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Task Offloading in Dynamic Energy Splitting STAR-RIS Assisted NOMA-MEC Systems with Decomposition Based Multi-Agent DRL

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IEEE Transactions on Vehicular Technology 2025年

作者： Lu, Baoshan Fang, Junli Hong, Xumin Shi, Jianghong Guilin University of Electronic Technology Guangxi Wireless Broadband Communication and Signal Processing Key Laboratory Guilin541004 China Guangxi Normal University Key Laboratory of Nonlinear Circuits and Optical Communications Guilin541004 China Guangxi Normal University Guangxi Key Lab of Multi-source Information Mining & Security Guilin541004 China Xiamen University Department of Informatics and Communication Engineering Xiamen361000 China

This paper explores a system that integrates non-orthogonal multiple access (NOMA) with mobile edge computing (MEC), supported by a simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) in energy splitting (ES) mode. We aim to address the challenge of minimizing energy consumption over the long-term by modeling it as a non-convex optimization problem. To simplify the resolution of this complex issue, we introduce a decomposition approach using a multi-agent deep reinforcement learning (DRL) technique. Specifically, we decompose the problem into the sub-problems of computational resource and power allocation, and phase shifting, amplitude coefficient, offloading ratio, and time optimization. Based on theoretical derivations, we determine the optimal computational resource and power allocation for the given phase shifting, amplitude coefficient, offloading ratio, and time. Then, we propose a multi-agent twin delayed deep deterministic policy gradient (TD3) algorithm to jointly optimize phase shifting, amplitude coefficient, offloading ratio, and time for each time slot. Simulation outcomes demonstrate that the decomposition-based multi-agent TD3 (DB-MATD3) algorithm achieves faster convergence compared to conventional centralized DRL approaches. Compared with other existing methods, the proposed task offloading strategy, which employs the ES-based STAR-RIS, achieves energy savings of 28.7% to 40.8%. © 2025 IEEE.

关键词： Convex optimization

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Cooperative HARQ protocol and diversity analysis of systems with multiple incremental relays

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The Journal of China Universities of Posts and Telecommunications 2009年第5期16卷 8-13页

作者： FAN Bin , WANG Wen-bo, LIN Yi-cheng, ZHENG Kan wireless signal processing and Network lab, key laboratory of universal wireless communication, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876, China [a]Wireless Signal Processing and Network Lab Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China

wireless networks contain an inherent distributed spatial diversity that can be exploited by relays. Relay networks can take advantage of the broadcast-oriented nature of wireless transmission, but require more radio resource to transmit data for their multi-hop traits. Fortunately, incremental relaying technique, which can choose direct or multi-hop transmission adaptively, can efficiently utilize resource. In this article, the incremental transmission with amplify-and-forward （AF） relays is focused on. A practical hybrid-automatic retransmission request （HARQ） protocol is designed, and the related optimal relay selection strategy is proposed. To analyze the cooperative diversity of system with the proposed protocol, the capacity lower bound is deduced. Simulation and analytical results indicate that by adopting the optimal relay selection strategy, the system with the proposed HARQ protocol can achieve an order of cooperative diversity that equals the aggregated number of the relay and source nodes.

关键词： cooperative HARQ AF incremental relay diversity gain

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Quality of service aware admission control in cognitive device-to-device network

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The Journal of China Universities of Posts and Telecommunications 2011年第5期18卷 22-29,36页

作者： FU Zi-xi HU Chun-jing PENG Tao LU Qian-xi WANG Wen-bo Wireless Signal Processing and Network Lab Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China

A hybrid system of cellular mode and device-to-device （D2D） mode is considered in this paper, where the cellular resource is reused by the D2D transmission. With the objective of capacity maximization, the power optimization of D2D sub-system is considered, taking into account quality of service （QoS） requirement. The power optimization problem is divided into two stages： The first stage is the admission control scheme design based on the QoS requirement of D2D users, and the second is power allocation to maximize aggregate throughput of admissible D2D users. For the D2D admission control problem, a heuristic sorting-based algorithm is proposed to index the admissible D2D links, where gain to Interference ratio （GIR） sorting criterion is used. Applying an approximate form of Shannon capacity, the power allocation problem can be solved by convex optimization and geometric programming tools efficiently. Based on the theoretical analysis, a practical algorithm is proposed. The precision can reach a trade-off between complexity and performance. Numerical simulation results confirm that combining with GIR sorting method, the proposed scheme can significantly improve the D2D system＇s capacity and fairness.

关键词： cognitive radio QoS power control geometric programming sorting-based algorithm

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Graph theory based physical cell identity self-configuration for LTE-A network

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The Journal of China Universities of Posts and Telecommunications 2013年第1期20卷 101-107页

作者： WEI Yao WANG Wen-bo PENG Mu-gen MIN Shi-jun Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications Wireless Signal Processing and Network Laboratory Beijing University of Posts and Telecommunications

Self-configuration of physical cell identity （PCI） is a key feature for the long term evolution advanced （LTE-A） network. The PCI is used to identify the different cells in the system, becoming an essential cell configuration parameter. Considering the uncoordinated deployments of the evolved Node B （eNodeB） and the limited number of PCI, the PCI assignment for cells would be quite complex. This paper presents and puts forward a graph theory based centralized PCI self-configuration scheme （GT-PCIS）. The PCI self-configuration problem is mapped to the well-known minimum spanning tree （MST） problem in order to optimize the PCI reuse distance and decrease the multiplexing interference throughout the entire network. The proposal provides a greedy search to make the locally optimal selection of PCI at each stage, and to achieve a global optimum. To demonstrate the algorithm validity, performances of GT-PCIS and manual configuration are evaluated. Simulation results show that the proposed GT-PCIS outperforms other configuration algorithms even under the condition of severe PCI deficiency.

关键词： LTE-A PCI MST self-configuration

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Analysis and Optimization on Partition-Based Caching and Delivery in Satellite-Terrestrial Edge Computing Networks

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China communications 2023年第3期20卷 252-285页

作者： Peng Wang Xing Zhang Jiaxin Zhang Shuang Zheng Wenhao Liu Wireless Signal Processing and Network Laboratory Key Laboratory of Universal Wireless CommunicationMinistry of EducationSchool of Information and Communication EngineeringBeijing University of Posts and TelecommunicationsBeijing 100876China

As a viable component of 6G wireless communication architecture,satellite-terrestrial networks support efficient file delivery by leveraging the innate broadcast ability of satellite and the enhanced powerful file transmission approaches of multi-tier terrestrial *** the paper,we introduce edge computing technology into the satellite-terrestrial network and propose a partition-based cache and delivery strategy to make full use of the integrated resources and reducing the backhaul *** on the interference effect from varied nodes in different geographical distances,we derive the file successful transmission probability of the typical user and by utilizing the tool of stochastic *** the constraint of nodes cache space and file sets parameters,we propose a near-optimal partition-based cache and delivery strategy by optimizing the asymptotic successful transmission probability of the typical *** complex nonlinear programming problem is settled by jointly utilizing standard particle-based swarm optimization(PSO)method and greedy based multiple knapsack choice problem(MKCP)optimization *** results show that compared with the terrestrial only cache strategy,Ground Popular Strategy,Satellite Popular Strategy,and Independent and identically distributed popularity strategy,the performance of the proposed scheme improve by 30.5%,9.3%,12.5%and 13.7%.

关键词： edge computing satellite terrestrial net-works caching deployment stochastic geometry 6G networks

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Performance evaluation of channel inversion precoding for downlink multi-user MIMO system

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The Journal of China Universities of Posts and Telecommunications 2009年第5期16卷 20-24页

作者： CHEN Zhi-yong , WANG Wen-bo, PENG Mu-gen, LI Ren wireless signal processing and Network laboratory, key laboratory of universal wireless communication, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876, China [a]Wireless Signal Processing and Network Laboratory Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China

In downlink multi-user multi-input multi-output （MU-MIMO） system, not every user （user equipment （UE）） can calculate accurately signal to interference and noise ratio （SINR） without prior knowledge of the other users＇ precoding vector. To solve this problem, this article proposes a channel inversion precoding scheme by using the lower bound of S1NR and zero-forcing （ZF） algorithm. However, the SINR mismatch between lower bound SINR and actual SINR causes the inaccurateness of adaptive modulation and coding （AMC）. As a result, it causes degradation in performance. Simulation results show that channel inversion precoding provides lower throughput than that of single user multi-input multi-output （SU-MIMO） at high signal-to-noise ratio （SNR）（〉14 dB）, due to the SINR mismatch, although the sum-rate of channel inversion precoding is higher than that of SU-MIMO at full SNR regime.

关键词： MU-MIMO channel inversion precoding CQI feedback AMC lower bound S1NR zero-forcing

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Joint power and rate control considering fairness for cognitive radio network

Joint power and rate control considering fairness for cognit...

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2009 IEEE wireless communications and networking Conference, WCNC 2009

作者： Zhu, Yajun Sun, Zhenqiang Wang, Wei Peng, Tao Wang, Wenbo Wireless Signal Processing and Networking Lab Key Laboratory of Universal Wireless Communication Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781424429486

In cognitive radio networks, the unlicensed users can utilize the unoccupied licensed spectrum opportunistically. In this paper, we propose a joint power and end-to-end rate control algorithm considering restricting the interference to licensed users. By duality theory, the optimal resource allocation solution is given for the unlicensed users while satisfying the interference temperature limits. An asynchronous algorithm is proposed to be implemented in practical networks. Finally, we give a discussion to the proposed algorithm's performance on fairness. Numerical results show that the proposed algorithm can limit the interference to licensed user under a predefined threshold while maintaining a satisfied data rate fairly. © 2009 IEEE.

关键词： Cognitive radio

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Inter-carrier Interference Analysis and Mitigation for OFDM System over Fast Fading Channels

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电子学报(英文版) 2010年第1期19卷 181-186页

作者： PENG Yuexing ZHAO Hui WANG Wenbo Key Lab of Universal Wireless Communications Ministry of Education Wireless Signal Processing and Network Lab Schoolof Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing China

Inter-carrier interference (ICI) due to Doppler spread is analyzed for OFDM system in highly mobile applications, and then an iterative ICI mitigation method is developed. With the Jakes' model for the Doppler power spectrum and linear model in one OFDM symbol interval for time-varying channel, the analytical closed-form expression of signal-to-interference ratio (SIR) and signal-to-interference-plus-noise ratio (SINR) are developed with neither assumption on the statistical characteristic of ICI nor constraint on the statistical model for the fading channels. Then, a joint detection algorithm is proposed to iteratively mitigate ICI and estimate channel and detect symbols, where the ICI from a few neighboring interfering subcarriers which contribute the majority of ICI power is regenerates and partially subtracted from the received signal in order to mitigate decision error accumulation. The number of concerned interfering subcarriers and the optimal partial ICI cancellation factor are investigated for the tradeoff of complexity reduction and Mean square error (MSE) minimization. Simulation results verify the proposed method can mitigate ICI effectively.

关键词： OFDM系统干扰分析衰落信道运营商信号干扰比减灾线性模型统计特性

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Route selection strategies in cellular networks with two-hop relaying

Route selection strategies in cellular networks with two-hop...

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5th International Conference on wireless communications, networking and Mobile Computing, WiCOM 2009

作者： Zhangchao, Ma Zheng, Kan Wang, Wenbo Liu, Yang Wireless Signal Processing Lab. Key Laboratory of Universal Wireless Communication Beijing China

ISBN: (纸本)9781424436934

In the relay enhanced cellular network (REC), user terminals can flexibly select transmission routes to get service. This paper investigated the effect of route selection schemes on the system performance of REC. Besides the traditional schemes based on signal power and signal-to-interference-plus-noise- ratio (SINR), we evaluated the effective spectral efficiency (SE) based approach which takes into account the feature of multihop transmission. We compared these three schemes through system level simulation, which is based on 3GPP LTE system enhanced with 2-hop fixed relay nodes. The results confirm that the SE-based scheme outperforms the other two schemes. Moreover, the results show that the effect of route selection heavily depends on the position of RNs. The REC system with signal power or SINR based route selection scheme yields even worse throughput than the non-relay case at certain positions. However, the SE-based scheme can always guarantee the gain from relaying. ©2009 IEEE.

关键词： Spectrum efficiency

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Bit error probability of distributed Turbo coded relay systems over quasi-static Rayleigh fading channels

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The Journal of China Universities of Posts and Telecommunications 2010年第2期17卷 41-45页

作者： PENG Yue-xing WU Mu-zi ZHAO Hui WANG Wen-bo Wireless Signal Processing and Network Laboratory Key Lab of Universal Wireless Communications Ministry of Education School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing 100876 China

As is known, distributed Turbo coding （DTC） performs close to the theoretic outage probability bound of a relay channel when correct decoding is assumed at the relay. However, decoding error is inevitable in practical fading channels due to the error-prone feature of radio channels, and the decoding error propagation in DTC scheme will severely degrade the error performance of the relay system. As a result, it is necessary to evaluate the error performance of the DTC scheme in multi-hop relaying wireless systems in practical fading channels. Moreover, the theoretical method of analysis provides an effective tool for obtaining the error performance besides lengthy simulations. In this article, the concept of equivalent signal-to-noise ratio （SNR） of the two-hop relay channel and the method of computing equivalent SNR are developed, and then the upper bound on the bit error probability （BEP） of DTC relay systems is analyzed by use of Turbo code＇s distance spectrum, the concept of uniform interleaver, the limit-before-averaging technique, and the union bound method. Both theoretical analysis and numerical simulation are implemented for relay systems with DTC scheme over quasi-static Rayleigh fading channels. The results show that the upper bound approaches the simulation results in the medium to high SNR region.

关键词： bit error probability distributed Turbo code relay network union bound distance spectrum SNR

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