Power saving operation of always-connected wireless roaming

• US 8,717,958 B2
• Filed: 12/22/2011
• Issued: 05/06/2014
• Est. Priority Date: 09/28/2007
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Intel Corporation
• Inventors: Sood, Kapil, James, Tsai
• Primary Examiner(s): Sam, Phirin
• Application Number:
  US13/334,648
• Publication Number:
  US 20120272079A1
• Time in Patent Office: 866 Days
• Field of Search: None
• US Class Current: 370/311
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 52/0251 using monitoring of local events, e.g. events related to user activity
• CPC Class Codes: H04W 52/0293 having a sub-controller with a low clock frequency switching on and off a main controller with a high clock frequency
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Methods and apparatuses enable maintaining wireless connectivity while the wireless client device is in a power save mode. The system includes a host operating system (OS) that handles wireless connections while the device is executing in normal operation, and an embedded agent that handles the wireless connections when the device switches to power saving operation and the host OS switches to a sleep or standby state. The system detects a change in the power save mode and triggers an exchange of session context information between the host OS and the embedded agent (from the host OS to the embedded agent when the system enters the power save mode, and from the embedded agent to the host OS when the system returns to normal operation from the power save mode). The system also triggers the switching of management consistent with the passing of session context information.

Claims

1. A method in a wireless network client device comprising:

receiving, by an embedded agent of the wireless network client device from a host operating system (OS) of the wireless network client device, control of session context defining a network access session of the wireless network client device with a wireless network responsive to the host OS transitioning to a power saving operating mode, the embedded agent having independent operation from the host OS, the session context including connectivity and security configuration information including a session management key;

maintaining the network access session including roaming with the embedded agent while the host OS is in the power saving operating mode, including managing the session management key; and

transferring management of roaming for the wireless network client device back to the host OS from the embedded agent responsive to the host OS exiting from the power saving operating mode, including transferring control of the session context to the host OS including the session management key.

2. The method of claim 1, wherein receiving the session context by the embedded agent comprises:

receiving information related to multiple open network connections, including keying information for all active connections.

3. The method of claim 1, wherein the embedded agent comprises one of a virtual machine independent of the host OS or an embedded firmware agent executing on network interface hardware.

4. The method of claim 1, wherein the embedded agent comprises one of an embedded microcontroller on a host hardware platform or a dedicated processing core of a multi-core processing unit.

5. The method of claim 1, wherein receiving control of the session context comprises:

receiving control of session context for roaming that is compatible with the Institute of Electrical and Electronics Engineers (IEEE) 802.11r standard.

6. The method of claim 1, wherein maintaining the network access session comprises:

executing wireless connection management algorithms locally on the embedded agent.

7. The method of claim 1, wherein maintaining the network access session comprises:

maintaining quality of service (QoS) parameters of the wireless connections.

8. An article of manufacture comprising a non-transitory computer readable storage medium having content stored thereon to provide instructions to cause a machine to perform operations including:

receiving, at an embedded agent of a wireless network client device from a host operating system (OS) of the wireless network client device, control of session context related to a network access session of the wireless network client device in response to the host OS transitioning to a power saving operating mode, the embedded agent having independent operation from the host OS, the session context including connectivity and security

configuration information including a session management key;

performing roaming on behalf of the wireless network client device with the embedded agent while the host OS is in the power saving operating mode, including managing the session management key; and

transferring management of roaming for the wireless network client device back to the host OS from the embedded agent responsive to the host OS exiting from the power saving operating mode, including transferring control of the session context to the host OS including the session management key.

9. The article of manufacture of claim 8, wherein the content to provide instructions for receiving the session context by the embedded agent comprises content to provide instructions for

receiving the session context via a wireless device driver to the embedded agent.

10. The article of manufacture of claim 8, wherein the content to provide instructions for receiving the session context by the embedded agent comprises content to provide instructions for

receiving the session context from the host OS by one of a virtual machine independent of the host OS, an embedded firmware agent executing on network interface hardware, an embedded microcontroller on a host hardware platform, or a dedicated processing core of a multi-core processing unit.

11. The article of manufacture of claim 8, wherein the content to provide instructions for performing the roaming comprises content to provide instructions for

executing wireless connection management algorithms locally on the embedded agent.

12. The article of manufacture of claim 8, wherein the content to provide instructions for receiving the session context by the embedded agent comprises content to provide instructions for

receiving information related to multiple open network connections, including keying information for all active connections.

13. The article of manufacture of claim 8, wherein the content to provide instructions for performing roaming further comprises content to provide instructions for

maintaining quality of service (QoS) parameters of the wireless connections.

14. A wireless client device comprising:

a hardware processor to execute an embedded agent to operate independently of a host operating system (OS), the embedded agent to manage the wireless connections in a power saving mode when the host OS is not managing the wireless connections, including maintaining the wireless connections with the wireless access point and roaming to a different wireless access point and managing a session management key;

transfer logic to switch management of the wireless connections between the host OS and the embedded agent depending on the operating mode, and trigger an exchange of session context that defines a network access session of the wireless client device, the session context including connectivity and security configuration information including a session management key

wherein the host OS manages the wireless connections in a normal operating mode, and the embedded agent to transfer management of roaming back to the host OS responsive to the host OS exiting from the power saving mode, including transferring control of the session context to the host OS including the session management key; and

network interface hardware to maintain a physical link to a current access point.

15. The wireless client device of claim 14, wherein the embedded agent comprises an agent executed on one of a processor core, a microprocessor on a hardware platform of the wireless client device, or a network interface card.

16. The wireless client device of claim 14, wherein the embedded agent managing the wireless connections comprises maintaining security parameters of the wireless connections.

17. The wireless client device of claim 14, wherein the embedded agent managing the wireless connections comprises maintaining quality of service (QoS) parameters of the wireless connections.

18. The wireless client device of claim 14, wherein the transfer logic triggers an exchange of multiple session contexts for multiple sessions for the wireless client device.

19. The wireless device of claim 14, wherein the embedded agent managing the wireless connections comprises executing wireless connection management algorithms locally on the embedded agent.

20. The wireless device of claim 14, wherein the embedded agent managing the wireless connection comprises managing session information related to multiple open network connections, including keying information for all active connections.