Wireless communication system and method of conducting wireless communication

• US 8,249,090 B2
• Filed: 12/06/2006
• Issued: 08/21/2012
• Est. Priority Date: 10/27/2000
• Status: Expired due to Fees

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Mizukoshi, Yasuhiro
• Primary Examiner(s): GREY, CHRISTOPHER P
• Application Number:
  US11/634,187
• Publication Number:
  US 20070081533A1
• Time in Patent Office: 2,085 Days
• Field of Search: 370/331, 370/338, 370401-404, 370/389, 370/328, 370/332, 370/392, 370/395.31, 370/395.52, 370/400, 370/432, 455/422.1, 455/436, 455/437, 455/438, 455/439, 455/442, 455/557, 455/569.2
• US Class Current: 370/432
• 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 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 transmits messages using a broadcast destination address to and receives messages from a plurality of base stations making communication with said router, the router and the plurality of base stations being provided on a same broadcast link as the wireless base station, each of said plurality of base stations is a physically separate device from and remotely wired to said router; and

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

wherein each of said plurality of terminal devices is a physically separate device from and remotely wired to said mobile wireless communication device, and

wherein said message transceiver, on receipt of a broadcast packet, judges whether a source address of said broadcast packet is the address of said router stored in said memory, and transmits said broadcast packet to said mobile wireless communication device with which said wireless base station has made link, upon said source address of said broadcast packet being the address of said router stored in said memory.

2. The wireless base station as set forth in claim 1, wherein said message transceiver transmits said broadcast packet only to said router, upon said source address of said broadcast packet not being the address of said router stored in said memory.

3. 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 transmits messages using a broadcast destination address to and receives messages from a plurality of base stations making communication with said router, the router and the plurality of base stations being provided on a same link as the wireless base station, each of said plurality of base stations is a physically separate device from and remotely wired to said router; and

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

wherein each of said plurality of terminal devices is a physically separate device from and remotely wired to said mobile wireless communication device, and,

said message transceiver, on receipt of a broadcast packet, judges whether a source address of said broadcast packet is the address of said router stored in said memory, and transmits said broadcast packet to said mobile wireless communication device with which said wireless base station has made link, upon said source address of said broadcast packet being the address of said router stored in said memory.