Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
1999-02-09
2001-08-14
Bost, Dwayne (Department: 2681)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S553100, C370S331000
Reexamination Certificate
active
06275702
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a method for operating a mobile phone device. Particularly, for operating in an environment that has a dynamism with respect to an actual call that comprises transmitting digital information between the device in question and a superior station, which dynamism should mandate in the mobile phone device a mode alteration of the transmitting.
2. Description of the Related Art
Present-day mobile phones are being used for transporting voice as well as digital data, and for transmitting as well as for receiving. In AMPS/NAMPS and TACS/ETACS networks a base station may request a mobile station to tune to another channel. Such other channel may become more preferable than the present one due to various dynamisms, such as a changing distance between the device and the original base station, atmospheric or other interferences, or through still further causes. In practice, when such change occurs during a fax or data call, transmission failures can readily occur that may result in loosing a part of the digital data contained in the fax or data call. It has been proposed to take measures for repairing erroneous or missing data on a relatively high level in the communication, but such will often remain unsatisfactory.
From a call processing point of view, the procedure to establish a call for digital transfer is exactly the same as for a normal voice call; in fact, it would be feasible to have a call that were part voice, part digital. This situation is similar from the point of view of a base station, that does not know whether a mobile station will use a call for voice or rather for data. At present, it appears to be common procedure for effecting data transfer while stopping a motor car that has the portable telephone device on board, which would diminish the dynamism. The invention however, should provides an ultimate block against data losses due to changeover to a different base station.
SUMMARY OF THE INVENTION
In consequence, amongst other things, it is an object of the invention to take simple measures for mitigating the effects of the recited dynamism to a great extent. Now therefore, according to one of its aspects the invention provides detecting of the mechanism during the actual transmitting and thereupon selectively and transiently blocking the alteration for at least a predetermined time interval. The changing of mode may pertain to searching for another base station, for another frequency on the same station, or for another change of operation parameters.
The invention also relates to a mobile phone device that is arranged for practising the method. Further advantageous aspects of the invention are recited in dependent claims.
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Bost Dwayne
Gelin Jean A
U.S. Philips Corporation
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