Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Reexamination Certificate
2001-08-02
2004-11-30
Ton, Dang (Department: 2660)
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
C370S352000
Reexamination Certificate
active
06826167
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates in general to a mobile communication system. More particularly, the invention relates to a mobile communication system in which the communication is carried out among a line switched mobile communication system, a packet switched mobile communication system and a line switched public switch.
In recent years, the Internet has rapidly come into wide use. The data communication in the Internet is carried out in the form of the IP packet which is obedient to the Internet Protocol (IP) defined in RFC791.
On the other hand, the mobile communication service has also rapidly developed. The mobile communication system has a radio section between a portable terminal and a base station, and a network section which is constituted by accommodation equipment for accommodating therein a base station, a switch, a database for subscriber management, and the like. In the specification of the present application, the network section will hereinafter be referred to as “the ground network”. In the mobile communication system, the data communication traffic has been rapidly increased, and the discussion is actively carried out with respect to the data transfer in accordance with the IP in the ground network of the mobile communication system. At the present time, in the mobile communication, the voice communication in the ground network is carried out in accordance with the line switching system. With respect to the fact that the signal relating to the voice is transferred in the form of the IP packet in accordance with the packet communication system, the discussion is also actively carried out, and the cost merit due to the realization of the IP of the internal network is expected.
As for prior art of disclosing the mobile communication system which is obedient to the packet communication system, there is 3GPP2 (3rd Generation Partnership Project 2) SC.P000X (Citation 1). This mobile communication system is shown in FIG.
1
. In
FIG. 1
, reference numeral
100
designates a mobile terminal which is accommodated in the mobile communication system through a radio channel. Reference numeral
104
designates a base station which is adapted to communicate with the mobile terminal
100
through the radio channel. The base station
101
is connected to an MSC server
102
through a communication channel. The MSC server
102
includes: the function of converting a voice call received from the base station
101
into the IP packet to send the IP packet thus obtained to an IP network
103
; the function of converting the IP packet received from the IP network
103
into the voice call to send the voice call thus obtained to the base station
101
; and the function of communicating with a Home Location Register (HLR)
104
for managing the position information of the mobile terminal to acquire the position information of the mobile terminal. Reference numeral
105
designates a Call Agent (CA) which is connected to the IP network
103
and a Public Switches Telephone Network (PSTN)
107
through communication lines, respectively, and which is adapted to convert the IP packet received from the IP network
103
and a call control signal received from the PSTN
107
into each other to carry out the relay. Reference numeral
106
designates a Media Gateway (MG) for converting the IP packet received from the IP network
103
and the voice signal received from the PSTN
107
into each other to carry out the relay. Also, reference numeral
108
designates a fixed telephone which is connected to the PSTN
107
through the communication line.
In the above-mentioned prior art, the IP packet is transferred through the inside of the mobile communication system, whereby the communication is carried out between the mobile terminal
100
and the fixed telephone
108
. The CA
105
and the MG
106
are provided between the PSTN
107
of the line switching system and the IP network
103
. The CA
105
and the MG
106
are electrically connected to each other by carrying out the signal conversion.
In addition, as for another prior art mobile communication system, there is the mobile communication system which is described in JP-A-2000-278737 (Citation 2) and which is adapted to carry out suitably the switching between the public mode and the private mode in accordance with the position of the portable communication terminal, in particular, the digital cordless telephone terminal which also serves as a PHS. Now, by the public mode is meant the mode in which the information communication is carried out through the base station as the terminal for sending/receipt installed for the public use and which is used when the mobile communication terminal is independently used in the destination of going out. On the other hand, by the private mode is meant the mode in which a specific telephone installed in a home or the like is used as the parent telephone, and the information communication is carried out through this parent telephone and which is used when the child telephone of a specific telephone is used as the mobile communication terminal in a home.
The above-mentioned mobile communication system is shown in FIG.
16
. In
FIG. 16
, reference numeral
1601
designates a digital cordless telephone terminal which also serves as a PHS. Reference numeral
1602
designates a public base station which is adapted to accommodate therein the terminal
1601
having the public mode. Reference numeral
1603
designates a private base station which is adapted to accommodate therein the terminal
1601
having the private mode. Reference numeral
1604
designates a mobile communication system which is connected to the public base station
1602
. Reference numeral
1605
designates a telephone network which is connected to the private base station
1603
. Reference numeral
1606
designates a normal telephone terminal which is connected to the communication system
1605
. Reference numeral
1607
designates position data which is present in the inside of the mobile communication system
1604
and in which the position information of the terminal
1601
is accumulated.
In this communication system, in the system for connecting the arrival-of-the-call using the position data
1607
, when a user of a portable telephone is returning home, at a time point when he/she judges that he/she can communicate with the private base station
1603
in his/her home, he/she sends the request to delete the position information of himself/herself in the position data
1607
in the inside of the mobile communication system
1604
or the request to carry out the redirection of arrival-of-the-call. By carrying out the deletion of the position registration, the useless operation of the arrival-of-the-call is not carried out from the public base station
1602
for the request to carry out the communication from the telephone terminal
1606
to the terminal
1601
. If the redirection of arrival-of-the-call is set, then this redirection is made arrive at the user-desired communication terminal.
In addition, as for a conventional example of the format with which the call control signal of the line switching system which is required for the mobile communication and the IP packet are converted into each other, there is “SS7SCCP-User Adaptation Layer” (Citation 3) as the Internet Draft of the IETF (Internet Engineering Task Force). As described in page 5 of this document, there is proposed the architecture for mapping Transaction Capabilities Application Part (TCAP) as the call control signal of the line switching system required for the mobile communication on the IP packet.
SUMMARY OF THE INVENTION
As described above, it is discussed that in the ground network of the mobile communication system, the line switching network is made proceed to the IP network. The present inventors found out that when making the line switching network proceed to the IP network, the following problem arises. That is, since it takes a lot of time to complete such proceeding, it is conceivable that when carrying out the proceeding, the l
Hirayama Koji
Hoshi Tohru
Hotta Tomohiro
Kitai Katsuyoshi
Osafune Tatsuaki
A. Marquez, Esq. Juan Carlos
Fisher Esq. Stanley P.
Hitachi Ltd
Reed Smith LLP
Ton Dang
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