Surveillance system including network camera and gateway and method of driving the same

A method of driving a network camera in a surveillance system, the method comprising:

• generating, at the network camera, a plurality of data packets, each data packet comprising at least one of image data and audio data;
• constituting, at the network camera, a multi-data packet comprising the data packets;
• storing at least a portion of the data packets;
• transmitting the multi-data packet to a gateway or a client device;
• and
• in response to receiving an indication that a transmission error has occurred to at least one data packet among the data packets constituting the multi-data packet, generating a target data packet comprising the data packet from the stored data packets, and transmitting the target data packet to the gateway or the client device,
• wherein the method further comprises setting, at the gateway or the client device, an operation condition of the network camera and transmitting the operation condition to the network camera,
• wherein the operation condition comprises at least one of a resolution of an image to be transmitted by the network camera, a condition of image compression performed by the network camera, a kind or type of the image to be transmitted by the network camera, and a transmission condition,
• wherein the generating the data packets comprises differently constituting at least one of the data packets according to whether the operation condition is changed by the gateway or the client device,
• wherein the generating the data packets comprises:
• in response to determining that the operation condition is not changed, generating the data packets such that each of the data packets comprises a pocket for communication comprising length information of a corresponding data packet, and a payload not having a header;
• and
• in response to determining that the operation condition is changed, generating the data packets such that at least one of the data packets comprises a payload having the header which comprises information required to restore the at least one of the image data and the audio data at the client device or the gateway,
• wherein the header comprises information required to restore the at least one of the image data and the audio data.