4G

4G or Fourth Generation is future technology for mobile and wireless comunications. It will be the successor for the  3G  network technology. Currently 3G networks are under deployement. Approximatly 4G deployments are expected to be seen around 2010 to 2015.It is expected that in 4 G users will expect more and more bandwidth. A 4G system is expected to provide a comprehensive and secure all-IP based solution where facilities such as IP telephony, ultra-broadband Internet access, gaming services and streamed multimedia may be provided to users.

IP Multimedia Subsystem

This is an architecture for offering multimedia,VOIP services .This supports GSM,CDMA, Wireline, Broadband ..etc different access technologies. Thus each and every susbcriber residing in any place can access internet.It is also intended to allow operators to introduce new services, such as web browsing, WAP and MMS, at the top level of their packet-switched networksThis uses standard IP protocols as defined by IETF. So users will be able to access all their services . For that the interfaces used at the service providers end will also be IP based.

• Presence services
• Full Duplex Video Telephony
• Instant messaging
• Unified messaging
• Multimedia advertising
• Multiparty gaming
• Videostreaming
• Web/Audio/Video Conferencing
• Push-to services, such as push-to-talk, push-to-view, push-to-video.
  These are the areas  of importance when IPMS is implemented.