CASSIOPEE: A hybrid wireless LAN consisting of an infrared cellular network and a token bus backbone LAN

The work presented concerns the study and the implementation of an in-house wireless local area network which allows fixed standard devices (Wired End System) and mobile devices (Moving End System) to interconnect. The topology presented consists of an industrial token bus backbone LAN and infrared wireless star subnets. The different access points are distributed around a "U" model. Details are given about a specific addressing method of the moving stations. The access method to the infrared medium, the tracking of the moving stations and the routing handling are partially distributed; a Hybrid Network Controller provides the complementary undistributed resources