Uplink Energy-Delay Trade-Off under Optimized Relay Placement in Cellular Networks

作者：Minelli Mattia^*; Maode Ma; Coupechoux Marceau; Kelif Jean Marc; Sigelle Marc; Godlewski Philippe

来源：IEEE Transactions on Mobile Computing, 2016, 15(9): 2376-2387.

DOI：10.1109/TMC.2015.2496960

• Cellular networks
• relay
• relay placement
• energy consumption
• delay
• simulated annealing

Relay nodes-enhanced architectures are deemed a viable solution to enhance coverage and capacity of nowadays cellular networks. Besides a number of desirable features, these architectures reduce the average distance between users and network nodes, thus allowing for battery savings for users transmitting on the uplink. In this paper, we investigate the extent of these savings, by optimizing relay nodes deployment in terms of uplink energy consumption per transmitted bit, while taking into account a minimum uplink average user delay that has to be guaranteed. A novel performance evaluation framework for uplink relay networks is first proposed to study this energy-delay trade-off. A simulated annealing is then run to find an optimized relay placement solution under a delay constraint; exterior penalty functions are used in order to deal with a difficult energy landscape, in particular when the constraint is tight. Finally, results show that relay nodes deployment consistently improve users uplink energy efficiency, under a wide range of traffic conditions and that relays are particularly efficient in non-uniform traffic scenarios.

• 出版日期2016-9-1
• 单位TELECOM ParisTech; 南阳理工学院