- 3G-324M
3G-324M is the
3GPP umbrella protocol forvideo telephony in3G mobile networks.The 3G-324M protocol operates over an established circuit switched connection between twocommunicating peers. 3G-324M is an umbrella specification to enable conversational multimediacommunication over Circuit Switched (CS) networks and has been adopted by the
3GPP . 3G-324M is based on theITU-T H.324 specification for multimedia conferencing overCircuit switched networks.3G-324M is comprised of the following sub-protocols:
* ITU-TH.245 for 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.324 with Annexes A and C for operating in wireless environmentThe 3G-324M specification using the
Circuit switched network allows delay sensitive conversational multimedia services such as:
* Video Conferencing for 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 actual
Circuit switched network that uses it. It can run as easily overUMTS as well asTD-SCDMA networks.3G-324M is a proven solution for conversational multimedia based services that packet-based wireless networks cannot deliver because of inherent overhead, BER sensitivity, and variant routing delays. 3G-324M operating over a circuit switched channel between two communication peers guarantees the fixed-delay quality of service for multimedia communications. Combining
Circuit switched 3G-324M services with packet-based SIP services such as presence can leverage the strength of both networks to enable new types of differentiated and innovative mobile3G services.Codecs
Audio Codec
*GSMAdaptive Multi-Rate , mandatory
*ITU-TG.723.1 , optionalVideo Codec
*ITU-TH.263 , mandatory
*ITU-TH.261 , optional
*MPEG-4 part 2 simple profile 1 level 0, optional
*ITU-TH.264 , optionalExternal links
* [http://www.imtc.org/activity_groups/act_3g324m/home.asp IMTC 3G-324M AG] - Interoperability and testing activity group covering the 3G-324M and H.324 protocol
* [http://www.pocketpcmag.com/_archives/oct06/mobilevideo.aspx 3G-324M on Windows Mobile] - An interesting article on the integration of 3G-324M into a Windows Mobile operating system
* [http://www.commsdesign.com/design_corner/OEG20030121S0009 Understanding the 3G-324M Spec] - A good explanation on the specification of 3G-324M
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