12.4. Video Telephony with Data Partitioning

12.4. Video Telephony with Data Partitioning

This scheme has been implemented and has been shown to offer good performance, especially at higher packet loss rates [13].

Data partitioning is known to be useful only when some form of unequal error protection is available. Normally, in single-session RTP environments, even error characteristics are assumed; that is, the packet loss probability of all packets of the session is the same statistically. However, there are means to reduce the packet loss probability of individual packets in an RTP session. A forward error correction (FEC) packet according to RFC 5109 [18], for example, specifies which media packets are associated with the FEC packet.

In all cases, the incurred overhead is substantial but is in the same order of magnitude as the number of bits that have otherwise been spent for intra information. However, this mechanism does not add any delay to the system.

Again, the complete parameter set establishment is performed through control protocol means.