Cooperative Multicasting in Renewable Energy Enhanced Relay Networks-Expending More Power to Save Energy

Power and on-off control problems are examined for renewable energy enabled base-stations (BSs) and relay nodes (RNs) in cooperative multicast networks. Renewable energy is utilized at BSs and RNs to reduce the overall grid energy cost. By considering a practical energy consumption model and the sta...

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Bibliographic Details
Published in:IEEE transactions on wireless communications 2016-01, Vol.15 (1), p.753-768
Main Authors: Shi-Yong Lee, Chia-Yu Liu, Min-Kuan Chang, De-Nian Yang, Hong, Y.-W Peter
Format: Article
Language:English
Subjects:
Approximation methods
Arrivals
cooperative relaying
Energy conservation
Energy consumption
Energy costs
Energy harvesting
green communications
Mathematical analysis
multicast
Multicast communication
Power control
Power demand
Relay
Relays
Renewable energy
Renewable energy sources
Renewable resources
Wireless communication
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Summary:Power and on-off control problems are examined for renewable energy enabled base-stations (BSs) and relay nodes (RNs) in cooperative multicast networks. Renewable energy is utilized at BSs and RNs to reduce the overall grid energy cost. By considering a practical energy consumption model and the statistics of the renewable energy arrival, the optimal transmit powers are first determined by minimizing the expected grid energy consumption subject to an average outage probability constraint at MUs. The optimal solution is found via line search in the general case and is obtained in closed-form at high SNR. In addition, an on-off control policy is also proposed to further reduce the basic operational energy costs. The joint on-off and power control problems are solved approximately using two sequential deflation techniques, namely, the subset-search and the convex-relaxation-based approaches. The power control problem is also extended to the multicarrier scenario with unequal transmit powers and is solved using successive convex approximation. Simulations using the photovoltaic energy arrival model are provided to demonstrate the effectiveness of the proposed schemes. The results show that expending more power at RNs allows for more efficient use of renewable energy and, thus, increases energy-savings.
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2015.2477903