Communication devices and methods of data communication are herein disclosed. In some aspects, a communication device may include a host and a modem interconnected by an interface. The host includes a host processor configured to control components of the communication device and to communicate with the modem via the interface. The modem includes a modem processor configured to control components of the modem and to communicate with the host via the interface. The modem processor is further configured to communicate information on a reduced activity state and a time remaining until a next event of the modem to the host processor. The host processor is further configured to reduce an operation of at least one component of the communication device based on receipt of the information on the reduced activity state of the modem and the time remaining until the next event of the modem.