E.30 Bi-directional video (H.265 (HEVC) Main profile, Main tier, level 3.1, 750/40 kbps, IPv6, RTCP and MBR>GBR bearer)
26.1143GPPIP Multimedia Subsystem (IMS)Media handling and interactionMultimedia telephonyRelease 18TS
The video bandwidths used for defining MBR and GBR are assumed to be 750 kbps and 40 kbps, respectively. The IPv6 overhead is 48 kbps (assuming 25 fps and 4 IP packets per frame) for MBR and 2.4 kbps (assuming QCIF, 5 fps and 1 IP packets per frame) for GBR, resulting in 800 kbps and 45 kbps, respectively. Adding 5% for RTCP increases the bandwidth by 40 kbps for both MBR and GBR. However, the RTCP bandwidth is limited to max 14 kbps, see clause 7.3.1. Rounding up to the nearest higher integer multiple of 8 kbps gives 816 kbps and 72 kbps, respectively.
Table E.31: QoS mapping for bi-directional video (H.265 (HEVC) level 3.1, 750/40 kbps, IPv6, 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) |
64 |
The total bit-rate of a video codec (running at 40 kbps) adding IP/UDP/RTP overhead (assumed to be 2.4 kbps) and RTCP (adds 5 % of the session bandwidth) 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) |
816 |
The total bit-rate of a video codec (running at 750 kbps) adding IP/UDP/RTP overhead (assumed to be 48 kbps) and RTCP (adds 5 % of the session bandwidth) rounded up to nearest 8 kbps value. If downlink SDP contains a lower b=AS bandwidth modifier value, this should be used instead. |
|
Guaranteed bitrate for downlink (kbps) |
64 |
The total bit-rate of a video codec (running at 40 kbps) adding IP/UDP/RTP overhead (assumed to be 2.4 kbps) and RTCP (adds 5 % of the session bandwidth) 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 downlink (kbps) |
816 |
The total bit-rate of a video codec (running at 750 kbps) adding IP/UDP/RTP overhead (assumed to be 48 kbps) and RTCP (adds 5 % of the session bandwidth) rounded up to nearest 8 kbps value. If downlink SDP contains a lower b=AS bandwidth modifier value, this should be used instead. |
|
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’ |