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This tutorial section on UMTS basics covers following sub topics:
Main Page  Architecture  Stack  channel types  Bands  UARFCN  Frame  Timers 


Introduction

This tutorial on UMTS covers UMTS overview,UMTS Releases, UMTS frequency bands,UARFCN,UMTS multiple access,UMTS frame structure, UMTS network architecture, UMTS channel types(logical,transport,physical channels), mapping between channels,spreading,scrambling and modulation.

This tutorial covers following in addition to overview and UMTS releases outlined here:

UMTS Overview

UMTS stands for Universal Mobile Telecommunications System. It came into existence from GSM technology developed by 3GPP. UMTS network composed of three main parts UE (User Equipment), Radio Access Network (RAN) and Core Network. UMTS is released in several phases by 3GPP standard body as shown below. UMTS is also referred by 3G. The main features of 3G standardization by ITU includes support for circuit and packet switching, support for both voice and data applications, support for seamless mobility for both voice and data, improvement in spectral efficiency, legacy support for GSM/GPRS systems, increase in voice quality, low round trip packet delay and more.

UMTS Releases

Following table mentions UMTS releases with features.


Release Feature introduced
R99 WCDMA air interface introduced in UMTS
R4 IPMS (IP Multimedia Service) introduced on network side
R5 HSDPA
R6 HSUPA + Fractional DPCH
R7 HSPA, MIMO, higher modulation scheme 64QAM, continuous packet connectivity and Flexible RLC
R8 LTE, Dual cell HSDPA
R9 DC HSUPA
R10 LTE Advanced, Multi cell HSDPA
R11 8 carrier HSDPA

References

3GPP TS 25.201, Physical layer general description
3GPP TS 25.101, UARFCN

UMTS RELATED LINKS

UMTS Network Architecture
UMTS Protocol Stack
UMTS Logical, Transport and physical channels
UMTS Spreading,scrambling and modulation



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