Communication device having function for searching access point of wireless local area network and method thereof

• US 7,751,828 B2
• Filed: 12/27/2002
• Issued: 07/06/2010
• Est. Priority Date: 12/02/2002
• Status: Expired due to Fees

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Kim, Jin-Kyeong, Park, Nam-Hoon, Kim, Dae-Sik
• Primary Examiner(s): Harper; Vincent P
• Assistant Examiner(s): LAM, DUNG LE
• Application Number:
  US10/537,144
• Publication Number:
  US 20060148486A1
• Time in Patent Office: 2,748 Days
• Field of Search: 455/434, 455/432.1, 455/435.1, 4554561-4566
• US Class Current: 455/456.1
• CPC Class Codes: G01S 5/0009 Transmission of position information to remote stations involving assistance data G01S5/0236
• CPC Class Codes: H04W 36/32 by location or mobility data, e.g. speed data
• CPC Class Codes: H04W 4/02 Services making use of location information
• CPC Class Codes: H04W 48/18 Selecting a network or a communication service
• CPC Class Codes: H04W 52/0219 where the power saving management affects multiple terminals
• CPC Class Codes: H04W 60/04 using triggered events
• 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

The present invention relates to a communication device that automatically searches for wireless local area network (WLAN) access points, and to a method thereof. The communication device includes a GPS receiving module (12) for receiving position information of the connection device from a GPS satellite; a WLAN module (11) for connecting with the WLAN access point; a storage unit (13) for storing position information of the WLAN access point; and a controller (14) for selectively operating the WLAN module based on the position information of the communication device output from the GPS receiving module (12) and the position information of the WLAN access point stored in the storage unit (13). According to the present invention, a user terminal receiving data services through WLAN efficiently utilizes power. Also, the searching of the WLAN access points is performed automatically without the need for user manipulation.

Claims

1. A communication device that connects with a network through a wireless local area network (WLAN) access point to receive data, the communication device comprising:

a GPS receiving module for receiving position information of the connection device from a GPS satellite;

a WLAN module for connecting with the WLAN access point;

a storage unit for storing position information of the WLAN access point; and

a controller for selectively operating the WLAN module based on the position information of the communication device output from the GPS receiving module and the position information of the WLAN access point stored in the storage unit,

wherein the controller receives new WLAN access point position information after receiving a “

Position Information Renewal”

message from a position information server according to checking result of version information on the WLAN access point position information, and renews the stored position information, and

where in the controller receives a “

New Position Information Verification”

message from the position information server of the “

Position Information Renewal”

message or a “

No New information”

message,

receiving a new position information of the WLAN access point from the position information server in the case where the communication device receives the “

Position Information Renewal”

message, and performing processes to renew the position information; and

the position information server checking version information of WLAN access point position information that the communication device has from the “

New Position Information Verification”

message,

transmitting the “

Position Information Renewal”

message to the communication device in the case where a first version of the WLAN access point position information that the communication device has is older than a second version of present WLAN access point position information;

transmitting the “

No New Information”

message to the communication device if the first version is identical to the second version; and

transmitting the new WLAN access point position information corresponding to the second version to the communication device after the “

Position Information Renewal”

message is sent.

2. The communication device of claim 1, wherein the position information of the WLAN access point includes a position of the WLAN access point and the service radius of the WLAN access point.

3. The communication device of claim 2, wherein the controller operates the WLAN module when the communication device is within the service radius of the WLAN access point.

4. The communication device of claim 2, wherein the WLAN module is operated by control of the controller to detect a beacon signal output by the WLAN access point.

5. The communication device of claim 1, wherein the communication device is connected to the position information server, which is connected to the Network through the WLAN access point, and receives WLAN access point position information through the position information server to renew the position information stored in the storage unit.

6. A method for connecting to a wireless local area network (WLAN) access point, which is connected to a network, for a communication device that includes a WLAN module and a GPS receiving module, the method comprising:

a) continuously checking a present position of the communication device through the GPS receiving module;

b) determining an operating point of the WLAN module based on stored position information of the WLAN access point and the position information of the communication device;

c) driving the WLAN module to detect a beacon signal periodically transmitted by the WLAN access point, and connecting to the WLAN access point with the detected beacon signal; and

d) receiving new position information of the WLAN access point from a position information server that is connected to the network following connection to the WLAN access point, and renewing the stored position information,

wherein the communication device receives the new WLAN access point position information after receiving a “

Position Information Renewal”

message according to checking result of version information on the WLAN access point position information by the position information server,

transmitting the “

New Position Information Verification”

message to the position information server through the WLAN module;

receiving from the position information server a reply to the above message, that is, the “

Position Information Renewal”

message or a “

No New Information”

message; and

receiving the new position information of the WLAN access point from the position information server in the case where the communication device receives the “

Position Information Renewal”

message, and performing processes to renew the position information,

checking version information of WLAN access point position information that the communication device has from the “

New Position Information Verification”

message;

transmitting the “

Position Information Renewal”

message to the communication device in the case where a first version of the WLAN access point position information that the communication device has is older than a second version of present WLAN access point position information;

transmitting the “

No New Information”

message to the communication device if the first version is identical to the second version; and

transmitting the new WLAN access point position information corresponding to the second version to the communication device after the “

Position Information Renewal”

message is sent.

7. The method of claim 6, wherein the WLAN access point position information includes access point position information and access point service radius information.