Prashant Panigrahi

Rohde & Schwarz Tests VoLTE and Audio Quality

Rohde&Schwarz demonstrated voice over LTE (VoLTE) and audio quality measurements with the R&S®CMW500 wideband communication tester and the R&S®UPV audio analyzer at LTE North America 2011. For the demonstration a commercial LTE USB dongle in collaboration with an IMS client running on a PC was used to simulate a VoLTE-capable device. This setup registered to an IMS server via LTE (more ..)

Will Nokia's 2011 Results Bring Some Hope?

Nokia will publish its fourth quarter and 2011 years result on 26th January 2011. Since the last few years the largest Mobile Phone manufacturer in the world is struggling a lot due to strong competitions from smart phone manufacturers like Apple and Samsung.

Radio Link Control Protocol (RLC) is a layer 2 protocol in the UMTS system. This tutorial is an overview of RLC functionalities and architecture.

  • Radio Interface Architecture
  • RLC main functionalities
  • Data flow between layers
  • Model of RLC Sublayer
  • RLC Protocol Data Unit
  • RLC State Model
WCDMA Physical Layer: Principles and Features

Wideband Code Division Multiple Access (WCDMA) is the physical layer used for Universal Terrestrial Radio Access (UTRA) FDD mode. The WCDMA technology provides the UMTS system some of the new functionalities on the air interface.

This tutorial covers the following topics:

  • Spreading and Scrambling
  • Transport Channel Combining
  • Soft Handover
  • Compressed Mode
  • Power Control
UTRAN Interfaces and Protocols

UTRAN Interfaces are the most important point to start learning about the whole system. In this tutorial you can learn the following topics:

  • UMTS Interfaces
  • Protocols on different interfaces
  • Standard numbers and links to the different standards
3G Tutorials: Introduction to 3G

This tutorial contains some of the basics of 3G technology and network. The following topics are covered:

  • What is 3G?
  • 3G background.
  • UMTS requirements.
  • 3gpp specifications.
  • UMTS Architecture.