In the scope of the REWIND European Research Program we propose a Multi-Hop Relay network architecture, based on the recently developed IEEE 802.16j standard with the aim of enhancing throughput, network coverage and capacity density. In particular, we provide an essential description of the Relay Station Software architecture design, mainly focused on the PHY and MAC layers architecture, by analyzing the essentials of the downlink and uplink data flows, on the basis of the corresponding relay node to be included in the wireless network.