Throughput-optimal distributed probabilistic medium-access in MPR-capable networks

Authors:
Majid Ghanbarinejad;Christian Schlegel
Affiliations:
Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Canada;Department of Computing Science, University of Alberta, Edmonton, Canada
Venue:
MACOM'11 Proceedings of the 4th international conference on Multiple access communications
Year:
2011

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Abstract

Enabling multipacket reception (MPR) at the physical layer is a promising way to achieve higher bandwidth efficiency while reducing the complexity of the medium-access control layer in distributed networks. We study distributed probabilistic access where transmitting nodes access the shared wireless medium with a probability optimized based on the node's information about the aggregate traffic offered by the network. We model bursty traffic by rate-controlled two-state Markov sources and introduce a parameter that describes the "burstiness" level of the offered traffic. The throughput-optimal medium-access strategy utilizing limited feedback is then described and its performance is examined for traffic with different levels of burstiness. It is shown that the bursty nature of the traffic in data networks allows for further improvement of the bandwidth efficiency. Bounds for the system throughput are proposed and queuing delay is analyzed.