amr progressive power control

8/10/2019 AMR Progressive Power Control

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1 © Nokia Siemens Networks

AMR Pilot presentation

AMR Progressive power control

Eric Kroon




Scope of presentation

• The scope of the presentation will be as follows

– Overview of feature

– New PPC Parameters

– KPI’s

– PPC optimization




Feature overview




AMR Progressive Power Control- HW/SW Requirements

SUPPORTED IN:

GSM1900

Y

MSC

-

NokiaNetAct

OSS4.2 2)

SGSN

-

NetActPlanner

-

BSC

S13

GSM800

Y

GSM900

Y

GSM1800

Y

Nokia 2nd

Gen.

N

Nokia

Talk-family

(Y)

Nokia

PrimeSite

N

Nokia

MetroSite

(Y)

Nokia

InSite

N

Nokia

UltraSite

(Y)

SGSN

HW/FW-

TC

HW/FW

BTS

HW/FW-

BSC

HW/FW-

BTS

MMI-

MSY 1)

BSC

MMIY

Operating/

Application Application

HW/FW DEPENDENCY:

Note(s): 1) AMR capable MS 2) OSS4.2 CD set1 / OSS5 CD set 1

Nokia

FlexiEdge

(Y)




AMR Power Control – current situation

QualityRxqual BER %

0 <0.2

1 0.2 - 0.4

2 0.4 - 0.8

3 0.8 - 1.6

4 1.6 - 3.2

5 3.2 - 6.4

6 6.4 - 12.8

7 >12.8

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Power level

30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Attenuation dB

pc upper threshold dl Rx qual AMR FR (UDRF)

pc lower threshold dl Rx qual AMR FR (LDRF)

Optimum quality, No need to change transmitting power

Power

• In normal Power Control algorithm has a fixed RX Quality window across the

BTS and MS transmit power range to power up/down. • Example:




UURF

LURF

No action

Quality

(BER)

RxLevel

-110dBm -47dBm

3

0

U U R

( P O C ) - 7 0

L U R

( P O C ) - 9 5

(PxNx: 2/3)

(PxNx:6/16)

( P x N x : 1 / 1 )

( P x N x : 1 / 1 )

( P x N x : 1 /

1 )

L U

R

( H O C ) - 9 5

FR AMR & Power Control & HO control co-ordination in UL

IHRF (PxNx:4/6)

(AMR) Qual HO

HYS -6dB

(PxNx: 4/6)

4IHRH

5QURF

Power down quality Packing of the call

Unpacking the call

P o

w e r d o w

n

l e v

e l

P o

w e r u p

l e v

e l

Power up quality

H

a n d o v e r

t r

i g g e r

1

Handover trigger


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AMR Progressive Power Control -Introduction

• AMR Progressive Power Control has a dynamic RX Quality window

across the BTS and MS transmit power range to power up/down• AMR PPC is an enhancement to the existing Power Control (PC)

algorithm running in the BSC and controlling the transmitting power ofthe MS and BTS

– Existing level PC threshold are used together with PPC

• AMR PPC is application software in S13 and it contains two separatefunctionalities which can be separately controlled

▪ AMR PPC for MS power controlling

▪ AMR PPC for BTS power controlling

• AMR PPC algorithm will be used only for AMR calls. When the AMRPPC algorithm is disabled, the normal PC algorithm is used also for

AMR calls• Same PX/NX parameters and averaging windows for the RXQual

parameters are used in the normal PC & the PPC algorithm

• The real benefits of the feature depends on current implementation ofthe network



AMR Progressive Power Control -Description• In AMR PPC algorithm, the algorithm internally changes the thresholds for quality based

PC according to AMR PPC parameters and actual transmitting power

• It is possible to define 4 power level points, where power control quality thresholds are

changed

• The changes of power control quality thresholds in AMR PPC algorithm are fixed to be -2, -1, 0, +1, +2 depending on the current power level

• Example:



Mechanism - example

• How does it then look like via an example (UL)

– Lets assume that the LURF = 5 and UURF = 3

– MS power level is at 15 (lowest power level ≈ high RXLevel)

▪ the algorithm will trigger an increase in MS power if the RXQual (UL)degrades beyond RXQual = 3 (LURF = LURF - 2)

▪ the power is going to be decreased when RXQual = 1 (UURF = UURF -2)

– MS Power level is at 2 (almost at full power)

▪ the power is going to be increased if the RXQual drops bellow RXQual = 6(LURF = LURF +1)

• If QURF = 6 then first an handover is being made

▪ The power is going to be decreased if the RXQual is better then 5 (UURF

= UURF +1



Benefits of PPC vs. PC

• The aim of this feature is get

– some capacity gain

– decrease the Dropped Call Rate (DCR)

• AMR Link adaptation mechanism remains the same after implementation ofPPC

• The AMR PPC aims to optimize the power of the BTS/MS as much aspossible which should in general reduction the UL/DL interference

– PPC reduces the highest transmitted power levels

• AMR PPC reacts before AMR Link Adaptation

– First power up/down before codec change (depending on window sizeand NxPx setting of course)



Main gain area’s of feature

• The aim of this feature is get

– Some capacity gain (only if HR is implemented)

– Decrease the Dropped Call Rate (DCR)

• Most beneficial environments are

– High loaded BSC – Lot of interference to decrease the overall interference (small impact)

– BSC with low RXQual e.g. BSC’s with remote area’s

▪ If the PC has not been optimized to super fast reaction (NxPx)



New PPC Parameters




AMR Progressive Power Control – NewParameters

• All 32 new AMR PPC parameters are for defining power level points

where the PC quality thresholds will changes• They are grouped as follows

– Lower (L) or upper power control thresholds (U)

– UL (U) or DL (D)

– HR (H) or FR (F)

– Threshold 1 to 4

▪ E.g. AMR PPC DL FR Upper threshold 1 (UDF1)

▪ E.g. AMR PPC UL HR Lower threshold 2 (LUH1)

• Quality thresholds are changed depending on AMR PPC parameter andmeasured transmitting power, so that they are either reduced by 2 or 1 ORincreased by 1 or 2




Parameter settings

• If P > T1 then UDRF/LDRF -2

• If P > T2 and ≤ T1 then UDRF/LDRF -1

• If P ≥ T3 and ≤ T2 then UDRF/LDRF (normal AMR PC)

• If P ≥ T4 and < T3 then UDRF/LDRF +1If P < T4 then UDRF/LDRF +2

where P = Transmit Power level in dB

Default settings

T1 = 26

T2 = 22

T3 = 6T4 = 2




Parameter recommendations for pilot

AMR PPC DL/UL FR LOWER THRESHOLD 1....................... (LDF1/LUF1)... 26 dB AMR PPC DL/UL FR LOWER THRESHOLD 2....................... (LDF2/LUF2)... 22 dB

AMR PPC DL/UL FR LOWER THRESHOLD 3....................... (LDF3/LUF3)... 6 dB

AMR PPC DL/UL FR LOWER THRESHOLD 4....................... (LDF4/LUF4)... 2 dB

AMR PPC DL/UL FR UPPER THRESHOLD 1....................... (UDF1/UUF1)... 26 dB

AMR PPC DL/UL FR UPPER THRESHOLD 2....................... (UDF2/UUF2)... 22 dB

AMR PPC DL/UL FR UPPER THRESHOLD 3....................... (UDF3/UUF3)... 6 dB AMR PPC DL/UL FR UPPER THRESHOLD 4....................... (UDF4/UUF4)... 2 dB

AMR PPC DL/UL HR LOWER THRESHOLD 1....................... (LDH1/LUH1)... 26 dB




AMR PPC DL/UL HR UPPER THRESHOLD 1....................... (UDH1/UUH1)... 26 dB




• Our parameter recommendations for the pilot are the default values




KPIs




AMR Progressive Power Control – Statistics

• New AMR PPC measurement will be introduced for measuring average RXquality class per transmitting power class distribution

– Measurement consists of Rx quality sum counters separately for uplink anddownlink

– For each RX quality sum counter there is a sample number counter(denominator) indicating the numbers of samples in each RX quality classsum counter

– There are 4 counters for each transmitting power class (0-15)• Counters can be utilized in post processing for calculating the actual average

values by dividing the sum counter with amount of samples

• Counters are updated only in case of AMR FR and AMR HR calls

• The object level of AMR PPC measurement is TRX ID




Expected results from implementing PPC

• Main changes in the network

– Increase of signal quality (reduced interference)

• This results in the following KPI changes (subset of the interference reduction)

– Reduced DCR – higher signal level and lower interference

– Congestion might become less

– Increased capacity – better signal level and lower interference

– Increase in AMR HR calls

▪ Increased power levels lowers the overall interference thereby reducing the amountof AMR HR to FR Unpacking attempts due to call quality.

▪ Greater percentage share of AMR HR calls vs. AMR FR calls

– Shift in Codec Distribution to higher codecs - lower interference

– Decrease in HO attempts & HO failures - power up / down is preferred overcodec change

– MS power reduced

– BTS power reduced

– Improved SACCH and FACCH performance




PPC optimization




AMR PPC optimization

• With the feature there are a few new counters introduced based on

– Power class

– UL or DL

• By checking the following counters / KPIs an indication can made if thesettings are the most optimum for the BTS

– Distribution of the counters across the MS power level

▪ Remember that this MS power parameters are BSC parameters

– Codec distribution

– Samples per codec and RXQual




Any questions regarding AMR PPC ?

amr progressive power control

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