Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2001-02-08
2004-07-13
Vo, Nguyen T. (Department: 2682)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S436000, C455S438000
Reexamination Certificate
active
06763235
ABSTRACT:
FIELD OF THE INVENTION
The present invention in general relates to a technology applied in mobile terminals such as portable telephones and portable information equipments, or mobile communication control devices. This invention particularly relates to a technology which reduces the labor required for network management and control load relating to hand-over (switchover of containing radio base stations).
BACKGROUND OF THE INVENTION
In recent years, with the explosive spread of mobile terminals, network control and management tend to become increasingly complicated. During hand-over for smoothly switching over containing radio base stations following the area movement of a mobile terminal, particularly, it is necessary to make equipment on the network cooperate with one another. Due to this, the problem of network control and management load appears. Means and methods for effectively solving this problem have been, therefore, demanded.
FIG. 9
is a block diagram that shows the constitution of a conventional mobile communication system. As shown in this figure, a fixed telephone
1
is installed in, for example, a company or house and serves as a terminal establishing voice-communication with a mobile terminal
10
to be described later or other fixed telephones through an external network
2
. A switchboard
3
is contained in the external network
2
and switches over calls. A management server
4
manages positional information indicating the position (area) at which the mobile terminal
10
is present. A region main switchboard
5
is contained in a mobile communication network
6
and switches over calls.
A switchboard
7
1
is contained in the mobile communication network
6
and switches over mobile communication calls. This switchboard
7
1
contains radio base stations
8
1
and
8
2
. The radio base station
8
1
establishes communication with the mobile terminal within an area
9
1
through a radio line. The radio base station
8
2
establishes communication with a mobile terminal within an area
9
2
adjacent the area
9
1
through a radio line.
A switchboard
7
2
is contained in the mobile communication network
6
and switches over mobile communication calls. This switchboard
7
2
contains radio base stations
8
3
and
8
4
. The radio base station
8
3
establishes communication with the mobile terminal within an area
9
3
adjacent the area
9
2
through a radio line. The radio base station
8
4
establishes communication with the mobile terminal within an area
9
4
adjacent the area
9
3
through a radio line.
The mobile terminal
10
is a portable telephone or the like and establishes radio-communication with any one of the radio base stations
8
1
to
8
4
if the terminal
10
is located in any one of the areas
9
1
to
9
4
. The mobile terminal
10
regularly informs the management server
4
of positional information. Here, in the areas
9
1
to
9
4
stated above, a multi-area method by which adjacent two areas are set to overlap each other is adopted. In the overlapping areas, therefore, the mobile terminal
10
informs the management server
4
of information on two positions.
With the above constitution, when the fixed telephone
1
calls the mobile terminal
10
, the call from the fixed telephone
1
reaches the switchboard
3
through the external network
2
. Accordingly, the switchboard
3
accesses the management server
4
and acquires positional information on the mobile terminal
10
. In this case, it is assumed that the mobile terminal
10
is located in the area
9
1
. Next, the switchboard
3
switches over the call to the regional main switchboard
5
. Accordingly, a wire line is set in the route of the mobile communication network
6
, the switchboard
7
1
and the radio base station
8
1
and further the mobile terminal
10
in the area
9
1
is called by the radio base station
8
1
through the radio line. When the mobile terminal
10
responds to the call, a line is established between the fixed telephone
1
and the mobile terminal
10
.
Assumed that the mobile terminal
10
is moving from the area
9
1
to the area
9
2
while the communication line is being established. Namely, the mobile terminal
10
is located in a portion in which the areas
9
1
and
9
2
overlap each other. Therefore, the mobile terminal
10
informs the management server
4
of not only positional information corresponding to the area
9
1
but also that corresponding to the area
9
2
through the radio base station
8
2
, the switchboard
7
1
, the mobile communication network
6
and the regional main switchboard
5
.
Here, if a reception field intensity corresponding to the radio base station
8
2
exceeds that corresponding to the radio base station
8
1
, the mobile terminal
10
informs the radio base station
8
2
of a switchover request for switching over the containing radio base station from the radio base station
8
1
to the radio base station
8
2
. Following this, the radio base station
8
2
informs the management server
4
of the switchover request by way of the switchboard
7
1
, the mobile communication network
6
and the regional main switchboard
5
.
The management server
4
notifies the switchboard
7
1
that the containing radio base station of the mobile terminal
10
should be switched over from the radio base station
8
1
to the radio base station
8
2
. By doing so, information necessary for line control is transmitted from the radio base station
8
1
to the radio base station
8
2
through the switchboard
7
1
. When receiving the information, the radio base station
8
2
establishes a radio line with the mobile terminal
10
in the area
9
2
. Next, the radio base station
8
1
disconnects the radio line with the mobile terminal
10
. In this way, the mutual cooperation among the switchboard
7
1
, the radio base station
8
1
, the radio base station
8
2
and the management server
4
conventionally allows smooth switchover (hand-over) from the radio base station
8
1
to the radio base station
8
2
.
In the meantime, as already described above, during hand-over in mobile communications, control and management are required to make a plurality of equipment (the radio base station
8
1
, the switchboard
7
1
, the management server
4
and the like) at the wire network side cooperate with one another. However, during the hand-over, since it is necessary to communicate information among the equipment and to conduct complex control, great network management and control load is generated. Particularly, in circumstances where the number of operating mobile terminals increases rapidly, the network management and control load increases steadily, accordingly.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a method and system for mobile communication which reduces a work load of network control and management during hand-over. It is another object of this invention to provide a computer readable recording medium that stores a computer program which when executed realizes the method according to the present invention.
The mobile communication system according to the present invention comprises a management server which manages a fixed address of the mobile terminal and not less than one dynamic address dynamically allotted to the mobile terminal within not less than one service area and a host transmitting information with the fixed address used as a header. The mobile terminal notifies the management server of the dynamic address in a real time manner, and notifies, if stretching over at least two service areas, the management server of a first dynamic address and a second dynamic address corresponding to the at least two service areas. The management server transfers the information with the first dynamic address and the second dynamic address used as a header if the information is transmitted from the host and the first dynamic address and the second dynamic address are allotted to the mobile terminal.
Thus, if one or more dynamic addresses of the mobile terminal are managed unitarily by the manageme
Behulu A.
Fujitsu Limited
Staas & Halsey , LLP
Vo Nguyen T.
LandOfFree
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