40330059 ORL000001 CDMA Basic Communication Flow NSS ISSUE1 0

7/31/2019 40330059 ORL000001 CDMA Basic Communication Flow NSS ISSUE1 0

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HUAWEI TECHNOLOGIES CO., LTD. All rights reserved

www.huawei.com

Internal

ORA000001 CDMA Basic

Communication Flow

(NSS)

ISSUE 1.0


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HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 2

Upon completion this course, you will be able to:

Understand the basic flows of CDMA.

Understand the meaning of importantparameters.

Improve the problem analysis and fault

locating capabilities according to the flows.

Memorize the abbreviation of signalingmessages..


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References

CSOFTX3000 Technical Manual-

Service Procedures


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Chapter 1 Brief Introduction of CDMA Flows

Chapter 2 Procedures for Mobility Management

Chapter 3 Procedures for Security Management

Chapter 4 Procedures for Basic Call Service and

Short Message Service

Chapter 5 Procedures for Intelligent Network

Services


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Brief introduction of CDMA flows

Basic CDMA flows

Registration flows

Authentication flows

Calling flows

Handoff flows

Supplementary service flows

Short message flows


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Brief introduction of CDMA flows

The flows that the main services may involved in are as follows:

Mobile phone power on/off: location updating flows and

authentication flows

Mobile phone calling: calling flows and authentication flows

(IN flows)

Migration in the conversation: handoff flows and


Short message: short message flows and authentication flows

Supplementary service: supplementary service flows and



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Services


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Overview of Mobility Management

The network supports and manages mobility of a MS to:

Determine the current location of the MS.

Optimize the connection between the MS and network.

Roaming means that a MS changes the connection to a

cell and to the network. According to different statuses of a

MS, mobility management falls into location management

and handoff management.


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Location Management

It is necessary to confirm the current location of an idle MS.

Location management helps the MS to be connected to the

calling party promptly and helps the network keep tracing and

store the current location information of a MS. Location

management guarantees the consistency of the location

information stored in the HLR, MSC/VLR, and MS.

The HLR stores information on subscriber registration and

location.

The VLR stores the information loaded from the HLR,

including the subscriber registration, location, and status.

The MSC processes the flow of location registration and

exchanges data with the VLR.

The MS stores information on its location area.


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Location Registration

Location registration takes place in the following cases:

A MS is switched on.

BSS

Location_ updating_ request

Location_updating _ accept

MSC/ VLR HLR

REGNOT

regnot

IMSI, ESN,calling & called address (SPC)

Registration type, AUTHR, IMSI, ESN, MSCid

auth para required

IMS, MDN,

calling feature Indicator, trigger


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Deregistration

Deregistration can be initiated by the MS or by the VLR:

Upon receipt of a MS power-off or inactivity indication, the MSC

determines the MS needs deregistration.

The MSC/VLR removes all records of the MS from the VLR and sends

an MSINACT message to the HLR.

The HLR returns an msinact message to confirm the deregistration.

MSC/VLR

MSINACT

msinact

HLR


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Location Registration (NORMAL)


A MS moves beyond the paging coverage area of the previous locationarea.

LA1 LA2

MS

Location_Updating_Request


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A MS moves beyond the paging coverage area of the

previous location area.

BSS

Location_updating _ request

Location_ updating_ accept

MSC/VLR N HLR MSC/ VLR O

REGCANC

REGNOT

regcancregnot


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Besides, a MS timely initiates a periodic location registration.

BSS

Location _ updating _ request

Location _ updating _accept

MSC / VLR


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Questions

Whether VLR need to send all the location registrations to

HLR ? And why?

What is the meaning of MSCID in the location registration

message, and what is the function ?

Why does the switch off message need to be registered ?


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Answers Question 1: Not all the requests of location registrations are sent to HLR. If the

subscribers data has already existed in VLR and the subscriber is activated, the

registration is processed by VLR. Otherwise the registration requests are sent to HLR,

and processed by HLR.

Question 2: MSCID is the identification of MSC mainly including SID (System

Identification) and SWNO (Switch No.). It uniquely identifies one switch entity, and is

used to determine whether the MS is roaming.

Question 3: Switch off registration are mainly used to inform HLR that the subscriber

has already powered off. If other subscribers call it, system can send the access

refuse directly to the calling party according to the subscribers status in HLR.


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HandOff flow on A interface in one BSC


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HandOff flow on A interface between BSCs


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Forward HandOff


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Backward HandOff


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HandOff to Third Party


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Questions

What is the difference between Forward HandOff and

Backward HandOff?

When does the third parties handoff happen?

What is the main function of FACDIR


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Answers Question 1: the Forward Handoff is that MS handoff from the serving MSC

to a new target MSC; and the Backward HandOff is that MS handoff from

the serving MSC to the primary controlling MSC.

Question 2: Whether HandOff to Third Party happens depends on the

startup standard value of Third Party HandOff and handoff depth together,

when the current handoff times, viz. the handoff depth equal to the startup

standard value of Third Party Handoff, the MS will handoff to the third party.

Question 3: FACDIR is used to set up inter_office handoff circuits, which is

MAP circuit.


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Services


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Basic Security Management Procedure

This chapter describes functions, principles, and message flows of security

management in the CSOFTX3000. :

Security management of the CSOFTX3000 includes the following:

Authentication

Authentication protects the system resources from illegal users.Through authentication, the system verifies subscriber validity.

Authentication parameters:

A_Key SSD

RAND/RANDU/RANDBS/RANDSSD

RANDC AUTHR/AUTHU/AUTHBS

COUNT AUTHDATA


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Authentication Principle

For the same algorithm and input on both mobile station (MS)

side and network side, the output results must match. The

principle of CDMA authentication is to compare the output

results by using a same algorithm on the two sides. If theoutputs match, the authentication succeeds.


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Mobile Station Access Authentication Procedures

BSS MSC/VLR HLR/AC

Location Updating Request

AUTHREQ

authreq

REGNOT

regnot

Location Updating Accept

Procedure for authentication upon location registration.


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Procedure for authentication upon call origination.

BSS MSC/VLR HLR/AC

CM Service Request

AUTHREQ

authreq

Assignment Request

Assignment Complete


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Procedure for authentication upon call termination.

BSS MSC/VLR HLR/AC

Paging Request

Paging Response

AUTHREQ

authreqAssignment Request

Assignment Complete


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Services


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Basic Call Procedures

This section describes the procedures for the

following four types of calls:

Intra-Office Calls

Inter-Office Calls

Calls from PLMN to PSTN

Calls from PSTN to PLMN


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Intra-Office Call Procedures (TDM-BASED)

BSC - O MSCe MGW HLR BSC - T

1. CM ServiceRequest

4. LOCREQ

5. locreq6 . Paging Request

2. Add Request

7 . Paging esponse

3. Add Reply

8. Assignment Request

9. Assignment Complete

16. CONNECT

13. Assignment Complete

14. Modify Request

15. Modify Reply

12 . Assignment Request

10. Add Request

11. Add Reply

17. Modify Request18. Modify Reply

Conversation


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Intra-Office Call Procedures (TDM-BASED)

Conversation

19. Clear Request20 SubtractRequest

21 SubtractReply22. Clear Command

25. Subtract Request

27. Subtract Reply

23. Clear Complete

24. Clear Command

26 . Clear Complete

.

.

BSC - O MSCe MGW HLR BSC - T


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Inter-Office Call ProceduresBSC MSCe- O MGW- O HLR MSCe- T MGW- T BSC

CM Service Request

LOCREQ ROUTREQ

routreqlocreq

Add Request

Add Reply

Assignment RequestAdd Request

Add ReplyAssignment Complete

INVITE100

Paging Request

Paging Response

183PRACK for 183

200 for PRACK

180PRACK for 180

200 for PRACK

CONNECT200 for INVITE

Modify Request

Modify Reply

ACK for 200

Conversation

Clear RequestBYE

Subtract RequestSubtract Reply

200 for BYEClear Command

Clear Complete

Notify Reply

Notify RequestNotify Reply

Add Request

Add Reply

Add RequestAdd Reply

Assignment RequestAssignment Complete

Notify Request

Modify Request

Modify Reply

Modify RequestModify Reply


Subtract Request

Subtract Reply

Clear Command

Clear Complete

Subtract Request

Subtract Reply


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Calls from PLMN to PSTN

BSC MSCe MGW PSTN

CM Service Request

Add Request

Add ReplyAssignment Request

Add Request

Add Reply

Assignment CompleteIAM

ACM

REL

Conversation

RLC


Clear Command

Clear Complete

ANM

Subtract Request

Subtract Reply


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Calls from PSTN to PLMNPSTN GMSC HLR MSCe MGW BSC

IAM LOCREQ ROUTREQ

routreqlocreq

IAM

Paging Request

Paging Response

Add Request

Add Reply

Clear Command

Clear Complete

ACMACM Modify Request

Modify Reply

CONNECTANM

ANM

Conversation

Clear RequestSubtract Request

Subtract ReplyRELREL

RLCRLC

Assignment Request

Assignment Complete

Add Request

Add Reply

Modify Request

Modify Reply

Subtract Request

Subtract Reply


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Questions

What is the difference between the local call and inter-office call?

Please describe the flows triggered when the MS registered in

Beijing makes a call in Shenzhen.


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Answers

Question 1: There are two essential differences between Intra-office mobilecalling and Inter-office mobile calling: one is that whether the location

request message carry the TLDN or not, local office assigns the TLDN in

intra-office calling flows, the called office assigns the TLDN in inter-office

calling flows; the other is that whether the signals route outgoing according

as the TLDN. Question 2: Location Register flow, Authentication flow, Calling flow


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Basic Short Message Procedures

The SMS procedures involve processing the following:

Mobile originated short message

Mobile terminated short message

Short message notification

Short message broadcast


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Mobile Originated Short Messages

MS MSC / VLR MC HLR MSC / VLR MS

SMDPP

smdpp

SMSREQSMSREQ

smsreqsmsreq

SMDPP

SMD - REQ

SMD- ACK

smdpp

SMD- REQ

SMD- ACK


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Mobile Terminated Short Messages

MS BSC MSC/ VLR HLR MC SME

system access Location UpdatingRequest

REGNOT

regnotLocation Updating

Accept

SMDPP

smdpp

SMSREQSMSREQ

smsreqsmsreq

SMDPPSMD- REQ

SMD- ACK

smdpp


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Chapter 5 Procedures for Intelligent NetworkServices


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PPC Service Procedures in Target Network

The PPC service enables a subscriber to open an account and

activate voice services by paying beforehand or buying a

rechargeable card of a certain value.

Before a call is connected, the system accepts or rejects the call

request according to the subscriber's account balance.

During the call, the system decreases the subscriber's account

balance for the charge real-time for voice services or other

services .

When the account balance reaches a threshold, the systemdisconnects the call and plays an announcement.


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Calls Originated from PPC SubscribersMGWMSCe SCP

CM Service RequestORREQ

orreq

ANLYZD

SEIZERES

seizeres

CONNRES

Add Request

Add Reply

Assignment RequestAssignment Complete

INSTREQ

SRFDIR

Modify Request

Modify Reply

srfdir

instreq

anlyzd

OANSWER

conversation

ODISCONNECT

odisconnect

MSdisconnect

Modify Request

Modify Reply


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Calls Terminated by PPC Subscribers

MSCe HLR SCP

Call origination

LOCREQ

locreq

ANLYZD

anlyzd

LOCREQ

locreq

ANLYZD

anlyzd

TANSWER

conversation

TDISCONNECT

tdisconnect

MS answer

MS

disconnect


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Understand the basic flows of CDMA

Understand the meaning of importantparameters

Memorize the abbreviation of messages

Summary


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Thank You

40330059 ORL000001 CDMA Basic Communication Flow NSS ISSUE1 0

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