發(fā)布時間：2018-10-30 10:36

【摘要】：信息及通信技術(shù)(Information and Communication Technologies,ICT)領域的節(jié)能問題已成為當前業(yè)界和學術(shù)界研究的熱點問題。作為信息與通信技術(shù)領域能量消耗主要來源之一,無線局域網(wǎng)(Wireless Local Area Networks,WLAN)的節(jié)能問題更加引人關(guān)注�，F(xiàn)如今,隨著智能手機、平板設備等無線設備的普及,無線數(shù)據(jù)業(yè)務量飆升,WLAN接入點(Access Point,AP)數(shù)目急速增長,在為終端用戶提供便捷的網(wǎng)絡接入服務的同時,帶來大量的電力能源消耗。IEEE 802.11n協(xié)議由于實現(xiàn)物理層和MAC層的改進優(yōu)化,極大地提高的了用戶的傳輸速率,成為WLAN的主流協(xié)議方案,配備于大量的WLAN設備上。對于WLAN節(jié)能技術(shù)的研究,特別對基于IEEE 802.11n協(xié)議無線局域網(wǎng)AP設備的節(jié)能技術(shù)研究,能夠為網(wǎng)絡運營商帶來實際的成本降低,對于ICT領域以及全球的節(jié)能進程都有著積極的作用,具有很高的研究價值和研究意義。本文旨在研究基于IEEE 802.11n協(xié)議的節(jié)能機制,從運營商的角度出發(fā),節(jié)能目標為廣泛部署的WLAN中的AP節(jié)點。通過研究使AP節(jié)點能耗降低,能效提升的機制,降低整個WLAN及無線接入網(wǎng)的能耗,提升其能量效率。本文首先通過對WLAN設備能耗模型的建模和分析,提出了評估設備能耗的標準,分別用平均能耗和單位能耗表征設備的能耗和能效性能。從理論上詳細分析了設備能耗的計算方法,給出基于IEEE 802.11n協(xié)議的WLAN設備能耗計算理論模型。其次針對WLAN無線接入點提出了適用于IEEE 802.11n協(xié)議的自適應傳輸功率控制機制(Adaptive Transmission Power Control Mechanism,A-TPCM)。A-TPCM的主旨是通過信道估計調(diào)整WLAN設備的傳輸功率,使WLAN設備能夠在傳輸狀態(tài)時使用較低的傳輸功率,同時實現(xiàn)在不同信道條件下自適應的調(diào)整傳輸功率。A-TPCM針對IEEE 802.11n協(xié)議,引入子幀錯誤概率的概念,采用對Block ACK統(tǒng)計處理的方式進行信道估計,不需要修改現(xiàn)有協(xié)議,可以方便的應用于WLAN設備。A-TPCM的優(yōu)勢還在于其既支持802.11n的AP設備的節(jié)能,對用戶側(cè)設備也同樣適用,并且向后兼容于IEEE 802.11a/b/g設備。最后,本文利用OPNET軟件設計和實現(xiàn)了WLAN設備的仿真模型,對A-TPCM的性能進行了驗證。結(jié)果表明,在不同的仿真場景中,A-TPCM都有效的降低了WLAN設備的能量消耗,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.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN925.93

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本文編號：2299763