Wireless Communication CDMA EVDO Systems

1
(No Transcript)
2
Wireless CommunicationCDMA 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
Signaling User Data
BTS
PDSN/FA
BSC/PCF
FW
MS
BTS
IP Network
FAAA
HA
FW
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
High Mobility Outside
Low 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 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

ANAAA
20
Network Implementation