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Prepared by Abdulrahman Fady
 L3 Messages is the messages transferred
between MS and Network (BSC or MSC ) to
control the MS behavior in idle mode and in
dedicated mode as well as tell MS when to do
Location update
 L3 Messages are UL and DL and conveyed on
Control channels
◦ BCCH
◦ PCH
◦ SDCCH
◦ SACCH
◦ FACCH
 What are system Information Messages
◦ Downlink messages
◦ sent on BCCH channel or SACCH channel
◦ Used to inform MS by all the needed information to
enable it to do its operations in normal way
◦ SI messages transmitted periodically from BTS and MS
reads them every 30 sec for serving cell and every 5
minutes for six strongest cells
◦ There are a lot of SI types e.g. SI type 1, SI type 2
 Direction : DL
 Channel : BCCH
 Contents
◦ BCCH Frequency
◦ Available frequencies
◦ RACH Control
parameters as MAXRET
◦ Cell Barring
◦ Emergency
 Direction : DL
 Channel : BCCH
 Contents
◦ BCCH frequency
◦ MAXRET
◦ Call re-establishment
control
◦ NCC permitted range
◦ Cell Barring
 Direction : DL
 Channel : BCCH
 Contents
 PLMN ID (MCC & MNC)
 Cell ID
 LAC
 MFRMS
 AGBLK
 Mapping Method
 ATT
 T3212
 RL_timeout
 Selection Parameters
 ACCMIN
 MAX-TX-PWR-UL
 CRH
 Cell reselection
 CRO
 PT
 TO
 Half rate support
 SI scheduling
 Direction : DL
 Channel : BCCH
 Contents
 PLMN ID (MCC & MNC)
 Cell ID
 LAC
 Cell Selection Parameters
 Cell Reselection Parameters
 Direction : DL
 Channel : BCCH
 Contents
 Other Band BA list
 Direction : DL
 Channel : BCCH
 Contents
 Same Band BA list
 Direction : DL
 Channel : BCCH
 Contents
 GPRS Information
 EGPRS Supported
 Power control
 Network Mode
 Direction : DL
 Channel : SACCH
 Contents
 GPRS Information
 Cell ID
 LAC
 PLMN ID
 RL timeout
 DTX info
 Band
 Direction : DL
 Channel : SACCH
 Contents
 BA list
 Direction : DL
 Channel : SACCH
 Contents
 Part from Active BA
list
 Direction : DL
 Channel : SACCH
 Contents
 Part from Active BA
list
 Multi band reporting
 Immediate Assignment
◦ SDCCH assignment during Call Setup
 Measurement Report
◦ MS should report 6 strongest neighbors cells to BSC
 Handover Command
◦ BSC instruct the MS to do HO to certain Cell
 Handover Access
◦ MS starts HO process
 Handover Complete
◦ Message sent after HO completed Successfully
 Direction : DL
 Channel : AGCH
 Contents
 Inform MS about
SDCCH that will be
used in call Setup
 Direction : UL
 Channel : SACCH
 Contents
 Six strongest
neighbors
 Direction : DL
 Channel : SACCH
 Contents
 Instruct the MS to
handover to a certain
cell by sending its
information
 BCCH
 BSIC
 MAIO /HSN
 Direction : UL
 Channel : FACCH
 Contents
 MS tries to access
the new cell using
this message
 Direction : UL
 Channel : FACCH
 Contents
 MS inform the
network that the HO
has been completed
successfully

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Layer 3 messages (2G)

  • 2.  L3 Messages is the messages transferred between MS and Network (BSC or MSC ) to control the MS behavior in idle mode and in dedicated mode as well as tell MS when to do Location update  L3 Messages are UL and DL and conveyed on Control channels ◦ BCCH ◦ PCH ◦ SDCCH ◦ SACCH ◦ FACCH
  • 3.
  • 4.  What are system Information Messages ◦ Downlink messages ◦ sent on BCCH channel or SACCH channel ◦ Used to inform MS by all the needed information to enable it to do its operations in normal way ◦ SI messages transmitted periodically from BTS and MS reads them every 30 sec for serving cell and every 5 minutes for six strongest cells ◦ There are a lot of SI types e.g. SI type 1, SI type 2
  • 5.  Direction : DL  Channel : BCCH  Contents ◦ BCCH Frequency ◦ Available frequencies ◦ RACH Control parameters as MAXRET ◦ Cell Barring ◦ Emergency
  • 6.  Direction : DL  Channel : BCCH  Contents ◦ BCCH frequency ◦ MAXRET ◦ Call re-establishment control ◦ NCC permitted range ◦ Cell Barring
  • 7.  Direction : DL  Channel : BCCH  Contents  PLMN ID (MCC & MNC)  Cell ID  LAC  MFRMS  AGBLK  Mapping Method  ATT  T3212  RL_timeout  Selection Parameters  ACCMIN  MAX-TX-PWR-UL  CRH  Cell reselection  CRO  PT  TO  Half rate support  SI scheduling
  • 8.
  • 9.  Direction : DL  Channel : BCCH  Contents  PLMN ID (MCC & MNC)  Cell ID  LAC  Cell Selection Parameters  Cell Reselection Parameters
  • 10.  Direction : DL  Channel : BCCH  Contents  Other Band BA list
  • 11.  Direction : DL  Channel : BCCH  Contents  Same Band BA list
  • 12.  Direction : DL  Channel : BCCH  Contents  GPRS Information  EGPRS Supported  Power control  Network Mode
  • 13.  Direction : DL  Channel : SACCH  Contents  GPRS Information  Cell ID  LAC  PLMN ID  RL timeout  DTX info  Band
  • 14.  Direction : DL  Channel : SACCH  Contents  BA list
  • 15.  Direction : DL  Channel : SACCH  Contents  Part from Active BA list
  • 16.  Direction : DL  Channel : SACCH  Contents  Part from Active BA list  Multi band reporting
  • 17.  Immediate Assignment ◦ SDCCH assignment during Call Setup  Measurement Report ◦ MS should report 6 strongest neighbors cells to BSC  Handover Command ◦ BSC instruct the MS to do HO to certain Cell  Handover Access ◦ MS starts HO process  Handover Complete ◦ Message sent after HO completed Successfully
  • 18.  Direction : DL  Channel : AGCH  Contents  Inform MS about SDCCH that will be used in call Setup
  • 19.  Direction : UL  Channel : SACCH  Contents  Six strongest neighbors
  • 20.  Direction : DL  Channel : SACCH  Contents  Instruct the MS to handover to a certain cell by sending its information  BCCH  BSIC  MAIO /HSN
  • 21.  Direction : UL  Channel : FACCH  Contents  MS tries to access the new cell using this message
  • 22.  Direction : UL  Channel : FACCH  Contents  MS inform the network that the HO has been completed successfully