Method of transmitting information between two units each provided with means for sending and/or receiving signals
First Claim
1. A method of wireless transmission of information between at least two units consisting of two computer stations or two personalised portable objects or a personalised portable object and a computer station, the portable object and the station each having signal transmitting and/or receiving means for bi-directional transmission of information frames modulated onto a carrier selected from a plurality of available transmission carriers, the transmitting and/or receiving means being switched alternately, when they are activated, to a signal transmitting mode and a signal receiving mode, the portable object including a data management unit connected to the transmitting and/or receiving means to manage received or transmitted information frames and a memory for storing data which is connected to the data management unit, which method includes the following steps:
- transmitting from one unit to the other unit an information frame modulated onto the selected carrier and including a synchronisation field, which consists of a particular number of bytes of identical value, and an information packet;
counting bytes in the synchronisation field of the received frame, andcomparing the number of bytes counted with a particular threshold number to transmit an indication for correcting the number of bytes in the synchronisation field of the next frame to be received.
1 Assignment
0 Petitions
Accused Products
Abstract
The method is one of wireless transmission of information between two units consisting primarily of a portable object, such as a personalized watch (1), and a computer station (20). Each unit includes signal transmitting and/or receiving means (2, 24, 26) switched alternately to a transmitting mode and into a receiving mode. Information is transmitted by transmitting a plurality of information frames alternately between the two units. Each information frame comprises a synchronization field, which includes a particular number of synchronization bytes, an information packet and filler bytes. On receiving a frame, the receiving unit counts the synchronization bytes. The receiving unit transmits, in a heading of the information packet, a synchronization indication which is a function of the number of synchronization bytes received. The synchronization indication is used to correct the size of the synchronization field of the next frame received by the receiving unit. These synchronization field size correction operations are effected in a similar manner in both units.
17 Citations
9 Claims
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1. A method of wireless transmission of information between at least two units consisting of two computer stations or two personalised portable objects or a personalised portable object and a computer station, the portable object and the station each having signal transmitting and/or receiving means for bi-directional transmission of information frames modulated onto a carrier selected from a plurality of available transmission carriers, the transmitting and/or receiving means being switched alternately, when they are activated, to a signal transmitting mode and a signal receiving mode, the portable object including a data management unit connected to the transmitting and/or receiving means to manage received or transmitted information frames and a memory for storing data which is connected to the data management unit, which method includes the following steps:
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transmitting from one unit to the other unit an information frame modulated onto the selected carrier and including a synchronisation field, which consists of a particular number of bytes of identical value, and an information packet; counting bytes in the synchronisation field of the received frame, and comparing the number of bytes counted with a particular threshold number to transmit an indication for correcting the number of bytes in the synchronisation field of the next frame to be received. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification