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This tutorial section on WCDMA (UMTS) basics covers following sub topics:
UMTS Tutorial  UMTS channels  measurements  PHY layer  TDD vs FDD PHY  RRC States  Security  Cell search  Bands  UARFCN  Frame 

This page describes CD/CAICH or collision detection with channel assignment indicator channel with respect to WCDMA/UMTS system.

The Collision Detection Channel Assignment Indicator channel (CD/CA-ICH) is a physical channel used to carry CD Indicator (CDI) only if the CA is not active, or CD Indicator/CA Indicator (CDI/CAI) at the same time if the CA is active.



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

RF and Wireless Terminologies