APPARATUS AND METHOD FOR SEARCHING FOR WLAN IN PORTABLE TERMINAL

• US 20080137626A1
• Filed: 12/03/2007
• Published: 06/12/2008
• Est. Priority Date: 12/01/2006
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: CHOI, Chi-Won, Son, Chang-Ho
• Granted Patent: US 8,059,601 B2
• Time in Patent Office: Days
• US Class Current: 370/338
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 48/18 Selecting a network or a communication service
• CPC Class Codes: H04W 8/183 Processing at user equipment or user record carrier
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Provided is an apparatus and method for searching for a WLAN in a portable terminal. The method includes, upon registering a WLAN, mapping and storing cell information on a present position and information on the registered WLAN; comparing the stored cell information with connected cell information when entering a mode concurrently supporting a cellular network and a WLAN in a state where a connection to the cellular network is made; and searching for a WLAN using the WLAN information mapped to the stored cell information, when the stored cell information is consistent with the connected cell information.

Claims

1. A method for searching for a Wireless Local Area Network (WLAN) in a portable terminal, the method comprising:

upon registering a WLAN, mapping and storing cell information on a present position and information on the registered WLAN;

when entering a mode concurrently supporting a cellular network and a WLAN in a state where a connection to the cellular network is made, comparing the stored cell information with connected cell information; and

searching for a WLAN using the WLAN information mapped to the stored cell information, when the stored cell information is consistent with the connected cell information.

2. The method of claim 1, further comprising:

when the stored cell information is not consistent with the connected cell information, checking whether a connected cell of the terminal is changed; and

upon determining that the connected cell has changed, comparing whether the stored cell information is consistent with information on the changed cell.

3. The method of claim 1, further comprising:

when the stored cell information is not consistent with the connected cell information, informing a user of a state of the mobile terminal where a connection to a previously registered WLAN is disabled.

4. The method of claim 1, wherein the cell information comprises at least one of a Public Land Mobile Network IDentity (PLMNID), a Location Area Identity (LAI), a Routing Area Identity (RAI), a Primary Scrambling Code (PSC) of an in-connection cell, and a PSC of a neighbor cell.

5. The method of claim 1, wherein the WLAN information comprises at least one of a Service Set IDentity (SSID) and a Basic Service Set IDentity (BSSID).

6. An apparatus for searching for a WLAN in a portable terminal, the apparatus comprising:

a network information acquirement unit for acquiring cell information from a base station of a connected cell and acquiring WLAN information from an Access Point (AP) of a WLAN;

a network information storage unit for, when a specific WLAN is registered, mapping and storing cell information on an area where the terminal is positioned and information on the specific WLAN; and

a WLAN search decider for when entering a mode concurrently supporting a cellular network and a WLAN in a state where a connection to the cellular network is made, comparing the stored cell information with information on the connected cell and deciding whether to search for a WLAN.

7. The apparatus of claim 6, wherein when the stored cell information is consistent with the connected cell information, the WLAN search decider decides to search for a WLAN corresponding to the WLAN information mapped to the stored cell information, when the stored cell information is consistent with the connected cell information.

8. The apparatus of claim 6, wherein upon determining that the stored cell information is not consistent with the connected cell information, the WLAN search decider checks whether the connected cell of the terminal is changed and, upon determining that the connected cell of the terminal has changed, again decides whether to search the WLAN.

9. The apparatus of claim 6, further comprising:

a display unit for when the WLAN search decider determines that the stored cell information is not consistent with the connected cell information, informing a user of a state where a connection to a previously registered WLAN is disabled.

10. The apparatus of claim 6, wherein the cell information comprises at least one of a PLMNID, an LAI, an RAI, a PSC of a connected cell, and a PSC of a neighbor cell.

11. The apparatus of claim 6, wherein the WLAN information comprises at least one of an SSID and a BSSID.

12. A portable terminal for searching for a WLAN, wherein the terminal comprises:

a network information acquirement unit for acquiring cell information from a base station of a connected cell and acquiring WLAN information from an Access Point (AP) of a WLAN;

a network information storage unit for, when a specific WLAN is registered, mapping and storing cell information on an area where the terminal is positioned and information on the specific WLAN; and

a WLAN search decider for comparing the stored cell information with information on a connected cell and deciding whether to search for a WLAN, when entering a mode concurrently supporting a cellular network and a WLAN in a state where a connection to the cellular network is made.

13. The portable terminal of claim 12, wherein the WLAN search decider decides to search for a WLAN corresponding to WLAN information mapped to the stored cell information, when the stored cell information is consistent with the connected cell information.

14. The portable terminal of claim 12, wherein the WLAN search decider checks whether the connected cell of the terminal is changed and, upon checking so, again decides whether to search the WLAN, when checking that the stored cell information is not consistent with the connected cell information.

15. The portable terminal of claim 12, further comprising a display unit for informing a state where a connection to a previously registered WLAN is disabled when the WLAN search decider determines that the stored cell information is not consistent with the connected cell information.

16. The portable terminal of claim 12, wherein the cell information comprises at least one of a PLMNID, an LAI, an RAI, a PSC of an in-connection cell, and a PSC of a neighbor cell.

17. The portable terminal of claim 12, wherein the WLAN information comprises at least one of an SSID and a BSSID.

18. A method for searching for a Wireless Local Area Network (WLAN) in a portable terminal, the method comprising:

mapping and storing cell information on a present position and information on a registered WLAN;

comparing the stored cell information with connected cell information of a connection to a cellular network is made; and

searching for a WLAN using the WLAN information mapped to the stored cell information, when the stored cell information is consistent with the connected cell information.

19. A computer-readable recording medium having recorded thereon a program for searching for a Wireless Local Area Network (WLAN) in a portable terminal, comprising:

a first code segment, for mapping and storing cell information on a present position and information on a registered WLAN;

a second code segment, for comparing the stored cell information with connected cell information of a connection to a cellular network is made; and

a third code segment, for searching for a WLAN using the WLAN information mapped to the stored cell information, when the stored cell information is consistent with the connected cell information.