transmitting a data packet after one of the default IFS time or the second IFS time.

39. The computer program of claim 35 further comprising transitioning the wireless network device between an active mode and an inactive mode.

40. The computer program of claim 39 wherein the step of transitioning includes transitioning the wireless network device to the active mode prior to a scheduled beacon time.

41. The computer program of claim 39 wherein the step of transitioning includes transitioning the wireless network device to the inactive mode after transmitting a data packet.

42. The computer program of claim 39 further comprising transitioning the wireless network device to the inactive mode after N wireless network devices transmit a data packet, wherein N is a number of wireless network devices in a wireless network including the wireless network device.

43. The computer program of claim 39 further comprising transitioning the wireless network device to the inactive mode after an idle time on a wireless network including the wireless network device that is greater than a largest available IFS time.

44. The computer program of claim 34 further comprising transmitting the beacon to a plurality of wireless network devices.