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CDMA Signal Tracing

ZTE University

CDMA-BSS Team

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Main Content

CDMA Call Processing

Originated Call Signal Tracing

Terminated Call Signal Tracing

Call release Signal Tracing

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Originated Call

Allocatesresources

Mobile Station Base Station

Detects user-initiated call

Sends Origination MessageACCESS

(FW null traffic is arriving but themobile station does not know onwhat channel; therefore, the mobilestation cannot start decoding it)

-

Sends message with thisinformation to the switch

Sends Base Station Acknowledge-ment Order

FW TRAFFIC

Allocates resources for ServiceOption 1

Begins transmitting null ReverseTraffic Channel Data

Sends Service Request Messagefor Service Option 1 RV TRAFFIC

-

Acquires the Reverse TrafficChannel

Sends Base Station Acknowledge-ment Order

FW TRAFFIC

Sets up Forward Traffic Channel

Demodulation

Receives N5m=2 consecutive validframes

Begins sending the Reverse TrafficChannel Preamble

Sends Channel Assignment

Message

PAGING

RV TRAFFIC

Sets up Traffic Channel

Begins sending null traffic

Stops probingPAGING

CM ServiceRequest

Assignment

Request

MSC

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Originated Call

(User Conversation)(User Conversation)

Optional

Applies ring back from audio path or

voice record information

Optional

Removes ring back from audio path

Begins processing traffic inaccordance with Service Option 1

Sends Service ConnectCompletion Message

RV TRAFFIC

Optional

Sends ring back tone or voice

record information

Optional Sends tones off

indicating that the mobile stationis ready

FW TRAFFIC

FW TRAFFIC

Completes

the call setup

Allocates resources for ServiceOption 1

Sends Service Connect Message

Mobile StationBase Station

FW TRAFFIC

MSC

Assignment

Completion

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Originated Call

MS BS

Origination Message

Service Connect Complete Message

BSAckOrder

Extended Channel Assignment Message

FFCH Null Traffic

RFCH Preamble

BSAckOrder

MSAckOrder

Service Connect Message

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Originated Call

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Originated Call

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Originated Call

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Originated Call

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Originated Call

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Stops probing

(FW null traffic is arriving but themobile station does not know onwhat channel; therefore, the mobilestation cannot start decoding it) Sets up Traffic Channel

Begins sending null TrafficChannel data

Acquires the Reverse TrafficChannel

Sends Base Station Acknowledge-ment Order

Sets up Forward Traffic ChannelDemodulation

Receives N5m=2 consecutivevalid frames

Begins sending the ReverseTraffic Channel Preamble

Begins transmitting null Traffic

Channel data

Sends General Page Message

Sends Page Response Message

Receives pagemessage fromthe MSC or PSTN

Uses HLR/VLR toget location andstatus of the targetmobile station

Sends Page

request to theappropriate BaseStation(s)

ACCESS

PAGING

RV TRAFFIC

FW TRAFFIC

PAGING

FW TRAFFIC

RV TRAFFIC

Mobile Station Base Station

Sends Channel AssignmentMessage

Sends Base Station Acknowledge-ment Order

Sends message to switchindicating that the mobile stationhas responded

Allocatesresources

PAGING

Terminated CallMSC

Page Request

Page Response

Assignment Request

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Terminated Call

SendsAlert With InformationMessage (ring)

Begins processing traffic inaccordance with Service Option 1

Sends Service ConnectCompletion Message

Starts ringing

User answers call

Stops ringing

Sends Connect Order

(User Conversation) (User Conversation)

FW TRAFFIC

RV TRAFFIC

RV TRAFFIC

Sends Service Connect MessageFW TRAFFIC

Sends message to the switchindicating that the mobilestation is ready

Call proceeds

Allocates resources for ServiceOption 1

Sends Service Response Messageaccepting Service Option 1

RV TRAFFIC

Sends Service Request Msgfor Service Option 1

FW TRAFFIC

Begins transmitting null TrafficChannel data RV TRAFFIC

Mobile Station Base Station

Assignment

Completion

MSC

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Terminated Call

MS BS

Page Response Message

Service Connect Complete Message

BSAckOrder

Extended Channel Assignment Message

FFCH Null Traffic

RFCH Preamble

BSAckOrder

MSAckOrder

Service Connect Message

Page Message

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Call release

Mobile Station Order(release)

MS BS

Release Order

Release Order

Base Station Order(release)

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Call release

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