A.2 (HS)CSD Framing over RTP

3GPP44.318Generic Access Network (GAN)Mobile GAN interface layer 3 specificationRelease 17TS

For radio interface rate of 3.6 kbps, the Terminal Adaptation Function (TAF) in the MS produces a 72-bit frame every 20 ms. For transmission in RTP [35], this 72-bit frame is packed into a 9 octet payload. The format of this 72-bit frame is defined in [13].

For radio interface rate of 6 kbps, the Terminal Adaptation Function (TAF) in the MS produces a 120-bit frame every 20 ms. For transmission in RTP [35], this 120-bit frame is packed into a 15 octet payload. The format of this 120-bit frame is defined in [13].

For radio interface rate of 12 kbps, the Terminal Adaptation Function (TAF) in the MS produces a 240-bit frame every 20 ms. For transmission in RTP [35], this 240-bit frame is packed into a 30 octet payload. The format of this 240-bit frame is defined in [13].

For radio interface rate of 14.5 kbps, the Terminal Adaptation Function (TAF) in the MS produces a 290-bit frame every 20 ms. For transmission in RTP [35], this 290-bit frame is packed into a 37 octet payload beginning with a 6-bit signature (binary 001100),. The format of this 290-bit frame is defined in [13].

For radio interface rate of 29 kbps, the Terminal Adaptation Function (TAF) in the MS produces a 580-bit frame every 20 ms. For transmission in RTP [35], this 580-bit frame is packed into a 73 octet payload beginning with a 4-bit signature (binary 1100),. The format of this 580-bit frame is defined in [13].

For radio interface rate of 43.5 kbps, the Terminal Adaptation Function (TAF) in the MS produces a 870-bit frame every 20 ms. For transmission in RTP [35], this 870-bit frame is packed into a 109 octet payload beginning with a 2-bit signature (binary 01),. The format of this 870-bit frame is defined in [13].

Radio interface rate of 32kbps is FFS.

The IETF has defined RFC 4040 ("RTP Payload Format for a 64 kbit/s Transparent Call") [51]. This RFC shall be used for the 64 kbps circuit switched bearer required (for example) for a CS video call supported in GAN mode.

Annex B (normative):
Network QoS