Channel assignment and MAC protocol for indoor wireless infrared ad hoc network

Abstract

This chapter discusses our proposed channel assignment and reassignment method and MAC protocol algorithm for wireless infrared ad-hoc networking based on our transceiver design which utilises directional emitters and is fully controlled by microcontroller M16/C. In channel assignment two control handshake signal codes are used; the SCAN and INFORM signals which are conveyed on two different carrier frequencies/channels. The channel assignment and reassignment method together with the directional emitters enable to resolve the problem of cochannel interference. Five control handshake signals; two directional Request to Send (RTS), two directional Clear to Send (CTS) and a directional Acknowledgement (ACK), are used at Medium Access Control (MAC) protocol for resolving potential collisions among the transceivers. Two known popular problems in Ad-Hoc network; the exposed terminal and hidden terminal problems are efficiently managed by our MAC protocol