EVDO Service Flow

Internal Use Only ▲

Customer Service Department of CDMA Division

EVDO Service Flow

EVDO Network Structure

New Concepts in EVDO

EVDO Service Flow



• EVDO Network Structure



AT

HLR

PDSN

AAA

BTS BSC PCF

MSC

A10/A11

HA

ANAAA

Access Network ( 1x and DO )

EVDO NETWORK STRUCTUREEVDO NETWORK STRUCTURE

AT ： access terminal AN ： access network ， including BSC and BTS AN AAA ： AAA server for access network

PCF – Packet Control FunctionPDSN – Packet Data Serving NodeAAA – Authentication,

Authorization & Accounting



Difference with 1x Reference NetworkDifference with 1x Reference Network

1xEV-DO is data only, so no interface to MSC/HLRThe Packet Data Domain

equipment （ PDSN 、 AAA 、 HA ） is same as 1X Independent Access network AAA server Two A interfaces added:- A12 for access system authentication- A13 for AT roaming Home AN and Foreign AN interaction



Simple Network StructureSimple Network Structure



A1 / A2 InterfaceA1 / A2 Interface

A1 The A1 interface carries signaling information between BSC and MSC, including signaling messages related with call processing, mobility management, radio resource management, authentication and encryption.

A2 The A2 interface mainly carries 64/56K PCM information between BSS side and MSC side.



A3/A7 InterfaceA3/A7 Interface

A3 interface is used to support the soft handoff (BSCs are interconnected) between BSSs when the MS is in the traffic channel status. A3 interface is divided into two parts: A3 signaling interface and A3 traffic interface.

A7 interface is used to support the handoff between BSSs when the MS is not yet under the control of traffic channel status, and support the control stream when the MS undergoes soft handoff between BSSs and new service needs to be established.



A8/A9, A10/A11, A12 and A13 InterfacesA8/A9, A10/A11, A12 and A13 Interfaces

A8/A9 interface is adopted to carry user data and signaling respectively between BSC and PCF.

A10/A11 interface is adopted to carry data transmission and signaling respectively between PCF and PDSN.

A12 interface carries signaling information of access authentication (only include 3 messages: access request, accept, reject). A13 interface exchanges signaling when AT is roaming between source AN and target AN.



EVDO Service FlowEVDO Service Flow

Any normal service flow must contain the following courses according to the certain order;

Set up and configure session environment;

Set up air interface connection;

Set up A12 access authentication

set up A8/A9 link;

set up A10/A11 link;



EVDO Service FlowEVDO Service Flow

Session Setup Flow



New Concepts in 1xEV-DONew Concepts in 1xEV-DO

Session- Shared state between the access terminal and the access network

- This shared state stores the protocols and protocol configuration attributes that were negotiated and is used for communications between the access terminal and the access network;

- Information : A unicast address (UATI) that is assigned to the access terminal, the set of protocol configuration attributes is used by the access terminal and the access network to communicate over the air-link, etc

- When the value of protocol configuration attributes is changed, Session negotiation is performed between the access terminal and the access network. An access terminal cannot communicate with an access network without having an open session.



New Concepts in 1xEV-DO (Cont.)New Concepts in 1xEV-DO (Cont.)

UATI (Unicast Access Terminal Identifier)

- A universally unique address that is assigned to each access terminal in a subnet

- As the 128-bit address is assigned but never required to be sent on the access channel, the access network can always send the short (32 bits) version of the UATI



New Concepts in 1xEV-DO (Cont.)New Concepts in 1xEV-DO (Cont.)

Subnet- Area of a session- BSC or PCF area



COLOR CODECOLOR CODE



SessionSession Setup Flow Setup FlowEVDO Service FlowEVDO Service Flow



Session Setup

AT AN AN_AAA PCF PDSN

a

b

c

d

e

UATIRequest + RouteUpdate

ACAck

UATIAssignment

UATIComplete + RouteUpdate

ACAck



Session SetupSession Setup

UATI Assignment Procedure This procedure is initiated when the

AT receives the Session Close message from AN or transmits the Session Close message to AN

This procedure is initiated when the AT detects a change of Subnet after moving the Subnet boundaries

Session Negotiation Procedure It is initiated that an AT doesn’t have a

session that acquired from session configuration protocol with AN.

It is initiated that an user request connection setup for packet data service in a subnet that the value of configuration attributes has been changed because an AT crosses a subnet or an user changes the value of that.



Session SetupSession Setup

AT S_FSPS_CEC S_RCM S_TP S_SP S_BSSAP

UmcKeepAliveRequest

UmaKeepAliveResponse + UmaRouteUpdate

UmcACAck

Tsmpclose/NsmpkeepaliveTimeout

ResetTsmpclose/Nsmpkeepalive

UmaKeepAliveRequest + UmaRouteUpdate

UmcACAck

UmcKeepAliveResponse

ab

c

def



在相同 AN 下 AT 发起的 UATI 更新

AT S_FSPS_CEC S_RCM

UmaUATIRequest + UmaRouteUpdate

S_TP S_SP S_BSSAP

UmcACAck

UmcUATIAssignment

UmaUATIComplete + UmaRouteUpdate

UmcACAck

TUATIAssignment

a

b

c

d

e



Connection Setup Flow



Connection SetupConnection Setup

Connection Setup Procedure

This figure illustrates the

process of opening a

connection between the

access terminal and the

access network

Connection procedure is

always performed at the

initiative of the AT sending a

ConnectionRequest and

RouteUpdate message



A12 Interface Access Authentication Flow



A12 Access Authentication Flow

A12 Interface includes 3 information：A12 access request ;A12 access accept ;A12 access reject ;




AN

AN AAASERVER

AT

1 PPP/ LCP，协商

2 CHAP Chanl l enge，

3 CHAP Response，

4 A12 aceess request，

5 A12 aceess accept，

6 CHAP authenti cate，success

1. AT negotiates about PPP and LCP with AN；2. AN sends random number which will be generated by itself to AT；3. AT makes a response to AN by sending itself’s NAI and related information4. AN constructs A12 access request information and send it to AN AAA;5. AN AAA makes a judge and responds to AN by sending A12 access

accept information with AT’s IMSI ；6. AN sends successful information of authentication to AT。




MS/AT AN AN-AAA

CHAP Challenge

CHAP Response

A12-Access request

A12-Access Acceptor A12-Access Reject

CHAP-Auth Successor CHAP-Auth Failure

PPP and LCP Negotiation(CHAP)



A13 Interface Flow



• A13 interface is used to support exchanges signaling when AT is roaming between source AN and target AN.

• A13 includes four information： A13 session information request; A13 session information response; A13 session information confirm;

A13 session information reject;

A13 Interface Introduction



A13 Access Flow

AN源 AN目的

2 A13 sessi on i nformati on request，

3 A13 sessi on i nformati on repl y，

6 A13 sessi on i nformati on confi rm，

UATI =123

{ UATI =123. . . . .. . . . . }



AT Originating Call Setup AT Originating Call Setup AT AN

ConnectionRequest + RouteUpdate

AN_AAA PCF PDSN

ACAck

TrafficChannelAssignment

Pilot + DRC

RTCAck

TrafficChannelComplete

a

b

c

d

e

f

g

h

i

j

k

l

m

n

o

p

q

r

AT or AN indicates readyto exchange data on

access stream

PPP and LCP negotiation

CHAP challenge andresponse

A12AccessRequest

A12AccessAccept

CHAP Authenticationsuccess

AT ready to exchange dataon service stream

A9SetupA8

A9ConnectA8

A11RegistrationRequest

A11RegistrationReply

Establishing PPP connections

Transmitting packet Data s



AT Originating Call CloseAT Originating Call Close

AT AN AN_AAA PCF PDSN

a

b

c

d

e

ConnectionClose

A9ReleaseA8

A9ReleaseA8Complete



1xEV-DO Active期间处理话音寻呼流程

AT BS PCF1 MSC PDSN

Paging request

Page

a

b

c

d

e

f

g

h

i

j

k

l

PCF2

Assignment request

A9setupA8

Assignment complete

A11 registration request

A11 registration request

A11 registration reply

m

n

o

p

AN

I S2000 1xEV-DO

1xEV-DO active data session

MS/AT stops transmitting to the AN X

Page response

Paging response

TCH setup

A9-AL disconnected

A9-AL disconnected ack A8

Alert with info

Origination for concurrent service

A9connectA8

Assignment complete

IS2000 active data session

connect

connect

A9 release A8

A11 registration reply

A9 release A8 complete

q

r

s

t

u

v

w

x

y

z



Thank You !

EVDO Service Flow

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