OFDMA resource allocation for multicasting videos to users with diverse screen sizes

This paper proposes a resource allocation algorithm for multicasting video streams to users with diverse screen sizes. In order to gain from multicasting, quality of the channel has to be sufficiently high for the all users, and probability that such channel happens become lower as the number of the users grows. Therefore, this paper considers orthogonal frequency division multiple access (OFDMA) to solve the problem by individually allocating power and subset of the users to each OFDMA component carrier (CC). For the video streams, we consider scalable video coding (SVC) which provides adaptabilities in channel environment and also provides multiple resolutions. The proposed resource allocation algorithm considers minimum bit rate for each user in order to guarantee minimum video quality. In addition, the algorithm considers maximum bit rate according to the screen size of each user in order to utilize the given bandwidth and power resources more efficiently.