Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1995-02-15
2000-09-19
Bost, Dwayne D.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455426, 455464, H04Q 720
Patent
active
061225150
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a mobile communication system obtained by improving a cellular type radio communication system.
BACKGROUND ART
For example, a cellular type automobile/portable radio telephone system has been known as one of mobile communication systems.
For example, as shown in FIG. 9, this type of system comprises a control station CS connected via a wired line CL to a stational exchanger EX of a public station network, a plurality of base stations BS1 to BSn connected via wired lines CL1 to CLn to the control station CS, and a plurality of mobile stations MS1 to MSm. The respective base stations BS1 to BSn constitute radio zones E1 to En called cells in different areas within a service area of the system. Different radio channel groups are assigned in advance to the radio zones E1 to En. These radio channel groups are repeatedly assigned to other cell groups located at a sufficient distance, thereby effectively utilizing the radio channels. FIG. 10 shows an example of this structure, and radio channel groups F1 to F13 are assigned to 13 cells constituting each cell group.
Regarding the mobile stations MS1 to MSm, each station is connected to the base station of the radio zone, in which the present station is located, via an unoccupied radio channel of the radio channel group assigned to this radio zone, and the base station is in turn connected to the stational exchanger EX via the control station CS. In this state, a call can be made with a wired telephone connected to the stational exchanger EX or another mobile station. If the mobile station, MS1 to MSm, has moved to another radio zone during a call, the radio channel is switched to a radio channel assigned to the radio zone of the destination of the mobile station and the call is continued. Specifically, as long as the mobile stations MS1 to MSm are present within the service area of the system, a call can be made between each station and another telephone via the base station of the radio zone (cell) where the station is located.
This cellular radio telephone system, however, has the following problem. In the cellular radio telephone system, a mobile station is permitted to make a call anywhere in the service area. Thus, when the user is present, in particular, outdoors, the feature of the system can be exhibited to a maximum. However, the charging rate of the call fee of the cellular radio telephone system is generally higher than that of the public telephone network using wired lines. Accordingly, when the user makes a call in the home or office, it is economical to use a wired subscriber line of the public telephone network, rather than using the cellular radio telephone system. For this purpose, however, the user must deliberately choose between the use of the mobile station of the cellular radio telephone system, i.e. the portable telephone, and the use of the wired telephone installed in the home or office, each time he makes a call. This is very troublesome.
DISCLOSURE OF INVENTION
A first object of the present invention is to provide a mobile communication system capable of performing cellular communication and cordless communication with one mobile unit.
A second object of the present invention is to provide a mobile communication system capable of more effectively utilizing a radio channel assigned to a cellular radio communication system.
A third object of the present invention is to provide a mobile communication system which does not incur an increase in size and weight of a mobile unit, does not cause a considerable increase in cost, and can be realized easily.
In order to achieve the first and second objects, the mobile communication system of the present invention comprises a cellular radio communication system and a fixed unit. In the cellular radio communication system, a predetermined physical area is divided into a plurality of cells, and radio communication is performed between a base unit provided in the cell and a mobile unit moving in the physical area. For this radio communication, the
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Chinese Office Action.
European Search Report.
Ito Koichi
Kuno Jun
Marui Kuniyoshi
Sawa Buntaro
Bost Dwayne D.
Kabushiki Kaisha Toshiba
Maung Nay A.
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