1. 1 HSDPA Overview By: Syed Asif Hussain Shah Mohammad Reza Akhavan 10th March, 2005 Networking Project

2. 2 Agenda High Speed Downlink Packet Access (HSDPA) Major work item for Release 5 in 3GPP HSDPA provides impressive enhancements over WCDMA for the downlink WCDMA 2 Mbps  HSDPA 14 Mbps (with MIMO ~ 20) UMTS network architecture

3. 3 UMTS Network Architecture UMTS = Universal Mobile Telecommunications System UTRAN = UMTS Terrestrial Radio Access Network UE = User Equipment RNC = Radio Network Controller RNS = Radio Network Subsystem (RNC & Bs) SGSN = Serving GPRS Service Node GGSN = Gateway GPRS Service Node RNC GGSN SGSN UTRAN Core Network UE Uu Iur Iub Iu PS Node B IP Networks Gi Gn

4. 4 HSDPA features... Reduction of information frame Feedback of reception quality (CQI) Adding new features: 3 Channels HARQ AMC MIMO FCS

5. 5 HSDPA 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) HS-DPCCH, ACK, NACK HS-DPCCH: CQI HS-SCCH DL Transfer Information HS-DSCH Data Transfer

6. 6 HS - Downlink Shared Channel (HS-DSCH) Shared channel transmission

7. 7 AMC Adaptive Modulation & Coding Modulation & coding depends on channel quality condition Modulation Schemes: QPSK 16QAM Different Code Rates used

8. 8 H-ARQ Hybrid – Auto Repeat reQuest Provide Link Layer Retransmissions Moved From RNC to Node-B Use two Schemes Chase Combing and Incremental Redundancy

9. 9 Is based on multipath environment Used just in downlink Used in further away from the base station MIMO Multiple Input Multiple Output

10. 10 Fast cell site selection (FCS) Tracking of active set of Node B‘s connected to a UE Operate by monitoring SIR (Signal-to-Interference Rate) level of all Bs Selection of the Node-B with the best current transmission characteristics High data rates can be achieved

11. 11 Any Questions & Comments ? ?