Link budget

Abbreviations:

Pinm : Power received at the MS side ; Mf : Loss suffers from fading and other residual losses.

Poutb :Transmitter output power; Lcb : Loss in combiner ; Lfb : Loss in feeder; Gab : BTS antenna’s gain ; Ld : Path Loss

Gam : MS antenna’s gain ; Pmn : Noise suffered at the MS side ; Pinb : Power received at the BTS side

Pout : MS output power ; GdB : BTS antenna diversity gain ; Pbn : Noise suffered at the BTS side

Downlink path consideration :

Pinm (–102dBm) + Mf = Poutb － Lcb －Lfb + Gab －Ld + Gam － Pmn   ------------  （1）

Uplink path consideration :

Pinb + Mf = Poutm +Gam －Ld +Gab + GdB － Lfb －Pbn   ------------  （2）

Assume :

Pmn   = Pbn ; Poutb = Poutbal ; Pinm   = Mssens ; Pinb  = BTSsens

From (1) and (2), we get :

Poutb – Pinm   = Poutm + GdB – Pinb + Lcb  ==>

Poutbal   = Poutm + GdB + Lcb + ( Pinm – Pinb )  ==>

Poutbal   = Poutm + GdB + Lcb + ( MSsens – BTSsens )

Footnote :

Poutbal denote the BTS output power when link budget is achieved.

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Coverage of special area

 

Adopt distributed antenna in high building

•tunnel、subway、underground

•industrial and commercial area

•high-rise

•blind area  

Antenna selection

The choice of antenna has an important effect on the network coverage. 

The requirements on antenna :

1)Satisfying the coverage area. AND

2)Does not cause interference to other cells.

The key considerations of the antenna are :

1) Antenna gain.

2) Antenna  azimuth

3) Antenna polarization

Different choice of antenna is being used in the following situations :

1) urban, sub-rural and rural area

2) Mountain, flat land ( sea ), highway and tunnel area

3) Building interior

Common antenna supplier :

Andrew、Allgon、Antel、 Kathrein、and etc

 -coverage area characteristic

 

-Common antenna product

 

How to Choose An Antenna

•How to Choose An Antenna is an important part that may determine the network quality.

•Antenna shall be selected as per the coverage, service quality requirements within the base station service area, traffic distribution, topographic, landscape conditions,  and  consideration to the coverage and interference details of the entire network;

•The usage of antennas may be divided into the following types according to the topographic conditions or traffic distribution:

Urban, suburb, rural area, highway, hilly area, coastal area, tunnel, indoor, etc.