E.5 Bi-directional speech (AMR-WB23.85, IPv4, RTCP and MBR=GBR bearer)
26.1143GPPIP Multimedia Subsystem (IMS)Media handling and interactionMultimedia telephonyRelease 18TS
The bitrate for AMR-WB 23.85 including IP overhead (one AMR-WB frame per RTP packet, using bandwidth efficient mode) is 40.4 kbps which is rounded up to 41 kbps.
Table E.6: QoS mapping for bi-directional speech (AMR-WB 23.85, 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 speech services |
|
Transfer delay (ms) |
130 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) |
44 |
The total bit-rate of AMR-WB23.85 including IP/UDP/RTP overhead and 5 % for RTCP. |
|
Maximum bitrate for uplink (kbps) |
44 |
The same as the guaranteed bitrate. |
|
Guaranteed bitrate for downlink (kbps) |
44 |
The total bit-rate of AMR-WB23.85 including IP/UDP/RTP overhead and 5 % for RTCP. |
|
Maximum bitrate for downlink (kbps) |
44 |
The same as the guaranteed bitrate. |
|
Allocation/Retention priority |
subscribed value |
Indicates the relative importance to other radio access bearers. It should be the next lower value to the priority of the signalling bearer. |
|
Source statistics descriptor |
‘speech’ |