Contents1. Paging Messages1Paging Type 11.2 TMSI Combination2.1 TMSI & 1 IMSI Combination3.2 IMSI Combination2Paging Type 21.2 TMSI & 1 IMSI Combination2.3 TMSI Combination3Paging Type 32. System Info Messages1IDLE MODE Informations1.System Info 12.System Info 23.System Info 34.System Info 45.System Info 132DEDICATED MODE Information1.System Info 52.System Info 63. Call Processing Messages1MS Originated Call2MS Terminated Call3Location Updating ProcedureOther L3 MessagesCreated by Jayadevan.N1Channel Request for LUjayadevan.nirmalan@adacellworks.com2Location Update Requestwww.adacellworks.com3Location Update Accept4Immediate Assignment Extended5Disconnect due to No Circuits6Disconnect Normal Cause7Release8Release Complete9Channel Release10Sync Channel Information11Measurement Report12Classmark Enquiry13Classmark Change14Channel Request for Call Re-establishment15Immediate Assignment for Call Re-establishment16CM Re-establishment Request17CM Service Reject18CM Service Accept19Cell Broadcast Page20Channel Mode Modify21Channel Mode Modify Acknowledge

* Links are provided for every messages. To view the detailed L3 Messages click the messages.Note: This is just a tutorial material for Layer 3 messaging and call flow. These contains messages which we encounter in normal RF scenarios, All the messages specified in GSM TS 4.08 is not covered. All the messages are taken from TEMS 4.1.1 version.Paging Type 3Paging Type 23 TMSI Combination2 TMSI & 1 IMSI Combination2 IMSI Combination1 TMSI & 1 IMSI Combination2 TMSI CombinationPaging Type 1System Info 5System Info 6System Info 4System Info 3System Info 2System Info 1System Info 13www.adacellworks.comjayadevan.nirmalan@adacellworks.comMS Originated CallLocation Updating ProcedureChannel Request for LULocation Update RequestLocation Update AcceptImmediate Assignment ExtendedDisconnect due to No CircuitsDisconnect Normal CauseReleaseRelease CompleteChannel ReleaseSync Channel InformationMeasurement ReportClassmark EnquiryClassmark ChangeChannel Request for Call Re-establishmentImmediate Assignment for Call Re-establishmentCM Re-establishment RequestCM Service RejectImmediate Assignment ExtendedCM Service AcceptCM Service AcceptMS Terminated CallCell Broadcast PageChannel Mode ModifyChannel Mode Modify Acknowledge

Call Processing SummaryNote: In this presentation the BTS & BSC is considered together as BSS part.MOBILE ORIGINATED CALLMSBSSMSC/VLRHLRPSTNClick to return to main pageChannel RequestImmediate AssignmentCM Sevice RequestComplete Layer 3 InfoAuthentication RequestAuthentication ResponseCipher Mode CMDCiphering Mode CommandCipher Mode CompleteCipher Mode CompleteSetupIdentity RequestIdentity ResponseCall ProceedingAssignment RequestAssignment CommandAssignment CompleteAssignment CompleteInitial Address Message (IAM)Address Complete Message (ACM)AlertingAnswer Signal/Answer Message (ANM)ConnectConnect AcknowledgeMOBILE TERMINATED CALLMSBSSMSC/VLRHLRPSTNClick to return to main pageSend Routing InfoProvide Roaming NumberRoaming NumberRouting InformationInitial Address Message (IAM)Paging CommandPagingChannel RequestImmediate AssignmentPaging ResponseComplete Layer 3 InfoCipher Mode CMDCiphering Mode CommandCiphering Mode CompleteCipher Mode CompleteIdentity RequestIdentity ResponseSetupCall ConfirmedAssignment RequestAssignment CommandAssignment CompleteAssignment CompleteAlertingAddress Complete Message (ACM)ConnectConnect AcknowledgeAnswer Signal/Answer Message (ANM)LOCATION AREA UPDATINGMSBSSMSC/VLRHLRold VLRClick to return to main pageChannel RequestImmediate AssignmentLocation Update RequestComplete Layer 3 InfoSend Authentication paraAuthentication ParaAuthentication RequestAuthentication ResponseUpdate LocationInsert Subsciber dataSub data insertion accLocation Update AcceptCancel LocationTMSI Realloc CommandLoc cancell acceptTMSI Realloc CompleteLocation Update Accept

Channel RequestImmediate AssignmentCM Sevice RequestAuthentication RequestAuthentication ResponseCiphering Mode CommandCipher Mode CompleteSetupIdentity RequestIdentity ResponseCall ProceedingAssignment CommandAssignment CompleteAlertingConnectConnect AcknowledgeClick to return to main pageClick to return to main pagePagingChannel RequestImmediate AssignmentPaging ResponseCiphering Mode CommandCiphering Mode CompleteIdentity RequestIdentity ResponseSetupCall ConfirmedAssignment CommandAssignment CompleteAlertingConnectConnect AcknowledgeClick to return to main pageChannel RequestImmediate AssignmentLocation Update RequestAuthentication RequestAuthentication ResponseTMSI Realloc CommandTMSI Realloc CompleteLocation Update Accept

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Paging messagesPaging Message Type 1 (2 TMSI Combination)Click to return to main pageBrief Idea: Generally 3 types of Paging messages.1. Paging Message Type 1Contains Paging for Max 2 mobiles, with IMSI or TMSI2. Paging Message Type 2Contains Paging message for 3 mobiles. 1 IMSI and the other 2 or 1 TMSI3. Paging Message Type 3Contains only 4 TMSI's.Paging Message Type 1 (1 TMSI & 1 IMSI Combination)Click to return to main pagePaging Message Type 1 (2 IMSI Combination)Click to return to main pagePaging Message Type 2 (2 TMSI & 1 IMSI Combination)Click to return to main pagePaging Message Type 2 (3 TMSI Combination)Click to return to main pagePaging Message Type 3 ( Will contain only 4 TMSI)Click to return to main page

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Sys Info messagesSystem Info 1 ( Idle Mode)Click to return to main pageNote:This message normally for the Cell channel Informations. This will give the no of frequencies allocated for the particular cell. In hopping case this will indicate the frequencies in the MAL list along with the BCCH frequency. In non hopping case will indicate the TCH & BCCH frequencies.System Info 2 ( Idle Mode)Click to return to main pageNote:This message gives the information about the neighbor frequencies in the idle mode. Will only gives the BCCH of the neighbors defined. And the NCC permitted parameter allows the mobile to restrict the neighbors to be sent in the measurement report.System Info 3 ( Idle Mode)Click to return to main pageSystem Info 4 ( Idle Mode)Click to return to main pageNote:This message gives the information about the CBCH for the mobile to decode the CBCH. Along with the other cell level details like LAC, RACH control parameters etc..System Info 5 ( Dedicated Mode)Click to return to main pageNote:This message gives the information about the neighbor frequencies in the dedicated mode. Will only gives the BCCH of the neighbors defined.System Info 6 ( Dedicated Mode)Click to return to main pageSystem Info 13 ( Idle Mode, GPRS Information)Click to return to main page

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Call Processing- MS Originated1. Channel Requestgo back2. Immediate Assignmentgo backPoint 1Once the Mobile sends the RACH it tries to decode all the AGCH information and waits for the Immediate assignment targeted to the particular mobile. It is being identified from the Establishment cause and Random reference.3. CM Service Requestgo back4.Authentication Requestgo back5. Authentication Responsego back6. Ciphering Mode Commandgo back7. Ciphering Mode Completego back8. Setupgo backPoint 2:In this message only the mobile forward the called number to the system.9. Identity Requestgo back10. Identity Responsego back11. Call Proceedinggo back12. Assignment Commandgo back13. Assignment Completego back14. Alertinggo back15. Connectgo back16. Connect Acknowledgego back

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Call Processing- MS Terminated1. Paging to the MSgo back2. Channel Requestgo back3. Immediate Assignmentgo back4. Paging Responsego back5. Ciphering Mode Commandgo back6. Ciphering Mode Completego back7. Identity Requestgo back8. Identity Responsego back9. Setupgo back10. Call Confirmedgo back11. Assignment Commandgo back12. Assignment Commandgo back13. Alertinggo back14. Connectgo back14. Connect Acknowledgego back

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SMSSMS RequestClick to return to main pageSMS Service Request MessageClick to return to main page

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Handover processSystem Info 5 for the following Handover processMeasurement Report 1Measurement Report 2Measurement Report 3Measurement Report 4Measurement Report 5Measurement Report 6Measurement Report 7Measurement Report 8Measurement Report 9Measurement Report 10Measurement Report 11Measurement Report 12Measurement Report 13Measurement Report 14Measurement Report 15Handover CommandHandover AccessPhysical InformationHandover CompletePhysical Information

LU ProcedureChannel Requestgo backImmediate Assignmentgo backLocation Updating Requestgo backAuthentication Requestgo backAuthentication Responsego backTMSI Reallocation Commandgo backTMSI Reallocation Completego backLocation Updating Acceptgo back

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OthersChannel Request for Location UpdatingClick to return to main pageImmediate Assignment ExtendedClick to return to main pageNote:This is scheduled to allocate SDCCH for 2 mobiles simultaneously.DL Disconnect due to NO circuitsClick to return to main pageDL Disconnect Normal CauseClick to return to main pageReleaseClick to return to main pageRelease CompleteClick to return to main pageChannel ReleaseClick to return to main pageSync Channel InformationClick to return to main pageMeasurement ReportClick to return to main pageLocation Update RequestClick to return to main pageLocation Updating AcceptClick to return to main pageClassmark EnquiryClick to return to main pageClassmark ChangeClick to return to main pageChannel Request for Call re-establishmentClick to return to main pageImmediate Assignment for Call re-establishmentClick to return to main pageCM Re-establishment RequestClick to return to main pageCM Service RejectClick to return to main pageCM Service AcceptClick to return to main pageCell Broadcast PageClick to return to main pageChannel Mode ModifyClick to return to main pageNoteIn dedicated mode or group transmit mode, higher layers can request the setting of the channel mode.The channel mode modify procedure allows the network to request the mobile station to set the channelmode for one channel. The channel mode covers the coding, decoding and transcoding mode used on theindicated channel.Channel Mode Modify AcknowledgeClick to return to main page

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