Energy-Efficient Resource Assignment and Power Allocation in Heterogeneous Cloud Radio Access Networks
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Open Access
- 12 December 2014
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Vehicular Technology
- Vol. 64 (11), 5275-5287
- https://doi.org/10.1109/tvt.2014.2379922
Abstract
Taking full advantage of both heterogeneous networks and cloud access radio access networks, heterogeneous cloud radio access networks (H-CRANs) are presented to enhance both spectral and energy efficiencies, where remote radio heads (RRHs) are mainly used to provide high data rates for users with high quality of service (QoS) requirements, whereas the high-power node (HPN) is deployed to guarantee seamless coverage and serve users with low-QoS requirements. To mitigate the intertier interference and improve energy efficiency (EE) performances in H-CRANs, characterizing user association with RRH/HPN is considered in this paper, and the traditional soft fractional frequency reuse (S-FFR) is enhanced. Based on the RRH/HPN association constraint and the enhanced S-FFR, an energy-efficient optimization problem with the resource assignment and power allocation for the orthogonal-frequency-division-multiple-access-based H-CRANs is formulated as a nonconvex objective function. To deal with the nonconvexity, an equivalent convex feasibility problem is reformulated, and closed-form expressions for the energy-efficient resource allocation solution to jointly allocate the resource block and transmit power are derived by the Lagrange dual decomposition method. Simulation results confirm that the H-CRAN architecture and the corresponding resource allocation solution can enhance the EE significantly.Keywords
Funding Information
- National Natural Science Foundation of China (61222103)
- National Basic Research Program of China (973 Program) (2013CB336600, 2012CB316005)
- State Major Science and Technology Special Projects (2013ZX03001001)
- Beijing Natural Science Foundation (4131003)
- Specialized Research Fund for the Doctoral Program of Higher Education (SRFDP) (20120005140002)
- National Natural Science Foundation of China (61201174)
- Natural Science Foundation of Jiangsu Province (BK2012325)
- Fundamental Research Funds for the Central Universities
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