如今,有限的授權(quán)頻段和日益增長(zhǎng)的網(wǎng)絡(luò)服務(wù),包括視頻數(shù)據(jù)流、網(wǎng)絡(luò)游戲和網(wǎng)絡(luò)話務(wù)容量之間的矛盾已經(jīng)成為通信網(wǎng)絡(luò)最急需解決的挑戰(zhàn)。通過額外的授權(quán)頻段來增加網(wǎng)絡(luò)容量是一個(gè)切實(shí)可行的解決辦法。通過空中接口調(diào)度,LET-A頻譜效率已經(jīng)達(dá)到了最高水平,并且在密集網(wǎng)絡(luò)中表現(xiàn)出色。為了滿足新的網(wǎng)絡(luò)服務(wù)需求,將LTE-A這樣的先進(jìn)技術(shù)擴(kuò)展到非授權(quán)頻段中,是一個(gè)可能的解決方案。然而,為了使LTE-A能夠與Wi-Fi等非授權(quán)頻段中其他頻譜接入技術(shù)共存,移動(dòng)運(yùn)營(yíng)商會(huì)對(duì)LTE-A進(jìn)行少量修改。運(yùn)營(yíng)商通過改變調(diào)度信道技術(shù)或者升級(jí)核心網(wǎng)絡(luò)來修改空中接口。第二種解決方案則很少被考慮,研究機(jī)構(gòu)和標(biāo)準(zhǔn)化組織更著重于空中接口的設(shè)計(jì),而不是核心網(wǎng)絡(luò)的修改,來降低LTE-A部署在非授權(quán)頻段中的復(fù)雜性。不同的國家對(duì)非授權(quán)頻段的管理實(shí)體有不同的限制,這些限制包括傳輸功率,信道接入方法,雷達(dá)保護(hù)過程,頻段聚合,信道占用時(shí)間。雖然這些限制因國家而異,但果LTE-A需要在非授權(quán)頻譜運(yùn)行,則必須考慮到這些限制。非授權(quán)頻譜是不同技術(shù)的共享頻段;因此,在非授權(quán)頻段內(nèi)運(yùn)行,需要一種新的機(jī)制,它要求其他技術(shù)和其他運(yùn)營(yíng)商在同一頻段內(nèi)平等共存�！ぞW(wǎng)絡(luò)致... 

【文章來源】：北京郵電大學(xué)北京市 211工程院校 教育部直屬院校

【文章頁數(shù)】：128 頁

【學(xué)位級(jí)別】：博士

【文章目錄】：
摘要
ABSTRACT
Acknowledgements
LIST OF ACRONYMS
CHAPTER-1: INTRODUCTION
    1.1 LTE-A WI-FI COEXISTENCE
    1.2 COEXISTENCE REQUIREMENTS
    1.3 CARRIER AGGREGATION FOR LTE-A IN THE UNLICENSED SPECTRUM:
    1.4 MAC LAYER COMPARISON OF THE WI-FI AND LAA
        1.4.1 802.11 DCF
        1.4.2 LAA LBT-CATEGORY 4
    1.5 CURRENT RESEARCH ON LTE-A/WI-FI COEXISTENCE
        1.5.1 CONTENTION WINDOWS
        1.5.2 CHANNEL OCCUPANCY TIME
        1.5.3 HIDDEN NODE PROBLEM
        1.5.4 POWER TRANSMISSION
        1.5.5 ENERGY DETECTION THRESHOLD
        1.5.6 SCENARIO-BASED COEXISTENCE
        1.5.7 COEXISTENCE IN OTHER SPECTRUM BAND AND TECHNOLOGIES
        1.5.8 QOS SUPPORT
    1.6 COEXISTENCE MODELING AND EVALUATION
    1.7 THESIS OUTLINE
    REFERENCES
CHAPTER-2: LBT ENHANCEMENT FOR LAA-WI-FI COEXISTENCE IN THEUNLICENSED SPECTRUM
    2.1 INTRODUCTION
    2.2 SYSTEM MODEL
        2.2.1 802.11 DCF
        2.2.2 LAA L BT CATEGORY 4
        2.2.3 LBT ENHANCEMENT PERIODIC LBT （P-LBT） MECHANISM
    2.3 PERFORMANCE RESULTS
        2.3.1 LAA-WI-FI LAA-LAA COEXISTENCE WITH LBT CATEGORY 4
        2.3.2 LAA-Wi-Fi LAA-LAA COEXISTENCE WITH LBT-OCCW
        2.3.3 LAA-Wi-Fi,LAA-LAA COEXISTENCE WITH P-LBT
    2.4 CONCLUSION
    REFERENCES
CHAPTER-3: SPATIAL-TIME DOMAIN MODEL FOR LTE-A DOWNLINK ONLYAND WI-FI COEXISTENCE IN THE UNLICENSED SPECTRUM
    3.1 INTRODUCTION
    3.2 MEDIUM ACCESS PROBABILITY
        3.2.1 LAA/WI-FI COEXISTENCE:TIME DOMAIN ANALYSIS
            3.2.1.1 WI-FI NETWORK
            3.2.1.2 LAA NETWORK
        3.2.2 LAA-WI-FI COEXISTENCE: SPATIAL DOMAIN ANALYSIS
    3.3 SINR COVERAGE
    3.4 Density of Successful transmission
    3.5 Numerical results
    3.6 Conclusion
    REFERENCES
CHAPTER-4: SPACE-TIME DOMAIN ANALYSIS LTE-A UPLINK/WI-FICOEXISTENCE: RANDOM OR SCHEDULED ACCESS
    4.1 INTRODUCTION
    4.2 SYSTEM MODEL
        4.2.1 CHANNEL ACCESS PROBABILITY
            4.2.1.1 TIME DOMAIN ANALYSIS
                4.2.1.1.1 ELAA NETWORK:
                    4.2.1.1.1.1 SCHEDULE ACCESS
                    4.2.1.1.1.2 RANDOM ACCESS
                    4.2.1.1.1.3 WI-FI NETWORK:
            4.2.1.2 SPACE-TIME ANALYSIS
                4.2.1.2.1
                    4.2.1.2.1.1 SA SELF-CARRIER SCHEDULING SCENARIO:
                    4.2.1.2.1.2 RA AND SA CROSS-CARRIER SCENARIO:
        4.2.2 SINR COVERAGE
            4.2.2.1 WI-FI/ELAA RANDOM ACCESS COEXISTENCE:
            4.2.2.2 WI-FI/ELAA SCHEDULED ACCESS COEXISTENCE:
                4.2.2.2.1 CROSS-CARRIER SCHEDULING:
                4.2.2.2.2 SELF-CARRIER SCHEDULING:
        4.2.3 AVERAGE RATE
        4.2.4 DENSITY OF SUCCESSFUL TRANSMISSION
    4.3 NUMERICAL RESULTS
    4.4 CONCLUSION
    REFERENCES
CHAPTER-5 CONCLUSION AND FUTURE DIRECTIONS
    5.1 CONCLUSION
    5.2 FUTURE DIRECTIONS
Published Papers


【參考文獻(xiàn)】：
期刊論文
[1]License Assisted Access-WiFi Coexistence with TXOP Backoff for LTE in Unlicensed Band[J]. Salman Saadat,Da Chen,Kai Luo,Mingjie Feng,Tao Jiang.  中國通信. 2017(03)



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