Abstract:
A process carried out by a first mobile radio includes detecting a request to transmit group communication media and, responsively, determining, by the first mobile radio, whether a push-to-talk (PTT) key input is in an activated or de-activated state, selecting, by the first mobile radio and as a function of the determined state of the PTT key, one of a first talkgroup on a first wireless network and a second talkgroup on a second wireless network as a target talkgroup to transmit the communication media to, and transmitting, by the first mobile radio via a corresponding one of a first wireless communication interface to the first wireless network and a second wireless communication interface to the second wireless network, the communication media to the selected target talkgroup.
Abstract:
A process carried out by a first mobile radio for joining a sub-talkgroup of a first talkgroup includes receiving, via a provisioning process or via an infrastructure wireless communication interface from an infrastructure radio access network (RAN) while within wireless communication range of the RAN, a talkgroup-specific security token associated with and shared by all group mobile radios in a first talkgroup to which the first mobile radio is subscribed via the RAN. The first mobile radio then detects, via a short-range wireless communication interface, a second mobile radio, and authenticates, the second mobile radio using the talkgroup-specific security token. If the authentication is successful, the first mobile radio adds an identity of the second mobile radio to a sub-talkgroup set of mobile radios of the first talkgroup.