MAC层协作的IEEE802.11ah吞吐量增强方案研究

Throughput Enhancement Schemes for IEEE 802.11ah based on Multi-layer Cooperation

针对传统IEEE 802. 11ah的传输指示映射(Traffic Indication Map,TIM)在提升系统性能方面效率较低的问题,利用MAC层协作的帧结构修改方法,分析和改进了三级分层TIM压缩编码结构,以有效支持未来大规模物联网通信的场景。研究和分析结果表明所改进方案在兼容现有IEEE802. 11ah等标准的基础上有效提升了系统的传输效率,通过选择不同的编码控制方式可有效的缩短各种情况下的TIM指示长度,其中压缩TIM指示长度不仅可有效节省TIM点阵图空间,而且帧结构更合理。最后,仿真结果和分析表明所改进方案的位映射长度相比于传统方案可获得更高的性能增益。

Aiming to the traditional IEEE 802.11 ah Traffic Indication Map(TIM)inefficiencies in improving systemperformance#with the method of modifying the frame structure of the cooperation of the MAC layer,a three-layer hierarchical TIM compression coding structure was analyzed and improved to effectively support the future of large-scale IoT communication scenarios.The proposed scheme effectively improves the transmission efficiency of the systemon the basis of compatibility with the existing standards.The scheme can effectively shorten the TIM indication length under various situations by selecting different coding control modes.The compressed TIM indication length not only can effectively save the TIM bitmap space#but also has more reasonable structure.Simulation and analysis show that the proposed scheme can obtain better system performance than the traditional scheme.