METHOD AND DEVICE AT A TRANSMITTER AND RECEIVER UNIT IN A MOBILE TELEPHONE SYSTEM

摘要

A method and apparatus for providing communication signals via air or other ducting in a building. Two-way mobile telephone communications between a mobile telephone in a building and an antenna in one or more air ducts may be provided. In one embodiment, wireless communication between at least two antennas in a ventilation duct and rooms and spaces in a building may be provided without the use of bi-directional couplers or re-radiators. In another embodiment, a first signal may be emitted from an antenna in a ventilation duct of a building and the first signal transmitted by the duct for passage through an opening into a room or space in the building. A second signal may be received into the duct through the opening and transmitted by the duct from the opening for reception by the antenna.