%% You should probably cite rfc8772 instead of this I-D.
@techreport{chz-simple-cu-separation-bng-protocol-01,
    number =    {draft-chz-simple-cu-separation-bng-protocol-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-chz-simple-cu-separation-bng-protocol/01/},
    author =    {Shujun Hu and Donald E. Eastlake 3rd and Mach Chen and Fengwei Qin and Zhenqiang Li and Tee Mong Chua},
    title =     {{The China Mobile, Huawei, and ZTE BNG Simple Control and User Plane Separation Protocol (S-CUSP)}},
    pagetotal = 126,
    year =      2019,
    month =     jun,
    day =       14,
    abstract =  {To support Control Plane (CP) and User Plane (UP) Separation (CUPS) for fixed network Broadband Network Gateway (BNG) service providers, China Mobile, Huawei Technologies, and ZTE have developed a simple CUPS control channel Protocol (S-CUSP). This document is not an IETF standard and does not have IETF consensus. It is presented here to make the S-CUSP specification conveniently available to the Internet community to enable diagnosis and interoperability.},
}