Utility based optimized cross-layer scheduling for real-time video over HSDPA
Utility based optimized cross-layer scheduling for real-time video over HSDPA
复制标题
DOI：
10.1109/icccn.2014.6911776
复制
发表时间：
2014-08
期刊：
影响因子：
--
通讯作者：
Rui Deng;Guizhong Liu;Jian Yang
中科院分区：
文献类型：
--
作者：
Rui Deng;Guizhong Liu;Jian Yang
在本文中，我们研究了基于效用优化的跨层多用户调度的实时视频传输在HSDPA。这里的效用指的是分组效用，其被定义为分组紧急性和分组重要性的函数。在每个TTI中首先发送具有更大效用值的分组可以为用户提供更高水平的满意度（视频质量）。因此，我们制定了一个优化问题，其目标是最大限度地提高聚合数据包的效用在所有用户的HSDPA物理层的限制。采用动态规划方法，可以得到最优的分组调度策略。针对其高复杂度，我们进一步发展了一种次优解的方法--贪婪算法。仿真结果表明，提出的调度算法可以提供更高的接收视频质量比现有的HSDPA视频传输。
In this paper we study a utility based optimized cross-layer multiuser scheduling for real-time video transmission over HSDPA. The utility here refers to the packet utility which is defined as a function of the packet urgency and the packet importance. Transmitting the packets with greater utility values firstly in each TTI can provide a higher level of satisfaction (video quality) for the users. Thus, we formulate an optimization problem with the objective of maximizing the aggregate packet utility over all the users under the HSDPA physical layer constraints. By employing the dynamic programming method, an optimal packet scheduling strategy can be obtained. In view of its high complexity, we further develop a method of suboptimal solution, the greedy algorithm. Simulation results show that the proposed scheduling algorithms can provide higher received video quality than the existing ones for video transmission over HSDPA.