Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1996-10-01
1999-06-22
Lefkowitz, Edward
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359111, 359140, 359172, 359176, H04B 1000
Patent
active
059147962
ABSTRACT:
The invention relates to a communication protocol with the aid of which a half-duplex type data transfer link is arranged between two devices, advantageously a mobile telephone (3) and a data adapter (2) in a computer (1). The link can be in a transfer mode, when data being transferred and control messages (CM) are passed between the devices, or an idle mode, when control messages (CM1, CM2, CM1', CM2') are passed between the devices. In idle mode the timing of the transmission of control messages is free and if two messages (CM1, CM2) collide, i.e. are transmitted simultaneously, they are re-transmitted (CM1', CM2') after time intervals of different duration. In transfer mode mobile telephone (3) regularly transmits a single frame (DATA) decoded by it and immediately before that a possible control message (CM). Data adapter (2) transmits a frame (DATA) every time it receives a frame transmitted by the mobile telephone and immediately after trans-mitting the frame transmits a possible control message (CM). A device can be switched into a sleep mode, in which it receives only for a short time (T2) at regular intervals (T1). A device in sleep mode can be woken up by a wake-up signal.
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Lefkowitz Edward
Nokia Mobile Phones Ltd.
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