L3

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 CallOther L3 Messages1Channel Request for LU2Location Update Request3Location 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 Page

* 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 13MS Originated CallMS Terminated CallChannel 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 AcceptCell Broadcast Page

Other L3 MessagesOther Messages1Channel Request for LU2Location Update Request3Location 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 Reject

Channel 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 Reject

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)

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 Acknowledge

Paging messagesPaging Message Type 1 (2 TMSI Combination)Click to return to main pagePaging 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 pageSystem Info 2 ( Idle Mode)Click to return to main pageSystem Info 3 ( Idle Mode)Click to return to main pageSystem Info 4 ( Idle Mode)Click to return to main pageSystem Info 5 ( Dedicated Mode)Click to return to main pageSystem 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 back3. CM Service Requestgo back4.Authentication Requestgo back5. Authentication Responsego back6. Ciphering Mode Commandgo back7. Ciphering Mode Completego back8. Setupgo back9. 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

OthersChannel Request for Location UpdatingClick to return to main pageImmediate Assignment ExtendedClick to return to main pageDL 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 page

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