A Interface Cause Codes

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DESCRIPTION 1/1551-CRT 1/1551-CRT 240 240 09 09 Uen Uen BB

A-Interface Cause Codes

A-Interface Cause Codes

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Contents

Contents

1 1 GGeenneerraall 1 1..11 RReevviissiioon n IInnffoorrmmaattiioonn 1 1..22 IInnttrroodduuccttiioonn 2 2 MMeessssaaggees s SSeennt t ffrroom m tthhe e BBSSCC 2 2..11 CClleeaar r RReeqquueesstt 3 3 GGlloossssaarryy 4 4 RReeffeerreenncce e LLiisstt

1

1

General

General

1.1

1.1

Revision Information

Revision Information

This document is based upon 1/1551-CRT 240 09, revision A. This document is based upon 1/1551-CRT 240 09, revision A. The document is changed as below:

The document is changed as below:

 More detailed explanation that statistic counters for droppedMore detailed explanation that statistic counters for dropped

connections are not stepped according to cause value, is added in

connections are not stepped according to cause value, is added in SectionSection

2.1.1

2.1.1..

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1.2

1.2

Introduction

Introduction

In some 48.008 messages sent between the BSC and the MSC the Information In some 48.008 messages sent between the BSC and the MSC the Information Element (IE) Cause is included (see

Element (IE) Cause is included (see Reference [1]Reference [1]). The purpose of the IE is to). The purpose of the IE is to explain to the receiving node why a message is sent. It can be an order

explain to the receiving node why a message is sent. It can be an order to act onto act on a connection or a resource, or it can be to explain why a given orde

a connection or a resource, or it can be to explain why a given orde r could not ber could not be executed.

executed.

In this document the values of IE Cause of message CLEAR REQUEST is In this document the values of IE Cause of message CLEAR REQUEST is described. In

described. In Section 2.1.1Section 2.1.1 the relation between CLthe relation between CLEAR REQUEST and statisticEAR REQUEST and statistic counters is also described.

counters is also described.

2

2

Messages Sent from the BSC

Messages Sent from the BSC

2.1

2.1

Clear Request

Clear Request

2.1.1

2.1.1 GeneralGeneral

The CLEAR REQUEST message is sent to the MSC when BSS has detected a fault The CLEAR REQUEST message is sent to the MSC when BSS has detected a fault that severely affects the connection. The message

that severely affects the connection. The message contains the IE Cause thatcontains the IE Cause that indicates the reason for the release.

indicates the reason for the release.

When CLEAR REQUEST is sent to the MSC, at least one statistic counter is When CLEAR REQUEST is sent to the MSC, at least one statistic counter is stepped indicating that a connection is dropped. The counters for dropped calls stepped indicating that a connection is dropped. The counters for dropped calls are not related to the cause value sent in the CLEAR REQUEST message. Which are not related to the cause value sent in the CLEAR REQUEST message. Which counter to be stepped is only decided according to type of channel, channel rate counter to be stepped is only decided according to type of channel, channel rate and subcell. Additional statistic counters are stepped

and subcell. Additional statistic counters are stepped if urgency state applies.if urgency state applies. Independent of cause value the BSC checks if urgency state is indicated for the Independent of cause value the BSC checks if urgency state is indicated for the dropped connection. If urgency

dropped connection. If urgency state is indicated, some counter indicatingstate is indicated, some counter indicating urgency condition is stepped. Which counter depends on the type of urgency urgency condition is stepped. Which counter depends on the type of urgency state, type of channel and channel rate (see

state, type of channel and channel rate (see Reference [2]Reference [2]).). 2.1.2

2.1.2 Cause valuesCause values

The following cause values can be sent from the BSC in CLEAR REQUEST. The following cause values can be sent from the BSC in CLEAR REQUEST.

C Caauussee RReeaassoonn DDeetteecctteedd bbyy 0= 0=RadioRadio Interface Interface message message failure failure Air interface Air interface Excessive TA Excessive TA

Too many measurement generations missing Too many measurement generations missing Too many measurement generations missing Too many measurement generations missing and excessive TA and excessive TA BSC BSC Air interface Air interface

MS lost at Assignment Command or Handover MS lost at Assignment Command or Handover Command

Command

BSC BSC

A

(3)

T200 expired T200 expired

Unsolicited DM response in multiple frame Unsolicited DM response in multiple frame established state established state Sequence error Sequence error H HWW,, GGSS ffaauulltt BBSSCC//TTRRCC 1=Radio 1=Radio Interface Interface Failure Failure

Air interface, for prioritized mobile that is Air interface, for prioritized mobile that is queued

queued

Excessive TA Excessive TA

Too many measurement generations missing Too many measurement generations missing Too many measurement generations missing Too many measurement generations missing and excessive TA and excessive TA BSC BSC 32=Equipment 32=Equipment Failure Failure HW HW

Transcoder resource fault Transcoder resource fault Other equipment failure Other equipment failure

BSC/TRC BSC/TRC

Abis Abis

LAPD link disturbance LAPD link disturbance LAPD link fault

LAPD link fault

TRA or transmission device fault TRA or transmission device fault BTS fault report class 1

BTS fault report class 1

BSC/BTS BSC/BTS Abis Abis Transmission failure Transmission failure BTS BTS Ater Ater

Transmission setup failure timeout on Ater Transmission setup failure timeout on Ater SCCP connection failure

SCCP connection failure Reset Circuit from TRC Reset Circuit from TRC Terrestrial resource failure Terrestrial resource failure

BSC/TRC BSC/TRC Manual intervention Manual intervention Blocking of transcoder Blocking of transcoder BSC/TRC BSC/TRC Manual intervention Manual intervention Blocking BPC Blocking BPC BSC BSC

(4)

Load BPC Load BPC Function change BPC Function change BPC New SW started BPC New SW started BPC Air interface Air interface

Connection failure to MS at handover Connection failure to MS at handover

BTS BTS

Air interface Air interface

Terrestrial resource failure Terrestrial resource failure

BSC BSC 32=Equipment 32=Equipment Failure Failure (continue) (continue) Other Other

Operational recovery failed Operational recovery failed

The BPC is being created or is about to be The BPC is being created or is about to be deleted deleted Reconfiguration of BTS equipment 1 Reconfiguration of BTS equipment 1 Reconfiguration of BTS equipment 2 Reconfiguration of BTS equipment 2 TAS system error

TAS system error TRXC failure TRXC failure TGC changeover failure TGC changeover failure Other Other BSC BSC 33=No Radio 33=No Radio Resource Resource Available Available

No radio resource available, timeout of  No radio resource available, timeout of  assignment timer (T_ASSREQ) for priority assignment timer (T_ASSREQ) for priority connection connection BSC BSC 34=Requested 34=Requested terrestrial terrestrial resource resource unavailable unavailable A

A-i-intntererffacace, e, ttererrereststririaal rl resesouourcrce e ununaavavaiilalablblee BSBSCC

41=Preemptio 41=Preemptio n n P Prreeeemmppttiioonn BBSSCC 80=Terrestrial 80=Terrestrial circuit already circuit already allocated allocated A

A--iinntteerrffaaccee, t, teerrrreessttrriiaal rl reessoouurrcce ae allllooccaatteedd BBSSCC

8 866 EExxcceessssiivve e TA TA ((SSDDCCCCHH)) BBSSCC 8 877 EExxcceessssiivve e TTA A ((TTCCHH//FF)) BBSSCC 8 888 EExxcceessssiivve e TTA A ((TTCCHH//HH)) BBSSCC 8

899 SSuuddddeennlly y lloosst t ccoonnnneeccttiioonns s ((TTCCHH//FF)) BBSSCC 9

900 SSuuddddeennlly y lloosst t ccoonnnneeccttiioonns s ((TTCCHH//HH)) BBSSCC 9

911 SSuuddddeennlly y lloosst t ccoonnnneeccttiioonnss, , oovveerrllaaiid d ssuubbcceellll (TCH/F)

(TCH/F)

BSC BSC 9

922 SSuuddddeennlly y lloosst t ccoonnnneeccttiioonnss, , oovveerrllaaiid d ssuubbcceellll (TCH/H)

(TCH/H)

BSC BSC

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9

988 LLoow w ssiiggnnaal l ssttrreennggtth h ddoowwn n oor r uupplliinnk k ppeer r cceellll (SDCCH)

(SDCCH)

BSC BSC 9

999 LLoow w ssiiggnnaal l ssttrreennggtth h ddoowwn n oor r uupplliinnk k ppeer r oovveerrllaaiidd subcell (SDCCH)

subcell (SDCCH)

BSC BSC 1

10000 LLoow w SSiiggnnaal l SSttrreennggtthh, , bbootthhlliinnk k ((TTCCHH//FF)) BBSSCC 1

10011 LLoow w SSiiggnnaal l SSttrreennggtthh, , bbootthhlliinnk k ((TTCCHH//HH)) BBSSCC 1

10022 LLoow w SSiiggnnaal l SSttrreennggtthh, , oovveerrllaaiid d ssuubbcceelll l ((TTCCHH//FF)) BBSSCC 1

10033 LLoow w SSiiggnnaal l SSttrreennggtthh, , bbootthhlliinnkk, , oovveerrllaaiid d ssuubbcceellll (TCH/H)

(TCH/H)

BSC BSC 1

10044 LLoow w SSiiggnnaal l SSttrreennggtthh, , ddoowwnnlliinnk k ((TTCCHH//FF)) BBSSCC 1

10055 LLoow w SSiiggnnaal l SSttrreennggtthh, , ddoowwnnlliinnk k ((TTCCHH//HH)) BBSSCC 1

10066 LLoow w SSiiggnnaal l SSttrreennggtthh, , ddoowwnnlliinnkk, , oovveerrllaaiid d ssuubbcceellll (TCH/F)

(TCH/F)

BSC BSC 1

10077 LLoow w SSiiggnnaal l SSttrreennggtthh, , ddoowwnnlliinnkk, , oovveerrllooaad d ssuubbcceellll (TCH/H)

(TCH/H)

BSC BSC 1

10088 LLoow w SSiiggnnaal l SSttrreennggtthh, , uupplliinnk k ((TTCCHH//FF)) BBSSCC 1

10099 LLoow w SSiiggnnaal l SSttrreennggtthh, , uupplliinnk k ((TTCCHH//HH)) BBSSCC 1

11100 LLoow w SSiiggnnaal l SSttrreennggtthh, , oovveerrllaaiid d ssuubbcceelll l ((TTCCHH//FF)) BBSSCC 1

11111 LLoow w SSiiggnnaal l SSttrreennggtthh, , uupplliinnkk, , oovveerrllaaiid d ssuubbcceellll (TCH/H)

(TCH/H)

BSC BSC 1

11122 LLoow w qquuaalliittyy, , ddoowwn n oor r uupplliinnk k ppeer r cceelll l ((SSDDCCCCHH)) BBSSCC 1

11133 LLoow w qquuaalliittyy, , ddoowwn n oor r uupplliinnk k ppeer r oovveerrllaaiid d ssuubbcceellll (SDCCH)

(SDCCH)

BSC BSC 1

11144 BBaad d qquuaalliittyy, , bbootthhlliinnk k ((TTCCHH//FF) ) BBSSCC 1

11155 BBaad d qquuaalliittyy, , bbootthhlliinnk k ((TTCCHH//HH) ) BBSSCC 1

11166 BBaad d qquuaalliittyy, , bbootthhlliinnkk, , oovveerrllaaiid d ssuubbcceelll l ((TTCCHH//FF)) BBSSCC 1

11177 BBaad d qquuaalliittyy, , bbootthhlliinnkk, , oovveerrllaaiid d ssuubbcceelll l ((TTCCHH//HH)) BBSSCC 1

11188 BBaad d qquuaalliittyy, , ddoowwnnlliinnk k ((TTCCHH//FF) ) BBSSCC 1

11199 BBaad d qquuaalliittyy, , ddoowwnnlliinnk k ((TTCCHH//HH) ) BBSSCC 1

12200 BBaad d qquuaalliittyy, , ddoowwnnlliinnkk, , oovveerrllaaiid d ssuubbcceelll l ((TTCCHH//FF)) BBSSCC 1

12211 BBaad d qquuaalliittyy, , ddoowwnnlliinnkk, , oovveerrllaaiid d ssuubbcceelll l ((TTCCHH//HH)) BBSSCC 1

12222 BBaad d qquuaalliittyy, , uupplliinnk k ((TTCCHH//FF) ) BBSSCC 1

12233 BBaad d qquuaalliittyy, , uupplliinnk k ((TTCCHH//HH) ) BBSSCC 1

12244 BBaad d qquuaalliittyy, , uupplliinnkk, , oovveerrllaaiid d ssuubbcceelll l ((TTCCHH//FF)) BBSSCC 1

12255 BBaad d qquuaalliittyy, , uupplliinnkk, , oovveerrllaaiid d ssuubbcceelll l ((TTCCHH//HH)) BBSSCC

The cause values 86 - 125 can only be received when reporting of Dropped Call The cause values 86 - 125 can only be received when reporting of Dropped Call Reason to the MSC

Reason to the MSC is activated (command RAEPC). If Dropped Call Reason to is activated (command RAEPC). If Dropped Call Reason to thethe MSC is inactive the cause value 0 or 1 is received instead.

MSC is inactive the cause value 0 or 1 is received instead.

3

3

Glossary

Glossary

BPC BPC

Basic Physical Channel Basic Physical Channel BSC

BSC

Base Station Controller Base Station Controller BSS

BSS

Base Station System Base Station System

(6)

BTS BTS

Base Transceiver Station Base Transceiver Station HW HW Hardware Hardware IE IE Information Element Information Element LAPD LAPD

Link Access Protocol on the

Link Access Protocol on the D-channelD-channel MSC

MSC

Mobile Services Switching Centre Mobile Services Switching Centre TA TA Timing Advance Timing Advance TGC TGC

Transceiver Group Controller Transceiver Group Controller TRA

TRA

Transcoder and Rate Adapter Transcoder and Rate Adapter TRC

TRC

Transcoder Rate Adaptor Controller Transcoder Rate Adaptor Controller TRXC

TRXC

Transceiver Controller Transceiver Controller

4

4

Reference List

Reference List

[1]

[1] 3GPP TS 48.0083GPP TS 48.008,, (GSM Specification)(GSM Specification) Mobile Switching Centre - Base StationMobile Switching Centre - Base Station System (MSC-BSS) Interface Layer 3 Specification.

System (MSC-BSS) Interface Layer 3 Specification. [2]

[2] Counters in the Measurement Data Base for Traffic and Event MeasurementsCounters in the Measurement Data Base for Traffic and Event Measurements in Radio Network 

Figure

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References

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