SBS Message Flows_A50016-G5100-A041-03-7618

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InformationSystem

PM:SBS Message Flows

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Table of ContentsThis document has 233 pages.

Reason for Update . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

1 Performance Measurement Message Flows . . . . . . . . . . . . . . . . . . . . . . . . 91.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91.2 Message Flows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2 Call Setup Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112.1 Successful Mobile Originating Call (MOC), FR Call . . . . . . . . . . . . . . . . . . 112.2 Successful Mobile Terminating Call (MTC), FR Call. . . . . . . . . . . . . . . . . . 132.3 Successful Mobile Originating Call (MOC) with Direct Traffic Channel Assign-

ment, FR Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162.4 Successful (MOC) Using Early Classmark Sending, FR Call . . . . . . . . . . 182.5 Successful Mobile Terminating Call (MTC), Using Early Classmark, Sending,

FR Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222.6 Successful Mobile Terminating Call (MTC) in busy mode, new waiting call

(feature Call waiting) is accepted by called subscriber. . . . . . . . . . . . . . . 252.7 Unsuccessful Mobile Originating Call (MOC), Subscriber B Busy, FR Call 272.8 Unsuccessful Mobile Originating Call (MOC), No TCH Available, FR Call . 282.9 Successful Mobile Originated Call (MOC) in a Concentric Cell (inner area), FR

Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 292.10 Successful Mobile Emergency Call (MEC), FR Call . . . . . . . . . . . . . . . . . . 313 Unsuccessful Assignment Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . 323.1 Unsuccessful TCH Assignment Procedure with Reversion to SDCCH, FR Call

323.2 Unsuccessful TCH Assignment Procedure with Loss of ASSIGNMENT COM-

MAND (T10 < T_MSRFPCI), FR Call (T10 Expiry). . . . . . . . . . . . . . . . . . . 333.3 Unsuccessful TCH Assignment Procedure with Loss of ASSIGNMENT COM-

MAND (T10 > T_MSRFPCI), FR Call (T_MSRFPCI Expiry). . . . . . . . . . . . 333.4 Unsuccessful TCH Assignment Procedure LAPDm I-Frame with

ASSIGNMENT COMMAND not acknowledged by MS (T200 Expiry), FR Call35

4 Call Release Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 364.1 Normal Call Release (Originated by MS), FR Call . . . . . . . . . . . . . . . . . . . 364.2 Normal Call Release (Originated by Network), FR Call . . . . . . . . . . . . . . . 364.3 Abnormal Call Release Procedure; Call drop: BTS sends CONNECTION

FAILURE INDICATION to the BSC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 374.4 Abnormal Call Release Procedure; Call drop: BTS sends ERROR

INDICATION to the BSC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 404.5 Abnormal Call Release; BTS sends RELEASE INDICATION during a stable

call phase to the BSC, FR Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

5 Inter-Cell Handover, Intra-BSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 445.1 Successful Inter-Cell Handover, Intra-BSC, FR Call. . . . . . . . . . . . . . . . . . 445.2 Unsuccessful Inter-Cell Handover Attempt, Intra-BSC, No TCH Available in

Target Cell, FR Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 465.3 Unsuccessful Inter-Cell Handover, Intra-BSC, with Reversion to Old TCH

(T3124 Expiry), FR Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

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5.4 Unsuccessful Inter-Cell Handover, Intra-BSC, with Loss of MS (Loss of HO CMD, T8TTRAU), FR Call (TTRAU Expiry) . . . . . . . . . . . . . . . . . . . . . . . . 50

5.6 Unsuccessful Inter-Cell Handover, Intra-BSC, with Loss of MS, Handover Ac-cess Failure (No SABM after Transmission of PHYSICAL INFO, [(NY1+1) * T3105]

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8 Directed Retry, Intra-BSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 998.1 Successful Directed Retry, Intra-BSC, FR Call . . . . . . . . . . . . . . . . . . . . . . 998.2 Unsuccessful Directed Retry, Intra-BSC, No Target Cell Available, FR Call .

1018.3 Unsuccessful Directed Retry, Intra-BSC, 1 Target Cell Available, Target Cell

Congested, FR Call. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1028.4 Unsuccessful Directed Retry, Intra-BSC, with Reversion to SDCCH, FR Call

(T3124 Expiry) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1038.5 Unsuccessful Directed Retry, Intra-BSC, with Loss of MS (Loss of HO CMD,

T8 < TTRAU), FR Call (T8 Expiry) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1058.6 Unsuccessful Directed Retry, Intra-BSC, with Loss of MS (Loss of HO CMD,

T8 > TTRAU), FR Call (TTRAU Expiry) . . . . . . . . . . . . . . . . . . . . . . . . . . 1079 Directed Retry, Inter-BSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1099.1 Successful Directed Retry, Inter-BSC, FR Call . . . . . . . . . . . . . . . . . . . . . 1099.2 Unsuccessful Directed Retry, Inter-BSC, FR Call, no Radio Resource avail-

able in Target Cell. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1129.3 Unsuccessful Directed Retry, Inter-BSC, with Reversion to SDCCH, FR Call

(T3124 Expiry) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1139.4 Unsuccessful Derected Entry, Inter-BSC, with Loss of MS (Loss of HO CMD,

T8 < Trr7), FR Call (T8 Expiry) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1169.5 Unsuccessful Directed Retry, Inter-BSC, with Loss of MS (Loss of HO CMD,

T8 > Trr7), FR Call (Trr7 Expiry) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11810 Forced Handover Due to O & M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12010.1 Successful Forced Handover Due to O & M . . . . . . . . . . . . . . . . . . . . . . . 12010.2 Successful Forced Handover Due to O & M, Inter-BSC, FR Call . . . . . . . 12210.3 Successful Forced Intra-Cell Handover Due to O & M, FR Call . . . . . . . . 124

11 Handover due to BSS Resource Management Criteria (Traffic Handover) 12511.1 Successful Handover due to BSS Resource Management Criteria (Traffic

Handover), FR Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12511.2 Unsuccessful Inter-Cell Handover due to BSS Resource Management Criteria

(Traffic Handover), traffic load in Target Cell exceeds the threshold TRFLTH128

12 Queuing & Preemption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13012.1 Queuing: Queued Assignment Request for FR TCH Is Served Before T11PUB

or T11WPS Expiry, Directed Retry Enabled But No Target Cell Available, Pre-emption Disabled or Not Allowed for the Requesting Call . . . . . . . . . . . . 130

12.2 Queuing: Queued Assignment Request for FR TCH is Discarded from the Queue Before T11PUB or T11WPS Expiry Due to an Incoming FR Assignment Request with Higher Priority Directed Retry Enabled But No Tar-get Cell Available, Preemption Disabled or Not Allowed for the Requesting Call132

12.3 Queuing: Queued Assignment Request for FR TCH Is Discarded from Queue Due to T11PUB or T11WPS Expiry, Directed Retry Enabled But No Target Cell Available, Preemption Disabled or Not Allowed for the Requesting Call . 134

12.4 Queuing: Queued Handover Request for FR TCH Is Served Before TQHO-PUB or TQHOWPS Expiry, Preemption Disabled or Not Allowed for the Requesting Call. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135

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12.5 Queuing: Queued Handover Request for FR TCH Is Discarded from the Queue Before TQHOPUB or TQHOWPS Expiry Due to an Incoming FR Call with Higher Priority, Preemption Disabled or Not Allowed for the Requesting Calls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137

12.6 Queuing: Queued Handover Request for FR TCH Is Discarded from the Queue Due to TQHOPUB or TQHOWPS Expiry, Preemption Disabled or Not Allowed for the Requesting Calls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139

12.7 Preemption: Successful Forced Inter-Cell Handover Due to Preemption, Pre-empted Assignment Request and Preempting Call Are Both FR. . . . . . . . 140

12.8 Preemption: Forced Release of Preempted Call Due to Lack of Target Cell for Forced Inter-Cell Handover Procedure, Preempted and Preempting Call Are Both FR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142

12.9 Preemption: Successful Forced Inter-BSC Handover Due to Preemption, Pre-empting Handover Request and Preempted Call Are Both FR, Originating BSC of the Preempting Handover Request and Target BSC for the Forced Handover Are the Same . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

13 HSCSD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14513.1 Successful HSCSD Call, Mobile Originating, 3 TCHs Used . . . . . . . . . . . 14513.2 Successful Inter-cell Handover of an HSCSD Call (3 TCHs Used), Intra-BSC

14813.3 Forced Intra-cell Handover During HSCSD Assignment Procedure . . . . . 151

14 Signaling Transactions without TCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15314.1 Successful Location Update (Phase 2 MS) . . . . . . . . . . . . . . . . . . . . . . . . 15314.2 Successful Location Update (2G/3G (GSM/UMTS) Multirat MS). . . . . . . . 15514.3 Successful IMSI Detach (Phase 2 MS) . . . . . . . . . . . . . . . . . . . . . . . . . . . 15714.4 Successful Supplementary Service (SS) Management Procedure via Sub-

scriber-Controlled Input (SCI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15814.5 Successful USSD (Unstructured Supplementary Service Data) Management

Procedure via (SCI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16014.6 Unsuccessful Immediate Assignment Procedure, No SDCCH Available. . 16214.7 Unsuccessful Immediate Assignment Procedure with DELETE INDICATION

(no AGCH available or AGCH message timeout) . . . . . . . . . . . . . . . . . . . 16314.8 Unsuccessful Immediate Assignment Procedure, assigned SDCCH is not

seized by the MS (Phantom RACH Scenario) . . . . . . . . . . . . . . . . . . . . . . 16414.9 BTS Discards Invalid RACH Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . 16514.10 Immediate Assignment Procedure for Abis Link Configured via Satellite Link.

16614.11 Paging Overload - BTS discards a PAGING REQUEST Message . . . . . . 167

15 Short Message Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16815.1 Successful SMS Mobile Originating in Idle Mode (Phase 2 MS) . . . . . . . . 16815.2 Successful SMS Mobile Terminating in Idle Mode (Phase 2 MS) . . . . . . . 17015.3 Successful SMS Mobile Originating in Connected Mode (FR Call Ongoing). .

17215.4 Successful SMS Mobile Terminating in Connected Mode . . . . . . . . . . . . . 173

16 Advanced Speech Call Items (ASCI) Procedures . . . . . . . . . . . . . . . . . . . 17416.1 VBS/VGCS Setup Initiated by fixed Dispatcher and Release . . . . . . . . . . 17416.2 Succesful Uplink Allocation Procedure (1) . . . . . . . . . . . . . . . . . . . . . . . . . 17616.3 FREE Uplink Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178

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16.4 VGCS Setup initiated by Service Subscriber and Release. . . . . . . . . . . . 17916.5 VGCS SETUP initiated by Service Subscriber (FAST CALL SETUP) . . . 18116.6 MTC During Ongoing VBS/VGCS Connection . . . . . . . . . . . . . . . . . . . . . 18216.7 VBS/VGCS Call during Ongoing Speech Call . . . . . . . . . . . . . . . . . . . . . 183

17 Inter System Handover (2G 3G), circuit switched (CS). . . . . . . . . . . 18417.1 Successful Inter System Handover (2G --> 3G) . . . . . . . . . . . . . . . . . . . . 18517.2 Unsuccessful Inter System Handover (2G --> 3G), loss of MS (loss of HOC-

MD), T3121 expiry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18717.3 Unsuccessful Inter System Handover (2G --> 3G), No TCH available in Target

UMTS Cell (3G) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18917.4 Unsuccessful Inter System Handover (2G --> 3G), Reversion to old TCH,

T3124 expiry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19017.5 Successful Inter System Handover (3G --> 2G) . . . . . . . . . . . . . . . . . . . . 19117.6 Unsuccessful Inter System Handover (3G --> 2G), No TCH available in Target

GSM Cell (2G) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19318 Other Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19418.1 Idle Traffic Channel Supervision . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19418.2 Uplink and Downlink Measurement Reports on Abis . . . . . . . . . . . . . . . . 19518.3 IMSI Trace Invocation for Normal Call Setup . . . . . . . . . . . . . . . . . . . . . . 19618.4 IMSI Trace Invocation for Incoming Inter-BSC Handover. . . . . . . . . . . . . 197

19 GPRS Message Flows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19819.1 GPRS Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19819.1.1 GPRS Mobility Management: Attach Procedure. . . . . . . . . . . . . . . . . . . . 19819.1.2 GPRS Mobility Management: Detach Procedure . . . . . . . . . . . . . . . . . . . 19919.1.3 GPRS Session Management: Activate PDP Context . . . . . . . . . . . . . . . . 20019.1.4 GPRS Session Management: Deactivate PDP Context . . . . . . . . . . . . . . 20119.1.5 GPRS: Paging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20119.1.6 GPRS Mobility Management: Routing Area Update . . . . . . . . . . . . . . . . . 20219.1.7 GPRS Mobility Management: Cell Update . . . . . . . . . . . . . . . . . . . . . . . . 20319.1.8 GPRS: Suspend / Resume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20519.2 Inter System Cell Reselection Procedure (2G 3G), packet oriented (PO),

intra SGSN inter system change. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20619.2.1 Successful Inter System Cell Reselection Procedure (2G --> 3G) . . . . . . 20619.2.2 Successful Inter System Cell Reselection Procedure (3G --> 2G) . . . . . . 20919.3 RLC/MAC Message Flows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21219.3.1 Uplink TBF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21319.3.2 Downlink TBF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21619.3.3 Concurrent UL TBF. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21919.3.4 Concurrent DL TBF. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222

20 Counter / Message Abbreviations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226

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Reason for Update

Reason for UpdateIssue History

Issue 3 for Release BR9.0

Inter-Cell Handover, Inter-BSC (6) Update of inter BSC handover procedures: deletion of ATINHIRC

Issue Date Summary01 12/2006 New release BR9.0 02 04/2007 Minor changes03 12/2007 Minor changes

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PM:SBS Message Flows Performance Measurement Message Flows

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1 Performance Measurement Message Flows

1.1 IntroductionThis manual is a collection of messages of call and signaling transactions exchanged between the BSS NEs (BSC, BTS, TRAU) on the Um, Abis and A interfaces which trigger the related Performance Measurement counters during the execution of specific call processing and GPRS procedures.g The message flows are typical examples for the affected signaling transactions.

Depending on specific settings in the involved NEs (MSC, BSC), flow traces taken from real mobile networks can differ from the message flows (especially for the Authentication, Ciphering, Early Classmark Sending and TMSI Reallocation sub-procedures).

g In current BR9.0 Release, both BSC1 (BSC/72, BSC/120) and eBSC can run together in the same mobile network. In this manual, the term BSC identifies the BSC1 and the eBSC. In case a message flow depends on a specific BSC type, it will be highlighted in the description.

The messages exchanged between the BSS NEs (MS, BTS, BSC) and the Core Network (MSC, SGSN) are reported in this manual respecting the convention adopted by the most common protocol analyzers (e.g. K1103, K1205, etc.). The Chapter 2 Abbreviations puts in relationship the abbreviations and the complete message names defined by GSM and the Siemens Abis specifications.In addition to the messages, the SBS performance measurement counters are embedded into the message flows in such a way that the association of one or more counters of each Performance Measurement to their triggering events becomes clear. As a general rule, the appearance of a counter within a message flow means that its value is increased by 1.Eventual deviations from this rule are explicitely mentioned in the message flows.The following convention is adopted to indicate also the subcounters of the specific mea-surements:

(.).Example:ATINHIRC (2.) means that the second counter of the ATINHIRC (downlink quality) measurement is increased by 1 by the marked event.

It is out of the scope of this manual the description of each Performance measurement, related counters and trigger events. For more information, see the PM:SBS Counter manual.

g The blue color generally indicates the events on the handover target resources if not otherwise defined.In the 12.2 procedure the blue color indicates the events related to the second (high priority) call. In the 12.5 procedure the blue color indicates the events related to the high priority call.In the 12.7, 12.1 and 12.9 procedures the blue color indicates the events related to preempting call.

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Performance Measurement Message Flows

In the 6.7 procedure the red color indicates the BSC serving the first (really external) target cell in the target cell list of the HANDOVER REQUIRED message.

g It is out of the scope of this manual the description ot the SMLC specific message flows that are reported in the PM: SMLC Message Flows manual. This manual and the PM:SMLC Message Flows manuals should be used together, if applicable.

This manual is structured as follow:1. Performance Measurement Message Flows: This chapter contains an introduction

to the manual, and the message flows grouped for set of procedures. Each set of procedure is a subchapter of chapter 1 (Example: 1.2.1 Call setup procedures. This subchapter contains the messages related to the Call setup procedures)

2. Counter/Message Abbreviations: This chapter contains the relation between each message, its long name and type in table form

3. Abbreviations: This chapter contains the list of all the abbreviations used in the manual

1.2 Message FlowsThis chapter contains the message flows related to the most common Call Processing and GPRS procedures exchanged between the MS, the BSC, BTS, BSC and the Core Network (represented by the MSC and SGSN nodes). Each procedure is contained in a subchapter of this chapter.The message flows are presented in graphic form. The UL and DL direction of each message is represented with dotted arrows. In case a message triggers the counters of the related Performance Measurements, the Performance Measurement is reported in the graphic near the message.

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PM:SBS Message Flows Call Setup Procedures

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2 Call Setup Procedures

2.1 Successful Mobile Originating Call (MOC), FR Call

BTS BSCMS MSC

CHNRD

NSUCCHPC (4.)NASUSDPE

CHNREQ

UI (IMASS)

SABM (CMSREQ)

UA

ESTIN (CMSREQ)

CHNAV (SDCCH)CHNAK

IACMD (IMASS)

TACCBPRO (2.)SUIMASCA (4.)NACSUCPR (2.)

RACH

AGCH

SDCCH

SDCCH

DT1 (CICMP)

I (CIMCMD)I (CIMCMP)

ENCRY (CIMCMD)

MRPCI

DATIN (CIMCMP)

DT1 (CICMD)

SDCCH

SDCCH

DT1 (AUTREP)

I (AUTREQ)I (AUTREP)

DATRQ (AUTREQ)

DATIN (AUTREP)

CC (AUTREQ)

SDCCH

SDCCH

CR (CL3I; CMSREQ)

NATTSDPE NACSUCPR (3.)ATIMASCA (4.)If last SDCCH startASDCALTI

Start T_MSRFPCI

Stop T_MSRFPCI

Stop T3101

NTDMAGCH (1.)

CHALNHLY (19.) If layer is not the pre-ferred one CHALNHLY (1.)]MBUSYSD (+)

12 A50016-G5100-A041-03-7618


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Call Setup Procedures

BTS BSCMS MSC

I (ASS CMD)

PHCRQ

PHCCN

CHNAV (TCH)

CHNAK

DATRQ (ASS CMD)

MTCHBUTI (1.) (start)

DT1 (ASS REQ)

SDCCH

Start TTRAU

Start T_MSRFPCI

Stop TTRAU (**)

I (ASS CMP)

SABM

UA

ESTIN

DATIN (ASS CMP)

MRPCI

DT1 (ASS COM)FACCH

FACCH

FACCH

Stop T_MSRFPCI

DATIN (SETUP)SETUP DT1 (SETUP)DT1 (CPROC)

SDCCH

I (CPROC) DATRQ (CPROC)SDCCH

ATTCHSEI (1.)TASSATT (2.)If last TCH startAALTCHTI (1.)

RELCNRCHRL (SDCCH)RCHRA

ASDCALTI (stop)MBUSYSSP (1.) (accumulation)MBUSYSD (-)

RELRQ

Start T10

Stop T10

CHALNHLY[20 (Full V1/V2) or 21(AMR)]If layer is not the pre-ferred oneCHALNHLY[2 or 3]

MEBUSTCH [1]MEBUTSLY [FR & LY]MBTCHCHT 1 if FV1, 2 if FV2, 3 if FV3ABISPDIS [1], ABISPSUP [6]If last abis, start ABISPSUP [5]

TNTCHCL (1.)

SUCTCHSE (1.)TASSSUCC (2.)

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13


Id:0900d805801274ef

2.2 Successful Mobile Terminating Call (MTC), FR Call

BTS BSCMS MSC

I (CONACK)

DT1 (ALERT)I (ALERT) DATRQ (ALERT)

DATIN (CONACK) DT1 (CONACK)

DT1 (CONNECT)DATRQ (CONNECT)I (CONNECT)

FACCH

FACCH

FACCH

Conversation phase ...

TTRAU is stopped when the BTS receives the (idle) TRAU frames from the TRAU. This happens when the BSC throughconnects the Asub-TCH to the Abis-TCH. In case of TCH Assignment this is done on transmission of the ASSIGNMENT COMMAND.

(**)

called party is reachable and idle (ringing)

called party has accepted the call

14 A50016-G5100-A041-03-7618


Id:0900d805801274ef


BTS BSCMS MSCPGCMD

CHNAV (SDCCH)

TACCBPRO (1.)



UDT (PAGIN)

CHNRD

CHNAK

IACMD (IMASS)

UA

ESTIN (PAGRES)

(CL3L; PAGRES)

UI (IMASS)

SABM (PAGRES)

AGCH

SDCCH

UI (PAGREQ)PCH

SDCCH

CHNREQ

RACH

DATRQ (TRCMD)I (TRCMD)

I SETUPI (TRCMP)

DT1 (SETUP)DATIN (SETUP)

DATIN (TRCMP) DT1 (TRCMP)I (CCONF) DATRQ (CCONF)

DT1 (CCONF)

SDCCH

SDCCH

SDCCH

SDCCH

Start T_MSRFPCI

Start T3101

Stop T3101

MRPCIStop T_MSRFPCI

DT1 (TRCMD)

Optional: Authentication & Ciphering Procedure ... (see 2.1)

NTDMPCH (1.)

NTDMAGCH (1.)

NATTSDPENACSUCPR (1.), (3.)ATIMASCA (1.)If last SDCCH startASDCALTI

CHALNHLY [19] If layer is not the preferred one CHALNHLY [1]MBUSYSD (+)

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15


Id:0900d805801274ef

BTS BSCMS MSC

PHCRQ

PHCCN


DT1 (ASREQ)

CHNAV (TCH)

CHNAK

DATRQ (ASS CMD)

I (ASS CMD)SABM

ESTIN

DATIN (ASS CMP)

Start TTRAU

Start T_MSRFPCI

Stop TTRAU (**)

SDCCH

FACCH

DT1 (ASS COM)


I (ASS CMP)FACCH

UAFACCH

MRPCI

Stop T_MSRFPCI


Start T10

Stop T10

RELRQ

RCHRL (SDCCH)RCHRA

RELCN

ASDCALTI(stop)MBUSYSSP (1.) (accumulation)MBUSYSD (-)

CHALNHLY[20 (Full V1/V2) or 21(AMR)]If layer is not the preferred oneCHALNHLY[2 or 3]t


TNTCHCL (1.)

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2.3 Successful Mobile Originating Call (MOC) with Direct Traffic Channel Assignment, FR Call

BTS BSCMS MSC

I (CONACK)

DT1 (ALERT)I (ALERT)

DATIN (ALERT)

DATRQ (CONACK) DT1 (CONACK)

DT1 (CONNECT)DATIN (CONNECT)I (CONNECT)

FACCH

FACCH

FACCH



(**)

called MS is ready (ringing)

called MS has accepted the call

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17


Id:0900d805801274ef

BTS BSCMS MSC

CHNAV (TCH)

CHNAK

NSUCCHPC (12.)TNTCHCL (1.)

CHNRD

IACMD (IMASS)

ESTIN (CMSREQ)

MRPCI

UI (IMASS)

SABM (CMSREQ)

AGCH

FACCH

CHNREQRACH

MTCHBUTI (1.) (start)Start TTRAU

Start T_MSRFPCI

Stop TTRAU (**)

Stop T_MSRFPCI

I (SETUP) DATIN (SETUP)DT1 (SETUP)FACCH

UAFACCH

Optional: Authentication & Ciphering Procedure ... (see 2.1)

DATRQ (CPROC)I (CPROC)

DT1 (CPROC)

FACCH

CR (CL3I;CMSREQ)


Start T3101

Stop T3101

NTDMAGCH (1.)

ABISPDIS [1], ABISPSUP [6]If last abis, start ABISPSUP [5] MEBUSTCH-1

MEBUSTLY

ATTCHSEI (1.)ATIMASCA (4.)NASCUCPR (3.)If last TCH startAALTCHTI (1.)

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2.4 Successful (MOC) Using Early Classmark Sending, FR Call

BTS BSCMS MSC

MOMRQ

DT1 (ASS COM)

SUCTCHSE (1.)TASSUCC (2.)

I (CHMM)

I (CHMMACK)

MOMAK

DATRQ (CHMM)

DATIN (CHMMACK)

DT1 (ASS REQ)

DT1 (CONNECT)DATRQ (CONNECT)

I (CONNECT)I (CONACK)

DATIN (CONACK)DT1 (CONACK)

DT1 (ALERT)DATRQ (ALERT)I (ALERT)

FACCH

FACCH

FACCH

FACCH

FACCH



(**)

TASSATT (2.)

In case of direct TCH assignment the timer T10 is not used. Two not-administrable system internal timers are used, one for the control of the MOMRQ procedure, one for the control of the CHMM procedure. In case of expiry of one of these timers, the BSC sends an ASS FAI with cause equipment failure to the MSC.

(***)



MBTCHCHTCHALNHLY[20 (Full V1/V2) or 21(AMR)]If layer is not the pre-ferred one alsoCHALNHLY [2 or 3](***)

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19


Id:0900d805801274ef

BTS BSCMS MSC

CHNAV (SDCCH)CHNAK

NATTSDPENACSUCPR (3.)ATIMASCA (4.)If last SDCCH startASDCALTI



CHNRD

IACMD (IMASS)

ESTIN (CMSREQ)

MRPCI

I (CLAMCH)

CC (CICMD)ENCRY (CIMCMD)

DATIN (CLAMCH)DT1 (CLUPD)

I (CIMCMP) DATIN (CIMCMP) DT1 (CICMP)

I (TRCMD)DT1 (TRCMD)

UI (IMASS)

I (CMSREQ)

AGCH

SDCCH

CHNREQRACH

SDCCHI (CIMCMD)

SDCCH

SDCCH

SDCCH

CR (CL3I; CMSREQ)

I (CPROC) DATRQ (CPROC)

DATIN (SETUP)I (SETUP) DT1 (SETUP)

DT1 (CPROC)SDCCH

SDCCH

Start T3101

Stop T3101

Stop T_MSRFPCI

Start T_MSRFPCI

MRPCI

DATRQ (TRCMD)

NTDMAGCH (1.)

CHALNHLY [19] If layer is not the pre-ferred one CHALNHLY [1]MBUSYSD (+)

20 A50016-G5100-A041-03-7618


Id:0900d805801274ef


BTS BSCMS MSCDT1 (ASREQ)

PHCRQ

PHCCN

CHNAV (TCH)

CHNAK

DATRQ (ASS CMD)

ESTIN

I (ASS CMD)

I (ASS CMP)

DATIN (ASS CMP)

DT1 (TRCMP)I (TRCMP)

DATIN (TRCMP)

DT1 (ASS COM)MRPCI

Start TTRAU

Start T_MSRFPCI

Stop TTRAU (**)

FACCH

Stop T_MSRFPCI

SDCCH

SDCCH

SABM

FACCH

UAFACCH

ATTCHSEITASSATT (2.)If last TCH startAALTCHTI (1.)


Start T10

Stop T10

RELRQ

RELCN

RCHRL (SDCCH)RCHRA

TNTCHCL (1.)SUCTCHSE (1.)TASSSUCC (2.)


CHALNHLY[20 (Full V1/V2) or 21(AMR)]If layer is not the preferred oneCHALNHLY[2 or 3]


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21


Id:0900d805801274ef

BTS BSCMS MSC

DT1 (ALERT)

Call setup continuation ...


(**)

DATRQ (ALERT)I (ALERT)

FACCH


22 A50016-G5100-A041-03-7618


Id:0900d805801274ef


2.5 Successful Mobile Terminating Call (MTC), Using Early Classmark, Sending, FR Call

BTS BSCMS MSCPGCMD

CHNAV (SDCCH)

TACCBPRO (1.)



NATTSDPENACSUCPR (1.), (3.)ATIMASCA (1.)If last SDCCH startASDCALTI

UDT (PAGIN)

CHNRD

CHNAK

IACMD (IMASS)

UA

ESTIN (PAGRES)

UI (IMASS)

SABM (PAGRES)

AGCH

SDCCH

UI (PAGREQ)PCH

SDCCH

CHNREQRACH

DT1 (CICMP)

Start T_MSRFPCI

Start T3101

Stop T3101

ENCRY (CIMCMD)I (CIMCMD)SDCCH

I (CLAMCH)SDCCH

I (CIMCMP)SDCCH

DATIN (CLAMCH) DT1 (CLUPD)MRPCI

Stop T_MSRFPCI

DATIN (CIMCMP)

CR (CL3I; PAGRES)

CC (CIMCMD)

NTDMAGCH (1.)


A50016-G5100-A041-03-7618

23


Id:0900d805801274ef

BTS BSCMS MSC

PHCRQ

PHCCN


DT1 (ASREQ)

CHNAV (TCH)

CHNAK

DATRQ (ASS CMD)

I (ASS CMD)SABM

ESTIN

DATIN (ASS CMP)

Start TTRAU

Start T_MSRFPCI

Stop TTRAU (**)SDCCH

FACCH

DT1 (ASS COM)

I (ASS CMP)FACCH

UAFACCH

MRPCI

Stop T_MSRFPCI


Start T10

Stop T10

DATRQ (TRCMD)I (TRCMD)

I SETUP

I (TRCMP)

DT1 (SETUP)DATIN (SETUP)

DATIN (TRCMP) DT1 (TRCMP)I CCONF DATRQ (CCONF) DT1 (CCONF)

SDCCH

SDCCH

SDCCH

SDCCH

DT1 (TRCMD)




24 A50016-G5100-A041-03-7618


Id:0900d805801274ef


FACCHI (ALERT)

BSCMS BTS MSC

DATRO (ALERT) DT1 (ALERT)



(**)

RELRQ

RCHRL (SDCCH)RCHRA

RELCN


A50016-G5100-A041-03-7618

25


Id:0900d805801274ef

2.6 Successful Mobile Terminating Call (MTC) in busy mode, new waiting call (feature Call waiting) is accepted by called subscriber

called subscriber accepts new cell and releases the old one by the pressing the appropriate keys on the MS

DATIN (SPDACK)

DATIN (STDACK)

DATRQ (SPDTMF)

DATRQ (STDTMF) DT1 (STDTMF)

DT1 (STDACK)

DT1 (SPDTMF)

DT1 (SPDACK)

FACCH

BTS MSCMS BSC

(cause: user busy

I (SPDACK) FACCH

I (SPDTMF)

I (STDACK)FACCH

I (STDTMF)FACCH

SDCCH

SDCCH

new call for a busy subscriber arrives at MS

DT1 (ALERT)

DATIN (SETUP)

DATRQ (CONNECT)

I (ALERT)


DATRQ (ALERT)

DATIN (CONACK) DT1 (CONACK)

FACCH

I (CONNECT)FACCH

FACCH

DATRQ (ALERT)*

FACCH


I (ALERT)*

I (CCONF)*I SETUP)*

DT1 (SETUP)*

DT1 (ALERT)*

DT1 (CCONF)*

I (CONACK)

DT1 (CONNECT)

DATRQ (CCONF)*


26 A50016-G5100-A041-03-7618


Id:0900d805801274ef


BTS BSCMS MSCI (DISC)

FACCH (cause: normal call clearing)

I (RELEAS)FACCH

I (RELCMP)FACCH

I (CONNECT)*FACCH

I (CONACK)*FACCH

DATIN (DISC)

DATIN (RELEAS)

DATIN (REL CMP)

DATIN (CONNECT)*

DATIN (CONACK)*

DT1 (DISC)DT1 (RELEAS)

DT1 (REL CMP)

DT1 (CONNECT)*

DT1 (CONACK)*

(cause: normal call clearing)

Conversation phase of new accepted call ...

Messages related to new waiting and accepted call.(*)

A50016-G5100-A041-03-7618

27


Id:0900d805801274ef

2.7 Unsuccessful Mobile Originating Call (MOC), Subscriber B Busy, FR Call

BTS BSCMS MSC

DT1 (ASS COM)


I (ASS CMP)DATIN (ASS CMP)

MRPCI

RELRQ

Call setup ... (see Successful MOC)

Call release ... (see Normal call release, originated by network)

RCHRL (SDCCH)RELCN

DT1 (DISC)

RCHRA

(cause: user busy)

FACCH

I (DISC)SDCCH

DATRQ (DISC)

Stop T_MSRFPCI

Stop T10

ASDCALTI(stop)MBUSYSSP (1.)(accumulation)

28 A50016-G5100-A041-03-7618


Id:0900d805801274ef


2.8 Unsuccessful Mobile Originating Call (MOC), No TCH Available, FR Call

BTS BSCMS MSC

I (SETUP)DATIN (SETUP)

TASSFAIL (8.)

ATTCHSEI (1.)ATCHSMBS (1.)ABISPSUP (7.)TASSATT (2.)

DT1 (SETUP)DT1 (CPROC)DATRQ (CPROC)

I (CPROC) DT1 (ASS REQ)

DT1 (ASS FAI)(cause: no radio resource available)

Call release ... (see Normal call release, originated by network)

DT1 (DISC)(cause: no circuit/channel available)I (DISC)

FACCH

DATRQ (DISC)

SDCCH

SDCCH

Call setup ...

A50016-G5100-A041-03-7618

29


Id:0900d805801274ef

2.9 Successful Mobile Originated Call (MOC) in a Concentric Cell (inner area), FR Call

BTS BSCMS MSC

I (CPROC) DATRQ (CPROC)


ATTCHSEI (1.)If last TCH startAALTCHTI (1.)

DATIN (SETUP)I (SETUP)DT1 (SETUP)DT1 (CPROC)DT1 (ASS REQ)

PAREQ

PAREA

PHCRQ

PHCCN

CHNAV (TCH)

CHNAK

Call setup ...

SDCCH

SDCCH

(preferred area type: inner area)

Start TTRAU

Start T_MSRFPCI

I (ASS CMD)SDCCH

DATRQ (ASS CMD)Stop TTRAU (**)

FACCHSABM

UAFACCH

I (ASS CMP)DATIN (ASS CMP)FACCH

ESTIN

DT1 (ASS COM)

Start T10

Stop T10

TASSATT (2.)

MEBUSTCH [1]MEBUTSLY [FR & LY]MBTCHCHT 1 if FV1, 2 if FV2, 3 if FV3ABISPDIS [1], ABISPSUP [6]


30 A50016-G5100-A041-03-7618


Id:0900d805801274ef


BTS BSCMS MSC

RELCN

ASCALTI (stop)MBUSYSSP(1.)(accumulation)

DT1 (ALERT)

MRPCI

RELRQ

RCHRL (SDCCH)RCHRA



(**)

Stop T_MSRFPCI

DATRQ (ALERT)I (ALERT)FACCH

A50016-G5100-A041-03-7618

31


Id:0900d805801274ef

2.10 Successful Mobile Emergency Call (MEC), FR CallBTS BSCMS MSC

CHNREQ

CHNAV (SDCCH)CHNAK

CR (CL3I; CMSREQ)

NATTSDPENACSUCPR (3.)ATIMASCA (2.)If last SDCCH startASDCALTI

TACCBPRO () (2.)SUIMASCA (2.)NACSUCPR (2.)


CHNRD

IACMD (IMASS)UI (IMASS)

SABM (CMSREQ)ESTIN (CMSREQ)

MRPCI

RACH (request reference: emergency call)

AGCH

SDCCH (CM service type: emergency call establishment)

I (EMSETUP)DATIN (EMSETUP)

DT1 (EMSETUP)

DT1 (CPROC)

SDCCH

Optional: Authentication & Ciphering Procedure (see 2.1)

DATRQ (CPROC)I (CPROC)SDCCH

UASDCCH


DT1 (ASREQ)


Stop T_MSRFPCI

Start T_MSRFPCI

Start T3101

Stop T3101

NTDMAGCH (1.)




32 A50016-G5100-A041-03-7618


Id:0900d805801274ec

Unsuccessful Assignment Procedures

3 Unsuccessful Assignment Procedures

3.1 Unsuccessful TCH Assignment Procedure with Reversion to SDCCH, FR Call

BTS BSCMS MSC

DT1 (ASS REQ)

Start T_MSRFPCI

DT1 (ASS FAIL)

TASSFAIL (7.)

PHCCN

CHNAV (TCH)

CHNAK

DATRQ (ASS CMD)I (ASS CMD)

(cause: radio interface failure,

DT1 (DISC)

Call setup ...

SDCCH

Start TTRAU


(cause: normal, unspecified)

I (ASS FAIL)SDCCH

FACCH

SABM

ESTIN sdcch

PHCRQ

ATTCHSEI (1.)TASSATT (2.)If last TCH startAALTCHTI

Access to target channel fails ...

SABMSDCCH

UA

(Cause: protocolerror unspecified)

DATIN (ASS FAIL)

reversion to old channel)

Start T10

Stop T10

Call release ...

DATRQ (DISC)I (DISC)SDCCH

FACCH

SABM

FACCH

SABM

....

SDCCH

CHALNHLYCHALNHLY[20 (Full V1/V2) or 21(AMR)]If layer is not the preferred oneCHALNHLY[2 or 3]


A50016-G5100-A041-03-7618

33

PM:SBS Message Flows Unsuccessful Assignment Procedures

Id:0900d805801274ec

3.2 Unsuccessful TCH Assignment Procedure with Loss of ASSIGNMENT COMMAND (T10 < T_MSRFPCI), FR Call (T10 Expiry)

3.3 Unsuccessful TCH Assignment Procedure with Loss of

BTS BSCMS MSC

DT1 (ASS REQ)

Start T10

Start T_MSRFPCI

Expiry T10 DT1 (ASS FAI)


TASSFAIL (6.)

PHCRQ

PHCCN

CHNAV (TCH)

CHNAK

DATRQ (ASS CMD)

I (ASS CMD)

(cause: radio interface msg failure)

DT1 (CL CMD)(cause: call control)

Call setup ...

SDCCH

Start TTRAU

Stop TTRAU (**)

Release of resources ...


(**)


ASS CMD islost ...


NRCLRCHD [14]


34 A50016-G5100-A041-03-7618


Id:0900d805801274ec

Unsuccessful Assignment Procedures

ASSIGNMENT COMMAND (T10 > T_MSRFPCI), FR Call (T_MSRFPCI Expiry)

BTS BSCMS MSC

DT1 (ASS REQ)

Start T10

Start T_MSRFPCI

DT1 (CL REQ)


NRFLTCH (4.)

PHCRQ

PHCCN

CHNAV (TCH)

CHNAK

DATRQ (ASS CMD)

I (ASS CMD)

(cause: radio interface msg failure)

DT1 (CL CMD)(cause: radio interface msg failure)

Call setup ...

SDCCH

Start TTRAU

Stop TTRAU (**)


ASS CMD islost ...

Expiry T_MSRFPCI CONFL


(cause: T_MSRFPCI expired)

(**) TTRAU is stopped when the BTS receives the (idle) TRAU frames from the TRAU. This happens when the BSC throughconnects the Asub-TCH to the Abis-TCH. In case of TCH Assignment this is done on transmission of the ASSIGNMENT COMMAND.

NRCLRREQ [3]

NRCLRCMD [1]

A50016-G5100-A041-03-7618

35

PM:SBS Message Flows Unsuccessful Assignment Procedures

Id:0900d805801274ec

3.4 Unsuccessful TCH Assignment Procedure LAPDm I-Frame with ASSIGNMENT COMMAND not acknowledged by MS (T200 Expiry), FR Call

BTS BSCMS MSC

DT1 (ASS REQ)

Start T10

Start T_MSRFPCI

ATTCHSEI (1.)TASSATT (2.)If last TCH startAALTCHTI (1.)PHCRQ

PHCCN

CHNAV (TCH)

CHNAK

DATRQ (ASS CMD)

Call setup ...

Start TTRAU

Stop TTRAU (**)



I (ASS CMD)SDCCH

DT1 (CL REQ)(cause: radio interface msg failure)

DT1 (CL CMD)(cause: radio interface msg failure)

ERRIN(cause: timer T200 expiredN200+1 times))


(**)

NRFLSDCC (1.)

I (ASS CMD)

I (ASS CMD)

I (ASS CMD)

SDCCH

SDCCH

SDCCH

T200 expiredN200+1 times))

T200

T200

T200

NRCLRCMD (13)

NRCLRREQ (21)

36 A50016-G5100-A041-03-7618


Id:0900d805801274e5

Call Release Procedures

4 Call Release Procedures

4.1 Normal Call Release (Originated by MS), FR Call

4.2 Normal Call Release (Originated by Network), FR Call

BTS BSCMS MSC

I (DISC)

DATRQ (RELEAS)

DATIN (REL CMP)

MTCHBUTI (1.) (stop)AALTCHTI (1.) (stop, if previously started)

DATIN (DISC) DT1 (DISC)

DT1 (RELEAS)I (RELEAS)

I (RELCMP)DT1 (REL CMP)

DATRQ (CHREL)

DT1 (CL CMD)

I (CHREL)

DESAC DT1 (CL CMP)

RLSD

RLC

RELIN

RCHRL (TCH)RCHRA


(cause: normal call clearing)FACCH

FACCH

FACCH

FACCH

DISCFACCH

UAFACCH


(cause: call control)

(cause: end user originated)

Start T3110

Stop T3110

Start T3109

Stop T3109

Start T3111

Expiry T3111

NRCLRCMD (2.)

MBTCHCHMEBUSTCH =MEBUTSLY -ABSPDIS -

NCRLBRQU (1., 2.)

A50016-G5100-A041-03-7618

37

PM:SBS Message Flows Call Release Procedures

Id:0900d805801274e5

4.3 Abnormal Call Release Procedure; Call drop: BTS sends CONNECTION FAILURE INDICATION to the BSC

BTS BSCMS MSC

I (DISC)

DATRQ (RELEAS)

DATIN (REL CMP)


DATIN (DISC)

DT1 (DISC)

DT1 (RELEAS)I (RELEAS)

I (RELCMP)DT1 (REL CMP)

DATRQ (CHREL)

DT1 (CL CMD)

I (CHREL)

DESAC

DT1 (CL CMP)

RLSD

RLC

RELIN

RCHRL (TCH)RCHRA


FACCH

FACCH

FACCH

FACCH

DISCFACCH

UAFACCH


(cause: call control)

(cause: end user originated)


Start T3110

Stop T3110

Start T3109

Stop T3109

Start T3111

Expiry T3111

NRCLRCMD (2.)


NCRLBRQU (3., 4.)

38 A50016-G5100-A041-03-7618


Id:0900d805801274e5


BTS BSCMS MSC

CONFL

TTRAU expiry***orTSYNC/TSYNCDL**** expiry

NRFLTCH (7.)or *

NRFLSDCC (7.)

(cause: radio link failure)

Radio link counterin the BTS (RDLNKTBS**)reaches 0

CONFL

Call or dedicated connection (SDCCH or FACCH) established ...

or ...

(cause: remote transcoder failure)NRFLTCH (8.)

or *NRFLSDCC (8.)

T_MSRFPCI expiry*****CONFL

(cause: T_MSRFPCI expired)NRFLTCH (4.)

or *NRFLSDCC (4.)

or ...

A50016-G5100-A041-03-7618

39


Id:0900d805801274e5

BTS BSCMS MSC

DT1 (CL REQ)

RELCN

RCHRA

DT1 (CL CMD)

(cause: radio interface

DT1 (CL CMP)RELRQ

message failure******)

Reset T_MSRFPCI

RCHRL (New TCH) or SDCCH

MS-BTS distance exceeds the threshold EXCDIST

CONFL(cause: distance limit exceeded******)

NRFLTCH (5.)or *

NRFLSDCC (5.)

or ...

NRCLRCMD (1.)

NRCLRREQ (3.)or

NRCLRREQ (6.)******

If TCHMTCHBUTI (1.) (stop)AALTCHTI (1.) (stop, if previously started)MBTCHCHMEBUSTCH =MEBUTSLY -ABSPDIS -

If SDCCHMBUSYSDC -ASDCALTI (stop, if previously started)

A

B

40 A50016-G5100-A041-03-7618


Id:0900d805801274e5


4.4 Abnormal Call Release Procedure; Call drop: BTS sends ERROR INDICATION to the BSC

If the CONNECTION FAILURE INDICATION is received a TCH, NRFLTCH is triggered; if it is received for an SDCCH, NRFLSDCC is triggered.

RDLNKTBS is the initial value of the 'S' Counter. This counter in the BTS is decreased by '1' if the BTS cannot decode a SACCH frame correctly. When the BTs can decode a SACCH frame again, RDLNKTBS is increased by '2'. If the counter reaches '0', the Um connection is regarded as lost.

TTRAU is started in the BTS on receipt of the CHANNEL ACTIVATION message for a TCH. Its purpose is to observe the receipt of TRAU frames from the TRAU after the activation of the TCH, i.e. it is stopped when TRAU frames are received.

TSYNC is started in the BTS when the BTS does not receive valid TRAU frames for an activated TCH anymore. Its purpose is to observe the re-appearance of TRAU frames from the TRAU, i.e. it is stopped again when TRAU frames are received. TSYNC is used for FR, HR and EFR speech calls and for standard dataservices (up to 9,6 kbit/s). For AMR calls and 14,4 kbit/s dataservices TSYNC is replaced by TSYNCDL.

T_MSRFPCI is started in the BTS on receipt of the CHANNEL ACTIVATION ACKNOWLEDGE message for a TCH. Its purpose is to observe the receipt of the MPRCI message, i.e. it is stopped when the MRPCI message is received. The BSC sends this message when the MS has successfully sent the first layer 3 message on a new channel during call setup (CM SERVICE REQUEST (for the SDCCH) and ASSIGNMENT COMPLETE) and handover (ASSIGNMENT COMPLETE (intracell HO) and HANDOVER COMPLETE (inter-cell handover)). As T_MSRFPCI is hardcoded to a very long value (20s), this timer should never expire under normal conditions and reasonable timer settings.

When the BSC receives a CONNECTION FAILURE INDICATION with cause distance limit exceeded, the cause value contained in the CLEAR REQUEST message will not be radio interface message failure but distance. Consequently also the corresponding NRCLRREQ subcounter (6.) is triggered instead of subcounter (3.).

If the CONN_FAIL is received on TCH, the corresponding subcounter is NRCLRREQ 3 or 6 (see note above); on the contrary if it is received on SDCCH, the corresponding subcounter is NRCLRREQ 21 or 24.

NRCLRCMD (1) if CONN_FAIL is received on TCHNRCLRCMD (13) if CONN_FAIL is received on SDCCH

(*)

(***)

(****)

(*****)

(**)

(******)

A

B

A50016-G5100-A041-03-7618

41


Id:0900d805801274e5

BTS BSCMS MSC

ERRIN

NRFLTCH (1.)or *

NRFLSDCC (1.)

(cause: timer T200 expiredN200+1 times)

BTS has sent a Um layer 2 (LAPDm) message in acknowledged mode N200+1 times to the MS without receiving an appropriate layer 2 acknowledgement.

Call or dedicated connection (SDCCH or FACCH) established ...

NRFLTCH (2.)or *

NRFLSDCC (2.)

MS has sent a Um layer 2 (LAPDm) message DM (Mode) to the BTS while the BTS-MS communication is in multiple frame stablished state

ERRIN(cause: unsolicited DM response, multiple frame established state)

DMFACCH or SDCCH

or...

RELIN**

RELIN**

42 A50016-G5100-A041-03-7618


Id:0900d805801274e5


BTS BSCMS MSC

DT1 (CL REQ)

RCHRA

DT1 (CL CMD)

(cause: radio interface

DT1 (CL CMP)

message failure)

Reset T_MSRFPCI

RCHRL (New TCH)

NRFLTCH (3.)or *

NRFLSDCC (3.)

If the ERROR INDICATION is received for a TCH, NRFLTCH is triggered; if it is received for a SDCCH, NRFLSDCC is triggered.

(*)

ERRIN(cause: sequence error)

BTS has detected irregularities in the Um layer 2 (LAPDm) flow control functions (wrong message sequence) useds in acknowledged mode

or ...

NRCLRCMD (1.)

NRCLRREQ (3.)

RELIN**

The RELEASE INDICATION is always sent directly after the ERROR INDICATION to indicate that the layer 2 context on the Um interface has already been cleared by the BTS.

(**)

3 if TCH21 if SDCCH

13 if SDCCH1 if TCH

If TCHMTCHBUTI (1.) (stop)AALTCHTI (1.) (stop, if previously started)MBTCHCHMEBUSTCH =MEBUTSLY -ABSPDIS -

If SDCCHMBUSYSDC -ASDCALTI (stop, if previously started)

A50016-G5100-A041-03-7618

43


Id:0900d805801274e5

4.5 Abnormal Call Release; BTS sends RELEASE INDICATION during a stable call phase to the BSC, FR Call

BTS BSCMS MSC

DT1 (CL REQ)

DT1 (CL CMD)

(cause: radio interface failure)

RELIN

Due to MS-internal irregularities, the MS disconnects the layer 2 on the Um interface.

Call or dedicated TCH connection in a stable phase ...

NRCLRCMD (1.)

NRCLRREQ (2.)

DISC

RELCN

RCHRA

RELRQ

Reset T_MSRFPCI

RCHRL (New TCH)



44 A50016-G5100-A041-03-7618


Id:0900d805801274e3

Inter-Cell Handover, Intra-BSC

5 Inter-Cell Handover, Intra-BSC

5.1 Successful Inter-Cell Handover, Intra-BSC, FR Call

BTSold BTSnew BSCMS MSC

CHNAK

CHNAV (New TCH)

I (HO CMD)


Start T8

HANDO Start T3124

Stop T3124Start T3105


Start THORQST

Start TTRAU

Stop TTRAU (**)

Start T_MSRFPCI

UI (MEAS REP)

HO ACCESS (***)

UI (PHYS INFO)

SACCH

HO ACCESS (***)

UI (MEAS REP)SACCH

UI (MEAS REP)SACCH

FACCH

FACCH

FACCH

FACCH

(with HO cause)BWHCI

DATRQ (HO CMD)

AININIRH (*)AOUINIRH (*)

Stop T3105ESTIN (new TCH)

SABM

UA

FACCH

FACCHTNTCHCL (1.)

Call in progress ...


MEBUSTCH [1]MEBUTSLY [FR & LY]MBTCHCHT 1 if FV1, 2 if FV2, 3 if FV3ATINHIRC (*)

A50016-G5100-A041-03-7618

45

PM:SBS Message Flows Inter-Cell Handover, Intra-BSC

Id:0900d805801274e3


MRPCI

Stop T8

DATIN (HO CMP)

SUCTCHSE (1.)

DT1 (HOPER)

SINTHINT (*)SININIRH (*)SOUINIRH (*)SINHOBSC (*)

Note: Subcounter depends on the handover cause value contained in the HANDOVER CONDITION INDICATION.

TTRAU is stopped when the BTS receives the (idle) TRAU frames from the TRAU. This happens when the BSC throughconnects the Asub-TCH to the Abis-TCH. In case of intra-BSC handover this is done after receipt of the HANDOVER DETECT message.

(**)

(*)

Stop T_MSRFPCI (with HO cause)

RELRQ

RELCN

RCHRL (Old TCH)RCHRA

I (HO CMP)FACCH

Call continuation ...



HO ACCESS is transmitted exactly 4 times, the MS does not wait for any response from the BTS but directly sets up the layer 2 connection (using the SABM) after the last HO ACCESS.

(***)

46 A50016-G5100-A041-03-7618


Id:0900d805801274e3


5.2 Unsuccessful Inter-Cell Handover Attempt, Intra-BSC, No TCH Available in Target Cell, FR Call


. .

UI (MEAS REP)SACCH

UI (MEAS REP)SACCH

UI (MEAS REP)SACCH

Note: Subcounter depends on the handover cause value contained in the HANDOVER CONDITON INDICATION. When the BSC receives an INTERCELL HANDOVER CONDITION INDICATION for a TCH with a val-id target cell, it first checks the administrative state (locked/unlocked/shutting down) and the availability state (enabled/disabled) of the target BTS objects. Moreover, if the INTERCELL HANDOVER CONDI-TION INDICATION contains the cause "traffic", it checks the TCH load situation with respect to the threshold TRFLTH.Only if the BSC finds one target BTS in state "unlocked/enabled" and (in case of traffic handover) with a TCH load below the TRFLTH threshold, the BSC starts to search for an available TCH in the "idle list" of the target cell. Only in this case the measurements ATINHIRC (for the originating BTS) and ATTCHSEI (for the target BTS) are triggered. If no TCH at Um interface can be found due to TCH congestion, no suitable Abis sunchannel at Abis Interface are free, the TRXs are in "locked" state or/and the CHAN objects are in "locked" state in the target BTS, the ATCHSMBS is triggered for the target BTS in addition and the next target cell is analyzed.If no target BTS in state "unlocked/enabled" or (in case of traffic handover) no target cell with the TCH load below the threshold TRFLTH can be found, NHOINRHA is triggered. In this case neither ATINHIRC nor ATTCHSEI nor ATCHSMBS are increased.Also CHALHNLY is triggered: 20 [if full V1/V2] and 11. Also 21 [if AMR] and 12.

(*)

BWHCI

(with HO cause)

ATTCHSEI (1.)(**)(***)ATCHSMBS (1.)(**)(***)ATINHIRC (*)(**)(***)NHOINRHA (3.)(**)

BWHCI(with HO cause)

Start THORQST

Expiry THORQST



(**)


(***)

A50016-G5100-A041-03-7618

47


Id:0900d805801274e3

5.3 Unsuccessful Inter-Cell Handover, Intra-BSC, with Rever-sion to Old TCH (T3124 Expiry), FR Call


CHNAK

CHNAV (New TCH)

I (HO CMD)


Start T8

AININIRH (*)AOUINIRH (*)Start T3124

Expiry T3124

ATTCHSEI (1.)ATINHIRC (*)If last TCH startAALTCHTI (1.)

Start THORQST

Start TTRAU

Start T_MSRFPCI

UI (MEAS REP)

HO ACCESS

SACCH

DATRQ (HO CMD)


HO ACCESS

UI (MEAS REP)SACCH

UI (MEAS REP)SACCH

FACCH

FACCH

FACCH

HO ACCESSdoes not getthrough***

SABM

UAFACCH

FACCH

ESTIN [old TCH]

HO ACCESSFACCH

Stop T8

HOFITABSUNINHOIE (*)

I (HO FAIL)FACCH DATIN (HO FAIL)

(cause: protocol error, unspecified**)




48 A50016-G5100-A041-03-7618


Id:0900d805801274e3



RCHRL (New TCH)

MTCHBUTI (1.) (stop)AALTCHTI (1.) (stop)


(*)

Reset T_MSRFPCI

RCHRA

Reset TTRAU


(**) The actual cause value used by the MS might differ from the one indicated in the message flow - other cause values such as "abnormal release, timer expired" or "abnormal release, unspecified" etc. might be used.

The handover might not only fail due to the fact that no PHYSICAL INFORMATION is received after transmission of the HAN-DOVER ACCESS on the target channel. The MS can still return to the old channel after it has received the PHYSICAL INFOR-MATION from the BTS. This happens when the layer 2 connection setup fails, i.e. when the MS does not receive any UA after repeated transmission of the SABM on the target channel.

(****)


A50016-G5100-A041-03-7618

49


Id:0900d805801274e3

5.4 Unsuccessful Inter-Cell Handover, Intra-BSC, with Loss of MS (Loss of HO CMD, T8

50 A50016-G5100-A041-03-7618


Id:0900d805801274e3


5.5 Unsuccessful Inter-Cell Handover, Intra-BSC with Loss of MS (Loss of HO CMD, T8>TTRAU), FR Call (TTRAU Expiry)




(*)

Reset T_MSRFPCI

Reset TTRAU

RCHRA

RLSD

RCHRL (New TCH)RLC

Call release ...


A

Note: These subcounters are triggered both for the new and old channel's release.A

A50016-G5100-A041-03-7618

51


Id:0900d805801274e3


CHNAK

CHNAV (New TCH)

I (HO CMD)


Start T8



Start THORQST

Start TTRAU

Start T_MSRFPCI

UI (MEAS REP)SACCH

DATRQ (HO CMD)


UI (MEAS REP)SACCH

UI (MEAS REP)SACCH

FACCH

NRFLTCH (8.)

HO CMD islost ...

DT1 (CL REQ)(cause: radio interfacemessage failure)

DT1 (CL CMD)

Expiry TTRAU CONFL(Cause: remote transcoder failure)

DT1 (CL CMP)


NRCLRCMD (1.)

NRCLRREQ (3.)



52 A50016-G5100-A041-03-7618


Id:0900d805801274e3





(*)

RELRQ

RELCN

RCHRA

RCHRL (New TCH)


RLSD

RLC

Reset T_MSRFPCIMBTCHCHMEBUSTCH =MEBUTSLY -ABSPDIS -

A


A50016-G5100-A041-03-7618

53


Id:0900d805801274e3

5.6 Unsuccessful Inter-Cell Handover, Intra-BSC, with Loss of MS, Handover Access Failure (No SABM after Transmis-sion of PHYSICAL INFO, [(NY1+1) * T3105]

54 A50016-G5100-A041-03-7618


Id:0900d805801274e3




(*)

RELRQ

RELCN

RCHRA

RCHRL (New TCH)


RLSD

RLC

NRFLTCH (6.)DT1 (CL REQ)(cause: radio interfacemessage failure)

DT1 (CL CMD)

CONFL(cause: HO access failure)

DT1 (CL CMP)

Start T3105FACCH

UI (PHYS INFO)

Note: T3105 expires (NY1+1) times.(***)

MS does not react to PHYS INFO, no SABM is received at the BTS.

Expiry T3105 (***)

Expiry T3105

NRCLRCMD (1.)

NRCLRREQ (3.)




A

A50016-G5100-A041-03-7618

55


Id:0900d805801274e3

5.7 Successful Inter-Cell Handover (Intra-BSC) between Colo-cated Concentric Cells, FR Call


CHNAK

CHNAV (New TCH)

I (HO CMD)


Start T8


HANDO Start T3124


Start TTRAU

Stop TTRAU (**)

Start T_MSRFPCI

UI (MEAS REP)SACCH

DATRQ (HO CMD)


HO ACCESS

UI (MEAS REP)SACCH

UI (MEAS REP)SACCH

FACCH

FACCH

Stop T3124Start T3105

UI (PHYS INFO)FACCH

Stop T3105ESTIN new TCH

TNTCHCL (1. for concentric cells)

SABM

UA

FACCH

FACCH


PAREAPAREQ



56 A50016-G5100-A041-03-7618


Id:0900d805801274e3



MRPCI

Stop T8

DATIN (HO CMP)

SUCTCHSE (1.)DT1 (HOPER)




(**)

(*)

Stop T_MSRFPCI (with HO cause)RELRQ

RELCN


I (HO CMP)FACCH




A50016-G5100-A041-03-7618

57


Id:0900d805801274e3

5.8 Successful Inter-Cell Handover, Intra-BTSE, Between Syn-chronized Cells, FR Call


CHNAK

CHNAV (New TCH)

I (HO CMD)

MTCHBUTI (1.)(start)

Start T8


HANDO

Start THORQST

Start TTRAU

Stop TTRAU (**)

Start T_MSRFPCI

UI (MEAS REP)

HO ACCESS (***)

SACCH

DATRQ (HO CMD)


HO ACCESS (***)

UI (MEAS REP)SACCH

UI (MEAS REP)SACCH

FACCH

FACCH

FACCH

(Activation type: related to synchronous handover)

(Synchronization Indicator: synchronized)

HO ACCESS (***)FACCH

HO ACCESS (***)FACCH

ESTIN (new TCH)SABM

UAFACCH

FACCH TNTCHCL (1.)

Stop T8

DATIN (HO CMP)


I (HO CMP)FACCH





58 A50016-G5100-A041-03-7618


Id:0900d805801274e3



MRPCI

SUCTCHSE (1.)

DT1 (HOPER)

Note: Subcounter depends on the handover cause value contained in the BWHCI.


(**)(*)

Stop T_MSRFPCI

(with HO cause)

RELRQ

RELCN



HO ACCESS is transmitted exactly 4 times, the MS does not wait for any response from the BTS but directly sets up the layer 2 connection (using the SABM) after the last HO ACCESS.

(***)



A50016-G5100-A041-03-7618

59


Id:0900d805801274e3

5.9 Successful Inter-Cell Handover, Intra-BSC, MSC Con-trolled, FR Call

CHNAK

DT1 (HO RQD)

UI (MEAS REP)SACCH

UI (MEAS REP)SACCH

UI (MEAS REP)SACCH

CR (HO REQ)

I (HO CMD)FACCH

CHNAV (New TCH)

HANDO



Start THORQSTBWHCI

(with HO cause)

Start T7

MTCHBUTI (1.) (start)Start TTRAU (**)

Start T_MSRFPCI CC (HO RAC; HO CMD)

AOUINIRH (*)AININIRH (*)

Stop T7

DATRQ (HO CMD)Start T8

HO ACCESS

Stop TTRAU (**)

Start T3124

DT1 (HO CMD; HO CMD) (***)

ATTCHSEI (1.)if last TCH startAALTCHTI (1.)

FACCH



60 A50016-G5100-A041-03-7618


Id:0900d805801274e3


ESTIN new TCH

DATIN (HO CMP)

MRPCI

DT1 (HO CMP)

DT1 (CL CMP)

DT1 (CL CMD)

Note: Subcounter depends on the handover cause value contained in the HANDOVER CONDITION INDICATION.TTRAU is stopped when the BTS receives the (idle) TRAU frames from the TRAU. This happens when the BSC throughconnects the Asub-TCH to the Abis-TCH. In case of MSC-controlled handover this is done on the CHANNEL ACTIVATION ACKNOWLEDGE for the TCH in the target BTS.

(**)

(*)

FACCH

FACCH

(cause: handover successful)

HANDOVER COMMAND t i th BCCH d BSIC f f i t l i hb ll(***)


Stop T3124

PHYS INFO

Start T3105

Stop T3105

SABM

TNTCHCL (1.)I (HO CMP)

UA

SUCTCHSE (1.)

Stop T8

SOUINIRH (*)SININIRH (*)NRCLRCMD (3.)

RELRQ

RELCN

RCHRL (Old TCH)

RCHRA

Stop T_MSRFPCI

FACCH

FACCH




A50016-G5100-A041-03-7618

61


Id:0900d805801274e3

5.10 Successful SDCCH-SDCCH Inter-Cell Handover, Intra-BSC


CHNAK

CHNAV (New SDCCH)

I (HO CMD) Start T8

HANDO Start T3124

Stop T3124 Start T3105

NATTSDPEATINHIRC (*)If last SDCCH startASDCALTI

Start THORQST

Start T_MSRFPCI

UI (MEAS REP)

HO ACCESS

UI (PHYS INFO)

SACCH

HO ACCESS

UI (MEAS REP)SACCH

UI (MEAS REP)SACCH

SDCCH

SDCCH

SDCCH

SDCCH

(with HO cause)BWHCI

DATRQ (HO CMD)

AININIRH (*)AOUINIRH (*)AISHINTE

Stop T3105ESTIN new SDCCH

SABM

UA

SDCCH

SDCCH

SDCCH transaction or call in SDCCH phase in progress ...

Stop T8

DATIN (HO CMP)

SINTHINT (*)SININIRH (*)SOUINIRH (*)SISHINTE SINHOBSC (*)

I (HO CMP)FACCH


62 A50016-G5100-A041-03-7618


Id:0900d805801274e3



MRPCI

ASDCALTI (stop)MBUSYSD -MBUSYSSP [4] (accumulation) (**)

NASUSDPE

DT1 (HOPER)


(*)

Stop T_MSRFPCI (with HO cause)

RELRQ

RELCN

RCHRL (Old SDCCH)RCHRA


Note: Subcounter of MBUSYSSP depends on type of original SDCCH transaction at call setup.(**)

A50016-G5100-A041-03-7618

63


Id:0900d805801274e3

5.11 Unsuccessful SDCCH-SDCCH Inter-Cell Handover Attempt, Intra-BSC, No SDCCH Available in Target Cell


UI (MEAS REP)SACCH

UI (MEAS REP)SACCH

UI (MEAS REP)SACCH

Note: Subcounter depends on the handover cause value contained in the HANDOVER CONDITON INDICATION.When the BSC receives an INTERCELL HANDOVER CONDITION INDICATION for and SDCCH-SDCCH handover with a valid target cell, it first checks the administrative state (locked/unlocked/shutting down) and the availability state (enabled/disabled) of the target BTS objects. Only if the BSC finds one target BTS in state "unlocked/enabled", the BSC starts to search for an available SDCCH in the "idle list" of the target cell. Only in this case the measurements ATINHIRC (for the originating BTS) and NATTSDPE (for the target BTS) are triggered. If no SDCCH can be found due to SDCCH congestion, "locked" state of the TRXs or/and "locked" state of the CHAN objects in the target BTS, ATSDCMBS is triggered for the target BTS in addition and the next target cell is analyzed. If no target BTS in state "unlocked/enabled" can be found, NHOINRHA is triggered. In this case neither ATINHIRC nor NATTSDPE nor ATSDCMBS are increased.CHALNHLY [19] total requestCHALNHLY [1] not served

(*)


NATTSDPE (**) (***)ATSDCMBS (**) (***)ATINHIRC (*)(**) (***)NHOINRHA (3.)(**)


Start THORQST

Expiry THORQST



(**)

NATTSDPE (**) (***)ATSDCMBS (**) (***)ATINHIRC (*)(**) (***)NHOINRHA (3.)(**)

(***)

64 A50016-G5100-A041-03-7618


Id:0900d805801274e3


5.12 Unsuccessful SDCCH-SDCCH Inter-Cell Handover, Intra-BSC, with Loss of MS (Loss of HO CMD, T8 Expiry)

BTSold

BTSnew

BSCMS MSC

CHNAK

CHNAV (New SDCCH)

I (HO CMD)Start T8

AININIRH (*)AOUINIRH (*)AISHINTE

NATTSDPEATINHIRC (*)If last SDCCH startASDCALTI

Start THORQST

Start T_MSRFPCI

UI (MEAS REP)SACCH

DATRQ (HO CMD)


UI (MEAS REP)SACCH

UI (MEAS REP)SACCH

SDCCH

Expiry T8

UNIHIRLCUISHIRLC

HO CMD islost ...

DT1 (CL REQ)(cause: radio interfacemessage failure)

DT1 (CL CMD)

DT1 (CL CMP)RELCN

RELRQ

RCHRL (Old SDCCH)RCHRA


NRCLRCMD (13.)

NRCLRREQ (21.)


A50016-G5100-A041-03-7618

65


Id:0900d805801274e3


ASDCALTI (stop) (*)MBUSYSD - dec for 2 sd-cch


(*)

Reset T_MSRFPCI

RCHRA

RLSD

RCHRL (New SDCCH)RLC

66 A50016-G5100-A041-03-7618


Id:0900d805801b670e

Inter-Cell Handover, Inter-BSC

6 Inter-Cell Handover, Inter-BSC

6.1 Successful Inter-Cell Handover, Inter-BSC, FR CallBTSold BTSnewMS

CHNAK

Start T7

Start T3124

HO ACCESS

DT1 (HO DET)

I (HO CMD)

HANDO

Stop T7

BSCnewBSCold MSC

ATINBHDO (*)

DT1 (HO RQD)CR (HO REQ)

DATRQ (HO CMD)

UI (MEAS REP)SACCH


UI (MEAS REP)SACCH

UI (MEAS REP)SACCH

Start THORQST

Start TTRAU

Start T_MSRFPCI



Stop TTRAU (**)

CC (HO RAC; HO CMD)DT1 (HO CMD; HO CMD)

Start T8FACCH

FACCH

HO ACCESSFACCH

Start Trr7 (***)

CHNAV (New TCH)

UI (PHYS INFO)Stop T3124 Start T3105

FACCH




A50016-G5100-A041-03-7618

67

PM:SBS Message Flows Inter-Cell Handover, Inter-BSC

Id:0900d805801b670e

BTSold BTSnewMS

I (HO CMP)DATIN (HO CMP)

MRPCI

DT1 (HO CMP)

RELRQ

DT1 (CL CMD)Stop T8

SUINBHDO (*)NRCLRCMD (3.)

BSCnewBSCold MSC

DT1 (CL CMP)RELCN

RCHRA

RLSD

SUCTCHSE (1.)

Note: Subcounter depends on the handover cause value contained in the HANDOVER CONDITION INDICATION.TTRAU is stopped when the BTS receives the (idle) TRAU frames from the TRAU. This happens when the BSC throughconnects the Asub-TCH to the Abis-TCH. In case of inter-BSC handover this is done on the CHANNEL ACTIVATION ACKNOWLEDGE for the TCH in the target BTS.

(**)

(*)

(cause: handover successful)

FACCH

Stop T_MSRFPCI

SABM

Stop T3105

TNTCHCL (1.)

ESTIN

UAFACCH

FACCH

Trr7 is an MSC timer which supervises the receipt of a HO CMP after transmission of a HO CMD.(***)

Stop Trr7 (***)

RLC

RCHRL (Old TCH)




68 A50016-G5100-A041-03-7618


Id:0900d805801b670e


6.2 Unsuccsessful Inter-Cell Handover, Inter-BSC, No TCH Available in Target Cell, FR Call

BTSold BTSnewMS BSCnewBSCold MSC

Start T7


UI (MEAS REP)SACCH


UI (MEAS REP)SACCH

UI (MEAS REP)SACCH

Start THORQST

(cause: no radio resource available)

CREF (HO FAI)

DT1 (HO RRJ)

Expiry T7



NHOINRHA (2.)*

NRINHDFL(cause: no radio resource available)

Note: Subcounter (2.) of the measurement NHOINRHA is triggered when the administrable BSSMAP timer T7 (database parameter name BSCT7) expires; with suitable settings of BSCT7 this happens after the receipt of a HANDOVER REQUIRED REJECT message from the MSC. This means that the timer T7 must be set appropriately (e.g. BSCT7=HLFSEC-6) to ensure that NHOINRHA (2.) counts correctly in case of Inter-BSC handover.If - by chance - the call is released before T7 expires, NHOINRHA (2.) is not triggered.

(*)

(**) ATTCHSEI and ATCHSMBS are only triggered if the target BTS indicated in the HO REQ message is in state unlocked/enabled. In current BR9.0 Release, the ATCHSMBS measurement is extended by additional subcounters for blocked TCH seizures due to lack of free Abis subchannels.Also CHALHNLY is triggered: 20 [if full V1/V2] and 11. Also 21 [if AMR] and 12.


(***)

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6.3 Unsuccessful Inter-Cell Handover, Inter-BSC, with Rever-sion to Old TCH, FR Call (T3124 Expiry)


CHNAK

Start T7

Start T3124

HO ACCESS

I (HO CMD)

Stop T7

ATINBHDO (*)


DATRQ (HO CMD)

UI (MEAS REP)SACCH


UI (MEAS REP)SACCH

UI (MEAS REP)SACCH

Start THORQST



CC (HO RAC; HO CMD)DT1 (HO CMD; HO CMD)

Start T8FACCH

FACCH

HO ACCESSFACCH

HO ACCESSdoes not getthrough*****

Start TTRAU

Start T_MSRFPCI

Stop TTRAU (**)Start Trr7 (***)

CHNAV (New TCH)

SABMESTINFACCH

Expiry T3124




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DT1 (HO FAI)

NRUNINHD

DT1 (CL CMD)

RLSD

RCHRA

RLC

Note: Subcounter depends on the handover cause value contained in the HANDOVER CONDITION INDICATION.TTRAU is stopped when the BTS receives the (idle) TRAU frames from the TRAU. This happens when the BSC throughconnects the Asub-TCH to the Abis-TCH. In case of inter-BSC handover this is done on the CHANNEL ACTIVATION ACKNOWLEDGE for the TCH in the target BTS.

(**)

(*)

UA

I (HO FAIL)DATIN (HO FAIL)

Stop T8

FACCH

FACCH (cause:protocol error unspecified****)

(cause: equipment failure)

Trr7 is an MSC timer which supervises the receipt of a HO CMP after transmission of a HO CMD.(***)

RCHRL (New TCH)


Reset T_MSRFPCI

Stop Trr7 (***)

(cause: radio interface fail-ure, reversion to old channel)

(****) The actual cause value used by the MS might differ from the one indicated in the message flow - other cause values such as "abnormal release, timer expired" or "abnormal release, unspecified" etc. might be used.

The handover might not only fail due to the fact that no PHYSICAL INFORMATION is received after transmission of the HAN-DOVER ACCESS on the target channel. The MS can still return to the old channel after it has received the PHYSICAL INFOR-MATION from the BTS. This happens when the layer 2 connection setup fails, i.e. when the MS does not receive any UA after repeated transmission of the SABM on the target channel.

(*****)

NRCLRCMD (4.)

DT1 (CL CMP)



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6.4 Unsuccessful Inter-Cell Handover, Inter-BSC with Loss of MS (Loss of HO CMD, T8

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6.5 Unsuccessful Inter-Cell Handover, Inter-BSC with Loss of MS (Loss of HO CMD, T8>Trr7), FR Call (Trr7 Expiry)

BTSold BTSnewMSDT1 (CL CMD)

BSCnewBSCold MSC

DT1 (CL CMP)

RLSD

RLC

TTRAU is stopped when the BTS receives the (idle) TRAU frames from the TRAU. This happens when the BSC throughconnects the Asub-TCH to the Abis-TCH. In case of inter-BSC handover this is done on the CHANNEL ACTIVATION ACKNOWLEDGE for the TCH in the target BTS.

(**)

DATRQ (CHREL)DESAC

RELIN

RCHRA

Expiry Trr7 (***)DT1 (CL CMD) NRCLRCMD [4]

DT1 (CL CMP)

RLSD

RCHRA

RLC


Trr7 is an MSC timer which supervises the receipt of a HO CMP after transmission of a HO CMD. Its value is hardcoded to 15 sec..

(***)


(*)

RCHRL (New TCH)

RCHRL (Old TCH)

Reset T_MSRFPCI

NRCLRCMD (1.)





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BTSold BTSnewMS

CHNAK

Start T7

Stop T7

BSCnewBSCold MSC


DATRQ (HO CMD)

UI (MEAS REP)SACCH


UI (MEAS REP)SACCH

UI (MEAS REP)SACCH

Start THORQST

Start TTRAU

Start T_MSRFPCI



Stop TTRAU (**)

CC (HO RAC; HO CMD)DT1 (HO CMD)

Start T8

HO CMD islost ...

Start Trr7 (***)

Reset T8

DT1 (CL CMD)(cause: call control)

Expiry Trr7

DT1 (CL CMP)

DT1 (CL CMD)

DT1 (CL CMP)


ATINBHDO (*)

I (HO CMD)FACCH

CHNAV (New TCH)

Documents

SBS Message Flows_A50016-G5100-A041-03-7618