Guest Editorial Green Communications and Networking Series

Ender Ayanoglu
2016 IEEE Journal on Selected Areas in Communications  
A SUBSTANTIAL amount of research exists in the area of energy efficiency in communications and networking. In recognition of this fact, the IEEE Communications Society has decided to publish a SERIES ON GREEN COMMUNICA-TIONS AND NETWORKING (SGCN) as three issues of the IEEE JOURNAL ON SELECTED AREAS IN COMMUNICA-TIONS (JSAC). The first issue of JSAC SGCN was published in December 2015 with 39 papers. The second issue was published in May 2016 with 52 papers. This third and last issue has a
more » ... of 71 papers, covering a wide selection of topics. These topics can be characterized in six categories, with one subcategory appearing in one of the six main categories. The first category in this issue is energy efficiency in wireless communications and networking. There are 15 papers in this category. The first paper by Cheng et al. concentrates on Fifth Generation (5G) cellular networks and proposes an optimization approach based on statistical Quality-of-Service (QoS). Zarakovitis et al. consider the nonideal case of imperfect Channel State Information (CSI) and data outage and present an energy-efficient system proposal. Che et al. jointly design the optimal Base Station (BS) on/off operation policy and the on-grid energy purchase policy from a networklevel perspective in a large-scale network. Souza et al. consider the uplink connection in Orthogonal Frequency Division Multiple Access (OFDMA) networks and describe power and subcarrier allocation strategies for energy efficiency. Zhao and Wang study a Cloud Radio Access Network (C-RAN) and attempt to achieve a power consumption tradeoff between the transport network and the Remote Radio Heads (RRHs). They formulate an RRH selection problem, which takes the traffic density of the service area into consideration and falls into a generalized form of classical capacitated facility location problem. The optimization task is to select a subset of the RRHs to minimize the total power consumption of the C-RAN while satisfying a series of network constraints, including power and bandwidth budgets, traffic demand, and spectral efficiency requirement. To that end, they develop an efficient local search algorithm. Yan et al. compare energy consumption of conventional mobile services against those of newer and popular services such as instant messaging. Kim and Wentzloff study ultra low-power (ULP) devices and propose the concept of embedded back-channel communication through Orthogonal Frequency Division Multiplexing (OFDM) frames. Even if the ULP devices are incapable of demodulating OFDM, they can decode the embedded messages. Liu considers secondary users in cooperative cognitive radio networks and develops an energy-efficient strategy for them. Yang et al. study the recently popular concept of Device-to-Device (D2D) communications and develop an energy-efficient power control strategy for them. The authors investigate the energy-efficient power control for D2D communications underlaying cellular networks, where uplink resource blocks allocated to one cellular user equipment are reused by multiple D2D pairs and co-channel interference caused by resource sharing becomes a significant challenge. Due to the unaffordable complexity of the global optimal solution, the authors propose suboptimal schemes through adding constraints on the interferences to convert the non-concave problems into concave ones and to give sub-optimal solutions with reasonable complexity. Simulation results are presented to demonstrate the effectiveness of the proposed schemes. Ortin et al. study IEEE 802.11 wireless local area networks and develop resource-on-demand schemes for them for energy efficiency. Five papers in this category concentrate on small cells or heterogeneous networks. The first paper in this subcategory is by Sun et al. It concentrates on time division duplex and studies energy efficiency through traffic adaptation in small cell networks. Wu et al. concentrate on unlicensed spectra and propose a secrecy-based approach for data offloading for energy efficiency. Liu and Fong investigate coverage probability, link and network energy efficiencies in the downlink of a heterogeneous cellular network consisting of K independent Poisson point processes of BSs. They propose a simple and feasible energy-efficient channelaware cell association scheme, together with the maximum received power association and nearest base station association schemes. Gabry et al. consider edge-caching in heterogeneous networks from an energy efficiency point of view. Finally, Kashef et al. introduce dynamic planning which has been used by network operators for energy saving by switching BSs onoff according to the traffic load conditions while providing QoS guarantees for mobile users. The second category is optimization and resource allocation for energy efficiency. There are 13 papers in this category. The first paper in this category is by Guan et al. It introduces sleep scheduling for communication networks based on cooperation between the network and the users. In order to accomplish this, the authors exploit the selfishness of both users and the network to cooperatively schedule the idle links and nodes into sleep to save energy. The paper by Luo et al. considers green cognitive communications and develops an integrated spectrum and information market for it. Li et al. consider a joint optimization problem with the simultaneous satisfaction of four objectives: BS operation,
doi:10.1109/jsac.2016.2626106 fatcat:m3n77eyrtjfrxalhz4i2dw76si