Wireless communication system and method of conducting wireless communication

A wireless communication system comprising:

• (a) a plurality of base stations each having a wireless communication device;
• (b) at least one mobile wireless communication device which makes wireless communication with said base stations;
• (c) at least one terminal device transmitting IP packets to and receiving IP packets from said mobile wireless communication device;
• and
• (d) a router through which said base stations make communication with an IP network,
• wherein said terminal device informs said mobile wireless communication device that said terminal device has moved away, before said mobile wireless communication device makes link with one of said base stations,
• said mobile wireless communication device informs said one of said base stations that said terminal device has moved away, when said mobile wireless communication device makes link with said one of said base stations,
• said one of said base stations informs said router that said terminal device has moved away, after said mobile wireless communication device has made link with said one of said base stations.

A wireless communication system comprising:

• (a) a plurality of base stations each having a wireless communication device;
• (b) at least one mobile wireless communication device which makes wireless communication with said base stations;
• (c) at least one terminal device transmitting IP packets to and receiving IP packets from said mobile wireless communication device;
• and
• (d) a router through which said base stations make communication with an IP network,
• wherein said terminal device transmits an address of said terminal device to said mobile wireless communication device, before said mobile wireless communication device makes link with one of said base stations,
• said mobile wireless communication device transmits an address of said terminal device to said one of said base stations, when said mobile wireless communication device makes link with said one of said base stations,
• said one of said base stations transmits an address of said terminal device to a base station or base stations to which said router makes communication with.

A wireless communication system comprising:

• (a) a plurality of base stations each having a wireless communication device;
• (b) at least one mobile wireless communication device which makes wireless communication with said base stations;
• (c) at least one terminal device transmitting IP packets to and receiving IP packets from said mobile wireless communication device;
• and
• (d) a router through which said base stations make communication with an IP network,
• wherein each of said base stations, 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 each of said base stations has made link, if said address of a transmitter of said broadcast packet is an address of said router.

A method of conducting wireless communication in a wireless communication system comprising:

• (a) a plurality of base stations each having a wireless communication device;
• (b) at least one mobile wireless communication device which makes wireless communication with said base stations;
• (c) at least one terminal device transmitting IP packets to and receiving IP packets from said mobile wireless communication device;
• and
• (d) a router through which said base stations make communication with an IP network,
• said method comprising the steps of:
• (a) transmitting an address of said terminal device to said mobile wireless communication device from said terminal device, and transmitting an address of said router to one of said base stations from said router, before said mobile wireless communication device makes link with said one of said base stations;
• (b) said terminal device fabricating a frame addressed to an address of said router having been received through said mobile wireless communication device, and transmitting the thus fabricated frame to said router through both said mobile wireless communication device and said one of said base stations, after said mobile wireless communication device has made link with one of said base stations;
• and
• (c) said router fabricating a frame addressed to an address of said terminal device having been received through said one of said base stations, and transmitting the thus fabricated frame to said terminal device through both said mobile wireless communication device and said one of said base stations, after said mobile wireless communication device has made link with one of said base stations.

A method of conducting wireless communication in a wireless communication system comprising:

• (a) a plurality of base stations each having a wireless communication device;
• (b) at least one mobile wireless communication device which makes wireless communication with said base stations;
• (c) at least one terminal device transmitting IP packets to and receiving IP packets from said mobile wireless communication device;
• and
• (d) a router through which said base stations make communication with an IP network,
• said method comprising the steps of:
• (a) said terminal device informing said mobile wireless communication device that said terminal device has moved away, before said mobile wireless communication device makes link with one of said base stations;
• (b) said mobile wireless communication device informing said one of said base stations that said terminal device has moved away, when said mobile wireless communication device makes link with said one of said base stations;
• (c) said one of said base stations informing said router that said terminal device has moved away, after said mobile wireless communication device has made link with said one of said base stations.

A method of conducting wireless communication in a wireless communication system comprising:

• (a) a plurality of base stations each having a wireless communication device;
• (b) at least one mobile wireless communication device which makes wireless communication with said base stations;
• (c) at least one terminal device transmitting IP packets to and receiving IP packets from said mobile wireless communication device;
• and
• (d) a router through which said base stations make communication with an IP network,
• said method comprising the steps of:
• (a) said terminal device transmitting an address thereof to said mobile wireless communication device, before said mobile wireless communication device makes link with one of said base stations;
• (b) said mobile wireless communication device transmitting an address of said terminal device to said one of said base stations, when said mobile wireless communication device makes link with said one of said base stations;
• and
• (c) said one of said base stations transmitting an address of said terminal device to a base station or base stations to which said router makes communication with.

A method of conducting wireless communication in a wireless communication system comprising:

• (a) a plurality of base stations each having a wireless communication device;
• (b) at least one mobile wireless communication device which makes wireless communication with said base stations;
• (c) at least one terminal device transmitting IP packets to and receiving IP packets from said mobile wireless communication device;
• and
• (d) a router through which said base stations make communication with an IP network,
• said method comprising the steps of:
• (a) each of said base stations, on receipt of a broadcast packet, judging whether an address of a transmitter of said broadcast packet is an address of said router;
• and
• (b) said one of said base stations transmitting said broadcast packet to said mobile wireless communication device with which said each of said base stations has made link, if said address of a transmitter of said broadcast packet is an address of said router.

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.

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.

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.