Range for GSM 900, 1800 and WCDMA

By Espen Steine

GSM 900

Frequency range : 880 – 915 Mhz Mobile 935 – 960 Mhz Base Station

Outputpower: 4 classes

2) 8 W (39 dBm) 3) 5 W (37 dBm) 4) 2 W (33 dBm) 5) 0,8 W (29 dBm)

Threshold : 102 dBm

GSM 1800

Frequency range : 1710 – 1785 MHz Mobile terminal 1805 – 1880 MHz Base Statione

Output power : 3 classes

1 – 1W (30 dBm) 2 – 0,25 W (24 dBm) 3 – 4 W (36 dBm)

Threshold : 102 dBm

WCDMA

Frequency range : 1920 – 1980 Uplink 2110 – 2170 Downlink

Output power : 125 mW (speech) 250 mW (data)

Threshold -117 dBm

How to find range theoretically

Parameters we know: Output power Threshold Antenna gain

From the parameters we can find the biggest path loss possible for communication Use atennuation models that use distance as parameter.

Linkbudget

GSM 900 GSM 1800 WCDMAOutputpower 33 36 23,98Antenna gain rx 15 15 15Fading margin 15 15 15Threshold -104 -102 -117Path loss -137 -138 -140,98

Given this free space loss, the distance can be calculated from the formula:92,4 + 20log(f) + 20log(d)

Range in LoSGSM 900 190,81 kmGSM 1800 111,43 kmWCDMA 140,18 km

First paper

The first paper i will present is:”A Survey of Various Propagation Models for

Mobile Communication” by Tapan K. Sarkar', Zhong Ji', Kyungjung Kim', Abdellatif Medour?, and

Magdalena Salazar-Palma3

Survey of Various Propagation Models for Mobile Communication

Enviorments

Line of sight Free space attenuation Multipath and other interference

Urban enviorments Often NloS Reflections

Indoor transmission Short distance Many reflections and obstacles

Outdoor to indoor transmission Where there is no indoor cell people still expect

covarege

Coverage models

Use statistical models, due to the complexity of the deterministic models.

Outdoor propagation Model used:

Hata

HATA model

DistanceGSM900 0,08 km

GSM 1800 0,02 kmWCDMA 0,02 km

- a(hre) + (44.9 – 6.55 log (hte) ) log( d ) L (urban)( dB) = 69.55 + 26.16 log ( f ) - 13.82 log( hte )

a (hre) = (1,1 log ( f ) - 0.7) hre – (1.56 log ( f ) - 0.8) dB

Results

Technology Free Space HataGSM 900 852 0,08 kmGSM 1800 626 0,02 kmWCDMA 788 0,02 km

Papers

”Downlink Propgation Measurements in the GSM 900 and 1800 Mhz Bands” by Ahlberg, Lindmark, Simons and Beckman Comparasing of the two bands

”Simulated and Measured WCDMA Uplink Performance” by Holma, Soldani and Sipilä Meaure the different models of mobile stations. Compare it to measurement to theoretic.