## 3 Proposed Optimization Algorithm
### BS Transmit Power Allocation
#### 3.1.2 Two-Layer Approach for Solving Problem (P1)
_arXiv_**2023**, arXiv:2309.02687. * [PERSON] et al. (2024) [PERSON]; [PERSON]; [PERSON] Rapidly time-varying reconfigurable intelligent surfaces for downlink multiuser transmissions. _IEEE Trans. Commun._**2024**. [CrossRef]
* [PERSON] et al. (2023) [PERSON]; [PERSON]; [PERSON] Wireless communications with space-time modulated metasurfaces. _arXiv_**2023**, arXiv:2302.08310. * [PERSON] and [PERSON] (2021) [PERSON]; [PERSON] A Joint Precoding Framework for Wideband Reconfigurable Intelligent Surface-Aided Cell-Free Network. _IEEE Trans. Signal Process._**2021**, _69_, 4085-4101. [CrossRef]
* [PERSON] et al. (2021) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] Beyond Cell-Free MIMO: Energy Efficient Reconfigurable Intelligent Surface Aided Cell-Free MIMO Communications. _IEEE Trans. Cogn. Commun. Netw._**2021**, \(7\), 412-426. [CrossRef]
* [PERSON] and [PERSON] (2021) [PERSON]; [PERSON] Performance Analysis and User Association Optimization for Wireless Network Aided by Multiple Intelligent Reflecting Surfaces. _IEEE Trans. Commun._**2021**, _69_, 6296-6312. [CrossRef]
* [PERSON] et al. (2023) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] User Association for Reconfigurable Intelligent Surfaces Aided Cell-Free Networks. _IEEE Trans. Veh. Technol._**2023**, _72_, 14456-14467. [CrossRef]
* [PERSON] et al. (2024) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] Smart performance optimization of energy-aware scheduling model for resource sharing in 5G green communication systems. _J. Eng._**2024**, _2024_, e12358. [CrossRef]
* [PERSON] et al. (2024) [PERSON]; [PERSON] [PERSON]; [PERSON]; [PERSON]; [PERSON] A lightweight smart contracts framework for blockchain-based secure communication in smart grid applications. _IET Gener. Transm. Distrib._**2024**, _18_, 625-638. [CrossRef]
* [PERSON] et al. (2023) [PERSON]; [PERSON]; [PERSON]; [PERSON] Channel Estimation for Reconfigurable Intelligent Surface Aided Multi-User mmWave MIMO Systems. _IEEE Trans. Wirel. Commun._**2023**, _22_, 6853-6869. [CrossRef]
* [PERSON] and [PERSON] (2019) [PERSON]; [PERSON] Channel Estimation and Low-complexity Beamforming Design for Passive Intelligent Surface Assisted MISO Wireless Energy Transfer. In Proceedings of the 2019 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), Brighton, UK, 12-17 May 2019; pp. 4659-4663. [CrossRef]
* [PERSON] et al. (2020) [PERSON]; [PERSON]; [PERSON]. Matrix-Calibration-Based Cascaded Channel Estimation for Reconfigurable Intelligent Surface Assisted Multiuser MIMO. _IEEE J. Sel. Areas Commun._**2020**, _38_, 2621-2636. [CrossRef]
* [PERSON] et al. (2014) [PERSON]; [PERSON]; [PERSON] Shaping complex microwave fields in reverberating media with binary tunable metasurfaces. _Sci. Rep._**2014**, \(4\), 6693. [CrossRef] [PubMed]
* [PERSON] and [PERSON] (2005) [PERSON]; [PERSON] _Fundamentals of Wireless Communication_; Cambridge University Press: Cambridge, UK, 2005. * [PERSON] (2012) [PERSON] An Efficient Global Optimization Algorithm for Nonlinear Sum-Of-Ratios Problems. 2012. Available online: [[https://optimizationonline.org/2012/08/3586](https://optimizationonline.org/2012/08/3586)]([https://optimizationonline.org/2012/08/3586](https://optimizationonline.org/2012/08/3586)) (accessed on 7 August 2012). * [PERSON] et al. (2019) [PERSON]; [PERSON]; [PERSON] Energy Efficiency of Distributed Antenna Systems With Wireless Power Transfer. _IEEE J. Sel. Areas Commun._**2019**, _37_, 89-99. [CrossRef]
* [PERSON] et al. (2013) [PERSON]; [PERSON]; [PERSON] Global optimization of large-scale mixed-integer linear fractional programming problems: A reformulation-linearization method and process scheduling applications. _AICHE J._**2013**, _59_, 4255-4272. [CrossRef]

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