4G Mobile Systems


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4G Mobile Systems

  2. 2. CONTENTS•Introduction•What is 4G?•Evolution of 4G•A look at fundamental requirements•Evolution of processors and DSP Technology for 4G•The 3G•The 4G
  3. 3. CONTENTS:• 3G:Some unfinished Business• 4G Wireless: one view• Path Losses And fading challenge• Which countries have 4G?• Infrastructure for 4G• 4G in India
  4. 4. • 4G, the successor of 3G, will soon become the standard for cellular wireless• The technology is currently available in some countries but it is still being perfected• The aim is to achieve “ultra broadband speed” – to be counted in gigabytes per second
  5. 5. • 4G is short for Fourth (4th) Generation Technology. It is basically the extension in the 3G technology with more bandwidth and services offers in the 3G.• Will allow users to download a full-length feature film within five minutes• Will also be able to stream high-definition television and radio to hand-held devices• The basic difference between 3G and 4G is in data transfer and signal quality
  6. 6. • The highest download and upload speed in 3G are 14 Mbps and 5.8 Mbps respectively• In 4G the download speed is up to 100 Mbps for moving users and 1 Gbps for stationary users• 4G is adoption of packet switching instead of circuit switching in voice and video calls• With packet switching, resources are only used when there is information to be sent across• 4G uses spiral multiplexing
  7. 7. • The first commercial deployment was by Telia Sonera and NetCom• Telia Sonera branded the network “4G”• The modem devices on offer were manufactured by Samsung (dongle GT-B3710)• The network infrastructure were created by Huawei (in Oslo) and Ericsson (in Stockholm)
  8. 8. A Look at FundamentalRequirements Human Sense Sound Sight Knowledge↓ Network Generation 1G-2G Voice - Low Speed Data 3G Voice Images Hypertext (HT) Files (Speech, HT, 4G Voice, Speech Video Video) Typical Bandwidth 10-80 Kbps 1 - 20 Mbps 0.5-10 Mbps Required Latency <160 ms <100 ms <5 s Principal Application Communication Entertainment Information
  9. 9. The 3GLarge CoverageOutdoor - High MobilityUp to 14Mbps
  10. 10. The 4G Macro Cells Pico Cells Isolated HotSpots – 1Gbps Coverage Indoor – Very Low Mobility Large Coverage – 100Mbps Coverage Outdoor - High Mobility• What we need o Adaptive high performance transmission system o Great candidate for SDR
  11. 11. 3G: Some Unfinished BusinessTechnical Financial• Improved coverage • Balance sheet cleanup (e.g., residences) (debt reduction)• Inter technology roaming • Capacity Utilization• Inter carrier compensation • Business Models for (esp. data services) New Services
  12. 12. 4G Wireless: One View• 4G WOFDM high speed downlink “a wireless cable modem”• Complement to EDGE/UMTS• High peak data rates (up to 10 Mb/s) in a 5 MHz channel• spectrum - 500 MHz to 3 GHz• 3G EDGE/WCDMA network for uplink, downlink, control and signalling
  13. 13. Path Loss and Fading Challenge Reflected signals Delay arrive spread Spread out over 5 to 20 Path microsecond Loss path loss up to ~ 150 dB (that is a 1 followed by 15 zeroes) Rayleigh Fading rapid fading of 20 to 30 dB (power varies by 100 to 1000 times in level at rates of about 100 times per second)
  14. 14. • Except for the Scandinavian countries, a few countries have started the 4G commercially• In the US, Sprint Nextel initiated the service last year• Countries expected to launch 4G by this year are Germany, Spain, China, Japan and England
  15. 15. • There are three primary technologies that support 4G – WiMax, LTE, and UMB• The main doubt is whether to implement WiMax or LTE • The advantages of LTE are:(i) Faster speed with 100 Mbps for downloadand 50 Mbps for upload(ii) It makes CDMA and GSM database moot(iii) It offers both FDD and TDD duplexing
  16. 16. • Has already begun the process of introducing 4G• India is among the latecomers in 3G• It is felt that by the time the implement 3G fully, 4G technologies such as LTE will be available commercially• It has taken three years for the government to decide on 3G-spectrum auction policy• 4G could face the same delay unless India wants to catch up with the rest of the world
  17. 17. THANK U &QUERIES ? ?