UMTS Air Interface (2 days or 12 hours)
The UMTS air interface provides a spectrally efficient radio carrier capable of supporting multi kilobit packet channels between the mobile and UTRAN. This course examines the protocols and procedures employed across the air interface as well as the architecture of the physical frame, transport and logical channels. In addition, complexities such as Radio Resource Control, Power Control and Interworking will also be explained. The UMTS System Engineering Course is considered to be an ideal primer for the UMTS Air Interface course, ensuring attendees will gain maximum benefit in the time available.
Who Should Attend
Technical Staff requiring detailed knowledge of UMTS Air Interface operation. Engineers and Designers requiring a comprehensive understanding of the UMTS Air Interface.
Pre - Learning
Pre-Learning is provided to prime those attending the instructor led phase. Each lesson is based on an interactive online format and should take about 30 minutes to complete. The pre-Learning lessons are:
- Test of Understanding - Try the online check to see how much you know.
- UMTS Architecture.
- W-CDMA Principals.
- UMTS UE and Air Interface.
Course Outline
Divided into 8 sections, the topics covered will include:
Section 1: Air Interface Structure and Channels (1.5hours)
- UMTS Air Interface Architecture - NAS, AS.
- Channel Types.
- Radio Channels.
- Logical Channels - Control and Traffic - BCCH, PCCH, CCCH, DCCH, CTCH, DTCH.
- Transport - Common and Dedicated - RACH, BCH, PCH, FACH, DCH.
- Physical Channels.
- Channel Mapping.
Section 2: Physical Interface (1.5 hours)
- Spread Spectrum - Channel Requirements, Channel Rates, Spreading, DSSS, Despreading.
- UMTS Codes - PSCH, SSCH.
- Scrambling Codes - scrambling code groups, STSR, Channel Information.
- Spreading Codes - Code Allocation.
- Basic DSS System.
- Rake Receiver.
- Uplink and Downlink Code Processing.
- Timing - Frame, Node B, Cell, UE.
Section 3: Physical Channels (1.5 hours)
- Uplink and Downlink Physical Channels.
- CPICH Measurements.
- Downlink Format - P-SCH, S-SCH, CPICH, P-CCPCH, S-CCPCH, PICH, AICH, DPCH, DPCCH etc.
- Uplink Format - PRACH, DPCH, etc.
- Transmission Gap Position.
- Compressed Mode.
Section 4: Radio Resource Control (1.5 hours)
- RRC Functions.
- RRC Architecture - GC, Nt, DC.
- RRC Procedures - General, Connection Management, Bearer Control, mobility.
- Idle Mode Procedures - System Information, Paging.
- Connected Mode - Identities.
- RRC Connection.
- Radio Bearer Procedures.
- Where appropriate, network traces and associated exercises will feature throughout the section to enhance understanding.
Section 5:UMTS Operational Procedures (2 hours)
- PLMN Selection.
- Cell Selection Procedures.
- System Information.
- UMTS Mobility, Cell Reselection.
- Measurement Reporting.
- Handover Procedures - soft, softer, hard, inter-frequency handover triggers, planning handovers.
- Common Channel Procedures.
- Where appropriate, network traces and associated exercises will feature throughout the section to enhance understanding.
Section 6: Power Control (1 hour)
- Closed Loop Power Control - Uplink, Uplink Single Channels, Uplink Multiple Channels.
- Diversity.
- Transmit Diversity.
- Space Time Diversity.
- Smart Antennas - advantages and disadvantages.
Section 7: Idle Mode Interworking (1.5 hours)
- 2G/3G Coverage Areas.
- Idle Mode and Idle Mode Reselection.
- UMTS to GSM Cell Reselection.
- GSM and GPRS to UMTS Cell Reselection.
- Mobility Procedures and Interworking Issues.
- Where appropriate, network traces and associated exercises will feature throughout the section to enhance understanding.
Section 8: Connected Mode Interworking (1.5 hours)
- 3G/2G State Model.
- Mobility in Different UE States.
- Modes for RRC Connection.
- Circuit Switched Connected Mode Interworking Procedures.
- Packet Switched Connected Mode Interworking Procedures.
- Where appropriate, network traces and associated exercises will feature throughout the section to enhance understanding.
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