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December 25, 2011
Understanding the 3G-324M Spec Understanding the 3G-324M Spec: Part 1 When discussing wireless multimedia services, there is quite a bit of space between what people talk about and what reality . For the past few years, many members of the sector have painted a picture of an all IP wireless network that will seamlessly stream audio and video over IP links. In reality, however, the all IP network is far from a reality. Today IPv4 networks are not optimized to handle the delay sensitive applications required on wireless links and do not provide sufficient address space to handle tons of IP-enabled mobiles. At the same time, the high bit-error rates associated with today wireless links, make the delivery of IP packets difficult, to say the least. While the vision of an all IP wireless network has been pushed out, the promise of a feature-rich, multimedia wireless experience has not. This is due to the emergence the 3G-324M standard, which supports the real-time streaming of wireless multimedia services over existing circuit-switched wireless networks. In this two-part series article, we l provide a tutorial of the 3G-324M specification. In Part 1, we l provide an overview of the specification, look at the error resilience and concealment techniques, discuss H.223 multiplexing / demultiplexing, and describe the 3G-324M adaptation layers. In Part 2, we l examine H.245 support, voice coding / decoding, and the video channel. We l also provide insight into some real-life implementation issues. Let kick off our discussion with a look at the problem with delivering multimedia over 3G links. 3G Inability to Deliver Multimedia Over IP The two main 3G standards bodies, 3GPP