Description

This seminar presents VoIP over LTE for which IMS is mandatory. You will develop your knowledge of the characteristics of 4G and IMS networks, the concepts for establishing VoLTE service with the maintenance of telephone communication during a handover to 2G/3G networks and taxation mechanisms.

Who is this training for ?

For whom ?

This seminar is aimed at project managers and managers who work in the VoLTE environment and who wish to acquire the basic concepts.

Prerequisites

Training objectives

Study the evolution of mobile networks Understand the solutions proposed in the LTE standard to offer multimedia services (voice, presence, etc.)

Understand the operation of the IMS network and SIP signaling for the deployment of VoLTE Differentiate between VoLTE services from OTT solutions Analyze the concepts of taxation

Training program

• 2G and 3G cellular networks
  • Presentation of the 2G network architecture.
  • GSM: separation of the radio core and the network core.
  • Description of the evolution from GSM to GPRS.
  • Evolution of the network with the arrival of 3G: study of the UTRAN radio core.
  • Evolution of the network core: from R.
  • 99 towards NGN .
  • The entities of the 2G and 3G network.
  • Role and functionality.
  • Radio resource management procedure.
  • Services voice and data transmission of 2G and 3G networks.
  • The circuit and packet switched network.
  • Study of a call: Mobile Originating Call and Mobile Terminating Call.
  • Attachment to the Data network.
  • Notions of PDP Context.
• The LTE network
  • EPS network architecture: LTE - SAE.
  • Description of entities: eNB, MME, SGW, PGW, PCRF, HSS.
  • X2, S1 network interfaces -U, S1-MME, S5/S8, S6, S11, Gx.
  • Signaling in the control plane and the user plane.
  • Protocols: RRC, S1-AP ,
  • Description of the physical layer: Modulation, Multiplexing, PRB.
  • Notion of bearer, QoS parameters.
  • Default bearer, dedicated bearer.
  • The PCC: QoS and taxation.
• SIP: presentation and architecture
  • Principles and definition.
  • SIP architecture and description of functional entities: Proxy.
  • Registrar.
  • Redirection - Location.
  • SIP protocol: signaling and voice flow mechanisms.
  • SIP messages: description of requests and responses.
  • RTP protocol: voice transport.
  • Presentation of codecs: impact on the MoS.
  • SIP addressing mechanisms (URI, IP, E164).
  • Methods.
  • Method details: INFO, OPTION, MESSAGE.
  • SIP and mobiles.
  • GSM, GPRS.
  • 3GPP.
  • Example of SIP communication: study of call FLows (recording, call.).
• L'architecture IMS
  • Presentation of the IMS.
  • The protocols used.
  • IMS server (IP Multimedia Subsystem): P-CSCF, I-CSCF, S-CSCF.
  • HSS, PCRF, MGCF, MGW/SGW equipment.
  • AAA in IMS: study of the Diameter protocol.
  • Client authentication.
  • Billing architecture (Online and Offline).
  • Signaling in the IMS: the SIP/SDP protocol.
  • Registration and service management procedures : Call Flow study.
  • IMS services and application servers
• Radio functionality for voice
  • Voice Bearer Management: QoS, QCI, ARP, GBR, non-GBR.
  • Admission policy.
  • Preemption of eNb.
  • Scheduling strategy: dynamic, semi-persistent.
  • DRX mode VAD (Voice Activity Detection) options and comfort noise generation.
  • TTI Bundling features.
  • Compression of IP headers: RoHC, principles and performances.
  • Management of Handovers.
  • Practical study: limitation of the number of simultaneous calls according to the number of PRBs.
• Voice over 4G solutions
  • CSFB technological solutions.
  • MSC / MME interconnection.
  • Registration on the circuit-switched network and on the IMS network: concept of double attachment.
  • VLR bypass: TAI/LAI.
  • SG and SV interface.
  • SR-VCC (Single Radio Voice Call Continuity) function.
  • SRVCC: session transfer in the core network and call transfer on the radio layer.
  • Reception/Sending an SMS on the 4G network.
  • Roaming and interconnection.
  • Taxation and QoS.
• Voice over LTE
  • Attachment procedure.
  • Creation of the Default bearer.
  • Registration procedure to the IMS network: study of SIP signaling and 4G SIG.
  • Private/Public IMS addressing.
  • Negotiation of codecs and availability of radio resources.
  • Setting up a SIP call/session: creation of the dedicated bearer.
  • Telephone services provided by the IMS server.
  • Call flow on user registration.
  • Interconnection between the LTE network/ EPC and IMS? role of P-CSCF.
  • Study of SIP requests: NOTIFY/SUBSCRIBE.
  • RCS and OTT services: Joyn, Skype.
  • SRVCC function: impact on registration and session establishment, PS-CS handover, session maintenance.
  • ATCF/ATGW entity and SCC AS server.
  • Evolution of the LTE and IMS architecture: e-SRVCC, v-SRVCC, r-SRVCC.
  • Case study Call FLow: SMSoSG and Mobile Originated Call (MOC), Mobile Terminate Call (MTC) and roaming.
• Voice over WiFI: WiFi Calling
  • Call over WiFI.
  • Extension from LTE network to WiFI: ePDG gateway, T-ADS (Terminating Access Domain Selection).
  • Authentication over WiFI network .
  • Call continuity.
  • Handover.
  • Evolution of Vi-WiFI.