%% You should probably cite rfc9441 instead of this I-D.
@techreport{ietf-lpwan-schc-compound-ack-01,
    number =    {draft-ietf-lpwan-schc-compound-ack-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-ietf-lpwan-schc-compound-ack/01/},
    author =    {Juan-Carlos Zúñiga and Carles Gomez and Sergio Aguilar and Laurent Toutain and Sandra Cespedes and Diego S. Wistuba La Torre},
    title =     {{SCHC Compound ACK}},
    pagetotal = 9,
    year =      ,
    month =     ,
    day =       ,
    abstract =  {The present document describes an extension to the SCHC (Static Header Compression and Fragmentation) protocol {[}RFC8724{]}. It defines a SCHC Compound ACK message format, which is intended to reduce the number of downlink transmissions (i.e., SCHC ACKs) by accumulating bitmaps of several windows in a single SCHC message (i.e., the SCHC Compound ACK). The message format is generic, and can be used for instance by any the four LWPAN technologies defined in {[}RFC8376{]}, being Sigfox, LoRaWAN, NB-IoT and IEEE 802.15.4w.},
}