Capacity Dimensioning for 3G

HSDPA Dimensioning SINR=SF X (PHSDPA/[P_tot(1-ά+(1/G))] SF: Spreading Factor of HSDPA -16PHSDPA: Allocated TX power to HSDPA max 38 dBm. P_tot: is total Tx power ά:orthogonality factor G: is geomtry factor G=Ioc/Ior

WCDMA Capacity Dimensioning Legend Team

• Traffic Model – Voice • AMR 12.2 Kbps

– CS Data • 64Kbps

– PS Data • 64Kbps • 128Kbps • 384Kbps

• System Load – The meaning of system load is different from UL and DL, for the UL it means the maximum interference caused due to the traffic generated by the different users, and for the DL it means the maximum power could be accommodated by the cell.

• Mpole – Is the maximum number of simultaneous users could access the system for a certain service – N user (per service)= Mpole * System Load

• One service Capacity dimensioning – HOW TO CALCULATE MPOLE • UL SPECIFY THE SERVICES AND THE USER CATEGORY • DL SPECIFY THE SERVICE AND THE USER CATEGORY

UL MPOLE

W: Chip Rate Rb: Bearer Rate V: Voice activity factor (for voice= 0.6 and for data =1) α: interference factor α= I-other / I-own = 0.3

DL MPOLE V: activity factor W: Chip Rate Rb: Bearer Rate Ioc/Ior: interference factor

Number of users based on Ec/Io

Adjusted Ec/Ior

UL examples VOICE

VIDEO

PS 64Kbps

DL examples VOICE

Voice Based on Ec/Io

CS 64Kbps

PS 128Kbps

PS 384Kbps

PS 64Kbps

• Mixed services capacity dimensioning – UL

– DL

Examples

Load Calculation

CE calculation