Method for performing scanning in wireless communication system, and apparatus therefor

1. A method of performing scanning by a first device in a wireless communication system, the method comprising:

receiving a scan request for at least one neighboring device; and

performing a scan negotiation procedure with a second device,

wherein the scan negotiation procedure comprises:

exchanging scan role assignment parameters related with a determination of a scan role device to perform a scan role with the second device;

determining the scan role device to perform the scan role based on the scan role assignment parameters; and

obtaining capability information on the at least one neighboring device from the scan role device,

wherein the exchanging scan role assignment parameters with the second device comprises:

exchanging candidate parameters related with scanning; and

exchanging available parameters used for the scanning among the candidate parameters,

wherein the candidate parameters are divided into a general candidate parameter and a functional candidate parameter,

wherein the general candidate parameter is related with an environment value of the scan role device, and

wherein the functional candidate parameter is related with at least one of a user condition and a user setting.

2. The method of claim 1 , wherein:

the scan role device is determined based on a dynamic scan role assignment (DSRA) algorithm, and

the DSRA algorithm comprises:

selecting a specific parameter of the exchanged available parameters;

calculating a scan role assignment value by multiplying the selected specific parameter by a scale factor; and

determining the scan role device based on the calculated scan role assignment value.

3. The method of claim 1 , wherein the general candidate parameter is information related to an amount of remaining battery power of the scan role device, a supplied power method, allocated computing resources, a number of currently connected devices, a role value related to a role of the scan role device or a manufacturer.

4. The method of claim 1 , further comprising performing a scan role authority procedure with the second device in order to determine whether or not to perform the scan negotiation procedure.

5. The method of claim 4 , wherein the scan role authority procedure comprises a step of exchanging authority parameters related to a scan role authority with the second device.

6. The method of claim 5 , wherein the authority parameter is set as a first parameter related to a registration of a user device, a second parameter related to a scan request level, a third parameter related to a product group of the scan role device or a fourth parameter related to security.

7. The method of claim 6 , wherein the scan negotiation procedure is performed when the second parameter of the first device is lower than the second parameter of the second device and the third parameter of the first device is different from the third parameter of the second device.

8. The method of claim 4 , wherein:

the scan negotiation procedure further comprises a step of transmitting a scan role request message to the second device, and

the scan role authority procedure is performed after transmitting the scan role request message.

9. The method of claim 1 , wherein the scan negotiation procedure is performed when a mode of the second device is set as a scan acceptable mode.

10. The method of claim 1 , wherein:

the scan role comprises a direct scan role and an indirect scan role,

the direct scan role obtains the capability information on the at least one neighboring device by scanning a radio frequency (RF) channel in a non-connection state with the at least one neighboring device, and

the indirect scan role obtains the capability information on the at least one neighboring device using a data channel in a connection state with the at least one neighboring device.

11. The method of claim 1 , further comprising a step of transmitting a scan negotiation confirm message for checking the scan role device to perform the scan role to the second device.

12. A first device for performing scanning in a wireless communication system, the first device comprising:

a transceiver; and

a processor functionally connected to the transceiver,

wherein the processor is configured to:

control the transceiver to receive a scan request for at least one neighboring device, and

perform a scan negotiation procedure with a second device,

wherein the scan negotiation procedure comprises:

exchanging scan role assignment parameters related with a determination of a scan role device with the second device;

determining the scan role device to perform scan role based on the scan role assignment parameters; and

obtaining capability information on the at least one neighboring device from the scan role device,

wherein the exchanging scan role assignment parameters with the second device comprises:

exchanging candidate parameters related with scanning; and

exchanging available parameters used for the scanning among the candidate parameters,

wherein the candidate parameters are divided into a general candidate parameter and a functional candidate parameter,

wherein the general candidate parameter is related with an environment value of the scan role device, and

wherein the functional candidate parameter is related with at least one of a user condition and a user setting.