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CDPD: Cellular Digital Packet Data

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Title: CDPD: Cellular Digital Packet Data


1
CDPDCellular Digital Packet Data
2
What Is CDPD
  • A service?
  • A technology?
  • A network?
  • A standard?

3
Introduction
  • In 1993, the first version of standard of CDPD
    came into view.
  • In 1994, in America, the first CDPD experimental
    network run.
  • CDPD offer one of the most advanced means of
    wireless data transmission technology.
  • CDPD transmits digital packet data at 19.2 Kbps.
  • CDPD system allow user to transmit data with a
    higher degree of accuracy, strong security, and
    few service interruption

4
CDPD Definition
  • CDPD is a technique for quick transfer of data.
  • It transmitts data at 19.2 kbps.
  • It transmitt the packet over the cellular network
    in a reliable manner.
  • In 1993, the first version of standard of CDPD
    came into view.
  • In 1994, in America, the first CDPD experimental
    network run.

5
Key CDPD Characteristics
  • Availability Identifies whether CDPD services
    can be acquired from a carrier in a given region
  • Coverage Identifies whether CDPD transmission
    can reach users in a given region.
  • Reliability Identifies whether user can access
    and use CDPD services during congestion or
    network disruption
  • Transmission Speed Describe the end to end data
    speed, including call setup time transmission
    speed

6
Key CDPD Characteristics
  • 5. Privacy and Security Describe the level of
    inherent privacy and security of the service and
    the capability to add security measure
  • 6. Cost Characterizes the cost typical of
    CDPD service.

7
Features
  1. Same Coverage as cellular system
  2. Schedule data packets to unused voice channel
  3. 19.2 Kbps raw data transfer rate.
  4. Full duplex transreciever
  5. 600 mw transmit power
  6. Integrated TCP/IP protocol stack
  7. Compact size
  8. Strong aluminum case
  9. LEDs show status of CDPD operation

8
Working Of CDPD
  • It uses Channel Hopping Technique.
  • Initiates data transmission
  • Location Of available channel to establish data
    link.
  • Mobile data unit transmit data packets.
  • CDPD technology transmits chunks or packets of
    data
  • Equipment 1) CDPD Modem 2) User terminal

9
User Equipment
  • 1 .CDPD Modem
  • It Includes wireless antenna and modem that
    provides compatibility with network.
  • It can be internal or external.
  • 2 .User Terminal
  • Any device that supports IP-based data
    communication can use CDPD .
  • Examples are as notebook or laptop Personal
    Computers (PCs), handheld computers or PCs.

10
Interfaces
  • A Interface Air interface
  • I Interface Intermediate system interface
  • E Interface External interface

11
Components
  • 1. Mobile End System ( M-ES)
  • Mobile computing device which has a cdpd modem
    built-in or attached
  • It support mac functionality
  • It transmit data over the airlink to MDBS
  • It should provide transparent interface to the
    user application
  • Example is CDPD modem

12
Components
  • 2. Mobile data base station (MDBS)
  • It located at the cell site.
  • It is responsible for R.F management
  • It provide hop to hop control over the air
    interface
  • It controls the hop RF segment between the M-ES
    and the cdpd network
  • Cellular geographic area control by MDBS

13
Components
  • 3. Mobile Data Intermediate System(MDIS)
  • MDIS routs data packet to and from the CDPD N.W
    the M-ES appropriately
  • It validates M-ES using encryption keys for
    secure transmission of data
  • It is responsible for IP routing
  • An MDIS may serve single or multiple CGSA cells
  • It can provides mobile home serving functions

14
Components
  • 4. INTERMEDIATE SYSTEM (IS)
  • It is the standard IP router
  • It routes the data through IP CLNP, N.W
  • The IS components are the backbone of CDPD mesh

15
Components
  • 5. FIXED END SYSTEM (F- ES)
  • F-ES is the final destination of message sent
    from M-ES
  • F-ES received the data process it appropriately
  • The F-Es can be one of many stationary computing
    devices such as host computer , UNIX workstation

16
CDPD - Layering
IP/CLNP
Connectionless Network Protocol Subnetwork
Dependant Convergence Protocol Mobile Data Link
Protocol Media Access Control Physical
SNDCP
MDLP
MAC
Physical
Network layer CDPD Layer
17
Mobile Data Link Protocol
  • It provides logical link control services between
    Mobile End Systems and Mobile Data Intermediate
    Systems.
  • The purpose of MDLP is to transmit information
    between network layer entities across the CDPD
    Air link interface.
  • High-level data link control (HDLC)
  • Temporary equipment identifier (TEI)
  • Identifies destination mobile - virtual address.

18
Subnetwork Dependent Convergence Protocol
  • Encryption/decryption
  • User data confidentiality
  • SNDCP provides a number of services to the
    network layer
  • Compression/elimination of redundant protocol
    control information

19
Mobile Network Registration Protocol
  • Exchange of routing and registration information
    between the M-ES and a serving MD-IS.
  • Delivery of authentication information about an
    M-ES.
  • Registration and Authentication of multicast NEI.

20
Radio Resource Management
  • It prevents interference of radio channel and
    other wireless communication characteristic.
  • RRM concerns multi-user and multi-cell network
    capacity issues, rather than point-to-point
    channel capacity .
  • The objective of radio resource management is to
    maximize the system spectral efficiency in
    bit/s/Hz/base station site or Erlang/MHz/site.

21
Application of CDPD
  • Credit card verification
  • ATM network
  • Transportation Ambulance, dispatch system.
  • Public security Policemen can access the latest
    database in real time to. E.g. Check suspected
    person, Verify identity. Check the car current
    status.
  • Remote measurement Remote control.
  • Commerce. Wireless ATM. Wireless Credits Card
    Authentication. Mobile Payment.

22
Application of CDPD
  • Implementing easily.
  • High speed. CDPD modem set up time is much faster
    than wire dial up modem. Even CDPD is 19.2kbps,
    wire dial up modem is 33.6kbps.
  • Reliable and Safety with strong encryption
    algorithm.
  • Personal use which covers the main part of the
    CDPD usage.

23
Wireless ATM Via CDPD
  • More and more popular in China.
  • Very convenient.
  • CDPD provides reliable, fast and safe access.
  • Maintenance is not very high.

24
References
  • http//en.wikipedia.org/wiki/Radio_resource_manage
    ment
  • http//www.protocols.com/pbook/cdpd.htm
  • http//www.amycsizmardalal.com/research/CDPD/intro
    .html
  • http//www.webtechniques.com/archives/2001/11/jeps
    on/
  • http//en.wikipedia.org/wiki/Fleet_management
  • http//www.buzzle.com/editorials/8-29-2004-58574.a
    sp
  • http//en.wikipedia.org/wiki/Radio_resource_manage
    ment
  • http//www.protocols.com/pbook/cdpd.htm
  • http//www.amycsizmardalal.com/research/CDPD/intro
    .html
  • http//www.webtechniques.com/archives/2001/11/jeps
    on/
  • http//en.wikipedia.org/wiki/Fleet_management
  • http//www.buzzle.com/editorials/8-29-2004-58574.a
    sp
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