Development of TETRA Radio Backhaul Network Redundancy Plan for Disaster Recovery in Mission Critical Communications

This paper presents a development of TETRA Radio Backhaul Network redundancy plan for fast disaster recovery in mission critical communications. A redundancy plan (1+1) based on microwave backhaul links applied to a realistic network mimicking the Portuguese emergency communication system, in which the base stations (BSs) were selected according to favourable high ground elevation points with clear LOS between different BSs. The feasibility of establishing microwave radio links between different BSs was analysed, not only in terms of maximum range limited by the overall system dynamic range, but also in terms of Fresnel Zones clearance. A shortest-path algorithm was then used to evaluate all valid microwave radio links and generate an optimised redundancy plan in a tree topology. Finally, the shortest-path algorithm was used with specific constraints, to generate a redundancy plan (1+1).