47579146-GSM-Signalling-Procedure

GSM Signaling Procedure: 

GSM Signaling Procedure Huawei Vietnam RF Team

GSM Network Protocol: 

Page 1 DTAP RSL OML GSM Network Protocol

GSM Network Protocol: 

Page 2 Layer 3 Introduction RR : （ Radio Resource Management ） Control by MS 、 BTS and BSC Function Sample Paging Management Ciphered Mode Management Frequency Redefinition Dedicated Channel Assignment Handover Management Measures and Power Control MM : （ Mobility Management ） Control by MS and MSC / VLR Function Sample Authentication / Identification Procedures Location Updating IMSI Attach / Detach GSM Network Protocol

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Page 3 CC : （ Call Control ） Control by MS and MSC Function Sample Call processing and routing Short Message Service Supplementary Service GSM Network Protocol

GSM Frame Structure: 

Page 4 GSM Frame Structure

GSM Multi-Frame Channel: 

Page 5 GSM Multi-Frame Channel

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Page 6 GSM Multi-Frame Channel

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Page 7 Content Establish Signaling Link, used for signaling transmission When MS want to connect to network, firstly must establish the radio signaling link and A-interface link Step included Paging Procedure Random Access Procedure Immediate Assignment Procedure SCCP Connection Establishment Procedure Singling Link Establish Procedure

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Page 8 MS BTS BSC MSC Channel Request Channel Required Channel Activation （ SD ） Channel Act Ack （ SD ） Immediate Assignment Command UI Imm Assignment / Imm Ass Ext ST9103 ET9103 ST3126 ET3126 ST3101 SABM [L3 Info] Est Ind [L3 Info] SCCP Con Rqrd [L3] SCCP Conn Confirm ET3101 ST9105 ET9105 UA [L3 Info] （ RACH ）（ Est Cause ， Rnd Nbr ） （ Est Cause ， Rnd Nbr ， FN ， TA ） RACH_TA_Filtering （ TA ， BS/MS_TxPwr -->Max ， Chann ） Timer ； S -- Start ； E -- End Entity Um Abis A （ Rnd Nbr ， TDMA Frame Nbr ， Chan ， TA ） （ AGCH ） For 2 MS at same time （ SDCCH ） CM Serv Req ， Pag Res ， Loc Update Req Set Asynchronous Balance Unnumbered Ack Singling Link Establish Procedure

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Page 9 Singling Link Establish Procedure——Abis Abis Signaling Channel Required

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Page 10 Singling Link Establish Procedure——Abis Channel Activation

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Page 11 Singling Link Establish Procedure——Abis Immediately Assignment

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Page 12 MS BTS BSC MSC Authentication Req Ciphering Mode Cmd Authentication Req Authentication Req Authentication Resp Authentication Resp Authentication Resp Encryption Command Ciphering Mode Cmd Ciphering Mode Cmp Ciphering Mode Cmp Ciphering Mode Cmp TMSI Realloc Cmd TMSI Realloc Cmd TMSI Realloc Cmd TMSI Realloc Cmp TMSI Realloc Cmp TMSI Realloc Cmp Authentication Ciphering TMSI Realloc ST3260 ET3260 *Authentication Reject* Identification Identification Request ST3270 ET3270 Identification Request Identification Request Identification Response Identification Resp Identification Response ST3250 ET3250 （ RAND ） （ SRES ） RAND and Ki by A3 algorithm get SRES; by A8 algorithm get Kc Check SRES （ IMSI ） （ Permitted Alg ， Kc ） （ Alg ， Kc ） （ Alg （ A5 ）） （ TMSI ） VLR get from HLR the RAND/SRES/Kc Authentication, Identification, Ciphering, TMSI Re-allocation

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Page 13 Authentication Request Authentication, Identification, Ciphering, TMSI Re-allocation

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Page 14 Authentication Response Authentication, Identification, Ciphering, TMSI Re-allocation

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Page 15 Identification Response Authentication, Identification, Ciphering, TMSI Re-allocation

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Page 16 Content Normal Assignment for TCH Special case Queuing Directed Retry TCH Assignment Procedure

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Page 17 MS BTS BSC MSC Channel Activation TCH SABM (FACCH) Channel Activation Ack. Assignment Command Assignment Command Assignment Request Physical Context Request Physical Context Confirm Establish Indication UA Assignment Complete Assignment Complete Assignment Cmp RF Channel Release (SD) RF Channel Release Ack. STrr1 ETrr1 ST9108 ET9108 ST9103 ET9103 ST3107 ET3107 （ Chn Type ， Priority ， CIC ， DL DTX ， Queuing Flag ） （ TA ， MS/BS_TxPwr ） （ SDCCH ） （ TA ， MS/BS_TxPwr ） （ MA ， TS ， HSN ， MAIO ， MS_TxPwr ） On TCH if need signaling, then use Stealing Flag transfer TCH into FACCH TCH Assignment Procedure

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Page 18 Assignment Request EFR Queuing TCH Assignment Procedure---A interface

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Page 19 Abis TCH Assignment Procedure---Abis interface

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Page 20 Physical Context Comfirm TCH Assignment Procedure---Abis interface

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Page 21 System Information Type 5 BA List TCH Assignment Procedure---Abis interface

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Page 22 System Information Type 6 LAC/CI TCH Assignment Procedure---Abis interface

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Page 23 Assignment Command Frequency Encoding （ Bitmap 0 ） TCH Assignment Procedure---Abis interface

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Page 24 Frequency Encoding Frequency Encoding Fixed Bitmap —— Bitmap 0 —— Use for 1~124 AFRCN TCH Assignment Procedure---Abis interface

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Page 25 MS BTS BSC MSC SABM (FACCH) Channel Activation HO CMD Assignment Request Physical Con Req Chan. Act. Ack. HO Detection UA Phys. Info Assignment Cmp ST11 ST3103 Queuing Indication ET11 At this time, a TCH become free TCH Queue Assignment Request ST11 Queuing Indication ET11 A Handover alarm is raised. A target BTS is selected HO CMD HO Access ST9103 ET9103 T T S T T Establish Indication T T HO CMP T HO CMP ST3124 ET3124 ET3103 Direct Retry TCH Assignment Procedure---Queue and Direct Retry

MOC（Early Assignment）: 

Page 26 MOC （ Early Assignment ） MS BTS BSC MSC Call Proceeding ESTIN (CM_Serv_Req) RR Connection Establishment RR Connection Establishment RR Connection Establishment Authentication Procedure Authentication Procedure Authentication Procedure Ciphering Procedure Ciphering Procedure Ciphering Procedure TMSI Realloc Procedure TMSI Realloc Procedure TMSI Realloc Procedure SETUP SETUP SETUP Call Proceeding Call Proceeding Assignment Procedure Assignment Procedure Assignment Procedure Alerting Alerting Alerting Connect Connect Connect Connect Ack. Connect Ack. Connect Ack. Speech CM_Serv_Req （ called party nbr ） Establish TCH first, then connect another part. Alerting transfer on TCH （ CM Serv Type ， Mobile ID ， Classmark2 ， Priority ，） SDCCH TCH

MOC —— A interface: 

Page 27 MOC —— A interface A interface Two times Classmark Update, the 1st one is caused by Early Classmark Sending (ECSC); 2nd caused by BSC send Classmark Enquiry

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Page 28 CM Service Request MOC est/pkt mode con estab Short message service Suppl service activation CLASSMARK MOC —— A interface

MOC —— A interface: 

Page 29 CLASSMARK Include MS Revision Level MS Ciphering Capability MS Frequency Capability MS RF Power Capability in Each Band MOC —— A interface

MOC —— A interface: 

Page 30 CLASSMARK MOC —— A interface

MOC —— A interface: 

Page 31 Setup MOC —— A interface Called Number

MOC（Late Assignment）: 

Page 32 MS BTS BSC MSC Call Proceeding ESTIN (CM_Serv_Req) RR Connection Establishment RR Connection Establishment RR Connection Establishment Authentication Procedure Authentication Procedure Authentication Procedure Ciphering Procedure Ciphering Procedure Ciphering Procedure TMSI Realloc Procedure TMSI Realloc Procedure TMSI Realloc Procedure SETUP SETUP SETUP Call Proceeding Call Proceeding Assignment Procedure Assignment Procedure Assignment Procedure Alerting Alerting Alerting Connect Connect Connect Connect Ack. Connect Ack. Connect Ack. Speech CM_Serv_Req SDCCH TCH Establish another side channel, then setup TCH , Alerting send on SDCCH MOC （ Late Assignment ）

MTC: 

Page 33 MS BTS BSC MSC Call Confirmed ESTIN (Paging Resp) RR Connection Establishment RR Connection Establishment RR Connection Establishment Authentication Procedure Authentication Procedure Authentication Procedure Ciphering Procedure Ciphering Procedure Ciphering Procedure TMSI Realloc Procedure TMSI Realloc Procedure TMSI Realloc Procedure SETUP SETUP SETUP Call Confirmed Call Confirmed Assignment Procedure Assignment Procedure Assignment Procedure Alerting Alerting Alerting Connect Connect Connect Connect Ack. Connect Ack. Connect Ack. Speech Paging Response Paging Paging Command Paging Request ST3113 ET3113 Paging Group Number: defined by BS_AG_BLKS_RES and BS_PA_MFRMS;MS belong to the Paging Group = (IMSI mod 1000) mod N;MS only monitor its own Paging Group ’ s Paging Req message （ MS ID （ TMSI+IMSI/IMSI ）， Cell ID （ LAC/LAC+CI ）） （ MS ID （ TMSI/IMSI ）， Paging Group ） （ MS ID （ TMSI/IMSI ）） （ Max 4 TMSI ） （ Mobile ID ， Classmark2 ， Priority ，） （ calling party nbr ） MTC

MTC —— A interface: 

Page 34 A-interface MTC —— A interface

MTC —— A interface: 

Page 35 Paging IMSI, BSC use it for calculate Paging Group TMSI, it’s save bits number in radio resource for Paging LAC Paging MTC —— A interface

MTC —— A interface: 

Page 36 Paging Response MTC —— A interface

MTC —— A interface: 

Page 37 Setup MTC —— A interface Calling Number

Location Update: 

Page 38 MS BTS BSC MSC Clear CMD ESTIN (Loc Up Req) RR Connection Establishment RR Connection Establishment RR Connection Establishment Authentication Procedure Authentication Procedure Authentication Procedure Ciphering Procedure Ciphering Procedure Ciphering Procedure TMSI Realloc Procedure TMSI Realloc Procedure TMSI Realloc Procedure Loc Up Accept Channel Release Deactivate SACCH DISC Release Indication UA RF Ch Release Loc Up Req Loc Up Accept Loc Up Accept Channel Release RF Ch Release Ack Clear CMP ST3210 ET3210 （ LU Type ， MS ID ， LAI ， Classmark1 ，） Location Update

Location Update —— A interface: 

Page 39 A interface Location Update —— A interface

Location Update —— A interface: 

Page 40 Location Update Request Location Update —— A interface （ Follow-on ） call procedure Old LAC Current TMSI

Location Update —— A interface: 

Page 41 Location Update Accept Location Update —— A interface New LAC Re-allocated TMSI

Intra Cell HO: 

Page 42 MS BTS BSC MSC Measurement Rep Measurement Res Intra cell HO Phys Context Req OC OC Phys Context Conf OC : Old Channel NC : New Channel NC NC Channel Activation Ack Channel Activation Handover Command Assignment Command OC SABM Establish Indication UA OC NC NC NC Assignment Complete NC Assignment Complete Handover Performed RF Channel Rel OC RF Channel Rel Ack. OC ST9108 ET9108 ST9103 ET9103 ST3107 ET3107 ST_RCR_ACK ET_RCR_ACK Old TA 、 MS/BS_TxPwr will be reused in new channel （ HO Cause ， Cell ID ， Chn Type ） Intra Cell HO

Intra Cell HO —— Abis: 

Page 43 Abis Intra Cell HO —— Abis

Intra Cell HO —— Abis: 

Page 44 Assignment Command Intra Cell HO —— Abis Old TCH New TCH Channel

Internal Inter Cell HO——Synchronized HO: 

Page 45 MS BTS serving BSC MSC BTS target Meas Report Meas Result HO Alarm & Candidate Cell Phys Context Req Phys Context Conf Channel Activation Channel Act Ack. HO Command HO Command HO Access HO Detection SABM Establish Ind UA Handover Complete Handover Complete Handover Performed RF Channel Release RF Channel Rel. Ack. ST9108 ET9108 ST9103 ET9103 ST3103 ST3103 ST3106 ET3106 ST_RCR_ACK ET_RCR_ACK ST200 ET200 Old TA is reused in new channel, but MS/BS_TxPwr will use the MAX in new channel （ AB ， DCH ） （ Cell ， MA ， MAIO ， HSN ， TS ， TA ） Internal Inter Cell HO——Synchronized HO

Internal Inter Cell HO——asynchronous: 

Page 46 MS BTS serving BSC MSC BTS target HO Alarm & Candidate Cell Channel Activation Channel Act Ack. HO Command HO Command HO Access HO Detection SABM Establish Ind UA Handover Complete Handover Complete Handover Performed RF Channel Release RF Channel Rel. Ack. ST9103 ET9103 ST3103 ST3103 ST3105 ET3105 Physical Info ST3124 ET3124 ST200 ET200 ST_RCR_ACK ET_RCR_ACK Phys Context Req Phys Context Conf ST9108 ET9108 Meas Report Meas Result No Physical Cont Req procedure, old channel TA can ’ t reuse for new channel Measure TA （ TA ） （ TA is reused ） Internal Inter Cell HO——asynchronous

Internal Inter Cell HO——A interface: 

Page 47 Internal Inter Cell HO——A interface HO Performed HO Cause Target Cell

External Inter Cell HO: 

Page 48 MS BTS serving BSC serving MSC BTS target Meas Report Meas Result HO Alarm & Candidate Cell Channel Activation Channel Act Ack. HO Command HO Command HO Access HO Detection SABM Establish Ind UA Handover Complete Handover Complete HO Complete RF Channel Release RF Ch. Rel. Ack. BSC target HO Required HO Request HO Request Ack. HO Command Phys Information （ SCCP Con Required ） （ SCCP Con Conf ） . Clear Command Clear Complete SCCP Released SCCP Rel. Cmp. STrr2 ET3124 ETrr2 ST_HO_REQ_Lost ST9103 ST9103 ST9113 ST3103 ET3103 ST3124 ST200 ET200 ST3106 ET3106 ST8 ET8 External Inter Cell HO ET9113 ET_HO_REQ_Lost

External Inter Cell HO---A interface: 

Page 49 External Inter Cell HO---A interface A interface —— outgoing A interface------incoming

External Inter Cell HO——A interface: 

Page 50 External Inter Cell HO——A interface HO Required HO Cause Target Cell

External Inter Cell HO——A interface: 

Page 51 External Inter Cell HO——A interface HO Command Target cell ： BCCH/BSIC Target cell channel type Use for HO Access Initial power for new channel

External Inter Cell HO——A interface: 

Page 52 External Inter Cell HO——A interface Clear Command

External Inter Cell HO——A interface: 

Page 53 External Inter Cell HO——A interface HO Request （ 1 of 2 ） Channel type encryption Classmark2

External Inter Cell HO——A interface: 

Page 54 External Inter Cell HO——A interface HO Request （ 2 of 2 ） Source cell Priority and Queuing A interface’s CIC Target cell Classmark3

External Inter Cell HO——A interface: 

Page 55 External Inter Cell HO——A interface HO Request Ack HO Command

External Inter Cell HO——A interface: 

Page 56 External Inter Cell HO——A interface HO Complete

Channel Release: 

Page 57 MS BTS BSC MSC Disconnect Disconnect Disconnect Release Release Release Release Complete Release Complete Release Complete MS release Disconnect Disconnect Disconnect Release Release Release Release Complete Release Complete Release Complete Network release Channel Release

Channel Release——A interface: 

Page 58 Channel Release——A interface A interface —— MS release Call release （ DTAP layer ） BSSM release SCCP release Disconnect MS release Normal call clear

Channel Release——A interface: 

Page 59 Channel Release——A interface A interface —— Network Release Disconnect Network release Another side hung up

Channel Release: 

Page 60 Channel Release Um and A interface release is separated with each other Um Channel Release BSC send Channel Release message to MS Radio Link Failure A interface Release MSC send CLEAR COMMAD to BSC BSC send CLEAR REQUEST to MSC Channel Release

Channel Release ——Radio Channel: 

Page 61 MS BTS BSC MSC DISC (DCH) Channel Release (DCH) Deactivate SACCH Release Indication UA Phy Context Request Phy Context Confirm RF Channel Release RF Channel Release Ack ET3110 ST3110 ST3111 T3111 Expiry ST9108 ET9108 ST_RCR_ACK ET_RCR_ACK BSC send Channel Release To MS No SACCH received from the MS Connection Fail Ind RF Channel Release RF Channel Release Ack ST_RCR_ACK ET_RCR_ACK Radio Link Failure Wait for T3111 expired, then release BTS channel, to ensure the UA message have time to send Channel Release ——Radio Channel

Channel Release ——Abis: 

Page 62 Channel Release ——Abis Abis Channel release

Channel Release——A Interface Release: 

Page 63 MSC BSC Clear Request Clear Command Clear Complete SCCP Released SCCP Released Complete BSC Trigger the release Clear Command Clear Complete SCCP Released SCCP Released Complete MSC Trigger the release ST9104 ET9104 ST9101 ET9101 ST9101 ET9101 Channel Release——A Interface Release

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