Sh Gy. Ro Gx. Cx Ici. Mr Mj
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1 Sh Ro Cx Ici SIP UT IMS Sv LTE Mr Mj Mi Mg ISC Mw
2 LTE / VoLTE IMS Protocols Interfaces LTE Protocol Stack IMS Protocol Stack LTE (4G) IMS PSTN / LTE Ex : S1, S5, SGi LTE Control Plane Ex : S1, S10, S11, IMS Ex : Gm, SIP, Izi UDP, TCP, SCTP IMS Control Plane Ex : Sh, Ro, Cx,, Sv, ISC, Mw, Mg, Mi RTP Diameter SIP / SDP IP Layer MAC / Data Link Layer Physical / Ethernet
3 SCTP Vs UDP SCTP ( Stream Control Transmission Protocol ) Requires Strong / Robust Media connectivity Provides Super Reliable Communication Connection-oriented protocol similar to TCP Provides facilities such as multi-streaming and multi-homing Better performance and redundancy S1AP, X2AP, Diameter (,, ) Best Suited for Control Plane & Close Reliable such as Billing, Charging & Authentications UDP ( User Datagram Protocol ) Suited for Non-Reliable Media Does not guarantee that Data in the order on receive Minimal message-oriented transport layer protocol Enables two hosts to connect and send short messages to one another : S1U, GTPv1U ( S5, S8 ) Control Plane : GTPv2C ( S5, S8 ) Best Suited for Long Distance & Open s such as Roaming etc..
4 LTE / IMS Protocols Interfaces LTE (4G) IMS PSTN / BICC ISUP SIP-I LTE User Plane LTE Control Plane IMS User Plane IMS Control Plane S1U S5/S8 SGi GTPv1U, S1AP, SGi S1 S5/S8 S10 S11 a X2 SGs GTPv2C, Diameter, AP (X2AP, SGSAP, S1AP ) Gm SIP Izi RTP, RTCP Sh Ro Cx Sv ISC Mw Mg Mi Mj Mr / Mr UT Ici SIP & SDP, HTTP, Diameter, Megaco
5 LTE VoLTE IMS Connectivity Overview DIAMETER WORLD SIP WORLD IMS
6 SIP & Diameter Protocols SIP ( Session Initiated Protocol ) Diameter Used for Controlling / Multimedia Calls & Uses RTP / RTCP for media plane SIP manages set-up/establishing, tying together, and tear-down/ terminating of multimedia communications 5 Functions of SIP :- a) User Location b) User Availability c) User Capabilities d) Session Setup e) Session Management Evolution of RADIUS (AAA) Protocol - Authentication, authorization, and accounting (AAA) services Reliable & Secure ( Runs on TCP / SCTP ) Supports Failover mechanism to maintain redundancy Support for Proxy & Relay Agents Support for Capability Negotiation via Mandatory / Optional AVPs Provides Dynamic discovery of Peers
7 LTE Protocols & Links LTE User Plane S1U S5/S8 SGi LTE Control Plane S1 S5/S8 S10 S11 a X2 SGs IMS LTE is only control Plane SGW / PGW is handling Media Internet
8 a LTE Protocols & Links DIAMETER Interface ( to ) Diameter Link connects to Used for :- Authentication of User Download User Profile ( APN Allowed.. ) IMS Internet, SCTP SGs-AP, Control Plane, SCTP GTP, Control Plane, UDP
9 & LTE Protocols & Links & Links : Diameter Link connects PGW to Used for QOS, Traffic Prioritization : Diameter Link connects PGW to Used for Balance Reservation, Internet Quota Allocation & Management, Wallet for Services IMS, SCTP SGs-AP, Control Plane, SCTP GTP, Control Plane, UDP DIAMETER Internet
10 GTP Interfaces LTE Protocols & Links GTP Interfaces GTP Interfaces S10, S11, S5/S8 GPRS Tunneling protocol is an important IP/UDP based protocol used in GSM, UMTS and LTE core S10 S10 : to S11 : to S5 : to ( Local ) S8 : to ( Roaming ) S11 S5 S8 IMS, SCTP SGs-AP, Control Plane, SCTP GTP, Control Plane, UDP Internet
11 S1 / S1U LTE Protocols & Links S10 S1 Interface The S1 interface in LTE is used between EnodeBs and the EPC S1- : EnodeB to ( Control Plane ) S1U : EnodeB to ( ) S1U S11 S5 S8 IMS, SCTP SGs-AP, Control Plane, SCTP GTP, Control Plane, UDP Internet
12 SGi Link LTE Protocols & Links S10 SGi Interface SGi link is IP / TCP Interface Used as Exit path for Traffic from LTE s to :- Internet IMS S1U S11 S5 S8 SGi IMS Internet, SCTP SGs-AP, Control Plane, SCTP GTP, Control Plane, UDP
13 SGs Link LTE Protocols & Links S10 SGs MSC SGs Interface Runs on SGsAP Protocol over SCTP Connect : to MSC Used for CS Fall of calls where VoLTE is Not Available. Also used for SMS & USSD S1U S11 S5 S8 SGi IMS, SCTP SGs-AP, Control Plane, SCTP GTP, Control Plane, UDP Internet
14 Complete LTE Protocols & Links S10 SGs MSC S1U S11 S5 S8 SGi IMS, SCTP SGs-AP, Control Plane, SCTP GTP, Control Plane, UDP Internet
15 VoLTE IMS Connectivity Overview Gm IMS
16 VoLTE IMS Connectivity Overview TAS MMTEL I/S-CSCF SBC P-CSCF / ATCF / ATGW IBCF/ TrGW MRF BGCF MGCF / IM- Ici / Izi IMS User Plane Gm SIP Izi BICC/ ISUP / SIP-I Other IMS IMS Control Plane Sh Ro Cx Sv ISC Mw Mg Mi Mj Mr / Mr UT Ici
17 DIAMETER 3GPP TS TAS MMTEL I/S-CSCF SBC P-CSCF / ATCF / ATGW IBCF/ TrGW MRF BGCF MGCF / IM- Ici / Izi Creation of an appropriate policy for a session for Incoming or Outgoing Calls on via to P-CSCF BICC/ ISUP / SIP-I Other IMS
18 Cx DIAMETER 3GPP TS , Cx TAS MMTEL I/S-CSCF SBC P-CSCF / ATCF / ATGW IBCF/ TrGW MRF BGCF MGCF / IM- Ici / Izi I/S-CSCF communicates with to get user profile, Supports in user registration & Authentication BICC/ ISUP / SIP-I Other IMS Cx I/S-CSCF to
19 Sh DIAMETER 3GPP TS , Sh Cx TAS MMTEL MRF TAS download user profile from and enables service for user TAS to Sh I/S-CSCF SBC P-CSCF / ATCF / ATGW IBCF/ TrGW BGCF MGCF / IM- Ici / Izi BICC/ ISUP / SIP-I Other IMS
20 Ro DIAMETER Ro Sh Ro Cx TAS MMTEL I/S-CSCF SBC P-CSCF / ATCF / ATGW IBCF/ TrGW MRF BGCF MGCF / IM- Ici / Izi TAS communicates with & Prepaid Platform for Online charging of Calls BICC/ ISUP / SIP-I Other IMS TAS to
21 Gm SIP / SDP Gm Sh Gm Ro Cx TAS MMTEL I/S-CSCF SBC P-CSCF / ATCF / ATGW IBCF/ TrGW MRF BGCF MGCF / IM- Ici / Izi Enables connectivity between the UE and the IMS network for registration, authentication, encryption, and session control UE to P-CSCF BICC/ ISUP / SIP-I Other IMS
22 Mw SIP / SDP Mw Sh Gm Ro Cx TAS MMTEL I/S-CSCF Mw SBC P-CSCF / ATCF / ATGW IBCF/ TrGW MRF BGCF MGCF / IM- Ici / Izi Used to exchange messages between CSCFs ( Ex : P-CSCF to S-CSCF ) P-CSCF to I/S-CSCF x-cscf to x-cscf BICC/ ISUP / SIP-I Other IMS
23 Mx SIP / SDP Mx Sh Gm Ro Cx TAS MMTEL I/S-CSCF Mw Mx SBC P-CSCF / ATCF / ATGW IBCF/ TrGW MRF BGCF MGCF / IM- Used for the interworking with another IMS network, This is used by CSCF to send SIP message from BGCF to the IBCF in the other network Ici / Izi I/S-CSCF to IBCF BICC/ ISUP / SIP-I Other IMS
24 Mg SIP / SDP Mg Sh Ro Cx TAS MMTEL MRF Enables Interworking with Circuit Switched to the CSCF I/S-CSCF to MGCF Gm I/S-CSCF Mw Mx SBC P-CSCF / ATCF / ATGW IBCF/ TrGW Mg BGCF MGCF / IM- Ici / Izi BICC/ ISUP / SIP-I Other IMS
25 Mi SIP / SDP Mi Sh Gm Ro Cx TAS MMTEL I/S-CSCF Mw Mx SBC P-CSCF / ATCF / ATGW IBCF/ TrGW Mi Mg MRF BGCF MGCF / IM- Serving CSCF to forward the SIP/SDP messages to the Breakout Gateway Control Function for the purpose of MGCF selection for interworking with Circuit Switched networks Ici / Izi I/SCSCF to BGCF BICC/ ISUP / SIP-I Other IMS
26 Mj SIP / SDP Mj Sh Gm Ro Cx TAS MMTEL I/S-CSCF SBC P-CSCF / ATCF / ATGW IBCF/ TrGW Mi Mw Mx Mg MRF BGCF Mj MGCF / IM- Allows the Breakout Gateway Control Function to exchange SIP/SDP messages with the MGCF for the purpose of interworking with Circuit Switched networks Ici / Izi BGCF to MGCF BICC/ ISUP / SIP-I Other IMS
27 ISC SIP / SDP ISC Sh Gm Ro Cx TAS MMTEL ISC I/S-CSCF SBC P-CSCF / ATCF / ATGW IBCF/ TrGW Mi Mw Mx Mg MRF BGCF Mj MGCF / IM- Ici / Izi SCSCF Interact with the MMTel supplementary services implemented on the TAS S-CSCF to TAS BICC/ ISUP / SIP-I Other IMS
28 Mr & Mr SIP / SDP Mr Mr Sh Gm Ro Cx TAS MMTEL ISC I/S-CSCF SBC P-CSCF / ATCF / ATGW IBCF/ TrGW Mr Mr Mi Mw Mx Mg MRF BGCF Mj MGCF / IM- Allow interaction with the media resource (MRF) for specific supplementary services (e.g. conference call) Ici / Izi Mr : SCSCF MRF Mr' : TAS MRF BICC/ ISUP / SIP-I Other IMS
29 Ut XCAP Ut 3GPP TS Sh Ro TAS MMTEL Mr MRF Ut Allows user configuration of the supplementary services specified for VoLTE service to Handset Directly Gm Cx I/S-CSCF Mw ISC Mx SBC P-CSCF / ATCF / ATGW IBCF/ TrGW Mr Mi Mg BGCF Mj MGCF / IM- Ici / Izi BICC/ ISUP / SIP-I Other IMS UE TAS
30 Sv GTPv2 Sv MSC Sh Ro Cx TAS MMTEL ISC Mr Mr MRF Sv is a new special SV interface is introduced to support SRVCC functionality to MSC Sv Gm I/S-CSCF Mw Mx SBC P-CSCF / ATCF / ATGW IBCF/ TrGW Mi Mg BGCF Mj MGCF / IM- Ici / Izi BICC/ ISUP / SIP-I Other IMS
31 LTE / VoLTE IMS S10 Sh Ro TAS MMTEL ISC Mr Mr MRF MSC Sv SGs S1U S11 S5 S8 SGi Gm Cx I/S-CSCF Mw Mx SBC P-CSCF / ATCF / ATGW IBCF/ TrGW Mi Mg BGCF Mj MGCF / IM- IMS Core To Other IMS s Ici/Izi To CS / PSTN s BICC/ ISUP/SIP-I
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