In various aspects, power saving host-modem interactions are described herein. For instance, a host of a communication device includes a host processor that receives, via an interface, information about the reduced activity state of a modem of the communication device including an indication of the RRC state of the modem. It also receives, via the interface, information about a projected expiration of a reduced activity period of the modem including an indication of a time remaining until a next event of the modem. The host processor controls a reduction of an operation of a component of the communication device during the reduced activity period of the modem, based on the indication of the RRC state of the modem and the indication of the time remaining until the next event of the modem. The reduced activity state of the modem corresponding to the reduced activity period of the modem.