The TETRA Air Interface protocol is used for communication between the base station and the mobile terminals. It's responsible for things like call setup, voice transmission, and data transfer. . A base station represents an access point for a wireless device to communicate within its coverage area. It usually connects the device to other networks or devices through a dedicated high bandwidth wire of fiber optic connection. Base stations typically have a transceiver, capable of sending and. . This applicationrelates to the field of communication technology, and in particular to a communication method between a terminal and a base station and a communication device between a terminal and a base station. D2D communication technology(Device-to-Device Communication, device-to-device) refers. . A base transceiver station (BTS) or a baseband unit[1] (BBU) is a piece of equipment that facilitates wireless communication between user equipment (UE) and a network. UEs are devices like mobile phones (handsets), WLL phones, computers with wireless Internet connectivity, or antennas mounted on. . A TETRA base station is a key part of the TETRA network. Equipped with an electromagnetic wave antenna, often placed on a tall mast, the base station enables communication between mobile terminals (such as mobile phones or pagers). . terminal nodes and one relay, all of which are half-duplex, in which, contrary to prior work, each node has a direct link with every other node. Each of the m terminal nodes exchanges messages with the base-station in a bi-directional fashion, leading to 2m total messages to be communicated with. .