1. UbiM Lab. CU, Korea1 PART 2. 모바일 웹 2.0 에 영향을 주는 요소들 IMS: IP Multimedia Subsystem  개 요  IMS 는 IP 멀티미디어 서비스를 모바일, 유선, 그리고 컨버전스 환경에 서 가능하게 해 주는 개방형 아키텍처로 SIP(Session Initiation Protocol) 시그널링을 기반으로 한다.  IMS 아키텍츠에서는 네트워크나 플랫폼 유형에 관계없이 애플리케이션 을 생성, 제어, 변화시킬 수 있으며, 영상이나 대용량 데이터 등 멀티미 디어 통신을 효율적으로 구현할 수 있다.  IMS 가 궁극적으로 지향하는 것은 사용자들이 원하는 모든 컨텐츠와 서 비스를 모든 네트워크나 기기로도 접근이 가능하다는 것이다.  IMS 는 당초 IP 망을 기반으로 하는 3 세대 이동통신 (3G) 에서 서로 다른 서비스 망간의 상호 연동과 호환을 위한 무선 네트워크 표준안을 마련 하는 과정에서 제안되었지만, 이동통신뿐만 아니라 IP 망을 기반으로 하 는 각종 차세대 부가통신 서비스와 유무선 통합을 지원하는 핵심 기술 로 확대 적용되고 있다.

2. UbiM Lab. CU, Korea2  IMS 구조 기반 제공 서비스  VoIP 및 화상 전화 서비스  기존 교환기 / 지능망 서비스 형태의 각종 부가 서비스  Presence & Availability 서비스  Instant Messaging 서비스  Push-to-Talk 서비스  다자간 화상 회의 및 협업 ( 게임, 파일 공유 등 ) 서비스  각종 세션 제어 기반의 멀티미디어 커뮤니케이션 서비스  혼합형 서비스 (VoIP+ 메신저 서비스 등 )

3. UbiM Lab. CU, Korea3  IMS 통신망 구조  Figure 1 presents a simplified view of the IMS architecture; we have divided the network into three parts: the service layer, the control layer, and the access network. -AS: Application Servers -CSCF: Call Session Control Protocol -HSS: Home Subscriber Service -MRF: Media Resource Function -MGCF: Media Gateway Control Function

4. UbiM Lab. CU, Korea4 Principles: OpenGardens, Walled gardens and Mobile Web 2.0 Open systems  ‘Openness’ itself can mean many tings:  Openness of access for the customer: 어떤 콘텐츠를 액세스를 할 수 있 는 기능  Open APIs / Open platforms: 공개된 API 를 사용하기 위한 어떤 개발자 의 능력  Open source OpenGardens and Walled gardens  A ‘walled garden’ is a mechanism to restrict the user to a defined environment i.e forcing them by some means to stay within the confines of a digital space.  A walled garden is any mechanism for an entity to restrict the user experience by confining the user to a specific region / space as defined by the entity.

5. UbiM Lab. CU, Korea5  OpenGardens/Open systems primarily means ‘open platforms’ when applied to the mobile network operator.  Technologically, in its ultimate form, this approach can be viewed as 'API enabling’ a Telecoms network. API (Applications Programming Interface) is the software that enables service provision by the Mobile operator. The external application can make a software call via the published API, thereby creating a 'plug and play' ecosystem. Mobile Web 2.0 and OpenGardens  Mobile web 2.0 become prevalent because Web 2.0 is all about harnessing collective intelligence. To harness collective intelligence effectively, we need a large ‘body of intelligence’ i.e. a large body of people. Will walled gardens work?  As users matured, they realized that the restrictions were often a hindrance and ultimately, there are lot less restrictions now on AOL.

6. UbiM Lab. CU, Korea6 Principles: Unlimited use price plans for mobile data Why have unlimited use price plans for mobile data?  Unlimited use data price plans are ‘all use can use’ data plans for a fixed monthly data charge. Princilpes: The disruptive potential of Wi-Fi and WiMAX Wi-Fi mesh networks  Wi-Fi (pronounced wye-fye, IPA) also unofficially known as Wireless Fidelity, is a wireless technology brand owned by the Wi-Fi Alliance intended to improve the interoperability of wireless local area network products based on the IEEE 802.11 standards.  Wi-Fi or Wireless LANs is a term which refers to a set of products that are based on the IEEE 802.11 specification. The most popular and widely used Wireless LAN standard at the moment is 802.11b, which operates in the 2.4GHz spectrum along with cordless phones, microwave ovens and Bluetooth.  Wi-Fi enabled computers or PDA can connect to the Internet when in the proximity of an access point popularity called a ‘hotspot’.

7. UbiM Lab. CU, Korea7 WiMAX  WiMAX, the Worldwide Interoperability for Microwave Access, is a telecommunications technology aimed at providing wireless data over long distances in a variety of ways, from point-to-point links to full mobile cellular type access.  WiMAX stands for wireless interoperability for Microwave access and is defined by IEEE 802.16 standards. It is promoted and standardized by the WiMAX forum.  Mobile WiMAX (specified in 802.162-2005), on the other hand, evolved much later. Spectrum issues  Wi-Fi operates in the unlicensed spectrum with 802.11b in the 2.4 GHz and 802.11a in the 5GHz.  WiMAX in the other hand can operate in either licensed or unlicensed frequencies from 2 GHz to 6 GHz.