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Introduction

Historical Background

GSM

EDGE

  The Evolution of the GSM Network

High Speed Circuit Switched Data (HSCSD)

General Packet Radio Service (GPRS)

System Overview

Traffic Cases

- IMSI attach

- GPRS Attach

 -Combined GPRS/IMSI Attach

- PDP Context Activation and Deactivation

GPRS Air Interface

Logical Channels

PDCH Allocation

Dedicated PDCH

On-demand PDCH

Master PDCH

Cell Selection and Reselection

GPRS Support Node (GSN)

Interconnection Principles

GPRS IP Connectivity

The users IP communication

EDGE Summary and Key Points

WCDMA

UMTS

The Future

Final Thoughts

Blueadmiral.com

On Demand Dedicated PDCH

On-demand PDCH can be pre-empted by incoming circuit switched calls in congested cells, it should be noted that in a HSCSD, a user can never get more than a single channel through the pre-emption procedure.
There is no physical limit on how many on-demand PDCHs there can be in a cell. However the number of on-demand PDCHs depends on how much packet switched traffic there is, upto the limit where circuit switched traffic starts

 

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