Browse Prior Art Database

AN OPTIMIZED PAGING PROCEDURE FOR GSM PACKET DATA

IP.com Disclosure Number: IPCOM000008817D
Original Publication Date: 1998-Sep-01
Included in the Prior Art Database: 2002-Jul-16
Document File: 2 page(s) / 108K

Publishing Venue

Motorola

Related People

Pierre DuPont: AUTHOR

Abstract

In the GSM General Packet Radio System (GPRS), a mobile station (MS) must be located at the cell level before a downlink data transmission can proceed (MS- terminated data transfer). During this location discov- ery process, the MS must identify itself to the network using a unique identity in order for the network to accurately transmit the data packet within the correct cell. This process requires the exchange of several sig- naling messages, which contribute to the packet trans- fer delay and consumes radio channel resources. GSM PAGING PROCEDURE In GPRS, the paging procedure requires at least 4 messages.

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MOZOROLA Technical Developments

AN OPTIMIZED PAGING PROCEDURE FOR GSM PACKET DATA

by Pierre DuPont

INTRODUCTION

   In the GSM General Packet Radio System (GPRS), a mobile station (MS) must be located at the cell level before a downlink data transmission can proceed (MS- terminated data transfer). During this location discov- ery process, the MS must identify itself to the network using a unique identity in order for the network to accurately transmit the data packet within the correct cell. This process requires the exchange of several sig- naling messages, which contribute to the packet trans- fer delay and consumes radio channel resources. GSM PAGING PROCEDURE

In GPRS, the paging procedure requires at least 4 messages.

1. An initial Paging Request message is transmitted over the Broadcast Control Channel (BCCH) within each cell of a group of cells known collec- tively as a "routing area." The message contains the unique ID of the MS being paged.

2. Upon receiving a Paging Request message con- taining its ID, the MS transmits a Channel Request to the Base Station over the Random Access Channel (RACH). This message contains a cause value of "paging response" and random

number selected by the MS.

3. The Base Station responds with an Immediate Assignment message including the random num- ber chosen by MS, and indicating an uplink channel allocation and timing information.

4. The MS can then transmit its identity to the net- work, indicating its current location and allowing the downlink data transfer to proceed.

Steps 2 and 3 are required in GSM because of the

limited amount of information that can be transmitted within a random access burst on the RACH. The ran- dom access burst itself is necessary to allow the Base Station to perform timing measurement and relay the timing advance information back to the MS.

IbG Bs

psgine m-1

1

chsnncl Request

Imnlcdiatc Assigumalt

2

3

I=!

Fig. 1 GSM Paging Procedure OPTIMIZED PAGING PROCEDURE

  This paper presents a method for optimizing the paging procedure for GSM GPRS and similar packet data systems. This technique can reduce the number of steps in the paging procedure, thereby reducing the overall packet transfer delay and radio resource requirements for MS-terminated packet data transfers.

Rather than the MS transmitting a random number

within the Channel...