9.19 Short Message Service

3GPP43.318Generic Access Network (GAN)Release 16Stage 2TS

GAN provides support for SMS via the CS domain and the PS domain. GAN-attached and GPRS enabled mobile stations will be able to send and receive SMS messages via the CS domain or the PS domain, regardless of the GPRS class (B or C) with the restriction that the class C mobiles can support only SMS via the PS domain.

9.19.1 SMS via the CS domain

Support for SMS via the CS domain in GAN is based on the same mechanism that is utilized for GSM mobility management and call control. On the MS side, the SMS layers (including the supporting CM sub layer functions) utilize the services of the MM layer to transfer SMS messages per standard circuit switched GSM implementation. The SM-CP protocol is effectively tunnelled between the MS and the CN, using GA-RRC messages from the MS to the GANC, where the GANC relays the SM-CP to RANAP messages for transport over the Iu-cs interface.

As with GSM mobility management and call control procedures, the secure IPsec tunnel and TCP session are used to provide secure and reliable SMS delivery over the IP network.

9.19.2 SMS via the PS domain

Support for SMS via the PS domain is based on the same mechanism as the transfer of the GPRS MM/SM signalling messages. The SM-CP protocol is effectively tunnelled between the MS and the CN, using GA-RRC messages from the MS to the GANC, where the GANC relays the SM-CP to RANAP messages for transport over the Iu-ps interface.

As with GPRS signalling, the secure IPsec tunnel and TCP session is used to provide secure and reliable GPRS SMS delivery over the IP network.