Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Utility Patent
1998-07-09
2001-01-02
Tsang, Fan (Department: 2645)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S063300, C455S423000
Utility Patent
active
06169909
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a mobile communication system and, more particularly, to a mobile communication system in which re-connection is performed when radio wave interruption occurs during non-speech data communication.
A mobile communication system has been proposed (for example, Japanese Patent Laid-Open No. 6-315006), in which when a mobile station moves into a dead zone, and radio wave interruption occurs between the mobile station and the base station, the switching center holds the call on the network side, and the mobile station or the base station keeps transmitting a predetermined message during the radio wave interruption. Upon detection of this message, the base station or the mobile station cancels the call holding in the switching center, and re-connects the call.
In addition, the following system has been proposed (for example, Japanese Patent Laid-Open No. 7-177576). When the strength of the electric field generated by the mobile station temporarily decreases, the network holds communication with a remote terminal, and notifies the remote terminal that the communication is held because of the decrease in electric field strength, as needed.
Upon detection of a communication resume instruction from the mobile station after restoration of the electric field strength, the network cancels the holding and resumes the communication. If no communication resume instruction from the mobile station is detected within a predetermined period of time after the holding, the network notifies the remote terminal that the communication is interrupted because no communication resume instruction is obtained, thereby interrupting the channel.
In such conventional mobile communication systems, re-connection is to be performed when radio wave interruption occurs during speech communication, but no consideration is given to radio wave interruption during communication of non-speech data, i.e., digital information. These re-connection methods cannot therefore be applied to re-connection processing for non-speech data communication without any modification.
This is because, when non-speech data communication is to be performed, an adaptor (ADP) placed on the mobile station side and an interworking function (IWF) placed on the switching center side are required as devices for non-speech data communication in addition to the constituent elements used for speech communication.
When speech communication is to be resumed, it suffices if the users resume speech communication. Assume that non-speech data communication is to be resumed upon occurrence of call disconnection during communication. In this case, when the system has logged in to a remote system to execute a program remotely, in particular, the system must log in to the remote system again to re-execute the program. This requires many re-connection steps as compared with the case of speech communication.
SUMMARY OF THE INVENTION
The present invention has been made to solve a this problem, and has as its object to provide a mobile communication system which can prevent communication interruption even if a radio wave condition deteriorates during non-speech data communication, and can resume the communication in accordance with restoration of the radio wave condition.
A mobile communication system for performing non-speech data communication through a radio zone between a mobile station and a base station, comprising a terminal for transmitting/receiving non-speech data, a mobile station accommodated in a base station through a radio zone, and an adaptor arranged between the terminal and the mobile station to convert non-speech data to be transmitted/received to/from the terminal and a predetermined frame to be used in the radio zone through the mobile station, and perform error control in units of frames, wherein the mobile station outputs a holding instruction to the adaptor in accordance with radio wave interruption in the radio zone, and outputs a holding cancel instruction to the adaptor in accordance with radio wave restoration, and the adaptor instructs the terminal to pause non-speech data transmission/reception in accordance with the holding instruction from the mobile station, pauses frame transmission/reception to/from the mobile station, instructs the terminal to resume non-speech data transmission/reception in accordance with the holding cancel instruction from the mobile station, and resumes frame transmission/reception to/from the mobile station.
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Jackson Blane J.
McGuireWoods LLP
NEC Corporation
Tsang Fan
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