Radio transmission system with point-multipoint type topology enclosing stations suitable to operate according to multiple operation modes and according to multiple standards

摘要

In transmission systems of the point-multipoint type (PMP) a master station and one or more terminal stations are defined; a downstream channel from the master station towards the terminal stations and an upstream channel from the terminal stations to the master station are also defined.;The system can be optimised in different ways for different applications. An example can be the fixed packet or variable packet optimisation; another example can be the optimisation for the operational flexibility or for the efficiency.;These optimisations give origin to different systems and different standards, incompatible among them, with different frame structures.;The present invention solves the problem of implementing a multi-standard terminal, that is, terminal capable to automatically adjust to any frame structure in a limited set of different structures, optimised in a different way.;The master station, which results of course being specialized to operate in accordance with a specific operation method, imposes said operation method and the terminal stations slaved to the same, conform to them, recognizing the operation mode from the frame preamble.;The frame preamble, periodically transmitted from the master station to the terminal stations, according to the present invention is differentiated in different sequences, each one identifying a different operation mode.