Codec for Enhanced Voice Services (EVS); Interface to Iu, Uu, Nb and Mb
The Enhanced Voice Services (EVS) Codec is specified in Technical Specifications TS 26.441 [11], TS 26.442 [22], TS 26.443 [23], TS 26.444 [24], TS 26.445 [12], TS 26.446 [13], TS 26.447 [14], TS 26.448 [15], TS 26.449 [16], TS 26.450 [17], TS 26.451 [18] and TS 26.452 [25]. The generic frame format for 3G CS networks is specified in TS 26.453 [19]. The allowed EVS Configurations of the UMTS_EVS Codec Type are specified in TS 26.103 [20].
The present document specifies the mapping of the EVS generic frame format (3GPP TS 26.453 [19]) to the Iu Interface (3GPP TS 25.415 [4]) and the Uu Interface, including handling of the EVS-CMR by the UE and the Iu-terminating MGW.
The present document specifies also the mapping to the Nb Interface in a BICC-based circuit switched core network. (3GPP TS 29.415 [7]) and the Nb-Interface in a SIP-I-based circuit switched core network (3GPP TS 23.231 [3]).
The present document specifies also the interworking of different EVS Configurations on the terminations of the MGW and the interworking between EVS and AMR-WB on the terminations of the MGW.