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4G cellular systems and the IMT Advanced candidates will provide broadband wireless access with QoS. Especially in multihop configurations of these systems the base station controls resources centrally while relays can take over a part of the responsibility on the second hop. To make this work on layer two, scheduling is the most important task. However, many dimensions of the problem lead to much confusion. In this paper the authors approach this complexity inside the MAC layer. They propose that packet and resource scheduling are two distinct tasks inside the medium access control layer of a wireless system. Due to the frequency selective channel and huge path loss ranges dynamic subcarrier assignment and adaptive power control are important.
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