evdo service flow
TRANSCRIPT
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Customer Service Department of CDMA Division
EVDO Service Flow
EVDO Network Structure
New Concepts in EVDO
EVDO Service Flow
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Customer Service Department of CDMA Division
• EVDO Network Structure
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Customer Service Department of CDMA Division
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
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Customer Service Department of CDMA Division
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
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Customer Service Department of CDMA Division
Simple Network StructureSimple Network Structure
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Customer Service Department of CDMA Division
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.
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Customer Service Department of CDMA Division
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.
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Customer Service Department of CDMA Division
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.
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Customer Service Department of CDMA Division
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;
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Customer Service Department of CDMA Division
EVDO Service FlowEVDO Service Flow
Session Setup Flow
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Customer Service Department of CDMA Division
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.
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Customer Service Department of CDMA Division
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
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Customer Service Department of CDMA Division
New Concepts in 1xEV-DO (Cont.)New Concepts in 1xEV-DO (Cont.)
Subnet- Area of a session- BSC or PCF area
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Customer Service Department of CDMA Division
COLOR CODECOLOR CODE
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Customer Service Department of CDMA Division
SessionSession Setup Flow Setup FlowEVDO Service FlowEVDO Service Flow
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Customer Service Department of CDMA Division
Session Setup
AT AN AN_AAA PCF PDSN
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UATIRequest + RouteUpdate
ACAck
UATIAssignment
UATIComplete + RouteUpdate
ACAck
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Customer Service Department of CDMA Division
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.
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Customer Service Department of CDMA Division
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
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def
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Customer Service Department of CDMA Division
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
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e
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Customer Service Department of CDMA Division
Connection Setup Flow
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Customer Service Department of CDMA Division
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
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Customer Service Department of CDMA Division
A12 Interface Access Authentication Flow
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Customer Service Department of CDMA Division
A12 Access Authentication Flow
A12 Interface includes 3 information:A12 access request ;A12 access accept ;A12 access reject ;
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Customer Service Department of CDMA Division
A12 Access Authentication Flow
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。
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Customer Service Department of CDMA Division
A12 Access Authentication Flow
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)
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Customer Service Department of CDMA Division
A13 Interface Flow
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Customer Service Department of CDMA Division
• 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
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Customer Service Department of CDMA Division
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. . . . .. . . . . }
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Customer Service Department of CDMA Division
AT Originating Call Setup AT Originating Call Setup AT AN
ConnectionRequest + RouteUpdate
AN_AAA PCF PDSN
ACAck
TrafficChannelAssignment
Pilot + DRC
RTCAck
TrafficChannelComplete
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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
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Customer Service Department of CDMA Division
AT Originating Call CloseAT Originating Call Close
AT AN AN_AAA PCF PDSN
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ConnectionClose
A9ReleaseA8
A9ReleaseA8Complete
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Customer Service Department of CDMA Division
1xEV-DO Active期间处理话音寻呼流程
AT BS PCF1 MSC PDSN
Paging request
Page
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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
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Customer Service Department of CDMA Division
Thank You !