CDMA_BSSB 1X Voice and Data Call Flows

8/13/2019 CDMA_BSSB 1X Voice and Data Call Flows

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1X Voice and Data Call Flows

CDMA Customer Service

Department(Shenzhen)

20080308



Target of the Course

After taking this course, you are expected to：

Be conversant with 1X voice and data call flows;

And understand how to locate and fix problems by

analyzing call signaling flows



Content of the Course

A general introduction to the message flows of MS

originated calls, MS terminated calls, soft-handoff calls

and hard-handoff calls of normal voice services, and

also the typical messages of the call flows.

An introduction to the call flows of 4 different data call

procedures, and the detailed processing of each

procedure.

Some typical examples of fixing problems by analyzing

call signaling flows



Voice Call Flows

Originated Voice Call Flows

MS CEC CSCHP RCM DSM SDM ABPMVTC

a

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no

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aa

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Uma_OriginationMsg

Ump_BSAckOrder

Abiscr_AccessChannelMessageTransfer( ORM )

DBAccess (GetPreferredCIC)

A1r_CMServiceRequest

Abisdf_BTSSetup

Amf_FCHSetup

Amr_FCHSetupAck

Abisdr_Connect

Abisdf_ConnectAck

Abisdr_BTSSetupAck

AddChannelItemAck

Ump_ECAM

Abaf_ActivateSDM

NULL TRAFFIC Null Traffic

Preambles Preambles

UmfBSAckOrder

UmrMSAckOrder

Service Negotiation Avr_AssignmentComplete

Voice Conversation

Abiscf_PagingChannelMessageTransfer( ECAM )

DSPM BSSAP MSC RMP

DBAccessAck (GetPreferredCIC)

Tdbaccess

Tconnb

Tsetupb

T42m

A1f_AssignmentRequest

T3230&T303

AddChannelItem

Taddchannelitem

DBAccess (AllocateResource)

AddChannelItem

AddChannelItemAck

Taddchannelitem

DBAccessAck (AllocateResource)Tdbaccess

Avf_ServiceAssignment

Abisdf_PhysicalTransitionDirective

Asvr_InitiaVocoder

Abar_ActivateSDMAck

Asvr_StartVocoderCodingOrder

Asvf_StartVocoderCodingOrderAck

A1r_AssignmentComplete

Tactivatesdm

T10

Tassign

cc

dd

ee

ff

gg

hh

ii

jj

kk

ll

Tconfigtch

Asvf_InitiaVocoderAck

Tsync

Amf_PhysicalTransitionDirective

Amr_PhysicalTransitionDirectiveAck Abisdr_PhysicalTransitionDirectiveAck Tphytransdir

Abaf_StartVocoderCoding





Voice Call Flows

MS includes multiple pilots in Origination Message, and BS would

allocate radio resource in BTS according to the pilots in the received

origination message. After the radio resource is successfully allocated,

multiple BTS channels would be assigned in ECAM message sent to

MS. The MS then establishes connections with multiple BTSs

according to the assignment. The message flow is depicted below.

During the originated call procedure the access handoff is not carriedout by MS, and MS receives ECAM message from source BTS.

Soft-handoff Procedure of Originated Call



语音务流程


S S-CE C T-CE C S -CSC HP T -CSC HP SD DSP SCS-RC T-RC B SSA P

Uma_Origination

Ump_BSAckOrder

Abiscr_ACHMsgTransfer(ORM)

A1r_CMServiceRequest

Abisdf_BTSSetup

Abisdr_Connect

Abisdf_ConnectAck

Amf_FCHSetup

Amr_FCHSetupAck

Abisdr_BTSSetupAck


Avf_ActicateDSPM

Abiscf_PCHMsgTransfer(ECAM)

Ump_ECAM

Abaf_ServiceAssignment

Null Traffic Null Traffic

Preamble Preamble

Abar_ActivateSDMAck

Umf_BSAckOrder

Service Negotiation

Avr_AssignmentComplete


Conversation State

a

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f

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hi

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tu

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xUmr_MSAckOrder

T303

T10

Tactivatesdm

Tsetupb

Tconnb Tconnb

TconfigtchTconfigtch

Tassign

S-DS T-DS ABP

AddChannelItem

AddChannelItemAck

Tadd Tadd

Tadd

AddChannelItem

AddChannelItemAck

y

z

aa

bb



语音务流程

BS pages MS, and MS includes multiple pilots in Paging Response message. BS would

allocate radio resource in BTS according to the pilots in the received Paging Response

message. After the radio resource is successfully allocated, multiple BTS

channels would be assigned in ECAM message sent to MS. The MS then

establishes connections with multiple BTSs according to the assignment.

The message flow is depicted below. During the terminated call

procedure the access handoff is not carried out by MS, and MS receivesECAM message from source BTS.




语音务流程

Soft-handoff Procedure of Terminated CallS S-CEC T-CEC S-CSCHP T-CSCHP SD DSP SCS-RC T-RC BSSAP

Uma_PRM

Ump_BSAckOrder

Abiscr_ACHMsgTransfer(PRM)

A1r_PagingResponse

Abisdf_BTSSetup

Abisdr_Connect Abisdf_ConnectAck

Amf_FCHSetup

Amr_FCHSetupAck

Abisdr_BTSSetupAck



Abiscf_PCHMsgTransfer(ECAM)

Ump_ECAM

Abaf_ActivateSDM

Null Traffic Null Traffic

Preamble Preamble

Abar_ActivateSDMAck

Umf_BSAckOrder

Service Negotiation

Avr_AssignmentComplete


Conversation State

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Umr_MSAckOrder

T303

T10

Tactivatesdm

Tsetupb

Tconnb Tconnb

TconfigtchTconfigtch

Tassign

S-DS T-DS ABP

AddChannelItem

AddChannelItemAck

Tadd Tadd

Tadd

AddChannelItem

AddChannelItemAck

y

z

aa

bb

Ump_GPM T3113

Abiscf_PCHMsgTransfer(GPM)

A1f_PagingRequest

cc

dd

ee



语音务流程

Hard-handoff Procedure

S CEC CSCHP RC BSSAPSD SCDSP

a

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op

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VTC R P/HD PDS ABP

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y

A1f_HandoffRequest

DBAccess (AllocationResource)

DBAccessAck (AllocationResource)

Abisdf_BTSSetup

Amf_FCHSetup

Amr_FCHSetupAck

Abisdr_Connect

Abisdf_ConnectAck

Tsetupb

Tconnb

Tconfigtch

AddChannelItem

AddChannelItemAck Taddchannelitem

AddChannelItem

AddChannelItemAck

Taddchannelitem

Tdbacess

A1r_HandoffRequestAck

Abaf_ActivateSDM

Abar_ActivateSDMAck

NULL TRAFFIC Null Traffic

Preambles Preambles

Umr_HandoffCompletionMsg

Umf_BSAckOrder

Umf_InTrafficSystemParametersUpdateMsg

Umf_NeighborListUpdateMsg


Avr_HandoffComplete

Tassign

Asvr_InitialVocoder

Asvf_InitialVocoderAck

Tactivatesdm

A1r_HandoffComplete

Conversation State

aa

bb

Abisdf_PhysicalTransitionDirective Amf_PhysicalTransitionDirective

z

T9

Tactivatevtc

BSSAPi

cc

dd

Taddhardhoref

AddHardHOReference

AddHardHOReferenceAck

Amr_PhysicalTransitionDirectiveAck Abisdr_PhysicalTransitionDirectiveAck Tphytransdir

Tsync

Abaf_StartVocoderCoding

Asvr_StartVocoderCodingOrder

Asvf_StartVocoderCodingOrderAck

ff

gg

ee

hh

ii

DBAccess (GetHandoffProc)

DBAccessAck (GetHandoffProc)Tdbacess

jj

Abisdr_BTSSetupAck




A general introduction to the message flows of originated calls,

terminated calls, soft-handoff calls and hard-handoff calls of

normal voice services, and also the typical messages of the call

flows. An introduction to the call flows of 4 different data call

procedures, and the detailed processing of each procedure.

Some typical examples of fixing problems by analyzing call

signaling flows







数据务流程

MS originated release to Dormant state

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Umr_ReleaseOrder

Avr_ReleaseRequest

Amf_FCHRemove

Amr_FCHRemoveAck

Abaf_ReleaseSDM

Abisdr_Remove

DeleteChannelItemAck

Asdr_ReleaseRLP

A1r_ClearRequest

DeleteChannelItem

Taddchannelitem

Abar_ReleaseSDMAck

Abisdf_RemoveAck

Treleasesdm

Trel9

Tclosece

A9_ReleaseComplete

Abisdr_DropTargetAck

Treleaserlp

Tdrptgtb

Abisdf_DropTarget

DBAccess (ReleaseResource)

DeleteChannelItemAck Tdelchannelitem

DBAccessAck (ReleaseResourceAck)Tdbaccess

S CEC CSCHP RC DS SD ABPRLP DSP BSSAP SC R PPCF PDSN

Active / PPP Connected

Umf_ReleaseOrder

Trelease

Tactive

Avf_ReleaseResponse

DeleteChannelItem

A9_ReleaseA8

A1r_ClearCommand

T300

T315

A1r_ClearComplete

Asdf_ReleaseRLPAck

Tdisconb



数据务流程

MS released from Dormant state

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Umr_RegistrationMsg(MS PowerDown)

Abiscr_AccessChannelMessageTransfer(RGM)

A1r_LocationUpdate

Tupd9

A9_UpdateA8Ack

A11r_RegistrationRequest(lifetime=0)

A11r_RegistrationReply

Abiscf_PageChannelMessageTransfer(Register Accept)

A9_UpdateA8

S CEC CSCHP RC DS SD ABPRLP DSP BSSAP SC R PPCF PDSN

Dormant / PPP Connected

Ump_BSAckOrder

T3210&T3230

A1f_LocationUpdateAccept(Release indication)

Tregreq

Ump_RegistrationAccept




A general introduction to the message flows of originated calls,

terminated calls, soft-handoff calls and hard-handoff calls of

normal voice services, and also the typical messages of the call

flows. An introduction to the call flows of 4 different data call

procedures, and the detailed processing of each procedure.

Some typical examples of fixing problems by analyzing call

signaling flows



案

Case 1: call failure caused by link problem



案

From call signaling traces on last slide we can observe that the SCCP connection request

was rejected, the signaling EV_S_SccpDisconnect indicates that the link status between BSC

and MSC has problem and needs to be checked;

There are two ways to check link status between BSC and MSC:

Use the “Dynamic Management—Resource Management” function. We can check if the signalinglink is working fine and if the SCCP association is ok. It’s very quick and convenient to check the

basic status of the links by using Resource Management function.

Telnet into the CMP board and check the status of the signaling points through command lines.

The txt file above shows the interface after logging in. Input the command “ShowCallState” after

telnet and we can see that the value of “ucSPState” is 2 which indicates the link is in abnormal

state. It should be 0 if the link is fine. Then we can check the signaling configurations, and it is

found that the SPC of the BSC’s “neighboring switch” is not consistent with the MSC’s SPC and

this has caused the signaling link problem. After correcting the SPC and making it consistent with

MSC’s the link is back to normal state.



Questions

The function of T3230 and T303 timers Briefly describe the MS originated call procedure and MS terminated

call procedure.

What’s the main task of MS after it has entered and remained in Traffic

Channel State?



Documents

CDMA_BSSB 1X Voice and Data Call Flows