Transcript Microwave Access

PART 2. 모바일 웹 2.0에 영향을 주는 요소들
IMS: IP Multimedia Subsystem
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개요
 IMS는 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 애플리케이
션을 생성, 제어, 변화시킬 수 있으며, 영상이나 대용량 데이터 등 멀티
미디어 통신을 효율적으로 구현할 수 있다.
 IMS가 궁극적으로 지향하는 것은 사용자들이 원하는 모든 컨텐츠와 서
비스를 모든 네트워크나 기기로도 접근이 가능하다는 것이다.
 IMS는 당초 IP망을 기반으로 하는 3세대 이동통신(3G)에서 서로 다른
서비스 망간의 상호 연동과 호환을 위한 무선 네트워크 표준안을 마련
하는 과정에서 제안되었지만, 이동통신뿐만 아니라 IP 망을 기반으로
하는 각종 차세대 부가통신 서비스와 유무선 통합을 지원하는 핵심 기
술로 확대 적용되고 있다.
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 IMS 구조 기반 제공 서비스
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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)
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 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
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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 API를 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.
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 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.
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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’.
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WiMAX
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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
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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.
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