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Incorporating relay nodes in cellular networks, e.g., UMTS/HSPA, can prove to be beneficial as for extending coverage as for service enhancement. The latter is particularly important for uplink users at the cell edge which generally suffer from relatively poor service due to signal degradation. In this paper, the authors concentrate on one especially interesting aspect of relaying, namely its impact on inter-cell interference. In particular, a number of uplink packet scheduling schemes are discussed, each scheme deploying the relay functionality in different ways. By performing a combined packet and flow level analysis they are able to capture both scheduler specifics and random behavior of the users (initiation and completion of flow transfers).
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