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RADIO NETWORK DIMENSIONING(CASE STUDY)

Anand Alexander

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By the end of this session, the participants will be able to:

Manually dimension iteratively a WCDMA RAN

Dimension for Channel Elements

Objectives

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Dimensioning Flow

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Uplink Capacity

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Cell Load

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Statistical Multiplexing - CS services

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Erlang B - Complete Partitioning

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Statistical Multiplexing

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Best Effort for Packet Data

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COVERAGE /CAPACITY

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Link Budget for Uplink

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Log Normal Fading Margin Calculation

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Channel Model

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From Path Loss to Number of Sites

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Downlink Mpole Equation

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Downlink Curves

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Downlink Coverage/Capacity Urban

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A0 curves as a Function of Environment

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Downlink Margin

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DL Margin for Services with Different Path Loss

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DL Margin for Services with different C/I target

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CHANNEL ELEMENTCALCULATION

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Hardware Boards

A Channel Element is the required baseband processing capacity and

hardware for one Speech connection.

TX board

The Transmitter (TX) board handles functions like CRC handling, channel

coding, interleaving, spreading, rate matching.RX board

The Receiver board handles functions like demodulation, rake receiving,

de-spreading, de-interleaving, decoding and CRC evaluation.

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CE Requirements (per Service Data rate)

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CE Calculation

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CASE STUDY

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Input Data

2% G.o.S

BE for Packet

Mobile Class IV, 21 dBm

30 m BTS Antenna height

18,0 dBi BTS antenna gain

Indoor margin of 18 dB

95% Area Coverage Probability

=> LNFmarg = 9,0 dB

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Estimate an Initial UL Loading Figure

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Calculate UL Capacity

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Calculate UL Capacity

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Estimate Site Count for UL Capacity

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Link Budget (Example - 20% load)

Ch k f UL C /C i B l ?

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Check for UL Coverage/Capacity Balance?

Ch k M DL L d

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Check Max. DL Load

Are UL Sites S fficient ?

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Are UL Sites Sufficient ?

Channel Element Dimensioning

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Channel Element Dimensioning

Channel Element Calculation

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Channel Element Calculation

Channel Element Dimensioning

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Channel Element Dimensioning

Final Result

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Final Result

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Question and Answers

Discussion