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A Heuristic Algorithm for QoS Multicast Routing

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Journal of Systems Engineering and Electronics 2002年第4期13卷 73-78页

作者： li layuan & li chunlin Department of Computer Science, Wuhan University of Technology, Wuhan 430063, P. R. China Department of Computer Science Wuhan University of Technology Wuhan 430063 P. R. China

In recent years, QoS multicast routing has continued to be a very important research topic in the areas of networks. This paper presents a heuristic algorithm for the QoS multicast routing (HAQMR). This heuristic algorithm deals with delay and bandwidth constraints and has low cost. The HAQMR attempts to significantly reduce the overhead for constructing a multicast tree, the proof for correctness of the HAQMR is given, and the performance of the HAQMR is evaluated by simulations. The study shows that HAQMR provides an available approach to QoS multicast routing.

关键词： Heuristic QoS Multicast QoS constraints QoS routing.

A Recovery Algorithm for Self-Stabilizing Communication Protocols

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Journal of Systems Engineering and Electronics 2000年第1期11卷 38-46页

作者： li layuan & li chunlin (Department of Computer Science & Technology, Wuhan nansportation University, 430063, P. R. China) Department of Computer Science & Technology Wuhan Transportation University 430063 P. R. China

This paper presents a recovery algorithm for self-stabilizing communication protocols. It first describes some concepts and a formal description method for the algorithm. Then it proposes the algorithm procedures, proves its correctness and analyses its complexity. Finally, it also verifies the availability and efficiency of the algorithm by illustrating an example protocol with multi-processes.

关键词： Computer networks Communication protocols Recovery algorithm Self-stabilization Multimedia communication networks.

The Algorithms for Achieving Global States and Self-Stabilization for Communication Protocols

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Journal of Systems Engineering and Electronics 1999年第4期10卷 34-41页

作者： li layuan & li chunlin(Department of Computer Science & Engineering. Wuhan Transportation University,430063,P . R. China) Department of Computer Science & Engineering. Wuhan Transportation University 430063. P. R. China

This paper discusses the algorithms for achieving global states and self-stabilizationfor communication protocols. It first describes a primary algorithm including its suitability forachieving global states and limitation of self-stabilization for communication protocols, and thenpresents an improved algorithm that can be suitable to achieve global states and can be also usedto self-stabilizing communication protocols. Filially, it gives the proof of correctness and analysis ofcomplexity of the improved algorithm, and verifies its availability and efficiency by illustrating anexample protocol.

关键词： Communication protocols Algorithm for achieving global states Self-stabilization,Computer networks Multimedia communication networks.

Dynamic Routing Protocol for Computer Networkswith Clustering Topology

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Journal of Systems Engineering and Electronics 1999年第1期10卷 44-53页

作者： li, layuan li, chunlin Wuhan Transportation Univ China

This paper presents a hierarchical dynamic routing protocol (HDRP) based on the discrete dynamic programming principle. The proposed protocol can adapt to the dynamic and large computer networks (DLCN) with clustering topology. The procedures for realizing routing update and decision are presented in this paper. The proof of correctness and complexity analysis of the protocol are also made. The performance measures of the HDRP including throughput and average message delay are evaluated by using of simulation. The study shows that the HDRP provides a new available approach to the routing decision for DLCN or high speed networks with clustering topology.

关键词： Computational complexity Computer simulation Dynamic programming Network protocols Topology

Multiple QoS modeling and algorithm in computational grid

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Journal of Systems Engineering and Electronics 2007年第2期18卷 412-417页

作者： li chunlin Feng Meilai li layuan Dept. of Computer Science Wuhan Univ. of Technology Wuhan 430063 P. R. China

Multiple QoS modeling and algorithm in grid system is considered. Grid QoS requirements can be formulated as a utility function for each task as a weighted sum of its each dimensional QoS utility functions. Multiple QoS constraint resource scheduling optimization in computational grid is distributed to two subproblems： optimization of grid user and grid resource provider. Grid QoS scheduling can be achieved by solving sub problems via an iterative algorithm.

关键词： QoS modeling Computational grid Scheduling algorithm.

Self Fault-Tolerance of Protocols: A Case Study

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Journal of Systems Engineering and Electronics 2000年第3期11卷 28-34页

作者： li, layuan li, chunlin Dept. of Computer Science & Technology Wuhan Transportation University 430063 P. R. China

The prerequisite for the existing protocols' correctness is that protocols can be normally operated under the normal conditions, rather than dealing with abnormal conditions. In other words, protocols with the fault-tolerance can not be provided when some fault occurs. This paper discusses the self fault-tolerance of protocols. It describes some concepts and methods for achieving self fault-tolerance of protocols. Meanwhile, it provides a case study, investigates a typical protocol that does not satisfy the self fault-tolerance, and gives a new redesign version of this existing protocol using the proposed approach.

关键词： Protocols Self fault-tolerance Formal method Multimedia communications Protocol engineering.

A Semantics-Based Approachfor Achieving Self Fault-Tolerance of Protocols

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Journal of Computer Science & Technology 2000年第2期15卷 176-183页

作者：李腊元李春林 Department of Computer Science & Technology Wuhan Transportation University Wuhan P.R. China

The cooperation of different processes may be lost by mistake when a protocol is executed. The protocol cannot be normally operated under this condition. In this paper,the self fault-tolerance of protocols is discussed, and a semanticsbased approach for achieving self fault-tolerance of protocols is presented. Some main characteristics of self fault-tolerance of protocols concerning liveness, nontermination and infinity are also presented. Meanwhile, the sufficient and necessary conditions for achieving self fault-tolerance of protocols are given. Finally, a typical protocol that does not satisfy the self fault-tolerance is investigated, and a new redesign version of this existing protocol using the proposed approach is given.

关键词： protocols self fault-tolerance formal method multimedia communications protocol engineering S-T protocol semantics

QoS-aware multicast routing protocol for Ad hoc networks

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Journal of Systems Engineering and Electronics 2006年第2期17卷 417-422页

作者： Sun Baolin li layuan School of Computer Science and Technology Wuhan Univ. of Technology Wuhan 430063. P. R. China Dept. of Mathematics and Physics Wuhan Univ. of Science and Engineering Wuhan 430073. P. R. China

Ad hoe wireless networks consist of mobile nodes interconnected by multihop communication paths. Unlike conventional wireless networks, ad hoc networks have no fixed network infrastructure or administrative support. Due to bandwidth constraint and dynamic topology of mobile ad hoc networks, supporting Quality of Service （QoS） is an inherently complex, difficult issue and very important research issue. MAODV （Multicast Ad hoc Ondemand Distance Vector） routing protocol provides fast and efficient route establishment between mobile nodes that need to communicate with each other. MAODV has minimal control overhead and route acquisition latency. In addition to unicast routing, MAODV supports multicast and broadcast as well. The multicast routing problem with multiple QoS constraints, which may deal with the delay, bandwidth and packet loss measurements is discussed, and a network model for researching the ad hoc network QoS multicast routing problem is described. It presents a complete solution for QoS multicast routing based on an extension of the MAODV routing protocol that deals with delay, bandwidth and packet loss mesurements. The solution is based on lower layer specifics. Simulation results show that, with the proposed QoS multicast routing protocol, end-to-end delay, bandwidth and packet loss on a route can be improved in most of cases. It is an available approach to multicast routing decision with multiple QoS constraints.

关键词： multieast routing routing protocol QoS AODV MAODV.

Distributed QoS multicast routing protocol in ad hoc networks

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Journal of Systems Engineering and Electronics 2006年第3期17卷 692-698页

作者： Sun Baolin li layuan School of Computer Science and Technology Wuhan Univ. of Technology Wuhan 430063 P. R. China Dept. of Mathematics and Physics Wuhan Univ. of Science and Engineering Wuhan 430073 P. R. China

Quality of service （QoS） routing and multicasting protocols in ad hoc networks are face with the challenge of delivering data to destinations through multihop routes in the presence of node movements and topology changes. The multicast routing problem with multiple QoS constraints is discussed, which may deal with the delay, bandwidth and cost metrics, and describes a network model for researching the ad hoc networks QoS multicast routing problem. It presents a distributed QoS multicast routing protocol （DQMRP）. The proof of correctness and complenty analysis of the DQMRP are also given. Simulation results show that the multicast tree optimized by DQMRP is better than other protocols and is fitter for the network situations with frequently changed status and the realtime multimedia application. It is an available approach to multicast routing decision with multiple QoS constraints.

关键词： ad hoc network multicast routing routing protocol QoS.