Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
1998-10-21
2002-02-19
Le, Thanh Cong (Department: 2684)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S428000, C455S466000, C455S556200, C455S557000, C455S567000
Reexamination Certificate
active
06349224
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for making a mobile-to-mobile wireless data communication, and more particularly, to a method for making a mobile-to-mobile wireless data communication in PCS(Personal Communication Services)/digital cellular mobile telecommunication system.
2. Background of the Related Art
Data communication between a mobile data terminal having a mobile terminal, such as a mobile phone and a data terminal such as a mini-computer connected together, and a wire data communication network, such as a PSTN(Public Switched Telephone Network), has been done using IWU (Interworking Unit). And, data communication between the mobile data terminals within a wireless mobile communication network is also done using the IWU. The IWU interconnects various independent communication networks to extend an overall communication range, for providing services that can not be provided by the independent networks. That is, the IWU serves to match protocols between wire data communication networks such as PSTN's and/or wireless data terminals connected to the wire data communication networks. For example, the IWU allows an E-mail or internet by means of a mobile terminal such as a mobile phone connected to a portable mini-computer, or communication between an acoustic coupled terminal connected to a mobile phone and a computer in a packet switching network.
FIG. 1
illustrates a configuration of a related art wire/wireless data communication network including an IWU.
Referring to
FIG. 1
, the related art wire/wireless data communication network is provided with a plurality of mobile data terminals (or mobile hosts)
11
(
11
A-
11
D) each having a mobile terminal MT
1
or MT
2
connected to a data terminal TE
1
or TE
2
, such as a lap top, a palm top, or a minicomputer, a plurality of BTS's (Base Stations)
12
a
-
12
d
for relaying communication between the mobile data terminals
11
, a plurality of BSC's (Base Station Controllers)
13
a
and
13
b
for controlling an overall management of the BTS's
12
a
-
12
d
, a wireless data communication network
10
having a plurality of MSC's (Mobile Switching Centers)
14
for providing a contact point of a user traffic in making a communication between two mobile data terminals in mobile communication networks of its own or other than its own, a wire data communication network
20
having a plurality of wire data terminals such as computers each with a wire telephone
23
connected thereto through a modem
22
, an internet network
30
, a personal data network
40
, and an IWU
50
for interconnecting the networks
10
,
20
,
30
, and
40
.
A related art method for making a data communication between a mobile data terminal
11
c
wireless connected to a wireless data communication network
10
and a wire data terminal(the computer
21
connected with the wire telephone
23
connected to the wire data communication network
20
will be explained with reference to
FIGS. 3-4
.
FIG. 2
illustrate an architecture showing a circuit data service communication protocol in a mobile communication system given in IS-99 and IS-707 recommendations. What is shown in
FIG. 2
is a communication protocol only on a transmission side with reference to the IWU, while omitting a receiver side as the receiver side communication protocol architecture is symmetry with respect to the IWU. This communication protocol architecture is mostly used in a wireless circuit data service. First, under a condition that one mobile data terminal
11
c
is provided by connecting a transmission side data terminal TE
2
and a mobile terminal MT
2
both in the wireless data communication network
10
, a user makes a communication with an AI (application interface) layer in the mobile terminal MT
2
using an AT instruction word through a screen given on a data terminal TE
2
, to set up a data communication mode of the mobile data terminal
10
c
and communication parameters. Then, the user calls a wire data terminal (or a wire host) in the wire data communication network
20
using an ATD originating instruction word. When the user of the mobile data terminal
11
c
called a counter part using the ATD originating instruction word, the originating function of the mobile terminal MT
2
demands a call connection to the mobile switching center
14
b
through pertinent base station
12
c
inclusive of a data service option n required from the CAI layer in the mobile terminal MT
2
. Then, detecting the data service option n, the mobile switching center
14
b
sets up a RLP (Radio Link Protocol) for use in data link of the mobile terminal MT
2
between the mobile terminal MT
2
and the base station
12
c
for execution of the call from the mobile data terminal
11
c
. The mobile switching center
14
b
connects the data terminal TE
2
to the IWU
50
through a mobile data path and a signalling path shown in FIG.
3
. Once the data path between the mobile terminal MT
2
and the IWU
50
is established, a data communication protocol layer is set up between the mobile terminal MT
2
and the IWU
50
. Accordingly, the AI layers of the mobile terminal MT
2
and the IWU
50
are connected to each other to process the AID originating instruction word the user applied to the data terminal TE
2
in the AI layer of the IWU
50
, so that the IWU
50
calls the wire data terminal
21
connected to the PSTN through the signalling path. Then, the modem
22
connected to the IWU
50
is activated to connected a circuit to a modem of the counterpart through a PSTN path, opening a communication between the wireless data terminal TE
2
and the data terminal
21
in the wire data communication network
20
and allowing a communication between both parties. On the other hand, in a case of data reception, when the wire data communication network
20
calls the mobile data terminal
11
a
-
11
d
with a subscriber identification number of the mobile terminal MT
1
or MT
2
, the mobile switching center
14
b
calls the mobile terminal MT
2
through the base station
12
a
-
12
d
. When the mobile terminal MT
2
gives a response in the data service option n, the mobile switching center
14
b
connects the IWU
50
to a relay layer for the mobile data path and the wire data communication network
20
is connected to the IWU
50
. In this instance, the base station
12
activates the RLP layer of the mobile terminal MT
2
for making a both way communication of the mobile data terminal
11
c
and data terminal connected to the wire data network
20
the same as the case of calling signal.
However, this related art is developed mainly aimed for data communications between a data terminal and a data terminal in a wire network. Accordingly, the aforementioned related art has been applied even to a wireless data communication between data terminals. That is, in order to conduct a wireless communication between data terminals using communication standards such as IS-99 or IS-707, the IWU should set up a call for a reception terminal because a communication protocol with the IWU should be used. In this instance, one more modem in the IWU should be occupied and an additional path from the IWU to the mobile switching center should be used.
SUMMARY OF THE INVENTION
Accordingly, the present invention is directed to a method for making a mobile-to-mobile wireless data communication in PCS (Personal Communication Services)/digital cellular mobile telecommunication system that substantially obviates 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 method for making a mobile-to-mobile wireless data communication in PCS (Personal Communication Services)/digital cellular mobile telecommunication system which allows a direct communication without occupying an IWU.
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 in
Cong Le Thanh
Fleshner & Kim LLP
LG Information & Communications Ltd.
Woldetatios Yemane
LandOfFree
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