Method for performing distance measurement and authentication concurrently and electronic device thereof

1. An electronic device of a vehicle, comprising:

a communication circuit performing communication with an external electronic device, according to a first communication scheme, and a second communication scheme different than the first communication scheme;

at least one processor operably connected with the communication circuit; and

at least one memory operably connected with the at least one processor,

wherein the at least one memory stores instructions executable by the at least one processor to cause the electronic device to:

exchange authentication information with the external electronic device, using the first communication scheme;

generate a first secure preamble;

execute ranging with the external electronic device via the communication circuit, using the second communication scheme, including:

transmitting, using the communication circuit, a distance measurement signal including the first secure preamble to the external electronic device,

receiving a response signal through the communication circuit including a second secure preamble generated by the external electronic device from the external electronic device,

determining a distance to the external electronic device based on a transmission time of the distance measurement signal and a reception time of the response signal; and

responsive to detecting that the external electronic device is disposed outside of the vehicle and the determined distance is within a predetermined range:

authenticating the response signal based on the second secure preamble and the first secure preamble,

based on successful authentication, re-executing ranging between the electronic device and the external electronic device, using the received response signal generated by the external electronic device, and

responsive to detecting occurrence of an event related to operation of the vehicle, executing a separate authentication with the external electronic device different from the authenticating of the received response signal.

2. The electronic device of claim 1 , wherein the instructions are executable by the at least one processor to cause the electronic device to:

in response to successful authentication, control the communication circuit to transmit a final signal including the first secure preamble to the external electronic device; and

responsive to detecting that the external electronic device is disposed in an interior of the vehicle, re-executing again the ranging with the external electronic device, including re-executing the authentication, using the received response signal generated by the external electronic device.

3. The electronic device of claim 1 , wherein exchanging the authentication information using the first communication scheme includes:

generating and transmitting first credential information to the external electronic device, and receiving second credential information of the external electronic device from the external electronic device, wherein the instructions are executable by the at least one processor to cause the electronic device to: generate the first secure preamble based on at least part of the first credential information and the second credential information; and

re-execute the ranging based on detecting a change in state of the external electronic device relative to the electronic device.

4. The electronic device of claim 3 , wherein the communication circuit comprises a first communication circuit and a second communication circuit,

wherein the first credential information is transmitted through the first communication circuit, and

wherein the distance measurement signal and the response signal are transceived through the second communication circuit,

wherein the state of the external electronic device is selected from among states including an in-door state indicating presence within a vehicle in which the electronic device is disposed, a run-engine state indicating the vehicle is running, and a drive state indicating the vehicle is in motion.

5. The electronic device of claim 3 , wherein the instructions are executable by the at least one processor to cause the electronic device to:

encrypt the first credential information with a first public key of the external electronic device, and transmit the encrypted credential information to the external electronic device;

receive second credential information encrypted with a second public key of the electronic device from the external electronic device; and

decode the second encrypted credential information with a private key of the electronic device to acquire the decoded second credential information.

6. The electronic device of claim 1 , wherein the distance with the external electronic device is measured using signals including a general preamble;

wherein the instructions are executable by the at least one processor to cause the electronic device to:

detect whether the measured distance meets a previously specified condition, or whether a first event has been received,

wherein the distance measurement signal including the first secure preamble is transmitted in response to detecting that the measured distance meets the previously specified condition, or that the first event is received.

7. The electronic device of claim 1 , wherein authenticating the response signal and determining the distance further includes: detecting whether a second event has been received,

wherein the instructions are executable by the at least one processor to cause the electronic device to:

in response to detecting that the second event is received, perform a separate authentication procedure with the external electronic device.

8. An electronic device of a vehicle, comprising:

a communication circuitry performing communication with an external electronic device, according to a first communication scheme, and a second communication scheme different than the first communication scheme;

at least one processor operably connected with the communication circuitry; and

at least one memory operably connected with the at least one processor,

wherein the at least one memory stores instructions executable by the at least one processor to cause the electronic device to:

exchange authentication information using the first communication scheme;

generate a first secure preamble;

in responsive to detecting that the external electronic device is disposed outside of the vehicle and is within a predetermined range, execute ranging using the second communication scheme, including:

receiving, using the communication circuitry, a distance measurement signal including a second secure preamble generated by the external electronic device from the external electronic device,

authenticating the distance measurement signal based on the second secure preamble of the external electronic device included in the received distance measurement signal, and

in response to successful authentication, transmitting a response signal including the first secure preamble to the external electronic device; and

executing ranging between the electronic device and the external electronic device, based on a reception time of the distance measurement signal and a transmission time of the response signal, and

in responsive to detecting occurrence of an event related to operation of the vehicle, executing a separate authentication with the external electronic device different from a first authenticating of a received response signal.

9. The electronic device of claim 8 , wherein the at least one memory stores instructions executable by the at least one processor to cause the electronic device to:

receive a final signal from the external electronic device through the communication circuitry;

authenticate the final signal based on a third secure preamble of the external electronic device included in the received final signal; and

in response to successful authentication, determine a distance to the external electronic device based on a transmission time of the response signal and a reception time of the final signal

wherein responsive to detecting that the external electronic device is disposed in an interior of the vehicle, the external electronic device re-executes the ranging with the electronic device, including transmitting the received response signal to the external electronic device.

10. The electronic device of claim 8 , wherein the at least one memory stores instructions executable by the at least one processor to cause the electronic device to:

receive first credential information of the external electronic device from the external electronic device,

wherein exchanging the authentication information using the first communication scheme includes: generating and transmitting second credential information to the external electronic device,

wherein the secure preamble is generated based on at least part of the first credential information and the second credential information, and

wherein the ranging is re-executed based on detecting a change in state of the external electronic device relative to the electronic device.

11. The electronic device of claim 10 , wherein the communication circuitry includes a first communication circuit and a second communication circuit,

wherein the first credential information is transmitted through the first communication circuit, and

wherein the distance measurement signal and the response signal are transceived through the second communication circuit,

wherein the state of the external electronic device is selected from among states including an in-door state indicating presence within a vehicle in which the electronic device is disposed, a run-engine state indicating the vehicle is running, and a drive state indicating the vehicle is in motion.

12. The electronic device of claim 10 , wherein the at least one memory stores instructions executable by the at least one processor to cause the electronic device to:

receive the first credential information encrypted with a first public key of the electronic device; and

decode the encrypted first credential information with a private key of the electronic device to acquire the decoded first credential information,

wherein the second credential information is encrypted with a second public key of the external electronic device when transmitted to the external electronic device.

13. The electronic device of claim 8 , wherein the at least one memory stores instructions executable by the at least one processor to cause the electronic device to:

receive a distance measurement signal including a general preamble from the external electronic device through the communication circuitry; and

in response to receiving the distance measurement signal, transmit a response signal including the general preamble through the communication circuitry.

14. The electronic device of claim 8 , wherein the at least one memory stores instructions executable by the at least one processor to cause the electronic device to:

perform a separate authentication procedure with the external electronic device.

15. An operation method of an electronic device of a vehicle, the method comprising:

exchange authentication information with an external electronic device, using a communication circuit operating in a first communication scheme;

generating, by a processor, a first secure preamble;

executing ranging with the external electronic device via the communication circuit, using a second communication scheme different from the first communication scheme, including:

controlling by the processor the communication circuit to transmit a distance measurement signal including the first secure preamble to an external electronic device,

controlling the communication circuit to receive a response signal including a second secure preamble from the external electronic device,

and

determining a distance to the external electronic device based on a transmission time of the distance measurement signal and a reception time of the response signal; and

responsive to detecting that the external electronic device is disposed outside of the vehicle and the determined distance is within a predetermined range:

authenticating the response signal based on the second secure preamble and the first secure preamble,

based on successful authentication, re-executing ranging between the electronic device and the external electronic device, using the received response signal generated by the external electronic device, and

in responsive to detecting occurrence of an event related to operation of the vehicle, executing a separate authentication with the external electronic device different from the authenticating of the received response signal.

16. The method of claim 15 , further comprising:

in response to successful authentication, control the communication circuit to transmit a final signal including the first secure preamble to the external electronic device; and

wherein responsive to detecting that the external electronic device is disposed in an interior of the vehicle, the external electronic device re-executes the ranging with the electronic device, including transmitting the received response signal to the external electronic device.

17. The method of claim 15 , wherein exchanging the authentication information using the first communication scheme includes:

generating and transmitting first credential information to the external electronic device; and

receiving second credential information of the external electronic device from the external electronic device; and

wherein the method further comprises: generating the first secure preamble based on at least part of the first credential information and the second credential information; and

re-executing the ranging based on detecting a change in state of the external electronic device relative to the electronic device.

18. The method of claim 17 , further comprising:

encrypting the first credential information with a first public key of the external electronic device and transmitting the encrypted credential information to the external electronic device;

receiving second credential information encrypted with a second public key of the electronic device from the external electronic device; and

decoding the second encrypted credential information with a private key of the electronic device to acquire the decoded second credential information.

19. The method of claim 15 , wherein the distance with the external electronic device is measured using signals including a general preamble, the method further comprising:

detecting whether the measured distance meets a previously specified condition, or whether a first event has been received,

wherein the distance measurement signal including the first secure preamble is transmitted in response to detecting that the measured distance meets the previously specified condition, or that the first event is received.

20. The method of claim 15 , wherein authenticating the response signal and determining the distance further includes: detecting whether a second event has been received, the method further comprising: in response to detecting that the second event is received, perform a separate authentication procedure with the external electronic device.