Delegated network connection management and power management in a wireless device

• US 20090022068A1
• Filed: 07/11/2008
• Published: 01/22/2009
• Est. Priority Date: 07/16/2007
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Iyer, Mahesh D., Rao, Venkat B.
• Granted Patent: US 8,305,958 B2
• Time in Patent Office: Days
• US Class Current: 370/254
• CPC Class Codes: H04L 41/0806 for initial configuration or provisioning, e.g. plug-and-play
• CPC Class Codes: H04L 41/0816 the condition being an adaptation, e.g. in response to network events
• CPC Class Codes: H04L 41/0833 for reduction of network energy consumption
• CPC Class Codes: H04L 41/12 Discovery or management of network topologies
• CPC Class Codes: H04L 41/5003 Managing SLA; Interaction between SLA and QoS
• CPC Class Codes: H04L 43/0811 by checking connectivity
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 52/0219 where the power saving management affects multiple terminals
• CPC Class Codes: H04W 52/0245 according to signal strength
• CPC Class Codes: Y02D 30/00 Reducing energy consumption in communication networks
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method and system for advanced media access control delegated from a host device, such as a WiFi device, to a smart wireless communications module. In an embodiment, the host signals to the wireless module a list of one or more preferred networks. The wireless module offloads from the host the processing required to scan for the preferred network(s), as well as possibly other management tasks. The wireless communications module may automatically reassign the network connection from an existing network to a preferred network, or may report to the host when a preferred network is discovered. In either case, the wireless communications module may monitor the wireless environment, and scan for preferred networks, in parallel with maintaining an existing connection. The method and system allows rapid adaptation to a changing network environment, and enables lower system power consumption by distributing management functions between the host and the lower-powered wireless communications module.

Claims

1. In a communications system comprising a host and a wireless communications module coupled to said host, a method for network discovery and connection management comprising:

delegating from a processor of said host a communications task, wherein said communications task comprises at least one of;

a task to automate an establishment of a network connection;

a task to optimize a network connection; and

a task to report on a network environment;

receiving at said wireless communications module said communications task; and

performing at said wireless communications module said communications task.

2. The method of claim 1, wherein said task further comprises:

a list comprising;

a plurality of alternative networks; and

a criteria for prioritizing said networks;

a second task to search said network environment for at least an available network of said plurality of networks; and

a third task to establish said network connection with a highest priority network of said at least an available network, wherein said highest priority network of said at least an available network is a preferred network.

3. The method of claim 2, further comprising:

receiving said task at said wireless communications module;

searching said network environment via said wireless communications module for said preferred network; and

establishing via said wireless communications module said connection with said preferred network.

4. The method of claim 1, further comprising performing said communications task at said wireless communications module in parallel with maintaining an existing network connection via said wireless communications module.

5. The method of claim 4, further comprising:

defining in said communications task a preferred network connection; and

monitoring said network environment for said preferred network connection while maintaining said existing network connection.

6. The method of claim 5, further comprising switching said network connection to said preferred network upon a detection of said preferred network.

7. The method of claim 1, further comprising delegating from the processor of said host a communications task of determining at least one of a communications event or a communications status.

8. The method of claim 7, wherein said at least one of said communications status or said communications event comprises at least one of:

an existing network connection is found;

said existing network is not found

a preferred network is found;

said preferred network is not found;

a data packet is found;

said data packet is not found;

a management packet is found;

or

said management packet is not found.

9. The method of claim 7, further comprising signaling the host with the at least one of the communications status or the communications event.

10. The method of claim 1, further comprising periodically performing said communications task.

11. The method of claim 10, further comprising adjusting a timing between repetitions of said periodic communications task.

12. The method of claim 11, further comprising adjusting said timing in conformance with a detected condition of said network environment.

13. The method of claim 12, further comprising adjusting said timing in conformance with a detection that a current network connection is not found and a preferred network connection is not found.

14. The method of claim 1, further comprising:

defining in said communications task a specified network condition; and

notifying said host module when said specified condition is detected by said wireless communications module.

15. The method of claim 1, further comprising:

defining in said communications task a specified network condition and a specified response; and

automatically performing said specified response by said wireless communications module when said specified network condition is detected by said wireless communications module.

16. The method of claim 1, further comprising configuring said wireless communications module to store a data pertaining to a detected condition of said network environment.

17. The method of claim 1, further comprising:

defining in said communications task a network condition filter criteria; and

reporting from said wireless communications module to said host a detected network condition which conforms to said filter criteria.

18. The method of claim 1, further comprising:

configuring said wireless communications module to recognize a network condition not requiring support from said host; and

in response to said network condition sending a power-consumption reduction command from said wireless communications module to at least one of said host, a processor of said host, a bus of said host, and a radio chip associated with said host.

19. A system for media access control, said system receiving a delegated communications task from a host device, comprising:

a media access control (MAC) device constructed and arranged to receive said delegated communications task;

said MAC device further constructed and arranged to manage a process of network discovery and network connection management according to said delegated communications task, said delegated communications task comprising at least one of;

a task to automate an establishment of a network connection;

a task to optimize a network connection; and

a task to report on a network environment.

20. The system of claim 19, wherein said MAC device comprises a processor and a memory in communication with said processor, said memory storing a plurality of processing instructions for directing the processor to manage the network environment according to said delegated communications task.

21. The system of claim 19, wherein said MAC device is constructed and arranged to consume less power to perform said communications task than a power required by a processor of said host device to perform said communications task.

22. The system of claim 19, wherein said MAC device is further constructed and arranged to perform said delegated communications task in parallel with maintaining an existing network connection.

23. The system of claim 19, wherein said MAC device is further constructed and arranged to periodically perform said communications task.

24. The system of claim 19, wherein said MAC device is further constructed and arranged to adjust a timing between repetitions of said periodic communications task in conformance with a detected condition of said network environment.

25. The system of claim 19, wherein:

said host device comprises at least one of a processor, a radio chip, and a bus; and

said MAC device is configured and arranged that upon a determination of a lack of network connectivity said MAC device issues a sleep command to at least one of said processor, said radio chip, or said bus.

26. A system for media access control, comprising:

a host module constructed and arranged to delegate a communications task; and

a media access control (MAC) device coupled to said host module;

said MAC device constructed and arranged to receive said delegated communications task;

said MAC device further constructed and arranged to manage a process of network discovery and network connection management according to said delegated communications task;

wherein said host module switches to a low power mode after offloading said delegated communications task to said MAC device.

27. The system of claim 26, wherein said host module comprises a first processor, wherein said MAC device is constructed and arranged to consume less power to perform said communications task compared to a power required by said first processor to perform said communications task.

28. In a communications system comprising a host and a wireless communications module coupled to said host, a method for network discovery and connection management comprising:

delegating from a processor of said host a communications task, wherein said communications task comprises at least one of;

a task to automate an establishment of a connection to a preferred network;

a task to detect a preferred network; and

a task to automatically switch a network connection to a preferred network;

receiving at said wireless communications module said communications task; and

performing at said wireless communications module said communications task.

29. In a communications system comprising a host and a wireless communications module coupled to said host, a method for network discovery and connection management comprising:

delegating from a processor of said host a communications task;

receiving at said wireless communications module said communications task; and

performing at said wireless communications module said communications task.

30. The method of claim 29, wherein the step of delegating the communications task from the processor of the host communications module comprises at least one of:

delegating a task to automate an establishment of a network connection;

delegating a task to optimize a network connection; and

delegating a task to report on a network environment.

31. The method of claim 29, wherein the step of delegating the communications task from the processor of the host communications module comprises at least one of:

delegating a task to automate an establishment of a connection to a preferred network;

delegating a task to detect a preferred network; and

delegating a task to automatically switch a network connection to a preferred network.

32. A system for media access control, said system receiving a delegated communications task from a host device, comprising:

a media access control (MAC) device constructed and arranged to receive said delegated communications task;

said MAC device further constructed and arranged to manage a process of network discovery and network connection management according to said delegated communications task.