The need for reliable communications does not stop at the door of a building. Increasingly public safety entities, commercial wireless providers and wireless users require reliable communications inside buildings and where applicable, inside tunnels. For public safety, reliable coverage is often essential throughout a broad jurisdiction, including coverage on-stree, in-building, and in-tunnels. In such cases, there is no substitute for a properly designed dedicated mission critical communications systems with sufficient transmit sites to provide the level of signal required for reliable coverage anywhere within the jurisdiction, whether on the street or indoors. This paper covers the basics of in-building systems, techniques to minimize the risk of interference, and engineering best practices to provide robust in-building coverage.
