Method and system for conserving battery power in wireless devices operating in a wireless local area network

• US 20070192437A1
• Filed: 02/10/2006
• Published: 08/16/2007
• Est. Priority Date: 02/10/2006
• Status: Active Grant

• Current Assignee: Malikie Innovations Limited (Key Patent Innovations Limited)
• Original Assignee: Blackberry Limited
• Inventors: Wang, James, Rawlins, Rudy
• Granted Patent: US 8,433,820 B2
• Time in Patent Office: Days
• US Class Current: 709/219
• CPC Class Codes: H04L 12/12 Arrangements for remote connection or disconnection of substations or of equipment thereof
• CPC Class Codes: H04L 61/10 of different types
• CPC Class Codes: H04L 61/103 across network layers, e.g. resolution of network layer into physical layer addresses or address resolution protocol [ARP]
• CPC Class Codes: H04L 61/5014 using dynamic host configuration protocol [DHCP] or bootstrap protocol [BOOTP]
• CPC Class Codes: H04L 61/58 Caching of addresses or names
• CPC Class Codes: H04L 61/59 using proxies for addressing
• CPC Class Codes: H04W 4/18 Information format or content conversion, e.g. adaptation by the network of the transmitted or received information for the purpose of wireless delivery to users or terminals
• CPC Class Codes: H04W 48/10 using broadcasted information
• CPC Class Codes: H04W 52/0212 managed by the network, e.g. network or access point is master and terminal is slave
• CPC Class Codes: H04W 80/00 Wireless network protocols or protocol adaptations to wireless operation
• 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 conserving battery power in a wireless device coupled through an access point to a server in a network, the server being coupled to at least one client in the network, each of the wireless device, the at least one client, and the access point having a respective hardware address, the method comprising: receiving at the server through the access point a message indicative of the wireless device joining the network and providing the hardware address of the wireless device; updating a list of hardware addresses for clients in the network to include the hardware address of the wireless device, the list including a respective Internet Protocol (“IP”) address for each hardware address; and, sending from the server to at least one of the wireless device, the at least one client, and the access point, the updated list of hardware addresses to thereby reduce a number of request messages broadcast on the network for information that is contained in the updated list that the wireless device need leave a sleep mode to process.

Claims

1. A method for conserving battery power in a wireless device coupled through an access point to a server in a network, the server being coupled to at least one client in the network, each of the wireless device, the at least one client, and the access point having a respective hardware address, the method comprising:

receiving at the server through the access point a message indicative of the wireless device joining the network and providing the hardware address of the wireless device;

updating a list of hardware addresses for clients in the network to include the hardware address of the wireless device, the list including a respective Internet Protocol (“

IP”

) address for each hardware address; and

,

sending from the server to at least one of the wireless device, the at least one client, and the access point, the updated list of hardware addresses to thereby reduce a number of request messages broadcast on the network for information that is contained in the updated list that the wireless device need leave a sleep mode to process.

2. The method of claim 1 and further comprising assigning an IP address to the wireless device.

3. The method of claim 1 wherein each hardware address is a Media Access Control (“

MAC”

) address.

4. The method of claim 1 wherein the list is an Address Resolution Protocol (“

ARP”

) cache and each request message is an ARP request message.

5. The method of claim 1 wherein the server is a Dynamic Host Configuration Protocol (“

DHCP”

) server.

6. The method of claim 1 wherein the wireless device is coupled to the access point through a wireless local area network (“

WLAN”

).

7. The method of claim 6 wherein the network is a local area network (“

LAN”

).

8. The method of claim 7 wherein the WLAN is a subnetwork of the network.

9. The method of claim 8 wherein the access point includes a gateway to the subnetwork.

10. The method of claim 9 wherein the server includes the access point.

11. The method of claim 1 and further comprising the server periodically updating the list by sending a unicast request for information message to one of the wireless device, the at least one client, and the access point.

12. The method of claim 1 wherein the access point replaces the request messages broadcast on the network with a unicast request for information sent to one of the wireless device and the at least one client.

13. The method of claim 1 and further comprising receiving at the server from the wireless device a request for the updated list.

14. The method of claim 1 wherein the list is updated by the access point.

15. A system for conserving battery power in a wireless device coupled through an access point in a network to the system, the system being coupled to at least one client in the network, each of the wireless device, the at least one client, and the access point having a respective hardware address, the system comprising:

a processor coupled to the network; and

,

a program executed by the processor, the program including;

a module for receiving through the access point a message indicative of the wireless device joining the network and providing the hardware address of the wireless device;

a module for updating a list of hardware addresses for clients in the network to include the hardware address of the wireless device, the list including a respective Internet Protocol (“

IP”

) address for each hardware address; and

,

a module for sending to at least one of the wireless device, the at least one client, and the access point, the updated list of hardware addresses to thereby reduce a number of request messages broadcast on the network for information that is contained in the updated list that the wireless device need leave a sleep mode to process.

16. The system of claim 15 and further comprising a module for assigning an IP address to the wireless device.

17. The system of claim 15 wherein each hardware address is a Media Access Control (“

MAC”

) address.

18. The system of claim 15 wherein the list is an Address Resolution Protocol (“

ARP”

) cache and each request message is an ARP request message.

19. The system of claim 15 wherein the system is a Dynamic Host Configuration Protocol (“

DHCP”

) server.

20. The system of claim 15 wherein the wireless device is coupled to the access point through a wireless local area network (“

WLAN”

).

21. The system of claim 20 wherein the network is a local area network (“

LAN”

).

22. The system of claim 21 wherein the WLAN is a subnetwork of the network.

23. The system of claim 22 wherein the access point includes a gateway to the subnetwork.

24. The system of claim 23 wherein the system includes the access point.

25. The system of claim 15 and further comprising a module for periodically updating the list by sending a unicast request for information message to one of the wireless device, the at least one client, and the access point.

26. The system of claim 15 wherein the access point replaces the request messages broadcast on the network with a unicast request for information sent to one of the wireless device and the at least one client.

27. The system of claim 15 and further comprising a module for receiving from the wireless device a request for the updated list.

28. The system of claim 15 wherein the list is updated by the access point.

29. A computer program product having computer executable code for directing a system to conserve battery power in a wireless device coupled through an access point in a network to the system, the system being coupled to at least one client in the network, each of the wireless device, the at least one client, and the access point having a respective hardware address, the code comprising:

code for receiving at the system through the access point a message indicative of the wireless device joining the network and providing the hardware address of the wireless device;

code for updating a list of hardware addresses for clients in the network to include the hardware address of the wireless device, the list including a respective Internet Protocol (“

IP”

) address for each hardware address; and

,

code for sending from the system to at least one of the wireless device, the at least one client, and the access point, the updated list of hardware addresses to thereby reduce a number of request messages broadcast on the network for information that is contained in the updated list that the wireless device need leave a sleep mode to process.

30. The computer program product of claim 29 and further comprising code for assigning an IP address to the wireless device.

31. The computer program product of claim 29 wherein each hardware address is a Media Access Control (“

MAC”

) address.

32. The computer program product of claim 29 wherein the list is an Address Resolution Protocol (“

ARP”

) cache and each request message is an ARP request message.

33. The computer program product of claim 29 wherein the system is a Dynamic Host Configuration Protocol (“

DHCP”

) server.

34. The computer program product of claim 29 wherein the wireless device is coupled to the access point through a wireless local area network (“

WLAN”

).

35. The computer program product of claim 34 wherein the network is a local area network (“

LAN”

).

36. The computer program product of claim 35 wherein the WLAN is a subnetwork of the network.

37. The computer program product of claim 36 wherein the access point includes a gateway to the subnetwork.

38. The computer program product of claim 37 wherein the system includes the access point.

39. The computer program product of claim 29 and further comprising code for the system periodically updating the list by sending a unicast request for information message to one of the wireless device, the at least one client, and the access point.

40. The computer program product of claim 29 wherein the access point replaces the request messages broadcast on the network with a unicast request for information sent to one of the wireless device and the at least one client.

41. The computer program product of claim 29 and further comprising code for receiving at the server from the wireless device a request for the updated list.

42. The computer program product of claim 29 wherein the list is updated by the access point.