GPRS for Mobile Internet
This book helps you understand how the GPRS system is used as a major technology building block for the emerging mobile Internet; the book
also provides you with detailed coverage of a wide range of important topics.
TABLE OF CONTENTS GPRS for Mobile Internet
5.2: Broadcast Information Management
5.2 Broadcast Information Management
In each cell, the BCCH and PBCCH, if present, continuously broadcast information on the serving cell and neighbor cells' configuration.
The serving cell and neighbor cell parameters are broadcast within messages called SI messages on BCCH and packet system information (PSI) messages on PBCCH. Based on this information the MS is able to decide whether and how it may gain access to the system via the cell it is camping on.
The first subsection describes how the network schedules the different SI and PSI messages on BCCH and PBCCH, respectively. The next subsection details the types of parameters that can be found by the mobile within the different instances of these messages. Among them, cell reselection and frequency parameters are broadcast. Some details on the acquisition of cell reselection parameters are given, since their monitoring is dependent on whether they are sent on BCCH or PBCCH.
During a TBF establishment, the mobile is allocated frequency channels. It derives its frequency allocation from frequency parameters that are broadcast by the network. The last subsection explains how this is performed.
5.2.1 SI Message Scheduling
All information broadcast on the BCCH or PBCCH is carried in SI messages or PSI messages, respectively. As there are several SI and PSI message types having a different content, it is useful for the MS to know where these types of messages are located in a group of multiframes. A variable TC was introduced in the GSM standard to facilitate the MS...
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