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Mobile communications: present and future (Part- II) Dr. Abhaya Sumanasena MSc PhD CEng MIET MIEEE 22 January 2009 Dr. Abh...
Introduction to  HSDPA Dr. Abhaya Sumanasena
What is HSDPA ? Dr. Abhaya Sumanasena
Overview 3GPP WCDMA Evolution UL = Uplink DL =Downlink DL: 100 mbps UL:  50 mbps LTE Dr. Abhaya Sumanasena
HSDPA <ul><li>HSDPA services provide users with a &quot;broadband experience&quot; today on mobile </li></ul><ul><li>HSDPA...
Some Basics Dr. Abhaya Sumanasena
Paths for packet and voice calls Dr. Abhaya Sumanasena HSDPA is only about data!
Downlink in R’99 & HSDPA Dr. Abhaya Sumanasena
R’99 & HSDPA channel usage R’99 uses dedicates  the channels to user Node  B Dr. Abhaya Sumanasena HSDPA shares  the channel
Dr. Abhaya Sumanasena ≈  SR signal  strength Variable channel conditions signal  quality Real time  measurement  for a  st...
HSDPA solution: Adaptive Modulation and Coding <ul><li>data rate is adjusted by modifying: </li></ul><ul><li>modulation sc...
Modulation 0 1 0 1 1 0 0 1 QPSK modulator QAM modulator QAM symbols QPSK symbols bit stream from  data service Dr. Abhaya ...
Coding 0 1 0 1 bit stream (4 bits) ½ rate  Encoder 0 1 0 1 0 1 0 1 Encoded bits (8 bits) Require higher bandwidth 0 1 0 1 ...
Coverage and Capacity 3.6 Mbps 1.8 Mbps 500 kbps QAM 3/4 coding QAM 1/2 coding QPSK 1/2 coding Dr. Abhaya Sumanasena
Short frame adapts faster & reduces delay 10 ms 10 ms Longer frame in R’99 Dr. Abhaya Sumanasena Node  B 2 ms 2 ms Short T...
Adaptation based on the Channel Quality Reporting HSDPA Modulation/coding  According to proposed CQI CQI information  (eve...
UE Capabilities   1.2Mbps class 7 Mbps class 3.6 Mbps class 10 Mbps class Released/soon to be released HSDPA handsets.   C...
What do the operators have to do ? Dr. Abhaya Sumanasena
More intelligence in the Node B Dr. Abhaya Sumanasena RNC <ul><li>Reduces the delay </li></ul><ul><li>Makes the system mor...
What is there for the user ? Dr. Abhaya Sumanasena
How fast ? <ul><li>Overhead (who the end user, where it is coming from, signalling) reduces the BW for actual information ...
End User Experience Impact of HSDPA’s High Data rates Source: Qualcomm Dr. Abhaya Sumanasena
HSDPA Success story Dr. Abhaya Sumanasena
Source:GSMA Current status Notebook/ PC modems 41.8% Wireless routers Phones/ Consumer  Devices 48.8% Dr. Abhaya Sumanasen...
Future Directions Dr. Abhaya Sumanasena
LTE <ul><li>What is LTE:  </li></ul><ul><li>The next step in the evolution of 3GPP ( Rel-8 ) radio interfaces to deliver “...
Regulatory aspects Dr. Abhaya Sumanasena
<ul><li>Principal duty under the Communications Act to further the interests of consumers, where appropriate by promoting ...
Thank you! (please send your feedback abhaya@theiet.org) Dr. Abhaya Sumanasena
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Abhaya 4 Slintec Jan08 Part2

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Mobile communications: present and future (Part 2) By Dr. Abhaya Sumanasena MSc PhD CEng MIET MIEEE

Delivered on 22 January 2009 @ SLINTEC

Published in: Business, Technology
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Abhaya 4 Slintec Jan08 Part2

  1. 1. Mobile communications: present and future (Part- II) Dr. Abhaya Sumanasena MSc PhD CEng MIET MIEEE 22 January 2009 Dr. Abhaya Sumanasena
  2. 2. Introduction to HSDPA Dr. Abhaya Sumanasena
  3. 3. What is HSDPA ? Dr. Abhaya Sumanasena
  4. 4. Overview 3GPP WCDMA Evolution UL = Uplink DL =Downlink DL: 100 mbps UL: 50 mbps LTE Dr. Abhaya Sumanasena
  5. 5. HSDPA <ul><li>HSDPA services provide users with a &quot;broadband experience&quot; today on mobile </li></ul><ul><li>HSDPA delivers a 5-fold increase in downlink data speeds. </li></ul><ul><li>It increases spectrum efficiency by using adaptive modulation and coding </li></ul><ul><li>HSDPA is a most cost effective way to provide high-speed broadband access to both rural communities and the developing world [GSMA] </li></ul><ul><li>HSDPA users can roam up to 55 countries [GSMA] </li></ul><ul><li>Deployed in many frequency bands ( 850, 900,1700, 1800, 1900 and 2100 MHz) </li></ul><ul><li>Leverages the existing 3G assets </li></ul><ul><li>Spectrum </li></ul><ul><li>Subscriber base </li></ul><ul><li>Network infrastructure (sites, radio, core network, transmission) </li></ul><ul><li>Operation and Management system and staff </li></ul><ul><li>Subscriber management systems (authentication, billing) </li></ul>Dr. Abhaya Sumanasena
  6. 6. Some Basics Dr. Abhaya Sumanasena
  7. 7. Paths for packet and voice calls Dr. Abhaya Sumanasena HSDPA is only about data!
  8. 8. Downlink in R’99 & HSDPA Dr. Abhaya Sumanasena
  9. 9. R’99 & HSDPA channel usage R’99 uses dedicates the channels to user Node B Dr. Abhaya Sumanasena HSDPA shares the channel
  10. 10. Dr. Abhaya Sumanasena ≈ SR signal strength Variable channel conditions signal quality Real time measurement for a stationary mobile Current solution = power control
  11. 11. HSDPA solution: Adaptive Modulation and Coding <ul><li>data rate is adjusted by modifying: </li></ul><ul><li>modulation scheme </li></ul><ul><li>effective code rate </li></ul><ul><li>number of codes </li></ul>Modulation: 16QAM Coding: ½ rate Modulation : QPSK Coding : 1/3 rate Dr. Abhaya Sumanasena
  12. 12. Modulation 0 1 0 1 1 0 0 1 QPSK modulator QAM modulator QAM symbols QPSK symbols bit stream from data service Dr. Abhaya Sumanasena 1 0 1 1 0 1 1 1 0 1 1 1 0 1 1 0 1 0
  13. 13. Coding 0 1 0 1 bit stream (4 bits) ½ rate Encoder 0 1 0 1 0 1 0 1 Encoded bits (8 bits) Require higher bandwidth 0 1 0 1 bit stream (4 bits) 1/3 rate Encoder 0 1 0 1 0 1 0 1 Encoded bits (12 bits) Require higher bandwidth 0 1 0 1 amount of redundancy increases Coding gain increases Bandwidth increases Dr. Abhaya Sumanasena
  14. 14. Coverage and Capacity 3.6 Mbps 1.8 Mbps 500 kbps QAM 3/4 coding QAM 1/2 coding QPSK 1/2 coding Dr. Abhaya Sumanasena
  15. 15. Short frame adapts faster & reduces delay 10 ms 10 ms Longer frame in R’99 Dr. Abhaya Sumanasena Node B 2 ms 2 ms Short TTI (2 ms) in HSDPA Reduced round trip delay
  16. 16. Adaptation based on the Channel Quality Reporting HSDPA Modulation/coding According to proposed CQI CQI information (every 2ms…..160ms) UE No of codes 1.44 mbps 1.44 mbps 1.6 mbps 1.6/2.8 mbps 1.6/2.24 mbps 1.6/2.56 mbps 1.6/2.88 mbps 1.6/3.2 mbps 1.6/3.36 mbps 1.6/3.36 mbps 1.6/3.36 mbps Throughput Dr. Abhaya Sumanasena Node B
  17. 17. UE Capabilities 1.2Mbps class 7 Mbps class 3.6 Mbps class 10 Mbps class Released/soon to be released HSDPA handsets.   CAT 12 (2Mbps) : LGE U830 CAT 6 (3.6Mbps): Moto V3xx; LGE U970; Nokia N95; Nokia 6120; Classic, HUAWEI E220;USB Modem,SEM W910 Dr. Abhaya Sumanasena
  18. 18. What do the operators have to do ? Dr. Abhaya Sumanasena
  19. 19. More intelligence in the Node B Dr. Abhaya Sumanasena RNC <ul><li>Reduces the delay </li></ul><ul><li>Makes the system more efficient </li></ul><ul><li>New functions (Scheduling, Feedback handling, </li></ul><ul><li>Adaptive modulation and coding) </li></ul>Additional capacity Software upgrade Core network Base station (NodeB) UE SW upgrade Backhaul capacity Capacity upgrade
  20. 20. What is there for the user ? Dr. Abhaya Sumanasena
  21. 21. How fast ? <ul><li>Overhead (who the end user, where it is coming from, signalling) reduces the BW for actual information </li></ul><ul><li>UE capability </li></ul><ul><li>Simultaneous connections </li></ul><ul><li>Network capability (not every Node B is ready) </li></ul><ul><li>Environment/interference </li></ul><ul><li>Backhaul Capacity </li></ul><ul><li>Speed of the content delivery </li></ul>Dr. Abhaya Sumanasena
  22. 22. End User Experience Impact of HSDPA’s High Data rates Source: Qualcomm Dr. Abhaya Sumanasena
  23. 23. HSDPA Success story Dr. Abhaya Sumanasena
  24. 24. Source:GSMA Current status Notebook/ PC modems 41.8% Wireless routers Phones/ Consumer Devices 48.8% Dr. Abhaya Sumanasena July 2008, nearly one quarter (23 per cent) of people who access the internet away from home or work said that they did so using a USB dongle or datacard <ul><li>HSPA devices </li></ul><ul><ul><li>150 % annual growth on HSPA devices </li></ul></ul><ul><ul><li>637 devices by 3rd April 07 </li></ul></ul><ul><ul><li>190 supports 3.6 Mbps </li></ul></ul><ul><ul><li>211 in 850 band </li></ul></ul><ul><ul><li>128 devices support 7.2 Mbps </li></ul></ul><ul><ul><li>91 devices in 1900 band </li></ul></ul><ul><ul><li>145 devices supports tri band 850/1900/2100 </li></ul></ul><ul><ul><li>100 devices have WLAN </li></ul></ul><ul><ul><li>70% have EDGE </li></ul></ul><ul><li>Whole range of products </li></ul><ul><ul><li>48.8 % in phones/consumer devices </li></ul></ul><ul><ul><li>41.8 % in notebooks/pc modems </li></ul></ul><ul><ul><li>9.4 % in routers </li></ul></ul>
  25. 25. Future Directions Dr. Abhaya Sumanasena
  26. 26. LTE <ul><li>What is LTE: </li></ul><ul><li>The next step in the evolution of 3GPP ( Rel-8 ) radio interfaces to deliver “global mobile </li></ul><ul><li>broadband”. </li></ul><ul><li>LTE is </li></ul><ul><ul><li>more about what user likes to have, about convenience and user experience </li></ul></ul><ul><ul><li>much about broadband and not about voice. Voice is not the driving force for LTE </li></ul></ul><ul><li>Main services provided by LTE: messaging, internet surfing, VoIP </li></ul><ul><li>Performance Targets </li></ul><ul><li>Significantly improved spectrum efficiency and cell edge bitrate whilst maintaining same site locations </li></ul><ul><ul><li>DL target 3-4 times and UL target 2-3 times greater than HSDPA Release 6 </li></ul></ul><ul><li>Reduced CAPEX and OPEX (simple architecture, maximum reuse) resulting in low cost per bit </li></ul><ul><li>Soft handover no longer required and circuit-switched connectivity no longer supported </li></ul><ul><li>MIMO raises the number of users/cell by a factor of 10 compared to UMTS </li></ul><ul><li>Current status of development </li></ul><ul><li>The specifications were approved in September and December 2007. The work on the Layer 1 was closed in March 2008 and open work on core specifications is planned to be finished in 2008. </li></ul><ul><li>NTT DoCoMo and Varizone announced LTE deployments in 2100 MHz and 700 MHz bands by 2010 </li></ul><ul><li>Capabilities </li></ul>Likely LTE deployment scenarios [source: 3gpp] Data rates 2x20 MHz UL: 50 Mbps (peak)/ 20 Mbps (av) DL: 160 Mbps (peak) Latency 10 ms Spectral efficiency Data: DL/UL 2.14/0.9 bps/Hz/cell Voice: DL/UL 45-55 users/MHz/cell Spectrum IMT-2000 bands Bandwidth 1.4, 3, 5,10,15, 20 MHz User Experience 2-5 Mbps, better cell edge performance at lower cost
  27. 27. Regulatory aspects Dr. Abhaya Sumanasena
  28. 28. <ul><li>Principal duty under the Communications Act to further the interests of consumers, where appropriate by promoting competition </li></ul><ul><li>Principal spectrum related duty to secure optimal use of the spectrum and competition between providers </li></ul><ul><li>Three ways to manage the spectrum: </li></ul><ul><ul><li>Command & control . An approach whereby the regulator determines what the spectrum can be used for and who should own it. Changes can only be made with the approval of the regulator. In 2004, this approach was used for over 90% of the spectrum. </li></ul></ul><ul><ul><li>Market forces . Under this approach flexible licenses are provided which allow the licence holder to change the use they put the spectrum to and to sell their licences to others (“liberalisation” and “trading”, respectively). </li></ul></ul><ul><ul><li>Licence exempt . Often termed unlicensed or “spectrum commons”, this approach allows anyone to use the spectrum without a licence as long as their equipment conforms to certain restrictions, normally relatively low transmit power levels. In 2004 around 6% of the spectrum was licence exempt, including the highly successful 2.4GHz band used for WiFi and BlueTooth. </li></ul></ul>Regulatory aspects
  29. 29. Thank you! (please send your feedback abhaya@theiet.org) Dr. Abhaya Sumanasena

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