Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
2000-05-24
2004-08-10
Trost, William (Department: 2683)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S445000, C455S550100, C455S553100, C455S555000, C455S426200
Reexamination Certificate
active
06775556
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a device and a method for processing a call between a private exchange network and a mobile communication network, and more particularly, to a device and a method for processing a call between a private exchange network and a mobile communication network in which a public communication network is not used.
2. Background of the Related Art
In general, a private branch exchange in a private exchange network serves to establish a communication path through a main line or a private line according to an instruction from an extension subscriber. The private branch exchange makes a communication between both parties available, or detects a call signal from a wired exchange in the public communication network and establishes a communication path with the extension subscriber to make a communication available, and, cuts off the communication path upon completion of the communication so that the extension subscriber is ready for the next communication. A mobile communication service in the mobile communication network serves to divide an entire service area into a plurality of base stations for forming cells with a small sized service area, and controls the base stations using a mobile exchange so that a subscriber of the mobile communication network can establish a communication path with another subscriber of the mobile communication network or can establish a communication path through wire exchange in the public communication network, for making a communication available.
As shown in
FIG. 1
, a related art communication network includes the above described private exchange network and the mobile communication network interfacing at the public communication network
13
. When an extension subscriber
11
connected to a private branch exchange
12
in a private exchange network intends to make communication with a mobile subscriber
16
registered on a mobile communication network
14
, a call is processed through the public communication network
13
for providing the required communication service, which will be described with reference to FIG.
2
A.
As shown in
FIG. 2A
, when the extension subscriber
11
in the private branch exchange
12
dials a destination telephone number with which the extension subscriber intends to communicate, the private branch exchange
12
analyzes numerals of the destination telephone number to verify the destination telephone number is a communication request for the private exchange network or the mobile communication network. That is, the dialed destination telephone number is determined to start with an area code or a mobile telephone call number, and if the dialed destination telephone number is neither the area code nor the mobile telephone call number, existence of a prefix is checked. If the dialed destination telephone number starts with either the area code or with the prefix without the area code, it is determined that the dialed destination telephone number is a request for communication to the public communication network
13
, If the dialed destination telephone number starts with the mobile telephone call number, it is determined that the dialed destination telephone number is a request for communication to the mobile communication network
14
. If the dialed destination telephone number has only an extension number without the area code, the mobile telephone call number, or the prefix, it is determined that the dialed destination telephone number is a communication request for another extension subscriber to a private exchange network.
According to the determination, if the dialed destination telephone number is a request for the private exchange network, the private branch exchange
12
calls a pertinent extension subscriber
11
and provides a communication service between the extension subscribers
11
. If the analysis of the dialed destination telephone number reveals that the dialed destination telephone number is not a communication request for the private exchange network, the private branch exchange
12
transmits the dialed destination telephone number through a main trunk connected to a wire exchange (not shown) within the public communication network
13
. Then, the wire exchange analyzes the dialed destination telephone number using the same method to verify the dialed destination telephone number is the communication request for the public communication network
13
or the mobile communication network
14
. According to the wire exchange determination, if the dialed destination telephone number is a request for the public communication network
13
, a pertinent wire subscriber is called to provide the communication service between the extension subscriber
11
in the private exchange network and the wire subscriber in the public communication network
13
.
If the analysis of the dialed destination telephone number in the wire exchange reveals that the dialed destination telephone number is a communication request for the mobile communication network
14
, the wire exchange in the public communication network
13
makes connection with the mobile exchange (not shown) in the mobile communication network
14
for transmitting the dialed destination telephone number. Then, after the mobile exchange analyzes the transmitted destination telephone number, and confirms on a registered position of a mobile subscriber with whom the communication is requested (i.e., the mobile station of the mobile subscriber
16
of the destination telephone number that the extension subscriber
11
in the private exchange network dialed), the mobile exchange calls the mobile subscriber
16
through a base station controlling the position at which the mobile station is registered. When the mobile subscriber
16
responds to the call, a response signal of the mobile subscriber
16
is generated by the mobile exchange in the mobile communication network
14
, and transmitted to the private branch exchange
12
in the private exchange network through the wire exchange in the public communication network
13
. According to this, a communication path is opened between the extension subscriber
11
in the private exchange network and the mobile subscriber
16
in the mobile communication network
14
for making a communication service available.
Opposite to this, when the mobile subscriber
16
registered on the mobile exchange in the mobile communication network
14
intends to make a communication with the extension subscriber
11
connected to the private branch exchange
12
in the private exchange network, a call is processed through the public communication network
13
, which will be described with reference to FIG.
2
B. When the mobile subscriber
16
in the mobile exchange dials a destination telephone number, the mobile exchange (not shown) in the mobile communication network
14
analyzes the dialed destination telephone number to determine whether the dialed destination telephone number is a communication request for the mobile communication network
14
(i.e., starts with a mobile telephone call number). If the dialed destination telephone number is a communication request for the mobile communication network
14
, a pertinent mobile subscriber
16
in the mobile exchange is called to provide the communication service between the mobile subscribers
16
. If the analysis of the destination telephone number reveals that the destination telephone number is not a communication request for the mobile communication network
14
, the mobile exchange makes connection to a wire exchange in the public communication network
13
and transfers the dialed destination telephone number thereto.
Then, the wire exchange in the public communication network
13
determines whether the received destination telephone number is a communication request for the public communication network
13
or for the private exchange network. If the received destination telephone number is a communication request for the public communication network
13
, the wire exchange calls a pertinen
Ghoi Gi Moo
Hong Pill O
Kang Hwan Jong
Fleshner & Kim LLP
LG Information & Communications Ltd.
Trost William
Zewdu Meless
LandOfFree
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