On-Site Telecommunications Courses
 

Objectives : Present detailed LTE/ePC procedures related to registration, session and service control in IMS/VoLTE; these procedures are associated with DIAMETER Cx and Sh interfaces

Attendance : Telecommunication Engineers, Network Architects, Telecommunication Consultants

Pre-requisites : Minimum knowledge on 4G and TCP/IP protocols

Duration : 3

DIAMETER and its Applications in LTE/ePC/IMS

DIAMETER is an AAA (Authentication, Authorization, Accounting) protocol. It enables service providers to authenticate users, to authorize their access to services and to collect information on resource usage. DIAMETER is the protocol used by 3GPP for its LTE/ePC (Long Term Evolution of 3G/ Evolved Packet Core) and IMS (IP Multimedia Subsystem) architectures. It enables the authentication, the authorization and the charging (online and offline charging) of LTE and IMS users. The goal of this course is to present the DIAMETER base protocol (DIAMETER nodes, DIAMETER messages, DIAMETER transport and routing capabilities, DIAMETER security) and the DIAMETER applications/interfaces related to LTE and IMS, particularly those related to HSS, namely S6a, S6d, SWx, CX, Sh and those related to Policy and Charging Control (PCC), namely, Gx, Gy, Gz, etc.

1. DIAMETER base protocol

  • 1.1. DIAMETER versus RADIUS
  • 1.2. Types of DIAMETER Nodes
    • 1.2.1. Client
    • 1.2.2. Server
    • 1.2.3. Relay agent
    • 1.2.4. Proxy agent
    • 1.2.5. Redirect agent
    • 1.2.6. Translation agent
  • 1.3. DIAMETER messages and parameters
    • 1.3.1. DIAMETER message format
    • 1.3.2. DIAMETER Command codes (Message Type)
    • 1.3.3. AVP format (Attribute-Value Pair)
  • 1.4. DIAMETER Transport and Routing
    • 1.4.1. DIAMETER Transport Concepts
    • 1.4.2. DIAMETER Routing Concepts : Routing Tables (Peer table and Realm-based routing table) and Routing function
  • 1.5. DIAMETER base protocol
  • 1.6. DIAMETER capability negotiation
  • 1.7. DIAMETER security requirements

2. EPS (LTE + EPC) Architecture

  • 2.1. LTE and EPC entities
    • 2.1.1. ENodeB / Security Gateway
    • 2.1.2. MME/Serving GW/PDN GW
    • 2.1.3. PCC entities
    • 2.1.4. HSS and EIR
    • 2.1.5. Telephony services with CS Fallback or VoLTE (IMS)
  • 2.2. LTE and EPC interfaces
  • 2.3. 3GPP and non-3GPP accesses to EPC
  • 2.4. DIAMETER based signaling architecture
  • 2.5. Roaming with DIAMETER International Broker/Hub
  • 2.6. Attachment to EPS and bearer establishment

3. DIAMETER applications in LTE

  • 3.1. Mobility Management
    • 3.1.1. S6a/S6d : Interface between the MME/S4-SGSN and HSS to enable the transfer of subscriber related data
    • 3.1.2. SWx : interface between the 3GPP AAA Server and HSS to enable the transfer of subscriber related data
    • 3.1.3. S13/S13' : Interface between MME/S4-SGSN and HSS to enable ME Identity check
  • 3.2. Policy and Charging Control
    • 3.2.1. Gx : Interface between the GGSN (PCEF) and PCRF and between PDN GW (PCEF) and the PCRF to obtain charging rules in the context of PCC (Policy and Charging Control)
    • 3.2.2. S9 : Interface between visited and home PCRFs
    • 3.2.3. Gy : online charging Interface in 3G/LTE between PCEF and OCS
    • 3.2.4. Gz : offline charging interface in 3G/LTE between PCEF and OFCS
    • 3.2.5. Sy : interface between OCS and PCRF for QoS and gating control based on spending limits
    • 3.2.6. Rx : Interface between AF (e.g. P-CSCF) and PCRF for (QoS) policy control

4. Access to ePC and HSS interfaces

  • 4.1. LTE acccess to ePC
    • 4.1.1. S6a interface between MME and HSS
  • 4.2. 2G/3G Access to ePC
    • 4.2.1. S6d interface between S4-SGSN and HSS
  • 4.3. non-3GPP access to ePC
    • 4.3.1. SWx interface between 3GPP AAA Server and HSS

5. Description of the commands of S6a/S6d Interface and their AVPs

  • 5.1. Update-Location-Request(ULR)
  • 5.2. Update-Location-Answer(ULA)
  • 5.3. Cancel-Location-Request(CLR)
  • 5.4. Cancel-Location-Answer(CLA)
  • 5.5. Authentication-Information-Request(AIR)
  • 5.6. Authentication-Information-Answer(AIA)
  • 5.7. Insert-Subscriber-Data-Request(IDR)
  • 5.8. Insert-Subscriber-Data-Answer(IDA)
  • 5.9. Delete-Subscriber-Data-Request(DSR)
  • 5.10. Delete-Subscriber-Data-Answer(DSA
  • 5.11. Purge-UE-Request(PUR)
  • 5.12. Purge-UE-Answer(PUA)
  • 5.13. Reset-Request(RSR)
  • 5.14. Reset-Answer(RSA)
  • 5.15. Notify-Request(NOR)
  • 5.16. Notify-Answer(NOA)
  • 5.17. Traces
  • 5.18. Scenarios
    • 5.18.1. User attachment to EPC from LTE
    • 5.18.2. User attachment to EPC from GERAN/UTRAN
    • 5.18.3. Inter-MME mobility management
    • 5.18.4. LTE to 3G mobility management

6. Description of the commands of PCC interfaces and their AVPs

  • 6.1. Gx interface
    • 6.1.1. CCR/CCA; RAR/RAA
    • 6.1.2. Trace
  • 6.2. S9 interface
    • 6.2.1. CCR/CCA; RAR/RAA
  • 6.3. Gy interface
    • 6.3.1. CCR/CCA; RAR/RAA
  • 6.4. Gz interface
    • 6.4.1. ACR/ACA
  • 6.5. Rx interface
    • 6.5.1. AAR/AAA; RAR/RAA; STR/STA; ASR/ASA
  • 6.6. Sy interface
    • 6.6.1. SLR/SLA; SNR/SNA; STR/STA
  • 6.7. PCC scénarios
    • 6.7.1. Faire use
    • 6.7.2. Anti-bill shock
    • 6.7.3. Freemium
    • 6.7.4. Parental control
    • 6.7.5. Speed boost (turbo button)
    • 6.7.6. Bonus/promo
    • 6.7.7. Traffic redirection based on user location.

7. DIAMETER application in IMS

  • 7.1. IMS Architecture
  • 7.2. User profile in the HSS
  • 7.3. IMS user identities
  • 7.4. IMS Interfaces towards HSS
    • 7.4.1. Cx/Dx Interface
    • 7.4.2. Sh/Dh Interface
  • 7.5. IMS Procedures with emphasis on Cx message flows
    • 7.5.1. Cx interface and AVPs
      • 7.5.1.1. UAR/UAA
      • 7.5.1.2. SAR/SAA
      • 7.5.1.3. MAR/MAA
      • 7.5.1.4. PPR/PPA
      • 7.5.1.5. LIR/LIA
      • 7.5.1.6. RTR/RTA
    • 7.5.2. IMS Registration and Cx
    • 7.5.3. IMS Session Establishment/Release and Cx
    • 7.5.4. IMS profile update and Cx
    • 7.5.5. IMS deregistration and Cx
  • 7.6. IMS procedures with emphasis on Sh interface
    • 7.6.1. Service data in HSS
    • 7.6.2. Sh interface : Request/Answers and AVPs
      • 7.6.2.1. UDR/UDA
      • 7.6.2.2. PUR/PUA
      • 7.6.2.3. SNR/SNA
      • 7.6.2.4. PNR/PNA


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