All Possible Contents about High Speed Downlink Packet Access

1. Seminar OnSeminar On
HSDPA(3.5G)&MBMSHSDPA(3.5G)&MBMS
Presented ByPresented By
AKSHAY WAGHAKSHAY WAGH
Guided ByGuided By
Ms. Vidya NikamMs. Vidya Nikam

2. OverviewOverview
 IntroductionIntroduction
 HSDPAHSDPA
 MBMSMBMS
 HSDPA FeaturesHSDPA Features
• Hybrid Automatic Repeat RequestHybrid Automatic Repeat Request
• Fast cell site selectionFast cell site selection
• Adaptive Modulation and CodingAdaptive Modulation and Coding
 HSDPA evolutionHSDPA evolution
 HSDPA TerminalsHSDPA Terminals
 ConclusionConclusion
 ReferencesReferences

3. IntroductionIntroduction
 After slow start of 3g network it is now deployed on broad-After slow start of 3g network it is now deployed on broad-
scale and it provide multimedia services to users.scale and it provide multimedia services to users.
 To meet increasing demand of high speed the 3g networkTo meet increasing demand of high speed the 3g network
enhanced with HSDPA which support higher peak data rate.enhanced with HSDPA which support higher peak data rate.
 Further for multiuser environment 3g enhanced with MBMS.Further for multiuser environment 3g enhanced with MBMS.

4. What Is HSDPA?What Is HSDPA?
 High-Speed Downlink Packet Access (HSDPA) is anHigh-Speed Downlink Packet Access (HSDPA) is an
enhanced 3G (third generation) mobile telephonyenhanced 3G (third generation) mobile telephony
communications protocol.communications protocol.
 Also dubbed 3.5G, 3G+ or turbo 3G, which allows networksAlso dubbed 3.5G, 3G+ or turbo 3G, which allows networks
based on Universal Mobile Telecommunications Systembased on Universal Mobile Telecommunications System
(UMTS) to have higher data transfer speeds and capacity.(UMTS) to have higher data transfer speeds and capacity.

5. Why HSDPA?Why HSDPA?
 Increasing bit rates in downlink.Increasing bit rates in downlink.
 Reducing delay ”TTI”.Reducing delay ”TTI”.
 Efficient users schedulingEfficient users scheduling..
 Increasing bit rates in uplink(Increasing bit rates in uplink(384 kbit/s.)384 kbit/s.)
 Reducing Round Trip Timing(RTT)Reducing Round Trip Timing(RTT)

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

7. Multimedia Broadcast/Multicast ServiceMultimedia Broadcast/Multicast Service
(MBMS)(MBMS)
 Broadcast and Multicast are methods for transmitting data packetsBroadcast and Multicast are methods for transmitting data packets
from a single source to several destinations (point-to-multipoint).from a single source to several destinations (point-to-multipoint).
 Service definition: A unidirectional point-to-multipoint service inService definition: A unidirectional point-to-multipoint service in
which data is transmitted from a single source entity to a group ofwhich data is transmitted from a single source entity to a group of
users in a specific area.users in a specific area.
 Benefits:Benefits:
• Multiple users can receive the same data at the same time.Multiple users can receive the same data at the same time.
• Better radio resource utilization for the wireless operator.Better radio resource utilization for the wireless operator.
• High bandwidth applications support.High bandwidth applications support.
 MBMS supports 2 modesMBMS supports 2 modes
• Broadcast modeBroadcast mode
• Multicast mode.Multicast mode.

8. MBMS modesMBMS modes
• Broadcast ModeBroadcast Mode
– unidirectional point-to-unidirectional point-to-
multipoint transmission ofmultipoint transmission of
multimedia data (e.g. text,multimedia data (e.g. text,
audio, picture, video)audio, picture, video)
– The broadcast mode isThe broadcast mode is
intended to efficiently useintended to efficiently use
radio/network resources e.g.radio/network resources e.g.
data is transmitted over adata is transmitted over a
common radio channel.common radio channel.
– Data is transmitted in theData is transmitted in the
broadcast service area asbroadcast service area as
defined by the networkdefined by the network
(Home environment).(Home environment).
• Multicast ModeMulticast Mode
– The multicast mode allows theThe multicast mode allows the
unidirectional point-to-unidirectional point-to-
multipoint transmission ofmultipoint transmission of
multimedia data (e.g. text,multimedia data (e.g. text,
audio, picture, video) from aaudio, picture, video) from a
single source point to asingle source point to a
multicast group in a multicastmulticast group in a multicast
service area.service area.
– Network to selectivelyNetwork to selectively
transmit to cells within thetransmit to cells within the
multicast service area whichmulticast service area which
contain members of acontain members of a
multicast group.multicast group.

9. HSDPA FeaturesHSDPA Features
Hybrid Automatic Repeat RequestHybrid Automatic Repeat Request

10. H-ARQ SchemesH-ARQ Schemes
 Chase combining(Identical Retransmission)Chase combining(Identical Retransmission)
 Incremental Redundancy(Non-IdenticalIncremental Redundancy(Non-Identical
Retransmission)Retransmission)

11. Chase CombiningChase Combining
Data Block
Retransmissions
Block
Combine Accept
Data
Block
 Coding is applied to transmission packets
 Soft combining of original and retransmitted signals is done
at receiver before decoding
 Advantage:
self decodable, time diversity
 Disadvantage:
wastage of bandwidth

12. Incremental Redundancy
 Advantage:
Reducing the effective data throughput/bandwidth of a user and
using this for another user
 Disadvantage:
non-self decodable
Data Block
Information from
IR database
Combine
Error
Detection
IR Database
Accept
Data Block
Error
No Error
Deliver
To Upper
Layers

13. HSDPA FeaturesHSDPA Features
Fast cell site selectionFast cell site selection

14. FastFast cell site selection (FCS)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

15. 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)

16. General ProcedureGeneral Procedure

17. HSDPA FeaturesHSDPA Features
Adaptive Modulation and CodingAdaptive Modulation and Coding

18. AMCAMC
 Modulation Schemes:
• QPSK
• 16QAM

19. HSDPA EVOLUTIONHSDPA EVOLUTION

20. 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

21. ConclusionConclusion
 The most changing from 3G to the 3.5G is the modulation.The most changing from 3G to the 3.5G is the modulation.
 More efficient implementation of interactive and backgroundMore efficient implementation of interactive and background
Quality of Service (QOS) classesQuality of Service (QOS) classes
 Peak data rates exceeding 2 Mbps and theoretically 10 MbpsPeak data rates exceeding 2 Mbps and theoretically 10 Mbps
& more with MIMO& more with MIMO

22. ReferencesReferences
 http://www.telenor.hu/en/internet/coverage/http://www.telenor.hu/en/internet/coverage/
 HSDPA in W-CDMAHSDPA in W-CDMA http://www.umtsworld.com/technology/hsdpa.htmlhttp://www.umtsworld.com/technology/hsdpa.html
 http://www.nomor.de/home/technology/white-papers/technology-of-high-http://www.nomor.de/home/technology/white-papers/technology-of-high-
speed-packet-access-hspaspeed-packet-access-hspa
 IEEE TRANSACTIONS ON BROADCASTING, VOL. 55, NO. 4,IEEE TRANSACTIONS ON BROADCASTING, VOL. 55, NO. 4,
DECEMBER 2009DECEMBER 2009
 http://en.wikipedia.org/hsdpa.htmlhttp://en.wikipedia.org/hsdpa.html

23. Thank YouThank You