The cellular telephone data communication system and method involves the use of a mobile data processing interface and a cooperating static data processing interface to effectively transmit data over a cellular telephone system. Each data processing interface includes a processor which operates in the transmitting mode to add an error control correction data format to data received from an external data source. The data is divided into packets and provided to a modem which is uniquely operated to eliminate the action of the modem scramble system and to remain active in spite of a carrier signal loss. The modem is deactivated or disconnected by a disconnect signal from the processor, and when carrier signal loss occurs, this disconnect signal is provided only after the lapse of a delay period without the resumption of the carrier signal. The error control correction data format causes a receiver to evaluate the received data for error and to retransmit an acknowledgment signal for each acceptable packet of received data. In the absence of an acknowledgment signal, the processor will again provide a data packet to the modem for retransmission. Also, the processor will determine the frequency of error in the received data from the acknowledgment signals and subsequently adjust the data packet size in accordance with this error frequency.
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1. A method for transmitting data from a transmitting station over a cellular telephone system to a receiving station by means of a modem connected to said cellular telephone system which is operative in an activated state to modulate a carrier signal for said cellular telephone system with a data signal, said method including the steps of placing said modem in the activated state, providing a data signal to said activated modem, maintaining said modem in the activated state for a predetermined time period after a loss of said carrier signal before permitting said modem to deactivate, and causing said modem to remain in said activated state after the loss of said carrier signal if said carrier signal resumes within said predetermined time period.
10. A method for transmitting data between a transmitting station and a receiving station which includes dividing data to be transmitted into a plurality of data packets, each data packet including a plurality of data words, the number of data words in a data packet determining the size of the data packet, transmitting said data packets to the receiving station, examining the data words in each received data packet for error and determining which data words are acceptable, transmitting an acknowledgment signal to the transmitting station for each acceptable data word, determining from the transmitted acknowledgment signals which data packets were received with unacceptable errors and retransmitting said unacceptable data packets, and determining the frequency of error in said received data packets from said acknowledgment signals and adjusting the size of subsequent data packets to be transmitted in accordance with said error frequency.
26. A cellular computer data transmission interface device for allowing a portable computer having a conventional data output terminal to operate a mobile cellular telephone having a cellular transceiver linked via radio signals to a cellular system in response to bus-compatible control signals generated by a control unit in response to direct operator input and supplied to the cellular transceiver over a bus directly connected to the control unit and the cellular transceiver, comprising:
(a) receiving means for receiving instructions from the portable computer, (b) processing means connected with said receiving means for interpreting the instructions received from the portable computer and for generating cellular transceiver control signals in response to said portable computer generated instructions, (c) transmitting means connected with said processing means for receiving said cellular transceiver control signals, generating bus-compatible signals from said control signals, and for transmitting said bus compatible signals to the bus through a connection between the transmitting means and the bus to cause the cellular transceiver to place a cellular telephone network call.
30. A cellular telephone data transmission interface device for use with a mobile cellular telephone of the type that has a cellular transceiver linked via radio signals to a cellular system in response to control signals generated by a control unit and supplied to the cellular transceiver over a bus directly connected to the control unit and the cellular transceiver, which allows an analog signaling device external to the mobile cellular telephone to transmit data signals to or receive data signals from the cellular transceiver using the cellular bus, so that the analog signaling device may transmit or receive data signals using the cellular system, comprising:
(a) bus interface means for connecting external devices to the cellular bus so that said external devices may transmit signals to or receive signals from the cellular transceiver, (b) switching means for selectably connecting one or more external devices to the bus interface means with at least one of said external devices being the external analog signaling device, and (c) control means for selectively controlling the operation of the switching means to connect the external analog signaling device to the bus interface means.
35. A system for transferring data over a radio telephone network when directly connected to a radio telephone network access device for allowing external control of the radio telephone network access device, comprising:
computer means for providing and receiving data signals; modem means operably connected to the computer means for modulating data signals received from said computer means for transmission over a radio telephone network access device and for demodulating data signals received from the radio telephone network access device for transmission to the computer means; interface means connected between said modem means and the radio telephone network access device for transmitting data signals to and receiving data signals from the radio telephone network access device, said interface means providing parallel lines for connection to said radio telephone network access device, said lines including a data transmit line for transmitting data signals from said modem means to the radio telephone network access device, a data receive line for transmitting data signals from the radio telephone network access device to said modem means, and plural control lines for providing digital control signals to the radio telephone network access device to control the operation of the device. 29. A cellular telephone data transmission interface device comprising interface means to connect to a cellular radiotelephone bus sensing means connected to the interface means for sensing digital cellular telephone control signals on control lines of the cellular bus, control signal generating means connected to the interface means for generating digital cellular telephone control signals and transmitting said digital cellular telephone control signals to the control lines of the cellular bus, and processing means connected to the sensing means and to the control signal generating means for receiving and evaluating the digital cellular telephone control signals sensed by the sensing means, wherein the processing means compares the sensed digital cellular telephone control signals to expected digital cellular telephone control signal values incorporated in said processing means and selects a first mode of operation of the control signal generating means enabling data transmission when the sensed digital cellular telephone control signals correspond to the expected digital cellular telephone control signal values and selects a second mode of operation of the control signal generating means if said sensed digital cellular telephone control signals do not correspond to said expected digital cellular telephone control signal values.
12. A signal processing interface for communicating data from a data source over a cellular telephone system to a receiving means via a cellular telephone radio carrier signal comprising processing means connected to receive data from said data source, said processing means operating to form said data into a data signal format to be transmitted as a data signal, the data signal format including blocks of data, at least one acknowledgement signal to be retransmitted by said receiving means back to said processing means upon receipt of each of said data blocks, cellular telephone transmission means operative upon receipt of said data signal format to transmit sad data signal to said receiving means, and modem means connected to said signal processing means and said cellular telephone transmission means and operative to receive said data signal containing said data signal format from said processing means and to provide said data signal for transmission to said cellular telephone transmission means, said modem means being operative to disconnect from said cellular telephone transmission means in response to a disconnect signal and inoperative to disconnect in response to a loss of said cellular telephone radio carrier signal, said processing means operating to provide a disconnect signal to said modem means when a delay period subsequent to a loss of said cellular telephone radio carrier signal has elapsed without the resumption of said cellular telephone radio carrier signal.
18. A data processing interface for operation in a transmitting mode for transmitting data from a data source over a cellular telephone system to a receiving means via a cellular telephone radio carrier signal comprising processing and control means connected to receive data from said data source, said processing and control means operating to form said data into a data signal format to be transmitted as a data signal, said data signal format including a plurality of data packets, each said data packet including a number of data and control words, the number of words in a data packet determining the size of the data packet, each said data packet including an error control correction data format having at least one acknowledgement section, the acknowledgement section adapted to be retransmitted by said receiving means as an acknowledgment signal when an acceptable data packet is received by said receiving means, and modem means connected to said processing and control means to receive said data signal therefrom, said modem means being operable to modulate said cellular telephone radio carrier signal with said data signal and to provide said modulated signal to said cellular telephone system, said modem means receiving the acknowledgment signals transmitted by the receiving means and operating to provide such acknowledgment signals to said processing and control means, the processing and control means determining from said acknowledgment signals the frequency of error in the received data packets and adjusting the size of subsequent data packets in the data signal in accordance with said error frequency.
15. A cellular telephone data communication system for communicating data from a data source over a cellular telephone system having a mobile transceiver unit operative to transmit and receive cellular telephone signals and a plurality of fixed transceiver units connected to transmit signals over a conventional telephone line system comprising a mobile signal processing interface means connected to said mobile transceiver unit and operative to communicate data from a data source to said mobile transceiver unit for transmission via a cellular telephone radio carrier signal or to receive a transmitted data signal from said mobile transceiver unit, and a static signal processing interface means connected to said conventional telephone line system and operative to communicate data from a data source over said conventional telephone line system to one of said fixed transceiver units for transmission via a cellular telephone radio carrier signal to said mobile unit or to receive a transmitted data signal via said conventional telephone line system, each said mobile signal processing interface means and static signal processing interface means being operative in a transmitting or receiving mode while the other operates in the opposite mode and each including signal processing and control means connected to receive data from a respective data source in the transmitting mode, said signal processing and control means also being operative in the receiving mode to receive a data signal from the associated mobile transceiver unit or associated conventional telephone line system, and modem means connected to said signal processing and control means, the signal processing and control means of the mobile or static signal processing interface means operating in the transmitting mode being operative to receive data from the associated data source and to form said data into a data signal format to be transmitted as a data signal to the modem means connected thereto, said modem means being operative to disconnect in response to a disconnect control signal and inoperative to disconnect in response to a loss of said cellular telephone radio carrier signal, the signal processing and control means operating to provide a disconnect control signal to the modem means connected thereto when a delay period subsequent to a loss of said radio carrier signal has elapsed without the resumption of said telephone radio carrier signal.
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As a first step in this transmission, the microprocessor checks the state of the cellular bus data lines. If the data lines are in use, the microprocessor enters a loop or waiting mode and does not actuate the AMPS interface and transmit the call control signals to the cellular bus until the data lines are not in use. When the data lines are not in use, the microprocessor will actuate the AMPS interface and transmit the call control signals to the cellular transceiver via the cellular bus. The method by which this first transmission step is implemented will be apparent to those skilled in the art on review of the commented source code implementing this step (located in the "dial.num" routine which is part of the BRIDGSUB routine) in the microfiche Software Appendix. The microprocessor then waits for the call to be answered, and if this does not occur, the NO branch is taken from the decision block 99 to block 100 to exit from the flow chart in FIG. 3. However, if the call is answered, the YES branch is taken from the decision block 98 to block 102, where the microprocessor 34 instructs the analog switch and conditioning system 32 to switch the signal path from the cellular interface to the modem 40. Subsequently, at block 104, the modem is instructed to transmit data received by the microprocessor.
The specific control functions of the microprocessor 34 during the transmission of a data stream are illustrated in greater detail in FIG. 4, and for purposes of this description, the data transmission is monitored as indicated by the decision block 106. As long as data is being transmitted through the microprocessor 34, the NO branch of the decision block 106 takes the decision to the block 104 to continue the transmission of data. However, once data transmission is finished, the YES branch of the decision block 106 is taken to the modem disconnect block 108 where the microprocessor instructs the modem to terminate its function. Then the analog switch and conditioning system 32 is instructed, as indicated by the block 110, to disconnect the path between the modem and the cellular interface and to reconnect the microprocessor which, at 112, instructs the cellular interface to hang up the telephone and terminate the call before exiting at 114.
Referring now to FIG. 4, a flow diagram is provided to illustrate in detail the operation of the microprocessor 34 during the block shown at 104 in FIG. 3 when data transmission is occuring. Again, the coding of the process steps used by the microprocessor 34 into the instructions suitable to control the microprocessor will be understood by one having ordinary skill in the art and are fully illustrated by the appendixed program.
Entering the flow chart at a start block 116, a data stream provided by the portable computer 36 through the RS 232 interface 38 is received by the microprocessor 32 as indicated by the block 118. Next, the data signal is modulated with the error detection and correction and other control bytes described in connection with FIG. 2, as illustrated by the block 120 and the modulated data stream is stored at 122. The data is then transmitted to the modem at 124, and the modem provides the data to the cellular interface for transmission. As previously indicated, the microprocessor provides the data to the modem in a modulated signal which has enough changing signals to keep the modem PLL in synchronization. However, during the operation of the modem, the microprocessor monitors the data and modem operation to make sure that the modem is not static. The microprocessor uses the transmission rate of the modem and the time when the last data byte was presented to determine when the modem is in a static condition, and as indicated by the decision block 126, when the modem is static, the YES line to the block 128 shows that a repetitive synch byte is generated which is transmitted to the modem.
When the modem is not in the static condition, the NO line from the decision block 126 to the block 130 indicates that the microprocessor waits for the receipt of acknowledgment signals from the receiving microprocessor 48 for each word and packet of data transmitted. In the event of a loss of carrier signals, the microprocessors 32 and 48 respond to a "break bit" from the modem and initiate a time clock before permitting modem disconnect. As indicated by the decision block 132, when the awaited carrier signals are totally missing for a time t which is equal to or greater than a predetermined time x, the YES line to a modem disconnect block 134 is followed. At this point, the same operation which has occured with the blocks 108, 110, 112 and 114 in FIG. 3 occurs, and the modem is disconnected from the cellular interface. The cellular interface is reconnected to the microprocessor at 136 which instructs the cellular interface to perform a hang-up operation before exiting at 140.
On the other hand, if the time when no carrier signals are received is less than the predetermined delay time period x, then the NO line from the decision block 132 to a data error frequency determination block 142 becomes relevant. Here, the frequency of data errors at the receiving data microprocessor 48 is determined and employed at block 144 to adjust the EDC packet to provide larger or smaller packets in the manner described in connection with FIG. 2. Then this portion of the program is exited at 146.
The operation of the microprocessors 32 and 48 during the reception of data, evaluation of data errors and transmission of acknowledgment signals has been fully described previously. Since this operation is similar to that which occurs with wire line and other data transmission systems, it will be readily understood by those having ordinary skill in the art, and the instructions for the microprocessors are disclosed in detail by the appendixed program.
The cellular telephone data communication system of the present invention provides a cooperating mobile data programming interface and static data programming interface which operate together to perform the functions necessary to control errors in an efficient way to permit data transmission in the limited voice band available when using cellular telephone technology. Since both interfaces incorporate a microprocessor with independent firmware storage capabilities, a flexible system is provided wherein various computer control devices can execute the functions provided by a cellular telephone system. At the same time, the unit permits the cellular telephone system to be employed for the conventional audio transmissions which the system was designed to handle.
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