hsdpa v1 cu english jsmcc

8/13/2019 Hsdpa v1 Cu English Jsmcc

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1 NOKIA WCDMA Radio Network Planning.ppt 3G WCDMA

HSDPA Network Planning


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Content HSDPA introduction HSDPA Planning HSDPA system performance

Application Performance


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HSDPA IntroductionHSDPA High Speed Downlink Packet Access


4/694 NOKIA WCDMA Radio Network Planning.ppt 3G WCDMA

HSDPA usageThe High Speed Downlink Packet Access (HSDPA) concept is a

natural extension of the Downlink Shared Channel (DSCH).

HSDPA is mainly intended for non-realtime traffic, but canalso be used for traffic with tighter delay requirements.

Conversational

Streaming

Background

Interactive

Realtime

traffic (RT)

Non-realtimetraffic (NRT)

HSDPA



Release 99 DL capabilities DL packet traffic in R99 of WCDMA

DCH transmitted on DPCH

Fixed SF (SF determines the channelisation code).Power controlled, support for SHO, highest rate 2 Mbps.

DSCH transmitted on PDSCH

Variable SF.

Always DCH associated.

DSCH is shared by several users (single or multi-code transmission).

Power controlled (DPCCH), no support for SHO.

DSCH will be removed from Rel5 onwards.

FACH transmitted on S-CCPCH

Fixed SF.

No power controlled (relatively high power), no support for SHO.



Physical Channels for One HSDPA UE(HSDPA High Speed Downlink Packet Access)

UE

BTS

Associat

ed

DPCH

Associated

DPCH

1-

15

xH

S-

PDSCH

1-

4

xH

S-

SCCH

HS-D

PCCH

DL CHANNELS HS-PDSCH: High-Speed PhysicalDownlink Shared Channel

HS-SCCH: High-Speed Shared Control

Channel Associated DPCH, Dedicated PhysicalChannel.

UL CHANNELS

Associated DPCH, Dedicated Physical

Channel HS-DPCCH: High-Speed DedicatedPhysical Control Channel



UE2

Channel quality(CQI, Ack/Nack, TPC)

Channel quality(CQI, Ack/Nack, TPC)

Data

DataNew base station functions HARQ retransmissions Modulation/coding selection Packet data scheduling (short TTI)

New base station functions HARQ retransmissions Modulation/coding selection Packet data scheduling (short TTI)

UE1

0 20 40 60 80 100 120 140 160

-2

0

24

6

8

10

1214

16

Time [number of TTIs]

QPSK1/4

QPSK2/4

QPSK3/4

16QAM2/4

16QAM3/4

InstantaneousEsNo[dB]

HSDPA - general principle

AMC:Adaptive Modulation and Coding

H-ARQ:Hybrid Automatic Repeat reQuest



HSDPA Components Features

HSDPA

AMC

MIMO ?

Short Frame Size(TTI=2 ms)

FastPacket Scheduling

H-ARQ

AMC:Adaptive Modulation and Coding

H-ARQ:Hybrid Automatic Repeat reQuest



HSDPA Protocol Architecture New MAC entity, MAC-hs added to the Node B Layers above, such as RLC, unchanged.

WCDMA L1

UE

Iub /Iur

SRNCNode B

Uu

MAC-hs

RLC

NAS

HSDPA user plane

WCDMA L1

MAC -hs

TRANSPORT

FRAME

PROTOCOL

TRANSPORT

FRAME

PROTOCOL

MAC -dRLC

Iu



New Node B functionality for HSDPATerminalsNode BRNC

PacketsScheduler

& Buffer

ARQ &

Coding

ACK/NACK & FeedbackDecoding

Flow Control

New Node B functions: Scheduler: Terminal scheduling, Coding Modulation selection (16QAMas new modulation) ARQ Retransmissions Handling Uplink Feedback Decoding Flow Control towards SRNC


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New terminal functionality for HSDPATerminalNode BRNC

PacketsARQ

Decoding

Soft Buffer

& Combining

ACK/NACK & FeedbackGeneration

Flow Control

New terminal functions: 16 QAM demodulation ARQ Retransmissions Handling Soft buffer combining Fast Uplink Feedback Generation encoding


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HSDPA DL Physical Channels HS-PDSCH: High-Speed Physical Downlink Shared Channel

Actual HSDPA data of HS-DSCH transport channel.

1-15 code channels.

QPSK or 16QAM modulation.

Divided into 2ms TTIs

Fixed SF16

Doesnt have power control

HS-SCCH: High-Speed Shared Control Channel

Informs UE how to receive HS-PDSCH in the same TTI.

Fixed SF128

Has power control

11--4 channels, more than 1 HS4 channels, more than 1 HS--SCCH needed if code multiplexing is used.SCCH needed if code multiplexing is used.

Associated DPCH, Dedicated Physical ChannelPower control commands for associated UL DCH

DPCH needed for each HSDPA UE.


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HSDPA UL Physical Channels HS-DPCCH: High-Speed Dedicated Physical Control Channel

MAC-hs Ack/Nack information.

Channel Quality Information (CQI reports)

SF 256

Associated DPCH, Dedicated Physical Channel

DPCH needed for each HSDPA UE.

Signalling

Uplink data 64, 128, 384kbps


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Physical Channel Structure

UE1

UE1

UE1

UE2

UE2

UE2

UE1

HS-PDSCH #2

UE1

UE1

UE1

UE2

UE2

UE2

UE1

HS-PDSCH #1UE3

UE3

UE3

UE1

UE1

UE1

UE1

HS-PDSCH #3

UE #1

UE #2

UE #3

1 radio frame (15 slots, total 10 ms)

2 ms

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Subframe #1 Subframe #2 Subframe #3 Subframe #4 Subframe #5

HS-SCCHUE1

UE2

UE2

UE2

UE1

UE3

UE3

UE3

UE1

UE1

User data onHS-DSCH

HS-DPCCHL1 feedback

3 slots

2 slots

HS-DPCCHL1 feedback

HS-DPCCHL1 feedback

3GPP enables time andcode multiplexing.

Picture presents timemultiplexing


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SF = 128

SF = 256

SF = 64

SF = 32

SF = 8

SF = 16

SF = 4

SF = 2

SF = 1

Codes for the cell common channels

Code for one

HS-SCCH

Codes for 5

HS-PDSCH's

Downlink Code Allocation

166 codes @ SF=256 available for the associated DCHs and non-HSDPA uses

HSDPA with 5 codes


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HSDPA Data Rates (examples)

Shown code rates are examples since real values are given by transport block size as

well as transmission and rate matching parameters.

16QAM with 15 multi-codes supports >10Mbit/s throughput. QPSK alone can support upto 5.3 Mbit/s (up to 7.2 Mbit/s by disabling coding).

Theoretically up to 14.4 Mbit/s can be sustained but 3GPP hardware specifications do

not support it (+ interference problems from e.g. synchronization channel).

QPSK

1/4

ModulationEffectiveCode rate

2/4

3/4

16

SF

16

16

16QAM

2/4

3/4

16

16

1.2 Mbit/s

Data rate(10 codes)

2.4 Mbit/s

3.6 Mbit/s

4.8 Mbit/s

7.2 Mbit/s

1.8 Mbit/s

Data rate(15 codes)

3.6 Mbit/s

5.3 Mbit/s

7.2 Mbit/s

10.7 Mbit/s

600 kbit/s

Data rate(5 codes)

1.2 Mbit/s

1.8 Mbit/s

2.4 Mbit/s

3.6 Mbit/s

4/416 4.8 Mbit/s 7.2 Mbit/s2.4 Mbit/s


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Rel99 vs HSDPA Retransmissions

Terminal

BTS

RNC

Rel99 DCH/DSCH Rel5 HS-DSCH

Packet Retransmission

RLC ACK/NACK

Retransmission

L1 ACK/NACK

Packet


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HSDPA L1 Retransmissions The L1 retransmission procedure (Hybrid ARQ, HARQ) achieves

following

L1 signaling to indicate need for retransmission -> fast round trip time facilitated between UE and BTS

Decoder does not get rid off the received symbols when decoding fails but combines the new

transmission with the old one in the buffer.

There are two ways of operating:

A) Identical retransmission (soft/chase combining): where exactly same bits are transmitted during eachtransmission for the packet

B) Non-identical retransmission (incremental redundancy): Channel encoder output is used so that 1sttransmission has systematic bits and less or not parity bits and in case retransmission needed thenparity bits (or more of them) form the second transmission.


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Retransmissions in HSDPA

Server RNC Node-B

UE

RLC retransmissions

TCP retransmissions

MAC-hs Layer-1

retransmissions


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Link adaptation: Modulation

QPSK2 bits / symbol =

480 kbit/s/HS-PDSCH =max. 7.2 Mbit/s

QAM4 bits / symbol =

960 kbit/s/HS-PDSCH =max. 14.4 Mbit/s

1011 1001

10001010

0001 0011

00100000

0100 0110

01110101

1110 1100

11011111

Q

I

10 00

0111

Q

I


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Fast Link Adaptation in HSDPA

0 20 40 60 80 100 120 140 160-2

0

24

6

8

10

121416

Time [number of TTIs]

QPSK1/4

QPSK2/4

QPSK3/416QAM2/4

16QAM3/4

Instantaneou

sEsNo

[dB] C/I received by UE

Link adaptationmode

C/I varies withfading

BTS adjusts link adaptation mode with a

few ms delay based on channel qualityreports from the UE


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Packet Scheduling Strategies

Throughput

high

low

Throughput coverage of

C/I based scheduling

Throughput coverage of

fair throughput scheduling

Operator adjustable slopes fordifferent service and user classes

Spectral Efficiency

Fair Throughput

Fair resources

C/I basedMin.targetThroughput

Tradeoff between cell

throughput, coverageand user fairness

Low coverage of high data rates


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Some Scheduler Types Proportional Fair Resource (P-FR)

UE with best throughput relative to its meanthroughput is chosen.

On short time-scale, different UEs get differentresources.

On medium time-scale, similar fairness to Round-Robin.

Maximum Throughput (M-TP)The UE with the highest instant-aneous throughput is

chosen.

Average throughput and cell capacity maximised.

Lots of UEs get zero throughput.

Not fair among queues on short or even mediumtime-scale.

Round-Robin (RR) = Fair Resource(FR)UE in front of queue is scheduled, then moved to back

of queue.

Each UE gets same amount of resources. Thethroughput depends on its link conditions.

Simple.

Fair Throughput (FT)

Each UE gets same throughput.

UE in bad conditions has to be given more resources.

Cell capacity is bad.


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Co-existence of R99 and HSDPA

Carrier shared between HSDPA and R99

Operator definable or dynamic resource sharingbetween HSDPA and R99

f1f1

f1f1

f2f2

f1f1

f2f2

Dedicated HSDPA carrier HSDPA UE directed to HSDPA carrier

= R5 HSDPA

= R99 DCH

HSDPA carrier, which can also be used for R99traffic in case of R99 high load

UE moved by RRC connection setup or byUE moved by RRC connection setup or by

handovershandovers

HSDPA can be introduced to the network withshared or with dedicated frequency


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HSDPA Planning


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HSDPA Dimensioning Overview

RNC

Node-B

Avg. SINR ->avg. cell throughput

Avg. user throughputcell throughput / users

Iub

Min. throughput atthe cell edge

WSPCs (1 or 3)

HSDPA power allocation

RR or PF schedulingSupported LA (modulation & codes)

UL traffic on DPCH

UL coverage: additionalmargin due to CQI and Ack/Nack

Throughput depends onthe signal to interferenceratio.

N t k Pl i f HSDPA


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Network Planning for HSDPA

Careful planning of cell dominance areas and SHO areas is essentialalso for HSDPA capacity in outdoor and indoor environments.

Following major issues should be considered in HSDPA networkplanning:

1. HSDPA deployment strategy: continuous coverage or hot spot coverage.

2. HSDPA power allocation

3. Average HSDPA cell throughput target

4. Associated UL DCH coverage (considering the effect of CQI reporting andMAC-hs Ack/Nack signaling)

5. Node-B processing capacity resources

6. Iub recources

7. RNC recources


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HSDPA Dimensioning Process Two different methods:

Method 1:

Given DCH traffic requirements, simply assigns to HSDPA the power that isnot used for DCH and obtains the HSDPA cell throughput as a result.

Method 2:

Assumes HSDPA cell throughput to be an input specified by the operator anduses it to derive the corresponding HSDPA transmission power.If thecalculated cell loading is larger than the planned loading, then there are

two ways:

1. Change the site configuration;

2. Add sites;


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HSDPA Dimensioning, Method 1Start

HSDPA transmissionpower calculation as

power not needed forDCH traffic

HSDPA throughputcalculation

WBTS dimensioning

PtxMaxHSDPA

1 or 3 WSPCs


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HSDPA Dimensioning, Method 2InputsTraffic model.Coverage requirementsor # sites.

Calculate # sites basedon the DCH traffic andcoverage requirements

Calculated the requiredHSDPA power for HSDPAcapacity and coverage.

Calculate WSP cards

Check that Rel99 trafficcan be handled withBTS_maxP CCH_P HSDPA_P

Not OK

OK

1.Add sites or carriers

2.Define strategy:Use one WSPCcard for one Node-B or OneWSPC card for one cell

1. 2. 3.

4.

5.tep 3Calculate needed HSDPA power based on the avg. and min. throughput requirements.

Step 4Check if the network can support required DCH traffic after part of the BTS power is allocated

for HSDPA.

Step 5Calculate required WSPC capacity (supports only WSPC cards and 1+1+1 configuration)


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Load Calculation Power Assignment for HSDPAFigure below shows the Node-B power allocation with and without HSDPA.Parameters can be set for the HSDPA priority vs DCH. (HSDPA Priority=1 or 2)

Common Chs(fixed part)

Common Chs(fixed part)

PC headroom HSDPA Power

DCH + variablepart of

Common Chs

PC headroom

DCH + variable

part ofCommon Chs

PtxTarget PtxOffsetHSDPA

PtxOffset

PtxTargetHSDPA

Variable Power

Variable Power

Fixed Power Fixed Power

Fixed Power


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Load Calculation Power Assignment for HSDPA Part of the Node-B power is allocated for HSDPA.The amount of this fixed power

depends on the HSDPA throughput requirements and power demands of DCHtraffic. DCH traffic part cant be limited to be too small. Typically 3-10W of themax. 20W Node-B tx-power can be allocated for HSDPA.

HSDPA decreases the amount of variable power, because the power for HSDPAis fixed. For this reason the power control headroom can be smaller, when thevariable power part is decreased.

For a dedicated HSDPA carrier the HSDPA power can be up to 75%, i.e. 15W ofmax. 20W Node-B tx-power.

Admission of The First HSDPA User


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Admission of The First HSDPA User

Overload Control Actions


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If there is at least one MAC-d flowallocated in the cell, overloadcontrol actions are started if thefollowing condition is true.

HSDPA Priority=1

Overload control actions are primarilytargeted to NRT DCH(s),(point B).The target power level is definedby the management parameterPtxTargetHSDPA.

If there is no more NRT DCH(s) in thecell, overload control actions aretargeted to MAC-d flows (Pointc).In this case all MAC-d flows inthe cell are released.



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If there is at least one MAC-d flowallocated in the cell, overloadcontrol actions are started if thefollowing condition is true.

HSDPA Priority=2

Overload control actions are targeted toMAC-d flows, all MAC-d flows inthe cell are released(Point B),


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HSDPA Roll Out Strategy1. One shared carrier with DCH traffic;

- HSDPA power must be limited to ensure enough capacity for DCH traffic.

- HSDPA power allocation can vary between 4-10 W( with 20W Node-B), depending onthe forecasted traffic mix and HSDPA throughput requirements.

2. Dedicated second carrier for HSDPA, where most of the Node-B power of thecarrier is allocated to HSDPA.

+ 10~15W power can be allocated for HSDPA

+ Directed RRC setup feature can be used to direct rel.5 UEs that are asking for NRT

bearer to the second carrier, but all other UEs would use only the first carrier => DirectNRT calls of all HSDPA capable UEs to second carrier.

- Required some more Node-B processing capacity, even with the same traffic amount,because the common control channels of the second carrier takes part of theprocessing capacity.

=>However, in early phase, when the traffic load has not yet increased, two WSPC

cards per Node-B should be enough to handle common channel, DCH and

HSDPA traffic in both deployment ways.


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Co-existence of R99 and HSDPA

Carrier shared between HSDPA and R99

Operator definable or dynamic resource sharingbetween HSDPA and R99

f1f1

f1f1

f2f2

f1f1

f2f2

Dedicated HSDPA carrier HSDPA UE directed to HSDPA carrier

= R5 HSDPA

= R99 DCH

HSDPA carrier, which can also be used for R99traffic in case of R99 high load

UE moved by RRC connection setup or byUE moved by RRC connection setup or by

handovershandovers

HSDPA can be introduced to the network withshared or with dedicated frequency


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Directed RRC setup for HSDPA layer All idle mobiles are forced to camp on f1 Access stratum release indicator and establishment cause reported

in RRC connection setup request

Any UE reporting Rel5 and interactive or background cause is

directed to HSDPA layer, others to Rel99 layer

f2, HSDPA

f1, Rel99

All idle UEscamp on f1

Any other RRCsetup onto f1

Rel5 IA/BG RRCsetup on f2


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HSDPA Handover There are several handover options for HSDPA:

Inter Node-B HS-DSCH to HS-DSCH handover:handover between two HS-DSCH at different Node-Bs

Intra Node-B HS-DSCH to HS-DSCH handover: handover between two HS-DSCH at different sectors inthe same Node-B.

HS-DSCH DCH channel switching.

There are own measurement control parameter sets for HSDPA.

HS-DSCH to HS-DSCH handovers and associated DCH soft handovers are possible

HS-DSCH

DCH in SHO

Active set -> 2 - Active set -> 1 ->Handover to HS-DSCH


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Inter Node-B HS-DSCH to HS-DSCH HO Handover decision is done by SRNC. Inter Node-B HO requires reset of the MAC-hs for the user in the source Node-B.

Hence, buffered PDUs in thesource Node-B are lost, i.e.,needs to be recovered by

higher layers (typically RLC layer)

SRNC

Source Node-B Target Node-B

HS-DSCH HS-DSCH

UE


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Intra Node-B HS-DSCH to HS-DSCH HO All data in the Node-B are moved from the source MAC-hs to the new target MAC-hs,

including information related physical layer HARQ (MAC-hs preservation).

Hence, during intra Node-B HS-DSCH to HS-DSCH handover, there is no need for recovery oflost PDUs in the source MAC-hs.

Channel Switching HS-DSCH DCH


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Possible triggers for HS-DSCH to DCH switching:The UE is moving to a cell without HSDPA

The load on HSDPA becomes too high (pre-emption actions)

Switching from HS-DSCH to DCH requires reset of the MAC-hs, so recovery of lost

PDUs in the MAC-hs is required.

Thus, from a logical point of view intra Node-B HS-DSCH to HS-DSCH handover issimpler than switching from HS-DSCH to DCH.

There is no handover from NRT DCH to HS-DSCH. UE an get back to HS-DSCH

only when it is getting a new capacity request.

HSDPA vs R99 DCH DL Coverage Adjacent


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Cells Loaded

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10

500

1000

1500

2000

2500

3000

3500

4000

Dis tance from BTS [relative to cell radius , 1=cell edge]

k

bps

Dedicated HSDPA carrier

HSDPA carrier shared with R99 DCH

R99 DCH

HSDPA improves datacoverage compared to R99

HSDPA improves data rates ingood coverage area compared

to R99

Single user assumed on HS-DSCH


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SINR

, where PHSDPA

is the HSDPA Tx power,PTxTotal

is the total Node-B Tx power,Pnoise

is theRx noise,Iother is the Rx other cell interference, Iown is the Rx own cell interference, is the DL orthogonality factor, and SF

16is the spreading factor of 16.

OrthogonalityOrthogonality FactorsFactors

Power of HSDPAPower of HSDPA

Larger interference from other cells=>Lower SINR

Avg. SINR and HSDPA Throughput


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The single-user HSDPAthroughput versus itsaverage HS-DSCH SINRis plotted.

Notice that these resultsinclude the effect of fastfading and dynamic HS-DSCH link adaptation.

An average HS-DSCHSINR of 23 dB isrequired to achieve themaximum data rate of3.6 Mbps with 5 HS-

PDSCH codes.

Avera

gesingle-userthroughpu

t[Mbps]

Average SINR (1 HS-PDSCH) [dB]

0.5

1.0

1.5

2.0

2.5

-10 -5 50 10 15 20 25 300

3.0

3.5

4.0

HS-DSCH POWER 7W (OF 15W), 5 CODES,1RX-1TX, 6MS/1DB LA DELAY/ERROR

Rake, Ped-A, 3km/h

Rake, Veh-A, 3km/h

Rake, Ped-B, 3km/h

MMSE, Ped-A, 3km/h

MMSE, Ped-B, 3km/h

Rake, Veh-A, 30km/h

Average HS-DSCH SINR [dB]

HSDPA- DL coverage


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Min. throughput at the celledge (single user)

SINR target at the cell edge

Min. required throughput defines HSDPA coverage Absolute minimum requirement for SINR is 0 dB (100kbps throughput)

HSDPA DL LINK BUDGET

DL DCH LINK BUDGET


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The estimation of HSDPA PathLoss (coverage)can be obtained from HSDPA link budget:

(below example to get similar DL DCH384 coverage)

Service HSDPA384

Transmitter - Node B

Max Tx Power (HSDPA) 12 W

Max Tx Power (HSDPA) 40.8 dBm

Tx Antenna Gain 18 dBi

Cable Loss 3 dB

EIRP 55.8 dBm

Receiver - Handset

Handset Noise Figure 8 dB

Thermal Noise -108 dBm

Background RSSI -100 dBmDownlink Load 80 %

Interference Margin 7.0 dB

Interference Floor -93.0 dBm

Min SINR 4.5 dB

Service PG 12.0 dB

Rx Antenna Gain 0 dBi

Body Loss 0 dB

Receiver Sensitivity -100.6 dB

DL Fast Fade Margin 0 dB

DL Soft Handover Gain 0 dB

Max. Path Loss 156.3 dB

NO SHO for HS-DSCH

txSCCHHStxPDSCHHSPAPtxMaxHSDPP __ =

ceFloorInterferenSFSINRISFSINRC +=+= 1616

SINR TO MATCH THE EDGE BITRATE

UL link budget: HS-DPCCH overhead Summary


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Maximum of power can be used for Pdpcch+Pdpdch;

In SHO, HS-DPCCH power related to DPCCH, which has no SHO, it need more power.

Maximum of power can be used for Pdpcch+Pdpdch;

In SHO, HS-DPCCH power related to DPCCH, which has no SHO, it need more power.

SINR Ec/Io (1/2)


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Based on the wideband average P-CPICH Ec/Io it is possible to estimate theachievable single HSDPA-user throughput.

It can be shown that the average HS-DSCH SINR can be expressed as afunction of the P-CPICH Ec/Io as

where PHSDPA, Ptot, and Ppilot is the HSDPA transmit power, the total Node-Btransmit power, and the P-CPICH transmit power, respectively. While isthe downlink orthogonality factor and

pilot

is the P-CPICH Ec/Io.

tot

pilot

pilot

HSDPA

PP

PSFSINR

= 16

SINR Ec/Io(2/2)


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With 5 HS-PDSCH codesand 7 W HSDPA power itis possible to achieve asingle-user HSDPA

throughput of 300 kbps at15 dB Ec/Io.

At 10 dB Ec/Io (close tothe BTS) the HSDPA

throughput is on the orderof 1 Mbps.

Reducing the HSDPApower from 7 W to 3 W

results in a single userthroughput degradation ofapproximately a factor twofor Ec/Io


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Setting a value for G factor means making assumptions on user location. Some G

factor distributions (CDF) coming from simulations as well as an operator field

experience are represented in the following chart:

-20 -10 0

G-factor [dB]

C

umulativedistribution

function[%]

10 20 30 400

10

20

30

40

50

60

70

80

90

100

Macrocell

(Wallu)

Veh-A/Ped-A

Macrocell(Vodafone)

Veh-A/Ped-A

Microcell

(Vodafone)

Ped-A

=

Pre-planning with NetAct Planner


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Pre-planning with NetAct Planner


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4 W HSDPA power 6 W HSDPA power

Pilot HSDPA HSDPA, 5codes HSDPA HSDPA, 5codesEc/Io SINR Throughput SINR Throughput

-15 0.56 167 2.32 249

-14.5 1.13 193 2.89 279

-14 1.70 220 3.46 316

-13.5 2.29 248 4.05 354

-13 2.89 279 4.65 393

-12.5 3.50 319 5.26 432

-12 4.14 359 5.90 479

-11.5 4.79 401 6.55 540

-11 5.47 445 7.23 604

-10.5 6.18 506 7.94 671

-10 6.92 576 8.68 745

-9.5 7.72 650 9.48 865-9 8.57 731 10.34 995

-8.5 9.51 871 11.27 1137

-8 10.57 1030 12.33 1278

-7.5 11.78 1208 13.54 1437

-7 13.26 1400 15.02 1688

-6.5 15.20 1725 16.96 2092

-6 18.23 2415 19.99 2871-5.5 28.23 3619 29.99 3619

Example for 5 codes with 16QAM:BTS total power 14W

Pilot power 2W

Radio Resource Configuration for HSDPA


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There should be two scenarios: HSDPA share the same carrier with R99, or

HSDPA uses a dedicated carrier. Compare the configuration with that of R99.

HSDPA requires WSPC type card in Node-B. One WSPC can be shared between1-3 cells, depending on the SW release and parameters. Regarding HSDPA thereis during the initial phase only one configuration supported, where one WSPC

provides the HSDPA for the whole Node-B (scheduler time multiplexing). Therequired 34 CEs are reserved only from a single WSPC.

In case there are HSDPA users on several sectors, transmission TTIs aredivided to different cells in the same Node-B in the ratio corresponding to thenumber of HSDPA users in each cell. So if there are HSDPA users in only one ofthe cells, then that cell will get scheduled every TTI. Worst case is equal number ofusers on each cell. Then each cell gets scheduling turn on every 3rd TTI. Onededicated scheduler per cell will be possible in RAN5.1. This will require aminimum of 3 WSPC cards installed in the 3-sector NodeB, each WSPC cardproviding 1 dedicated scheduler for 1 cell.

Radio Resource Configuration for HSDPA


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WSPC capacity Without HSDPA (Assume One 16kbps DCH using 1hardware channel)

64 DCHs of 16kbps OR 48 DCHs + common channels for three cells

HSDPA with 5 HS-PDSCH codes:16 HSDPA users (16 uplink HS-DPCCHs and 3.6 Mbit/s HSDPA downlink)

30 DCHs at 16 kbit/s OR 14 DCHs + common channels for three cells

Example Configurations

HSDPA act ive: no HSDPA

users, max AMR users

HSDPA active: max

HSDPA & UL 64 or 128

kbit/s users + AMR users

HSDPA active: max

HSDPA & UL 384 kbi t/s

users + AMR users

1 Omni: 1 WSPC 64-(34+16)=14 3 HSDPA + 2 AMR 14 AMR

1+1+1: 1 WSPC 64-(34+16)=14 3 HSDPA + 2 AMR 14 AMR1+1+1: 2 WSPC 64*2-(34+16)=78 16 HSDPA + 14 AMR 4 HSDPA + 14 AMR

1+1+1: 3 WSPC 64*3-(34+16)=142 16 HSDPA + 78 AMR 8 HSDPA + 14 AMR


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HSDPA System Performance

HSDPA Bit Rate as a Function of RSCP Isolated Cell


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-120 -115 -110 -105 -100 -95 -90 -85 -80 -75 -70

0

500

1000

1500

2000

2500

3000

3500

4000

CPICH RSCP [dBm]

kbps

HSDPA

DCH

Max UL AMR coverage for AMR unloaded (-116 dBm)

Max UL 64 kbps coverage for unloaded (-111 dBm)

HSDPA cell edge bit rate 300-1000 kbps in noise limited case

HSDPA bit rate depends on the definition of cell edge = uplink coverage

Max UL 64 kbps coverage loaded (-107 dBm)

CPICH 33 dBm HS-DSCH 41 dBm Dedicated HSDPA carrier Single user on HS-DSCH384 kbps DCH

HSDPA vs R99 DCH Coverage Adjacent CellsLoaded


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0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10

500

1000

1500

2000

2500

3000

3500

4000

Dis tance from BTS [relative to cell radius , 1=cell edge]

kbps

Dedicated HSDPA carrier

HSDPA carrier shared with R99 DCH

R99 DCH

HSDPA improves datacoverage compared to R99

HSDPA improves data rates ingood coverage area comparedto R99

Single user assumed on HS-DSCH

HSDPA Bit Rate Availability in System LevelSimulations80% d 15 d ll d HSDPA i


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0.01 0.1 1 100

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

80% power and 15 codes allocated to HSDPA service

Instantaneous (per 2 ms) user throughput [Mbps]

Cumulativedistributiof

unction[-]

Macrocell/Veh A/3kmph

Microcell/Ped A/3kmph

Mean bit rate 1.5Mbps in macro cells

Mean bit rate >5Mbps in micro cells

Dynamic System Simulations with Mixed HSDPADCH Traffic


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780 kbps

DCH:410 kbps

1090 kbps

HSDPA:670 kbps

DCH:410 kbps

1320 kbps

HSDPA:910 kbps

DCH:780 kbps

HSDPA:N.A.

RAN05 RAN06No HSDPA

43% Gain

21% Gain

MAC-hs scheduling:RAN05 = RR(Round Roubin)RAN06 = PF(Proportional Fair)

Veh-A / Macro

5 codes assumed for RAN05 and RAN06

Dynamic System Simulations Dedicated HSDPACarrier


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HSDPA:920 kbps

HSDPA:940 kbps

HSDPA:1200 kbps

RAN05QPSK only

RAN05 RAN06

4% Gain

27%Gain

Due to using PF instead ofRR

HSDPA:960 kbps

HSDPA:1100 kbps

HSDPA:1500 kbps

RAN05QPSK only

RAN05 RAN06

14%Gain

36%Gain

Due to using PF instead ofRR

Due to 16QAM

Due to 16QAM

Vehicular-A Pedestrian-A

Cell Throughput Results for Round Robin


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The total cellthroughput is 1150kbps.

Without any HSDPAtraffic, the Rel

99 DCH

cell capacity equals780 kbps.

Using 7-8 W for HSDPA,the total cell

throughput is increasedby a factor1150/780=1.47

7-8 W power for HSDPA provides goodcompromise between HSDPA bit rates and

R99 capacity

5-code HSDPA assumed

Cell Throughput Results for ProportionalFair


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The total cellthroughput of 1320kbps.

Without any HSDPAtraffic, the Rel

99 DCH

cell capacity equals780 kbps.

Using 7-8 W for HSDPA,the total cell

throughput isincreased by a factor1320/780=1.69

5-code HSDPA assumed

Bit Rate Distribution of HSDPA Users (Incase of Mixed R99 + HSDPA Traffic)


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1 HSDPA user on average

3 HSDPA userson average

5 HSDPA userson average

The median userthroughput 200-400kbps depending onthe load

The user throughputslimited by DCHtraffic and othercell inteference

Even during highload, 80% of HSDPAuses get >100 kbps.

WCDMA Round Trip Time Evolution


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Round trip time of 32-B packet

0

2040

60

80

100

120

140

160

180

200

RAN1.5ED2 RAN04 (20-ms TTI) RAN04 (10-ms TTI) RAN05 HSDPA

m

s

Internet

Iu + core

RNCIub

Node B

AI

UE

HSDPA pushes roundtrip time < 100ms


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Application Performance

Faster Content Download Times with HSDPA


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0

10

20

30

40

5060

70

80

90100

30 kB digital

image

100 kB video

clip

300 kB Symbian

application

4 MB MP3

Seconds

GPRS 3+2EDGE 3+2WCDMA 384 kbpsHSDPA (700 kbps)WLAN .11b

Fast download of ve

large content

Faster Web Browsing with HSDPA


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Web page download time

05

10152025303540

GPRS 3 2 EDGE 4 2 WCDMA 384kbps

HSDPA

eonds

100 kB200 kB

Assumptions: PDP context exists, GPRS 10 kbps/TSL, EDGE 40 kbps/TSL, WCDMA 128 kbps/384kbps, HSDPA 700 kbps


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Thank You

hsdpa v1 cu english jsmcc

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