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Base Station Verification at Cell Tower Site

Posted @ January 14, 2014, 10:19 am under (Fixed Assets Verification)

We are engaged in Physical Verification of Telecom and Tower Equipment covering whole of Rajasthan, Haryana, Punjab and Madhya Pradesh, Gujrat. Our field staff is technically updated and conversant with equipments installed at cell site and having hands on experience of cell site physical verification.  
 
Update on BTS Site 
 
A BTS site is critcal for transmission of telecom signals. The site consists of certain equipments which are required to be verified periodically. This brings the need of BTS Site audit by technically competent team. On the other hand every subscriber demands for congestion free network with no call drops and blocking. To satisfy the subscriber demand, Cell site Audit team aims keep track of equipments and realted site. 
 
GSM network (cellular network) divided into different sectors is comprised of a Mobile Station (MS) which is connected to the Base Transceiver Station (BTS) via air interface. BTS also contains the equipment called Transceiver (TRX or TRU), which is responsible for the transmission and reception of several radio frequency (RF) signals to and from the end users. BTS is further connected to the base station controller (BSC) through an Abis interface. BSC handles radio resource management and handovers of the calls from one BTS to the other BTS in it. BSC is then connected to Mobile Switching Centre (MSC). 
 
There are different manufacturers of BTS equipments like Ericsson, Nokia and Siemens but a single telecom circle uses the BTS of only one manufacturer for a given circle. The telecom BTS can be of three types as indoor BTS, outdoor BTS and tower top BTS. Indoor BTS are placed inside prefab or concrete shelter with air conditioning as a much needed requirement. Outdoor BTS are installed at open over a foundation. Tower top BTS can be mounted on wall, tower or a pole. The telecom towers have GSM antennas, microwave antenna and 3G antennas as well. 
 
 
Antennas may also be considered as components of BTS in general sense as they facilitate the functioning of BTS. Typically a BTS will have several transceivers (TRXs) which allow it to serve several different frequencies and different sectors of the cell. 
 
 
 
A BTS in general has the following parts:
 
Transceiver (TRX)
 
Quite widely referred to as the driver receiver (DRX), DRX are either in form of single (sTRU), double(dTRU) or a composite double radio unit (DRU). It basically does transmission and reception of signals. It also does sending and reception of signals to and from higher network entities (like the base station controller in mobile telephony).
 
Power amplifier (PA)
 
Amplifies the signal from DRX for transmission through antenna; may be integrated with DRX.
 
Combiner
Combines feeds from several DRXs so that they could be sent out through a single antenna. Allows for a reduction in the number of antenna used.
 
Duplexer
For separating sending and receiving signals to/from antenna. Does sending and receiving signals through the same antenna ports (cables to antenna).
 
Antenna
This is the structure that lies underneath the BTS; it can be installed as it is or disguised in some way (Concealed cell sites).
 
Alarm extension system
Collects working status alarms of various units in the BTS and extends them to operations and maintenance (O&M) monitoring stations.
 
Control function
Controls and manages the various units of BTS, including any software. On-the-spot configurations, status changes, software upgrades, etc. are done through the control function.
 
Baseband receiver unit (BBxx)

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