Table 1 Requirements and Features of H.264 video communications techniques.
From: Efficient Transmission of H.264 Video over Multirate IEEE 802.11e WLANs
Technique | Supported H.264 profiles | Supported 802.11e WLAN | Application/transport layer tasks | WLAN MAC(and PHY) layer tasks |
|---|---|---|---|---|
(1)  Single  stream served by EDCA | Baseline, extended (all profiles) | EDCA | Limited: tagging all frames with type of service | Serving tagged video in priority levels (AC2) |
(2)  Single  stream served  by CAPS | Baseline, extended (all profiles) | EDCA & HCCA with CAPS | Limited: tagging all frames with traffic stream ID | Requires video pattern information, serving tagged video in guaranteed access traffic session |
(3)  Partitioned video  served by  EDCA | Extended | EDCA | Tagging different partitions for different priority levels | Serving packet of each partition in a different priority level (A: AC2, B & C: AC1) |
(4)  Partitioned video  served  by modified-CAPS | Extended | EDCA & HCCA with CAPS | Tagging different partitions for different traffic streams | Requires video pattern information, serving partition A packets in a separate guaranteed access traffic session from partitions B & C. Within a video stream, partition A's are given absolute priority over B & C |
(5)  Partitioned video,  partially aggregated,  served by  modified-CAPS | Extended | EDCA & HCCA with CAPS | Tagging different partitions for different traffic streams, aggregating partitions B and C (or A & B) | Requires video pattern information, serving partition A packets in a separate guaranteed access traffic session from the aggregated packets of partitions B & C. Within a video stream, partition A's are given absolute priority over B & C |
(6)  Partitioned video,  partially aggregated,  served by  modified-CAPS and customized link adaptation | Extended | EDCA & HCCA with CAPS—multimedia aware link adaptation | Tagging different partitions for different traffic streams, aggregating partitions B and C (or A & B) | Requires video pattern information, serving partition A packets in a separate guaranteed access traffic session from the aggregated packets of partitions B & C. Serving partitions at different PHY rates |