Access control devices and a transceiver device

An access control device comprising:

• a time of flight circuit configured to determine a distance information related to a distance between the access control device and a mobile device;
• and
• a control circuit configured to control a transmission of a modulated light transmit signal by the time of flight circuit to the mobile device, wherein the modulated light transmit signal comprises the distance information determined by the time of flight circuit of the access control device,
• wherein the control circuit is configured to control the time of flight circuit to transmit the modulated light transmit signal comprising the distance information after receiving a transmission access request from the mobile device,
• wherein the time of flight circuit is configured to receive from the mobile device a modulated light receive signal comprising further distance information related to the distance between the access control device and the mobile device, and
• wherein the control circuit is configured to control the time of flight circuit to transmit a further modulated light transmit signal comprising information for establishing a wireless transmission channel between the access control device and the mobile device if the further distance information received from the mobile device is equal to or within an application defined percentage of the distance information determined by the time of flight circuit of the access control device.

A mobile device, comprising:

• a time of flight circuit configured to transmit a transmission access request to an access control device, wherein the time of flight circuit is configured to receive a modulated light receive signal from the access control device in response to the transmission access request, wherein the modulated light receive signal comprises distance information related to a distance between the mobile device and the access control device;
• and
• a control circuit configured to control an establishing of a wireless transmission channel between the mobile device and the access control device based on the distance information received from the access control device,
• wherein the time of flight circuit is configured to determine further distance information related to the distance between the access control device and the mobile device, and to transmit the distance information determined by the time of flight circuit of the mobile device to the access control device, and
• wherein the control circuit is configured to control the establishing of the wireless transmission channel between the mobile device and the access control device based on further distance information related to a distance between the mobile device and the access control device determined by the time of flight circuit of the mobile device and the distance information received from the access control device.