A user-centric no-cell (UCNC) framework has been proposed which enables different level coordination over a large number of TRPs. This paper presents some key technologies in UCNC framework with the focus on PoC of UL grant- free transmissions in UCNC architecture. Massive connectivity support is one of the three important scenarios in 5G networks. The challenges to support massive connectivity lie in the cost of signaling overhead and transmission latency. An uplink grant- free transmission based on SCMA (sparse code multiple access) design is proposed. The proposed scheme can provide different levels of overloading to efficiently meet the massive connectiv- ity requirements. Extensive lab tests have been conducted to verify the performance matrices. Taken LTE as a baseline for comparison purpose, it is shown that the signaling overhead by using uplink grant-free transmission can be reduced by around 80% and the user plane transmission latency in ECO state can be reduced by around 93%. Moreover, massive connectivity is efficiently supported with SCMA scheme that yields around 230% gain over OFDMA in terms of supported active users.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    5G PoC of SCMA-Based Uplink Grant-Free Transmission in UCNC Framework


    Contributors:
    Zhang, Jinfang (author) / Lu, Lei (author) / Sun, Yuntao (author) / Chen, Yan (author) / Liang, Jiamei (author) / Liu, Jin (author) / Yang, Huilian (author) / Xing, Shuangshuang (author) / Wu, Yiqun (author) / Ma, Jianglei (author)


    Publication date :

    2017-06-01


    Size :

    452259 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



    Active User Detection of Uplink Grant-Free SCMA in Frequency Selective Channel

    Wang, Feilong / Zhang, Yuyan / Zhao, Hui et al. | IEEE | 2018


    PHY Abstraction and System Evaluation for SCMA with UL Grant-Free Transmission

    Cheng, Meng / Wu, Yiqun / Li, You et al. | IEEE | 2017


    SCMA Uplink Decoding with Codebook Collision

    Yang, Yanjun / Zhao, Yuping / Li, Dou | IEEE | 2017


    Uplink SCMA with STBC in Fading Channels

    Li, Huan-Ying / Liu, Zi-Jing / Yu, Qi-Yue et al. | IEEE | 2020


    SCMA-Based Uplink and Downlink Resource Reuse for Clustered mMTC

    Zhong, Fangsheng / Zhao, Ming / Zhou, Wuyang | IEEE | 2017