E.6 Bi-directional video (H.264 AVC level 1.1, 192 kbps, IPv4, RTCP and MBR=GBR bearer)
26.1143GPPIP Multimedia Subsystem (IMS)Media handling and interactionMultimedia telephonyRelease 18TS
The video bandwidth is assumed to be 192 kbps and the IPv4 overhead 10 kbps (assuming 15fps and 2 IP packets per frame), resulting in 202 kbps. The transfer delay for video is different from other media. The applicable H.264 profile level can be derived from the "profile-level-id" MIME parameter signalled within the SDP "a=fmtp" attribute. H.264 receivers can request to receive only a lower bandwidth than depicted in this example via the SDP "b:AS" parameter.
Table E.7: QoS mapping for bi-directional video (H.264 AVC level 1.1, 192 kbps, IPv4, RTCP and MBR=GBR bearer)
|
Traffic class |
Conversational class |
Notes |
|
Delivery order |
No |
The application should handle packet reordering. |
|
Maximum SDU size (octets) |
1400 |
Maximum size of IP packets |
|
Delivery of erroneous SDUs |
No |
|
|
Residual BER |
10-5 |
Reflects the desire to have a medium level of protection to achieve an acceptable compromise between packet loss rate and speech transport delay and delay variation. |
|
SDU error ratio |
7*10-3 |
A packet loss rate of 0.7 % per wireless link is in general sufficient for video services |
|
Transfer delay (ms) |
170 ms |
Indicates maximum delay for 95th percentile of the distribution of delay for all delivered SDUs between the UE and the PS domain during the lifetime of a bearer service. Permits the derivation of the RAN part of the total transfer delay for the radio access bearer. This attribute allows RAN to set transport formats and H-ARQ/ARQ parameters such as the discard timer. |
|
Guaranteed bitrate for uplink (kbps) |
208 |
The total bit-rate of a video codec (running at 192 kbps) adding IP/UDP/RTP overhead (assumed to be 10 kbps) and RTCP (RS:0 and RR:5000 used in clause A.6 adds 2.5kbps) rounded up to nearest 8 kbps value. If downlink SDP contains a lower b:AS bandwidth modifier value, this should be used instead. |
|
Maximum bitrate for uplink (kbps) |
208 |
The same as the guaranteed bitrate. |
|
Guaranteed bitrate for downlink (kbps) |
208 |
The total bit-rate of a video codec (running at 192 kbps) adding IP/UDP/RTP overhead (assumed to be 10 kbps) and RTCP (RS:0 and RR:5000 used in clause A.6 adds 2.5kbps) rounded up to nearest 8 kbps value. If uplink SDP contains a lower b:AS bandwidth modifier value, this should be used instead. |
|
Maximum bitrate for downlink (kbps) |
208 |
The same as the guaranteed bitrate. |
|
Allocation/Retention priority |
subscribed value |
Indicates the relative importance to other radio access bearers. It should be the same or next lower value to the priority of a Conversational bearer with source statistics descriptor ‘speech’. |
|
Source statistics descriptor |
‘unknown’ |