Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Reexamination Certificate
2000-01-13
2003-11-11
Hsu, Alpus H. (Department: 2662)
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
C370S338000, C370S389000, C455S433000, C455S450000, C709S202000
Reexamination Certificate
active
06646999
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Intention
The present invention relates to a mobile packet communication system that supports data communications, including Internet communications, in a high-speed mobile communication system such as a cellular communication network. Currently, studies on next generation mobile communication systems are proceeding in research institutes, standards bodies, and other organizations in various countries of the world, aiming to provide multimedia communication services, including high-speed data communications up to 2 Mbps, in the next generation of mobile communication systems.
Among others, packet communication services, including the Internet, are expected to displace the current mobile communication services intended primarily for voice communication and to become the core communication service in the next generation of mobile communication systems. Furthermore, studies have begun on communication networks that integrate mobile terminals connected to mobile radio communication networks and fixed equipment including Internet service providers (ISPS) and LANs within user premises.
2. Description of the Related Art
FIG. 20
is a diagram showing the configuration of a prior art mobile packet communication system in a cellular communication network. The mobile packet communication system comprises mobile terminals
20
-
1
-
1
to
20
-
1
-
2
, subscriber nodes
20
-
2
-
1
to
20
-
2
-
3
, gate nodes
20
-
3
-
1
to
20
-
3
-
2
, and location registration servers
20
-
4
-
1
to
20
-
4
-
3
, and is connected via the gate nodes
20
-
3
-
1
to
20
-
3
-
2
to fixed equipment
20
-
5
-
1
to
20
-
5
-
2
, such as an Internet service provider (ISP) or a local area network (LAN) within user premises, connected to a fixed network.
The location registration servers
20
-
4
-
1
to
20
-
4
-
3
are provided, one for each group of terminal numbers (for example, E.
164
addresses) having the same high-order digits and assigned to the mobile terminals
20
-
1
-
1
to
20
-
1
-
2
, and each of the location registration servers
20
-
4
-
1
to
20
-
4
-
3
includes a location register
20
-
6
. E. 164 is the international standard telephone numbering (terminal addressing) scheme defined by the ITU-T.
The location register
20
-
6
stores for each of the mobile terminals
20
-
1
-
1
to
20
-
1
-
2
the address [ADR
6
-
8
] of its current location (the subscriber node,
20
-
2
-
1
to
20
-
2
-
3
, currently serving the mobile terminal) and the address [ADR
4
-
5
] of the gate node,
20
-
3
-
1
to
20
-
3
-
2
, connected to the user LAN or the ISP to which the mobile terminal,
20
-
1
-
1
to
20
-
1
-
2
, subscribes.
The subscriber nodes
20
-
2
-
1
to
20
-
2
-
3
and the gate nodes
20
-
3
-
1
to
20
-
3
-
2
each include a server search table
20
-
7
which is used to search for the addresses [ADR
1
to ADR
3
] of the location registration servers
20
-
4
-
1
to
20
-
4
-
3
by reference to the high-order digits of the numbers of the mobile terminals
20
-
1
-
1
to
20
-
1
-
2
.
Each of the gate nodes
20
-
3
-
1
to
20
-
3
-
2
further includes an address translation table
20
-
8
which is used to translate the address (IP address) contained in the header of a packet arriving from an external ISP or LAN into the number of a corresponding one of the mobile terminals
20
-
1
-
1
to
20
-
1
-
2
.
FIG. 21
is a diagram for explaining the location registration operation for a moving mobile terminal in the prior art mobile packet communication system. In the figure, the configuration of the mobile packet communication system is the same as that shown in
FIG. 20
, and the same elements are designated by the same reference numerals. The location registration is performed in accordance with the following procedure consisting of steps (1) to (4)
(1) As the mobile terminal
20
-
1
-
1
moves into a new radio zone, it sends a location registration request to the subscriber node
20
-
2
-
1
in the new radio zone.
(2) Upon receiving the location registration request message from the mobile terminal
20
-
1
-
1
, the subscriber node
20
-
2
-
1
searches the server search table
20
-
7
by reference to the high-order digit part [
020
] of the number [
020
-xxx
1
] of the mobile terminal
20
-
1
-
1
, and retrieves the address [ADR
1
] of the corresponding location registration server.
(3) Location registration information (the address [ADR
6
] of the subscriber node
20
-
2
-
1
) is transferred to the corresponding location registration server
20
-
4
-
1
.
(4) The location registration server
20
-
4
-
1
updates the location register
20
-
6
based on the received location registration information.
FIG. 22
is a diagram for explaining the operation for packet transfer from the fixed equipment
20
-
5
-
2
, such as an ISP or a user LAN, to the mobile terminal
20
-
1
-
1
. In the figure, the configuration of the mobile packet communication system is the same as that shown in
FIG. 20
, and the same elements are designated by the same reference numerals. The packet transfer operation is performed in accordance with the following procedure consisting of steps (1) to (8).
(1) A packet containing the destination address [
1
.
1
.
1
] arrives at the gate node
20
-
3
-
2
from the fixed equipment
20
-
5
-
2
such as an ISP or a user LAN.
(2) The gate node
20
-
3
-
2
obtains the mobile terminal number [
020
-xxx
1
] from the destination address [
1
.
1
.
1
] by looking it up in the address translation table
20
-
8
.
(3) Further, the gate node
20
-
3
-
2
searches the server search table
20
-
7
by reference to the mobile terminal number [
020
-xxx
1
] obtained in the above step, and retrieves the address [ADR
1
] of the corresponding location registration server
20
-
4
-
1
.
(4) The gate node
20
-
3
-
2
requests the location registration server
20
-
4
-
1
of the address [ADR
1
] to send the location information concerning the designated mobile terminal.
(5) In response to the request, the location registration server
20
-
4
-
1
searches the location register
20
-
6
by reference to the number [
020
-xxx
1
] of the designated mobile terminal, and
(6) returns the location information (subscriber node address=[ADR
6
]) concerning the designated mobile terminal to the gate node
20
-
3
-
2
.
(7) The gate node
20
-
3
-
2
that received the location information appends the mobile terminal location information (subscriber node address=[ADR
6
]) to the packet received from the fixed equipment
20
-
5
-
2
, and transfers the packet to the subscriber node
20
-
2
-
1
.
(8) The subscriber node
20
-
2
-
1
designated by the subscriber node address=[ADR
6
] receives the packet, and transfers the packet to the destination mobile terminal
20
-
1
-
1
after removing the location information (subscriber node address) from the packet.
FIG. 23
is a diagram for explaining the operation for packet transfer from the mobile terminal
20
-
1
-
2
to the fixed equipment
20
-
5
-
1
such as an ISP or a user LAN. In the figure, the configuration of the mobile packet communication system is the same as that shown in
FIG. 20
, and the same elements are designated by the same reference numerals. The packet transfer operation is performed in accordance with the following procedure consisting of steps (1) to (7).
(1) The mobile terminal
20
-
1
-
2
sends a communication start request to the subscriber node
20
-
2
-
3
.
(2) The subscriber node
20
-
2
-
3
that received the communication start request searches the server search table
20
-
7
by reference to the number [
020
-xxx
2
] of the mobile terminal that issued the communication start request, and retrieves the address [ADR
1
] of the corresponding location registration server.
(3) The subscriber node
20
-
2
-
3
requests the location registration server
20
-
4
-
1
of the address [ADR
1
&rsqb
Kato Tsuguo
Ono Hideaki
Takechi Ryuichi
Wakamoto Masaaki
Fujitsu Limited
Hsu Alpus H.
Katten Muchin Zavis & Rosenman
Qureshi Afsar M.
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