Propagation environment notification methods and notification systems in radio communication systems, and record media recording control programs thereof

DETAILED DESCRIPTION Object of the Invention When a general user establishes a radio communication system in the user's area, however, the user does not necessarily have expert knowledge associated with radio wave propagation, thus making it difficult to predict shadow areas to perform stable radio communication.
Also, even though stable radio communication can be achieved, the radio propagation environment is changed if the area layout is changed, and thus communication cannot necessarily performed after changing the layout.
Thus, in order that the user establishes a radio system, it is important that the user himself can easily define the placement of appliances and the position of the base station in the area, and understands the user's area radio propagation environment.
If the radio propagation environment can be understood, the user himself can make a fine adjustment of the position of the base station so that the user can perform communication in the position desired by the user.
In the prior arts, however, since the mechanism of defining a building structure by the user himself is not precise, and only base station information is given to the user, unpredicted radio shadow areas may be created if the user makes a fine adjustment flexibly.
Furthermore, in the case where different radio systems coexist, a situation in which communication cannot be performed although radio waves arrive may occur unless not only radio shadow areas but also mutual interference among systems is taken into account.
For example, radio systems given in specifications of wireless LAN (local area network), ISO/IEC8802-11, Information technology-Telecommunications and information exchange between systems-Local and metropolitan area networks-Specific requirements-Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications and in radio systems given in BLUETOOTH SPECIFICATION Version 1.
0B, it is assumed that the same frequency domain is used as a send/receive frequency, thus causing mutual interference