Mobile device for communicating and ranging with access control system for automatic functionality
Two different wireless protocols can be used for ranging between a mobile device and an access control system (e.g., a vehicle). The first wireless protocol (e.g., Bluetooth®) can be used to perform authentication of the vehicle and exchange ranging capabilities between a mobile device (e.g., a phone or watch) and the vehicle. The second wireless protocol (e.g., ultra-wideband, UWB) can use a pulse width that is less than a pulse width used by the first wireless protocol (e.g., 1 ns v. 1 μs). The narrower pulse width can provide greater accuracy for distance (ranging) measurements.
1. A method for performing communications between a mobile device and an access control system, the method comprising performing, by the mobile device:
authenticating the access control system using a first wireless protocol;
after authentication, creating a secure channel between the mobile device and the access control system using a shared secret, the secure channel using the first wireless protocol;
communicating, using the secure channel, one or more ranging capabilities with the access control system for ranging to be performed using a second wireless protocol;
transmitting, using the second wireless protocol, a first set of pulses in a ranging request message to the access control system, wherein the second wireless protocol uses a pulse width that is less than a pulse width used by the first wireless protocol;
receiving, using the second wireless protocol, a second set of pulses in one or more ranging response messages from the access control system;
determining distance information corresponding to a transmission time(s) of the first set of pulses and a reception time(s) of the second set of pulses; and
sending the distance information to the access control system, thereby enabling the access control system to perform an operation.
2. The method of claim 1 , wherein the one or more ranging response messages are a plurality of ranging response messages, each from a different antenna unit of the access control system and including identifying information specific to a particular antenna unit.
3. The method of claim 2 , wherein the ranging request message is broadcast to the plurality of ranging response messages.
4. The method of claim 1 , wherein authenticating the access control system includes:
sending a challenge to the access control system, the challenge to be operated on by a control unit of the access control system using an encryption key to provide a response;
receiving the response from the access control system; and
comparing the response to an expected result to authenticate the control unit of the access control system.
5. The method of claim 1 , further comprising:
determining a distance of the mobile device from the access control system using the transmission time(s) of the first set of pulses and the reception time(s) of the second set of pulses, wherein the distance information includes the distance.
6. The method of claim 1 , wherein the distance information includes timestamps corresponding to the first set of pulses in the ranging request message and the second set of pulses in the one or more ranging response messages, the timestamps configurable to be used by a control unit of the access control system to determine a distance of the mobile device from the access control system.
7. The method of claim 1 , wherein the operation is to unlock a door of the access control system.
8. The method of claim 1 , wherein the one or more ranging capabilities specify a format for ranging messages between the mobile device and the access control system using the second wireless protocol.
9. The method of claim 1 , wherein the first wireless protocol is Bluetooth® and the second wireless protocol is ultra-wideband (UWB), wherein the first wireless protocol uses a first antenna and the second wireless protocol uses a second antenna, and wherein the mobile device is a mobile phone.
10. The method of claim 1 , wherein the access control system is a vehicle.
11. A computer product comprising a non-transitory computer readable medium storing a plurality of instructions, that when executed, control a computing device to perform:
authenticating an access control system using a first wireless protocol;
after authentication, creating a secure channel between the computing device and the access control system using a shared secret, the secure channel using the first wireless protocol;
communicating, using the secure channel, one or more ranging capabilities with the access control system for ranging to be performed using a second wireless protocol;
transmitting, using the second wireless protocol, a first set of pulses in a ranging request message to the access control system, wherein the second wireless protocol uses a pulse width that is less than a pulse width used by the first wireless protocol;
receiving, using the second wireless protocol, a second set of pulses in one or more ranging response messages from the access control system;
determining distance information corresponding to a transmission time(s) of the first set of pulses and a reception time(s) of the second set of pulses; and
sending the distance information to the access control system, thereby enabling the access control system to perform an operation.
12. The computer product of claim 11 , wherein the one or more ranging response messages are a plurality of ranging response messages, each from a different antenna unit of the access control system and including identifying information specific to a particular antenna unit.
13. The computer product of claim 11 , wherein authenticating the access control system includes:
sending a challenge to the access control system, the challenge to be operated on by a control unit of the access control system using an encryption key to provide a response;
receiving the response from the access control system; and
comparing the response to an expected result to authenticate the control unit of the access control system.
14. The computer product of claim 11 , wherein the plurality of instructions further control the computing device to perform:
determining a distance of the computing device from the access control system using the transmission time(s) of the first set of pulses and the reception time(s) of the second set of pulses, wherein the distance information includes the distance.
15. The computer product of claim 11 , wherein the distance information includes timestamps corresponding to the first set of pulses in the ranging request message and the second set of pulses in the one or more ranging response messages, the timestamps configurable to be used by a control unit of the access control system to determine a distance of the computing device from the access control system.
16. A mobile device comprising one or more processors configured to perform:
authenticating an access control system using a first wireless protocol;
after authentication, creating a secure channel between the mobile device and the access control system using a shared secret, the secure channel using the first wireless protocol;
communicating, using the secure channel, one or more ranging capabilities with the access control system for ranging to be performed using a second wireless protocol;
transmitting, using the second wireless protocol, a first set of pulses in a ranging request message to the access control system, wherein the second wireless protocol uses a pulse width that is less than a pulse width used by the first wireless protocol;
receiving, using the second wireless protocol, a second set of pulses in one or more ranging response messages from the access control system;
determining distance information corresponding to a transmission time(s) of the first set of pulses and a reception time(s) of the second set of pulses; and
sending the distance information to the access control system, thereby enabling the access control system to perform an operation.
17. The mobile device of claim 16 , wherein the one or more ranging response messages are a plurality of ranging response messages, each from a different antenna unit of the access control system and including identifying information specific to a particular antenna unit.
18. The mobile device of claim 16 , wherein authenticating the access control system includes:
sending a challenge to the access control system, the challenge to be operated on by a control unit of the access control system using an encryption key to provide a response;
receiving the response from the access control system; and
comparing the response to an expected result to authenticate the control unit of the access control system.
19. The mobile device of claim 16 , wherein one or more processors are further configured to perform:
determining a distance of the mobile device from the access control system using the transmission time(s) of the first set of pulses and the reception time(s) of the second set of pulses, wherein the distance information includes the distance.
20. The mobile device of claim 16 , wherein the distance information includes timestamps corresponding to the first set of pulses in the ranging request message and the second set of pulses in the one or more ranging response messages, the timestamps configurable to be used by a control unit of the access control system to determine a distance of the mobile device from the access control system.