Adjustment of background scanning interval based on network usage

• US 7,792,526 B2
• Filed: 05/15/2006
• Issued: 09/07/2010
• Est. Priority Date: 05/15/2006
• Status: Expired due to Fees

• Current Assignee: Blackberry Limited
• Original Assignee: Blackberry Limited
• Inventors: Salomone, Leonardo
• Primary Examiner(s): Harper; Vincent P
• Assistant Examiner(s): NGUYEN, KHAI MINH
• Application Number:
  US11/383,233
• Publication Number:
  US 20070263558A1
• Time in Patent Office: 1,576 Days
• Field of Search: 455/434, 455/436, 455/450, 455/455, 455/464, 455/509, 455/513, 455/515, 455/422.1, 370/318, 370/328, 370/311
• US Class Current: 455/434
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 48/20 Selecting an access point
• CPC Class Codes: H04W 52/0254 detecting a user operation or a tactile contact or a motion of the device
• CPC Class Codes: H04W 52/0258 controlling an operation mode according to history or models of usage information, e.g. activity schedule or time of day
• CPC Class Codes: H04W 52/0261 managing power supply demand, e.g. depending on battery level
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

In a Wireless Local Area Network (WLAN), roaming from one access point to another by a mobile station without interruption to network service may be facilitated by frequently performing background scans to find neighboring access points while the mobile station is associated to the WLAN. Frequent background scanning, however, depletes battery life. By dynamically adjusting the background scanning interval during the mobile station'"'"'s association to the WLAN, the mobile station'"'"'s immediate need for network connectivity performance may be met, while simultaneously prolonging battery life. For example, by using a shorter background scanning interval during a telephone conversation, network connectivity performance may be maintained throughout the call. Longer background scanning intervals may be used during periods when interruptions to network connectivity may be better tolerated.

Claims

1. A method for power management in a mobile station in a wireless local area network, the method comprising:

determining at different points in time different wireless network usage modes for the mobile station;

determining at each of the different points in time a background scanning interval for the mobile station corresponding to the wireless network usage mode determined at that point in time; and

ensuring that following each of the different points in time, any background scanning to check for neighboring access points is performed periodically at the corresponding background scanning interval until a different background scanning interval has been determined,

wherein a background scanning interval corresponding to a wireless network usage mode for which roaming performance is considered more important than battery conservation is shorter than a background scanning interval corresponding to a wireless network usage mode for which roaming performance is considered less important than battery conservation.

2. The method of claim 1, wherein determining the different wireless network usage modes comprises:

monitoring a user'"'"'s activities at the application level.

3. The method of claim 1, wherein determining the different wireless network usage modes comprises:

monitoring the mobile station'"'"'s network traffic.

4. The method of claim 1, wherein the different wireless network usage modes includes at least two of the following network usage modes:

a mode in which the mobile station is not connected to the network;

a mode in which the only network activity of the mobile station is that which is required to maintain a connection to the network;

a mode in which the mobile station is connected to the network and one or more applications that do not require a network connection are active;

a mode in which the mobile station is connected to the network and there is user interface activity at the mobile station that does not require network resources;

a mode in which the mobile station is connected to the network and an email application of the mobile station is active;

a mode in which the mobile station is connected to the network and email is being sent by or received at the mobile station via the network;

a mode in which the mobile station is connected to the network and an instant messaging application of the mobile station is active;

a mode in which the mobile station is connected to the network and a network browsing application of the mobile station is active;

a mode in which the mobile station is connected to the network and a media streaming application of the mobile station is active;

a mode in which the mobile station is connected to the network and a media streaming session is in progress using a media streaming application of the mobile station; and

a mode in which the mobile station is connected to the network and a telephone application of the mobile station is active and a call is established via the network.

5. The method of claim 1, wherein the different wireless network usage modes includes at least two of the following network usage modes:

a mode in which the mobile station is not connected to the network;

a mode in which the mobile station is connected to the network with sporadic, intermittent network activity;

a mode in which the mobile station is connected to the network with network activity characteristic of email transmission and reception;

a mode in which the mobile station is connected to the network with network activity characteristic of instant messaging;

a mode in which the mobile station is connected to the network with network activity characteristic of browsing;

a mode in which the mobile station is connected to the network with network activity characteristic of media streaming; and

a mode in which the mobile station is connected to the network with network activity characteristic of telephone communications.

6. A Non-transitory computer-readable medium having computer-executable instructions thereon which, when executed by a processor of a mobile station, result in:

determining at different points in time different wireless network usage modes for the mobile station;

determining at each of the different points in time a background scanning interval for the mobile station corresponding to the wireless network usage mode determined at that point in time; and

ensuring that following each of the different points in time, any background scanning to check for neighboring access points is performed periodically at the background scanning interval until a different background scanning interval has been determined,

wherein a background scanning interval corresponding to a wireless network usage mode for which roaming performance is considered more important than battery conservation is shorter than a background scanning interval corresponding to a wireless network usage mode for which roaming performance is considered less important than battery conservation.

7. A mobile station comprising:

an antenna;

a radio coupled to the antenna through which the mobile station is able to communicate over a wireless local area network;

a wireless local area network controller coupled to the radio, which is able to control a background scanning process while the mobile station is associated to the network, the background scanning process occurring periodically according to an adjustable background scanning interval;

a processor coupled to the wireless local area network controller; and

a memory to store code which, when executed by the processor, is to determine at different points in time different wireless network usage modes for the mobile station, to determine at each of the different points in time a background scanning interval for the mobile station corresponding to the wireless network usage mode determined at that point in time, and to ensure that following each of the different points in time, any background scanning to check for neighboring access points is performed periodically at the corresponding background scanning interval until a different background scanning interval has been determined,

wherein a background scanning interval corresponding to a wireless network usage mode for which roaming performance is considered more important than battery conservation is shorter than a background scanning interval corresponding to a wireless network usage mode for which roaming performance is considered less important than battery conservation.

8. The mobile station of claim 7, further comprising:

means for monitoring the mobile station'"'"'s network traffic.

9. The mobile station of claim 7, wherein the different wireless network usage modes includes at least two of the following network usage modes:

a mode in which the mobile station is not connected to the network;

a mode in which the only network activity of the mobile station is that which is required to maintain a connection to the network;

a mode in which the mobile station is connected to the network and one or more applications that do not require a network connection are active;

a mode in which the mobile station is connected to the network and there is user interface activity at the mobile station that does not require network resources;

a mode in which the mobile station is connected to the network and an email application of the mobile station is active;

a mode in which the mobile station is connected to the network and email is being sent by or received at the mobile station via the network;

a mode in which the mobile station is connected to the network and an instant messaging application of the mobile station is active;

a mode in which the mobile station is connected to the network and a network browsing application of the mobile station is active;

a mode in which the mobile station is connected to the network and a media streaming application of the mobile station is active;

a mode in which the mobile station is connected to the network and a media streaming session is in progress using a media streaming application of the mobile station; and

a mode in which the mobile station is connected to the network and a telephone application of the mobile station is active and a call is established via the network.

10. The mobile station of claim 7, wherein the different wireless network usage modes includes at least two of the following network usage modes:

a mode in which the mobile station is not connected to the network;

a mode in which the mobile station is connected to the network with sporadic, intermittent network activity;

a mode in which the mobile station is connected to the network with network activity characteristic of email transmission and reception;

a mode in which the mobile station is connected to the network with network activity characteristic of instant messaging;

a mode in which the mobile station is connected to the network with network activity characteristic of browsing; and

a mode in which the mobile station is connected to the network with network activity characteristic of telephone communications and/or media streaming.