UMTS Architecture

Interfaces

Interfaces	Description
B	MSC – VLR
C	MSC – HLR
D	VLR – HLR
E	MSC – GMSC
F	MSC – EIR
G	VLR – VLR
Gc	GGSN – HLR
Gd	SGSN – SMSC
Gf	SGSN – EIR
Gn	SGSN – GGSN
Gr	SGSN – HLR
Gs	SGSN – VLR
H	HLR – AuC
IuPS	RNC – SGSN
IuCS	RNC – MSC/VLR
Iub	NodeB – RNC
Iur	RNC – RNC
Uu	UE – NodeB

Important Interfaces and Protocols

Uu Interface

Protocols

Protocol	Description	Standard
MM	Mobility Management	3GPP TS 24.008
CC	Call Control	3GPP TS 24.008
SMS	Short Message Service	3GPP TS 23.040, 3GPP TS 24.011
SS	Supplementary Service	3GPP TS 24.080
GMM	GPRS Mobility Management	3GPP TS 24.008
SM	Session Management	3GPP TS 24.008
GSMS	GPRS Short Message Service	3GPP TS 23.040, 24.011
AMR	Adaptive Multi Rate	3GPP TS 26.071
IP	Internet Protocol	IETF RFC 791
PPP	Point-to-Point Protocol	IETF RFC 1661
RRC	Radio Resource Protocol	3GPP TS 25.331
PDCP	Packet Data Convergence Protocol	3GPP TS 25.323
RLC	Radio Link Control	3GPP TS 25.322
MAC	Medium Access Control	3GPP TS 25.321

Iub Interface

Protocols

Protocol	Description	Standard
NBAP	NodeB Application Part	3GPP TS 25.433
BMC	Broadcast Multicast Control	3GPP TS 25.324
TAF	Terminal Adaptation Function	3GPP TS 27.001, 27.002
RLP	Radio Link Protocol	3GPP TS 24.022
SSCF-UNI	Service Specific Co-ordination Function – User Network Interface	ITU-T Q.2130
SSCOP	Service Specific Connection Oriented Protocol	ITU-T Q.2110
ALCAP	Access Link Control Application Part	ITU-T Q.2630.1, Q.2630.2
STC	Signalling Transport Converter	ITU-T Q.2150.1
AAL2	ATM Adaptation Layer 2	ITU-T I.363.2
AAL5	ATM Adaptation Layer 5	ITU-T I.363.5
ATM	Asynchronous Transmission Mode

NOTE: Other protocols are defined above

Iur Interface

Protocols

Protocol	Description	Standard
RNSAP	Radio Access Network Application Part	3GPP TS 25.413
MTP3-B	Message Transfer Part Level 3 for ATM	ITU-T Q.2110
SSCF-NNI	Service Specific Co-ordination Function – Network Node Interface	ITU-T Q.2140
M3UA	MTP3 User Adaptation Layer	IETF RFC 3332
SCTP	Stream Control Transmission Protocol	IETF RFC 2960

NOTE: Other protocols are defined above

IuCS Interface

Protocols

Protocol	Description	Standard
AAL2-SAR SSCS	Segmentation and Reassembly Service Specific Convergence Sublayer for the AAL type 2	ITU-T I.366.1

NOTE: Other protocols are defined above

IuPS Interface

Protocols

Protocol	Description	Standard
UDP	User Datagram Protocol	IETF RFC 768
GTP-U	GTP User Plane	ETSI GSM 09.60 / 3GPP TS 29.060

NOTE: Other protocols are defined above