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GSM 移动通信系统原理培训讲义 有线接口信令协议. 上海大唐移动通信设备有限公司 2003.12. Abis 接口信令. Channel activation. Channel required. Channel request. Channel activation ack. Immediate assign command. Immediate assignment. SABM(cm_serv_req). establish indication. UA(cm_serv_req). Data request(CM service accept). - PowerPoint PPT Presentation
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3
主叫流程(一)MS BSC
Channel activation ackChannel activationChannel required
CM service accept
Call proceeding
SABM(cm_serv_req)Immediate assign command
establish indication
BTSChannel request
UA(cm_serv_req)Immediate assignment
Setup
Data request(CM service accept)
Data Ind(Setup)Data request(Call proceeding)
4
主叫流程(二)MS BSCBTS
Channel activation ackAssignment command
establish indication
Assignment Complete Deactivate SACCH
Release request(local end rel)Release confirm
RF Channle releaseRF Channel release ack
AlertingConnect
Connect acknowledge
SABMUA
Channel activation
Data req.(Assignment command)
Data Ind.(Assignment Complete)
Data req.(Alerting)Data req.(Connect)Data Ind.(Connect
acknowledge)
5
主叫流程(三)MS BSCBTS
Channel Release
Release CompleteRelease
RF Channle release
DISC
Deactivate SACCH
RF Channel release ack
Release IndicationUA
Disconnect Data Ind.(Disconnect)Data Req.(Release)
Data Ind.(Release Complete)Data Req.(Channel Release)
6
主叫流程(四)MS BSCBTS
Channel Release
Release Complete
Release
RF Channle release
DISC
Deactivate SACCH
RF Channel release ack
Release IndicationUA
Disconnect Data Ind.(Disconnect)
Data Req.(Release)Data Ind.(Release Complete)
Data Req.(Channel Release)
7
被叫流程(一)MS BSCBTS
Channel activation ackChannel activationChannel required
Call confirm
SABM(pag_resp)Immediate assign command
establish indication
Channel request
UA(pag_resp)Immediate assignment
Setup
CM service accept
Paging CommandPaging Request
Data req.(CM service accept)
Data req.(Setup)
Data ind.(Call confirm)
8
被叫流程(二)MS BSCBTS
Channel activation ackAssignment command
establish indication
Assignment CompleteDeactivate SACCHRelease requestRelease confirm
RF Channle releaseRF Channel release ack
AlertingConnect
Connect acknowledge
SABMUA
Channel activation
Data req.(Assignment command)
Data ind.(Assignment Complete)
Data ind.(Alerting)Data ind.(Connect)
Data req.(Connect acknowledge)
9
小区间切换MS BSCBTS1 BTS2
Channel activationChannel activation ack
Measurement resultHandover commandMeasurement report
Handover access
Handover complete
SABMUA
Data ind.(HO complete)
Physical information
establish indication
Handover detection
Release Request(local)Release Confirmation
RF Channel Release ACK
RF Channel Release
Data req.(HO command)
12
A接口信令MS BSS MSC
ASSIGNMENT REQUESTASSIGNMENT COMMAND
ASSIGNMENT COMPLETEASSIGNMENT COMPLETE
ASSIGNMENT REQUEST
Channel Type
Priority
Circuit Identity Code(MSC Allocate)
Downlink DTX Flag
Interference Band To Be Used
Classmark Information 2
ASSIGNMENT COMPLETE
RR Cause
Circuit Identity Code
Cell Identifier
Chosen Channel
Circuit Pool
Speech Version(Chosen)
Channel Type
Speech/data indicator:Speech/Data/Signaling
Channel rate and type:Full rate(Half rate)/SDCCH
Permitted speech version indication:FRV1/FRV2(EFR)
Priority
Preemption Capability Indicator
Priority Level:1~14
Queueing Allowed Indicator:Allowed/not Allowed
Preemption Vulnerability Indicator
Circuit Identity Code
a-k:PCM No.,max 2048
xxxxx:timeslot No.
Interference Band To Be Used
bitmap format for band1~band5
RR Cause
Normal
Circuit Pool
No1:FRV1;FR Data 12/6/3.6kbit/s
No4:FRV2; FR Data 12/6/3.6kbit/s
N05:FRV1;FRV2; FR Data 12/6/3.6kbit/s
Classmark Information 2Phase1/Phase2 MSControlled Early Classmark Sending RF Power CapabilityPseudo Synchronization CapabilitySupplementary Service Screening IndicationMT SMS pt. To pt. CapabilityFrequency Capability(GSM900 Extended?)A5/1;A5.2;A5/3Classmark 3
T10
13
A接口信令MS BSS MSC
ASSIGNMENT REQUESTASSIGNMENT COMMAND
ASSIGNMENT FAILURE ASSIGNMENT FAILURE
ASSIGNMENT FAILURE
Cause
RR Cause
Circuit Pool
Circuit Pool List
Cause
Requested terrestrial resource unavailable
Requested transcoding/rate adaption available
Requested speech version unavailable
Circuit pool mismatch
Switch circuit pool/Terrestrial circuit already allocated
Equipment failure/No radio resource available/O&M intervention
Radio interface message failure
Radio interface failure,reversion to old channel
T10
ASSIGNMENT FAILURE
ASSIGNMENT FAILURE
14
A接口信令MS BSS MSC
Clear Request
Cause
Cause
Radio interface message failure
O&M intervention
Protocol error between BSS and MSC
Preemption
CLEAR COMMANDCLEAR REQUEST
CLEAR COMPLETE
Clear Command
Cause
Cause
Call control
O&M intervention
Equipment failure
Handover successful
Protocol error between BSS and MSC
15
A接口信令
Handover RequiredCauseResponse RequestCell Identifier List(Preferred)Circuit Pool ListCurrent ChannelSpeech Version(Used)Queueing Indicator
CauseUplink Quality Uplink StrengthDownlink Quality Downlink StrengthDistance Better CellTraffic Response toMSC InvocationDirected Retry Switch Circuit PoolPreemption O&M Intervention
Response RequestRequest HANDOVER REQUIRED REJECT if result in no handover
Cell Identifier ListMax n,which is set by O&M,from 1 to 16, list is given in order of preference
CauseO&M interventionEquipment failureRequested terrestrial resource unavailableInvalid message contentsRequested transcoding/rate adaptation unavaliable
CauseRequested terrestrial resource unavailable Ciphering algorithm not supported Requested transcoding/rate adaptation unavaliable Requested Speech version unavailableCircuit pool mismatch Switch circuit poolO&M intervention Equipment failureNo radio resource available Invalid cellRadio interface failure,reversion to old channelTerrestrial resource already allocated
Handover RequestChannel Type Encryption InformationClassmark Information 1 or 2 Cell Identifier(Serving)Priority Circuit Identity CodeDownlink DTX Flag Cell Identifier(Target)Interference Band To Be Used CauseClassmark Information 3 Current ChannelSpeech version(Used) Config. Evolution IndChosen Encryption Algorithm(Serving)
Configuration Envolution IndicationSMI:Subsequent Modification Indication,whether modification is allowed or not
Classmark Information 1Phase1/Phase2 MSControlled Early Classmark Sending RF Power CapabilityA5/1
Classmark Information 3Multi-bands supported,E-GSM/DCS1800/R-GSMRF Power Capability for each bandA5/4,A5/5,A5/6,A5/7UCS2
Handover FailureCauseRR CauseCircuit PoolCircuit Pool List
Handover Required RejectCauseHandover Request ACKLayer3 InformationChosen ChannelChosen Encryption AlgorithmCircuit PoolCircuit Identity Code
Handover CommandLayer3 InformationCell Identifier
MS BSS MSCHANDOVER REQUIRED
HANDOVER REQUIED(1)
T7
HANDOVER COMMANDHANDOVER REQUIRED REJECT
HANDOVER REQUEST
BSS
HANDOVER FAILUREHANDOVER REQUEST ACK
T8
HANDOVER COMMANDHANDOVER ACCESS
HANDOVER DETECTHANDOVER COMPLETEHANDOVER COMPLETE
CLEAR COMMANDCLEAR COMPLETE
CLEAR REQUEST
HANDOVER FAILURE CLEAR COMMANDCLEAR COMPLETE
HANDOVER FAILURE
Handover DetectNo information element except for message type
Handover CompleteRR Cause
16
A接口信令
Handover PerformedCauseCell IdentifierChosen ChannelChosen Encryption AlgorithmSpeech Version(Chosen)
MS BSS MSC
T8
HANDOVER COMMAND
CLEAR COMMANDCLEAR COMPLETE
CLEAR REQUEST
HANDOVER FAILURE
HANDOVER ACCESSHANDOVER COMPLETE
HANDOVER PERFORMED
CauseUplink Quality Uplink StrengthDownlink Quality Downlink StrengthDistance Better CellTraffic Directed RetrySwitch Circuit Pool PreemptionO&M Intervention
17
A接口信令
Handover PerformedCauseCell IdentifierChosen ChannelChosen Encryption AlgorithmSpeech Version(Chosen)
MS BSS MSC
T10
ASSIGNMENT COMMAND
CLEAR COMMANDCLEAR COMPLETE
CLEAR REQUEST
ASSIGNMENT FAILUREASSIGNMENT COMPLETE
HANDOVER PERFORMED
CauseUplink Quality Uplink StrengthDownlink Quality Downlink StrengthSwitch Circuit Pool O&M Intervention
18
A接口信令MS BSS MSC
Paging
IMSI
TMSI
Cell Identifier List
Channel Needed
Cell Identifier List
Cell Identification discrimination:
1.CGI
2.LAC+CI
3.CI
4.No Cell
5.LAI
6.LAC
7.All Cells on the BSS
PAGINGPAGING REQUEST TYPE 1/2/3
Channel Needed
Any channel(default)
SDCCH
TCH/F
TCH/H or TCH/F
19
A接口信令MS BSS MSC
CM SERVICE REQUESTPAGING RESPONSE
COMPLETE LAYER 3 INFORMATION
Complete Layer 3 Information
Cell Identifier
Layer 3 Information
Chosen Channel
CM REESTABLISHMENT REQUESTLOCATION UPDATING REQUEST
IMSI DETACH
Extract classmark information
20
A接口信令MS BSS MSC
Classmark update
Classmark Information 2
Classmark Information 3
CLASSMARK REQUESTCLASSMARK ENQUIRY
CLASSMARK CHANGECLASSMARK UPDATE
(option suppress or delay)CLASSMARK UPDATE(handover)
21
A接口信令MS BSS MSC
Cipher Mode Command
Encryption Information
Cipher Response Mode
CIPHER MODE COMMAND
CIPHERING MODE COMMANDCIPHERING MODE COMPLETE
CIPHER MODE COMPLETE
CIPHER MODE REJECT
Encryption Information
Permitted algorithm:A5/1,A5/2, A5/3,A5/4, A5/5,A5/6, A5/7
Key
Cipher response Mode
IMSI must (not) be included by MSCipher Mode Reject
Cause
Cause
Ciphering algorithm not supported
Invalid message contents
Cipher Mode Complete
Layer 3 message contents
Chosen Encryption Algorithm
22
A接口信令BSS MSC
ASSIGNMENT REQUEST
ASSIGNMENT FAILURE
QUEUING INDICATION
Queuing Indication
only Message type
ASSIGNMENT COMPLETE
CLEAR REQUEST(?)T11
BSS MSCHANDOVER REQUEST
HANDOVER FAILURE
QUEUING INDICATIONHANDOVER REQUEST ACK
HANDOVER FAILURETqho
23
A接口信令MS BSS MSC
BLOCK/UNBLOCK
BLOCK
Circuit Identity Code
Cause
Connection Release Requested
Cause
No radio resource available
O&M intervention
Equipment failure
T1BLOCK/UNBLOCK ACK
BLOCK/UNBLOCK ACKBLOCK/UNBLOCK
T1
Notify to O&M
BLOCK/UNBLOCK ACKNOWLEDGE
Circuit Identity Code
UNBLOCK
Circuit Identity Code
24
A接口信令MS BSS MSC
CIRCUIT GROUP BLOCK/UNBLOCK
CIRCUIT GROUP BLOCK
Cause
Circuit Identity Code
Circuit Identity Code List
Cause
No radio resource available
O&M intervention
Equipment failure
T20CIRCUIT GROUP BLOCK/UNBLOCK ACK
CIRCUIT GROUP BLOCK/UNBLOCK ACK
CIRCUIT GROUP BLOCK/UNBLOCKT20
Notify to O&M
CIRCUIT GROUP BLOCK/UNBLOCK ACKNOWLEDGE
Circuit Identity Code
Circuit Identity Code List
CIRCUIT GROUP UNBLOCK
Circuit Identity Code
Circuit Identity Code List
Circuit Identity Code List
Range,Max 255,from CIC to CIC+255
Status,no indication/block
25
A接口信令MS BSS MSC
BLOCK/UNBLOCK
BLOCK
Circuit Identity Code
Cause
Connection Release Requested
Cause
No radio resource available
O&M intervention
Equipment failure
T21BLOCK/UNBLOCK ACK
BLOCK/UNBLOCK ACKBLOCK/UNBLOCK
T21
Notify to O&M
BLOCK/UNBLOCK ACKNOWLEDGE
Circuit Identity Code
UNBLOCK
Circuit Identity Code
26
A接口信令MS BSS MSC
CIRCUIT GROUP BLOCK/UNBLOCK
CIRCUIT GROUP BLOCK
Cause
Circuit Identity Code
Circuit Identity Code List
Cause
No radio resource available
O&M intervention
Equipment failure
T22CIRCUIT GROUP BLOCK/UNBLOCK ACK
CIRCUIT GROUP BLOCK/UNBLOCK ACK
CIRCUIT GROUP BLOCK/UNBLOCKT22
Notify to O&M
CIRCUIT GROUP BLOCK/UNBLOCK ACKNOWLEDGE
Circuit Identity Code
Circuit Identity Code List
CIRCUIT GROUP UNBLOCK
Circuit Identity Code
Circuit Identity Code List
Circuit Identity Code List
Range,Max 255,from CIC to CIC+255
Status,no indication/block
27
A接口信令MS BSS MSC
RESOURCE REQUEST
Periodicity
100ms~25500ms
RESOURCE INDICATION(1/2/3/4)
RESOURCE INDICATION(3)
RESOURCE INDICATION(1) condition metPeriod
Resource Request
Periodicity
Resource Indication Method
Cell Identifier
Extended Resource Indication
Resource Indication Method
1:Spontaneous resource information expected
2:One single resource infoprmation expected
3:Periodic resource information expected
4: No resource information expected
Extended Resource Indication
SM:Subsequent Mode(only valid forRIM=2)
0--Method 4
1--if RIM of before is 1 or 3, no changed;
otherwise, 4
TARR:Total Accessible Resource Requested
Resource Avaliable
Band1~Band5, number of idle FR/HRResource Indication
Resource Indication Method
Resource Avaliable
Cell Identifier
Total Resource Accessible
28
A接口信令MS BSS MSC
RESET
Reset
Cause
Cause
O&M intervention
Equipment failure
T13 RESET ACK
RESET (n)
RESET (1)
T16
T16
29
A接口信令MS BSS MSC
RESET
Reset
Cause
Cause
O&M intervention
Equipment failure
T2 RESET ACK
RESET (n)
RESET (1)
T4
T4
30
A接口信令MS BSS MSC
RESET CIRCUIT
Reset Circuit
Circuit Identity Code
Cause
Cause
O&M intervention
Equipment failure
RESET CIRCUIT ACK
RESET CIRCUIT(n)
RESET CIRCUIT(1)
T19
T19
UNEQUIPPED CIRCUIT
Reset Circuit ACK/Unequipped Circuit
Circuit Identity Code
31
A接口信令MS BSS MSC
RESET CIRCUIT
Reset Circuit
Circuit Identity Code
Cause
Cause
O&M intervention
Equipment failure
RESET CIRCUIT ACK
RESET CIRCUIT(n)
RESET CIRCUIT(1)
T12
T12
UNEQUIPPED CIRCUIT
Reset Circuit ACK/Unequipped Circuit
Circuit Identity Code
32
A接口信令MS BSS MSC
HANDOVER CANDIDATE ENQUIRE
Handover Candidate Enquire
Number of MSs
Cell Identifier List
Cell Identifier
HANDOVER REQUIRED(1)
HANDOVER REQUIRED(n)
Handover Candidate Response
Number of MSs
Cell Identifier
HANDOVER CANDIDATE RESPONSE
33
A接口信令BSS MSC
Overload
Cause
OVERLOAD
Cause
Processor overload
O&M intervention
OVERLOAD(ignored)T18
T17OVERLOAD
Decrease random access traffic by 1 step
Decrease random access traffic by 1 step
Increase random access traffic by 1 step
34
A接口信令BSS MSC
Overload
Cause
Cell Identifier
OVERLOAD
Cause
Processor overload
O&M intervention
CCCH overload
OVERLOAD(ignored)T6
T5OVERLOAD
Decrease MSC originated traffic by 1 step
Decrease MSC originated traffic by 1 step
Increase MSC originated traffic by 1 step
35
A接口信令MS BSS MSC
DTAP MESSAGE(SAPI in DLCI0)
SAPI “n” Reject
DLCI
Cause
SAPI “n” REJECT
Cause
O&M intervention
Processor overload
BSS not equipped
MS not equipped
36
A接口信令MS BSS MSC
CONFUSION
Confusion
Cause
Diagnostics
CONFUSION
Cause
Invalid message contents
Information element or field missing
Incorrect value
Unknown message type
Unknown information element
Protocol error between BSS and MSC
Invalid cell
UNEQUIPPED CIRCUITUNEQUIPPED CIRCUIT
Unequipped Circuit
Circuit Identity Code
Circuit Identity Code List
37
A接口信令BSS MSC BSS
LOAD INDICATION
Cause
O&M intervention
Equipment failure
No radio resource available
Processor overload
Traffic load
Load Indication
Time Indication
Cell Identifier
Cell Identifier List(Target)
Resource Situation
(if without, the indicated cell is not able to perform incoming handover request)
Cause
LOAD INDICATION
Time Indication
0:No value valid
255:infinite
others:10s~2540s
Resource Situation
number of SDCCH channel in each interference band
number of TCH/F channel in each interference band
42
动态数据库 VLR
• VLR (Visitor Location Register) :拜访位置寄存器。实际上是一个数据库,储存用户信息,主要包括:– MSRN (Mobile Station Roaming Number) : 移动台漫游号码– TMSI (Temporary Mobile Subscriber Identification) : 临时移动用户身份– 移动台登记的位置区( LAC )– 与补充业务有关的数据
• 可分配一个 MSRN ,还可以分配一个 TMSI 用于用户的身份保密。
43
静态数据库 HLR
• HLR (Home Location Register) :归属位置寄存器。实际上是一个数据库,主要储存二类数据:– 用户数据,主要包括:
• 用户的身份 IMSI (International Mobile Subscriber Identification)• 用户 ISDN 号码• VLR 地址
– 用户的位置信息
46
信令网的寻址方式• MAP 是专为 GSM 要求而设计的,是 TCAP 的一个
客户,位于 TCAP 之上。 MAP 协议支持一个物理实体同时和几个物理实体的通信,主要功能是支持移动用户的位置登记、位置删除、用户业务管理、参数管理、漫游、越区切换、鉴权、保密数据传输等。 CIC 表示该消息属于哪条话音电路(它的长度是 12 比特,因此一条数字信令链路理论上可载送 212 =4096 条话路的信令消息)。在 GSM 信令网 SP 、 STP 间传送 MAP 信令消息必须有 SCCP 的支持, SCCP 的地址是由 GT 、 DPC 、SSN 组成。
48
位置登记 / 删除• VLR HLR PVLR
Send Authen
Send Authen Ack
Update-locationCancel-location
Cancel-location AckInsert Sub.Data
Insert Sub.Date Ack
Update-location Ack
49
故障后复原程序—— VLR 复原• VLR HLR
Provide Roaming Number
Provide Roaming Number Ack.
Send Authentication
Send Authentication Ack.
Restore Data
51
故障后复原程序—— HLR 复原• HLR VLR
Reset
Update Location
Active Trace Mode
Active Trace Mode Ack.
Insert Sub.Data
Insert Sub.Data Ack
Update Location Ack
53
移动发起短消息业务传送• MSC/VLR HLR SC
Forward SM
Forward SM Ack
Send Routing Info
Send Routing Infor for SM Ack.
55
位置更新过程
VLR
HLR
VLR
BSS VMSCUmA
B
newold
Loc update cancellation
Id inquiringLocation Update 的起因:1 ) SIM 卡第一次使用2 )位置区发生变化3 )周期位置更新4 ) IMSI attach/detach
D D
G
56
位置更新流程 (1)在同一 VLR/MSC中的位置更新
MS VMSC VLRBSSLoc upd req Cmpl L3 Info Upd loc area
Authenticate Authentication req
Authentication respAuthenticate ack
Fwd new TMSI ack
Cipher mode cmdCiphering mode cmd
Upd loc area ackCiphering mode comp Cipher mode comp
Loc upd acc
TMSI reallocation cmp
Fwd new TMSI
Set ciphering mode
Update location areaTarget location area IdServing cell IdLocation update typeIMSITMSIPrevious location area Id
Update location area ACKUser errorProvider error
User errorunknown subscriberunknown location arearoaming not allowedillegal subscriberillegal equipmentsystem failure;
AuthenticateRANDCKSN
Authenticate ACKSRESSet Ciphering Modeciphering mode:no,A5/1~7Kc
Forward New TMSITMSI
Forward New TMSI ACKProvider error
57
位置更新流程 (2)在新的 VLR中的位置更新,原 VLR可及
MS VMSC VLRnBSSLoc upd req
Upd Loc area
Auth.Auth. reqAuth. resp Auth. ack
Set ciph. modeCiph. Mode cmdCiph. mode cmdFWD new TMSICiph. mode cmp
Ciph. mode cmpLoc upd acc
Fwd new TMSI ackTMSI reallocation cmp
HLR
Upd loc
Upd loc ack
VLRo
Send IdSend Id ack
Cancel location.Cancel location ack
Upd Loc area ack
Send IdentificationTMSI
Send Identification ackIMSIAuthentication setUser error:unidentified subscriberProvider error
Update locationIMSIMSC addressVLR numberLMSI
Update location ack
HLR number
User error
Provider error
User errorunknown subscriberroaming not allowedsystem failure;unexpected data value
Cancel location
IMSI
LMSI
Cancel location ack
User error: unexpected data value
Provider error
Insert subs dataInsert subs data ack
Insert subscriber dataIMSI MSISDN CategorySubscriber status Bearer service listTeleservice list Fwd info listCall bar info list CUG info listSS-data list Operator determined barring general dataOperator determined barring HPLMN dataRoaming restriction due to unsupported featureRegional subscription data VLR CAMEL subscription info
Insert subscriber data ackBearer service list Teleservice listOperator determined barring general dataSS code list Regional subscription responseSupported CAMEL phasesUser error:unidentified subscriber,data missing,unexpected data valueProvider error
Cmpl L3 Info
58
位置更新流程 (3)在新的 VLR中的位置更新,原 VLR不可及
MS VMSC VLRnBSSLoc upd req
Upd Loc area
Auth.Auth. reqAuth. resp Auth. ack
Set ciph. modeCiph. Mode cmdCiph. mode cmdFWD new TMSICiph. mode cmp
Ciph. mode cmpLoc upd acc
Fwd new TMSI ackTMSI reallocation cmp
HLR
Upd loc
Upd loc ack
VLRo
Cancel location.Cancel location ack
Upd Loc area ack
Provide IMSI ackIMSIuser error:absent subscriberProvider error
Provide IMSIID reqID resp Provide IMSI ack Send Auth. info
Send Auth info ack
Insert subs dataInsert subs data ack
Cmpl L3 Info
59
位置更新流程 (4)在新的 VLR中的位置更新,原 VLR可及,但信息丢失
MS VMSC VLRnBSSLoc upd req Upd Loc area
Set ciph. modeCiph. Mode cmdCiph. mode cmdFWD new TMSICiph. mode cmp
Ciph. mode cmpLoc upd acc
Fwd new TMSI ackTMSI reallocation cmp
HLR
Upd loc
Upd loc ack
VLRo
Cancel location.Cancel location ack
Upd Loc area ack
Provide IMSIID reqID resp Provide IMSI ack
Send IdSend Id ack
Auth.Auth. reqAuth. resp Auth. ack
Send Auth. infoSend Auth info ack
Insert subs dataInsert subs data ack
Cmpl L3 Info
60
位置更新流程 (5)
在新的 VLR中的位置更新,原 VLR可及,但信息丢失MS VMSC VLRnBSS
Loc upd req Loc upd req Loc area upd
Auth.Auth.Auth.Auth. resp Auth. resp Auth. ack
Set ciph. modeStart cipheringCiph. mode cmdLoc upd accCiph. mode cmp
Ciph. mode cmpLoc upd acc
TMSI ackTMSI reallocation cmp
HLR
Loc upd reqLoc upd ack
VLRo
Cancellation.Cancellation ack
Id req.Id req.Id req.Id resp Id resp Id resp
unknownId req.
62
清除 MS 流程MS VMSC VLRBSS
Purge MS ack
Purge MSIMSIVLR number
Purge MS
MS 没有在规定的时间里作周期性位置更新,或 O&M 操作清除 MS
Purge MS ackProvider error
63
移动主叫( MO )过程BSS VMSC
VLRVPLMN(visited)
IAM ( ISUP )
SIFOCComplete call
UmA
B
IAM : Initial address message
ISUP : ISDN user part
SIFOC : Send information for outgoing call
64
MO 信令流程MS VMSC VLRBSSCM service req Process access req
AuthenticateAuthenticate requestAuthenticate resp Authenticate ack
CM service accept Process access req acksetup SIFOC
Complete callAssignment requestAssignment cmd
Assignment comp Assignment complete
Call proceeding
IAMACMANM
AlertConnect
Connect ack
Cmpl L3 Info
Process access requestCM service typeAccess connection statusCurrent location IDTMSI/IMSICKSN
Process access request ackIMSIMSISDNUser error:Provider error
User errorunidentified subscriber illegal subscriber
illegal equipment roaming not allowed
unknown location area system failure
unexpected data value
Send information for outgoing callCalled numberBearer serviceTeleserviceCUG indexSuppress preferential CUG
Suppress CUG outgoing access
Complete callMSISDN IMEICategory GSM bearer capabilityISDN bearer capabilityISDN low layer compatibilityISDN high layer compatibilityCLIP provision CLIR override provisionCLIR provision CLIR modeCOLP provision COLR override provisionCOLR provision No Reply Condition TimerCUG index CUG interlockCUG outgoing access Advice of Charge provision
65
移动被叫( MT )过程BSSVMSC
VLR
VPLMN
IAM (ISUP) SIFICPage/ackComplete call
UmA
BGMSC
HLR
IAM(ISUP)
Send routeing info/ack Provide roaming n
umber/ack
SIFIC : Send information for incoming call
66
GMSC VLR VMSC BSS MSIAMSIFIC
Page/Search MS Paging Paging requestPaging responseProcess access req
Complete call SetupCall conf
Assignment request Ass cmdAss cmpAssignment cmp
AllertingACMConnectANMConnect ackComplete call ack
移动被叫流程Cmpl L3 Info
Process access req ack
Send Information for Incoming CallMSRNBearer serviceTeleserviceDialled numberNumber of forwardingCUG interlock
CUG outgoing access
Page IMSILocation area IDPage typeTMSI
Search MSIMSIPage typeTMSI
67
MT 获取路由信息GMSC VMSCVLRHLR
Send Routing InfoIAM
Provide Roaming Number
PRN ackSRI ack
IAM
Send Routing InformationInterrogation typeGMSC addressMSISDNAlerting PatternCUG interlockCUG outgoing accessNumber of forwardingISDN BCISDN LLC
ISDN HLC
Provide Roaming NumberIMSIMSC numberMSISDNLMSI
Provide Roaming Number ackRoaming numberUser errorProvider error
User errorAbsent Subscriber;
No Roaming Number Available;
OR Not Allowed;
Facility Not Supported;
System Failure;
Data Missing;
Unexpected Data Value
Send Routing Information ackIMSIRoaming numberForwarded-to numberForwarded-to subaddressNotification to calling partyForwarding reasonRedirecting presentationMSISDNCUG interlock
CUG outgoing access
User errorAbsent subscriber Bearer service not provisioned;
Call barred (Operator determined barring);
CUG reject (Called party SS interaction violation);
Data missing Facility not supported;
Forwarding violation Number changed;
System Failure Teleservice not provisioned;
Unexpected data value Unknown subscriber
68
江苏上海北京
MSRN 路由接续的机理TMSC
MSC/VLR
TMSC
GMSCIAM
HLRMSC/VLR
TMSC
MSC/VLR
021
021
6495SRI
PRN“13901234567”
021-64957700
6495xxxx
6485xxxx
021-64957700
MSRNMSISDN MSRN64957700
64957701 6495ABCD
“13901234567”
0123
HLR 号
70
小区内切换MSC BTSBSC MS
SABM(FACCH)
Measurement result
Channel activation ack
Establish indication
Release Confirmation
Measurement report
Assigment complete(FACCH)HO Performed
RF Channel Release ACK
Assigment command (FACCH)
Release Request
RF Channel Release
Channel activation
UA ( FACCH )Receiver
Ready(FACCH)
71
外部切换MSMSC BSS2 BSS1
Measurement Report(SACCH)
BTS2 BTS1
Measurement ResultHandover Required
Handover RequestChannel ActivationChannel Activation ACK
HO Request ACKHandover Command Handover Command(FACCH)
Handover Access(FACCH) Handover DetectionHandover Detection Physical Information (FACCH)SABM (FACCH)
Establish IndicationUA (FACCH)
Handover Complete (FACCH)Receiver Ready (FACCH)
Handover CompleteHandover Complete
Clear CommandRelease Request
Release ConfirmationRF Channel
ReleaseRF CH Release ACKClear Command
72
MS/BSS-A MSC-A MSC-B BSS-B/MS VLR-BHO Required
MSC 间切换流程(一)
Prepare Handover Target cell IDBSS APDU
Prep HO Alloc HO numberHO RequestHO Request ack
Prep HO ack Send HO reportIAM Send HO report ackACMHO Command HO Detect
Proc access sigHO CompleteSend end sig reqClear Command
ANS
ReleaseSend end sig ack
Send Handover ReportHandover numberLinked ID
Prepare Handover ackBSS APDUHandover numberUser errorProvider error
User errorNo handover number available
System failure
Unexpected data value
Data missing
Process access signalBSS APDUSend end signalBSS APDU
Clear Complete
Clear CommandClear Complete
需要电路连接的 MSC 间基本切换
73
MSC 间切换流程(二)不需要电路连接的 MSC 间基本切换
MS/BSS-A MSC-A MSC-B BSS-B/MS VLR-BHO Required Prep HO
HO RequestHO Request ack
Prep HO ack
HO Command HO DetectProc access sig
HO CompleteSend end sig reqClear Command
Send end sig ack
Clear Complete
Clear CommandClear Complete
74
MS/BSS-A MSC-A MSC-B BSS-B/MS VLR-BHO Required
MSC 间切换流程(三)
Prepare subsequent Handover Target cell IDTarget MSC numberBSS APDU
Prep sub HOHO RequestHO Request ack Prep sub HO ack
HO Command
HO DetectHO Complete
Clear Command
Release
Send end sig ack
User errorUnkown MSC
Subsequent handover failure
Unexpected data value
Data missing
Prepare subsequent Handover ack User errorProvider error
Clear Complete
MSC B 切换回 MSC A ,使用电路连接
75
MS/BSS-A MSC-A MSC-B BSS-B/MS VLR-BHO Required
MSC 间切换流程(四)Prep sub HOHO Request
HO Request ack Prep sub HO ackHO Command
HO DetectHO Complete
Clear CommandSend end sig ack
Clear Complete
MSC B 切换回 MSC A ,不使用电路连接
76
MSC-A MSC-B BSS-B/MS MSC-C VLR-CHO Required
MSC 间切换流程(五)Prep sub HO
HO Request
Prep HO ack Send HO reportIAM
ACMHO Command HO DetectProc access sig
HO CompleteSend end sig req
Clear Command
ANS
ReleaseSend end sig ack
Clear Complete
BSS-C/MS
Prep HOAlloc HO number
HO Request ack
Send HO report ack
Prep sub HO ack
ReleaseSend end sig ack
Clear CmdClear Cmpl
MSC B 切换到 MSC C ,使用电路连接
77
MSC-A MSC-B BSS-B/MS MSC-C VLR-CHO Required
MSC 间切换流程(六)Prep sub HO
HO Request
Prep HO ack
HO Command HO DetectProc access sigHO CompleteSend end sig req
Clear Command
Send end sig ack
Clear Complete
BSS-C/MS
Prep HO
HO Request ack
Prep sub HO ack
Send end sig ack
Clear CmdClear Cmpl
MSC B 切换到 MSC C ,不使用电路连接
78
MSC 间切换流程(七)不需要电路连接的 MSC 间基本切换后,建立电路连接
MS/BSS-A MSC-A MSC-B BSS-B/MS VLR-BPrep HO
Assignment RequestAssignment Cmpl
Prep HO ack
Send end sig ack Clear CommandClear Complete
Alloc HO number
Send HO report
Send HO report ackIAMACMANS
Release
79
SDCCH上的短信主叫流程MS BTS
Channel RequestRACH
AGCHSDCCHSDCCH
BSC MSCChannel RequestChannel Active
Channel Active ACKImm. AssignmentSABM(CM-SERV-
REQ) EST IND(CM-SERV-REQ) CR(CM-SERV-REQ)UA(CM-SERV-REQ) CC(AUTH-REQ)AUTH-REQ
AUTH-RESCIPH MODE CMDENCR CMDCIPH MODE CMD
CIPH MODE CMP CIPH MODE CMPSABM(SAPI=3) EST IND(SAPI=3)UA(SAPI=3)
CP-DATACP-ACK
CP-DATACP-ACK
Clear CommandChannel ReleaseDEACT SACCHDISC(SAPI=0) Release IndicationUA(SAPI=0)
Local releaseSAPI=3 Clear CompleteRF Channel Release
To SCFrom SC
80
SDCCH上的短信被叫流程MS BTSPage RequestPCH
AGCHSDCCHSDCCH
BSC MSCPaging CommandChannel Request
Channel Active ACKImm. AssignmentSABM(Page Response) EST IND(Page Resp.) CR(Page Resp.)UA(Page Resp.) CC(AUTH-REQ)AUTH-REQ
AUTH-RESCIPH MODE CMDENCR CMDCIPH MODE CMD
CIPH MODE CMP CIPH MODE CMPSABM(SAPI=3) EST REQ(SAPI=3)UA(SAPI=3)
CP-DATACP-ACK
CP-DATACP-ACK
Clear CommandChannel ReleaseDEACT SACCHDISC(SAPI=0) Release IndicationUA(SAPI=0)
Local releaseSAPI=3 Clear CompleteRF Channel Release
PagingChannel Request
Channel Active
EST CONF(SAPI=3)CP-DATA
RACHFrom SC
To SC
81
TCH上的短信主叫流程MS BTS
FACCHFACCH
SACCH
BSC MSC
To SC
ACTIVE CALL
ACTIVE CALL
CM SERV REQCM SERV ACC
SABM(SAPI=3) EST IND(SAPI=3)UA(SAPI=3)
CP-DATACP-ACK
CP-DATACP-ACK
From SC
82
TCH上的短信被叫流程MS BTS
SACCH
BSC MSC
From SC
ACTIVE CALL
ACTIVE CALL
SABM(SAPI=3)EST CONF(SAPI=3)UA(SAPI=3)
CP-DATACP-ACK
CP-DATACP-ACK
To SC
EST REQ(SAPI=3) CP-DATA
83
SDCCH上MSC间短信切换流程MS BTS-A
CP-DATAMSC-B MSBSC-A MSC-A BSC-B BTS-B
CP-ACKHANDO RQDPRE HANDOHANDO RQTCHAN ACTIV
CHAN ACTIV ACKHANDO RQT ACKPRE HANDO ACKHANDO CMD
HANDO CMD HANDO ACCHANDO DETPhysical INFHANDO DETProcess AccessSignalling SABM(SAPI=0)
UA(SAPI=0)HANDO COMPHANDO COMPSend end signal
Clear CMDRF CHAN RELRF CHAN REL ACK
Clear COMPForward Access Signalling CP-DATA EST REQ(3)SABM(SAPI=3)
EST CONF(3)UA(SAPI=3)CP-DATA
HANDO COMP
CP-ACKProcess AccessSignalling
To SC
From SC
To SC
84
SACCH上MSC间切换流程MS BTS-A
CP-DATAMSC-B MSBSC-A MSC-A BSC-B BTS-B
CP-ACKHANDO RQDPRE HANDOHANDO RQTCHAN ACTIV
CHAN ACTIV ACKHANDO RQT ACKPRE HANDO ACK
HANDO CMDHANDO CMDHANDO ACC
HANDO DETPhysical INFHANDO DETProcess AccessSignalling SABM(SAPI=0)UA(SAPI=0)
HANDO COMPHANDO COMPSend end signalClear CMDRF CHAN REL
RF CHAN REL ACKClear COMP
Forward Access Signalling CP-DATA EST REQ(3)SABM(SAPI=3)EST CONF(3)UA(SAPI=3)
CP-DATA
HANDO COMP
CP-ACKProcess AccessSignalling
To SC
From SC
To SC
IAMACM
Answer
85
优化中注意的问题• 1 ,不能建立呼叫或建立后即释放:• 在主叫用户呼叫时,未得到被叫方的任何响应,双方的信令流程正常。在这种情况下,可以检查双方 MSC 设置的 CIC 是否规范,即双方的选线方式是否正确。根据 DPC 的值的大小来设置 FIFO 或 LI
FO,否则发生“同抢”会大大降低接通率。• 2 ,用户通话过程中由于频繁切换失败,造成大量掉话:• 由于本MSC 没有预留足够 HO资源,这个问题可以从本局的局数据中得到确切结果。往往网络不断扩容,造成用户数增长很快,不能及时扩长 HO 数量。• 3 ,业务区边界存在单向切换:• 在边界上双方小区的切换成功率为 0 ,或相距较近的另一业务区小区发生不能切换的事件,则应该检查 该小区的 LAC 和 CI 是否在归属 MSC 中漏做。
86
优化中注意的问题• 4 ,建立呼叫后存在的“单通”现象过多:• 往往问题出在传输的质量上面,而这一类问题看似简单,却经常出问题。原来比较好的条件,但由于维护的疏忽和网络改造,造成“自环”或“连接”松动,并且这部分电路未隔离,所以应仔细复查。