Wireless communication system and method of conducting wireless communication

• US 20070081533A1
• Filed: 12/06/2006
• Published: 04/12/2007
• Est. Priority Date: 10/27/2000
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Mizukoshi, Yasuhiro
• Granted Patent: US 8,249,090 B2
• Time in Patent Office: Days
• US Class Current: 370/389
• CPC Class Codes: H04L 2101/622 Layer-2 addresses, e.g. medium access control [MAC] addresses
• CPC Class Codes: H04L 9/40 Network security protocols
• CPC Class Codes: H04W 40/02 Communication route or path selection, e.g. power-based or shortest path routing
• CPC Class Codes: H04W 40/24 Connectivity information management, e.g. connectivity discovery or connectivity update
• CPC Class Codes: H04W 80/00 Wireless network protocols or protocol adaptations to wireless operation

Abstract

A wireless communication system includes a plurality of base stations, a mobile wireless communication device which makes wireless communication with the base stations, a terminal device, and a router through which the base stations make communication with an IP network. The terminal device transmits an address thereof to the mobile wireless communication device, before the mobile wireless communication device makes link with one of the base stations. The terminal device fabricates a frame addressed to an address of the router, and transmits the frame to the router, after the mobile wireless communication device has made link with one of the base stations. The router transmits an address thereof to the base stations, before the mobile wireless communication device makes link with one of the base stations. The router fabricates a frame addressed to an address of the terminal device, and transmits the frame to the terminal device, after the mobile wireless communication device has made link with one of the base stations.

Claims

1. A router through which each of base stations each having a mobile wireless communication device makes wireless communication with an IP network, comprising:

(a) a first controller which transmits data including an address of said router, to said base stations;

(b) a second controller which includes a routing table in which data about routes in which IP packets are transmitted to a mobile terminal device is stored, and determines destination to which IP packets are to be transmitted; and

(c) a third controller which updates said routing table in accordance with data indicating that said mobile terminal device has moved away, transmitted from said mobile terminal device.

2. A wireless base station which makes wireless communication with a mobile wireless communication device, comprising:

(a) an interface through which said wireless base station makes wireless communication with said mobile wireless communication device;

(b) a message transceiver which transmits messages to and receives messages from a router and base stations making communication with said router; and

(c) a memory which stores an address of said router, an address of a terminal device making communication with said mobile wireless communication device, and a message indicating that said terminal device has moved away.

3. The wireless base station as set forth in claim 2, wherein said message transceiver transmits said message to said router on behalf of said terminal device, when a link between said wireless base station and said mobile wireless communication device has been established.

4. The wireless base station as set forth in claim 2, wherein said message transceiver, on receipt of an address of said terminal device, transmits an address of said terminal-device to a base station or base stations with which said router makes communication.

5. The wireless base station as set forth in claim 2, wherein said message transceiver, on receipt of a broadcast packet, judges whether an address of a transmitter of said broadcast packet is an address of said router, and transmits said broadcast packet to said mobile wireless communication device with which said wireless base station has made link, if said address of a transmitter of said broadcast packet is an address of said router.

6. The wireless base station as set forth in claim 5, wherein said message transceiver transmits said broadcast packet only to said router, if said address of a transmitter of said broadcast packet is not an address of said router.

7. A mobile wireless communication device capable of making wireless communication with a base station, comprising:

(a) an interface through which said mobile wireless communication device makes wireless communication with said base station;

(b) a message transceiver which transmits messages to and receives messages from a terminal device which can make wireless communication with said mobile wireless communication device; and

(c) a memory which stores an address of said terminal device, an address of a router, and data indicating where each of base stations is.

8. A terminal device transmitting IP packets to and receiving IP packets from a mobile wireless communication device, comprising:

(a) a controller which transmits an address of said terminal device to said mobile wireless communication device; and

(b) a message transceiver which transmits a message indicating that said terminal device has moved away, to said mobile wireless communication device.