Analysis, Modification, and Implementation (AMI) of Scheduling Algorithm for the IEEE 802.116e (Mobile WiMAX)
C. Ravichandiran, C. Pethuru Raj, V. Vaidhyanathan
备注：
Pages IEEE format, International Journal of Computer Science and Information Security, IJCSIS, Vol. 7 No. 2, February 2010, USA. ISSN 1947 5500, http://sites.google.com/site/ijcsis/
Mobile WiMAX (Worldwide Interoperability for Microwave Access) is being touted as the most promising and potential broadband wireless technology. And the popularity rate has been surging to newer heights as the knowledge-backed service era unfolds steadily. Especially Mobile WiMAX is being projected as a real and strategic boon for developing counties such as India due to its wireless coverage acreage is phenomenally high. Mobile WiMAX has spurred tremendous interest from operators seeking to deploy high-performance yet cost-effective broadband wireless networks. The IEEE 802.16e standard based Mobile WiMAX system will be investigated for the purpose of Quality of Service provisioning. As a technical challenge, radio resource management will be primarily considered and main is the costly spectrum and the increasingly more demanding applications with ever growing number of subscribers. It is necessary to provide Quality of Service (QoS) guaranteed with different characteristics. As a possible solution the scheduling algorithms will be taken into main consideration and the present well known algorithms will be described. In this paper, we have highlighted the following critical issues for Mobile WiMAX technologies. This paper specifically discussed about the below mentioned in detail. - QoS Requirements For IEEE 802.16 Service Classes, Achieving efficient radio resource management. - Deficit Round Robin (DRR) Scheduling algorithm. - Modified Deficit Round Robin (MDRR) scheduling algorithm's attributes, properties and architecture. System Model And Scenarios Using OPNET Modeler Software. - Simulation Limitations And Constraints.
A Heuristic EDF Uplink Scheduler for Real Time Application in WiMAX Communication
WiMAX（Worldwide Interoperability for Microwave Access，全球微波接入互操作性）是一种正在发展的无线通信方案，能够提供大范围覆盖的宽带接入。WiMAX属于IEEE-802.16标准族。为了满足用户需求并支持一组新的实时的业务和应用，必须有一个现实的和动态的资源分配算法。最有效的算法之一是EDF（最早期限优先）。但问题是，当最后期限之间的差异足够大时，低优先级队列必须挨饿。因此，本文提出了一种启发式的最早截止时间优先（H-EDF）方法的WiMAX实时的系统的上行链路调度。该H-EDF提出了用于上行链路的带宽的有效分配的方式，使得带宽利用是适当的并且向系统提供适当的公平性。我们使用Opnet仿真器来实现WiMAX网络，该网络使用这种H-EDF调度算法。我们将分析性能的H-EDF算法的吞吐量以及延迟的参与考虑。
Performance Analysis of VoIP Traffic in WiMAX using various Service Classes
全球微波接入互操作性（Worldwide Interoperability for Microwave Access，WiMAX）是目前无线领域最热门的技术之一，它是基于IEEE 802.16无线技术的标准，能够提供长距离的高吞吐量宽带连接，支持点到多点（Point to MultiPoint，PMP）宽带无线接入。与此同时，基于互联网协议的语音是一种很有前途的新技术，它提供了基于互联网协议的网络上的语音通信的访问，它成为一个替代公共交换电话网，由于其传输语音的能力，作为分组在IP网络。因此，VoIP在很大程度上不能容忍延迟，因此它需要高优先级传输。在本文中，我们研究了最常见的VoIP编解码器，这是G711，G7231和G729在WiMAX网络使用各种服务类和NOAH作为传输协议的性能。为了分析QoS参数，使用流行的网络模拟器ns2。分析了决定实际应用场景和业务流的QoS的各种参数。我们的目标是比较不同类型的服务类的QoS参数，如吞吐量，平均抖动和平均延迟。
