研究目的
To investigate the joint optimization problem with the RB assignment and power allocation subject to the RRH/HPN association and intertier interference mitigation to maximize EE performances in the OFDMA-based H-CRAN system.
研究成果
The H-CRAN architecture and the corresponding resource allocation solution significantly enhance EE performances. The proposed iterative solution converges and outperforms baseline algorithms, demonstrating impressive EE performance gains.
研究不足
The study focuses on the downlink H-CRAN system and assumes sufficient density of RRHs for stable SE and EE performances of HPNs. The intertier interference from RRHs to HUEs is constrained, potentially limiting the applicability in scenarios with varying interference levels.
1：Experimental Design and Method Selection:
The methodology involves formulating an energy-efficient optimization problem with resource assignment and power allocation for OFDMA-based H-CRANs, addressing nonconvexity through reformulation into an equivalent convex feasibility problem.
2：Sample Selection and Data Sources:
The study considers N and M RUEs per RRH occupying RB sets Ω1 and Ω2, respectively, with total K RBs in ΩT.
3：List of Experimental Equipment and Materials:
Remote radio heads (RRHs) and high-power nodes (HPNs) are used, with specific parameters for path loss, channel gain, and power consumption.
4：Experimental Procedures and Operational Workflow:
The process includes optimizing EE performance through iterative algorithms involving outer and inner loops for updating γ and solving the resource allocation problem.
5：Data Analysis Methods:
The Lagrange dual decomposition method is employed to derive closed-form expressions for the energy-efficient resource allocation solution.
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