Jae-Oh Lee

The IMS/SDP Structure and Implementation of Presence Service

Nowadays in communication and network business, structure and system are independently constructed with existing IT services and new services (e.g., 3G services) without considering common functions between them. Consequently, the study of standardized Service Delivery Platform (SDP) structure and interfaces can efficiently provide the methodology of existing or new services to users and easier environment for development to service providers. Therefore in this paper, we will find solutions about the SDP structure and then describe the implementation of presence service related to the SDP.

Deploying Application Services Using Service Delivery Platform (SDP)

Nowadays in communication and network businesses, architectures and systems are independently constructed with existing service or new service deployment without considering common functions and services between them. Consequently, the study of standardized Service Delivery Platform (SDP) structure and its related interfaces is needed to provide the methodology of existing or new services in an efficient way. Therefore, in this paper, we intend to view various solutions about SDP structure with the proposed interfaces which are able to support them, and then recommend various application services which SDP can offer to end users.

An implementation of the SDP using common service enablers

The structures and systems of network and communication are independently constructed with existing based-IT service and 3G services without considering common functions between them. Consequently, the study of standardized Service Delivery Platform (SDP) structure and its related interfaces are needed to provide the methodology of existing or new services in an efficient way. Therefore, in this paper, we suggest the structure of common service enablers (i.e., PoC, Presence) for the SDP and show the way of interaction between them. Finally, we will describe an implementation of the components of the SDP using them.

IMS Based PoC Service Deployment

The IP Multimedia Subsystem (IMS) has brought us feasibilities by separating control functions from bearer and services. Multi-Access technology enables us connecting the IMS Core by kinds of network such as wireless, wire-line network and Internet. By IMS Service Delivery Platform (SDP) richness of services have been developed and deployed into realization through its common protocols and interfaces. Push-to-talk over Cellular (PoC) as the outstanding half-duplex Voice over IP (VoIP) application service enables traditional walkie-talkie service over mobile network.. In this paper we will focus on the advantage of PoC service and PoC architecture firstly, and then describes the session flows of PoC service and its simple simulation. At last we make some conclusions.

Push-to-Talk Service Investigation and Improvement

As we all know Push-to-talk service implemented in the Cellular network has deeply enhanced the advantages of traditional Walkie-Talkie service without the limitation of distance. In order to enrich the Multimedia network communication, we have tried to deploy the PoC service into the IMS Service Delivery Platform (SDP). Related work we have done is to simulate PoC service in IP Multimedia Subsystem (IMS) platform in our computer environment by programming. In this paper we will firstly introduce the basic OMA PoC 2.0 architectures with its media control protocols and show some scenarios of its session flow. Then focus on our practical implement of the simulation that has been instantiated by using Java programming to show its capability and convenience. At last we will make some conclusions.

A Dynamic Routing Algorithm for Management of the IMS Nodes Using SNMP

The IMS (IP Multimedia Subsystem) is used for providing multimedia services to network provider. The IMS is composed of many nodes, depending on their function. According to the status (fault, performance, etc.) of each node, we need to provide dynamic routing algorithm. In this paper, we propose a dynamic routing algorithm for management of the IMS nodes using SNMP based on FCAPS (Fault, Configuration, Accounting, Performance and Security) in the IMS network.

Personalized Recommendation Service in the IMS Environments

In this paper, we describe the service generation for providing personalized recommendation service based on Web-service in the IP Multimedia Subsystem (IMS)environments. Because various and many services based on All-IP networks have to be provided to the customer,the service provider must develop value-added services that are like a Personalized Recommendation Service(PRS). The service provider has to generate and serve customized services through analyzing the customers profiles and usage patterns that are recorded on the server. We have implemented the IMS infrastructure on which the PRS is simulated. And that can be provided the digital convergence service and the customized service based on the policy of service provider and the recommendation algorithms based on the analysis of users profiles and usage patterns.

A routing management among CSCFs using management technology

The IP Multimedia Subsystem (IMS) in ALL-IP based next generation communication environment can offer network/service providers various multimedia services (e.g., voice, audio, video and data etc). The IMS is worthy of notice in that it is possible to make wired/wireless convergence and quick service development. The IMS needs an efficient Session Initiation Protocol (SIP)-based routing among Call Session Control Functions (CSCF) in charge of call and session processing. In this paper, we propose a routing management among CSCFs using management technology.

Policy-based differentiated QoS provisioning for DiffServ enabled IP networks

This paper proposes and implements a policy-based QoS management platform for DiffServ enabled IP networks, which specifies QoS policies to guarantee QoS requirements. The proposed platform integrates the function of policy-based management and QoS monitoring by extending the original IETF policy-based management architecture. High-level QoS policies are represented as valid XML documents and are translated to EJB beans in the EJB-based policy server of the platform. The policy distribution and the QoS monitoring are processed using SNMP. This paper also describes the implementation of Linux-based DiffServ routers with DiffServ MIB and analyzes the experimental results using a video streaming system.

A Policy-Based QoS Management Framework for Differentiated Services Networks

DiffServ is a technique to provide QoS in an efficient and scalable way. However, current DiffServ specifications have limitations in providing the complete QoS management framework. This paper proposes a policy-based QoS management framework that supports DiffServ policy beans for managing QoS of DiffServ networks. The management framework is based on IETF policy framework to which EJB technologies are adopted. High-level DiffServ QoS policies are represented as valid XML documents with an XML Schema and are translated to low-level EJB policy beans in the EJB-based policy server. The EJB-based policy server can accomplish both policy distribution and QoS monitoring by using SNMP DiffServ MIB.