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Packet Switched data call in GSM Uplink (PS call flow)


This tutorial section on GSM basics covers following sub topics:
Main Page  Frame  Burst types  PHY  gsm stack  speech processing  ARFCN  Channel types  GSM Security  Network Entry  Mobile basics 


Introduction

This article covers Packet Swiched data, PS call flow between Mobile(UE) and network for uplink(to upload data). It covers messages exchanged for GPRS attach and PDP context activation procedures between mobile and SGSN/VLR/HLR/GGSN. It include channels(PPCH,PRACH,AGCH,PDCH) used at layer 1 to carry various messages over the air. This article assumes that initial frequency and time synchronization is done between UE and Network as described in GSM tutorial in tutorial section.

GSM uplink packet switched,PS call flow

Here RACH is sent by mobile(UE) mobile to network(BTS) and network will assign slot(single/multiple) for packet transfer. GPRS attach procedures are completed by mobile station for location update and to complete security check. To establish internet connectivity IP address need to be assigned to the Mobile and connectivity with APN need to be established. This is done using PDP context activation procedures.

As described in GSM protocol stack, messages flow between both mobile and network at various layers(layer 3,layer 2,layer 1(physical layer). The message flow is self explanatory to establish the Packet switched uplink data call in GSM.

PS call flow in the downlink

PS call flow for gsm mobile in the downlink, refer Downlink PS data call

RELATED LINKS

GSM RF planning  mobile originated call GSM  Mobile Terminated Call  GSM Tutorial   GSM protocol stack   GSM physical layer   GPRS protocol stack   GPRS tutorial   CS vs PS 

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