11_UMTS-HSDPA_ws11
Short Description
hsdpa...
Description
High-Speed Downlink Packet Access (HSDPA)
HSDPA Background & Basics Principles: Adaptive Modulation, Coding, HARQ Channels/ UTRAN Architecture Principles: Fast scheduling, Mobility Performance Results
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Motivation (as of 2000)
Voice, low speed packet data
Medium rate Packet data
GSM/GPRS
UMTS Rel. 99
No Multimedia, Limited QOS
Theoretical 2 Mbps but ~384 kbps subjected to practical constraints
As the UMTS networks are rolled rol led out, the demand dema nd for high bandwidth services is expected to grow rapidly. By 2010, 66% of the revenues will come from data services (source: UMTS forum).
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HSDPA Background
Initial goals Establish a more spectral efficient way of using DL resources providing data rates beyond 2 Mbit/s, (up to a maximum theoretical limit of 14.4 Mbps) Optimize interactive & background packet data traffic, support streaming service Design for low mobility environment, but not restricted Techniques compatible with advanced multi-antenna and receiver receiverss
Standardization started in June 2000 Broad forum of companies Major feature of Release 5
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HSDPA Basics
Evolution from R99/ R4 5MHz BW Same spreading by OVSF and scrambling codes Turbo coding
New concepts in R5 Adaptive modulation (QPSK vs. 16QAM), coding and multicodes (fixed SF = 16) Fast scheduling in NodeB (TTI = 2ms) Hybrid ARQ
Enhancements in R7 HSPA+
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Higher Order Modulation
Standard modulation scheme in UMTS networks 2 bit per symbol QPSK With HSDPA, modulation can be switched between two schemes QPSK 2 bit per symbol 16-QAM 4 bit per symbol
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Key Principles
Adaptive Modulation and a nd Coding (Mother Turbo code rate = 1/3) For wireless data, link adaptation through Rate Control is more effec ef fecti tive ve th then en Powe Powerr Cont Control rol.. Users in favorable channel conditions (based (based on Channel Quality indication)) are assigned higher code rates and higher order indication modulation (16QAM). This means higher data rates = Reduced latency
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Hybrid ARQ
No.. In fast fading conditions, AMC alone is not enough. No
H-ARQ automatically adapts to instantaneo instantaneous us channel conditions by: fast retransmissions at physical layer
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Fast Scheduling
Fading is good in multiuser environment!! Channels are uncorrelated
Multi-user
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HS-DSCH Principle I
Channelization codes at a fixed spreading factor of SF = 16 Up to 15 codes in parallel
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HS-DSCH Principle II
Resource sharing in code as well as time domain: Multi-code transmission, UE is assigned to multiple codes in the same T TI Multiple UEs may be assigned channelization codes in the same TTI T TI
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UMTS Channels with HSDPA
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HS-DSCH Serving Cell Change
Measurement quantity CPICH 1
Hysteresis
CPICH 2
CPICH3
Time to trigger
Time
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Handover Procedure
Target HS-DSCH cell
UE
Source HS-DSCH cell
SRNC = DRNC
Serving HS-DSCH cell change decision i.e. event 1D
RL Reconfiguration Prepare RL Reconfiguration Ready ALCAP Iub HS-DSCH Data Transport Bearer Setup
If new NodeB
RL Reconfiguration Prepare RL Reconfiguration Ready
Radio Bearer Reconfiguration
RL Reconfiguration Commit
RL Reconfiguration Commit
Synchronous Reconfiguration with Tactivation Reset MAChs entity
Radio Bearer Reconfiguration Complete
DATA
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HSDPA HSDP A – Man Manag aged ed Resourc Resources es
a) OVSF Code Tree
Border adjusted by CRNC
SF=2 SF=4 SF=8
C16,15
C16,0
SF=16
Codes reserved for HS-PDSCH/ HS-SCCH b) Transmit Power Border adjusted by CRNC
Codes available for DCH/ common channels
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Cell and User Throughput vs. Load
36 cells network UMTS composite channel model FTP traffic model (2 Mbyte download, 30 sec thinking time)
Load Impact 2500 Mean User Throughput Aggregated Cell Throughput Throughput ] 2000 c e s / t i b1500 k [ t u p h1000 g u o r h T 500
0
The user throughput is decreased when increasing load due to the reduced service time
The cell throughpu throughputt increases with the load because overall more bytes are transferred in the
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HSDPA Performance per Category
36 cells network UMTS composite channel model FTP traffic model (2 Mbyte download, 30 sec thinking time)
Cat 6 - Cat 8 Comparison 2500
Mean User Throughput Peak User Throughput Aggregated Cell Throughput Throughput
2000 ) s p b 1500 k ( t u p h g u o r 1000 h t
Higher category offers higher max. throughput limit Cat.6: 3.6 MBit/sec Cat.8: 7.2 MBit/sec
Max. user perceived performance increased at low loading
500
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Coverage Prediction with HSDPA
Example Scenario
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HSDPA Summary
New downlink transmission concept Optimised for interactive & background, support of streaming Design for indoor & urban environment Improved PHY approach New DL transport channel: HS-DSCH
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HSDPA References
Papers: Arnab Das et al: “Evolution of UMTS Toward Toward High-Speed Downlink Packet Access,” Bell Labs Technical Journal, Journal, vol. 7, no. 3, pp. 47 – 68, June 2003 A. Toskala et al: “High-speed Downlink Packet Access,” Chapter Chapter 12 in
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Abbreviations ACK ALCAP AM AMC C AC CDMA
(positive) Acknowledgement Acknowledgement Access Link Control Application Application Protocol Acknowledged (RLC) Mode Adaptive Modulation & Coding Coding Call Admission Control Code Di i ion M ltiple A e
IE MAC-d MAC-hs Mux NACK NBAP OVSF
Information Element dedicated Me Medium Ac Access Co Control hig hi ghh-sspeed Medium Access Contro roll Multiplexing Negative Ac Acknowledgement NodeB Application Part O th l V i bl SF ( d )
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