3G-324M

3G-324M

3G-324M is the 3GPP umbrella protocol for video telephony in 3G 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 the ITU-T H.324 specification for multimedia conferencing over Circuit switched networks.3G-324M is comprised of the following sub-protocols:
* ITU-T H.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-T H.324 with Annexes A and C for operating in wireless environment

The 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 over UMTS as well as TD-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 mobile 3G services.

Codecs

Audio Codec
*GSM Adaptive Multi-Rate, mandatory
*ITU-T G.723.1, optional

Video Codec
*ITU-T H.263, mandatory
*ITU-T H.261, optional
*MPEG-4 part 2 simple profile 1 level 0, optional
*ITU-T H.264, optional

External 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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