TETRA Backhauling via Satellite: Improving Call Setup Times and Saving Bandwidth

Table 1

TETRA protocol timer ranges [6].

Timer	Timer	Start	Terminate
number	value	on	on
T301	1 s to 30 s	ISI-IC-COMPLETE_req_ind transmission	ISI-IC-COMPLETE_resp_conf reception
T302	1 s to 60 s	ISI-IC-SETUP_req_ind transmission	ISI-IC-COMPLETE_req_ind reception
T303	1 s to 60 s	Setup request to SwMI	Call proceeding response from SwMI