Q.4 Detailed computation

26.1143GPPIP Multimedia Subsystem (IMS)Media handling and interactionMultimedia telephonyRelease 18TS

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

The tables below give a detailed description of the bandwidth computation. The b=AS bandwidth is not defined for SID.

NOTE 1: The tables below apply for both the header-full format and the compact format of EVS Primary mode, as switching between the modes can occur during the session.

For each codec mode, b=AS value of EVS AMR-WB IO mode is the same as the b=AS value of AMR-WB in octet-aligned mode. See clause K.4.

NOTE 2: The tables in clause K.4 also apply for the compact format of EVS AMR-WB IO mode, as switching between the modes can occur during the session.

NOTE 3: In tables Q.1 and Q.2, the speech frame of 7.2 kbps in EVS Primary mode at ptime=20 is zero-padded by one byte to avoid the protected payload size of 8.0 kbps, but zero-padding by additional byte(s) is also allowed.

Table Q.1: Computation of b=AS for EVS Primary mode (IPv4, ptime=20)

Mode	7.2	8	9.6	13.2	16.4	24.4	32	48	64	96	128	SID
Bits per speech frame	144	160	192	264	328	488	640	960	1280	1920	2560	48
Speech frame size (bytes)	19	20	24	33	41	61	80	120	160	240	320	6
CMR and ToC (bits)	16	16	16	16	16	16	16	16	16	16	16	16
RTP payload (bits)	168	176	208	280	344	504	656	976	1296	1936	2576	64
RTP header (bits)	96	96	96	96	96	96	96	96	96	96	96	96
UDP header (bits)	64	64	64	64	64	64	64	64	64	64	64	64
IPv4 header (bits)	160	160	160	160	160	160	160	160	160	160	160	160
Total bits per 20 ms	488	496	528	600	664	824	976	1296	1616	2256	2896	384
Total bit-rate (kbps)	24.4	24.8	26.4	30	33.2	41.2	48.8	64.8	80.8	112.8	144.8	19.2
AS (kbps)	25	25	27	30	34	42	49	65	81	113	145	N/A

Table Q.2: Computation of b=AS for EVS Primary mode (IPv6, ptime=20)

Mode	7.2	8	9.6	13.2	16.4	24.4	32	48	64	96	128	SID
Bits per speech frame	144	160	192	264	328	488	640	960	1280	1920	2560	48
Speech frame size (bytes)	19	20	24	33	41	61	80	120	160	240	320	6
CMR and ToC (bits)	16	16	16	16	16	16	16	16	16	16	16	16
RTP payload (bits)	168	176	208	280	344	504	656	976	1296	1936	2576	64
RTP header (bits)	96	96	96	96	96	96	96	96	96	96	96	96
UDP header (bits)	64	64	64	64	64	64	64	64	64	64	64	64
IPv6 header (bits)	320	320	320	320	320	320	320	320	320	320	320	320
Total bits per 20 ms	648	656	688	760	824	984	1136	1456	1776	2416	3056	544
Total bit-rate (kbps)	32.4	32.8	34.4	38	41.2	49.2	56.8	72.8	88.8	120.8	152.8	27.2
AS (kbps)	33	33	35	38	42	50	57	73	89	121	153	N/A

Table Q.3: Computation of b=AS for EVS Primary mode (IPv4, ptime=40)

Mode	7.2	8	9.6	13.2	16.4	24.4	32	48	64	96	128
Bits per speech frame	144	160	192	264	328	488	640	960	1280	1920	2560
Speech frame size (bytes)	18	20	24	33	41	61	80	120	160	240	320
CMR and ToC (bits)	24	24	24	24	24	24	24	24	24	24	24
RTP payload (bits)	312	344	408	552	680	1000	1304	1944	2584	3864	5144
RTP header (bits)	96	96	96	96	96	96	96	96	96	96	96
UDP header (bits)	64	64	64	64	64	64	64	64	64	64	64
IPv4 header (bits)	160	160	160	160	160	160	160	160	160	160	160
Total bits per 40 ms	632	664	728	872	1000	1320	1624	2264	2904	4184	5464
Total bit-rate (kbps)	15.8	16.6	18.2	21.8	25	33	40.6	56.6	72.6	104.6	136.6
AS (kbps)	16	17	19	22	25	33	41	57	73	105	137

Table Q.4: Computation of b=AS for EVS Primary mode (IPv6, ptime=40)

Mode	7.2	8	9.6	13.2	16.4	24.4	32	48	64	96	128
Bits per speech frame	144	160	192	264	328	488	640	960	1280	1920	2560
Speech frame size (bytes)	18	20	24	33	41	61	80	120	160	240	320
CMR and ToC (bits)	24	24	24	24	24	24	24	24	24	24	24
RTP payload (bits)	312	344	408	552	680	1000	1304	1944	2584	3864	5144
RTP header (bits)	96	96	96	96	96	96	96	96	96	96	96
UDP header (bits)	64	64	64	64	64	64	64	64	64	64	64
IPv6 header (bits)	320	320	320	320	320	320	320	320	320	320	320
Total bits per 40 ms	792	824	888	1032	1160	1480	1784	2424	3064	4344	5624
Total bit-rate (kbps)	19.8	20.6	22.2	25.8	29	37	44.6	60.6	76.6	108.6	140.6
AS (kbps)	20	21	23	26	29	37	45	61	77	109	141

Table Q.5: Computation of b=AS for EVS Primary mode (IPv4, ptime=20, dual-mono)

Mode	7.2	8	9.6	13.2	16.4	24.4	32	48	64	96	128
Bits per speech frame	144	160	192	264	328	488	640	960	1280	1920	2560
Speech frame size (bytes)	18	20	24	33	41	61	80	120	160	240	320
CMR and ToC (bits)	24	24	24	24	24	24	24	24	24	24	24
RTP payload (bits)	312	344	408	552	680	1000	1304	1944	2584	3864	5144
RTP header (bits)	96	96	96	96	96	96	96	96	96	96	96
UDP header (bits)	64	64	64	64	64	64	64	64	64	64	64
IPv4 header (bits)	160	160	160	160	160	160	160	160	160	160	160
Total bits per 20 ms	632	664	728	872	1000	1320	1624	2264	2904	4184	5464
Total bit-rate (kbps)	31.6	33.2	36.4	43.6	50	66	81.2	113.2	145.2	209.2	273.2
AS (kbps)	32	34	37	44	50	66	82	114	146	210	274

Table Q.6: Computation of b=AS for EVS Primary mode (IPv6, ptime=20, dual-mono)

Mode	7.2	8	9.6	13.2	16.4	24.4	32	48	64	96	128
Bits per speech frame	144	160	192	264	328	488	640	960	1280	1920	2560
Speech frame size (bytes)	18	20	24	33	41	61	80	120	160	240	320
CMR and ToC (bits)	24	24	24	24	24	24	24	24	24	24	24
RTP payload (bits)	312	344	408	552	680	1000	1304	1944	2584	3864	5144
RTP header (bits)	96	96	96	96	96	96	96	96	96	96	96
UDP header (bits)	64	64	64	64	64	64	64	64	64	64	64
IPv6 header (bits)	320	320	320	320	320	320	320	320	320	320	320
Total bits per 20 ms	792	824	888	1032	1160	1480	1784	2424	3064	4344	5624
Total bit-rate (kbps)	39.6	41.2	44.4	51.6	58	74	89.2	121.2	153.2	217.2	281.2
AS (kbps)	40	42	45	52	58	74	90	122	154	218	282

Annex R (informative):
IANA registration information for RTCP Feedback Message Types