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CDPD Service. Liu ShuPing Feng Yue. Current Situation Of Mobile Data Communications. Circuit-switched cellular technology. TACS, AMPS, GSM and CDMA use now. Occupying channel during the whole connection time Packet-switched cellular technology

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Cdpd service

CDPD Service

Liu ShuPing

Feng Yue


Current situation of mobile data communications
Current Situation Of Mobile Data Communications

  • Circuit-switched cellular technology.

    • TACS, AMPS, GSM and CDMAuse now.

    • Occupying channel during the whole connection time

  • Packet-switched cellular technology

    • Each data gram is encapsulated and sent packets individually.

  • Cellular Digital Packet Data technology

    • Same Idea as Packet-Switched.


  • What is cdpd
    What Is CDPD

    • A service?

    • A technology?

    • A network?

    • A standard?


    History of amps
    History Of AMPS

    • CDPD calls AMPS “mum”.

      • AMPS, originated in 1960s, born in 1980s.

      • Birth Place: Bell Lab.

      • 1983, AMPS speech service was availble in USA.

      • Run on 800MHz, why?

        • Lower for TV and FM.

        • Higher can not be used with that time technology.

    • Fundenmental success, the first wide spread public wireless, mobile, communication service and network.


    Cdpd history
    CDPD History.

    • In 1992, AT&T, MGcaw, BAM, SW Bell, North Telecom, Ameritech provided 1000,000us$ each to make a fund for data service.

    • In 1993, the first version of standard of CDPD came into view.

    • In 1994, in America, the first CDPD experimental network run.

    • CDPD ROUND TABLE: CDPD Forum was founded on April 1994.

    • CS-CDPD was born latter. Circuit Switch, only run by GTE, number 1800.


    Features of cdpd
    Features Of CDPD

    • 19.2 kbps maximum throughput. Real user data is less than 12kbps.

    • Uses same frequency spectrum as AMPS.

    • Channel hopping. Two types. Purpose is to safe higher priority voice QoS.

    • TCP/IP Based. Very clever. Save cost, time, more reliable, compatible.

    • Dedicated Channels. AMPS voice channels lose. But it is a sign….

    • Encryption over Airinterface like GSM.

    • DSMA-CD congestion control and MAC access.

    • Available in whole USA Now.


    Cdpd network components
    CDPD Network Components

    • MDBS, Mobile Data Base Station, equal to the BTS in GSM.

      • air interface control

      • radio frequency management

      • automatic radio hopping.

  • MDIS, Mobile Data Intermediate Station. It partially combines the functions of BSC and MSC in GSM.

    • radio exchange, setting up the radio channels.

  • IS, Intermediate System. CDPD is an IP based system.CDPD backbone network is construed by the IS. We can say IS is also a router.

  • CDPD ES. M-ES and F-ES.

    • External F-ES is administered by CDPD subscribers. Internal F-ES is administered by the CDPD operators. NOTE!


  • Cdpd network service
    CDPD Network Service

    • Network Service is in term of Air Interface.

    • Domain Name Server. has its own web address translating mechanism. IS functions.

    • Subscriber Location Service. Not as accurate as GPS. Still enough.

    • Mobility Management Service. Each subscriber’s home MDIS tracks the her/his location.

    • Network Management Services.

    • Account Service.

    • Authentication Service.


    Cdpd vs gprs
    CDPD vs. GPRS

    • CDPD’s real competitor is GPRS. Because of same time, same place, similar service and targeted customers.

    • ADV:

      • Standarised earlier.

      • Operators have already invested a lot.

      • In America and Asia Pacific countries, it has in born adv, because AMPS.

      • At intial phase of service, cost for each subscriber is lower than GPRS.

  • DisADV:

    • GPRS 171.2kbps, CDPD 19.2kbps.

    • GPRS has much more larger capacity than CDPD.

    • GPRS uses TDMA GSM, but CDPD uses the FDMA AMPS.

    • GPRS can offer both Con-less, and Con-orient service, but CDPD only can provide Con-less service.

    • GPRS supports both IPv4 and IPv6. However, the CDPD only support IPv4. Less security, and address space.


  • Cdpd and gprs similarity
    CDPD And GPRS Similarity

    • Easy to enlarge the capacity.

    • Small delay.

    • Both security is high.

      • GPRS: CS-1, CS-2.

      • CDPD: Reed Solomon.


    Attractiveness and problems at america
    Attractiveness And Problems at America

    • Attractiveness: Based on TCP/IP, easy to check email.

    • Problem1: Different competitor-operators need to provide CDPD service.

    • Problem2: It was too expensive. 80$ 1MB.

    • Problem3: Software did not run well.

    • Problem4: Wireless transmission problem.

    • But Now, most of them are not new problems.


    Business of cdpd in american market
    Business Of CDPD In American Market

    • Giants: AT&T, Bell Atlantic, AT&T Wireless. Too Big. “ Trust” characteristics.

    • Now, CDPD is facing competition from GPRS service from same fathers even in its’ birth place.

    • My opinion, is because its’ rate is much slower compared with GPRS, HSCSD.


    The cdpd business in latin america
    The CDPD Business In Latin America

    • Tele2000 runs CDPD service in Latin American countries. Peru, Chile….

    • They prefer the most economic solution.

    • Tele2000 runs the service jointly with AT&T in Latin America.


    Cdpd applications
    CDPD Applications

    • 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. Adv of CDPD used in commerce field.

      • 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.


  • Cdpd in chinese market
    CDPD In Chinese Market

    • Development History Of CDPD In China Mainland.

    • CDPD In China Hong Kong.

      • M499.com is the only CDPD operator in Hong Kong.

      • Grab the gap before the 3G.

      • The market is not so big, but achievements.

      • Want to find huge local operator to do joint. I am not optimistic.

      • So M499.com comes to China Mainland to make money.


    The relation between cdpd and other plmn network in china
    The Relation Between CDPD And Other PLMN Network In China

    • HSCSD’s advantage is its’ transmission of large amount data. But CDPD is not suitable for this.

    • It can be realized that smooth connection between CDPD and narrow band CDMA.

    • Mobitex is from Ericsson. It is too slow. 8Kbps raw data.

    • CDPD is also face the new Wi-Fi Chanllenge. Because it is much faster than CDPD.

    • WAP is even more technical advanced, why lost game in China.

      • Few content.

      • Too expensive, twice more expensive than CDPD.



    Impact of wto to cdpd service
    Impact Of WTO To CDPD Service

    • More open market.

    • Foreign capital can enter.

    • Reduce the telecommunication service tarriffs.

    • Wellcome to invest!!!


    Current cdpd operators in china
    Current CDPD Operators In China

    • China Telecom. Has the position of AS&T in USA.

    • Shang Hai P&T Mobile Data Communication Co. Ltd.

    • But it seems they will not invest any more to the CDPD public service. Because our 2G systems are mainly GSM.


    Wireless atm via cdpd
    Wireless ATM Via CDPD

    • More and more popular in China.

    • Very convenient.

    • CDPD provides reliable, fast and safe access.

    • Maintenance is not very high.


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