Wireless LAN system for predicting movement destination of child station and wireless LAN parent station therefor

• US 20040105417A1
• Filed: 11/26/2003
• Published: 06/03/2004
• Est. Priority Date: 11/28/2002
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Infrontia Corporation (NEC Corporation)
• Inventors: Kobayashi, Yoshikazu, Hosoda, Hironori
• Granted Patent: US 7,269,154 B2
• Time in Patent Office: Days
• US Class Current: 370/338
• CPC Class Codes: H04W 28/26 Resource reservation
• CPC Class Codes: H04W 36/32 by location or mobility data, e.g. speed data
• CPC Class Codes: H04W 36/322 by location data

Abstract

In the wireless LAN system including the child station and parent stations, when each parent station detects handover of the child station during QoS communication through a wireless communication section, a table control section acquires the table where MAC addresses of movement destination parent stations have been registered and the band reserving request signal transmitting section transmits the band reserving request frame to the parent stations through a LAN communication section via Ethernet. The table control section includes a registering means which registers the acquired table, a deleting means which deletes the table and a managing means which updates and manages the table.

Claims

1. A wireless LAN system for predicting movement destination of a child station, which includes the child station and parent stations, wherein

each parent station comprises:

a wireless communication section for conducting communication with the child station;

a table control section for acquiring a table in which MAC address of each movement destination parent station has been registered, when handover of the child station put under QoS communication is detected through the wireless communication section;

a band reserving request signal transmitting section for sending a transmission instruction of the band reserving request frame to the movement destination parent station; and

a LAN communication section for receiving the transmission instruction and transmitting the band reserving request frame to the movement destination parent station via LAN.

2. The wireless LAN system for predicting movement destination of the child station according to claim 1, wherein

said parent station further comprises a signal strength measuring section for receiving and quantifying a beacon signal of at least one adjacent parent station of the parent stations,

said table control section receives information of the qualified beacon signal and produces the table obtained by selecting and registering only the parent station which generates a signal with a constant value or more thereby handling the table as movement destination parent station position information, and

when the child station is moved, the band reserving request frame is transmitted to the parent station which is predicted as the movement destination on the basis of the movement destination parent station position information which the table control section has.

3. The wireless LAN system for predicting movement destination of a child according to claim 1, wherein

said parent station further comprises a movement direction determining section for comparing MAC addresses of the parent stations existing in a movement source and the movement destination of the child station with each other, and for nullifying the transmission instruction of the reserving request to the band reserving request signal transmitting section, when the MAC addresses are the same.

4. The wireless LAN system for predicting movement destination of a child according to claim 2, wherein

said parent station further comprises a movement direction determining section for comparing MAC addresses of the parent stations existing in a movement source and the movement destination of the child station with each other, and for nullifying the transmission instruction of the reserving request to the band reserving request signal transmitting section, when the MAC addresses are the same.

5. The wireless LAN system for predicting movement destination of a child according to claim 1, further comprising a local area route information server for providing route information in a local area to each parent station in LAN, wherein

said parent station further comprises a route state determining section for storing the route information about a direction in which the child station can not be moved and nullifying a transmission instruction of the reserving request to the parent station positioned in the direction in which the child station can not be moved to the band reserving request signal transmitting section on the basis of the route information.

6. The wireless LAN system for predicting movement destination of a child according to claim 2, further comprising a local area route information server for providing route information in a local area to each parent station in LAN, wherein

said parent station further comprises a route state determining section for storing the route information about a direction in which the child station can not be moved and nullifying a transmission instruction of the reserving request to the parent station positioned in the direction in which the child station can not be moved to the band reserving request signal transmitting section on the basis of the route information.

7. The wireless LAN system for predicting movement destination of a child according to claim 3, further comprising a local area route information server for providing route information in a local area to each parent station in LAN, wherein

said parent station further comprises a route state determining section for storing the route information about a direction in which the child station can not be moved and nullifying a transmission instruction of the reserving request to the parent station positioned in the direction in which the child station can not be moved to the band reserving request signal transmitting section on the basis of the route information.

8. The wireless LAN system for predicting movement destination of a child according to claim 1, wherein

said table control section counts the number of movement times of the child station for each aspect of movement source per movement destination from association setting information at a handover time to produce the table obtained by calculating movement destination ratios of the child station, and instructs to transmit the band reserving request frame to the parent station with the highest movement probability of the table.

9. The wireless LAN system for predicting movement destination of a child according to claim 2, wherein

said table control section counts the number of movement times of the child station for each aspect of movement source per movement destination from association setting information at a handover time to produce the table obtained by calculating movement destination ratios of the child station, and instructs to transmit the band reserving request frame to the parent station with the highest movement probability of the table.

10. The wireless LAN system for predicting movement destination of a child according to claim 3, wherein

said table control section counts the number of movement times of the child station for each aspect of movement source per movement destination from association setting information at a handover time to produce the table obtained by calculating movement destination ratios of the child station, and instructs to transmit the band reserving request frame to the parent station with the highest movement probability of the table.

11. The wireless LAN system for predicting movement destination of a child according to claim 5, wherein

said table control section counts the number of movement times of the child station for each aspect of movement source per movement destination from association setting information at a handover time to produce the table obtained by calculating movement destination ratios of the child station, and instructs to transmit the band reserving request frame to the parent station with the highest movement probability of the table.

12. A wireless LAN parent station for predicting movement destination of a child station, comprising:

a wireless communication section for conducting wireless communication with the child station;

a table control section for acquiring a table in which MAC address of each movement destination parent station has been registered, when handover of the child station put under QoS communication has been detected through said wireless communication section;

a band reserving request signal transmitting section for sending a transmission instruction of a band reserving request frame to the movement destination parent station; and

a LAN communication section for receiving the transmission instruction and transmitting the band reserving request frame to the movement destination parent station via LAN.