ELECTRONIC COMMUNICATION SYSTEM, IN PARTICULAR ACCESS CONTROL SYSTEM FOR P(ASSIVE)K(EYLESS)E(NTRY), AS WELL AS METHOD FOR DETECTING A RELAY ATTACK THEREON
In order to provide an electronic communication system ( 100 ), in particular an access control system for P[assive]K[eyless]E[ntry], comprising at least one base station ( 10 ) being arranged in particular on or in an object to be secured against unauthorized use and/or against unauthorized access, for example being arranged on or in a vehicle and/or on or in an access system, at least one remote device ( 20 ), in particular at least one transponder unit, which remote device ( 20 ) may in particular be carried with him by an authorized user and/or is designed to exchange data signals ( 12, 22 ) with the base station ( 10 ), in which case, by means of the data signals ( 12, 22 ) the authorization for use and/or for access can be determined and/or the base station ( 10 ) can be controlled accordingly, wherein cost and complexity of the remote device ( 20 ) are reduced, it is proposed that the remote device ( 20 ) comprises at least one recording unit ( 24 ) for recording at least part of the data signals ( 12, 22 ), in particular for recording at least one first signal ( 12 ), being sent by the base station ( 10 ), and that the base station ( 10 ) comprises at least one processing unit ( 14 ) for processing the data signals ( 12, 22 ).
1 . An electronic communication system, in particular an access control system for P[assive]K[eyless]E[ntry], comprising
at least one base station being arranged in particular on or in an object to be secured against unauthorized use and/or against unauthorized access, for example being arranged on or in a vehicle and/or on or in an access system,
at least one remote device in particular at least one transponder unit, which remote device
may in particular be carried with him by an authorized user and/or
is designed to exchange data signals with the base station in which case, by means of the data signals
the authorization for use and/or for access can be determined and/or
the base station can be controlled accordingly, characterized in
that the remote device comprises at least one recording unit
for recording at least part of the data signals in particular for recording at least one first signal being sent by the base station and
that the base station comprises at least one processing unit for processing the data signals
2 . The electronic communication system according to claim 1 , characterized in
that the processing unit designed for determining the distance between the base station and the remote device by means of determining the T[ime]O[flF[light] (t,) of at least part of the data signals and
that the authorization for use and/or for access is determined at least dependent on the determined distance between the base station and the remote device
3 . The electronic communication system according claim 1 , characterized in that the processing unit designed
for measuring the carrier frequency of at least part of the data signals being (re)transmitted by the remote device and/or
for determining at least one clock rate of the remote device and/or
for correlating
at least part of the data signals and/or
the determined clock rate of the remote device
4 . A remote device for an electronic communication system according to claim 1 , characterized by
at least one receiving unit for receiving at least part of the data signals in particular for receiving at least one first signal being sent by the base station
at least one recording unit for recording at least part of the data signals in particular for recording at least one sent first signal being sent by the base station
at least one clock unit for providing at least one clock rate,
at least one transmission unit (re)transmitting the data signals in particular
for retransmitting at least one first signal being sent by the base station and
for transmitting at least one second signal to the base station
5 . A base station for an electronic communication system according to claim 1 , characterized by
at least one transmission unit for transmitting at least part of the data signals in particular at least one first signal to the remote device
at least one receiving unit for receiving the data signals being transmitted by the remote device and
at least one processing unit for processing the data signals
6 . A method for detecting and/or for guarding against at least one, in particular external, attack, and preferably at least one relay attack, on at least one electronic communication system according to the preamble of claim 1 , characterized in
that at least part of the data signals in particular at least one first signal being sent by the base station is recorded by the
remote device and
that the data signals are processed by the base station
7 . The method according to claim 6 , characterized in
that part of the data signals in particular the first signal being sent by the base station is recorded against at least one clock unit and/or
that the data signals in particular
the first signal being sent by the base station and
at least one second signal preferably including the retransmission time, are transmitted to the base station.
8 . The method according to claim 6 , characterized in
that the transmitted data signals are received, and/or
that the carrier frequency of at least part of the data signals being transmitted by the remote device is measured, and/or
that at least one clock rate of the remote device is determined, and/or
that at least part of the data signals and/or the determined clock rate of the remote device is correlated by the base station
9 . The method according to claim 6 , characterized in
that the distance between the base station and the remote device is determined by means of determining the T[ime]O[flF[light] (t,)of at least part of data signals and
that the authorization for use and/or for access is determined at least dependent on the determined distance between the base station and, the remote device
10 . (canceled)