Telecommunications – Radiotelephone system – Special service
Reexamination Certificate
1999-10-14
2003-07-15
Kincaid, Lester G. (Department: 2685)
Telecommunications
Radiotelephone system
Special service
C455S423000, C455S424000, C455S425000, C455S445000
Reexamination Certificate
active
06594485
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a mobile terminal, communication system using the mobile terminal, and a method of re-connecting a line of the mobile terminal in the communication system, and more particularly to such a mobile terminal, communication system, and a method all of which are capable of accomplishing various functions by sharing data stored by terminals with one another through radio signals.
2. Description of the Related Art
In communication system for mobile terminals which system shares data stored in mobile terminals through radio signals to thereby accomplish various functions, such as simplified portable radio telephone system, since state of radio signals through which a mobile terminal makes communication with a radio base station always varies, it is physically impossible to ensure stable communication, and communication may be interrupted at worst. Hence, the above-mentioned conventional communication system attempts to reduce an area which radio signals can scarcely reach, by increasing the number of radio base stations.
In addition, temporary disconnection between a mobile terminal and a radio base station occurs when a mobile terminal passes through an area in which an electric field is locally weak even in a service area, such as intermediate area between buildings and a tunnel in a high-way in an urban area. When a mobile terminal is re-connected after such disconnection has occurred, there is caused a problem that it is not always clear as to which of a mobile terminal and a radio base station should give a call to an opponent, and if both simultaneously attempts to re-connect a line to each other, both cannot be connected to each other.
In order to solve such a problem, Japanese Unexamined Patent Publication No. 5-284091 has suggested communication system in which a mobile terminal is designed to transmit information indicating that the mobile terminal would give a call again immediately after the mobile terminal has passed over an area where an electric field is weakened.
Japanese Unexamined Patent Publication No. 6-315006 has suggested another communication system for mobile terminals. In the suggested communication system, when interruption occurs in radio signals between a mobile terminal and a radio base station, such interruption is informed of an interchange station in mobile network. While the mobile network reserves a call, a mobile terminal or a base station keeps transmitting specific message. When the base station or the mobile terminal receives such specific message, the interchange station in mobile network is informed of such receipt from the base station or the mobile terminal, and then, re-connects a line for the reserved call. Thus, re-connection in a line is carried out immediately after a mobile terminal has passed a blind zone.
However, the above-mentioned conventional communication system which attempts to reduce a blind zone by increasing the number of radio base stations is accompanied with problems that an operator who builds radio base stations has to receive too heavy economic burden, and that stable communication in radio signals cannot always be ensured even if the number of radio base stations is increased, since radio signal condition is varied due to various external factors.
In addition, if abrupt interruption in radio signals occurs, a mobile terminal user usually cannot make further communication after such interruption.
Though the communication system suggested in Japanese Unexamined Patent Publication No. 5-284091 carries out the step of transmitting information indicating that the mobile terminal would give a call again immediately after the mobile terminal has passed over an area where an electric field is weakened, when the mobile terminal dials to an opponent terminal, it is impossible for the mobile terminal to make communication with the opponent terminal unless the mobile terminal passes over the blind zone.
It is also impossible for the communication system suggested in Japanese Unexamined Patent Publication No. 6-315006 to make communication, unless a radio base station or a mobile terminal detects the specific message.
In addition, it is impossible for the communication systems suggested in the above-mentioned Publications to make communication, unless a line in radio signals between a radio base station and a mobile terminal returns into normal condition.
Japanese Unexamined Patent Publication No. 6-78075 has suggested communication system to be mounted in an automobile. In the suggested communication system, if a key-lock signal is transmitted while an operation section is being handled, a control section transmits a reservation requesting signal to a data center, and interrupts telephone lines. State just before interruption of the telephone lines is stored in both a storage section of the system and a storage section in the data center. The control section transmits a reservation releasing signal to the data center for re-connection of the telephone lines after transmission of the key-lock signal has been stopped. Then, a menu screen of the state detected just before interruption of the telephone lines is displayed, based on data stored in the storage sections. The data center is transferred into a state detected just before interruption of the telephone lines. In accordance with the communication system, it is no longer necessary to re-start the operation for selection.
Japanese Unexamined Patent Publication No. 8-307949 has suggested communication system for re-connecting mobile terminals. When a user of a calling terminal or a called terminal interrupts connection in a line, communication is ceased. If communication is ceased without interruption being made by a user, the calling terminal gives a call again to the called terminal without a ringer of the called terminal being rung. The called terminal automatically responds to the calling terminal, even if a user of the called terminal carries out a step necessary for responding to a call, thereby a line between the terminals is connected again.
Japanese Unexamined Patent Publication No. 9-261154 has suggested radio signal communication system. In the suggested communication system, a mobile terminal can make communication with a first base station in a first radio signal zone through a first line having a narrow band, and further can make communication with second and third base stations in second and third radio signal zones through a second line having a wide band. Audio data is transmitted through the first line, and graphic data is transmitted through the second line. Both the audio and graphic data is provided with time stamp for establishing synchronization between audio and graphic data. When the second line is interrupted, the graphic data is ceased to transmit. When the second line is recovered, a location at which the graphic data starts to be transmitted is determined by virtue of the time stamp of the audio data having been received in the first line at the time of recovery of the second line. Thereafter, the graphic data is transmitted through the second line.
The above-mentioned problems remain unsolved even in the communication systems suggested in the above-mentioned Publications
SUMMARY OF THE INVENTION
In view of the above-mentioned problems, it is an object of the present invention to provide a mobile terminal, communication system using the same, and a method of re-connecting the mobile terminal, all of which are capable of ensuring communication for a user of a mobile terminal even when a line between a mobile terminal and a radio base station is abruptly interrupted and the line does not return to normal state.
In one aspect of the present invention, there is provided a communication system for mobile terminals, including (a) a first mobile terminal, (b) a first radio base station to which the first mobile terminal is connected through radio signals, (c) a second terminal, and (d) a control station through which the first radio base station is connected to the second terminal,
Kincaid Lester G.
Scully Scott Murphy & Presser
Ward Ronald J.
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