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Ultra Reliable load-aware Connection Management(LACM)Algorithm in WIA-FA Systems

China Communications 2024年第8期21卷 142-161页

作者： Liu Gang Jiang Chunhao Ren Xiaochun Fan Pingzhi Liang Chengchao Ma Zheng Southwest Jiaotong University Chengdu 611756China State Key Laboratory of Rail Transit Engineering Informatization(FSDI) Xi’an 710043China Chongqing University of Posts and Telecommunications Chongqing 400065China

The increasing demand for industrial automation and intelligence has put forward higher requirements for the reliability of industrial wireless communication *** an international standard based on 802.11,Wireless networks for Industrial Automation-Factory Automation(WIA-FA)greatly improves the reliability in factory automation scenarios by Time Division Multiple Access(TDMA).However,in ultra-dense WIA-FA networks with mobile users,the basic connection management mechanism is *** of the handover and resource management algorithms are all based on frequency division multiplexing,not suitable for the TDMA in the WIA-FA ***,we propose load-aware Connection Management(LACM)algorithm to adjust the linkage and balance the load of access devices to avoid blocking and improve the reliability of the *** then we simulate the algorithm to find the optimal settings of the *** comparing with other existing algorithms,the result of the simulation proves that LACM is more efficient in reliability and maintains high reliability of more than 99.8%even in the ultra-dense moving scenario with 1500 field ***,this algorithm ensures that only a few signaling exchanges are required to ensure load bal-ancing,which is no more than 5 times,and less than half of the best state-of-the-art algorithm.

关键词： connection management load-aware multi-connectivity reliability retransmission WIAFA

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load-aware Offloading Strategy in Two-Tier Heterogeneous Network

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China Communications 2016年第8期13卷 148-158页

作者： Jianyuan Feng Zhiyong Feng Zhiqing Wei Key Laboratory of Universal Wireless Communications Ministry of Education Beijing University of Posts and Telecommunications

Although small cell offloading technology can alleviate the congestion in macrocell, aggressively offloading data traffic from macrocell to small cell can also degrade the performance of small cell due to the heavy load. Because of collision and backoff, the degradation is significant especially in network with contention-based channel access, and finally decreases throughput of the whole network. To find an optimal fraction of traffic to be offloaded in heterogeneous network, we combine Markov chain with the Poisson point process model to analyze contention-based throughput in irregularly deployment networks. Then we derive the close-form solution of the throughput and find that it is a function of the transmit power and density of base *** on this, we propose the load-aware offloading strategies via power control and base station density adjustment. The numerical results verify our analysis and show a great performance gain compared with non-load-aware offloading.

关键词： heterogeneous networks offloading strategies load-aware Poisson point process Markov chain throughput maximization CSMA

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维普期刊数据库

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load-aware TOPOLOGY CONTROL IN IEEE 802.16 MESH NETWORK

LOAD-AWARE TOPOLOGY CONTROL IN IEEE 802.16 MESH NETWORK

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2007中国宁波国际计算机科学与技术学术大会

作者： Feng Jing Xia Ran Zhou Huaibei Computer School Wuhan University FiberHome Telecommunications Technologies Co.Ltd. International School of Software Wuhan University

ISBN: (纸本)9780972147903

The IEEE 802.16 standard provides a mechanism for Wireless Metropolitan Area Networks（WMANs） including a mesh mode of operation to improve the coverage and throughput of the ***,the load balancing is not considered in the process of constructing such mesh *** this paper,we analyze the mechanism of network entry and synchronization in a mesh mode,and take the problem of traffic load in such a network into *** present an analytical model based on centralized scheduling tree for computing the load value of one *** a load-aware network entry and synchronization scheme is proposed to control the network topology for load balancing in such a mesh *** simulation results show that the proposed schemes achieve significant improvement and are more effective.

关键词： IEEE 80216 WiMAX load-aware Wireless mesh network

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Partially Overlapped Channels- and Flow-Based End-to-End Channel Assignment for Multi-Radio Multi-Channel Wireless Mesh Networks

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China Communications 2016年第4期13卷 1-13页

作者： WANG Jihong SHI Wenxiao College of Communication Engineering Jilin University

Capacity reduction is a major problem faced by wireless mesh networks. An efficient way to alleviate this problem is proper channel assignment. Current end-toend channel assignment schemes usually focus on the case where channels in distinct frequency bands are assigned to mesh access and backbone, but actually backbone network and access network can use the same IEEE 802.11 technology. Besides, these channel assignment schemes only utilize orthogonal channels to perform channel assignment, and the resulting network interference dramatically degrades network performance. Moreover, Internet-oriented traffic is considered only, and peerto-peer traffic is omitted, or vice versa. The traffic type does not match the practical network. In this paper, we explore how to exploit partially overlapped channels to perform endto-end channel assignment in order to achieve effective end-to-end flow transmissions. The proposed flow-based end-to-end channel assignment schemes can conquer the limitations aforementioned. Simulations reveal that loadaware channel assignment can be applied to networks with stable traffic load, and it can achieve near-optimal performance; Traffic-irrelevant channel assignment is suitable for networks with frequent change of traffic load,and it can achieve good balance between performance and overhead. Also, partially overlapped channels' capability of improving network performance is situation-dependent, they should be used carefully.

关键词： channel assignment: end-to-end partially overlapped channels load-aware traffic-irrelevant

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