5 GHz非授权频段LTE/LTE-A与Wi-Fi共存问题研究

发布时间：2021-03-31 15:47

　　如今,有限的授权频段和日益增长的网络服务,包括视频数据流、网络游戏和网络话务容量之间的矛盾已经成为通信网络最急需解决的挑战。通过额外的授权频段来增加网络容量是一个切实可行的解决办法。通过空中接口调度,LET-A频谱效率已经达到了最高水平,并且在密集网络中表现出色。为了满足新的网络服务需求,将LTE-A这样的先进技术扩展到非授权频段中,是一个可能的解决方案。然而,为了使LTE-A能够与Wi-Fi等非授权频段中其他频谱接入技术共存,移动运营商会对LTE-A进行少量修改。运营商通过改变调度信道技术或者升级核心网络来修改空中接口。第二种解决方案则很少被考虑,研究机构和标准化组织更着重于空中接口的设计,而不是核心网络的修改,来降低LTE-A部署在非授权频段中的复杂性。不同的国家对非授权频段的管理实体有不同的限制,这些限制包括传输功率,信道接入方法,雷达保护过程,频段聚合,信道占用时间。虽然这些限制因国家而异,但果LTE-A需要在非授权频谱运行,则必须考虑到这些限制。非授权频谱是不同技术的共享频段;因此,在非授权频段内运行,需要一种新的机制,它要求其他技术和其他运营商在同一频段内平等共存。·网络致... 

【文章来源】：北京邮电大学北京市 211工程院校 教育部直属院校

【文章页数】：128 页

【学位级别】：博士

【文章目录】：
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


【参考文献】：
期刊论文
[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.  中国通信. 2017(03)



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