LTE协议基础知识汇总

框图

IRAT交互

LTE实体

Entity Name	Description
AAA	Authentication, Authorization and Accounting server
AF	Application Function
CBC	Cell Broadcast Center
eAN/ePCF	Evolved AN/Packet Control Function
EIR	Equipment Identity Register
eNB	eNodeB
ePDG	Evolved/Enhanced Packet Data Gateway
GGSN	Gateway GPRS Support Node
HSGW	HRPD Serving Gateway
HSS	Home Subscriber Server
MME	Mobility Management Entity
MSC	Mobile Switching Center
OCS	Online Charging System
PDN	Packet Data Network
PCRF	Policy and Charging Rules Function
P-GW	Packet Data Network (PDN) Gateway
SGSN	Serving GPRS Support Node
S-GW	Serving Gateway
UE	User Equipment
VLR	Visitor Location Register

LTE协议

Name	3GPP / ITU Standard	Interfaces	Description
Diameter	RFC 3588, 29.272,29.273, 29.212, 29.214,29.215, 32.299	S6a, S6d, S13, S13,’ SWa/d/m/x, STa, S6b,H2, Pi, Gx, Gxa, Gxc, Gy Rx, S9	Authentication, Authorization and Accounting Protocol
GTPv1	29.281	S1-U, X2-U, S4-U, S5/8-U, S12-U	GPRS Tunneling Protocol User Plane Protocol
GTPv2	29.274	S3-C, S4-C, S5/8-C, S10, S11	GPRS Tunneling Protocol for ControlPlane
MIPv4	29.279	S2a-C	Mobile IPv4 Protocol
NAS	24.301	LTE-Uu, S1-MME	Non-Access-Stratum Protocol
PDCP	36.323	LTE-Uu	Packet Data Convergence Protocol
PMIPv6	29.275	S2a-C, S2b-C, S5/8-C	Proxy Mobile IPv6 Protocol
RLC	36.322	LTE-Uu	Radio Link Control Protocol
RRC	36.331	LTE-Uu, S1, X2, S3	Radio Resource Control Protocol
S1AP	36.413	S1-C	E-UTRAN S1 Application Protocol (S1AP)
SCTP	RFC 2960	S1-MME, X2, SBc,Diameter-basedinterfaces	Stream Control Transport Protocol
X2AP	36.423	X2-C	E-UTRAN X2 Application Protocol

LTE接口

Interface	Description
Cx	CSCF HSS
Gxa/S7	PCRF P-GW
Gxc	PCRF S-GW
Gy	P-GW OCS
LTE-Uu	UE eNB
Rx+	PCRF AF
SBc	MME CBC
SGi	P-GW PDN
SGs	MME VLR
S1-MME	eNB MME
S1-U	eNB S-GW
S2a	P-GW HSGW [trusted non-3GPP IP access]
S2b	P-GW ePDG
S2c	P-GW UE [untrusted non-3GPP and/or 3GPP access]
S3	SGSN MME
S4	SGSN S-GW
S5	S-GW P-GW
S6a	MME HSS
S7/Gxa	P-GW PCRF
S8	Visited S-GW Home P-GW
S9	Visited PCRF Home PCRF
S10	MME MME
S11	MME S-GW
S13	MME EIR
S13’	SGSN EIR
S101	MME eAN/PCF
S102	MME MSC [1xRTT ]
S103	S-GW HSGW
Sv	MME MSC [ WCDMA]
SWa	AAA Proxy untrusted non-3GPP access
SWd	AAA Server AAA Proxy
SWm	ePDG AAA Proxy
SWx	HSS AAA
X2	eNB eNB

IMS实体

Entity Name	Description
BGCF	Breakout Gateway Control Function
HSS	Home Subscriber Service
I-CSCF	Interrogating Call Session Control Function
IM-MGW	IP Multimedia Media Gateway
MGCF	Media Gateway Control Function
MRF	Media Resource Function
P-CSCF	Proxy Call Session Control Function
S-CSCF	Serving Call Session Control Function

IMS接口

Interface	Description
Cx	I-CSCF, S-CSCF HSS
ISC	S-CSCF AS
Ma	I-CSCF AS
Mg	MGCF I-CSCF
Mi	S-CSCF BGCF
Mj	BGCF MGCF
Mn	MGCF IM-MGW
Mr	S-CSCF MRFC
Mw	P-CSCF I-CSCF S-CSCF
Rf/Ro	CSCF BGCF MRFC MGCF AS
Sh	AS HSS

典型的LTE信令过程

插入UML图

UE eNodeB New MME Old MME/SGSN HSS EIR SGW PGW PCRF Attach Procedure Attach Request Attach Request Identication Request Identication Response Identity Request Identity Response kc, Rand, Res Authentication/Security Request Authentication/Security Response Identity Request Identity Response ME Identity Check Ciphered Options Request Ciphered Options Response Update Location Request Cancel Location Cancel Location Ack Update Location Ack Create Session Request Create Session Request PCEF Initiate IP-CAN Session Termination Create Session Response First Downlink Data Create Session Response Initial Context Setup Req./Attach Accept RRC Connection Reconfig RRC Connection Reconfig. Complete Initial Context Setup Resp. Direct Transfer Attach Complete Dedicated Bearer Activation Procedure IP-CAN Session Modification Create Bearer Request Create Bearer Request Bearer Setup Req. Session Management Req. RRC Connection Reconfig RRC Connection Reconfig. Complete Bearer Setup Response Direct Transfer Session Management Response Create Bearer Response Create Bearer Response IP-CAN Session Modification UE eNodeB New MME Old MME/SGSN HSS EIR SGW PGW PCRF