RF Planning Procedure

RF Planning Procedure for Greenfield Network

Copyright 2009 Aircom International (India) Pvt. Ltd.

Confidential not for circulation

Prepared by: Shailendra kumar

Page 1

1. INTRODUCTION Network Planning Plays a critical role in any cellular design process. Nominal planning is performed to generate basic site count for a new network which forms the foundation stone of that network. By doing a proper Network planning by keeping the future growth plan in mind we can reduce a lot of problem that we may encountered in future and also reduce substantially the cost of optimization once the network will be on full swing. On the other Hand a poorly planned network not only leads to many Network problems, it also increases the Capex and Opex once the network is live. In current low cost/revenue scenario we need to focus on smart and accurate planning to reduce the Capex and Opex during the whole project. Several mechanism and logics are implemented to address such issue which we will discuss in subsequent pages. It is important to remember that local regulation and company policies may change the process or certain step in process. The practices presented in this section serve the purpose of highlighting the important area in RF Design.

1. NETWORK PLANNING AND DESIGN PROCESS.The RF design process presented is a generic process for Greenfield/New Network. In this section RF designed process is described where as CORE&TRANSMISSION is described in other section. The RF design process consists of Two Phases.

Preliminary Planning Final Design Fed into the RF design process are the design requirements such as link budget and traffic prediction, and the output of the process is the RF system design(location of the cell sites, cell site parameters, coverage prediction, site sketches, drive test data. Steps need to be followed while planning new network CW Testing Model Tuning Nominal Planning RF Survey/Candidate Selection



Page 2

Flow Chart Radio Planning



Page 3

1. CW Testing The Aim of the CW measurements from field to calibrate Macro cell Propagation Model for Network for different model like a) Dense Urban b) CBD c) Urban,

d) Sub Urban e) Industrial.

Principally each model should have 5 Sites for accurate measurement, however some time it becomescustomer dependent. Few customer demands it with 3 sites per model to save the budget. The objective of CW Drive testing & Model Tuning is: a) To ensure accurate propagation Model b) Aim is to produce Zero Mean Error & Minimize the standard Deviation (Less than equal to 8) Propagaton Test Kit

The propagation test kit consists of Test transmitter. Antenna (generally Omni ). Receiver to scan the RSS (Received signal levels). The receiver scanning rate should be settable so that it satisfies Lees law. A laptop to collect data. A GPS to get latitude and longitude. Cables and accessories. Wattmeter to check VSWR.

A single frequency is transmitted a predetermined power level from the candidate site. These transmitted power levels are then measured and collected by the Drive test kit. This data is then loaded on the Planning tool and used for tuning models.



Page 4



Page 5

Steps to Follow while doing CW/Simulation Testing

Step s Step1 Step2 Step3 Step4

Activity Site Selection and Route Planning Hardware Installation Drive Testing and Data Collection Drive Length

Description This is the important part of CW testing as wrong selection will lead to bad results, therefore careful planning is crucial to achieve good results. Site selection should be in synch with customer. After site selection , hardware like Antenna, transmitter will be installed at site.AC main is required to energize the transmitter Radio receiver will be used to collect field measurement during drive testing. Drive tester will maintain average speed of 40 Km/Per Hour to get the better results. Since the drive will be conducted at higher frequencies therefore the drive route will less-75 Area Covered Coverage >-85 With

100.000 0.550 100.000

97.137 4.366 100.000

95.79% 12.573 99.96% 0.937 99.68%

% Area Covered With Coverage >-85

j)

Prediction Plot (CALICUT City)



Page 25

k) Summary 39 Sites Planned Outside the CALICUT City Polygon for Small Town & Highway out of which 03 Sites are not showing on the 2D view of Asset Tool.



Page 26

Total Sites Used to cover CALICUT City(polygon) 48 out of which 43 are sharing site, 05 other smalltown sites.

l)

Recommendations



Page 27

Nominal Planning done with electrical tilt of 2 deg since the city is along with coastal boundary therefore mechanical tilt of 2 deg is recommended for border cells For Highways and railways we had used 2 sector with high gain antenna and one sector with 65deg city antenna 2 New site required with this link budget and the Clutter requirement. Change in Orientation based on coverage requirement



Page 28

Documents

RF Planning Procedure