Qiu Xuesong

Towards Multi-user and Network-Aware Web Services Composition

In a composite service for multiple users, users that locate in the different network position are related to network parameters that change dynamically. Therefore, we need a service composition method that can not only handle many user requests, but also adapt to the change of the current network parameters. We use queuing theory and reliability theory to model services, and propose a runtime service composition method. The method obtains multiple service execution paths for each kind of user requests, and chooses the proper candidate service in runtime according to the current network state. The results show that our method is effective and can adapt to the changes of the network parameters.

End-to-end service management architecture and information model for MPLS VPN with dynamic SLA management

MPLS is regarded as a technology for traffic engineering and QoS in IP-network. In this paper, we focus on the management of end-to-end VPN service based on MPLS, including system architecture and information model, which are crucial for ISPs to attract more customers and orders. We designed hierarchical architecture supporting dynamic SLA management, and also defined the supporting service information model by extracting and refining related information from the IETF MIBs. Prototype system has been implemented to verify the feasibility.

Distributed Connectivity Restoration Strategy for Movable Sensor Networks

Failure of one or multiple critical nodes may partition wireless sensor networks into disjoint segments, and thus brings negative effect on the applications. We propose DCRS, a Distributed Connectivity Restoration Strategy to tolerate the failure of one critical node. Because of the energy restriction of sensor nodes, the energy overhead of the recovery process should be minimized to extend the lifetime of the network. To achieve it, we first design a novel algorithm to identify 2-critical nodes only relying on the positional information of 1-hop neighbors and some 2-hop neighbors, and then we present the criteria to select an appropriate backup for each critical node. Finally, we improve the cascaded node movement algorithm by determining whether a node can move to another non-adjacent node directly or not to reduce the number of nodes moved. The effectiveness of DCRS is validated through extensive simulation experiments.

Adaptive Web Services Composition Using Q-Learning in Cloud

Plenty of web services are emerging in clouds. They are distributed, heterogeneous, autonomous and dynamic. These characteristics may make a composite service unstable and inflexible. To adapt to this environment, we propose a machine learning strategy that is developed for and applied to web service composition. This way, the composition framework continually learns which web service candidates are currently best suited to be selected and composed to fulfill more complex tasks. Since the learning process is not stopped, the framework is able to adapt its composition strategies to changing conditions in dynamic environments. A case study is given and the learning algorithm is evaluated and compared to the results of related work, which shows that our method improves the success rate of service composition.

A generic lifecycle-based service management information modeling

The research of service management information model can bring forward the following benefits: unified service planning and provisioning, consistency among the functionality models in the service supply chain and correctness of the mapping between management requirements and management functions. In this paper, we have proposed a lifecycle-based generic modeling method on service management information, which adopts a requirement mapping in a top-down manner to define managed objects in the segments of service lifecycle. The model can be referenced as a meta-model to direct the development of service management systems.The research of service management information model can bring forward the following benefits: unified service planning and provisioning, consistency among the functionality models in the service supply chain and correctness of the mapping between management requirements and management functions. In this paper, we have proposed a lifecycle-based generic modeling method on service management information, which adopts a requirement mapping in a top-down manner to define managed objects in the segments of service lifecycle. The model can be referenced as a meta-model to direct the development of service management systems.

Optimal planning of power distribution communication network using genetic algorithm

This paper proposes a planning mechanism to design and plan the communication network for the smart distribution grid when considering economics, reliability and (n-1)-resilience. From the communications perspective, the smart distribution grid mainly consists of End Nodes (ENs) and Access Points (APs), in particular, a distribution grid planning problem focus on deciding which end nodes are to be enabled as access points. In order to solve the problem, an optimization problem is formulated first, which minimizes the cost of installing APs, meanwhile, the constraints of reliability and (n-1)-resilience should be satisfied simultaneously. Then, an approach based on improved genetic algorithm (GA) is developed to solve the proposed problem. Finally, simulation results in MATLAB testify that the proposed planning mechanism is capable to deal with diverse network size and planning effectively with high flexibility and scalability.

Policy to develop the IMT-2000 network management system

The methodology used to develop the IMT-2000 network management system is introduced. The function architecture, physical architecture of the IMT-2000 network management system are proposed. A prototype scheme of the network management system to manage IMT-2000 wireless networks is presented.

The study and implementation the VPN service management system

After proposed the framework of the VPN service management, the shortage of the current management information modeling methods in the network/service management is analyzed and the advantage of the ODP/UML based modeling method is given. The applying open distributed processing/unified modeling language (ODP/UML) for the management information modeling in the VPN service management is studied in detail. The implementation of the VPN SMS using CORBA is also given.

Network-Aware Web Service Selection in Dynamic Environment

Network positions of multiple users are different, network parameters where Web services locate change due to unpredictable factors. Therefore, we propose a service composition method that can adapt to the changes of the current network parameters for multiple users. The method uses nonlinear programming to select proper candidate service in a short time. The results show that our method has shorter runtime for multiple users than the related works.

Integrated management model for terminal devices in pervasive communication networks

Nowadays configuration parameters about network and service in intelligent terminals are getting more complex. Faults and security risks in the terminal are increasing. These have become key holdbacks for usage of services. So it is necessary to manage the terminals to keep them normal and promote satisfaction from customer. OMA and 3GPP have done researches about management of terminals. But there are some shortages, such as mainly focus on interface instead of functions in the management system, focus on maintenance about equipment instead of customer-aware service, varied information modeling that difficult to share, etc. According to the management requirements of terminals in pervasive communication network, an integrated terminal management model was proposed. A common information model for heterogeneous terminals was given and the reasoning mechanism based on the information model for pervasive communication service was analyzed. Finally, the management model, modeling method and reasoning mechanism were validated by designing and implementing a prototype system under a typical pervasive communication service scenario.