Camera system and method of controlling the same

1. A camera system comprising:

a radio frequency (RF) module connected to a gateway through a channel, and configured to receive, from the gateway, a beacon comprising channel information about a next channel for connection to the gateway; and

a controller configured to compare a number of beacon reception failures with a reference number in response to failing to receive the beacon at the RF module, set the channel to a predetermined channel for connection to the gateway if the number of beacon reception failures is greater than or equal to the reference number, and change the channel to the next channel in response to receiving the beacon.

2. The camera system of claim 1 , wherein the predetermined channel is a channel with lowest interference from among a plurality of channels for connection to the gateway.

3. The camera system of claim 1 , further comprising a memory configured to store channel information about a plurality of channels for connection to the gateway in a predetermined order of the plurality of channels, and

wherein, in response to the receiving the beacon, the controller is configured to change the channel to another channel among the plurality of channels in the predetermined order.

4. The camera system of claim 3 , wherein after setting the channel to the predetermined channel, if the RF module receives the beacon comprising channel information about a channel next to the predetermined channel according to the channel information about the plurality of channels, the controller is configured to change the predetermined channel to the channel next to the predetermined channel.

5. The camera system of claim 3 , wherein the reference number is equal to or less than a number of the plurality of channels.

6. The camera system of claim 3 , wherein the channel information about the plurality of channels is updated such that the predetermined order is changed or an existing channel among the plurality of channel is replaced by a different channel not included in the plurality of channels.

7. The camera system of claim 6 , wherein the controller is configured to apply the updated channel information for connection to the gateway after the channel is changed to the last channel among the plurality of channels in the predetermined order.

8. The camera system of claim 1 , wherein the controller is further configured to transmit a channel check request to the gateway in response to failing to receive the beacon, receive a channel check response that corresponds to the channel check request from the gateway through the RF module, and change the channel according to channel information about a different channel included in the channel check response.

9. The camera system of claim 8 , wherein the controller is configured to transmit the channel check request and receive the channel check response within a beacon interval time.

10. The camera system of claim 1 , wherein if the number of beacon reception failures is less than the reference number, the controller is configured to change the channel to another channel in a predetermined order of a plurality of channels.

11. The camera system of claim 10 , further comprising the gateway which stores a channel table comprising channel information about the plurality of channels in the predetermined order, and

wherein the gateway is configured to transmit the beacon to the RF module based on the channel table.

12. A camera comprising:

a radio frequency (RF) module connected to a gateway through a channel, and configured to receive a beacon periodically sent from the gateway, the beacon comprising channel information about a next channel to which the channel is to be changed for connecting the camera and the gateway; and

a controller configured to determine whether the beacon is received at the RF module, and change the channel to another channel based on at least one of:

a predetermined order of a plurality of channels including the other channel;

a status of receiving the beacon at the RF module; and

a channel check response received from the gateway in response to a channel check request sent from the radio frequency module, the channel check response comprising channel information about one of the plurality of channels.

13. The camera of claim 12 , wherein the controller is further configured to determine a number of failures in receiving the beacon, and change the channel to the other channel in a different manner according to the number of failures.

14. The camera of claim 13 , wherein, if the number of failures is less than a reference number, the controller changes the channel to the other channel in the predetermined order of the plurality of channels, and

wherein, if the number of failures is greater than or equal to the reference number, the controller sets the channel to a predetermined channel among the plurality of channels until the beacon comprising channel information about the predetermined channel is received at the RF module.

15. The camera of claim 12 , wherein the controller is configured to determine occurrence of at least one failure in receiving the beacon, and

wherein if the controller determines the occurrence of the failure, the controller changes the channel to one of:

a predetermined channel selected from among the plurality of channels;

a channel which is to be selected according to the predetermined order when the failure does not occur; and

the one of the plurality of channels of which the channel information is included the channel check response.

16. The camera of claim 12 , wherein the controller is further configured to update the channel information about the plurality of channels such that the predetermined order is changed or an existing channel among the plurality of channel is replaced by a different channel not included in the plurality of channels.

17. A method of changing a channel through which a camera is connected to a gateway, the method comprising:

receiving a beacon which is periodically sent from the gateway and comprises channel information about a next channel to which the channel is to be changed for connecting the camera and the gateway; and

determining whether the beacon is received at the RF module, and changing the channel to another channel based on at least one of:

a predetermined order of a plurality of channels including the other channel;

a status of receiving the beacon at the RF module; and

a channel check response received from the gateway in response to a channel check request sent from the radio frequency module, the channel check response comprising channel information about one of the plurality of channels.

18. The method of claim 17 , further comprising:

determining a number of failures in receiving the beacon; and

changing the channel to the other channel in a different manner according to the number of failures.

19. The method of claim 18 , wherein, if the number of failures is less than a reference number, the channel is changed to the other channel in the predetermined order of the plurality of channels, and

wherein, if the number of failures is greater than or equal to the reference number, the channel is set to a predetermined channel among the plurality of channels until the beacon comprising channel information about the predetermined channel is received at the RF module.

20. The method of claim 17 , further comprising determining occurrence of at least one failure in receiving the beacon,

wherein in response to determining that the occurrence of the failure, the channel is changed to one of:

a predetermined channel selected from among the plurality of channels;

a channel which is to be selected according to the predetermined order when the failure does not occur; and

the one of the plurality of channels of which the channel information is included the channel check response.