Fuente: WIPO "sustainability" Methods, apparatus and circuitry for modifying and requesting modifications to a sustainability profiles for a communication device. The sustainability profile includes radio resource control parameters to be implemented by the communications device for communication with an infrastructure equipment of a wireless communication network. A communications device may request a modification to an existing sustainability profile, which may be accepted or rejected by the network. The network may also determine that the sustainability profile should be modified without the communications device requesting such a modification.