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Capacity-Based channel assignment Scheme in Multi-radio Multi-channel Wireless Mesh Networks

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Chinese Journal of Electronics 2015年第2期24卷 419-425页

作者： LI Yangfan WU Peng LIU Xinhua School of Automation Huazhong University of Science and Technology School of Information Engineering Wuhan University of Technology Key Lab. of Broadband Wireless Communications and Sensor Networks Wuhan University of Technology

The capacity of wireless mesh networks can be greatly enhanced by equipping each mesh router with multiple radios and by exploiting multiple channels to reduce network interference. It has been proved that an efficient channel assignment scheme is critical to achieve the optimal network throughput. This paper presents a centralized channel assignment scheme for multi-radio multichannel wireless mesh networks. The scheme includes a spanner-based topology control operation and a linkranking channel assignment algorithm. In the topology control procedure, several links that cause intense interference are removed from the network without damage to the basic network connectivity. The channel assignment procedure improves the network throughput via ranking links based on the principle of load balance. The simulation results demonstrate that the proposed scheme outperforms the compared centralized channel assignment approach in terms of network throughput. The experimental results also indicate that the effectiveness of the proposed scheme is even evident in the case of heavy input traffic load where the potential interference in the network is severe.

关键词： Wireless mesh networks channel assignment Topology control Ranking link

Joint channel assignment and cross-layer routing protocol for multi-radio multi-channel Ad Hoc networks

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Journal of Systems Engineering and Electronics 2010年第6期21卷 1095-1102页

作者： Yang Lu Junming Guan Zhen Wei Qilin Wu School of Computer and Information Hefei University of Technology Heifei 230009 P. R. China Engineering Research Center of Safety Critical Industry Measure and Control Technology of Ministry of Education Hefei 230009 E R. China

To study multi-radio multi-channel （MR-MC） Ad Hoc networks based on 802.11, an efficient cross-layer routing protocol with the function of joint channel assignment, called joint channel assignment and cross-layer routing （JCACR）, is presented. Firstly, this paper introduces a new concept called channel utilization percentage （CUP）, which is for measuring the contention level of different channels in a node’s neighborhood, and deduces its optimal value for determining whether a channel is overloaded or not. Then, a metric parameter named channel selection metric （CSM） is designed, which actually reffects not only the channel status but also corresponding node’s capacity to seize it. JCACR evaluates channel assignment by CSM, performs a local optimization by assigning each node a channel with the smaller CSM value, and changes the working channel dynamically when the channel is overloaded. Therefore, the network load balancing can be achieved. In addition, simulation shows that, when compared with the protocol of weighted cumulative expected transfer time （WCETT）, the new protocol can improve the network throughput and reduce the end-to-end average delay with fewer overheads.

关键词： Ad Hoc network multi-radio multi-channel channel assignment routing protocol channel utilization percentage.

Fairness-oriented routing algorithm joint with power control and channel assignment for multi-radio multi-channel wireless mesh networks

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The Journal of China Universities of Posts and Telecommunications 2014年第5期21卷 55-60页

作者： LIU Kai-ming MA Tao LIU Yuan-an KOU Ke-hao School of Electronic Engineering Beijing University of Posts and Telecommunications Beijing Key Laboratory of Work Safety Intelligent Monitoring Beijing University of Posts and Telecommunications

The multi-radio multi-channel wireless mesh network （MRMC-WMN） draws general attention because of its excellent throughput performance, robustness and relative low cost. The closed interactions among power control （PC）, channel assignment （CA） and routing is contributed to the performance of multi-radio multi-channel wireless mesh networks （MRMC-WMNs）. However, the joint PC, CA and routing （JPCR） design, desired to achieve a global optimization, was poor addressed. The authors present a routing algorithm joint with PC and CA （JPCRA） to seek the routing, power and channel scheme for each flow, which can improve the fairness performance. Firstly, considering available channels and power levels, the routing metric, called minimum flow rate, is designed based on the physical interference and Shannon channel models. The JPCRA is presented based on the genetic algorithm （GA） with simulated annealing to maximize the minimum flow rate, an non-deterministic polynomial-time hard （NP-Hard） problem. Simulations show the JPCRA obtains better fairness among different flows and higher network throughput.

关键词： channel assignment routing power control mesh networks multi-radio multi-channel

3D placement of unmanned aerial vehicles and partially overlapped channel assignment for throughput maximization

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Digital Communications and Networks 2021年第2期7卷 214-222页

作者： Chengming Zou Xiaoxiao Li Xing Liu Mengya Zhang Hubei Key Laboratory of Transportation Internet of Things Wuhan University of TechnologyWuhan430070China School of Computer Science and Technology Wuhan University of TechnologyWuhan430070China Peng Cheng Laboratory Shenzhen518055China Logistics Engineering School Wuhan University of TechnologyWuhan430070China

This paper investigates a wireless system with multi-Unmanned Aerial Vehicles(UAVs)for improving the overall *** contrast to previous studies that optimize the locations of UAVs and channel assignment separately,this paper considers the two issues jointly by exploiting Partially Overlapped channels(POCs).The optimization problem of maximizing network throughput is formulated as a non-convex and non-linear *** order to find a practical solution,the problem is decomposed into two subproblems,which are iteratively ***,the optimal locations of UAVs are determined under a fixed channel assignment scheme by solving the mixed-integer second-order cone ***,an efficient POC allocation scheme is determined via the proposed channel assignment *** results show that the proposed approach not only significantly improves system throughput and service reliability compared with the cases in which only orthogonal channels and stationary UAVs are considered,but also achieves similar performance using the exhaustive search algorithm with lower time complexity.

关键词： Unmanned aerial vehicle Partially overlapped channel Throughput maximization channel assignment

channel assignment Method Using Parallel Tabu Search Based on Graph Theory in Wireless Sensor Networks

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China Communications 2011年第3期8卷 73-82页

作者：郑涛秦雅娟高德云张宏科 National Engineering Laboratory for Next Generation Intemet Interconnection Devices Beijing Jiaotong University

Wireless sensor networks are suffering from serious frequency *** this paper,we propose a channel assignment algorithm based on graph theory in wireless sensor *** first model the conflict infection graph for channel assignment with the goal of global optimization minimizing the total interferences in wireless sensor *** channel assignment problem is equivalent to the generalized graph-coloring problem which is a NP-complete *** further present a meta-heuristic Wireless Sensor Network Parallel Tabu Search(WSN-PTS) algorithm,which can optimize global networks with small numbers of *** results from a simulation experiment reveal that the novel algorithm can effectively solve the channel assignment problem.

关键词： wireless sensor networks channel assignment graph theory Tabu search interference

On channel assignment for Multicast in Multi-Radio Multi-channel Wireless Mesh Networks:A Survey

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China Communications 2015年第1期12卷 122-135页

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

The major challenge faced by wireless mesh networks is the capacity reduction caused by interference,and interference can be reduced or even eliminated through appropriate channel *** article presents a comprehensive survey of channel assignment schemes for multicast in multi-radio multi-channel wireless mesh *** analyze the state-of-the-art channel assignment schemes for multicast and provide comprehensive taxonomy of the latest *** general,we classify the channel assignment schemes for multicast into two types,that is,sequential multicast routing and channel assignment(SMRCA)and joint multicast routing and channel assignment(JMRCA).Detailed review of channel assignment schemes in each category is *** future research directions and corresponding solutions are also explored to motivate research interests in the field of channel assignment for multicast in wireless mesh networks.

关键词： multicast channel assignment interference partially overlapped channels

A TRUST MECHANISM-BASED channel assignment AND ROUTING SCHEME IN COGNITIVE WIRELESS MESH NETWORKS WITH INTRUSION DETECTION

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Journal of Electronics(China) 2010年第5期27卷 728-734页

作者： Wu Guofeng Zhang Jing He Zhaopan Institute of Information Engineering Information Engineering UniversityZhengzhou 450002China

Cognitive Wireless Mesh Networks(CWMN) is a novel wireless network which combines the advantage of Cognitive Radio(CR) and wireless mesh *** can realize seamless in-tegration of heterogeneous wireless networks and achieve better radio resource ***,it is particularly vulnerable due to its features of open medium,dynamic spectrum,dynamic topology,and multi-top routing,etc..Being a dynamic positive security strategy,intrusion detection can provide powerful safeguard to *** this paper,we introduce trust mechanism into CWMN with intrusion detection and present a trust establishment model based on intrusion *** trust degree and the trust degree of data transmission channels between nodes are defined and an algorithm of calcu-lating trust degree is given based on distributed detection of attack to networks.A channel assignment and routing scheme is proposed,in which selects the trusted nodes and allocates data channel with high trust degree for the transmission between neighbor nodes to establish a trusted *** re-sults indicate that the scheme can vary channel allocation and routing dynamically according to network security state so as to avoid suspect nodes and unsafe channels,and improve the packet safe delivery fraction effectively.

关键词： Cognitive Wireless Mesh Networks (CWMN) Intrusion detection Trust mechanism channel assignment Routing

GRAPH COLORING BASED channel assignment FRAMEWORK FOR RURAL WIRELESS MESH NETWORKS

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Journal of Electronics(China) 2013年第5期30卷 436-446页

作者： Zuo Chao Xiong Cong Zhang Han Fang Chang School of Management Hefei University of Technology School of Electrical and Computer Engineering Georgia Institute of TechnologyAtlanta GA 30332-0250 USA College of Information Technical Science Nankai University

IEEE 802.11 based wireless mesh networks with directional antennas are expected to be a new promising technology and an economic approach for providing wireless broadband services in rural *** this paper,we discuss interference models and address how they can affect the design of channel assignment in rural mesh *** present a new channel assignment framework based on graph coloring for rural wireless mesh *** goal of the framework is to allow synchronously transmitting or receiving data from multiple neighbor links at the same time,and continuously doing full-duplex data transfer on every link,creating an efficient rural mesh network without *** assignment is shown to be *** frame this channel allocation problem in terms of Adjacent Vertex Distinguishing Edge Coloring(AVDEC).Detailed assignment results on grid topology are presented and ***,we design an ***,we evaluate the performance of the proposed algorithm through extensive simulations and show the algorithm is effective to the regular grid topologies,and the number of colors used by the algorithm is upper bounded by+*** the algorithm guarantees that the number of channels available in standards such as IEEE802.11a is sufficient to have a valid AVDEC for many grid *** also evaluate the proposed algorithm for arbitrary *** algorithm provides a lower upper bound on the minimum number of channels to the AVDEC index channel assignment problem.

关键词： IEEE 802.11 Rural mesh networks channel assignment Adjacent Vertex Distinguishing Edge Coloring(AVDEC

A channel assignment ALGORITHM VIA CONFLICT SHIFTING FOR DISTRIBUTED COGNITIVE NETWORKS

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Journal of Electronics(China) 2010年第5期27卷 647-654页

作者： Gong Minkang Ren Pinyi Department of Electronic Engineering Xi＇an Jiaotong UniversityXi＇an 710049China

channel assignment is a challenge for distributed cognitive networks due to spectrum mobility and lack of centralized *** present a dynamic and efficient algorithm via conflict shifting,referred as Shifting-based channel assignment(SCA).In this algorithm,the system was modeled with a conflict graph,and users cannot assign the channels that primary users(legacy users) and neighbors already *** order to eliminate the conflicts between neighbors efficiently,secondary users(unlicensed users) try to transfer them through a straight path to the boundary,where conflicts are easier to solve as there are less neighbors for boundary *** in one shift are executed in slots,and users act in a synchronous and separated *** a result,some of the conflicting channels are avoid from directly abandoned,and for this,utility of the entire network can be *** results show that the proposed algorithm can provide similar utility performance while obviously reducing the communication cost than bargaining-base *** small scale networks with low user mobility(under 20%),it reduces 50% of the communication overhead than the later.

关键词： Distributed cognitive network channel assignment Shifting-based channel assignment (SCA)