distributed channel probing and sequential access for ultra dense networks: joint spectrum- and energy-aware design

Ultra dense network (UDN) with universal resource reuse capability is recognized as a promising technology for 5G. In this paper, we advance a distributed channel probing and sequential access (DISCO-SEA) scheme for UDNs, which enables an autonomous procedure for network expanding by blending receiver-transmitter pairing, interference avoidance, spectrum sharing, power control, and admission control. The autonomous network expansion is carried out through spectrum-aware channel probing and energy-aware receiver-transmitter pairing, which are performed under a distributed recursive power computation framework based on power updating factors. In particular, the channel probing is designed to check expandability, whereby a closed-loop cognitive mechanism is resorted to exactly predict the surplus capacity an active network reserved for the unserved users. The active network accommodate the new link in favor of energy efficiency so that the expanded network can leave as much capacity margin for the next expansion as possible. Accordingly, an active network can be scaled up by continuously adding new links in a sequential manner. DISCO-SEA promises a joint spectrum- and energy-efficient UDN towards optimizing the system performance and guaranteeing individual minimum performance. Also, the recursive power computation is developed with a computation-aware signaling strategy, allowing for computation-information reuse and significant reduction in signaling overhead, computation time, and memory amount.