發(fā)布時(shí)間：2018-03-18 20:31

  本文選題：802.11　切入點(diǎn)：低功耗功率控制　出處：《南京理工大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著Wi-Fi技術(shù)越來(lái)越普遍的應(yīng)用,Wi-Fi無(wú)線網(wǎng)卡的節(jié)能問(wèn)題慢慢得到人們的重視,而無(wú)線網(wǎng)卡傳統(tǒng)的節(jié)能技術(shù)又往往不能保證網(wǎng)卡傳輸數(shù)據(jù)狀態(tài)下的性能。針對(duì)這-技術(shù)瓶頸,本文設(shè)計(jì)了基于低功耗協(xié)議和動(dòng)態(tài)功率控制優(yōu)化算法的Wi-Fi網(wǎng)卡驅(qū)動(dòng)。 首先進(jìn)行了低功耗驅(qū)動(dòng)總體方案設(shè)計(jì),在分析了Intel6200agn Wi-Fi網(wǎng)卡硬件架構(gòu)和工作原理以及Windows網(wǎng)絡(luò)結(jié)構(gòu)下NDIS網(wǎng)絡(luò)驅(qū)動(dòng)基本結(jié)構(gòu)的基礎(chǔ)上,分三個(gè)層面設(shè)計(jì)開發(fā)了無(wú)線網(wǎng)卡驅(qū)動(dòng)的固件驅(qū)動(dòng)(fimware)和協(xié)議驅(qū)動(dòng)基礎(chǔ)框架。通過(guò)將低功耗優(yōu)化協(xié)議和動(dòng)態(tài)功率控制優(yōu)化算法融合到固件層,提高了整體網(wǎng)卡驅(qū)動(dòng)的性能,在協(xié)議驅(qū)動(dòng)上添加與上層應(yīng)用相關(guān)的查詢?cè)O(shè)置環(huán)節(jié),方便了開發(fā)者的調(diào)試和二次開發(fā)以及用戶對(duì)設(shè)備的了解和使用。 接著在網(wǎng)卡固件程序上完成了低功耗優(yōu)化協(xié)議的設(shè)計(jì)。對(duì)802.11MAC層協(xié)議進(jìn)行全面解析后,設(shè)計(jì)了兼容原始協(xié)議的二次握手機(jī)制。相對(duì)于原始協(xié)議在通信過(guò)程中只有一次RTS/CTS握手,二次握手協(xié)議為數(shù)據(jù)的低功耗傳輸建立了一個(gè)安全區(qū)域,不但不會(huì)影響第一次握手RTS/CTS所建立的保護(hù)區(qū)域,而且能將原始的信道分時(shí)復(fù)用工作機(jī)制轉(zhuǎn)變?yōu)橄鄬?duì)獨(dú)立的多小區(qū)同時(shí)并用的工作機(jī)制,從而實(shí)現(xiàn)了吞吐量的提升和網(wǎng)絡(luò)節(jié)點(diǎn)的低功耗工作的目的,克服了空間信道資源不足吞吐量無(wú)法上升的技術(shù)瓶頸和單純降低所有信息包功耗而導(dǎo)致的互擾問(wèn)題。 在固件程序上還設(shè)計(jì)了動(dòng)態(tài)功率控制優(yōu)化算法的功率控制方案,將控制理論與通信理論融合起來(lái),更好地實(shí)現(xiàn)了網(wǎng)卡節(jié)能。算法特色之處在于引入自定義的丟幀率和功率偏移量等通信質(zhì)量參數(shù)進(jìn)行合理計(jì)算分析,并將計(jì)算結(jié)果作為閉環(huán)反饋實(shí)時(shí)調(diào)整發(fā)射功率的等級(jí)。對(duì)比于原始Wi-Fi網(wǎng)卡驅(qū)動(dòng)的相對(duì)恒定的發(fā)包功率設(shè)定,本文設(shè)計(jì)的低功耗驅(qū)動(dòng)能夠根據(jù)信道通信環(huán)境動(dòng)態(tài)調(diào)整發(fā)射功率,實(shí)現(xiàn)傳輸?shù)暮侠砘凸?jié)能的最大化。 最后,完成了驅(qū)動(dòng)程序的編譯安裝調(diào)試工作,并根據(jù)測(cè)試結(jié)果進(jìn)行程序完善,提高了兼容性和可靠性。最終實(shí)際調(diào)試結(jié)果表明,該方案下所設(shè)計(jì)的Wi-Fi網(wǎng)卡驅(qū)動(dòng)程序具有低功耗高吞吐量的優(yōu)良性能。
[Abstract]:Along with the more and more widespread application of Wi-Fi technology, the energy saving problem of Wi-Fi wireless network card has been paid more and more attention, but the traditional energy saving technology of wireless network card often can not guarantee the performance of the network card under the condition of transmitting data. In this paper, Wi-Fi driver based on low power protocol and dynamic power control optimization algorithm is designed. Firstly, the overall scheme of low power driver is designed. The hardware architecture and working principle of Intel6200agn Wi-Fi network card and the basic structure of NDIS network driver under Windows network structure are analyzed. The firmware driver of wireless network card (WNIC) and the basic framework of protocol driver are designed and developed in three layers. By integrating low power optimization protocol and dynamic power control optimization algorithm into firmware layer, the performance of the whole Nic driver is improved. Adding query setting link related to the upper application on the protocol driver, it is convenient for the developer to debug and secondary development and the user to understand and use the device. After analyzing the 802.11 MAC protocol, a secondary handshake mechanism compatible with the original protocol is designed. Compared with the original protocol, there is only one RTS/CTS handshake in the communication process. The secondary handshake protocol establishes a secure area for low power transmission of data, not only does it not affect the protection area established by the first handshake RTS/CTS, Moreover, the original channel time-sharing multiplexing mechanism can be transformed into a relatively independent multi-cell simultaneous working mechanism, which can achieve the purpose of improving throughput and low power consumption of network nodes. It overcomes the technical bottleneck of insufficient throughput of space channel resources and the problem of mutual interference caused by reducing the power consumption of all packets. In the firmware program, the power control scheme of the dynamic power control optimization algorithm is also designed, which combines the control theory with the communication theory. The characteristic of the algorithm lies in the introduction of self-defined frame loss rate and power offset and other communication quality parameters for reasonable calculation and analysis. The calculation results are used as closed-loop feedback to adjust the transmission power level in real time. Compared with the relatively constant packet power setting of the original Wi-Fi network card driver, the low-power driver designed in this paper can dynamically adjust the transmission power according to the channel communication environment. Realize the rationalization of transmission and the maximization of energy saving. Finally, the compilation, installation and debugging of the driver are completed, and the program is perfected according to the test results, which improves the compatibility and reliability. Finally, the actual debugging results show that, The Wi-Fi network card driver designed under this scheme has good performance of low power consumption and high throughput.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TP334.7

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