TRX Guide line

For Excess, Surplus TRX calculations

Revision A

Introduction

• Earlier preparation for TRX addition is highly needed to avoid congestion.

• Therefore it is needed to identify future Capacity requirement well in advance (Before cell gets congested) so that we will have time to act.

• Identification of excess TRX is also very important since TRX will consume power leading to unwanted OPEX.

TRX Guide Line• For TRX calculations below parameters are considered

– HR Penetration– Utilization Factor– Number of existing TRX– Number of PDCH TS / sector

TRX Guide Line – Worksheet (Double click to change)

DescriptionExcess TRX capacity limit

TRX addition Capacity limit

HR Penetration 50% 90%utilization factor 70% 85%Number of TRX 2 2PDCH 1 1Total TS 16 16BCCH 1 1SDCCH 2 2TS remaining 12 12HR TS 6 10FR TS 6 2equivalent TS 18 22traffic for 2 % GOS (E) 11.49 14.90Traffic capacity for decision 2% 8.04 12.66traffic for 5 % GOS (E) 13.39 17.13Traffic capacity for decision 5% 9.37 14.56

TRX calculation based on 2 TRX and 1 PDCH

TRX Guide Line – Worksheet (Double click to change) Cont.…

DescriptionExcess TRX capacity limit

TRX addition Capacity limit

HR Penetration 50% 90%utilization factor 70% 85%Number of TRX 3 3PDCH 1 1Total TS 24 24BCCH 1 1SDCCH 3 3TS remaining 19 19HR TS 9 17FR TS 10 2equivalent TS 28 36traffic for 2 % GOS (E) 20.15 27.34Traffic capacity for decision 2% 14.11 23.24traffic for 5 % GOS (E) 22.87 30.66Traffic capacity for decision 5% 16.01 26.06

TRX calculation based on 3 TRX and 1 PDCH

TRX Guide Line – Conclusion

• If the TRX addition for the cell is identified on above threshold, it will be possible to add TRX before it get congested.

Current TRX cofiguration

Remove if BH traffi c less than

Add if BH traffi c less than

2 Min Config 12.663 8.04 23.244 14.11 33.425 21.06 43.86 27.53 55.13

TRX Guide Line – Conclusion

• It has to be noted that need of a new capacity site should be identified if cell BH carried traffic exceeds,– For GSM : 33.42 E– For DCS : 55.13 E

• If these threshold are reached it can be concluded that congestion can not be eliminated by TRX addition.

Thank you