YoungWook Cha

A Reservation based Network Resource Provisioning Testbed Using the Integrated Resource Management System

The HPcN (Hybrid & high Performance Convergence Network) in research networks means environment which can provide both computing resource such as supercomputer, cluster and network resource to application researchers in the field of medical, bio, aerospace and e-science. The most representative research network in Korea, KREONET has been developing following technologies through the HERO (Hybrid Networking project for research oriented infrastructure) from 200S. First, we have constructed and deployed a control plane technology which can provide a connection oriented network dynamically. Second, the integrated resource management system technology has been developing for reservation and allocation of both computing and network resources, whenever users want to utilize them. In this paper, a testbed network is presented, which is possible to reserve and allocate network resource using the integrated resource management system. We reserve network resource through GNSI (Grid Network Service Interface) messages between GRS (Global Resource Scheduler) and NRM (Network Resource Manager) and allocate network resource through GUNI (Grid User Network Interface) messages between the NRM (network resource manager) and routers, based on reservation information provided from a user on the web portal. It is confirmed that GUNI interface messages are delivered from the NRM to each router at the starting of reservation time and traffic is transmitted through LSP allocated by the NRM.

Grid Network Management System Based on Hierarchical Information Model

We defined three-hierarchical information model and GNSI (Grid Network Service Interface) to reserve and activate network resources in grid environment. Management scheme of three-hierarchical information model is a little more complicated than that of existing two-hierarchical information model, but our model increases the utilization of network resources by allowing grid application to use several grid network resources over the same path. We designed and implemented grid network management system based on GNSI interface and three-hierarchical information model of network resources. We tested reservation and activation on grid network resources in the test-bed of GMPLS network overlaid over KREONET research network. We also successfully carried out international interoperability test on the control of grid network by deploying FENIUS-API over global research network.

Study of High-Speed NGN Resource Control Schemes

Next generation network (NGN) is a packet-based converged network to support session and non-session services in QoS-enabled broadband transport network. QoS based resource control must be defined to support differentiated services for various network users in NGN. This paper defined parallel control schemes for NGN resource control interfaces to minimize session and resource control delays. We simulated the existing and proposed NGN control schemes to measure and analyze control delays and completion ratios. By arrival rate of 120 in two-phase resource control, we checked out that completion ratios of sequential and parallel schemes achieved 100%, and the control delay of parallel scheme was improved by about 21.5% compared to that of sequential scheme.

Mapping of QoS Information Elements and Implementation of Rs/Rw Interface Resource Control Protocols in NGN

NGN is a packet-based converged network to support session and non-session services in QoS-enabled broadband transport network. QoS based resource control must be defined to support differentiated services for various network users in NGN. We designed and implemented DIAMETER protocol as the Rs interface, and also defined mapping rules between DIAMETER information elements and SDP(Session Description Protocol) attributes for QoS based resource control in NGN. We selected and implemented DIAMETER protocol among alternate resource control protocols in ITU-T as the Rw interface because of simple interworking method with Rs interface and adequate AAA functionality. We defined mapping rules of messages and information elements between Rs and Rw interfaces for resource control from a service layer to a transport layer. Based on the mapping rule of QoS information elements and the interworking method between Rs and Rw interfaces, we built up a test-bed that support differentiated delivery services.

Resource Management and Control in NGN Transport

Next generation network (NGN) is IP based broadband and integrated network of existing communication networks. This paper defines requirements of management information to perform resource admission and path computation for single-phase resource control scheme in NGN transport stratum. We also propose high-speed resource control mechanism based on parallel and single-phase scheme to minimize delay overhead between centralized resource admission control functions and transport functions.

Network management services in GSMP open interface

General switch management protocol (GSMP) is an open interface between a label switch and a controller, and it provides connection, configuration, event, performance management and synchronization. Traditionally, network management services are classified into five categories: those are configuration, performance, fault, accounting, and security management services. Network management functions for these services can be located in the either controller or label switch. We analyzed the complexity of switch implementation and the efficiency of resource usage according to the location of network management functions in the GSMP interface. We also described each network management service and its related managed objects in the GSMP interface.

Policy Definition for Bottom-Up Recovery Scheme in Multilayer Network

For self-healing network, it is essential to deploy coordinated recovery scheme among several layers in multilayer network. By doing root-cause analysis of failures, network recovery function can be performed in the origin layer causing other failures on several layers, and as a result of this recovery function, the damage like service interruption can be prevented or minimized. This paper proposes multilayer network recovery scheme and policies, in which root-cause analysis is integrated with hold-off time of bottom-up recovery scheme.

Definition of Network Resource and Network Service Interface for Grid Network Resource Manager

Grid technology enables high performance computation and mass data processing by connecting geographically distributed computing resources to high-speed network. To carry on grid tasks requiring guaranteed quality of service, we need to build converged infrastructure which controls and manages network resources as well as computing resources. In this paper, we defined grid network service interface and information model to support grid network path, resource creation and reservation. In addition to resource creation and reservation messages of the existing GLIF, grid network path and notification messages were defined in the grid network service interface. We also defined related statuses and messages for two-phase resource reservation mechanism. We designed and implemented network resource management system based on the grid network information model and service interface. We experimented in resource reservation, allocation and release of network resources in grid environment with GMPLS control and transport network.

Performance Evaluation of Web Services-based Topology Management in Centralized Network

This paper deals with Web services-based topology management mechanism in centralized network. We verify the realization of the proposed mechanism by implementing topology management system and show the most suitable development environment by measuring and comparing the performance of bandwidth usage and round-trip delay.

Management Information and Model of GSMP Network Open Interface

General switch management protocol (GSMP) is a network open interface between a label switch and a controller, and it provides connection, configuration, event, performance management and synchronization. There will be two considerations for network management services in GSMP interfaces. The first one is what kind of management information base will be used for network management services in GSMP interface. The second consideration is where network management functions for network management services will be located in GSMP interface. We guided the usage of management information base for each network management service. We proposed the network management model, in which management functions are distributed in a controller and a label switch according to network management services.