Procedures for passive access control

Patent metadata

Field	Value
Publication number	US-2017303084-A1
Application number	US-201715487511-A
Country	US
Kind code	A1
Filing date	Apr 14, 2017
Priority date	Apr 19, 2016
Publication date	Oct 19, 2017
Grant date	—

Abstract

A method for passive access control including a mobile device serving as key and an interaction unit, the mobile device and the interaction unit having in each case at least one data communication facility for exchanging authorization information. Operations are provided for carrying out an electronic distance measurement between the mobile device and the interaction unit and for permitting an access and/or an interaction only if the distance of the mobile device from the interaction unit is within a permitted distance.

First claim

1 . A method for passive access control wherein a mobile device, serving as a key, and an interaction unit each have at least one data communication facility for exchanging authorization information, the method comprising:
carrying out an electronic distance measurement between the mobile device and the interaction unit based on a transit time measurement of a radio signal; and permitting an access and/or an interaction only in response to the distance of the mobile device from the interaction unit being within a permitted distance, wherein the mobile device and the interaction unit each measure the distance, and wherein an access and/or an interaction is permitted only in response to a deviation of the two measured distances being zero or less than a predetermined limit value.

2 . The method of claim 1 , further comprising the mobile device transmitting the measured distance to the interaction unit,
wherein the deviation is determined by the interaction unit.

3 . The method of claim 1 , further comprising performing, between the mobile device and the interaction unit, an authentication method,
wherein an access and/or an interaction is permitted only in response to a successful authentication.

4 . The method of claim 1 , further comprising performing a data exchange and/or an authentication method between the mobile device and the interaction unit via a service and/or a link of the electronic distance measurement.

5 . The method of claim 1 , wherein the electronic distance measurement is carried out in response to detection of a contact information item.

6 . A passive access system comprising:
a mobile device serving as key; and an interaction unit, wherein the mobile device and the interaction unit each have at least one data communication facility configured for exchanging authorization information, wherein the mobile device and the interaction unit each have an electronic distance measuring facility configured for determining the distance between the mobile device and the interaction unit, wherein the mobile device and/or the interaction unit are configured to permit an access and/or an interaction only in response to the distance of the mobile device from the interaction unit being within a permitted distance, wherein the mobile device and the interaction unit are each configured to measure the distance, and wherein the mobile device and/or the interaction unit are each configured to permit an access and/or an interaction only in response to a deviation of the two measured distances being zero or less than a predetermined limit value and the electronic distance measurement is based on a transit-time measurement of a radio signal.

7 . The passive access system of claim 6 , wherein the data communication facilities exchange authorization information in the context of an authentication method and an access and/or an interaction is only permitted in response to a successful authentication.

8 . The passive access system of claim 6 , wherein the distance measuring facilities have radio-frequency transmitters and/or receivers.

9 . The passive access system of claim 6 , wherein the distance measuring facility is attached or has been attached subsequently on the mobile device utilized as vehicle key or has been integrated into the mobile device during production of the mobile device.

10 . The passive access system of claim 6 , wherein the distance measuring facilities are configured to detect reflected signals and not to use the reflected signals in a calculation of the distance.

11 . A vehicle having a passive access system, wherein an electronic distance measuring facility determining the distance between a mobile device and the vehicle is provided and the electronic distance measuring facility, wherein the mobile device, serving as a key, and the interaction unit each have at least one data communication facility for exchanging authorization information, wherein an electronic distance measurement is carried out between the mobile device and the interaction unit based on a transit time measurement of a radio signal, wherein an access and/or an interaction is performed only in response to the distance of the mobile device from the interaction unit being within a permitted distance, wherein the mobile device and the interaction unit each measure the distance, and wherein an access and/or an interaction is permitted only in response to a deviation of the two measured distances being zero or less than a predetermined limit value.

12 . The vehicle of claim 11 , wherein a number of electronic distance measuring facilities are provided and/or in that the distance measuring facilities is attached or have been attached subsequently on the vehicle or have already been integrated in the vehicle during the production of the vehicle.

Assignees

• Volkswagen Ag

Inventors

• Brückner Claus-Peter

Classifications

• G07C9/20

  involving the use of a pass · CPC title

• G07C9/28

  the pass enabling tracking or indicating presence · CPC title

• G07C2209/08

  With time considerations, e.g. temporary activation, valid time window or time limitations · CPC title

• G07C2009/00555

  comprising means to detect or avoid relay attacks · CPC title

• B60R25/24 Primary

  using electronic identifiers containing a code not memorised by the user · CPC title