Single communication channel between a contactless frontend device and a transceiver device

Abstract

Method for exchanging data between an NFC device ( 10 ) and a transceiver device ( 20 ) via a single communication channel ( 30 ), comprising the steps:—extracting a clock for the data exchange on the communication channel ( 30 ) from an external RF field ( 50 ); and—coding of the data via symbols, wherein the symbols comprise status information relating to simultaneous accesses of contactless card functionalities ( 21, 22, 23 ) on the transceiver ( 20 ) to the single communication channel ( 30 ).

1 . A method for exchanging data between a contactless frontend device and a transceiver device via a single communication channel, comprising the steps:
 extracting a clock (CLK) for the data exchange on the single communication channel from an external RF-field; and   coding of the data via symbols, wherein the symbols comprise status information relating to simultaneous accesses of contactless card functionalities on the transceiver to the single communication channel.   
     
     
         2 . The method according to  claim 1 , wherein the data on the single communication channel are coded via electrical voltages. 
     
     
         3 . The method according to  claim 2 , wherein a framing of the data on the single communication channel is bit-oriented. 
     
     
         4 . Method according to  claim 3 , wherein the exchange of the data on the single communication channel is executable in half-duplex. 
     
     
         5  The method according to  claim 1 , wherein an RF-communication protocol is executable completely by the transceiver, and wherein a protocol for the single communication channel is executable by the contactless frontend device and by the transceiver. 
     
     
         6 . The method according to  claim 5 , wherein the method is executable for a plurality of the transceivers being connected to the single communication channel. 
     
     
         7 . A single communication channel for an exchange of data between a contactless frontend device and a transceiver device, wherein the data are coded via symbols, wherein the symbols comprise status information relating to simultaneous accesses of contactless card functionalities on the transceiver device to the single communication channel. 
     
     
         8 . The single communication channel according to  claim 7 , wherein the single communication channel is formed as a single wire. 
     
     
         9 . The single communication channel according to  claim 8 , wherein the data on the single communication channel are coded via electrical voltages. 
     
     
         10 . The single communication channel according to  claim 9 , wherein the exchange of the data is executable in half duplex. 
     
     
         11 . The single communication channel according to  claim 10 , wherein an RF-communication protocol is executable completely by the transceiver, and wherein a protocol for the single communication channel is executable by the contactless frontend device and by the transceiver. 
     
     
         12 . The single communication channel according to  claim 11 , wherein the method is executable for a plurality of the transceivers being connected to the single communication channel. 
     
     
         13 . An RFID communication system, comprising a contactless frontend device, a transceiver device and a single communication channel, wherein the single communication channel is connected both to the contactless frontend device and to the transceiver device.