Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Reexamination Certificate
1997-06-20
2001-11-06
Kincaid, Lester G. (Department: 2682)
Telecommunications
Transmitter and receiver at separate stations
Plural transmitters or receivers
C455S528000, C455S414200
Reexamination Certificate
active
06314300
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a mobile communication for carrying out multiple simultaneous communications using a plurality of independent calls on each mobile terminal device.
2. Description of the Background Art
As shown in
FIG. 1
, the conventional mobile communication system generally comprises a mobile terminal device
100
and a network device
101
which are connected through a communication channel
103
. The mobile terminal device
100
and the network device
101
are provided with respective call control units
104
and
105
so that the call origination control and the call termination control are carried out by the call control units
104
and
105
.
In such a conventional mobile communication system, a possibility of more than one simultaneous communications on a single mobile terminal device has not been taken into account, so that the communication state and the call state of the mobile terminal device are expected to be identical during the communication, and for this reason no function for managing the communication state of the mobile terminal device has been provided in either the mobile terminal device
100
or the network device
101
.
Because of this lack of a function for managing the communication state of the mobile terminal device, it has been impossible in the conventional mobile communication system to ascertain the correspondences between the call control unit
104
of the mobile terminal device
100
and the call control unit
105
of the network device
101
.
As a consequence, if more than one simultaneous communications are attempted On a single mobile terminal device by simply providing additional transmission and reception devices and using the conventional call management scheme, there arises a problem that the network device
101
would carry out the unnecessary paging operation when the subsequent call is terminated at that mobile terminal device, despite of the fact that the network device
101
already ascertained the channel connection target from the earlier communication.
In addition, there is also a problem that it has been impossible to collectively control all or a part of the call states on the mobile terminal device
100
.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a mobile communication system which is capable of supporting multiple simultaneous communications on a single mobile terminal device, without causing a problem of the unnecessary paging operation by the network device in response to the subsequent call while being in a state of already ascertained the channel connection target from the earlier communication.
It is another object of the present invention to provide a mobile communication system which is capable of collectively controlling all or a part of call states on a mobile terminal device.
According to one aspect of the present invention there is provided a mobile communication system, comprising: at least one mobile terminal device having: more than one mobile terminal side call control units for controlling calls at a mobile terminal side; and a mobile terminal side mobile terminal management unit for managing a communication state of the mobile terminal device while identifying each mobile terminal side call control unit which is currently in communication; and a network device having: a plurality or network side call control units for controlling calls at a network side; and a network side mobile terminal management unit, provided in correspondence to the mobile terminal device, for managing the communication state of the mobile terminal device and correspondences between said plurality of network side call control units and the mobile terminal device while identifying each network side call control unit which is currently in communication.
Other features and advantages of the present invention will become apparent from the following description taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 4972507 (1990-11-01), Lusignan
patent: 5101500 (1992-03-01), Marui
patent: 5287552 (1994-02-01), Sasuta et al.
patent: 5355518 (1994-10-01), Kindinger et al.
patent: 5428666 (1995-06-01), Fyfe et al.
patent: 5608780 (1997-03-01), Gerszberg et al.
patent: 5926755 (1999-07-01), Ghisler
patent: 5960365 (1999-09-01), Leih et al.
Kaiyama Akira
Miki Mutsumaru
Nakashima Akiko
Yamagata Katsuhiko
Kincaid Lester G.
NTT Mobile Communications Network Inc.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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