SCANNING FOR NETWORK CONNECTIONS WITH VARIABLE SCAN RATE

• US 20090252137A1
• Filed: 06/18/2009
• Published: 10/08/2009
• Est. Priority Date: 02/09/2006
• Status: Active Grant

• Current Assignee: Sony Semiconductor Solutions Corporation (Sony Group Corp.)
• Original Assignee: Altair Semiconductor Ltd. (Sony Group Corp.)
• Inventors: Bitran, Yigal, Solomon, Eitan
• Granted Patent: US 7,822,436 B2
• Time in Patent Office: Days
• US Class Current: 370/338
• CPC Class Codes: H04M 2250/10 including a GPS signal receiver
• CPC Class Codes: H04M 2250/12 including a sensor for measuring a physical value, e.g. temperature or motion telephones including GPS signal receivers H04M2250/10
• CPC Class Codes: H04W 48/04 based on user or terminal location or mobility data, e.g. moving direction, speed
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: H04W 52/0254 detecting a user operation or a tactile contact or a motion of the device
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A wireless communication terminal includes a radio frequency (RF) transceiver and a baseband processing circuit, which is arranged to detect an indication of a rate of movement of the terminal. The baseband processing circuit is coupled to cause the RF transceiver to scan periodically for access points that are available to communicate with the mobile terminal at a scan rate that is selected responsively to the indication, and upon detecting an available access point, to establish a wireless connection between the terminal and the available access point.

Claims

1. A wireless communication terminal, comprising:

a radio frequency (RF) transceiver; and

a baseband processing circuit, which is arranged to detect an indication of a rate of movement of the terminal, and is coupled to cause the RF transceiver to scan periodically for access points that are available to communicate with the wireless communication terminal at a variable scan rate that is selected from among a plurality of different scan rates responsively to the indication, and upon detecting an available access point, to establish a wireless connection between the terminal and the available access point.

2. The terminal according to claim 1, wherein the indication comprises a change in a geographical position of the mobile terminal.

3. The terminal according to claim 1, wherein the baseband processing circuit is arranged to cause the RF transceiver to exchange data over the air with a base station over a long-range wireless network while scanning periodically for the access points.

4. The terminal according to claim 3, wherein the baseband processing circuit is arranged to assess the rate of movement responsively to a change in signals received by the terminal from the base station over the long-range wireless network.

5. The terminal according to claim 3, wherein the long-range wireless network comprises a WiMAX network, and wherein the wireless connection with the available access point is established over a wireless local area network (WLAN).

6. The terminal according to claim 1, wherein the baseband processing circuit is arranged to scan for the access points at a first scan rate when the terminal is moving at a pedestrian speed, and to scan at a second scan rate, lower than the first scan rate, when the terminal is stationary.

7. The terminal according to claim 1, wherein the baseband processing circuit is arranged to stop the scanning when the rate of movement is indicated to be above a predetermined maximum.

17. The method according to claim 5, wherein the long-range wireless network comprises a WiMAX network, and wherein establishing the wireless connection comprises connecting the mobile terminal with the available access point over a wireless local area network (WLAN).

8-12. -12. (canceled)

13. A method for communication, comprising:

detecting an indication of a rate of movement of a mobile terminal;

scanning periodically for access points that are available to communicate with the mobile terminal, at a variable scan rate that is selected from among a plurality of different scan rates responsively to the indication; and

upon detecting an available access point, establishing a wireless connection between the mobile terminal and the available access point.

14. The method according to claim 13, wherein detecting the indication comprises detecting a change in a geographical position of the mobile terminal.

15. The method according to claim 13, and comprising exchanging data over the air between the mobile terminal and a base station over a long-range wireless network while scanning periodically for the access points.

16. The method according to claim 15, wherein exchanging the data comprises receiving at the mobile terminal signals transmitted by the base station, and wherein detecting the indication comprises assessing the rate of movement responsively to a change in the signals.

18. The method according to claim 13, wherein scanning periodically comprises scanning at a first scan rate when the mobile terminal is moving at a pedestrian speed, and scanning at a second scan rate, lower than the first scan rate, when the mobile terminal is stationary.

19. The method according to claim 13, wherein scanning periodically comprises stopping the scanning when the rate of movement is indicated to be above a predetermined maximum.

20-24. -24. (canceled)