FYI, the DOCSIS 3.1 specifications were released yesterday.   New in D3.1 is mandatory support for AQM (with default = on).

Cable modems are required to implement a variant of PIE (detailed in Annex M of MAC and Upper Layer Protocols Interface Specification) as the default AQM.  Modem vendors are free to implement additional algorithms if they so choose.  CMTSs are required to implement an AQM meeting certain high-level criteria, but the choice of algorithm is left to the implementer.

-Greg