IMS: IP Multimedia Subsystem

1

• PART 2. ??? ? 2.0? ??? ?? ???
• IMS IP Multimedia Subsystem
• ? ?
• IMS? IP ????? ???? ???, ??, ??? ???? ???? ???? ?
  ?? ??? ????? SIP(Session Initiation Protocol)
  ????? ???? ??.
• IMS ??????? ????? ??? ??? ???? ??????? ??, ??,
  ???? ? ???, ???? ??? ??? ? ????? ??? ????? ??? ?
  ??.
• IMS? ????? ???? ?? ????? ??? ?? ???? ???? ??
  ????? ???? ??? ????? ???.
• IMS? ?? IP?? ???? ?? 3?? ????(3G)?? ?? ?? ??? ???
  ?? ??? ??? ?? ?? ???? ???? ???? ???? ??????,
  ?????? ??? IP ?? ???? ?? ?? ??? ???? ???? ??? ???
  ???? ?? ??? ?? ???? ??.

2

• IMS ?? ?? ?? ???
• VoIP ? ?? ?? ???
• ?? ???/??? ??? ??? ?? ?? ???
• Presence Availability ???
• Instant Messaging ???
• Push-to-Talk ???
• ??? ?? ?? ? ??(??, ?? ?? ?) ???
• ?? ?? ?? ??? ????? ?????? ???
• ??? ???(VoIP??? ??? ?)

3

• IMS ??? ??
• 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

• Principles OpenGardens, Walled gardens and
  Mobile Web 2.0
• Open systems
• Openness itself can mean many tings
• Openness of access for the customer ?? ???? ????
  ? ? ?? ??
• Open APIs / Open platforms ??? API? ???? ?? ??
  ???? ??
• 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

• 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

• 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

• 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.