2. Wireless Communication CDMA EVDO Systems
Dr. Mustafa Shakir

3. Contents CDMA 1X Packet Data Service Functional Entities
1X Packet Data Service Status
CDMA Evolution
EV-DO Network Architecture
EV-DO Channel structure

4. PDSN
As a access gateway , PDSN (packet data service node) provides the cdma2000 mobile station with services for Internet access or Intranet access. PDSN acts as an interface between Radio Network and Packet Data Network.
Provides the mobile station with Simple IP access service or Mobile IP access service. In Simple IP,PDSN acts as a Network access server, while in Mobile IP,PDSN acts as Foreign Agent (FA) for Mobile Station.
At the cdma2000 1x stage, the maximum access rate available for each subscriber is 153.6kbps, and at the cdma2000 1x EV-DO (Evolution Data Only) stage, the maximum access rate available for each subscriber will be as high as 2Mbps.
PDSN acts as a client of AAA server.

5. AAA
AAA authenticates the script file information of the subscribers, authorizes data services, and Collects accounting information from PDSN, completes accounting.
Authentication
simple IP and mobile IP.
Authorization
subscriber configuration information.
Accounting
collecting billing data(both radio specific and IP network specific) for each packet data call.

6. Home Agent
HA(Home Agent) is responsible to maintain the current registration of the MS and redirections packets to the PDSN(FA).
Performs authentication and authorization uses AAA server.
Assigns MS home IP addresses after authentication by mobile IP protocol.
Only uses in Mobile IP.

7. CDMA2000 1x Packet Domain

8. Access Method Simple IP Access
Similar to the network access through dialing-up modem on the fixed telephone . Assigning dynamic IP addresses and accomplishing the data communication with MS as the calling party .
Simple protocol, easily accomplish, but data communication will be interrupted when MS handoff between different PPP link.

9. Access Method (Cont.) Mobile IP Access
Providing a route mechanism in the internet. Assigning MS fixed addresses to connect to any sub-network.
Accomplishing the data communication with MS as the calling party or the called party, and holding data communication when MS handoff between different PPP link.

10. PDSN Mobile IP Access IP Network Signaling User Data FW FW APP Servers
BTS
PDSN/FA
BSC/PCF FW MS
BTS
IP Network
FAAA HA FW
HAAA
APP Servers

11. Contents CDMA 1X Packet Data Service Functional Entities
1X Packet Data Service Status
CDMA Evolution
EV-DO Network Architecture
EV-DO Channel structure

12. Service Status

13. Service Status
Active/Connected: There are traffic channels between Mobile Station (MS) and BS, and data can be exchanged between them. In this state, the A10 and PPP connections are kept.
Dormant: There are no traffic channels between MS and BS. A10 and PPP connections remain.
Null/Inactive: There are neither traffic channels nor A10 connections between MS and BS. Besides, there is no PPP connection between MS and PDSN.

14. How to know? When Active, Dormant & Inactive
1. About “DRS”
When a mobile terminal sends an origination request with a packet data service option specified, it will include the Data Ready to Send (DRS) bit.
When DRS bit set to 1 to indicate that it has data to send.
When DRS bit set to 0 to indicate that it has not data to send, just to update the network

15. How to know? When Active, Dormant by & Inactive
2. About “packet data inactivity timer”
In BSC or MS, they both have a packet data inactivity timer to identify whether there are data frame sent/received or not.
The timer should be reset whenever non-idle Radio Link Protocol data frames are sent or received.
If the packet data inactivity timer expires, the BSC or MS should release the traffic channel.

16. Comparison of Wireless Systems (CDMA Evolution)
1 Gbps
100 Mbps
Wi-MAX
10 Mbps
WLAN
CDMA2000 1xEVDO
1 Mbps
UMTS
Bluetooth
100 kbps
GSM / GPRS
Inside
Office
Inside
Building
Low Mobility
Outside
High Mobility
Outside

17. Contents CDMA 1X Packet Data Service Functional Entities
1X Packet Data Service Status
CDMA Evolution
EV-DO Network Architecture
EV-DO Channel structure

18. 1X EVDO Network Structure
AT access terminal
AN access network A12 authentication used
AT access terminal
AN Access Network
A12 authentication used by the AN to authenticate 1x EV-DO Access terminal

19. Comparison of EVDO and 1x Networks
HLR
AAA
MSC
PDSN
MS/AN
BTSB
BSCB
PCF
PDSN Packet Data Serving Node
ANAAA

20. Network Implementation