WCDMA Power Calculation Guide

WCMDA POWER CALUCLATION GUIDE

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WCDMA Power Power Calculation Guide Muhammad Usman Khalid Khan / m0026399 WCDMA !etwor" !etwor" U# $radation Pro%ect

WCDMA Power Calculation Guide

Abstract ： The abstract of this guide is related to Power

calculation including Max Power of Cells and all associated common control channels in UMTS. The reason for writing this guide as it would be very helpful when you will upgrade your software version like from !" to !# or later$ to avoid upgrade fails because the maximum transmit power of a cell is lower than the sum of the transmit power of channels in the cell. %lso it will give you a better understanding of power which is shared among many channels. &e have to upgrade our software version from '()))!"C#)) to '()))!#C)) so we have to check in the said UMTS *etwork that the comparis comparision ion of CellMaxTxP CellMaxTxPower ower to Total number number of downlink downlink Channels powers before execution. This guide contains the idea behind how the calculation has been done done in all all our our netw networ ork k to avoi avoid d acti activi vity ty fail failur ure e and and give give good good perception of Power in &C+M%. Keyword Keywords: s: Power$ Control channels$ adio$ Planning$ ,ptimi-ation$

$ Upgrade

1 !ituation

There are total !!"/ sites in this UMTS network and di0erent Maxi Maximu mum m tran transm smit it powe powers rs are are set set in the the netw networ ork. k. The The powe powerr 2016-02-11

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calc calcul ulat atio ion n has has to be done done on ever every y cell cell which which re1ui e1uirres some some strategy to 1uickly complete this task e0eciently. %ll this mentioned in the later part of this guide how calculation done and what was the criteria. 2efore going in the details here is the information of all the channels which have been used in the calculation. •

Maximum Transmit Power of Cell Sum of the maximum transmit power of all +3 channels in a cell. To To fetch this information from from M4))) the command is as follows LST UCELL: LstType=ByCellId, CellId=11234;

•

P5CP6C7 Transmit Power of Cell T8 power of the P5CP6C7 in a cell. This parameter should be set based based on the actual actual system system envir environm onment ent such such as cell cell coverag coverage e 9radius: and geographical environment. or the cells to be covered$ the downlink coverage must be guaranteed. or the cells re1uiring soft handover area$ this parameter should satisfy the proportion of soft handover areas stipulated in the network plan. The value of this parameter must satisfy the following relationship;

*ote; The P5CP6C7 transmit power must be higher than the minimum pilot power and lower than the maximum pilot power.

•

P6C7 Power ,0set and %6C7 Power ,0set P6C7 Power ,0set is the di0erence between the transmit power of P6C7 and that of PCP6C7

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%6C7 Power ,0set is the di0erence between the transmit power of an %6C7 and that of PCP6C7. To To fetch this information from from M4))) the command is as follows LST UCHPWROFFSET: CellId=11234;

•

2C7 Transmit Power This is the ,0set of the 2C7 transmit power from the P5CP6C7 transmit power in a cell. 6f the value is set too small$ the U?s on the cell cell edge edge cann cannot ot rece receiv ive e the the syst system em messa message ges s prop proper erly ly.. This This problem a0ects the coverage of the downlink common channel and furthermore the coverage of the cell. 6f the value is set too great$ it caus causes es inte interfe rfere renc nce e to othe otherr chan channel nels$ s$ occu occupie pies s the the down downli link nk transmit power$ and a0ects the cell capacity. capacity. To To fetch this information from from M4))) the command is as follows LST UBCH: CellId=11234;

•

PSC7 Transmit Power This is the ,0set of the PSC7 transmit power from the P5CP6C7 transmit power in a cell. 6f the value is excessively low$ U?s at the edge edge of cells cells fail fail in networ network k searc searchin hing$ g$ resul resultin ting g in in@uen in@uence ce on coverage of the downlink common channel. This Anally a0ects the cell coverage. 6f the value is excessively excessively high$ the power resources resources are wasted$ and other channels are interfered seriously$ thus the cell capacity is in@uenced.

To To fetch this information from M4))) the command is as follows LST UPSCH: CellId=11234; •

SSC7 Transmit Power

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This is the o0set of the SSC7 transmit power from the P5CP6C7 transmit power in a cell. 6f the value is excessively low$ U?s at the edge edge of cells cells fail fail in networ network k searc searchin hing$ g$ resul resultin ting g in in@uen in@uence ce on coverage of the downlink common channel. This Anally a0ects the cell coverage. 6f the value is excessively excessively high$ the power resources resources are wasted$ and other channels are interfered seriously$ thus the cell capacity is in@uenced.

To To fetch this information from M4))) the command is as follows LST USSCH: CellId=11234;

•

PC7 Transmit Power This is the o0set of the PC7 transmit power from the PCP6C7 transmit power in a cell. 6f the value is set too small$ the U?s on the cell edge cannot receive the paging message me ssage properly. properly. This problem a0ec a0ects ts the cover overag age e of the the down downli link nk commo ommon n chann hannel el and furthermore the coverage of the cell. 6f the value is set too great$ it caus causes es inte interfe rfere renc nce e to othe otherr chan channel nels$ s$ occu occupie pies s the the down downli link nk transmit power$ and a0ects the cell capacity. capacity.

To To fetch this information from M4))) the command is as follows LST UPCH: CellId=11234;

•

Maximum %C7 Transmit Power and %C7 6+s This is the o0set between the %C7 transmit power and P5CP6C7 transmit power in a cell. 6f MaxachPower is set excessively low$ a U? positioned at the cell edge may fail to receive the services and signaling carried over the %C7$ in a correct way. This will impact the downlink common channel coverage and thus the cell coverage.

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6f Max MaxachPo achPower wer is set exces excessiv sively ely high$ high$ other other channe channels ls will will be interfered and more downlink power resources will be occupied. This will conse1uently impact the cell capacity. capacity. %C7 6+ is used to uni1uely identifying a %C7 bearing the common transport channel in a cell.

To To fetch this information from M4))) the command is as follows LST UFACH: CellId=411;

•

*umber of %6C7s. The deAned number of %6C7s can be identied identied through %6C76+. To To fetch this information from from M4))) the command is as follows LST UAICH: CellId=11234;

•

Maximum Transmit Power and Minimum Transmit Power of P5 CP6C7 Maxi Maximu mum m T8 powe powerr of the the PCP6 PCP6C7 C7 in a cell cell.. This This sett settin ings gs should be set based on the actual system environment such as cell coverage 9radius: and geographical environment$ and the cell total power. &hen the ratio of soft handover areas keeps the same$ the downlink coverage cannot be promoted by the increase of PCP6C7 power. Minimum T8 power of the PCP6C7 in a cell. This parameter should be set based on the actual system environment such as cell cell cove covera rage ge 9rad 9radiu ius: s: and and geog geogra raph phic ical al envi envirronme onment nt.. ?nsure that MinPCP6C7Power is set under the condition of a prop proper er prop propor orti tion on of sof soft hand handov over er area area$$ or unde underr the the condition that no coverage hole exists. To To fetch this information from M4))) the command is as follows

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LST UPCPICH: CellId=11234;

" Analysis %s 6 menti mention oned ed abov above e to avoi avoid d dis discr crep epan ancy cy in powe powerr calc calcula ulati tion on the the strate strategy gy has been been develo developed ped which which divide divided d in di0ere di0erent nt combina combinatio tions ns accordi according ng to the deAned deAned Maximu Maximum m transm transmit it power power settin settings gs which which has been been disc discus usse sed d in the the late laterr part part.. 6n this this part part the the form formul ulas as has has been been mentioned which have been used in the calulation. This all is based on +ownlink channel mapping based on the below diagram.

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ormulas Used 2elow are the formulas which has been used in the calculation$ refer attached excel also in case of any confusion. C?33 M%86MUM T%*SM6T P,&? B P,&? 9!)$9M%8T8P&!):!): PCP6C7 B P,&? 9!)$9PCP6C7!):!): P6C7 B P,&?9!)$9P6C7DCP6C7!):!): %6C7 B P,&?9!)$9%6C7DCP6C7!):!):E*um of %6C7 2C7 B P,&?9!)$999M%892 P,&?9!)$999M%892C7$PSC7$SSC7:DPCP6C7::!)!):: C7$PSC7$SSC7:DPCP6C7::!)!):: %C7 B P,&?9!)$999M%89%C7$PC7:DPCP6C7::!)!)::E*um of %C7 T,T%3 T,T %3 C,MM,* C7%**?3 P,&? B PCP6C7DP6C7D%6C7D2C7D%C7 PCP6C7DP6C7D%6C7D2C7D%C7 COMPARE CELL MAXIMUM TRANSMIT POWER WITH TOTAL COMMON CHANNEL POWER

IF MAXIMUM TRANSMIT POWER >= TOTAL COMMON CHANNEL POWER → PASS IF MAXIMUM TRANSMIT POWER < TOTAL COMMON CHANNEL

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POWER → FAIL

PowerFormula.xlsx

# Wor$in% !trate%y The mapping m apping between Maximum Transmit Transmit Power and all downlink channel power has been done with di0erent combinations or scenarios. The di0erent combinations are based on Maximum transmit power which are currently using in this UMTS network. irst all the relative data of all sites has been gathered in one sheet by di0erent commands as mentioned above through latest CGMM3s of all *Cs. 2elow mentioned depicts the same.

6n the above diagram the columns highlighted with yellow are constant in

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this network and set on one value only. only. %fter processing the above data it has been observed that there were H di0erent types of MaxT8Power set in the network so we need at least H combinations to cross check whether the maximum transmit power of all cells is greater or e1ual to other common channels. urther calrify here that every time the MaxT8P& will be change and correspondingly the maximum power of the other downlink channels and max number 9%C7 9%C7 I %6C7 6+: will be selected.

Combiatio ! "#

6n combination ! the highest set power has been taken which is "() d2m correspondingly the cell whose CP6C7 power is highest according to this Alter which is JK) has been taken$ the reason to select the highest CP6C7 Power ower is beca becaus use e of this this has has the the high highes estt weig weight htag age e in the the powe powerr calculation means this will consume max power also the same strategy has been setup with other channel powers to check the peak case. %fter calculation as per the above formulas it has been concluded that Cell Maxi Maximu mum m trans transmit mit powe powerr is great greater er than than the the tota totall chan channe nell powe powerr as re@ecting in the below table.

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Power &' Cell(d)m* CellMa-.-Power PCPC PC AC )C 7AC P8C 88C PC !um o' AC !um o' 7AC Ma- o' PCPC Min o' PCPC .otal o' Channels

90 360 5 56 520 40 50 50 520 4 2 390 30


+esult（m,） 932123 39140406 932123 4000 24411632 400236

413440340

Combiatio! Combiatio! "$

The same strategy we use in the next round select the next MaxT8Power of "/H and selecting its corresponding max values of CP6C7 power P6C7$ %6C7$ 2C7$ %C7 %C7 and other common channels. ,ne thing which is signiAcant to notify here that the *umber of %C7 and *umber of %6C7 is important in the calculation as if their number is any comb combin inat atio ion n thei theirr weigh weightt age age will will be high high in the the calc calcul ulat atio ion n whic which h is prominent in overall a0ect.

Power &' Cell(d)m* CellMa-.-Power PCPC PC AC )C 7AC P8C 88C PC

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1 310 5 56 520 40 50 50 520

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+esult（m,） 6029164 63093 4219242 41193492 39 39140406 4 4116669

Pae10! "otal1#



!um o' AC !um o' 7AC Ma- o' PCPC Min o' PCPC .otal o' Channels

4 2 343 36 29024021

Ot%&r Combiatios Combiatios

,the ,therr all all remai remaini ning ng K comb combina inati tion ons s has has ment mentio ioned ned belo below w based based on changing max tx power and its corresponding maximum values of other common channels. The result is based on on above mentioned formulas.


Power &' Cell(d)m* CellMa-.-Power PCPC PC AC )C 7AC

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+esult （m,）

60 390 53 56 520 40 50 50 520 4 2 0 30

39140406 932123 39140406 49926234 0 04412336 20000

3193411

+esult （m,）

1 360 5 56 520 40

3049942 39140406 932123 4000 2 24411632 40 400236

Pae11! "otal1#


P8C 88C PC !um o' AC !um o' 7AC Ma- o' PCPC Min o' PCPC .otal o' Channels


Power &' Cell(d)m* CellMa-.-Power PCPC PC AC )C 7AC 2016-02-11

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50 50 520 4 2 31 32 413440340

+esult （m,）

 30 5 56 520 40 50 50 520 4 2 00 30

29420922 04412336 4000 4219242 3462266 42 426494619

23022223

+esult （m,）

30 360 5 56 520 40

49926234 39140406 932123 4000 2 24411632 40 400236 Pae12! "otal1#


P8C 88C PC !um o' AC !um o' 7AC Ma- o' PCPC Min o' PCPC .otal o' Channels


Power &' Cell(d)m* CellMa-.-Power PCPC PC AC )C 7AC P8C 2016-02-11

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50 50 520 4 2 31 30 413440340

+esult （m,）

30 260 5 56 520 40 50 50 520 4 2 21 22

04412336 39140406 932123 400 2 24411632 40 400236

413440340

+esult （m,）

330 260 5 56 520 40 50

49926234 39140406 932123 400 2 24411632 40 400236

Pae1$! "otal1#


88C PC !um o' AC !um o' 7AC Ma- o' PCPC Min o' PCPC .otal o' Channels


50 520 4 2 21 22 413440340

rom rom all all the the abov above e calc calcula ulati tion ons s it has has been been depic depicte ted d that that Maxi Maximu mum m transmit power is greater in every scenario from the total channel power hence all the results are in i n pass category. category. 6n case if you And the Maximum transmit power of a cells is less than common common contr control ol channe channell power power then then either either you have have to incre increase ase the maximum transmit power or you have to reduce CP6C7 power to avoid any issue.

&' (n a Nutshell ) !ummary 7ere 6 would like to mention that this guide would be very helpful while doing some immense activities to avoid failure. %lso you can have the better understanding of Power conAguration in &C+M% which will give you good good visibi visibilit lity y during during optimi optimi-at -ation ion and planni planning ng phases phases that that tuning tuning of power and its consumption. 6 hope this guide book will be helpful and interesting for all concerned colleagues.

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WCDMA Power Calculation Guide

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