3.5G(HSDPA) High Speed Downlink Packet Access By Ahmed Al-khaldi Ali bader Al-shaei Hassan Al-hassan
Overview <ul><li>Why HSDPA? </li></ul><ul><li>HSDPA Features </li></ul><ul><ul><li>Hybrid Automatic Repeat Request  </li><...
Why HSDPA? <ul><li>Increasing bit rates in downlink. </li></ul><ul><li>Reducing delay ”TTI”. </li></ul><ul><li>Efficient u...
Why HSDPA ? <ul><li>Comparison Between 3G & 3.5G. </li></ul><ul><ul><ul><ul><li>Data Rate ( 2Mbps -----> 10 Mbps) </li></u...
How HSDPA    HSDPA Features <ul><li>Decreasing delay due to transmission errors  </li></ul><ul><ul><li>Hybrid Automatic R...
H-ARQ Schemes <ul><li>Chase combining </li></ul><ul><li>Incremental Redundancy </li></ul>
Chase Combining <ul><li>Coding is applied to transmission packets </li></ul><ul><li>Soft combining of original and retrans...
Incremental Redundancy <ul><li>Advantage: </li></ul><ul><li>Reducing the effective data throughput/bandwidth of a user and...
How HSDPA    HSDPA Features <ul><li>Decreasing delay due to transmission errors  </li></ul><ul><ul><li>Hybrid Automatic R...
Fast   cell site selection (FCS) <ul><li>20 to 30% of UE on soft handover </li></ul><ul><li>Tracking of active set of Node...
Additional Physical Channels <ul><li>High Speed Physical Downlink Shared Channel (HS-PDSCH) </li></ul><ul><ul><li>HS-Downl...
How HSDPA    HSDPA Features <ul><li>Decreasing delay due to transmission errors  </li></ul><ul><ul><li>Hybrid Automatic R...
AMC <ul><li>Modulation S c hemes: </li></ul><ul><ul><li>QPSK </li></ul></ul><ul><ul><li>16QAM </li></ul></ul><ul><li>Code ...
HSDPA EVOLUTION
HSDPA Terminals <ul><li>New terminals are required to take advantage of HSDPA: </li></ul><ul><ul><li>PC-cards will be the ...
Conclusion <ul><li>The most changing from 3G to the 3.5G is the modulation. </li></ul><ul><li>More efficient implementatio...
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3.5 g(hsdpa)

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3.5 g(hsdpa)

  1. 1. 3.5G(HSDPA) High Speed Downlink Packet Access By Ahmed Al-khaldi Ali bader Al-shaei Hassan Al-hassan
  2. 2. Overview <ul><li>Why HSDPA? </li></ul><ul><li>HSDPA Features </li></ul><ul><ul><li>Hybrid Automatic Repeat Request </li></ul></ul><ul><ul><li>Fast cell site selection </li></ul></ul><ul><ul><li>Adaptive Modulation and Coding </li></ul></ul><ul><li>HSDPA Terminals </li></ul><ul><li>HSDPA evolution </li></ul><ul><li>Conclusion </li></ul>
  3. 3. Why HSDPA? <ul><li>Increasing bit rates in downlink. </li></ul><ul><li>Reducing delay ”TTI”. </li></ul><ul><li>Efficient users scheduling . </li></ul><ul><li>Simultaneaous single carrier support for UMTS and R5 HSDPA </li></ul>
  4. 4. Why HSDPA ? <ul><li>Comparison Between 3G & 3.5G. </li></ul><ul><ul><ul><ul><li>Data Rate ( 2Mbps -----> 10 Mbps) </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Modulation ( QPSK -----> QPSK&16QAM) </li></ul></ul></ul></ul><ul><ul><ul><ul><li>TTI( 10ms ----> 2ms ) </li></ul></ul></ul></ul>
  5. 5. How HSDPA  HSDPA Features <ul><li>Decreasing delay due to transmission errors </li></ul><ul><ul><li>Hybrid Automatic Repeat Request </li></ul></ul>
  6. 6. H-ARQ Schemes <ul><li>Chase combining </li></ul><ul><li>Incremental Redundancy </li></ul>
  7. 7. Chase Combining <ul><li>Coding is applied to transmission packets </li></ul><ul><li>Soft combining of original and retransmitted signals is done at receiver before decoding </li></ul><ul><li>Advantage: </li></ul><ul><li>self decodable, time diversity, path diversity </li></ul><ul><li>Disadvantage: </li></ul><ul><li>wastage of bandwidth </li></ul>Data Block Retransmissions Block Combine <ul><li>Accept </li></ul><ul><li>Data Block </li></ul>
  8. 8. Incremental Redundancy <ul><li>Advantage: </li></ul><ul><li>Reducing the effective data throughput/bandwidth of a user and using this for another user </li></ul><ul><li>Disadvantage: </li></ul><ul><li>non-self decodable </li></ul>Data Block Information from IR database Combine <ul><li>Error Detection </li></ul>IR Database Accept Data Block Error No Error Deliver To Upper Layers
  9. 9. How HSDPA  HSDPA Features <ul><li>Decreasing delay due to transmission errors </li></ul><ul><ul><li>Hybrid Automatic Repeat Request </li></ul></ul><ul><li>Decreasing HO failure </li></ul><ul><ul><li>Fast cell site selection </li></ul></ul>
  10. 10. Fast cell site selection (FCS) <ul><li>20 to 30% of UE on soft handover </li></ul><ul><li>Tracking of active set of Node B‘s connected to a UE </li></ul><ul><li>Selection of the Node-B with the best current transmission characteristics </li></ul><ul><li>High data rates can be achieved </li></ul>
  11. 11. Additional Physical Channels <ul><li>High Speed Physical Downlink Shared Channel (HS-PDSCH) </li></ul><ul><ul><li>HS-Downlink Shared Channel (HS-DSCH) </li></ul></ul><ul><ul><li>HS-Shared Control Channel (HS-SCCH) </li></ul></ul><ul><li>High Speed Dedicated Physical Control Channel (HS-DPCCH) </li></ul>
  12. 12. How HSDPA  HSDPA Features <ul><li>Decreasing delay due to transmission errors </li></ul><ul><ul><li>Hybrid Automatic Repeat Request </li></ul></ul><ul><li>Decreasing HO failure </li></ul><ul><ul><li>Fast cell site selection </li></ul></ul><ul><li>Improving resources management </li></ul><ul><ul><li>Stand alone downlink shared channel </li></ul></ul><ul><li>Adapting to environment local features </li></ul><ul><ul><li>Adaptive Modulation and Coding </li></ul></ul>
  13. 13. AMC <ul><li>Modulation S c hemes: </li></ul><ul><ul><li>QPSK </li></ul></ul><ul><ul><li>16QAM </li></ul></ul><ul><li>Code Rates used: </li></ul><ul><ul><li>1/4, 1/2, 5/8 and ¾ </li></ul></ul>
  14. 14. HSDPA EVOLUTION
  15. 15. HSDPA Terminals <ul><li>New terminals are required to take advantage of HSDPA: </li></ul><ul><ul><li>PC-cards will be the first on the market </li></ul></ul><ul><ul><li>In the 1st phase terminals will offer: </li></ul></ul><ul><ul><ul><li>Download 3,6 Mbps end user throughput </li></ul></ul></ul><ul><ul><ul><li>Upload 384 kbps </li></ul></ul></ul><ul><ul><li>Hand-held terminals will follow </li></ul></ul><ul><ul><li>In a 2nd phase, peak data rates are increased to: </li></ul></ul><ul><ul><ul><li>Download 14 Mbps </li></ul></ul></ul><ul><ul><ul><li>Upload 384 kbps </li></ul></ul></ul>
  16. 16. Conclusion <ul><li>The most changing from 3G to the 3.5G is the modulation. </li></ul><ul><li>More efficient implementation of interactive and background Quality of Service (QoS) classes </li></ul><ul><li>Peak data rates exceeding 2 Mbps and theoretically 10 Mbps & more with MIMO </li></ul>

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