基于qos感知的IEEE 802.16下行子帧映射方案研究

P. Sarigiannidis, M. Louta, D. Stratogiannis, Georgios I. Tsiropoulos
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引用次数: 10

摘要

IEEE 802.16 (WiMAX)被认为是支持高容量和远距离通信以及用户移动性的最有前途的无线接入技术之一。在多址通信环境中应该解决的一个问题是如何有效地容纳下行链路子帧的流量请求。下行子帧的分配操作没有标准化,只是对下行子帧带宽的使用进行了限制。最值得注意的限制是矩形限制,要求所有下行链路分配以二维矩形形状映射。本研究是定义qos感知映射方案的第一步,该方案根据严格的延迟要求对流量请求进行优先级排序。该制图方案应用了视界调度,允许以一种有效和简单的方式安排爆发,跟随视界作为飞行员。通过仿真实验对qos感知映射方案进行了评价,结果表明,该方案通过减少未服务用户和流量请求数量,以及减少实时流量的比例,有效地运行了qos感知映射方案。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Towards a QoS-Aware IEEE 802.16 downlink sub-frame mapping scheme
IEEE 802.16 (WiMAX) is considered as one of the most promising wireless access technologies supporting high-capacity and long-distance communications as well as user mobility. A problem that should be addressed in the context of multi-access communications is the efficient accommodation of traffic requests to the downlink subframe. The allocation operation in downlink sub-frame is not standardized, while only restrictions on the usage of downlink sub-frame's bandwidth are defined. The most noticeable restriction is the rectangular restriction, requiring all downlink allocations to be mapped in a two-dimensions rectangular shaping. This study is a first step towards defining a QoS-aware mapping scheme, prioritizing traffic requests in accordance with the strict delay requirements they pose. The mapping scheme applies horizon scheduling, permitting bursts to be scheduled efficiently and in a simple way, following the horizons as pilots. The QoS-aware mapping scheme is evaluated by means of simulation experiments, which indicate that the proposed scheme operates effectively and efficiently, by reducing the number of unserviced users and traffic requests, and the portion of the dropped real-time traffic.
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