3G-324M
Encyclopedia
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 two
communicating peers. 3G-324M is an umbrella specification to enable conversational multimedia
communication 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 composed of the following sub-protocols:
The 3G-324M specification using the Circuit switched network allows delay sensitive conversational multimedia services such as:
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.
Video Codec
3GPP
The 3rd Generation Partnership Project is a collaboration between groups of telecommunications associations, known as the Organizational Partners...
umbrella protocol
Communications protocol
A communications protocol is a system of digital message formats and rules for exchanging those messages in or between computing systems and in telecommunications...
for video telephony in 3G
3G
3G or 3rd generation mobile telecommunications is a generation of standards for mobile phones and mobile telecommunication services fulfilling the International Mobile Telecommunications-2000 specifications by the International Telecommunication Union...
mobile networks
Cellular network
A cellular network is a radio network distributed over land areas called cells, each served by at least one fixed-location transceiver known as a cell site or base station. When joined together these cells provide radio coverage over a wide geographic area...
.
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 the 3GPP
3GPP
The 3rd Generation Partnership Project is a collaboration between groups of telecommunications associations, known as the Organizational Partners...
. 3G-324M is based on the ITU-T
ITU-T
The ITU Telecommunication Standardization Sector is one of the three sectors of the International Telecommunication Union ; it coordinates standards for telecommunications....
H.324
H.324
H.324 is an ITU-T recommendation for voice, video and data transmission over regular analog phone lines. It uses a regular 33,600 bit/s modem for transmission, the H.263 codec for video encoding and G.723.1 for audio....
specification for multimedia conferencing over Circuit switched networks.
3G-324M is composed of the following sub-protocols:
- ITU-T H.245H.245H.245 is a control channel protocol used with[in] e.g. H.323 and H.324 communication sessions, and involves the line transmission of non-telephone signals. It also offers the possibility to be tunneled within H.225.0 call signaling messages...
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.324H.324H.324 is an ITU-T recommendation for voice, video and data transmission over regular analog phone lines. It uses a regular 33,600 bit/s modem for transmission, the H.263 codec for video encoding and G.723.1 for audio....
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
TD-SCDMA
Time Division Synchronous Code Division Multiple Access or UTRA/UMTS-TDD 1.28 Mcps Low Chip Rate , is an air interface found in UMTS mobile telecommunications networks in China as an alternative to W-CDMA. Together with TD-CDMA, it is also known as UMTS-TDD or IMT 2000 Time-Division .The term...
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
Session Initiation Protocol
The Session Initiation Protocol is an IETF-defined signaling protocol widely used for controlling communication sessions such as voice and video calls over Internet Protocol . The protocol can be used for creating, modifying and terminating two-party or multiparty sessions...
services such as presence can leverage the strength of both networks to enable new types of differentiated and innovative mobile 3G
3G
3G or 3rd generation mobile telecommunications is a generation of standards for mobile phones and mobile telecommunication services fulfilling the International Mobile Telecommunications-2000 specifications by the International Telecommunication Union...
services.
Codecs
Audio Codec- GSM Adaptive Multi-RateAdaptive Multi-RateThe Adaptive Multi-Rate audio codec is a patented audio data compression scheme optimized for speech coding. AMR was adopted as the standard speech codec by 3GPP in October 1999 and is now widely used in GSM and UMTS...
, mandatory - AMR-WBAMR-WBAdaptive Multi-Rate Wideband is a patented speech coding standard developed based on Adaptive Multi-Rate encoding, using similar methodology as Algebraic Code Excited Linear Prediction...
(G.722.2), optional - ITU-T G.723.1G.723.1G.723.1 is an audio codec for voice that compresses voice audio in 30 ms frames. An algorithmic look-ahead of 7.5 ms duration means that total algorithmic delay is 37.5 ms...
, optional
Video Codec
- ITU-T H.263H.263H.263 is a video compression standard originally designed as a low-bitrate compressed format for videoconferencing. It was developed by the ITU-T Video Coding Experts Group in a project ending in 1995/1996 as one member of the H.26x family of video coding standards in the domain of the ITU-T.H.263...
, mandatory - ITU-T H.261H.261H.261 is a ITU-T video coding standard, ratified in November 1988. It is the first member of the H.26x family of video coding standards in the domain of the ITU-T Video Coding Experts Group , and was the first video codec that was useful in practical terms.H.261 was originally designed for...
, optional - MPEG-4 part 2MPEG-4 Part 2MPEG-4 Part 2, MPEG-4 Visual is a video compression technology developed by MPEG. It belongs to the MPEG-4 ISO/IEC standards. It is a discrete cosine transform compression standard, similar to previous standards such as MPEG-1 and MPEG-2...
simple profile 1 level 0, optional - ITU-T H.264, optional
External links
- 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 Spec - A good explanation on the specification of 3G-324M