3G-324M
3G-324Mis the3GPPumbrella protocolforvideo telephonyin3Gmobile networks.
The 3G-324M protocol operates over an established circuit switched connection between two communicating peers. 3G-324M is an umbrella specification to enable conversational multimedia communication over Circuit Switched (CS) networks and has been adopted by the3GPP.3G-324M is based on theITU-TH.324specification for multimedia conferencing overCircuit switchednetworks.[1][2]3G-324M is composed of the following sub-protocols:
- ITU-TH.245for call control
- ITU-T H.223 for bit streams to data packets multiplexer/demultiplexer
- ITU-T H.223 Annex A and B for error handling of low and medium BER detection, correction and concealment
- ITU-TH.324with Annexes A and C for operating in wireless environment
The 3G-324M specification using theCircuit switchednetwork allows delay sensitive conversational multimedia services such as:
- Videoconferencingfor personal and business use
- Multimedia entertainment services
- Telemedicine
- Surveillance
- Live Video Broadcasting– Cable TV On-the-Go
- Video-on-demand(movies, news clips)
3G-324M is agnostic to the actualCircuit switchednetwork that uses it. It can run as easily overUMTSas well asTD-SCDMAnetworks.
3G-324M operating over a circuit switched channel between two communication peers guarantees the fixed-delay quality of service for multimedia communications. CombiningCircuit switched3G-324M services with packet-basedSIPservices such as presence can leverage the strength of both networks to enable new types of differentiated and innovative mobile3Gservices.
Codecs
[edit]Audio Codec
- GSMAdaptive Multi-Rate,mandatory
- AMR-WB(G.722.2), optional
- ITU-TG.723.1,optional
Video Codec
- ITU-TH.263,mandatory
- ITU-TH.261,optional
- MPEG-4 part 2simple profile 1 level 0, optional
- ITU-TH.264,optional
References
[edit]- ^IMTC Press CoverageArchived2017-03-31 at theWayback Machine,International Multimedia Telecommunications Consortium (IMTC), April 1, 2001 to November 16, 2004.
- ^Orr, Eli.News & Analysis: Understanding The 3G-324M Spec,EETimes.com website. January 21, 2003.
External links
[edit]- 3GPP TS 26.111 - Codec for circuit switched multimedia telephony service; Modifications to H.324
- IMTC 3G-324M AG- Interoperability and testing activity group covering the 3G-324M and H.324 protocol
- 3G-324M on Windows Mobile- An interesting article on the integration of 3G-324M into a Windows Mobile operating system
- Understanding the 3G-324M SpecArchived2008-05-17 at theWayback Machine- A good explanation on the specification of 3G-324M