Scalable video multicast with joint resource allocation and Adaptive Modulation and Coding over multiple base station networks

摘要

Video multicast exploits the wireless broadcast nature to transmit a video stream to multiple clients with a minimum bandwidth requirement. Scalable video coding (AMC) and Adaptive Modulation and Coding (AMC) are two key techniques for video multicast in broadband wireless networks. They improve the system utility value by dividing the video steam into different layers and assigning appropriate modulation and coding schemes (MCS) to each layer. With the development of mobile communication, all kinds of multiple access interference technology have been studied profound which make the multi-base station cooperative transmission possible. This paper presents a joint Slot-allocation and MCS-selection scheme in multi-base station system model. We first formulate the problem as maximizing the total system utility, where the utility of each user is a generic non-negative, non-decreasing function of received rate, which can be proven to be a NP-hard optimization problem. Then an intra-session MCS assignment method based on greedy algorithm is proposed, which can be also applied to muti-session scenarios. Simulation results show that our algorithm keeps good performance compared with the optimal result, and outperforms other competing schemes of single-base station system.