Huawei 2008 W-CDMA (UMTS) HSDPA RRM and parameters -- how to make HSDPA work better (very good)
HSDPA Speeding Up UMTS
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Transcript of HSDPA Speeding Up UMTS
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1HSDPA: Speeding-Up Wireless Data in Practice
Andrea Garavaglia and Matthias SchulistQUALCOMM
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2 Q U A L C O M M C O N F I D E N T I A L & P R O P R I E T A R Y
Outline
QUALCOMM Engineering Services
High Speed Downlink Packet Access (HSDPA)
HSDPA Performance Throughput Latency
Advanced HSDPA Performance
Outlook: HSUPA
Conclusions
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3 Q U A L C O M M C O N F I D E N T I A L & P R O P R I E T A R Y
QUALCOMM Engineering Services
ESGLocations:San Diego | NrnbergIndia | Hong Kong | South Africa | Middle East
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4 Q U A L C O M M C O N F I D E N T I A L & P R O P R I E T A R Y
Service AreasAssisting in network deployment, optimization & evolution
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5 Q U A L C O M M C O N F I D E N T I A L & P R O P R I E T A R Y
Release 99 and HSDPA Data Channels
Low
Good
Not supported
None or slow (based on measurement
reports)
Common
FACH
HighMediumData Rate
Very GoodPoorSuitability for Bursty Data
Not supported(for HS channels)SupportedSoft Handover
(None)
Fast link adaptation
Closed inner loop at 1500 Hz slow
outer loopPower Control
SharedDedicatedChannel Type
HSDPADCHMode
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6 Q U A L C O M M C O N F I D E N T I A L & P R O P R I E T A R Y
HSDPA UTRAN Functionalities
RELEASE 5 (HSDPA)RLC ARQ
RELEASE 5 (HSDPA)SchedulingLink AdaptationH-ARQResource Allocation
RELEASE 99SchedulingRLC ARQResource Allocation
RELEASE 5 (HSDPA)RLC ARQRELEASE 5 (HSDPA)RLC ARQ
RELEASE 5 (HSDPA)SchedulingLink AdaptationH-ARQResource Allocation
RELEASE 5 (HSDPA)SchedulingLink AdaptationH-ARQResource Allocation
RELEASE 99SchedulingRLC ARQResource Allocation
RELEASE 99SchedulingRLC ARQResource Allocation
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7 Q U A L C O M M C O N F I D E N T I A L & P R O P R I E T A R Y
HSDPA Throughput Performance: Cat. 12
1410
1455
1600
1720
1815
0 200 400 600 800 1000 1200 1400 1600 1800 2000
Throughput [kbps]
Max. L1 Data Rate (3GPP)
Max. L1 Data Rate (Vendor)
RLC Throughput without SBLER
RLC Throughput with SBLER
TCP/IP Throughput with SBLER
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8 Q U A L C O M M C O N F I D E N T I A L & P R O P R I E T A R Y
HSDPA Latency Performance
208 ms240 msMininum RTT10*20ms=200ms10*20ms=200msUL delay64kbps RAB64kbps RABUL bearer4*2ms=8ms4*10ms=40msDL delay4 TBS 3440384kbps RABDL bearer1520 bytes62 ms120 msMininum RTT3*20ms=60ms3*20ms=60msUL delay64kbps RAB64kbps RABUL bearer1*2ms=2ms3*20ms=60msDL delay1 TBS 344064kbps RABDL bearer
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9 Q U A L C O M M C O N F I D E N T I A L & P R O P R I E T A R Y
HSDPA and Advanced Performance
Higher Capability UE (16-QAM) 3.6 Mbps with 5 SF 16 HS-PDSCH codes Cat. 6 UE
Advanced Receiver Techniques Receive Diversity
Inter-cell interference dominated scenarios Low geometries (far-field, cell edge) Antenna and diversity gains
Equalizer Intra-cell, multi-path interference dominated scenarios High geometries (nearfield) Flattens received spectrum
Combined types
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10 Q U A L C O M M C O N F I D E N T I A L & P R O P R I E T A R Y
Advanced HSDPA Throughput Performance: Basic Aspects
1410
1455
1600
1720
1815
2961
3055
3360
3584
3649
5921
6109
6720
7078
7206
0 1000 2000 3000 4000 5000 6000 7000 8000
Throughput [kbps]
7.0783.5841.720Max. Ph. Layer Thpt. [Mbps]
1415571683440Max. TBS used
QPSK &16-QAM
QPSK &16-QAM
QPSKModulation
1055# HS-PDSCH codes
Cat 8Cat 6Cat 12ParameterMax. L1 Data Rate (3GPP)
RLC Throughput with SBLER
TCP/IP Throughput with SBLER
Max. L1 Data Rate (Vendor)
RLC Throughput without SBLER
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11 Q U A L C O M M C O N F I D E N T I A L & P R O P R I E T A R Y
Advanced HSDPA Throughput Performance: Throughput Gains
1.31
1.08
1.13
2.97
2.23
Cat 6 (Eq.)
57%0.690.59Multi-user
64%0.690.59Single User
45%2.051.50Multi-user
Mid/Far Cell
Mobility
Stationary
Scenario
FTP Throughput [Mbps]
Near Cell
Condition
Single User
Single User
User
0.80
1.39
Cat 12 (Rake)
0.90
1.78
Cat 6 (Rake)
46%
25%
GainEq. vs. Rake
Gains depend on structure of interference CQI gains do not directly transfer into throughput gains
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12 Q U A L C O M M C O N F I D E N T I A L & P R O P R I E T A R Y
Advanced HSDPA Throughput Performance: CQI Gains
0 . 0 0
0 . 0 5
0 . 1 0
0 . 1 5
0 . 2 0
0 . 2 5
0 2 4 6 8 1 0 1 2 1 4 1 6 1 8 2 0 2 2 2 4 2 6 2 8 3 0C Q I
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E q - P D F C a t 6 R a k e - P D F E q - C D F C a t 6 R a k e - C D F "
Median CQI improves to 20.3 with Eq. from 17.4 with Rake
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0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30CQI [points]
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QPSK 16-QAM
62%
41%
22%
72%0
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0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30CQI [points]
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QPSK 16-QAM
62%
41%
22%
72%
Gains limited for Cat.6 at high CQI
Same CQI gain leads to higher relative throughput gain towards lower CQI values (i.e. worse RF conditions)
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13 Q U A L C O M M C O N F I D E N T I A L & P R O P R I E T A R Y
Advanced HSDPA Throughput Performance: 16-QAM Utilization
16-QAM utilization increased from 33.4% with Rake to 69.5% with Equalizer
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14 Q U A L C O M M C O N F I D E N T I A L & P R O P R I E T A R Y
Outlook: HSUPA (Release 6)
Fast Node-B SchedulerMany-to-One
Rise-over-Thermal (RoT)
Fast Node-B SchedulerOne-to-Many
Shared Node-B Power and Code
Fast Power ControlSoft Handover
Rate/Modulation AdaptationSingle Serving Cell
HARQ with Fast Retransmission at Layer 1
Dedicated Channel with Enhanced Capabilities
New high-speedShared Channel
HSUPAHSDPA
UL data rate up to 5.76 Mbps (physical layer) TTI of 10 ms and 2 ms (later deployments) Uplink interference control most critical, sophisticated Grant concept
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15 Q U A L C O M M C O N F I D E N T I A L & P R O P R I E T A R Y
Conclusions
HSDPA boosts the data experience in 3G
Advanced UE receivers required to fully exploit HSDPA capabilities HSUPA to further improve uplink and overall latencies (TTI=2 ms)
HSDPA is now and (almost) everywhere 3.6 Mbps rolled out First commercial deployment of 7.2 Mbps
First commercial deployments of HSUPA
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16 Q U A L C O M M C O N F I D E N T I A L & P R O P R I E T A R Y
THANK YOU!!
Questions & Answers