Section: 5.15.2.3 Relaying
Content: The SGSN performs relaying between BSSGP messages, RANAP messages and GTP messages as described in TS 48.018[ None ]  [42], TS 25.413[ UTRAN Iu interface Radio Access Network Application Part (RANAP) signalling ]  [22], TS 29.060[ General Packet Radio Service (GPRS); GPRS Tunnelling Protocol (GTP) across the Gn and Gp interface ]  [14] and TS 29.274[ 3GPP Evolved Packet System (EPS); Evolved General Packet Radio Service (GPRS) Tunnelling Protocol for Control plane (GTPv2-C); Stage 3 ]  [43]. The MME performs relaying between S1 and S3/Gn messages as described in TS 36.413[ Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1 Application Protocol (S1AP) ]  [36] and TS 29.274[ 3GPP Evolved Packet System (EPS); Evolved General Packet Radio Service (GPRS) Tunnelling Protocol for Control plane (GTPv2-C); Stage 3 ]  [43] / TS 29.060[ General Packet Radio Service (GPRS); GPRS Tunnelling Protocol (GTP) across the Gn and Gp interface ]  [14].