无线局域网功率控制节能机制研究

发布时间：2018-10-30 10:36

【摘要】：信息及通信技术(Information and Communication Technologies,ICT)领域的节能问题已成为当前业界和学术界研究的热点问题。作为信息与通信技术领域能量消耗主要来源之一,无线局域网(Wireless Local Area Networks,WLAN)的节能问题更加引人关注。现如今,随着智能手机、平板设备等无线设备的普及,无线数据业务量飙升,WLAN接入点(Access Point,AP)数目急速增长,在为终端用户提供便捷的网络接入服务的同时,带来大量的电力能源消耗。IEEE 802.11n协议由于实现物理层和MAC层的改进优化,极大地提高的了用户的传输速率,成为WLAN的主流协议方案,配备于大量的WLAN设备上。对于WLAN节能技术的研究,特别对基于IEEE 802.11n协议无线局域网AP设备的节能技术研究,能够为网络运营商带来实际的成本降低,对于ICT领域以及全球的节能进程都有着积极的作用,具有很高的研究价值和研究意义。本文旨在研究基于IEEE 802.11n协议的节能机制,从运营商的角度出发,节能目标为广泛部署的WLAN中的AP节点。通过研究使AP节点能耗降低,能效提升的机制,降低整个WLAN及无线接入网的能耗,提升其能量效率。本文首先通过对WLAN设备能耗模型的建模和分析,提出了评估设备能耗的标准,分别用平均能耗和单位能耗表征设备的能耗和能效性能。从理论上详细分析了设备能耗的计算方法,给出基于IEEE 802.11n协议的WLAN设备能耗计算理论模型。其次针对WLAN无线接入点提出了适用于IEEE 802.11n协议的自适应传输功率控制机制(Adaptive Transmission Power Control Mechanism,A-TPCM)。A-TPCM的主旨是通过信道估计调整WLAN设备的传输功率,使WLAN设备能够在传输状态时使用较低的传输功率,同时实现在不同信道条件下自适应的调整传输功率。A-TPCM针对IEEE 802.11n协议,引入子帧错误概率的概念,采用对Block ACK统计处理的方式进行信道估计,不需要修改现有协议,可以方便的应用于WLAN设备。A-TPCM的优势还在于其既支持802.11n的AP设备的节能,对用户侧设备也同样适用,并且向后兼容于IEEE 802.11a/b/g设备。最后,本文利用OPNET软件设计和实现了WLAN设备的仿真模型,对A-TPCM的性能进行了验证。结果表明,在不同的仿真场景中,A-TPCM都有效的降低了WLAN设备的能量消耗,提升了其能量效率。
[Abstract]:Energy saving in the field of information and communication technology (Information and Communication Technologies,ICT) has become a hot issue in industry and academia. As one of the main sources of energy consumption in the field of information and communication technology (Wireless Local Area Networks,WLAN), the energy saving problem of WLAN (WLAN) becomes more and more attractive. Nowadays, with the popularity of wireless devices such as smart phones and tablet devices, the volume of wireless data services has soared, and the number of WLAN access points (Access Point,AP) has increased rapidly, providing convenient network access services for end users at the same time. IEEE 802.11n protocol, which realizes the improvement and optimization of physical layer and MAC layer, greatly improves the transmission rate of users and becomes the mainstream protocol scheme of WLAN, which is equipped with a large number of WLAN devices. For the research of WLAN energy-saving technology, especially for the research of IEEE 802.11n wireless LAN AP equipment, it can bring the actual cost reduction for network operators. It plays an active role in the field of ICT and the global energy saving process, and has high research value and significance. The purpose of this paper is to study the energy-saving mechanism based on IEEE 802.11n protocol. From the point of view of the operator, the energy saving target is the AP node in the widely deployed WLAN. By studying the mechanism of reducing energy consumption and improving energy efficiency of AP nodes, the energy consumption of the whole WLAN and wireless access network is reduced, and its energy efficiency is improved. Based on the modeling and analysis of the energy consumption model of WLAN equipment, this paper puts forward a standard to evaluate the energy consumption of the equipment. The average energy consumption and the unit energy consumption are used to characterize the energy consumption and energy efficiency performance of the equipment, respectively. The calculation method of equipment energy consumption is analyzed in detail theoretically, and the theoretical model of WLAN device energy consumption calculation based on IEEE 802.11n protocol is presented. Secondly, an adaptive transmission power control mechanism (Adaptive Transmission Power Control Mechanism,A-TPCM) for WLAN wireless access points is proposed for IEEE 802.11n protocol. The main purpose of A-TPCM is to adjust the transmission power of WLAN devices through channel estimation. The WLAN device can use lower transmission power in transmission state, and realize adaptive adjustment of transmission power under different channel conditions. A-TPCM introduces the concept of sub-frame error probability for IEEE 802.11n protocol. The channel estimation based on Block ACK statistical processing can be easily applied to WLAN devices without modifying the existing protocols. The advantage of A-TPCM is that it not only supports the energy saving of 802.11n AP devices, but also applies to user side devices. And backward compatible with IEEE 802.11a/b/g devices. Finally, the simulation model of WLAN equipment is designed and implemented by using OPNET software, and the performance of A-TPCM is verified. The results show that in different simulation scenarios, A-TPCM can effectively reduce the energy consumption of WLAN equipment and improve its energy efficiency.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN925.93

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