Scheduling Techniques for Improving Call Capacity for VoIP Traffic in MIMO-OFDMA Networks
Scheduling Techniques for Improving Call Capacity for VoIP Traffic in MIMO-OFDMA Networks
复制标题
提高 MIMO-OFDMA 网络中 VoIP 流量呼叫容量的调度技术
DOI：
10.1109/vetecf.2009.5378894
复制
发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Yong Sun
中科院分区：
文献类型：
--
作者：
M. Nicolaou;A. Doufexi;S. Armour;Yong Sun
第四代网络将几乎不可避免地采用OFDMA（正交频分多址）和MIMO（多输入多输出）技术，以满足高数据速率和服务质量（QoS）要求。基于IEEE 802.16标准的全球微波接入互操作性（WiMAX）MAC层被设计为支持各种应用，包括语音和多媒体服务。在宽带无线系统中提供QoS的问题是有效管理无线资源的问题之一。需要开发有效的调度算法，以平衡每个应用程序和用户的QoS要求与可用的无线电资源。本文考虑了一些调度策略集中在实时IP语音（VoIP）流量。通过数值计算结果，我们表明，传统的公平性的概念无法保证服务的低延迟应用，如VoIP的流量负载不断增加。我们表明，更好的QoS是通过一个贪婪的调度方法，管理服务数据包更快。
Fourth Generation Networks will almost invariably adopt OFDMA (Orthogonal Frequency Division Multiple Access) and MIMO (Multiple Input-Multiple Output technologies, in order to meet high data rate and Quality of Service (QoS) requirements. The Worldwide Interoperability for Microwave Access (WiMAX) MAC Layer, which is based on the IEEE 802.16 standard, is designed to support a variety of applications, including voice and multimedia services. The problem of providing QoS in broadband wireless systems is one of managing radio resources effectively. Efficient scheduling algorithms that balance the QoS requirements of each application and user with the available radio resources need to be developed. This paper considers a number of scheduling policies concentrating on real-time Voice over IP (VoIP) traffic. Via numerical results we show that the conventional notion of fairness fails to guarantee service for low latency applications such as VoIP for an increasing traffic load. We show better QoS is achieved via a greedy scheduling approach that manages to serve packets faster.