Optimizing 802.11 power-save for VLAN

• US 7,489,648 B2
• Filed: 03/11/2004
• Issued: 02/10/2009
• Est. Priority Date: 03/11/2004
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Griswold, Victor J.
• Primary Examiner(s): NGUYEN, HANH N
• Application Number:
  US10/798,040
• Publication Number:
  US 20050201341A1
• Time in Patent Office: 1,797 Days
• Field of Search: 370/310, 370/338, 370/346, 370/352, 370/386, 370/389, 370/395.1, 370/447, 370/328, 370/392
• US Class Current: 370/311
• CPC Class Codes: H04W 4/06 Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0219 where the power saving management affects multiple terminals
• CPC Class Codes: H04W 72/12 Wireless traffic scheduling
• CPC Class Codes: H04W 72/30 Resource management for broadcast services
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method for an access point to provide immediate delivery of low-latency data packets to one virtual local area network when there are one or more associated stations operating in Power-Save-Protocol on another virtual local area network. The access point observes all the virtual local area networks to which it provides access to associated stations. The access point then determines which of the virtual local area networks contains only active stations. The access point then tracks the virtual local area network having only active stations and immediately transmits to the network incoming multicast/broadcast data packets.

Claims

1. A method for an access point having a basic service set comprising a plurality of associated stations operating in a plurality operative modes to provide immediate delivery of low-latency multicast/broadcast data packets to at least one of a plurality of virtual local area networks, the steps comprising:

monitoring, at the access point, all virtual local area networks comprising at least one station associated with the access point;

determining, for each monitored virtual local area network, those virtual local area networks having all associated stations operating in active mode;

identifying, via the access point, the at least one virtual local area network having all associated stations in active mode operation; and

transmitting low-latency multicast/broadcast data packets immediately to the at least one identified virtual local area network;

wherein the basic service set includes at least one associated station operating in power-save mode.

2. The method of claim 1, wherein the access point is an 802.11access point.

3. The method of claim 1, wherein each station in active mode is in 802.11constantly active operation supporting low-latency data transmission.

4. The method of claim 1, further comprising the step of identifying at least one virtual local area network having the at least one associated station operating in power-save mode.

5. The method of claim 4, wherein each associated station operating in power-save mode is in 802.11power-save protocol operation.

6. The method of claim 5, further comprising the step of buffering the multicast/broadcast data packets for the at least one virtual local area network having the at least one associated station in power-save protocol operation.

7. The method of claim 6, further comprising the step of transmitting the buffered multicast/broadcast data packets with a data traffic indicator mark.

8. The method of claim 1, wherein the associated station is a portable personal computer.

9. The method of claim 1, wherein the associated station is a personal data assistant.

10. In a network comprising at least one access point, a plurality of virtual local area networks and a plurality of associated stations in an associated basic service set operating in a plurality of operative modes, a system for automatically optimizing delivery of low-latency multicast/broadcast data packets over at least one of the virtual local area networks, comprising

means for monitoring, at the access point, all virtual local area networks comprising at least one station associated with the access point;

means for determining, for each monitored virtual local area network, those networks having all associated stations operating in active mode;

means for identifying, via the access point, at least one virtual local area network having all associated stations in active mode operation; and

means for transmitting low-latency multicast/broadcast data packets immediately to the at least one identified virtual local area network;

wherein the basic service set includes at least one associated station operating in power-save mode.

11. The system of claim 10 wherein the access point is an 802.11access point.

12. The system of claim 10 wherein associated station in active mode is in 802.11constantly active operation supporting low-latency data transmission.

13. The system of claim 10, further comprising means for identifying at least one virtual local area network having at the least one associated station operating in power-save mode.

14. The system of claim 13, wherein each associated station operating in power-save mode is in 802.11power-save protocol operation.

15. The system of claim 14, further comprising means for buffering the multicast/broadcast data packets for the at least one virtual local area network having the at least one associated station in power-save protocol operation.

16. The system of claim 15, further comprising means for transmitting the buffered multicast/broadcast data packets with a data traffic indicator mark.

17. The system of claim 10, wherein the associated station is a portable personal computer.

18. The system of claim 10, wherein the associated station is a personal data assistant.

19. A computer program product having a computer readable medium having computer program logic recorded thereon for performing a computer implemented method for an access point having a basic service set comprising a plurality of associated stations in a plurality of operative modes to provide immediate delivery of low-latency data packets to at least one of a plurality of virtual local area networks, the steps comprising:

monitoring, at the access point, all virtual local area networks comprising at least one station associated with the access point;

determining, for each monitored virtual local area network, those networks having all associated stations operating in active mode;

identifying, via the access point, at least one virtual local area network having all associated stations in active mode operation; and

transmitting low-latency multicast/broadcast data packets immediately to the at least one identified virtual local area network;

wherein the basic service set includes at least one associated station operating in power-save mode.

20. The computer implemented method of claim 19, wherein the access point is an 802.11access point.

21. The computer implemented method of claim 19, wherein each station in active mode is in 802.11constantly active operation supporting low-latency data transmission.

22. The computer implemented method of claim 19, further comprising the step of identifying at least one virtual local area network having the at least one associated station operating in power-save mode.

23. The computer implemented method of claim 22, wherein each associated station operating in power-save mode is in 802.11power-save protocol operation.

24. The computer implemented method of claim 23, further comprising the step of buffering the multicast/broadcast data packets for the at least one virtual local area network having the at least one associated station in power-save protocol operation.

25. The computer implemented method of claim 24, further comprising the step of transmitting the buffered multicast/broadcast data packets with a data traffic indicator mark.

26. The computer implemented method of claim 19, wherein the associated station is a portable personal computer.

27. The computer implemented method of claim 19, wherein the associated station is a personal data assistant.