Portable wireless communication systems
First Claim
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1. A system for wireless transmission of data, including position data, the system comprising:
- (i) a hand held digital computer;
(ii) a position-locating device providing position information to the digital computer;
(iii) a VHF and/or UHF radio frequency transmitter; and
(iv) a radio modem having an input for digital data from the hand held digital computer, a modulator for converting digital data from the computer into a modulated analogue RF signal, and an output connected to the transmitter for transmission of said modulated signal.
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Abstract
The invention provides a system for wireless transmission of data, including position data. The system includes a hand held digital computer, a position-locating device providing position information to the digital computer and a VHF and/or UHF radio frequency transmitter. A radio modem, having an input for digital data from the hand held digital computer and an output connected to the transmitter, includes a modulator for converting digital data from the computer into a modulated analogue RF signal for transmission.
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Citations
43 Claims
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1. A system for wireless transmission of data, including position data, the system comprising:
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(i) a hand held digital computer;
(ii) a position-locating device providing position information to the digital computer;
(iii) a VHF and/or UHF radio frequency transmitter; and
(iv) a radio modem having an input for digital data from the hand held digital computer, a modulator for converting digital data from the computer into a modulated analogue RF signal, and an output connected to the transmitter for transmission of said modulated signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19, 20, 21, 22, 23, 24, 27, 28, 29, 30, 31, 32, 37, 38, 41)
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18. A modem to provide an interface between a hand held digital computer, a radio frequency transmitter and/or receiver and a position locating device, the modem comprising:
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(i) an input/output port for connection to a communication port of the hand held digital computer;
(ii) a modulator and/or demodulator for converting digital data to a modulated radio frequency signal and/or for converting a modulated radio frequency signal to digital data;
(iii) an input for data from the position-locating device;
(iv) a switch for selectively connecting (a) the modulator and/or demodulator to said input/output port, or (b) the position locating device input to said input/output port; and
(v) a controller for controlling the operation of the switch. - View Dependent Claims (25)
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26. A method for the wireless transmission of a message from a sending station to a receiving station, the method comprising:
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(i) at the sending station, dividing the message into a number of discrete data packets;
(ii) sending a data packet by radio transmission from the sending station to the receiving station;
(iii) waiting for acknowledgement from the receiving station that the packet has been received;
(iv) once receipt of the packet has been acknowledged, sending a subsequent packet to the receiving station; and
(v) repeating steps (iii) and (iv) until all of the data packets have been sent.
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33. A method for receiving at a receiving station a message transmitted as a series of radio data packets from a sending station, each packet comprising a message data segment and a header, the header containing information including the address of the intended recipient of the message and the length of the message data segment, the method comprising:
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(i) detecting receipt at the receiving station by a radio receiver of the first packet of a new message;
(ii) determining from the packet header whether the receiving station is the intended recipient of the message, and if it is;
(iii) determining from the packet header the length of the message data segment of the packet;
(iv) extracting and storing the message data from the packet; and
(v) transmitting an acknowledgement of receipt of the package to the sending station. - View Dependent Claims (34, 35, 39, 40, 42, 43)
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36. A method for the wireless broadcast of a message from a sending station, the method comprising:
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(i) at the sending station, dividing the message into a number of discrete data packets;
(ii) labelling each packet as a broadcast packet;
(iii) transmitting a first data packet by radio transmission from the sending station;
(iv) transmitting at least one copy of the first data packet after a predetermined delay following transmission of the first data packet; and
(v) transmitting subsequent data packets, the transmission of each subsequent data packet being followed by the transmission of a copy of the packet prior to transmission of the next subsequent data packet.
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Specification