Scheduling and Resource Allocation for SVC Streaming over OFDM Downlink Systems

info:eu-repo/semantics/publishe

Playback delay and interruption analysis of multiuser video streaming systems

Playback delay control is an important mechanism to avoid jitter in video streaming systems. This work introduces a playback delay minimization problem for multiuser video streaming systems providing a jitter-free video streaming service to end users in the system. We first analyze the case where the video requests of the users arrive to server at the same time in other words video requests are synchronized. Then we extend our analysis to case of asynchronised video requests where the number of users varies by the time In particular, a necessary condition on the playback delay for jitter-free streaming is obtained. Then, based on the derived necessary condition, an optimum rate splitting algorithm that splits available rate to all users is proposed. The proposed algorithm is optimum in the sense that it achieves the minimum system delay, which is defined as the maximum of all initial playback delays, while ensuring jitter-free streaming service to all users. Finally, using these results, an expression for the minimum system delay as a function of system parameters such as total rate, arrival times and playback curves of requested video files is also derived

Cache-Aided Non-Orthogonal Multiple Access

In this paper, we propose a novel joint caching and non-orthogonal multiple access (NOMA) scheme to facilitate advanced downlink transmission for next generation cellular networks. In addition to reaping the conventional advantages of caching and NOMA transmission, the proposed cache-aided NOMA scheme also exploits cached data for interference cancellation which is not possible with separate caching and NOMA transmission designs. Furthermore, as caching can help to reduce the residual interference power, several decoding orders are feasible at the receivers, and these decoding orders can be flexibly selected for performance optimization. We characterize the achievable rate region of cache-aided NOMA and investigate its benefits for minimizing the time required to complete video file delivery. Our simulation results reveal that, compared to several baseline schemes, the proposed cache-aided NOMA scheme significantly expands the achievable rate region for downlink transmission, which translates into substantially reduced file delivery times.Comment: Accepted for presentation at IEEE ICC 201