A QoS-aware Adaptive Access Point Sleeping in Relay Cellular Networks for Energy Efficiency

The access point sleeping scheme is an efficiency method for power saving in the cellular networks. This paper proposes a QoS-aware adaptive access point sleeping scheme designed for energy efficiency in the relay cellular networks. To achieve the best tradeoff between QoS guarantee of users and the power saving of the network, the optimization problem of the access point selection for each user is given, and a dynamic energy control (DEC) algorithm is presented, in which, a best access point (base station or relay station) is allocated to each user and the access point without user association will be switched off for energy saving. We evaluated the network performance of power consumption, system throughput and energy efficiency by simulation, which show that, compared other schemes, the proposed access point sleeping scheme with DEC algorithm can improve the energy efficiency with the QoS guarantee for relay cellular networks, especially in low traffic condition.