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  • 1. Evolution-Data Optimized Presented By: Daksh Kumar Anand 2006 EEC 63
  • 2. INTRODUCTION
    • Evolution-Data Optimized or Evolution-Data only , abbreviated as EV-DO or EVDO and often EV, is a telecommunications standard for the wireless transmission of data through radio signals, typically for broadband Internet access.
    • It is standardized by 3rd Generation Partnership Project 2 (3GPP2) as part of the CDMA2000 family of standards and has been adopted by many mobile phone service providers around the world – particularly those previously employing CDMA networks.
    • It is also used on the Globalstar satellite phone network.
  • 3. INTRODUCTION contd:
    • An EV-DO channel has a bandwidth of 1.25 MHz, the same bandwidth size that IS-95A (IS-95) and IS-2000 (1xRTT) use.
    • The back-end network is entirely packet-based , and thus is not constrained by the restrictions typically present on a circuit switched network.
    • The EV-DO feature of CDMA2000 networks provides access to mobile devices with forward link air interface speeds of up to 2.4 Mbit/s with Rev. 0 and up to 3.1 Mbit/s with Rev. A.
    • The reverse link rate for Rev. 0 can operate up to 153 kbit/s, while Rev. A can operate at up to 1.8 Mbit/s.
  • 4. Forward Link: Measure downlink network to the laptop
  • 5. STANDARD REVISIONS
    • 1.1 TIA-856 Revision 0
    • 1.2 TIA-856 Rev. 0 forward link channel structure
    • 1.3 TIA-856 Rev. 0 reverse link structure
    • 1.4 TIA-856 Rev. A
    • 1.5 TIA-856 Rev. B
    • 1.6 TIA-1121
  • 6. TIA-856 Revision 0
    • The initial design of EV-DO was developed by Qualcomm in 1999 to meet IMT-2000 requirements for a greater-than-2-Mbit/s down link for stationary communications.
    • Initially, the standard was called High Data Rate (HDR), but was renamed to 1xEV-DO after it was ratified by the ITU; it was given the numerical designation TIA-856 .
    • “ 1x Evolution-Data Only”, refer to its being a direct evolution of the 1x (1xRTT) air interface standard, with its channels carrying only data traffic.
  • 7. TIA-856 Rev. 0:Forward link channel structure
    • Channel Being Time Multiplexed on the forward link means that a single mobile has full use of the forward traffic channel within a particular geographic area (a sector) during a given slot of time.
    • The forward channel is divided into slots, each being 1.667 ms long.
    • These streams include the Pilot which helps the mobile find and identify the channel, the Media Access Channel (MAC ) which tells the mobiles when their data is scheduled, and the Control Channel , which contains other information that the network needs the mobiles to know
  • 8. Whole Communication Scenario:
    • Mobile listens to the traffic on the channel, makes its best guess as to what data-rate it can sustain while maintaining a reasonable frame error rate of 1-2%.
    • It then communicates this information back to the serving sector in the form of an integer between 1 and 12 on the "Digital Rate Control" (DRC) channel.
    • Another important aspect of the EV-DO forward link channel is the scheduler called "proportional fair". .
    • The idea is to schedule mobiles reporting higher DRC indices more often, with the hope that those reporting worse conditions will improve in time.
  • 9. TIA-856 Rev. 0 reverse link structure
    • The reverse link on EV-DO Rev. 0 operates very similar to that of 3G1X CDMA.
    • The channel includes a reverse link pilot (helps with decoding the signal) along with the user data channels.
    • Only the reverse link has any sort of Power control
    • The reverse link has both open loop and closed loop power control.
  • 10.
    • All of the reverse link channels are combined using code division and transmitted back to the base station using QPSK where they are decoded.
    • The maximum speed available for user data is 153.2 kbit/s, but in real-life conditions this is rarely achieved.
    • Typical speeds achieved are between 20-50 kbit/s.
  • 11. TIA-856 Rev. A
    • The changes included the introduction of several new forward link data rates that increase the maximum burst rate from 2.45 Mbit/s to 3.1 Mbit/s.
    • Protocols that would decrease connection establishment time were introduced.
    • The reverse link was enhanced to support higher complexity modulation (and thus higher bit rates).
    • The reverse link has a maximum rate of 1.8 Mbit/s, but under normal conditions users experience a rate of approximately 500-1000kbit/s but with more latency than cable and dsl.
  • 12. TIA-856 Rev. B
    • Higher rates per carrier (up to 4.9 Mbit/s on the downlink per carrier). Typical deployments are expected to include 2 or 3 carriers for a peak rate of 14.7 Mbit/s..
    • Increased talk-time and standby time
    • Efficient support for services that have asymmetric download and upload requirements such as file transfers, web browsing, and broadband multimedia content delivery.
  • 13. TIA-1121
    • UMB (Ultra Mobile Broadband) was the brand name for a project within 3GPP2 to improve the CDMA2000 mobile phone standard for next generation applications and requirements.
    • The UMB system was to be based upon Internet (TCP/IP) networking technologies with peak rates of up to 280 Mbit/s.
    • However 3GPP added this functionality to LTE(Long Term Evolution ) , allowing LTE to become the single upgrade path for all wireless networks.
  • 14. POTENTIAL COMPETING STANDARDS
    • Motorola proposed a new system called 1Xtreme as an evolution of CDMA2000, but it was rejected by the 3GPP2 standardization body.
    • Later, a competing standard called EV-DV, for Evolution-Data and Voice , developed by Qualcomm, Lucent, Nokia, Motorola, etc. in 3GPP2 was proposed as an alternate evolution of CDMA.
    • EV-DO requires 1 or more (1.25 MHz) freq. bands in addition to the voice band.
  • 15.
    • The network cost was lower, since EV-DO uses an IP network and does not require a SS7 network and complex network switches such as a mobile switching center (MSC).
    • Also, equipment was not available for EV-DV in time to meet market demands whereas the EV-DO equipment and mobile ASIC were available and tested by the time the EV-DV standard was completed.
    • In March 2005, Qualcomm suspended development of EV-DV chipsets, and focused on improving the EV-DO product line.
  • 16. References and footnotes:
    • Wikipedia, Evolution-Data Optimized
    • EVDOforums.com
    • " CDMA2000 1xEV-DO ". QUALCOMM Technology and Solutions
    • " 3G - CDMA2000 1xEV-DO Technologies ". CDMA development Group
  • 17. THANK YOU

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