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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

Logical Channels

Within GPRS there are a number of new logical channels, similar to the existing ones, but these are only for GPRS. (NB These logical channels have been standardized.) The new logical channels have been mapped onto the physical channels that have been assigned for packet data, the physical channels denoted as Packet Data Channels (PDCH), the logical channels that are mapped onto these are :

  • Packet Common Control Channels

  • PRACH : Packet Random Access Channel (Uplink)

  • PPCH : Packet Paging Channel (Downlink)

  • PAGCH : Packet Access Grant Channel (Downlink)

  • PTCCH : Packet Timing advance Control Channel (Up/downlink)

  • PNCH : Packet Notification Channel (Downlink)
    Broadcast Channel

  • PBCCH : Packet Broadcast Control Channel (Downlink)
    Packet Traffic Channels

  • PDTCH : Packet Data Traffic Channel (Up/downlink)

  • PACCH : Packet Associated Control Channel (Up/downlink)

 

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