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  1. 1. Evolution-Data Optimized Presented By: Daksh Kumar Anand 2006 EEC 63
  2. 2. INTRODUCTION <ul><li>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. </li></ul><ul><li>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. </li></ul><ul><li>It is also used on the Globalstar satellite phone network. </li></ul>
  3. 3. INTRODUCTION contd: <ul><li>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. </li></ul><ul><li>The back-end network is entirely packet-based , and thus is not constrained by the restrictions typically present on a circuit switched network. </li></ul><ul><li>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. </li></ul><ul><li>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. </li></ul>
  4. 4. Forward Link: Measure downlink network to the laptop
  5. 5. STANDARD REVISIONS <ul><li>1.1 TIA-856 Revision 0 </li></ul><ul><li>1.2 TIA-856 Rev. 0 forward link channel structure </li></ul><ul><li>1.3 TIA-856 Rev. 0 reverse link structure </li></ul><ul><li>1.4 TIA-856 Rev. A </li></ul><ul><li>1.5 TIA-856 Rev. B </li></ul><ul><li>1.6 TIA-1121 </li></ul>
  6. 6. TIA-856 Revision 0 <ul><li>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. </li></ul><ul><li>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 . </li></ul><ul><li>“ 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. </li></ul>
  7. 7. TIA-856 Rev. 0:Forward link channel structure <ul><li>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. </li></ul><ul><li>The forward channel is divided into slots, each being 1.667 ms long. </li></ul><ul><li>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 </li></ul>
  8. 8. Whole Communication Scenario: <ul><li>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%. </li></ul><ul><li>It then communicates this information back to the serving sector in the form of an integer between 1 and 12 on the &quot;Digital Rate Control&quot; (DRC) channel. </li></ul><ul><li>Another important aspect of the EV-DO forward link channel is the scheduler called &quot;proportional fair&quot;. . </li></ul><ul><li>The idea is to schedule mobiles reporting higher DRC indices more often, with the hope that those reporting worse conditions will improve in time. </li></ul>
  9. 9. TIA-856 Rev. 0 reverse link structure <ul><li>The reverse link on EV-DO Rev. 0 operates very similar to that of 3G1X CDMA. </li></ul><ul><li>The channel includes a reverse link pilot (helps with decoding the signal) along with the user data channels. </li></ul><ul><li>Only the reverse link has any sort of Power control </li></ul><ul><li>The reverse link has both open loop and closed loop power control. </li></ul>
  10. 10. <ul><li>All of the reverse link channels are combined using code division and transmitted back to the base station using QPSK where they are decoded. </li></ul><ul><li>The maximum speed available for user data is 153.2 kbit/s, but in real-life conditions this is rarely achieved. </li></ul><ul><li>Typical speeds achieved are between 20-50 kbit/s. </li></ul>
  11. 11. TIA-856 Rev. A <ul><li>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. </li></ul><ul><li>Protocols that would decrease connection establishment time were introduced. </li></ul><ul><li>The reverse link was enhanced to support higher complexity modulation (and thus higher bit rates). </li></ul><ul><li>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. </li></ul>
  12. 12. TIA-856 Rev. B <ul><li>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.. </li></ul><ul><li>Increased talk-time and standby time </li></ul><ul><li>Efficient support for services that have asymmetric download and upload requirements such as file transfers, web browsing, and broadband multimedia content delivery. </li></ul>
  13. 13. TIA-1121 <ul><li>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. </li></ul><ul><li>The UMB system was to be based upon Internet (TCP/IP) networking technologies with peak rates of up to 280 Mbit/s. </li></ul><ul><li>However 3GPP added this functionality to LTE(Long Term Evolution ) , allowing LTE to become the single upgrade path for all wireless networks. </li></ul>
  14. 14. POTENTIAL COMPETING STANDARDS <ul><li>Motorola proposed a new system called 1Xtreme as an evolution of CDMA2000, but it was rejected by the 3GPP2 standardization body. </li></ul><ul><li>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. </li></ul><ul><li>EV-DO requires 1 or more (1.25 MHz) freq. bands in addition to the voice band. </li></ul>
  15. 15. <ul><li>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). </li></ul><ul><li>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. </li></ul><ul><li>In March 2005, Qualcomm suspended development of EV-DV chipsets, and focused on improving the EV-DO product line. </li></ul>
  16. 16. References and footnotes: <ul><li>Wikipedia, Evolution-Data Optimized </li></ul><ul><li>EVDOforums.com </li></ul><ul><li>&quot; CDMA2000 1xEV-DO &quot;. QUALCOMM Technology and Solutions </li></ul><ul><li>&quot; 3G - CDMA2000 1xEV-DO Technologies &quot;. CDMA development Group </li></ul>
  17. 17. THANK YOU