The rapid development of the Internet of Vehicles(IoVs)underscores the importance of Vehicle-to-Everything(V2X)communication for ensuring driving safety.V2X supports control systems by providing reliable and real-time...The rapid development of the Internet of Vehicles(IoVs)underscores the importance of Vehicle-to-Everything(V2X)communication for ensuring driving safety.V2X supports control systems by providing reliable and real-time information,while the control system's decisions,in turn,affect the communication topology and channel state.Depending on the coupling between communication and control,radio resource allocation(RRA)should be controlaware.However,current RRA methods often focus on optimizing communication metrics,neglecting the needs of the control system.To promote the co-design of communication and control,this paper proposes a novel RRA method that integrates both communication and control considerations.From the communication perspective,the Age of Information(AoI)is introduced to measure the freshness of packets.From the control perspective,a weighted utility function based on Time-to-Collision(TTC)and driving distance is designed,emphasizing the neighboring importance and potentially dangerous vehicles.By synthesizing these two metrics,an optimization objective minimizing weighted AoI based on TTC and driving distance is formulated.The RRA process is modeled as a partially observable Markov decision process,and a multi-agent reinforcement learning algorithm incorporating positional encoding and attention mechanisms(PAMARL)is proposed.Simulation results show that PAMARL can reduce Collision Risk(CR)with better Packet Delivery Ratio(PDR)than others.展开更多
基于Web of Science(WOS)核心合集中2010年以来发表的以“气候变化”“经济”和“影响”为主题词的文献,从知识图谱视角对气候变化经济影响领域的研究主题、演进历程以及前沿热点进行分析。以期通过了解和把握该领域自2010年以来的研究...基于Web of Science(WOS)核心合集中2010年以来发表的以“气候变化”“经济”和“影响”为主题词的文献,从知识图谱视角对气候变化经济影响领域的研究主题、演进历程以及前沿热点进行分析。以期通过了解和把握该领域自2010年以来的研究脉络和热点演变,明确发展趋势,为促进我国气候变化经济影响研究的发展和创新提供参考。结果显示,2010年以来气候变化经济影响研究重点分为6个主题,分别为减排和可持续发展、适应与风险管理、气候公平与发展、土地生态、渔业及生计,以及农业和水安全。近10年来该领域研究的发展主要包括研究对象的扩展以及方法方案的扩展这两条演进路径,且自2017年起热点明显向后者迁移。近年研究前沿主要集中于研究方法和解决方案,包括机器学习、经济技术分析、基于自然的解决方案等。展开更多
基金supported by Beijing Natural Science Foundation under Grant L202018the National Natural Science Foundation of China under Grant 61931005+1 种基金the Key Laboratory of Internet of Vehicle Technical Innovation and Testing(CAICT),Ministry of Industry and Information Technology under Grant No.KL-2023-001the High-performance Computing Platform of BUPT。
文摘The rapid development of the Internet of Vehicles(IoVs)underscores the importance of Vehicle-to-Everything(V2X)communication for ensuring driving safety.V2X supports control systems by providing reliable and real-time information,while the control system's decisions,in turn,affect the communication topology and channel state.Depending on the coupling between communication and control,radio resource allocation(RRA)should be controlaware.However,current RRA methods often focus on optimizing communication metrics,neglecting the needs of the control system.To promote the co-design of communication and control,this paper proposes a novel RRA method that integrates both communication and control considerations.From the communication perspective,the Age of Information(AoI)is introduced to measure the freshness of packets.From the control perspective,a weighted utility function based on Time-to-Collision(TTC)and driving distance is designed,emphasizing the neighboring importance and potentially dangerous vehicles.By synthesizing these two metrics,an optimization objective minimizing weighted AoI based on TTC and driving distance is formulated.The RRA process is modeled as a partially observable Markov decision process,and a multi-agent reinforcement learning algorithm incorporating positional encoding and attention mechanisms(PAMARL)is proposed.Simulation results show that PAMARL can reduce Collision Risk(CR)with better Packet Delivery Ratio(PDR)than others.
文摘基于Web of Science(WOS)核心合集中2010年以来发表的以“气候变化”“经济”和“影响”为主题词的文献,从知识图谱视角对气候变化经济影响领域的研究主题、演进历程以及前沿热点进行分析。以期通过了解和把握该领域自2010年以来的研究脉络和热点演变,明确发展趋势,为促进我国气候变化经济影响研究的发展和创新提供参考。结果显示,2010年以来气候变化经济影响研究重点分为6个主题,分别为减排和可持续发展、适应与风险管理、气候公平与发展、土地生态、渔业及生计,以及农业和水安全。近10年来该领域研究的发展主要包括研究对象的扩展以及方法方案的扩展这两条演进路径,且自2017年起热点明显向后者迁移。近年研究前沿主要集中于研究方法和解决方案,包括机器学习、经济技术分析、基于自然的解决方案等。
