1. A first communication device for wireless communication in a wireless communication system, wherein said wireless communication system comprises a base station and a plurality of wireless communication devices arranged in clusters, wherein a different cluster signature is assigned to each cluster and one or more wireless communication devices in the cluster, wherein the first wireless communication device is allocated to a first cluster, the first wireless communication device comprising:a receiver, configured to receive a first cluster signature assigned to said first cluster from the base station, wherein the wireless communication devices are arranged in clusters based on pre-defined criteria, wherein the pre-defined criteria comprises a sparsity corresponding to a number of active wireless communication devices,
a memory, configured to store said first cluster signature received from the base station, and
a transmitter, configured to transmit said first cluster signature in response to the wireless communication device switching into an active state,
wherein the first wireless communication device is adapted to access resources based on resource allocation information received in response to the transmitter transmitting said first cluster signature.