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UMTS based on WCDMA

UMTS based on WCDMA. INTRODUCTION. Analogue mobile systems are commonly referred to as “First Generation” (e.g. AMPS) . Digital systems currently in use, such as GSM, CDMA one IS-95 are second generation or 2G Systems

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UMTS based on WCDMA

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  1. UMTS based on WCDMA

  2. INTRODUCTION • Analogue mobile systems are commonly referred to as “FirstGeneration” (e.g. AMPS). • Digital systems currently in use, such as GSM, CDMA one IS-95 are second generation or 2G Systems • Third generation (3G) mobile systems are designed for multimedia communication, enhanced high quality image video and access to information services • Multimedia communications require higher bandwidth than what 2G can offer.

  3. Cellular Generations • 3G • WCDMA, CDMA2000 • High service flexibility • compatibility • QOS • 2G • CDMA IS-95, GSM • FDMA, TDMA, CDMA • Voice plus Data services • 1G • Analogue or Amps • Frequency modulation • For voice transmission 1980 1990 2000

  4. User 1 User 1 User 2 User 3 Guard Band Guard Band frequency Guard Band User 2 Guard Band time User 3 TDMA User 1 User 2 User 3 time FDMA User 2 User 3 User 1 User 2 User 1 User 3 time CDMA (FH) Multiple Access Methods

  5. CDMA Pure CDMA Hybrid CDMA DS FH TH DS/FH/TH MC/MT-CDMA Slow FH Fast FH TDMA/CDMA Wideband Narrowband CDMA

  6. The 3G Choice is CDMA • Since 3G CDMA efficiently provides high quality voice services and high-speed packet data access, it is the preferred technology for 3G. • The 3G operating modes, WCDMA and CDMA2000 are all by far the most dominant in terms of current commercial services, operator deployment plans and vendor support.

  7. Conceptual Network Model • User Equipment (UE) • Mobile Equipment (ME) • UMTS Service Identity Module (USIM) • Radio Access Network (RAN) • UTRAN • GERAN • Core Network (CN) • Circuit Switched (CS) • Packet Switched (PS)

  8. Uu Iu UE: User Equipment CN: Core Network UTRAN: UMTS Terrestrial Radio Access Network UMTS High-Level System Architecture UE UTRAN CN

  9. Uu Iu Node B PLMN, PSTN, ISDN, etc. RNC MSC/ VLR GMSC USIM Node B Cu Iur Iub HLR Node B ME Internet RNC SGSN GGSN Node B UE UTRAN CN External Networks PLMN Elements USIM: UMTS Subscriber Identity Module ME: Mobile Equipment RNE: Radio Network Controller Cu, Uu, Iub, Iur, Iu are interface specifications

  10. What is WCDMA • WCDMA is a Wideband Direct-Sequence Code Division Multiple Access (DS-CDMA) system. • Information bits are spread over a wide bandwidth by multiplying the it with pseudo-random bits called chips derived from CDMA spreading codes. • The chip rate of 3.84 Mcps used in WCDMA leads to a carrier bandwidth of approximately 5 MHz. • Narrowband CDMA (IS-95) occupies a bandwidth of 1.25 MHz.

  11. Signal Spreading 1 -1 Data 1 -1 PN 1 -1 Spread Data

  12. Tx Rx Data Rb(bits/s) Data Rb(bits/s) Channel PN Sequence Spreading code Rc(chips/s) PN Sequence Spreading code Rc(chips/s) Power Power Power Frequency Frequency Frequency PN: Pseudorandom Noise Signal Spreading/Despreading

  13. Pseudorandom Codes • The ideal spreading code would be an infinite sequence of equally likely random binary digits. • In practice, periodic pseudorandom codes are used instead (PN codes). • Specific PN codes include: • maximal-length code • Gold codes

  14. Multipath Delay Profile

  15. MS Transmit Power Control • One of the most important aspects of CDMA is a tight and fast power control, in particular uplink. • Without power control,a single over powered mobile could lock the entire cell. • Fast closed-loop power control algorithm is used in WCDMA.

  16. MS1 far P1 power control commands to the mobiles P2 MS2 near Closed-Loop Power Control

  17. f2 f1 BSC Cell Handover Traditional ‘Hard’ handover in GSM

  18. f1 RNC Cell Handover ‘Soft’ handover in UMTS f1


  20. Mobile Broadband WCDMA • WCDMA for Mobile Broadband services provides key benefits like user convenience with its "everywhere coverage" and ADSL-like data speeds. • It also offers time to market and cost advantages for WCDMA operators that can build on their infrastructure assets.

  21. Mobile Broadband WCDMA • WCDMA WCDMA technology gives you a faster data connection in mobile networks: currently up to 384 kbps.. In future generations of WCDMA technology, this may increase up to even 10 Mbps. • You can do all of the usual activities: send SMS or MMS messages, download games and ringing tones, synchronize your phone with your PC calendar or corporate intranet, and browse the Internet.

  22. Mobile Broadband WCDMA • WCDMA is also fast enough for video streaming. With GPRS or EDGE phones, you can't do these things while talking. WCDMA is based on a different technology that lets you hold simultaneous voice and data connections, so you can send images and check your email while you're on the phone. • Like GPRS and EDGE, you're billed for data transferred, not for time connected, so you can be connected just about all the time.

  23. Information – Data ·Audio / Video on Demand ·Infotainment / Education ·TV & Radio distribution Internet / Intranet ·E-Mail ·WWW ·VoIP ·E-Commerce WCDMA Telecommunication ·Person-to-Person Audio/Video, Fax (ISDN) ·Mobility-Roaming ·Mailbox/Call Centre Services (SMS, Voice) ·Intelligent Network (IN) UMTS Services UMTS Based on WCDMA springs from convergence between the “World of Communication” and “Information Technology”

  24. Rich mobile services drive demand for bandwidth

  25. Application sectors considered in the Calculations • The UMTS comprises a wide area of applications, which are converted into six main service classes for this analysis. These are as follows: • Speech (S) • Simple Messaging (SM) • Switched Data (SD) • Medium Multimedia (MMM) • High Multimedia (HMM) • High Interactive Multimedia (HIMM):

  26. Application sectors Service Classes.(Cont’d) • Speech (S) -Simple one to one or one to many voice -Teleconferencing services -Voicemail • Simple Messaging(SM) -SMS and paging -E-mail delivery -Broadcast and public information • Switched Data (SD) -Low speed dial-up LAN access -Low speed Internet/Intranet Access -Fax

  27. Application sectors Service Classes. (Cont’d) • Medium Multimedia(MMM) -packet switched services which is require ‘busty’ in nature, data rates 0.5 Mbytes. -Medium LAN and Internet/Intranet Access. -Banking services • High Multimedia(HMM) -Packet switched services which is require ‘busty’ in nature, high bit rates of 10 Mbytes. -Fast LAN and Internet/Intranet Access -Video clips on demand -Audio clips on demand -Online shopping

  28. Application sectors Service Classes. (Cont’d) • High Interactive Multimedia (HIMM): -high-speed data rates with a minimum delay -Video telephony and video conferencing -Collaborative working and telepresence -Lottery and betting services Note: The first three services are the logical extensions of second generation mobile market and the last three are addressing the new mobile multimedia market.

  29. UMTS Spectrum Calculation RESULTS

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