Abstract: A portable electronic device is provided. The portable electronic device includes a communication interface, a memory configured to store multimedia data obtained through at least one camera operatively connected with the memory, and a processor. The processor is configured to transmit at least part of the multimedia data to an external electronic device through a network using a first transmit power function of the portable electronic device, through the communication interface, to determine context information associated with at least one of the portable electronic device and the network, and to change from the first transmit power function to a second transmit power function of the portable electronic device if the context information corresponds to a condition.

Abstract: An electronic device is provided. The electronic device includes a display configured to output an image, a transceiver configured to establish a plurality of channels with an external electronic device, and a processor configured to classify a virtual three dimensional (3D) projection space around the electronic device into a plurality of regions, link each of the plurality of regions with one of the plurality of channels, receive image data over the channel linked to each of the plurality of regions via the transceiver from the external electronic device, and output a streaming image on the display based on the image data.

Abstract: A portable electronic device is provided. The portable electronic device includes a communication interface, a memory configured to store multimedia data obtained through at least one camera operatively connected with the memory, and a processor. The processor is configured to transmit at least part of the multimedia data to an external electronic device through a network using a first transmit power function of the portable electronic device, through the communication interface, to determine context information associated with at least one of the portable electronic device and the network, and to change from the first transmit power function to a second transmit power function of the portable electronic device if the context information corresponds to a condition.

Abstract: Disclosed are an apparatus and a method for receiving layered data transmitted over a multiple multicast channel. The layered data receiving method includes receiving the data including a count number, arranging the received data in an order of reception and storing in a jitter buffer, rearranging the data in an order of the count number and storing in a data buffer.

Abstract: A client apparatus and method using a multimedia streaming service supporting technology that controls streaming communication with a streaming server on the basis of a buffer level independently from a pause/resuming input of a user are provided. The method includes: measuring a buffer level of a buffer of a streaming client which temporarily stores streaming data received from a streaming server; and controlling, independently from a user's input, streaming communication with the streaming server according to the measured buffer level.

Abstract: The present invention relates to a system for measuring image quality of moving pictures. The system comprises a transmitter, for transmitting encoded image data through a channel, and a receiver, for receiving the encoded image data and analyzing image information from the received image data to measure the image quality of moving pictures. The receiver includes a reception data input unit for receiving the encoded image data, a reception information analysis unit for analyzing a bitstream from the received image data in order to extract image information including loss or non-loss, a motion vector, and coordinates of each block, and an image quality measurement unit for applying a weight to each block by using the extracted image information and calculating the number of lost blocks reflecting weights to measure image quality.