puschpowercontrolalphafactor combination tests

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LTE/IRC/APP/032749 V06.03 / EN Approved Standard 28/Oct/2013 Page 125/290 Our initial assumption was to demonstrate other parameter presents in the power control algorithm performance impact, besides pUSCHPowerControlAlphaFactor parameter. So far we have

considered set of values for related test cases, they can be seen in the Table 11-2

Parameter SET1 SET2 SET4 SET3 SET5 SET6 SET7

uplinkSIRtargetValueForDynamicPUSCHscheduli

ng 15 15 15 15 15 15 15

pUSCHPowerControlAlphaFactor 1 1 1 1 1 1 1

pUSCHPowerControlAlphaFactor 0,8 0,8 0,8 0,8 0,8 0,8 0,8

pUSCHPowerControlAlphaFactor 0,7 0,7 0,7 0,7 0,7 0,7 0,7

pUSCHPowerControlAlphaFactor 0,6 0,6 0,6 0,6 0,6 0,6 0,6

pUSCHPowerControlAlphaFactor 0,5 0,5 0,5 0,5 0,5 0,5 0,5

pathLossNominal 60 60 60 85 70 20 40

minSIRtargetForFractionalPowerCtrl 0 0 0 0 0 0 0

maxSIRtargetForFractionalPowerCtrl 15 20 19 20 19 19 19

Table 11-2: Different Set’s Combinations

FFS: The test cases for pUSCHPowerControlAlphaFactor combination tuning (in Lab) have not been completed yet, the results will be provided after the test cases are finished.

We have considered a low IoT value=3dB in an UL&DL balanced cabled tests lab environment. We increased the attenuation over the same amount of time for all the tests we have performed, 20MHz and 2.6GHz network.

In the theory, FPC function is same for TDD and FDD, based on Network Engineering for Optimization team’s tests, the obtained below results were from FDD:

Set 1 Configuration analysis

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LTE/IRC/APP/032749 V06.03 / EN Approved Standard 28/Oct/2013 Page 126/290 Figure 11.1-6: Set 1 Result

Based on the above results in Figure 11.1-6 we can conclude that having a non fractional power control mechanism will lead to best throughput (compared to FPC – ON cases) in near & mid cell.

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LTE/IRC/APP/032749 V06.03 / EN Approved Standard 28/Oct/2013 Page 127/290 Starting path loss 110dB we have observed an UL throughput degradation which corresponds to number of PRB decrease, which explains the product reaction to UL TxPower saturation (number of PRB are decreased when the TxPower is maximum and the number of PRB-es is still high).

Figure 11.1-7: Set 1UL Throughput & UE TX Power vs. Path loss

NOTE: PL de-synch(~4dB) is due to the fact that in Figure 11.1-7 displays UL PL and Figure 11.1-10 displays DL PL.

Please use the UL throughput curves to align the TxPower it effect.

Comparing the plots above we can conclude that for pUSCHPowerControlAlphaFactor=0.7 number of PRB is not degraded, UE TxPower at near&edge cell environment has an acceptable value and also the uplink throughput still is satisfactory for most of the services an operator might offer.

Below in Figure 11.1-8 is the theoretical analysis for SIR target calculation in case of SET2&4.

Results confirm the theory and the fact that having Max_SIR_targetForFPC greater than

SIR_Target_Nominal will not help (if Path loss nominal is equal 60dB). There are no commercial networks in which the less than 60dB is found.

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LTE/IRC/APP/032749 V06.03 / EN Approved Standard 28/Oct/2013 Page 128/290 Figure 11.1-8: SIR Target for theoretical assumptions with different alpha factor values

Looking to theoretical assumptions we have found that SET3 of values as something that could produce a similar UL throughput in Near cell environment compared to non-FPC case. As well as PL increases the UL throughput will smoothly decrease (around 93dB UL PL, compared to 110dB SET1&Alphafactor=1)

Figure 11.1-9: UL SIR Target for theoretical assumptions with different alpha factor values

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LTE/IRC/APP/032749 V06.03 / EN Approved Standard 28/Oct/2013 Page 129/290 Figure 11.1-10: Different alpha factor comparison (Throughput, PRB’s, SINR & PUSCH SINR Target)

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LTE/IRC/APP/032749 V06.03 / EN Approved Standard 28/Oct/2013 Page 130/290 NOTE: Comparing the SIR target collected with SIR target estimated in the theoretical approach.

This proves that Alcatel-Lucent power control mechanism works as expected.

The below comparison shows the UL throughput and TxPower comparison between the AlphaFactor=1 and AlphaFactor=0.7 for SET3. Out of this we can conclude that a SET3

(AlphaFactor=0.7) could be used when customers are requesting an high UL throughput in Near cell with a UL throughput decrease in late-mid cell and edge cell.

Figure 11.1-11: UL Throughput & UE TX Power vs. Path loss alpha factor 0.7 & 1 with set 3

Notes:

Alpha Factor=0.7 is a good compromise between UL Throughput and the TxPower used. Never the less, bigger the AlphaFactor, bigger the UL throughput for near&mid cells. Bigger the AlphaFactor, lower the UL throughput for edge cells (below ~110dB UL PL).

Nominal path loss impacts the UL throughput performances. Bigger the value, later the UL throughput decrease effect, but high the TxPower.

Having Max_SIR_targetForFPC greater than SIR_Target_Nominal will not help(if for e.g. Path loss nominal is equal 60dB, will not help to have max 20dB when target is 15dB).

Path loss nominal with value less than 60dB, is not useful. There are no commercial networks in which the less than 60dB is found.

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LTE/IRC/APP/032749 V06.03 / EN Approved Standard 28/Oct/2013 Page 131/290 SET 1 &AlphaFactor=1 is the template. It is a good setting combination for non-FPC and best performances in Near&Mid-Cell radio condition. We recommend this to be used for best performances.

SET1 & AlphaFactor=0.7 is a good trend between the UL throughput and UL interference. It is more suitable for commercials networks were customer vision needs a near&mid-cell not targeting the maximum or what Alcatel-Lucent product can offer to respect of lower interference.

SET3 & AlphaFactor=0.7&PathLossNominal = 85 looks a better UL throughput approach having as well the FPC on.

So high throughput in near&mid-cell radio conditions, but as well higher throughput in edge cell (compared to non-fractional power control). TxPower is a compromise between the SET1&AlphaFactor=1 and SET1&AlphaFactor=0.7 in Figure 11.1-14: UE TX Power vs. Path loss for set1 & set3 with alpha factor 0.7 and 1.

Figure 11.1-12: UL Throughput & UE TX Power vs. Path loss for alpha factor 0.7 for all sets

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LTE/IRC/APP/032749 V06.03 / EN Approved Standard 28/Oct/2013 Page 132/290 Figure 11.1-13: UL Throughput vs. Path loss for set1 & set3 with alpha factor 0.7 and 1

Figure 11.1-14: UE TX Power vs. Path loss for set1 & set3 with alpha factor 0.7 and 1

11.1.2.2 PUSCHPOWERCONTROLALPHAFACTOR COMBINATION TESTS