Image forming apparatus supporting Wi-Fi direct and method of activating Wi-Fi direct

1. A multi-function printer (MFP) supporting Wi-Fi Direct, the MFP comprising:

a print engine to perform a print operation;

a first wireless interface to connect the MFP to an access point (AP) of an infrastructured network;

a second wireless interface to connect the MFP to an external wireless terminal by Wi-Fi Direct;

a soft AP to allow the MFP to perform as an AP;

a dynamic host configuration protocol (DHCP) server unit to allocate an internet protocol (IP) address to the wireless device that is Wi-Fi Direct connected to the MFP;

a Wi-Fi Direct connection manager to manage the Wi-Fi Direct connection; and

an automatic group owner (AGO) manager to activate Wi-Fi Direct so as to drive the soft AP and operate the MFP as a group owner (GO) when the MFP receives a Wi-Fi Direct activation request.

2. The MFP of claim 1 , wherein the Wi-Fi Direct connection manager sets a GO flag of the MFP as a turned on state or a turned off state, and the AGO manager activates Wi-Fi Direct so that the MFP becomes a GO when the GO flag is in the turned on state.

3. The MFP of claim 2 , wherein the Wi-Fi Direct connection manager sets the GO flag in the turned on state always.

4. The MFP of claim 2 , wherein the Wi-Fi Direct connection manager sets the GO flag to be turned on when the MFP receives the initialization command.

5. The MFP of claim 1 , further comprising:

a channel manager to manage channels used in connections via the first wireless interface and the second wireless interface,

wherein the channel manager changes the channel used in the connection via the second wireless interface to the channel used in the connection via the first wireless interface, when the MFP is connected to the AP of the infrastructured network via the first wireless interface.

6. The MFP of claim 5 , wherein when the MFP is Wi-Fi Direct connected to the external wireless terminal via the second wireless interface in a state where the MFP is already connected to the AP of the infrastructured network via the first wireless interface, the channel manager performs the connection through the second wireless interface by using the channel used in the connection through the first wireless interface.

7. The MFP of claim 5 , further comprising:

a channel storage unit to store channels,

wherein the channel manager stores the channel used in the connection via the first wireless interface when the MFP is connected to the AP of the infrastructured network via the first wireless interface, and uses the stored channel when the MFP is Wi-Fi Direct connected to the external wireless terminal via the second wireless interface.

8. The MFP of claim 7 , wherein the channel manager stores the channel used in the connection via the first wireless interface in the channel storage unit, together with information about the AP including a service set identifier (SSID) of the AP of the infrastructured network to which the MFP is connected via the first wireless interface.

9. A method of activating Wi-Fi Direct in a multi-function printer (MFP) supporting Wi-Fi Direct, the method comprising:

receiving a Wi-Fi Direct activation request by the MFP; and

driving a soft access point (AP) of the MFP in order to activate Wi-Fi Direct so that the MFP functions as a group owner (GO).

10. The method of claim 9 , wherein the activating of the Wi-Fi Direct comprises:

identifying a GO flag of the MFP;

activating Wi-Fi Direct so that the MFP may function as a GO when the identified GO flag is in a turned on state; and

setting the GO flag in a turned on state always.

11. The method of claim 9 , wherein the activating of the Wi-Fi Direct comprises:

identifying the GO flag of the MFP and activating Wi-Fi Direct so that the MFP may function as the GO when the GO flag is in a turned on state; and

setting the GO flag in a turned on state when the MFP receives an initialization command.

12. The method of claim 9 , further comprising:

connecting the MFP to an AP of an infrastructured network via a first wireless interface; and

Wi-Fi Direct connecting the MFP to an external wireless terminal via a second wireless interface by using a channel used in the connection via the first wireless interface.

13. The method of claim 12 , further comprising:

storing the channel used in the connection via the first wireless interface; and

connecting the MFP to the external wireless terminal in the Wi-Fi Direct via the second wireless interface by using the stored channel.

14. The method of claim 12 , wherein the Wi-Fi Direct connecting of the MFP comprises:

driving a soft AP of the MFP so that the MFP functions as the AP; and

driving a dynamic host configuration protocol (DHCP) server of the MFP to allocate an internet protocol (IP) address to the wireless terminal, to which the MFP is Wi-Fi Direct connected.

15. A non-transitory computer-readable recording medium having embodied thereon a program to execute a method of claim 9 in a computer.

16. A multi-function printer (MFP) supporting Wi-Fi Direct, the MFP comprising:

an interface configured to receive a Wi-Fi Direct activation request; and

a processor unit configured to drive a soft access point (AP) to activate Wi-Fi Direct such that the MFP functions as a group owner (GO) according to the received Wi-Fi Direct activation request.

17. The MFP of claim 16 , further comprising:

a print engine to perform a print operation;

wherein the interface performs wireless communication with an external device using Wi-Fi Direct, and the processor unit controls the print engine to perform the printing operation according to data received through the wireless communication using the Wi-Fi-Direct.

18. The MFP of claim 16 , wherein:

the interface performs a first wireless communication with an external wireless device according to the Wi-Fi Direct and performs a second wireless communication with an access point of an infrastructured network; and

the processor unit is configured to set a channel for the first wireless communication and the second wireless communication and is configured to control the print engine to perform the print operation according to data received through any one of the first wireless communication or the second wireless communication using the Wi-Fi Direct.

19. The MFP of claim 16 , wherein:

the interface performs a first wireless communication with an external wireless device according to the Wi-Fi Direct and performs a second wireless communication with an access point of an infrastructured network; and

the processor unit checks a channel which has been previously used in any one of the first wireless communication and the second wireless communication and sets the channel for either one of the first wireless communication and the second wireless communication.

20. The MFP of claim 16 , wherein:

the interface performs a first wireless communication with an external wireless device according to a Wi-Fi Direct connection and performs a second wireless communication with an access point of an infrastructured network; and

the processor separates a security domain between the infrastructured network connection and the Wi-Fi Direct connection.

21. The MFP of claim 16 , wherein the processor unit allocates an internet protocol (IP) address to the wireless device that is Wi-Fi Direct connected to the MFP.