Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2002-04-24
2004-09-28
Trost, William (Department: 2683)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S432300, C455S436000, C455S440000, C455S551000
Reexamination Certificate
active
06799036
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a communication controller, a base station controller and a communication system, and more particularly, to a communication controller that performs a connection control of roaming when a subscriber terminal moves from the home area to another area and a communication controller that performs a connection control of a subscriber terminal located in the home area or roaming area. The present invention is also concerned with a base station controller that performs a connection control of a roaming when the subscriber terminal moves from the home area to another area. Further, the present invention relates to a communication system that performs a connection control of roaming when the subscriber terminal moves from the home area to another area in WLL (Wireless Local Loop).
2. Description of the Related Art
Recently, attention has been drawn to a WLL system in which subscriber lines are implemented by wireless channels in the access system from a switch to subscriber terminals. Generally, the wireless system is utilized in an isolated island, desert or mountainous area with difficulty in laying cables. However, recently, the wireless system has been increasingly utilized in urban areas because it may reduce the construction period and cost.
FIG. 12
is a diagram of a basic structure of the WLL system. The WLL system is made up of a local exchange
40
in a public network
400
, base station controllers (BSC)
101
and
102
, base transceiver stations (BTS)
201
and
202
, and subscriber terminals
301
-
303
.
The subscriber terminal
301
includes a stationary telephone set
301
b
and a subscriber unit
301
a
connected thereto and involved in wireless communication. The subscriber terminals
302
and
303
have the same structure as described above.
The exchange
40
is connected to the BSCs
101
and
102
. The BSC
101
is connected to the BTS
201
, which is connected to the subscriber terminals
301
and
302
via radio channels. The BSC
102
is connected to the BTS
202
, which is connected to the subscriber terminal
303
via a radio channel.
The BSC
101
, BTS
201
, and the subscriber terminals
301
and
302
are located in an area E
10
, and the BSC
102
, BTS
202
, and subscriber terminal
303
are located in an area E
20
.
The BSCs
101
and
102
accommodate a plurality of wireless base stations, and communicates with the exchange
40
in protocol exchange processing. The BTSs
201
and
202
communicate with the subscriber terminals
301
-
303
on the air using radio waves (wireless channels).
The interface between the exchange
40
and the BSCs
101
and
102
is, for example, V5.2 that is the ETS (European Telecommunication Standard)
300
,
347
. The air interface between the BTSs
201
and
202
and the subscriber terminals
301
-
303
is, for example, a connection making system that conforms to CDMA or PHS.
However, the conventional WLL system described above is on the condition that the stationary telephone sets are used even when the subscriber channels are wireless. Thus, for example, in a case where the user initially contracts a communication service in the area E
10
(home area), when the user moves to another area E
20
(roaming area) out of contract due to relocation, the user cannot receive the communication service.
In that case, it is necessary to rewrite subscriber data managed in the exchange
40
and the BSC
102
and to rewrite the telephone number in order to enable the user to receive the communication service in the area E
20
. As described above, the conventional WLL system does not consider connection control of roaming and takes a lot of trouble in rewriting. Thus, the conventional WLL system does not have good convenience.
When the subscriber terminal is used close to the boundary, the conventional WLL system allows the user to be connected to only the registered area although the user should be originally connected to the area in which the better radio condition for communication is available.
SUMMARY OF THE INVENTION
Taking the above into consideration, it is an object of the present invention to provide a communication controller that employs a connection control of roaming in WLL and provides communication services by efficiently making a connection even when the subscriber changes the area.
Another object of the present invention is to provide a base station controller that employs a connection control of roaming in WLL and provides communication services by efficiently making a connection even when the subscriber changes the area.
A further object of the present invention is to provide a communication system that employs a connection control of roaming in WLL and provides communication services by efficiently making a connection even when the subscriber changes the area.
The above objects of the present invention are achieved by a communication controller performing a connection control of roaming in which a subscriber terminal moves from a home area to a roaming area, said communication controller comprising: identification number management unit which manages a home area identification number assigned to the subscriber terminal in the home area and a roaming area identification number assigned thereto in the roaming area; and call connection processing unit which translates the home area identification number and the roaming area identification number into each other for call connection processing.
The above and other objects, features and advantages of the present invention will become apparent from the following description when taken in conjunction with the accompanying drawings which illustrate preferred embodiments of the present invention by way of example.
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patent: 5588042 (1996-12-01), Comer
patent: 5610919 (1997-03-01), Willard et al.
patent: 5854980 (1998-12-01), Takahashi et al.
patent: 6006107 (1999-12-01), Tomioke et al.
patent: 6047179 (2000-04-01), Kirby
patent: 6073029 (2000-06-01), Smith et al.
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Doi Ayano
Kubo Tsudoi
Fujitsu Limited
Katten Muchin Zavis & Rosenman
Trost William
Zewdu Meless
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