• Title/Summary/Keyword: Presence Service

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An Authorization Method for Presence Service in VoIP Service (프레즌스 서비스 제공을 위한 XCAP 권한관리 기법 연구)

  • Lee, Tai-Jin;Kim, Hyung-Jong
    • Convergence Security Journal
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    • v.8 no.1
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    • pp.79-90
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    • 2008
  • Services over SIP protocol are anticipated to be commonly used services in our usual life. Especially, presence is a new feature in SIP-based services and actually entities' presence information has close relationship with privacy of them. Also, the XCAP-based authorization is accepted as a highly probable method to protect privacy of entities in SIP-based services. However, there is no proposed presence service model except IM service and it's hard to find the reference model that shows a way how we can apply XCAP-based authorization method into presence service. In this paper, we proposed new presence service model which is applicable to the VoIP service. We suggested presence service model which is making use of XCAP-based authorization to get protection of privacy in a organized way and the suggested model's each messaging steps were reviewed using concrete examples. Contributions of this work is in the suggestion of privacy-aware presence service using XCAP-based authorization and its verification of its each messaging step.

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SIP based IP Multimedia Network (SIP기반의 IP Multimedia Network 구축)

  • Jung Jung-Moon
    • 한국정보통신설비학회:학술대회논문집
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    • pp.223-225
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    • 2003
  • Session Initiation Protocol(이하 SIP)은 H.323 network에서 제기된 문제점을 해결하고 다양한 multimedia service를 제공하기위해 IETF에서 정의된 protocol로서, 3GPP의 IP Multimedia Subsystem(이하 IMS)의 기반 protocol로 채택되었다. IMS는 multimedia service를 제공하기 위한 infrastructure로서 CSCF, HSS, MRF, MGCF, IM-GW등 기능적으로 분리된 여러 entity로 구성되며, 향후 추가될 다양한 부가 service에 유연하게 대처할 수 있는 Application Server(이하 AS) mechanism을 포함하고 있다. 현재 AS mechanism을 이용하여 3GPP규격 상에 정의된 대표적 서비스는 presence service이며, presence service network은 presence server, presence agent, presence proxy, watcher등으로 구성된다. 마지막으로 상기에 언급한 규격을 바탕으로 실제 구축된 Instant messaging/presence service network을 제시한다. (본문 참조)

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A Design and Implementation of a Mobile Instant Messaging System with Extensible Presence Capabilities (확장성 있는 프레전스 기능을 가진 무선 인스턴트 메시징 시스템 설계 및 구현)

  • Nah Jae-Wook;Choi Jin-Yeong;Cho Hyun-Duk;Kim Yong-Hoon;Lee Jin-Gu;Park Jong-Tae
    • Journal of KIISE:Information Networking
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    • v.33 no.3
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    • pp.257-268
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    • 2006
  • In this paper, we have designed and implemented mobile instant messenger which has extensible presence service capability. Most previous work on instant messaging system has some limitation with regard to interoperability and extensibility. To solve these problems, we have employed the presence service architecture of IETF. In order to provide extensible presence capability in the wireless mobile communication, we have employed the presence service attributes which are defined in OMA's IMPS architecture. In particular, we have designed and implemented the presence service libraries for manipulating the presence information in response to user's requirement. finally, we have developed the wireless E-mail service, employing the presence service architecture, to verity the extensibility.

Identification of the Structural Relationship between Presence, Service Quality, Flow and Learning Satisfaction in Mobile Learning (모바일러닝에서 실재감, 서비스의 질, 학습몰입 및 학습만족도 간의 구조적 관계 규명)

  • Joo, Young-Ju;Chung, Ae-Kyung;Kang, Jeong-Jin;Jung, Bo-Kyung
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.15 no.4
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    • pp.169-175
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    • 2015
  • The purpose of this study is to investigate the structural relationships among teaching presence, cognitive presence, social presence, service quality, learning flow, and learners' satisfaction in mobile learning. Survey data collected by 255 learners who completed mobile-supported courses offered by an online university in South Korea were analyzed using structural equation modeling. The results suggest that cognitive presence, social presence, and service quality have direct effects on learning flow, and that cognitive presence, service quality, and learning flow have direct effects on learners' satisfaction.

XMPP/SIP Presence Service System using Efficient Message Control Method (효율적 메시지 제어방식을 사용한 XMPP/SIP 프레즌스 서비스 시스템)

  • Jang, Choonseo
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.18 no.11
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    • pp.2678-2684
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    • 2014
  • In this paper a new message control method that can reduce server load and network traffic in XMPP/SIP presence service system has been proposed. This presence service system can process both XMPP(Extensible Massaging and Presence Protocol) based presence information and SIP(Session Initiation Protocol) based presence information. A new XMPP stanza architecture with added elements for presence stanza and IQ stanza has been designed, and a new presence information data processing method which can reduce size of SIP notification message and SIP PUBLISH message has been suggested. Furthermore a messages exchanging procedure that can transfer presence information between XMPP domain and SIP domain has been also suggested. The performance of the proposed system has been analysed by simulation.

A Study on a New SIP Presence Service using Partial Publication and Extended Call Processing Language (부분 Publication 및 확장 호처리언어를 사용한 새로운 SIP 프레즌스 서비스에 관한 연구)

  • Lee, Ki-Soo;Jang, Choon-Seo;Jo, Hyun-Gyu
    • The Journal of the Korea Contents Association
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    • v.7 no.3
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    • pp.34-41
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    • 2007
  • The presence service which provides user's presence information by subscription and notification is one of SIP(session initiation protocol) extension services, and it is used importantly in VoIP(Voice over IP) and Instant Messaging service. In this paper, we propose a new method in which users can combine and control presence service and call processing services in various ways by extending call processing language, and only changed parts of the presence information are published instead of full presence information document. Each user registers full presence information document with his own call processing script during the first publication to a presence server. The presence server executes these call processing scripts, so it can provide various services with combination of presence service and call processing services during the presence subscriptions and notifications. Afterwards, users publish only changed parts of the presence information and the presence server notify only these changed parts to watchers. Therefore the efficiency of the overall system can be improved. The performance of our proposed model is evaluated by experiments.

A Multiple Servers Presence Service System using SIP based CCMP Control Messages (SIP 기반 CCMP 제어 메시지를 사용한 다중 서버 프레즌스 서비스 시스템)

  • Jang, Choonseo
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.12 no.6
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    • pp.547-553
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    • 2019
  • Presence server should process massive SIP subscription request messages and massive presence event notifications from presence resources in real time. Therefore multiple servers architecture is needed for presence service system. In this paper, an architecture of multiple servers presence service system using SIP based CCMP control messages for lowering presence server load level has been presented. In this system, each presence server exchanges current load status using CCMP control messages, and total system load according to variance of users number and amount of presence resources has been effectively distributed processed. The CCMP control messages has been optimally designed to control presence servers, and exchange procedures of these control messages between presence servers has been also presented and the performance of the proposed multiple servers presence service system has been analysed by experiments. The result shows that average presence subscription processing time reduced from 40.8% to 69.2% and average presence notification processing time reduced from 29.4% to 62.7%.

Deploying a Presence Service on the SDP/IMS (SDP/IMS 기반의 Presence 서비스 구현)

  • Cho, Jae-Hyoung;Lee, Jae-Oh
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.33 no.11B
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    • pp.998-1004
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    • 2008
  • Nowadays, in network business and communication, structures and systems are independently constructed with existing IT services and 3G services without considering common functions between them. In order to solve these problems, the study on the structure and interface of the SDP can efficiently provide the methodology of existing or new services to users and easily develop to service providers. In this paper, we will suggest an adequate structure of the SDP, and then present the implementation of a presence service enabler that is one of basic components in the SDP.

A Large Scale Distributed Presence Service System by SIP Message Control Session (SIP 메시지 제어 세션에 의한 대용량 분산 프레즌스 서비스 시스템)

  • Jang, Choonseo
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.11 no.5
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    • pp.514-520
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    • 2018
  • Presence service provides various information about users such as locations, status of on/offline and network access methods, and number of presence resources required by each users increases largely in mobile environment. Therefore an effective method which can reduce load of presence servers is needed. In this paper, a large scale distributed presence service system which can distribute effectively total presence system load of presence servers using message control session has been presented. This large scale distributed presence service system provides various presence information for massive volumes of users. In this study, a new message control session architecture which can dynamically distribute loads of the presence servers to multiple servers has been presented, and a new presence information data architecture for controlling load of the presence servers has been designed. In this architecture, each presence server can exchange current load level in real time to get variance of the total system load change according to user numbers, and can distribute system load to maintain load level of each server evenly. The performance of the proposed large scale distributed presence service system has been analysed by experiments. The results has been showed that average presence resource subscription processing time reduced from 42.6% to 73.6%, and average presence notification processing time reduced from 37.6% to 64.8%.

Design and Implementation of SIP-based Multi-party Conference System Including Presence Service (Presence 서비스를 포함한 SIP 기반의 다자간 컨퍼런스 시스템의 설계 및 구현)

  • Jung Young-Myun;Ko Se-Lyung;Jang Choon-Seo;Jo Hyun-Gyu
    • The Journal of the Korea Contents Association
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    • v.5 no.2
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    • pp.257-266
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    • 2005
  • As developing of the internet and computer technology, more interests are gathered to the conference service which provides capability of multi-party real-time visual conference. In this paper, we have designed and implemented a SIP-based visual conference system which includes Presence service. The elements of this conference system are user system, which has conference UA(User Agent) capability, presence seuer and conference server. For the presence service, we have adapted publication method which uses SIP PUBLISH message, and with this service various status informations of users are easily acquired. Also invitations and involvements to the conference are easily made through this service. For the conference server which controls establishment and management of multi-party connections, we have included conference event package. This package provides dynamically changing conference informations and users informations through SIP subscription and notification functions.

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