Wireless CommunicationCDMA EVDO Systems

Dr. Mustafa Shakir

Contents

CDMA 1X Packet Data Service Functional Entities

1X Packet Data Service Status CDMA Evolution EV-DO Network Architecture EV-DO Channel structure

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.

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.

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.

CDMA2000 1x Packet Domain

CSCS

PSPS

cdma2000 EVDOcdma2000 EVDO

cdma2000 1x cdma2000 1x BSC/PCFBSC/PCF

MSC/HLRMSC/HLR

I P Network

IP Network

ANAN

HLR

IPNetwork

AAAAAABilling SystemBilling System

OMC

FirewallFirewall

HA/LNSHA/LNSI P Network

IP Network

AN-AAA

PDSN/FAR-P

R-P

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.

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.

PDSN Mobile IP Access

PDSN/FA BSC/PCF

BTSZTE

BTS

FAAA

FW

IP Network

MS

FW

APP Servers

HAAA

HAZTE

Signaling

User Data

Contents

CDMA 1X Packet Data Service Functional Entities

1X Packet Data Service Status CDMA Evolution EV-DO Network Architecture EV-DO Channel structure

Service Status

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.

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

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.

How to know? When Active, Dormant by & Inactive

Bluetooth

WLAN

InsideOffice

InsideBuilding

High MobilityOutside

Low MobilityOutside

100 Mbps

10 Mbps

1 Mbps

100 kbps

1 Gbps

UMTS

GSM / GPRSGSM / GPRS

Wi-MAXWi-MAX

CDMA2000 1xEVDO

Comparison of Wireless Systems (CDMA Evolution)

Contents

CDMA 1X Packet Data Service Functional Entities

1X Packet Data Service Status CDMA Evolution EV-DO Network Architecture EV-DO Channel structure

AT

Target AN

Source AN

PCF PDSN

AN AAA

A12 AAA

AN

IP Network

AT

IP Network

AT

Target AN

Source AN

PCF PDSN

AN AAA

A12 AAA

AN

IP Network

AT

IP Network

1X EVDO Network Structure

AT access terminal

AN Access Network

A12 authentication used by the AN to authenticate 1x EV-DO Access terminal

Comparison of EVDO and 1x Networks

MS/AN

HLR

PDSN

AAA

BTSB BSCB PCF

MSC

ANAAA

Network Implementation