UMTS Radio Interface

Overview:

The UMTS Radio Interface course is focusing onthe physical layer of the UMTS radio access as defined in the release 5, 6 and 7 of 3GPP Standards. From Release 5 onwards, High Speed Downlink Packet access has been an inseparable part of UMTS air interface. The course tries to build up the concepts of UMTS WCDMA based air interface and later introduces the changes that occurred with HSDPA (release 5), HSUPA (release 6) and Evolved HSPA (release 7).

It provides an understanding of the WCDMA access method and how the generation and allocation of codes are handled in UMTS. Further, the different types of channels used in the UMTS radio access are discussed as well as the physical channels.The various physical layer procedures such as cell search, random access, packet access, dedicated channels establishment and power control are described.

Release 7 focuses on the improvement of HSPA standard towards higher data rates, lower delays and lower consumption of UE battery power. These features are discussed in the eHSPA section of the Course.

Pre-requisites:

General UMTS System knowledge is required. For background knowledge, the Apis course UMTS System Overview is recommended. Any previous knowledge of HSPA Principles is helpful but not mandatory.

Course contents:

Introduction

• UMTS System introduction

• 3GPP Releases and their main features

Air Interface

• Scrambling and Channelization codes

• Codes usage in UL

• Codes Usage in DL

• I/Q- and time multiplexing

• Complex spreading

Channels in UMTS

• Logical, Transport and Physical Channels

• Dedicated, Common & Shared Transport Channels

• Mapping of TraCH to PhyCh

• Physical Channels

• HSPA channels

Physical Layer Procedures

• Cell Search

• Random Access

• Paging with discontinuous reception

Handover and measurements

• Events 1A, 1B, 1C

• Intra-freq. Hard Handover

• Active Set Update

• Compressed Mode

• Measurement reporting and Handover Signalling

Power Control

• Uplink Power Control

• Downlink Power Control

Multiplexing and Channel Coding

• processing chain with CRC detection, convolutional coding, turbo coding, interleaving, radio frame and slot segmentation

High Speed Packet Access

• Principles of HSPA

• Comparison of DCH, HS-DSCH and E-DCH

• UE categories

Evolved High Speed Packet Access (eHSPA or HSPA+)

• Downlink MIMO (Multiple Input Multiple Output)

• Higher order modulation for uplink (16QAM) and downlink (64QAM),

• Improved layer 2 support for high data rates

• Enhanced CELL_FACH state

• Continuous packet Connectivity

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