Distributed energy-aware resource allocation in multi-antenna multi-carrier interference networks with statistical CSI

Abstract

Resource allocation for energy efficiency optimization in multi-carrier interference networks with multiple receive antennas is tackled. First, a one-hop network is considered, and then, the results are extended to the case of a two-hop network in which amplify-and-forward relaying is employed to enable communication. A distributed algorithm which optimizes a system-wide energy-efficient performance function, and which is guaranteed to converge to a stable equilibrium point, is provided. Unlike most previous works, in the definition of the energy efficiency, not only the users' transmit power but also the circuit power that is required to operate the devices is taken into account. All of the proposed procedures are guaranteed to converge and only require statistical channel state information, thus lending themselves to a distributed implementation. The asymptotic regime of a saturated network in which both the active users and the number of receive antennas deployed in each receiver grow large is also analyzed. Numerical results are provided to confirm the merits of the proposed algorithms.

Research challenges on energy-efficient networking design

“…While network-level approaches are fundamental to save energy through resource-on-demand approaches, additional saving can be achieved with physical layer solutions. In the TREND framework, several solutions have been proposed for different technologies and various aspects of transmission, from power control [36], to retransmission protocols for reliability [37], to resource allocation strategies, topic that, with the increase of traffic and bandwidth demand, still remains the key issue in wireless access [38][39][40]. The results of the research developed in this context show that a careful redesign of all the aspects of transmission is effective and should integrate network-level approaches.…”

“…Energy-aware PON dimensioning can be very helpful for network operators, allowing them to optimize the investment from the service perspective. As the access speed is increasing, and also considering the challenges of fixed-wireless convergence, migration to next-generation PONs in a cost-effective and energy efficient way can guarantee the massive adoption of ultra-high speed broadband access in countries as well as long-term energy sustainability of ICT [36][37][38].…”

Energy-efficient uplink power control for multiuser SIMO systems with imperfect channel state information

“…So far, only a few research has considered imperfect CSI in EE design for MIMO. In [20], energy-efficient subcarrier and power allocation in the uplink of a multi-carrier interference network are addressed, where only statistical CSI is available at the transmitters. In [21], bandwidth, transmit power, active transmit/receive antenna number, and active user number are adjusted to improve the system-wise energy efficiency in the downlink multiuser MIMO systems assuming imperfect CSI at the BS.…”