Wireless networking is not yet able to meet the strict requirements of the industrial world. Despite offering a bunch of advantages, it struggles because of the harsh requirements to latency and reliability posed by some of the applications. In this thesis, a method is presented that enables the differentiation between traffic classes on the MAC layer. This allows the reallocating of resources to prioritize the traffic with higher requirements. Therefore, each node in the network is buffering overheard traffic and dynamically takes over the role as relay. By letting each node decide on its own whether it should act as a relay or not and using TDMA to control the medium access, the need for short-noticed communication between the different entities in the network can be eliminated. An experimental evaluation indicates that the presented protocol design achieves a clear prioritization, without reducing the QoS provided to the lower priority traffic. Reliabilities of up to