Wireless Broadband Access: WiMAX and Beyond - Investigation of Bandwidth Request Mechanisms under Point-to-Multipoint Mode of WiMAX Networks
Wireless Broadband Access: WiMAX and Beyond - Investigation of Bandwidth Request Mechanisms under Point-to-Multipoint Mode of WiMAX Networks
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无线宽带接入：WiMAX 及其他 - WiMAX 网络点对多点模式下的带宽请求机制研究
DOI：
10.1109/mcom.2007.358860
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
Tao Jiang
中科院分区：
文献类型：
--
作者：
Q. Ni;A. Vinel;Yang Xiao;A. Turlikov;Tao Jiang
WiMAX标准规定了城域宽带无线接入空中接口。为了支持多媒体应用的QoS，WiMAX中提出了各种带宽请求和调度机制，其中用户站可以向基站发送请求消息，并且基站可以根据可用的无线电资源来准许或拒绝该请求。本文首先比较了标准中规定的两种基本带宽请求机制，即点对多点模式（一种强制传输模式）下的随机接入与轮询。我们的研究结果表明，随机访问优于轮询时，请求率低。然而，当信道拥塞时，其性能会显着下降。根据负载在随机接入和轮询之间进行自适应切换可以提高系统性能。我们还研究了信道噪声对随机接入请求机制的影响
The WiMAX standard specifies a metropolitan area broadband wireless access air interface. In order to support QoS for multimedia applications, various bandwidth request and scheduling mechanisms are suggested in WiMAX, in which a subscriber station can send request messages to a base station, and the base station can grant or reject the request according to the available radio resources. This article first compares two fundamental bandwidth request mechanisms specified in the standard, random access vs. polling under the point-to-multipoint mode, a mandatory transmission mode. Our results demonstrate that random access outperforms polling when the request rate is low. However, its performance degrades significantly when the channel is congested. Adaptive switching between random access and polling according to load can improve system performance. We also investigate the impact of channel noise on the random access request mechanism