Apparatus and method for registering wireless terminals with access point through wireless network

• US 20050122921A1
• Filed: 12/03/2004
• Published: 06/09/2005
• Est. Priority Date: 12/04/2003
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Seo, Cheong-Jeong
• Granted Patent: US 7,561,898 B2
• Time in Patent Office: Days
• US Class Current: 370/310
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 60/04 using triggered events
• CPC Class Codes: H04W 8/26 Network addressing or numbering for mobility support
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

In the method and apparatus for registering wireless terminals with an access point (AP) through a wireless network according to the present invention, there is no need for a re-registration procedure for terminals because, when the AP is restarted, the AP informs wireless terminals registered in its service area of the restart of the AP so as to allow each of the terminals to perform its own location registration. In addition, total update is possible, this method being in contrast to methods in which notification of a restart of the AP is carried out in a one-to-one manner using the broadcast data. As a result, efficiency in time and in the overall network is achieved by the invention. The AP can easily restore the address resolution protocol (ARP) table that has been cleared by the restart process because the terminals send the ARP table themselves, thereby providing for stabilized service.

Claims

1. A method for rebuilding a wireless terminal address resolution protocol table of an access point using a wireless network, the method comprising the steps of:

when the access point is restarted, transmitting a restart generation notification message as broadcast data to wireless terminals over the wireless network; and

rebuilding the address resolution protocol table using address resolution protocol registration information transmitted from at least one wireless terminal which receives the restart generation notification message and belongs to a service area of the access point.

2. The method of claim 1, wherein the restart generation notification message includes identifier information and restart information of the access point.

3. The method of claim 2, wherein the identifier information of the access point includes at least one of medium access control address information, Basic Service Set identifier information, and Extended Service Set identifier information of the access point.

4. The method of claim 1, wherein rebuilding the address resolution protocol table includes the steps of:

transmitting a join response signal over the wireless network when a join request signal is received from said at least one wireless terminal;

transmitting a probe response signal to terminals receiving the join response signal over the wireless network when a probe request signal is received from the terminals;

transmitting a medium access control authentication response signal to the terminals receiving the probe response signal when a medium access control authentication signal is received from the terminals; and

when an association request signal is received from the terminals receiving the medium access control confirmation response signal, transmitting an association response signal in response to the association request signal, and then building the address resolution protocol table for said at least one wireless terminal.

5. The method of claim 1, wherein said at least one wireless terminal includes at least one of a voice terminal, a data terminal, and a voice/data terminal capable of performing wireless network communication.

6. The method of claim 1, wherein the restart generation notification message is added to a beacon signal and transmitted, the beacon signal being periodically transmitted to said at least one wireless terminal.

7. The method of claim 1, wherein the wireless network comprises a wireless local area network (WLAN).

8. A method for detecting a restart of an access point using a wireless network, the method comprising the steps of:

receiving a restart generation notification message transmitted as broadcast data from the access point over the wireless network;

comparing medium access control information of the access point contained in the received restart generation notification message to medium access control information held by a wireless terminal and corresponding to an access point to which the wireless terminal belongs; and

performing a scanning operation for address resolution protocol registration with the access point using the wireless network when the medium access control information transmitted from the access point and the medium access control information held by the wireless terminal match each other as a result of the comparison.

9. The method of claim 8, wherein the restart generation notification message transmitted from the access point includes identifier information and restart information of the access point.

10. The method of claim 9, wherein the identifier information of the access point includes at least one of medium access control address information, Basic Service Set identifier information, and Extended Service Set identifier information of the access point.

11. The method of claim 8, wherein performing the scanning operation includes the steps of:

transmitting a join request signal to the access point over the wireless network;

transmitting a probe request signal to the access point when a response signal in response to the join request signal is received from the access point over the wireless network;

transmitting a medium access control authentication request signal to the access point when a response signal in response to the probe request signal is received from the access point; and

when a medium access control authentication response signal in response to the medium access control authentication request signal is received from the access point, transmitting an association request signal to the access point and receiving a response signal in response to the association request signal.

12. The method of claim 8, wherein the restart generation notification message transmitted from the access point over the wireless network is included in a beacon signal periodically transmitted from the access point.

13. A method for rebuilding a wireless terminal address resolution protocol (ARP) table of an access point using a wireless network, the method comprising the steps of:

when the access point is restarted, transmitting a restart generation notification message as broadcast data to wireless terminals over the wireless network;

receiving, at a wireless terminal, the restart generation notification message transmitted as broadcast data from the access point over the wireless network, and comparing medium access control information of the access point included in the received restart generation notification message to medium access control information held by the wireless terminal and corresponding to an access point to which the wireless terminal belongs;

transmitting registration information for ARP registration from the wireless terminal to the access point over the wireless network when the medium access control information transmitted from the access point and the medium access control information held by the wireless terminal match each other as a result of the comparison; and

building the address resolution protocol table for at least one wireless terminal belonging to a service area of the access point based on the registration information from the wireless terminal to the access point.

14. The method of claim 13, wherein the restart generation notification message transmitted as the broadcast data from the access point to the wireless terminal includes identifier information and restart information of the access point.

15. The method of claim 14, wherein the identifier information of the access point includes at least one of medium access control address information, Basic Service Set identifier information, and Extended Service Set identifier information of the access point.

16. The method of claim 13, wherein the restart generation notification message transmitted from the access point to the wireless terminal over the wireless network is included in a beacon signal and transmitted, the beacon signal being periodically transmitted from the access point to the wireless terminals.

17. An apparatus for rebuilding a wireless terminal address resolution protocol table of an access point using a wireless network, said apparatus comprising:

a data generator for generating broadcast data in response to a provided data generation control signal when the access point is restarted, the broadcast data containing a restart generation notification message of the access point;

a transceiver for transmitting the broadcast data to wireless terminals over the wireless network, the broadcast data containing the restart generation notification message generated by said data generator, and for receiving terminal registration information transmitted from at least one wireless terminal which receives the restart generation notification message and belongs to a service, area of the access point; and

a controller for building the address resolution protocol table using the terminal registration information for the wireless terminals received via said transceiver.

18. The apparatus of claim 17, wherein the restart generation notification message in the broadcasting data generated by said data generator includes identifier information and restart information of the access point.

19. The apparatus of claim 18, wherein the identifier information of the access point includes at least one of medium access control address information, Basic Service Set identifier information, and Extended Service Set identifier information of the access point.

20. The apparatus of claim 17, wherein said transceiver transmits a join response signal to said at least one wireless terminal over the wireless network when a join request signal is received from said at least one wireless terminal;

said transceiver transmits a probe response signal to said at least one wireless terminal receiving the join response signal over the wireless network when a probe request signal is received from said at least one wireless terminal;

said transceiver transmits a medium access control authentication response signal to said at least one wireless terminal receiving the probe response signal when a medium access control authentication signal is received from said at least one wireless terminal; and

said transceiver transmits an association response signal in response to an association request signal when the association request signal is received from said at least one wireless terminal receiving the medium access control authentication response signal, and then provides the registration information for said at least one wireless terminal to said controller.

21. The apparatus of claim 17, wherein the restart generation notification message is added to a beacon signal and transmitted, the beacon signal being transmitted periodically to said at least one wireless terminal.

22. In a wireless terminal connected to an access point over a wireless network, an apparatus for detecting a restart of the access point, said apparatus comprising:

a controller for receiving a restart generation notification message transmitted as broadcast data from the access point over the wireless network, and responsive thereto for comparing and analyzing medium access control information of the access point contained in the received restart generation notification message to medium access control information of the access point reserved by said controller; and

a transceiver for receiving the restart generation notification message transmitted as the broadcast data from the access point, and for transmitting terminal registration information for address resolution protocol registration to the access point over the wireless network when the medium access control information received from the access point and the medium access control information reserved by said controller match each other as a result of the comparing of the medium access control information by said controller.

23. The apparatus of claim 22, wherein the restart generation notification message transmitted from the access point includes identifier information and restart information for the access point.

24. The apparatus of claim 23, wherein the identifier information of the access point includes at least one of medium access control address information, Basic Service Set identifier information, and Extended Service Set identifier information of the access point.

25. The apparatus of claim 22, wherein said transceiver transmits a join request signal to the access point over the wireless network;

said transceiver transmits a probe request signal to the access point when a first response signal in response to the join request signal is received from the access point over the wireless network;

said transceiver transmits a medium access control authentication request signal to the access point when a second response signal in response to the probe request signal is received from the access point; and

said transceiver transmits an association request signal to the access point and receives a third response signal in response to the association request signal when receiving, from the access point, a medium access control authentication response signal in response to the medium access control authentication request signal.

26. The apparatus of claim 22, wherein the restart generation notification message transmitted from the access point over the wireless network is included in a beacon signal, the beacon signal being periodically transmitted from the access point.