5G非授权频段组网技术
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摘要
随着移动通信业务需求的不断增长,授权频段的短缺日益明显,5G网络亦开始考虑在非授权频段的部署,即使用NR协议在非授权频段提供接入服务。5G非授权频段组网的主要挑战是在5G新技术特性下支持LBT机制,保障同已有非授权全频段系统(WLAN、LTELAA等)的公平性,合理共享频谱。从LBT机制的演进入手,分析了LBT对5G非授权频段组网的影响,归纳了相关的标准化进展及挑战,并针对突出的关键技术问题提出可行的创新解决方案,保障5G非授权频段组网性能,最小化LBT失败带来的影响。
Due to the growing demand for mobile communication services, the shortage of licensed frequency bands is becoming more and more obvious. Therefore 5 G networks begin to consider deployment in the unlicensed spectrum, that is, to employ the NR protocol in unlicensed spectrum to provide access services. The main challenge of 5 G networking in the unlicensed spectrum is to support LBT mechanism considering 5 G new technical features and thus to guarantee fairness with existing systems as well as efficient spectrum sharing, the impact of LBT on 5 G networking in the unlicensed spectrum was analyzed, the relevant standardization progress and challenges was summarized.Feasible and innovative solutions were proposed for some key technical issues to minimize the impact of LBT failure and thus to ensure the performance of 5 G networking in the unlicensed spectrum.
Due to the growing demand for mobile communication services, the shortage of licensed frequency bands is becoming more and more obvious. Therefore 5 G networks begin to consider deployment in the unlicensed spectrum, that is, to employ the NR protocol in unlicensed spectrum to provide access services. The main challenge of 5 G networking in the unlicensed spectrum is to support LBT mechanism considering 5 G new technical features and thus to guarantee fairness with existing systems as well as efficient spectrum sharing, the impact of LBT on 5 G networking in the unlicensed spectrum was analyzed, the relevant standardization progress and challenges was summarized.Feasible and innovative solutions were proposed for some key technical issues to minimize the impact of LBT failure and thus to ensure the performance of 5 G networking in the unlicensed spectrum.
引文
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[2]ZHENNIAN S,XU X,XIAO M C,et al.The new architecture with time-spatial consistency for 5G networks[J].China Communications,2016,13(1):68-79.
[3]PICHNA R,OJANPERA T,POSTI H,et al.Wireless internet:IMT-2000/wireless LAN interworking[J].Journal of Communication and Networks,2000,2(1):46-57.
[4]SALKINTZIS A K,FOR C,PAZHYAN R.WLAN-GPRS integration for next-generation mobile data networks[J].IEEEWireless Communications,2002,9(5):112-124.
[5]ALMEIDA E,CAUALCAN A M,PAIVA R C D,et al.Enabling LTE/WiFi coexistence by LTE blank subframe allocation[C]//2013 IEEE International Conference on Communications(ICC),June 9-13,2013,New York,USA.Piscataway:IEEE Press,2013:5083-5088.
[6]AL-DULAIMI A,AL-RUBAYE S,NI Q,et al.5G communications race:pursuit of more capacity triggers LTE in unlicensed band[J].IEEE Vehicular Technology Magazine,2015,10(1):43-51.
[7]ZHANG H,CHU X,GUO W,et al.Coexistence of Wi-Fi and heterogeneous small cell networks sharing unlicensed spectrum[J].IEEE Communications Magazine,2015,53(3):158-164.
[8]LIEN S Y,CHENG S M,CHEN K C,et al.Resource-optimal licensed-assisted access in heterogeneous cloud radio access networks with heterogeneous carrier communications[J].IEEETransactions on Vehicular Technology,2016,65(12):9915-9930.
[9]VOICU A M,SIMIC L,PETROVA M.Inter-technology coexistence in a spectrum commons:a case study of Wi-Fi and LTEin the 5-GHz unlicensed band[J].IEEE Journal on Selected Areas in Communications,2016,34(11):3062-3077.
[10]WU D,NEIGI R.Effective capacity:a wireless link model for support of quality of service[J].IEEE Transactions on Wireless Communications,2003,2(4):630-643.
[11]MUSAVIAN L,NI Q.Effective capacity maximization with statistical delay and effective energy efficiency requirements[J].IEEE Transactions on Wireless Communications,2015,14(7):3824-3835.
[12]JIN F,ZHANG R,HANZO L.Resource allocation under delay-guarantee constraints for heterogeneous visible-light and RFfemtocell[J].IEEE Transactions on Wireless Communications,2014,14(2):1020-1034.
[13]KAFEZAKIS E,KONTOVASILIS K,STAVRAKAKIS I.Anovel effective capacity-based framework for providing statistical QoS guarantees in IEEE 802.11 WLANs[J].Computer Communications,2012,35(2):249-262.
[14]3GPP.Study on licensed-assisted access to unlicensed spectrum(Release 13):TR36.889 V13.0.0[S].2015.
[15]Qualcomm Technologies,Inc.Progress on LAA and its relationship to LTE-U and MulteFire[EB].2016.
[16]3GPP.New WID on NR-based access to unlicensed spectrum:RP-182878[S].2018.
[17]3GPP.Study on NR-based access to unlicensed spectrum(Release 16):TR38.889 V16.0.0[S].2018.