Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
1998-04-14
2001-04-03
Eisenzopf, Reinhard (Department: 2682)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S444000, C455S437000
Reexamination Certificate
active
06212381
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a mobile telephone capable of calling using two different calling systems such as a personal digital cellular system (PDC) employed in a cellular phone and a personal handyphone system (PHS) in a cordless telephone.
Description of the Related Art
Conventional mobile telephones have been widely used as information terminals capable of talking during moving. In such mobile telephones, two different calling systems, the personal digital cellular system (PDC) (called “a large scale cell system” hereinafter) used in a cellular phone and the personal handyphone system (PHS) (called “a small scale cell system” hereinafter) employed in a cordless phone have been widely used.
In the PDC, a user can talk during a high speed moving. However, a large consumption current is required and a calling charge is high. In the PHS, a telephone call cannot be done during a high speed moving. But, a consumption current is small and a calling charge is small. These two different systems have both merits and demerits.
In practice, when a telephone is connected in the PHS, as often occurring in moving by an automobile, while a high speed moving and a low speed moving are repeated, a user can talk when the automobile moves at a low speed, for example, waiting at a traffic signal. However, when the automobile moves again and the telephone is suddenly disconnected at a hand-off disabling speed. Such a trouble takes place on a train moving again after stopping at a station in the same manner.
In the PHS, during the telephone call, the call can be disconnected as the terminal moves at the hand-off disabling speed. In order to prevent this trouble, the PDC can be used. However, as described above, the PDC requires the large consumption current and the high calling charge, and the full time use is expected to be avoided.
In order to solve this problem, other mobile telephones capable of using the PDC and the PHS have been proposed. In these mobile telephones, the two calling systems can be switched depending on the using situation so as to make the best use of both the merits.
One mobile telephone of this kind is disclosed in Japanese Patent Laid-Open Publication No. 6-224828, as entitled “Micro Cell/Macro Cell Integrated Mobile Communication System”, Akira YAMAGUCHI et al. In this telephone in which a plurality of calling systems are integrated in one terminal, a moving speed of the terminal is estimated from a receiving level change, and the systems are switched depending on the moving speed even during the talking, with the result of applying both the merits.
Another mobile telephone of this kind is disclosed in Japanese Patent Laid-Open Publication No. 59-15573, as entitled “Telephone To Be Mounted To Mobile Body,” Akiho SASAKI et al. In this telephone, a moving speed of a terminal is detected, and the calling systems are switched on the basis of the moving speed, utilizing both the merits.
In the first conventional telephone, it is necessary to measure the receiving levels of a plurality of radio control channels transmitted from base stations and their change with the elapse of time. However, now, there is no hope of realizing the hand-off between the two different systems such as the PDC and the PHS of different enterprising parties. In this case, the moving speed can not be measured. Moreover, the receiving level varies largely depending on states of propagation paths, and the precise moving speed of the terminal cannot be estimated.
In the second conventional telephone, a method of linking the motion between a speedometer of a mobile body and a terminal is proposed in order to detect the moving speed of the terminal. However, in this method, when the terminal is used on a train or the like, the detection of the moving speed cannot be carried out.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a mobile telephone in view of the aforementioned problems of the prior art, which is capable of improving reliability of line connection during moving, further improving using efficiency of the mobile telephone, and carrying out a more precise detection of a moving speed of the mobile telephone.
In accordance with one aspect of the present invention, there is provided a mobile telephone capable of calling using a first calling system of being hand-off disabling at a speed more than a predetermined moving speed of the mobile telephone and a second calling system of being hand-off enabling irrespective of the predetermined moving speed, comprising speed detecting means for detecting the moving speed of the mobile telephone itself; storing means for storing the moving speed detected by the speed detecting means for a past predetermined time; and calling control means for controlling the calling using the first and second calling systems on the basis of the moving speed for the past predetermined time, which is stored in the storing means.
According to the present invention, the detected moving speed of the mobile telephone itself in the predetermined time interval from the past time to the present time is once stored, and the calling system is controlled on the basis of the stored moving speed. As a result, the using efficiency of the mobile telephone can be improved and the reliability of the line connection can be improved in comparison with a conventional mobile telephone in which the calling system is controlled depending on only the present moving speed of the mobile telephone.
A mobile telephone, preferably, further comprises time setting means for setting the predetermined time by a user; and a timer for counting the predetermined time.
The user can set the predetermined time interval and the predetermined limit speed, and these values can be changed depending on the using situation of the mobile telephone, whereby the using efficiency of the telephone can be further improved.
A mobile telephone can further comprises a gyro for changing an output voltage depending on an acceleration given to the mobile telephone, and the speed detecting means detects the moving speed on the basis of the voltage output from the gyro.
The gyro detects the acceleration of the mobile telephone in order to detect the moving speed of the telephone, and the more precise detection of the moving speed of the telephone can be carried out.
In another mobile telephone of the present invention, the storing means discriminates whether or not the moving speed for the past predetermined time is more than the predetermined moving speed, and, when the moving speed for the past predetermined time is more than the predetermined moving speed, the calling control means prevents the calling by the first calling system.
Hence, when the moving speed of the mobile telephone in the past predetermined time interval is beyond the predetermined speed, the calling by the hand-off disabling system is prevented. At calling, even when the moving of the mobile telephone itself is stopped and is reduced below the predetermined speed and the calling by the hand-off disabling system is selected, such a calling by the hand-off disabling system cannot be permitted so as to foresee the possibility that the moving speed of the telephone rises thereafter beyond the predetermined speed. Thus, the using efficiency of the mobile telephone can be further improved.
In a mobile telephone, more preferably, the first calling system is a personal handyphone system, and the second calling system is a personal digital cellular system.
In the mobile telephone of the present invention, the calling is carried out using both the PHS which is small in consumption power and small in calling charge although the calling cannot be done during the high speed moving, and the PDC which makes the calling possible during the high speed moving but which is large in consumption power and high in calling charge. As a result, the using efficiency of the telephone can be further improved.
REFERENCES:
patent: 5548806 (1996-08-01), Yamaguchi et al.
patent: 5711004 (1998-01-01), Blasiak et al.
pat
Eisenzopf Reinhard
NEC Corporation
Nguyen Duc
Scully Scott Murphy & Presser
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