本文選題：無(wú)線局域網(wǎng) + 信道綁定��； 參考：《西安電子科技大學(xué)》2015年碩士論文

【摘要】：隨著新一代無(wú)線局域網(wǎng)的發(fā)展,具有不同工作頻帶的基本服務(wù)集(Basic Service System,BSS)的重疊現(xiàn)象將變得越來(lái)越普遍。在IEEE802.11ac中,主信道不同的相鄰BSS可以在各自的主信道上進(jìn)行控制幀的交互,然后利用靜態(tài)或動(dòng)態(tài)信道綁定技術(shù)綁定可用的子信道進(jìn)行數(shù)據(jù)的傳輸,但是這兩種信道綁定機(jī)制都會(huì)帶來(lái)次信道上的隱藏終端問題,此時(shí)數(shù)據(jù)的碰撞會(huì)導(dǎo)致頻譜資源的浪費(fèi);另一方面如果相鄰的BSS主信道相同時(shí),根據(jù)IEEE802.11ac協(xié)議,當(dāng)主信道被占用時(shí),802.11ac的BSS內(nèi)所有擴(kuò)展頻帶必須保持空閑狀態(tài),從而導(dǎo)致頻譜資源的浪費(fèi)。因此,在不同協(xié)議標(biāo)準(zhǔn)的網(wǎng)絡(luò)設(shè)備共存并相互交疊的密集網(wǎng)絡(luò)環(huán)境下,研究相應(yīng)的MAC設(shè)計(jì)方案來(lái)提高頻譜資源的利用率進(jìn)而提高系統(tǒng)的吞吐量顯得尤為重要。針對(duì)主信道不同時(shí)對(duì)抗重疊基本服務(wù)集(Overlap BSS,OBSS)引起的頻譜利用率不足問題,本文分析了802.11ac中的拓展連續(xù)信道綁定機(jī)制,比較分析了靜態(tài)、動(dòng)態(tài)信道綁定機(jī)制的性能,在此基礎(chǔ)上針對(duì)連續(xù)信道綁定機(jī)制中出現(xiàn)的次信道隱藏終端問題引出增強(qiáng)型保護(hù)機(jī)制,最后介紹一種基于增強(qiáng)型保護(hù)信道綁定接入機(jī)制的介質(zhì)訪問控制層(Medium Access Control,MAC)方案,以解決主信道不同時(shí)OBSS引起的頻譜利用率不足問題。仿真結(jié)果表明,具有增強(qiáng)型保護(hù)功能的MAC設(shè)計(jì)方案可以有效地緩解次信道隱藏終端問題,避免不必要的碰撞,進(jìn)一步提高網(wǎng)絡(luò)吞吐量。針對(duì)主信道相同時(shí)對(duì)抗OBSS引起的頻譜利用率不足問題,本文首先分析了802.11ac協(xié)議下OBSS系統(tǒng)的性能,在此基礎(chǔ)上提出了一種基于虛擬主信道的信道接入方案,來(lái)優(yōu)化系統(tǒng)的性能。該方案能夠使得802.11ac設(shè)備在主信道被占用的情況下在其拓展頻帶上進(jìn)行數(shù)據(jù)傳輸。仿真結(jié)果表明提出的基于虛擬主信道的信道接入方案大大提高了OBSS系統(tǒng)的頻譜利用率。
[Abstract]:With the development of the new generation of WLAN, the overlap of basic Service system (BSS) with different operating bands will become more and more common. In IEEE802.11ac, adjacent BSS with different primary channels can interact with control frames on their respective primary channels, and then bind the available subchannels to transmit data using static or dynamic channel binding techniques. However, these two channel binding mechanisms will bring hidden terminal problems on the secondary channel, and the collision of the data will lead to the waste of spectrum resources. On the other hand, if the adjacent BSS primary channel is the same, according to the IEEE802.11ac protocol, When the primary channel is occupied, all the extended frequency bands in the BSS of 802.11ac must remain idle, which leads to the waste of spectrum resources. Therefore, in the dense network environment where the network equipment of different protocol standards coexist and overlap with each other, it is particularly important to study the corresponding MAC design scheme to improve the utilization of spectrum resources and the throughput of the system. In order to solve the problem of insufficient spectrum efficiency caused by overlap BSS), this paper analyzes the extended continuous channel binding mechanism in 802.11ac, and compares the performance of static and dynamic channel binding mechanisms. On the basis of this, the enhanced protection mechanism is introduced in view of the problem of the hidden terminal in the secondary channel in the continuous channel binding mechanism. Finally, a medium Access Control (MAC) scheme based on the enhanced protection channel binding access mechanism is introduced. In order to solve the problem of spectrum utilization caused by OBSS with different primary channels. The simulation results show that the scheme of MAC with enhanced protection can effectively alleviate the problem of hidden terminal in sub-channel, avoid unnecessary collisions, and further improve the throughput of the network. In order to solve the problem of insufficient spectrum utilization caused by OBSS when the primary channel is the same, this paper first analyzes the performance of OBSS system under 802.11ac protocol, and then proposes a channel access scheme based on virtual primary channel to optimize the performance of the system. This scheme enables the 802.11ac device to transmit data over its extended frequency band when the primary channel is occupied. Simulation results show that the proposed channel access scheme based on virtual primary channel greatly improves the spectrum efficiency of OBSS system.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN925.93

【參考文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前2條

1 王紅香;基于信道綁定的WLAN高效MAC協(xié)議研究[D];西安電子科技大學(xué);2013年

2 楊茂彬;基于IEEE 802.11技術(shù)的無(wú)線局域網(wǎng)通信協(xié)議的研究[D];東南大學(xué);2004年

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本文編號(hào)：1964358