UMTS World Logo

3G Devices
3G Jobs
Last Words
Contact Us

UMTSWorld box

Quality of Service

Network Services are considered end-to-end, this means from a Terminal Equipment (TE) to another TE. An End-to-End Service may have a certain Quality of Service (QoS) which is provided for the user of a network service. It is the user that decides whether he is satisfied with the provided QoS or not.

To realise a certain network QoS a Bearer Service with clearly defined characteristics and functionality is to be set up from the source to the destination of a service.

A bearer service includes all aspects to enable the provision of a contracted QoS. These aspects are among others the control signalling, user plane transport and QoS management functionality. A UMTS bearer service layered architecture is depicted below, each bearer service on a specific layer offers it's individual services using services provided by the layers below.


QoS Architecture

There are four different QoS classes:
  • conversational class
  • streaming class
  • interactive class
  • background class

    Traffic class

    Conversational class

    Real Time

    Streaming class

    Real Time

    Interactive class

    Best Effort

    Background class

    Best Effort

    Fundamental characteristics

    - Preserve time relation (variation) between information entities of the stream

    - Conversational pattern (stringent and low delay )

    - Preserve time relation (variation) between information entities of the stream

    - Request response pattern

    -Preserve payload content

    -Destination is not expecting the data within a certain time

    -Preserve payload content

    Example of the application


      streaming video

      web browsing

      telemetry, emails

    UMTS QoS classes

    List of UMTS Bearer Service Attributes:

  • Traffic class ('conversational', 'streaming', 'interactive', 'background')
  • Maximum bit rate (kbps)
  • Guaranteed bit rate (kbps)
  • Delivery order (y/n)
  • Maximum SDU size (octets)
  • SDU format information (bits)
  • SDU error ratio
  • Residual bit error ratio
  • Delivery of erroneous SDUs (y/n/-)
  • Transfer delay (ms)
  • Traffic handling priority
  • Allocation/Retention Priority
  • Source statistics descriptor ('speech'/'unknown')

    SDU = Service Data Unit

    Further reading: 3GPP 23.107

      UMTS Overview UMTS Network UMTS Frequencies UMTS Coding UMTS Link Budget
    UMTS Security UMTS Codes Synchronisation Co-location
    3G Data Speeds UTRA Time Slots UTRA Channels WCDMA Spreading
    UMTS QoS Channel Coding Media Formats Compressed Mode
    UMTS HSDPA UMTS Handovers Location Services UMTS Power Control
    UMTS Overview Cell Search Random Access RCC States Iui Frame Structure
    CDMA Overview Call Setup UTRAN Interfaces Paging Virtual Home Environment

  • | Advertise | Support Us | Contribute | Site Map | Legal | Privacy | About | Notes|
    Copyright © 1999 - 2003