Multiplex communications – Communication techniques for information carried in plural... – Assembly or disassembly of messages having address headers
Reexamination Certificate
1998-12-30
2003-04-15
Ton, Dang (Department: 2661)
Multiplex communications
Communication techniques for information carried in plural...
Assembly or disassembly of messages having address headers
C370S320000, C370S356000, C370S398000, C455S428000, C375S222000, C379S220010
Reexamination Certificate
active
06549543
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a data communication system and data communication operating method. In particular, the present invention relates to a data communication system and data communication operating method which can provide a data communication service by selectively routing to a public switching telephone network (PSTN), X.25 network, and Internet by extensively applying a packet assembler deassembler (PAD) function to an interworking function device provided in a code division multiple access (CDMA) type data communication system.
2. Description of the Related Art
Generally, the network structure of an asynchronous circuit data service (service option
4
,
12
) using the CDMA system recommended by TIA/EIA/IS-99/657/658 is illustrated in FIG.
1
.
Referring to
FIG. 1
, a user of a mobile station requests the asynchronous circuit data service using an AT command. At this time, a mobile phone
2
combined with a data terminal
1
which can be selected among a notebook, personal digital assistant (PDA), laptop, palmtop, portable computer, compact computer, etc., may be used as the mobile station. According to the present invention, it is assumed that the data terminal is the notebook. As is well known, the mobile phone, i.e., the mobile terminal
2
seizes a base transmission station (BTS)
3
, and is connected to a mobile switching center (MSC)
5
through a base station controller (BSC)
4
.
A mobile subscriber processing section
51
in the mobile switching center
5
then analyzes the service option when it receives a call connection request from the mobile terminal
2
. At this time, the service option may be classified in accordance with connection/disconnection of the data terminal
1
and the mobile terminal
2
and the inputted AT command. If the user requests the asynchronous circuit data service, a mobile data path is determined from a mobile data path processing section
52
of the mobile switching center
5
to a mobile data path processing section
61
of an interworking function device (IWF)
6
as a communication path. Thereafter, the mobile terminal
2
and a protocol processing section
62
of the interworking function device
6
determine a point-to-point protocol (PPP) and TCP/IP through the determined mobile data path. If the TCP/IP is determined, the mobile terminal
2
transmits the AT command, which has been recognized or has not been recognized, to an IS-99 protocol processing section
63
of the interworking function device
6
.
The IS-99 protocol processing section
63
of the interworking function device
6
seizes a modem, and processes the contents recommended by the EIA/TIA/IS-99 with respect to the AT command.
Especially with respect to an ATD command, the IS-99 protocol processing section
63
analyzes a next command following the ATD command, extracts a terminating number, and then connects a call to the public switching telephone network path processing section
65
of the interworking function device
6
. The public switching telephone network path processing section
65
requests the call to a public switching telephone network path processing section
54
of the mobile switching center
5
by using the terminating number extracted from the IS-99 protocol processing section
63
. The public switching telephone network path processing section
54
of the mobile switching center
5
detects whether the terminating number corresponds to the terminating call to the mobile subscriber or the terminating call to the public switching telephone network by analyzing the terminating number. In case of the terminating call to the public switching telephone network
10
, the public switching telephone network path processing section
54
connects the call to a wired terminal connected to the public switching telephone network
10
of the mobile switching center
5
through a trunk processing section
53
of the mobile switching center
5
. However, in case of the terminating call to the mobile subscriber, the public switching telephone network path processing section
54
searches location information of the subscriber by communicating with a home location register (HLR) or a visitor location register (VLR). At this time, if the terminating call is the call for the subscriber of the intra mobile switching center as the result of search, the public switching telephone network path processing section
54
connects the call to the interworking function device
6
through the public switching telephone network path processing section
54
of the mobile switching center, while if the terminating call is the call for the subscriber of the inter mobile switching center, it connects the call to another mobile switching center through the trunk processing section
53
.
However, according to the conventional network structure, only the calls with the public switching telephone network
10
can be processed in case of the asynchronous circuit data service (service option
4
,
12
). Accordingly, in the CDMA type data communication system, the data communication service with the X.25 network and Internet, which are generally used, cannot be provided by the asynchronous circuit data service option.
Further, the user should necessarily input the terminating number in order to receive the CDMA asynchronous circuit data service, and should remember the IP server connection numbers in order to connect with the IP servers of the public switching telephone network
10
, using the asynchronous circuit data service.
Furthermore, in order for the user to process the terminating call to the public switching telephone network
10
, a waiting time which is longer than that in the wired network is required for identifying the connection state with a wired terminal connected to the public switching telephone network. Specifically, the connection time between the mobile station and the mobile switching center
5
, and the protocol negotiation time between the protocol processing section
62
of the interworking function device
6
and the mobile terminal
2
are required. The negotiation time may be varied according to the radio environment, and may be about 4 to 10 seconds. Also, the negotiation time between the modem
64
of the interworking function device
6
and the modem
7
connected to the public switching telephone network
10
may be about 7 to 10 seconds.
SUMMARY OF THE INVENTION
Accordingly, the present invention is directed to a data communication system and data communication operating method that substantially obviate one or more of the problems due to limitations and disadvantages of.the related art.
An object of the present invention is to provide a data communication system and data communication operating method which can provide data communication service to a public switching telephone network, X.25 network, and Internet by extensively applying a packet assembler deassembler (PAD) function to an interworking function device of a CDMA type data communication system.
It is another object of the present invention to provide a data communication system and data communication operating method which can receive an asynchronous circuit data service without inputting a terminating number, and which can connect with an IP server of a public switching telephone network using an asynchronous circuit data service without the necessity of remembering an IP server connection number.
It is still another object of the present invention to provide a data communication system and data communication operating method which can provide a waiting time faster than that in a wired network in case of identifying the connection state with a wired terminal connected to a public switching telephone network.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly point
Fleshner & Kim LLP
LG Information & Communications Ltd.
Phan Tri H.
Ton Dang
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