Eradication of funneling effect in wireless communication using TDMA based MAC

With the rapid development of wireless communication technologies, the idea to use wireless technology in industrial plant floor is striking and the benefits are manifold [1]. The many to-one and hop-by-hop network makes the aperture a barrier and causes a kind of clogging called funnelling effect near the aperture and thus influence real-time and consistency. In this paper, we first present an industrial wireless communication protocol for factory automation systems based on IEEE802.15.4. We present a transmitting rate control technique that takes the fairness issue into consideration for many-to-one routing to reduce the conduit effect. Funnelling-MAC is based on network-wide CSMA and localized, sink-oriented TDMA to mitigate funnelling effect [8]. We introduce a priority based service differentiation and adaptive TDMA time slot scheduling mechanism to solve the clogging in the aperture [9]. The analysis shows this technique eradicates the funnelling effect, improve the communication performance and satisfy the requirements of the industrial Applications.