tfk technologies GmbH


tfk technologies GmbH
Baierbrunner Straße 33
81379 München
Tel: +49 89 189 43 54-405
Fax: +49 89 189 43 54-15
Description Date Location Time
NW1295 - VoLTE für Radio-Planer und Optimierer 22.07.2020 – 24.07.2020 München 09:00 – 16:00
NW1295 - VoLTE für Radio-Planer und Optimierer online (halbtägig) 25.01.2021 – 29.01.2021 Online Training 09:00 – 12:30
NW1295 - VoLTE für Radio-Planer und Optimierer online (halbtägig) 17.05.2021 – 21.05.2021 Online Training 09:00 – 12:30

VoLTE for Radio planning and optimization

Course description (english, PDF)

Duration: 3 days

With the first rollout of LTE the operators were focusing on higher data rates for non-real-time applications. At that stage voice services were still offered via the 2G/3G circuit domain. This situation is not satisfying for operators since they have to operate parallel networks for real-time and non-real-time services adding substantial cost.

For some time insufficient standardization did not offer a protection of infrastructure investment when operators were planning to integrate voice services into LTE networks. This situation has changed since the IP Multimedia Subsystem (IMS) and Single Radio Voice Call Continuity (SRVCC) seem to be the standard for the future. In between operators will also implement Circuit Switched Fallback (CSBF).

This training is designed for technical staff from Radio-planning and optimization who need to extend their knowledge regarding real-time services via LTE. Topics from the core network and the end-to-end view are included since they are essential to understand the consequences for the air interface. Nevertheless, the focus will be on the air interface.

Target group / Requirements

The target group is technical staff from Mobile Radio-planning and optimization. The participants get a comprehensive view of the challenges that come with the introduction of real-time services over LTE. This knowledge can be transferred to their work within the field of planning and optimization.

Course Content

Introduction: What are the problems with voice over LTE?

  • Legacy voice transmission in GSM and UMTS
  • Changes with Release 4
  • LTE: All IP Network
  • Real-time services: Quality of Service in LTE
  • Overview voice options in LTE

Intermediate solution: Circuit Switched Fall Back (CSFB)

  • Architecture and procedures: SGs Interface and attach
  • CSFB Mobile Originating and Mobile Terminating Call
  • eNodeB specification
  • CSFB  with PS HO
  • CSFB with Redirection
  • CSFB with Cell Change Order with/without NACC
  • Core Network specification
  • Trace Analysis
  • CSFB and Multi-RAB


  • CSFB extensions in Release 9
  • Including System Information
  • Idle Mode camping Mechanisms – RAT Camping Strategy
  • CSFB UE voice-centric und data-centric mode
  • CSFB extensions in Release 10
  • Dual Rx/Tx Support

Long term solution: VoLTE and IMS

  • VoLTE and VoIP
  • Overview Attach and Call Setup
  • IMS architecture and protocols
  • VoLTE Roaming
  • WLAN Interworking
  • Emergency Calls
  • VoLTE extensions: Vocoder Rate Adaption based on radio load/quality

Radio functions and eNodeB

  • Protocol structure and air interface
  • QoS and Scheduling on the air interface
  • SPS (Semi-Persistent Scheduling)
  • Frequency Selective Scheduling or Frequency Diversity
  • Assignment of Modulation and Coding Scheme
  • Capacity planning on the air interface: RB Usage
  • Kapazitätsplanung on eNodeB
  • Role of DRX
  • Further functions:  TTI Bundling
  • VoLTE and SRVCC
  • Overview
  • SRVCC towars UMTS and GSM
  • Multi-RAB
  • Extensions Release 10 and Release 11 – SRVCC 2G/3G to LTE/HSPA, Handover Performance Enhancements
  • Multimedia Broadcast Multicast Services (MBMS) in LTE
  • LTE Counters, KPIs, Features and Parameter


Certificates are given to all participants at the end of the course about the successful completion.

Course VoLTE for Radio planning and optimization
Number NW1295
Contact tfk technologies GmbH
Baierbrunner Straße 33
81379 München
Tel. +498918943540
Place München
Baierbrunner Straße 33
81379 München
Price € 1.830,00
VAT excl.

tfk technologies GmbH
Baierbrunner Straße 33
81379 München
Tel.: +49 89 189 43 54-0
Fax: +49 89 189 43 54-15 

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