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3.5GHSDPA

Overview. Why HSDPA?HSDPA FeaturesHybrid Automatic Repeat Request Fast cell site selection Adaptive Modulation and CodingHSDPA TerminalsHSDPA evolutionConclusion. Why HSDPA?. Increasing bit rates in downlink.Reducing delay "TTI".Efficient users scheduling.Simultaneaous single carrier support for UMTS and R5 HSDPA.

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3.5GHSDPA

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    1. 3.5G(HSDPA) High Speed Downlink Packet Access By Ahmed Al-khaldi Ali bader Al-shaei Hassan Al-hassan

    2. Overview Why HSDPA? HSDPA Features Hybrid Automatic Repeat Request Fast cell site selection Adaptive Modulation and Coding HSDPA Terminals HSDPA evolution Conclusion

    3. Why HSDPA? Increasing bit rates in downlink. Reducing delay ”TTI”. Efficient users scheduling. Simultaneaous single carrier support for UMTS and R5 HSDPA

    4. Why HSDPA? Comparison Between 3G & 3.5G. Data Rate ( 2Mbps -----> 10 Mbps) Modulation ( QPSK -----> QPSK&16QAM) TTI( 10ms ----> 2ms )

    5. How HSDPA ? HSDPA Features Decreasing delay due to transmission errors Hybrid Automatic Repeat Request

    6. H-ARQ Schemes Chase combining Incremental Redundancy

    7. Chase Combining Coding is applied to transmission packets Soft combining of original and retransmitted signals is done at receiver before decoding Advantage: self decodable, time diversity, path diversity Disadvantage: wastage of bandwidth

    8. Incremental Redundancy Advantage: Reducing the effective data throughput/bandwidth of a user and using this for another user Disadvantage: non-self decodable

    9. How HSDPA ? HSDPA Features Decreasing delay due to transmission errors Hybrid Automatic Repeat Request Decreasing HO failure Fast cell site selection

    10. Fast cell site selection (FCS) 20 to 30% of UE on soft handover Tracking of active set of Node B‘s connected to a UE Selection of the Node-B with the best current transmission characteristics High data rates can be achieved

    11. Additional Physical Channels High Speed Physical Downlink Shared Channel (HS-PDSCH) HS-Downlink Shared Channel (HS-DSCH) HS-Shared Control Channel (HS-SCCH) High Speed Dedicated Physical Control Channel (HS-DPCCH)

    12. How HSDPA ? HSDPA Features Decreasing delay due to transmission errors Hybrid Automatic Repeat Request Decreasing HO failure Fast cell site selection Improving resources management Stand alone downlink shared channel Adapting to environment local features Adaptive Modulation and Coding

    13. AMC Modulation Schemes: QPSK 16QAM Code Rates used: 1/4, 1/2, 5/8 and ¾

    14. HSDPA EVOLUTION

    15. HSDPA Terminals New terminals are required to take advantage of HSDPA: PC-cards will be the first on the market In the 1st phase terminals will offer: Download 3,6 Mbps end user throughput Upload 384 kbps Hand-held terminals will follow In a 2nd phase, peak data rates are increased to: Download 14 Mbps Upload 384 kbps

    16. Conclusion The most changing from 3G to the 3.5G is the modulation. More efficient implementation of interactive and background Quality of Service (QoS) classes Peak data rates exceeding 2 Mbps and theoretically 10 Mbps & more with MIMO

    17. Any questions ?

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