132592287-08-RNC-Dimensioning

7/16/2019 132592287-08-RNC-Dimensioning

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1 © Nokia Siemens Networks

For internal use

3GTPL - RNC Dimensioning




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211 2

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RNC Dimensioning – RNC Variants

RNC196 RNC450 RNC2600

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211 2

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4

5

6 7

RNC Dimensioning – RNC 196


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For internal use

RAN1766SW Gigabit level RNC196 step 8 upgrade



RAN1766 Gigabit level RNC196/step 8 upgradeIntroduction

Brief description:

• Feature introduces new RNC196 step for RU20.• Feature describes basic requirements and extra units needed for the

upgrade.

Motivation and benefits:

• Possibility of using RNC196 in RU20 release.

• The operator can get more value for the RNC196 investment



RAN1766 Gigabit level RNC196/step 8 upgradeFunctional description

• The new configuration utilises the CDSP-DH and interface unit upgrades thatare implemented in RNC196 step 7. Additionally, some new CDSP-DH unitsare needed.

• CDSP-DH upgrade is in RNC196 step 7,providing HSPA peak rate increasecapability. It is introduced in RU10 release (RAN1226). Eight (8) CDSP-DHunits are needed in this upgrade.

• Interface unit upgrade for IP is introduced in RU10. It requires SF10E for SFU

and the NP2GE-B interface unit(s) for physical Gigabit Ethernet interfaces.

• In RU20 release, new optional STM-1 ATM interface upgrade is supported.NP8S1-B can be taken into use in RNC196 step 8.

• RNC196 step 8 requires that either the IP interface upgrade or the new STM-1interface upgrade is done to all RAN interfaces and also the CDSP-DHupgrade for HSPA peak rate increase is carried out. Also, approximately 8

CDSP-DH units are needed in addition to the HSPA peak rate upgrade (8CDSP-DH units).



CDSP-DH

SF10E

NP2GE

HSPA

Peak rate IP

RNC196CS 1-5

HSPA

Peak rate IP

SF10E

NP2GECDSP-DH

RNC196

CS 6-7 CS7

RNC196 CS 8

CS8

reconfiguration

CS 5 to CS6-7

CS 5 to CS6-7

OptionalStandaloneOMS

NP8S1P

8 CDSP-DH added

SF10E

NP2GEP

8 x ICSU added Removed:GTPU

A2SUNIS1/NIP1

8 x CDSP-C=> CDSP-DH for HSPA peak rate

NPS1 +NPGEMax. count = 4 pairs

NPS1Max. count =3 pairs

NP2GE

IP

RAN1766 Gigabit level RNC196/step8 upgradeRNC196 Upgrade paths




RU20 Capacity Figures for RNC196/1to8





HSPA Capacity Figures

HSDPA does not include SHO overhead. HSUPA includes 40% SHO in Iub

*) on top of GTP-U layer




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211 2

3

4

5

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RNC Dimensioning – RNC 450


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HSPA Capacity Figures (below)



1) on top of GTP-U layer




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211 2

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4

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6 7

RNC Dimensioning – RNC2600


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*) recommended up to 1600 BTSs

Capacity & reference call mix model




HSPA Capacity Figures (below)



*) on top of GTP-U layer




For internal use

RAN1793 SW Enhanced RNC2600




RAN1793 SW Enhanced RNC2600Introduction

Brief description:

•This feature describes how RNC2600 capacity can be increased by SW

enhancements.

Motivation and benefits:

•Higher RNC capacity allows to handle more subscribers, more traffic

•Higher RNC capacity allows to decrease number of RNC’s in network




RAN1793 SW Enhanced RNC2600RNC capacity

With SW optimisations the RNC2600 capacityis increased in RU20 as follows:

• PS data throughput in Iub (DL+UL):

• AMR capacity:

• Busy Hour Call

• Attempts:

•The HW configuration will remain as it is in RU10

release.

3500 MbpsRU202800 Mbps

50 000 ErlRU2020 000 Erl

RU201 440 000b 2 000 000RU20




RAN1793 SW Enhanced RNC2600RNC2600 Capacity

RNC model/capacity RNC2600 Step1 RNC2600 Step2 RNC2600 Step3

Iub DL throughput [Mbps] 1100 1800 2500

AMR capacity [Erlangs with 12.2 kbit/s codec] 17000 34000 50000

CS voice over HSPA capacity [Erl] 15000 30000 40000

BTS/Carrier connectivity 1440 2100 2800

HSDPA/HSUPA peak rate per user [Mbps] 21.1/5.8 21.1/5.8 21.1/5.8

RRC connected state UEs 88000 152000 200000

HSPA active users per RNC 20000 35000 50000

Iu-ps HSDPA net bit rate [Mbit/s] 1010 1630 2250

Iu-ps HSUPA net bit rate [Mbit/s] 300 490 675

HSDPA BTS/Carriers 1440 2100 2800

C2600 S C f C




RNC2600 with SW Configurable CapacityLicensing

High capacity RNC2600enables capacity licensingin three dimensions

Capacity can be freely SWconfigured for

• Data (Iub PS Data)

• Voice (AMR Erlang)• Number of Carriers

Capacity upgrades are

possible only with anupgrade of a SW licence

No HW changes is required

capacity step 1

0….900 Mbps DL

0….8000 Erl

0….1440 Cells

capacity step 2

0….1500 Mbps DL

0….14000 Erl

0….2100 Cells

capacity step 3

0….2000 Mbps DL

0….20000 Erl

0….2800 Cells

RNC2600 AMR C it Li i




RNC2600 AMR Capacity Licensing

• RNC counts the number of simultaneous AMR RABs periodically.

• When the amount is greater than the licensed capacity, RNC does notadmit new AMR RABs as long as the amount decreases below licensedlimit.

• Some overcapacity is allowed and hysteresis is used between starting andstopping the AMR limiting.

LicencedAMR capacity

HW max capacity

PRFILE:AMR

LicenceWarning

Threshold (eg. 90%)

time

#AMR RABs

PRFILE:AMR Licence

Durat ion to Set

Warning (eg. 600s)

Set alarm:

“licence_capacity_warning_a”

Cancel alarm:


PRFILE:AMR Licence

Dura ti on t o Cancel

Warning (eg. 7 d)

RNC2600 PS Th h t Li i




RNC2600 PS Throughput Licensing

• PS Throughput licence gives the maximum RNC downlink PS throughput

in Mbit/s.

• When the throughput is higher than the licensed capacity, RNC starts tolimit downlink PS throughput on each Iu-PS interface.

• Some overcapacity is allowed and hysteresis is used between starting,decreasing and stopping the throughput limiting.

Licenced PS capacity

HW max capacity

PRFILE:PS Licence

Warni ng Threshold (eg. 90%)

time

PS Throughput

PRFILE:PS Licence

Dura ti on t o Set

Warning (eg. 600s)

Set alarm:


Cancel alarm:


PRFILE:PS Licence

Dura ti on t o Cancel

Warning (eg. 7 d)




For internal use

RAN1795 RNC2600 Coverage Optimized Solution

RAN1795 RNC2600 coverage optimized solution




RAN1795 RNC2600 coverage optimized solutionFunctional description

• Coverage solution is supported by each RNC2600 HW configuration.RNC HW configuration is always the same between the capacity andcoverage solution.

• Selection of the configuration mode is done by a RNC capacity SWlicense keys and no HW changes are required. When the cell connectivityis more than 2800 the maximum PS data throughput and AMR capacity isdecreased by 10 %, compared to the RU20 level of cell connectivity.

• Step1 – 1 Cabinet

• Step2 – 1.5 Cabinet

• Step3 – 2 Cabinets

RNC 2600 Cells

AMR

Capacity [Erl]

PS Iub data

throughput (DL +

UL) [Mbit/s]

Step 1 2450 16200 1420

Step 2 3600 31500 2270

Step 3 4800 45000 2800

RAN1795 RNC2600 coverage optimized solution




RAN1795 RNC2600 coverage optimized solution Activation and operation

• RNC2600 capacity is controlled with licenses defined in feature RAN1198

"RNC2600 SW License Key Controlled Capacity".

• No new license keys are introduced due to this feature RAN1795RNC2600 coverage optimized solution.

Network dimensioning impact




Network dimensioning impact

• RAN1766 Gigabit level RNC196/step8

– Additional RNC196 step to take into account during RNC dimensioning

• RAN1793 SW Enhanced RNC2600

– Increased RNC2600 capacity limits for all steps need to be taken intoaccount during RNC Dimensioning

• RAN1795 RNC2600 coverage optimized solution

– Possibility of choose higher RNC2600 connectivity limits in cost of

capacity limits in the RNC calculation.

RNC dimensioning based on throughput




Add SHO and

protocoloverhead

Add SHO and

protocol overhead


Input: Traffic per site in traffic

types

Calculate AMR

Load

Calculate CS

Data load

Calculate NRT

Data Load

Number of RNCs needed

Apply traffic mix rule

Calculate HSDPA

Load

Apply FP

Rate





RNC dimensioning based on throughputFrame protocol bit rate

• The load for the CS-Data and NRT traffic needs to be considered at the Frame

protocol level

• The RNC throughput limits have been calculated for this reference level

Service (TTI) FP bit rate

AMR12.2 16 400

CS 64 (20 ms) 66 100

PS AM 64 (20ms) 69 500

PS AM 128 (20ms) 136 700

PS AM 256 (10ms) 273 300

PS AM 384 (10ms) 408 000

RNC Dimensioning




RNC DimensioningHSDPA Load

• The HSDPA load is calculated separatefrom R99 NRT Traffic

• Note that

– HSDPA connections can not be in SHO

– The protocol overheads are variabledepending on the HSDPA rate.

• The overhead variation is presented inthe attached table

• RNC is such a big aggregation point for the traffic that we can use the averageuser traffic figures to determine theHSDPA traffic load for the RNC

Calculate HSDPA

Load

Apply FP

Rate

( ) er fic_Per_UsHSDPA_Traf dFP_Overhea1ficHSDPA_Traf Sites teUsersPerSi∑ ∑×+=

Rateabove RLC[kbps]

FP bit rate[kbps]

FPoverheadover RLC

64 74 16%

128 142 11%256 276 8%

384 410 7%

512 545 6%

1024 1084 6%

1600 1694 6%2048 2165 6%

3360 3557 6%

RNC Dimensioning




RNC DimensioningHSDPA Load Example

• We have 2000 sites, 1000 users per site.

• Each user downloads a 200 kByte fileduring the busy hour

• We estimate the average throughput for a

user to be 512 kbps over RLC – FP OH = 6%

Mbps

kbps

941

444.0100020001.06

1.06ficHSDPA_Traf 1..2000i 1..1000 j 3600

8200

≈

×××=

×= ∑ ∑= =

×

Calculate HSPA

Load

Apply FP

Rate

Rateabove RLC[kbps]

FP bit rate[kbps]

FPoverheadover RLC

64 74 16%

128 142 11%

256 276 8%

384 410 7%

512 545 6%1024 1084 6%

1600 1694 6%

2048 2165 6%

3360 3557 6%




For internal use

RNC Dimensioning Exercise

Dimensioning Input




Dimensioning Input

• The RNC under investigation is an RNC2600 Step1

• The input assumes activity factor of the NRT services = 15%

• Number of Sites = 254

• Number of Subscribers per Site = 403

• Soft Handover = 30%

• CS Data blocking = .1%

Input table




pTraffic Model per user

Service mEr/Sub RAB [Kbps] Activity

ServicePenetrati

on

BHTrafficVolume[Kbits]

Voice UL 28.44 12.2 0.5 100% 572.12

DL 28.44 12.2 0.5 100% 572.12

Video UL 0.11 64 1 100% 24.95

DL 0.11 64 1 100% 24.95

Service Kbps/Sub RAB [Kbps] Activity

ServicePenetrati

on

BHTrafficVolume[Kbits]

Internet 128 UL 0.0026289 128 - 100% 9.46

Internet 128 DL 0.0012680 128 - 100% 4.56

Internet 16 UL 0.0001543 16 - 100% 0.56

Internet 16 DL 0.0010379 16 - 100% 3.74

Internet 256 UL 0.0000000 256 - 100% 0.00

Internet 256 DL 0.0005125 256 - 100% 1.84

Internet 32 UL 0.0000013 32 - 100% 0.00

Internet 32 DL 0.0000492 32 - 100% 0.18

Internet 384 UL 0.0000000 384 - 100% 0.00

Internet 384 DL 0.0058320 384 - 100% 21.00

Internet 64 UL 0.0005675 64 - 100% 2.04

Internet 64 DL 0.0002407 64 - 100% 0.87

Internet 8 UL 0.0000008 8 - 100% 0.00

Internet 8 DL 0.0000089 8 - 100% 0.03

HSDPA UL 0.0228467 64 - 100% 82.25

DL 0.1163493 HS I/B - 100% 418.86





Add SHO and

protocoloverhead

Add SHO and

protocol overhead


Input: Traffic per site in traffic

types

Calculate AMR

Load

Calculate CS

Data load

Calculate NRT

Data Load

Number of RNCs needed

Apply traffic mix rule

Calculate HSDPA

Load

Apply FP

Rate

This exercise analyses only

the throughput limitation of

the RNC

AMR Load




The AMR Load is calculated as follows:

Sum all AMR traffic from all users in all sites under the RNC

_____ mErl/Sub * _____ NodeBs * _____ Subscribers per NodeB

= ______ Erl (Enter in AMR Erl)

The RNC2600 Step1 limit is _____Erl (Enter in RNC2600 Step 1 limit)The RNC is ____/____ = ___% loaded of the max load (Calculated)

Calculate AMR

Load

CS Data Load




The CS DATA Load is calculated as follows:

Sum all CS Data traffic from all users in all sites under the RNC

_____ mErl/Sub * _____ NodeB * _____ Sub/NodeB

___________________________________________

1000

= ______ Erl (Enter in CS Data load)

Add SHO @30% = _____Erl (Enter in Load with SHO)

NP add-in - Calculate Erlb Chans with .1% blocking (.001)

=____Chans x FP layer br____(Enter in Bearer Rate FP)

=________Mbps FP Load level

Add SHO and

protocol overhead

Calculate CS

Data load

(Applying ErlangB before SHO would give 10% more CS Data load)

PS Data Load – 128, 256,384 Kbps D/L

Calculate PS




, , pThe PS Data Load is calculated as follows:

PS NRT (Bearer Rate) D/L Data traffic from all users in all sites under the RNC

_____ Kbps/Sub (per D/L BR) * _____ NodeB * _____ Sub/NodeB

= ______ Kbps (Enter in Measured Load for BR)

Add SHO @30% = _____Kbps (Enter in Load with SHO)

RNC Measured Load = Sites_NRT_bearer_i Kbps

___________________ (Enter Bearer rate and AF)Bearer_i_rate_x_AF

= ________Erl




Add SHO andprotocol overhead

Data load

PS Data Load – 64 Kbps D/L

C l l t PS




p

PS NRT (Bearer Rates 8,16,32 & 64 Kbps aggregated)

D/L Data traffic from all users in all sites under the RNC

8 Kbps/Sub per D/L +16 Kbps/Sub per D/L+ 32Kbps/Sub per D/L+64Kbps/Sub per D/L BR * _____ NodeB * _____ Sub/NodeB


Add SHO @30% = _____Kbps (Enter in Load with SHO)

RNC Measured Load = Sites_NRT_bearer_i Kbps ___________________ (Enter Bearer rate and AF)

Bearer_i_rate_x_AF

= ________Erl




Add SHO and

protocol overhead

Calculate PS

Data load

HSDPA Data Load




HSDPA Traffic _______ * _____ NodeB * _____ Sub/NodeB


RNC Measured Load x FP overhead over RLC (6%) =

________Mbps Rate aboveRLC [kbps]

FP bit rate[kbps]

FP overheadover RLC

64 74 16%

128 142 11%

256 276 8%

384 410 7%

512 545 6%

1024 1084 6%

1600 1694 6%

2048 2165 6%

3360 3557 6%

Calculate HSPA

Load

Apply FP

Rate

All NRT Load




Add SHO and

protocol

overhead

Calculate NRT

Data Load

NRT64 NRT128 NRT256 NRT384 HSDPA

Measured Load

- Erl for CS

- Mbps for PS

136.8 129.8 52.5 597.0 11909.7

Load with SHO 177.9 168.7 68.2 776.1 11909.7

Bearer Nominal Rate 64 128 256 384 N/A

Activity Factor 15% 15% 15% 15% N/A

Blocking probability 0.1% 0.1% 0.1% 0.1% N/A

Simultaneous users33 20 8 26

N/ABearer Rate FP 69.5 136.7 273.3 408 N/A

FP Level Load (Mbps) 2.29 2.73 2.19 10.61 12.62

RNC Dimensioning




Calculating RNC ThroughputCheck

Throughput Limitations

5% is only for RNC2600, for

older RNC types 25% isvalid

Total throughput check

CS Data throughput check

PS Data traffic mix check

RNC Dimensioning




Erlangs CS Data PS Data NRT64 NRT128 NRT256 NRT384 HSDPA

Measured Load

- Erl for CS

- Mbps for PS 2910.8 11.1 136.8 129.8 52.5 597.0 11909.7Load with SHO N/A 14.4 177.9 168.7 68.2 776.1 11909.7

Bearer Nominal Rate N/A N/A 64 128 256 384 N/A

Activity Factor N/A N/A 15% 15% 15% 15% N/A

Blocking probability N/A 0.1% 0.1% 0.1% 0.1% 0.1% N/A

Simultaneous users N/A 27 33 20 8 26 N/A

Bearer Rate FP N/A 66.1 69.5 136.7 273.3 408 N/A

FP Level Load (Mbps) N/A 1.8 30.4 2.29 2.73 2.19 10.61 12.62

RNC450 Step2 limit (RAS 6250 300 300 216 258 302 303 270

Load/Limit % 46.6% 0.6% 10.1% 1.1% 1.1% 0.7% 3.5% 4.7%

Total Throughput Check 57.3%

CS Data < 25% Max Iub OK

DMCU Max Check 11.0%

The check sums the load/limit ratios for

all bearers and checks that this is less than 100%

Checking PS Traffic MixCheck

Throughput LimitationsPS Data traffic mix check

The DMCUmax limits are taken here from RAS06 RNC Product Description

RNC Dimensioning – RU10




Checking PS Traffic Mix

• The limits for the NRT max and HSDPA load per bearer type are shown in thetables. These are in reference to the PS traffic load formula shown on the previousslide.

• The additional check is needed because different bearers load the DMCUs indifferent manner.

• Note the differences between the releases

• In RU10 in case of DMCU upgrade needed to enable HSDPA 14.4 peak rate. Withthe upgrade the maximum DMCU throughputs are increased so that the definedmaximum Iub throughput can be achieved with any single traffic type, i.e. also with

R99 64 kbit/s RABs.

– After the upgrade the PS Traffic mix check is not needed any more.

RNC450 (RN2.2

RAS05.1)

150 300 450

Max PS64 [Mbps] 91 189 323

Max PS128 [Mbps] 151 307 499

Max PS256 [Mbps] 192 385 656

Max PS384 [Mbps] 184 383 570

HSDPA 135 270 405

RNC450 (RN3.0 – RAS06) 150 300 450

Max PS64 [Mbps] 120 216 344

Max PS128 [Mbps] 144 258 436

Max PS256 [Mbps] 153 302 452

Max PS384 [Mbps] 154 303 451

HSDPA 135 270 405

132592287-08-RNC-Dimensioning

Documents

cdspdh upgrade

new cdspdh units

hspa peak rate upgrade

ip interface upgrade

atm interface upgrade

new rnc196 step

upgrade functional description

rnc2600 capacity