Civils major work activities and interfaces with other project
wind loading on aerials, dishes, radars, floodlights and cameras.
Line of Sight (LOS) is an important parameter in GSM network
planning and this will be established during the initial evaluation.
During the Site Identification and Acquisition stage,
utilize the team approach, benefiting from the professional services
of surveyors, engineers and the RF designers to ensure easy
acquisition and suitability for building and construction. This
coordination by maximizing local knowledge, ensures faster
deployment made seamless through the integrated process.
BTC site mapping service involves the production of plans which are
referenced using the Global Positioning System (GPS). The site plans
last the lifecycle of the site, for which the structural and
electrical design is based. Additionally these site plans are the
basis of construction plans and the ‘as-built’ plans. The service
also delivers a detailed report of a selected site after a full
analysis of requirements including local and environmental
conditions. The report includes drawings, photographs and video
where appropriate and proposes how the site can best accommodate the
planned equipment. Suggestions of recommended changes to the site
are made to ensure optimal configuration and performance.
provides specialist professional/technical advice and support for
the design of masts and towers and other wind sensitive structures.
This covers three main types of site - existing towers, Greenfield
and Rooftop. In the initial assessment, technical inspections of
structures are made within the constructural parameters required.
Further analysis can be provided using 3D models with dedicated
software to determine forces and stresses, ensuring structural
integrity. The design check includes an assessment of additional
equipment that is needed for installation, for example specialist
head frames for buildings and rooftops, and recommend any requisite
strengthening work to satisfy the proposed loading. The design of
any new structures can be carried out according to your
requirements. For Greenfield sites geotechnical studies are
undertaken. Throughout this process, activities will be managed to
co-ordinate the feasibility, planning, design and construction of
networked towers as well as providing on-site supervision of
contracts. Cabin design is commensurate with individual needs and
integrated within the overall design plan.
Mechanical and Electrical Design
This service covers the design of electrical layout, power, all
cabling, lightning protection and earthing systems. If necessary,
prospective communications sites will be surveyed and quotations
will be obtained from regional electricity companies for connection
of new supplies, resolving any remote supply problems. When existing
sites are used, ancillary equipment will be appraised to ensure
compatibility with new equipment proposed. This could include fire
alarm systems, land lines and specific lightning protection systems.
Environmental issues are also considered and should air conditioning
be a requisite, the necessary plant will be procured. This phase of
the project will result in the preparation of detailed construction
Civil Works and Construction Management
employs professionally qualified Surveying and Engineering staff to
manage and coordinate all site operations with a full understanding
of the design requirements. Depending on whether the chosen site is
a ‘green field’ or part of an existing building such as a roof top,
appropriate structures will be built. The extent of the works may
include reinforced concrete tower and cabin bases, compound
clearance and storing, site fencing, cabin fixing, rooftop fixings
and steelwork, power supply and coordination, electrical connections
and earthing and cable tray installations. Towers are sometimes
required for mounting the RF and microwave antennas and could range
from roof mounted stubs to ground based lattice towers. Size will be
dependant on the surrounding terrain and also issues such as the
spacing of the antennas for spatial diversity, the number of
antennas and the prevailing weather conditions, especially wind
levels. Masts and towers will be deployed to minimize impact on
their surroundings, ensuring environmental acceptance and aesthetic
design. All work on site will be controlled and co-ordinated by the
construction team with input from the design team to ensure the
design intent is maintained. Quality checks will ensure
specifications are upheld and local Building Regulations approval is
attained. All procedures and working methods have been streamlined
to improve the services delivered, minimizing the delivery time
whilst maintaining quality. On completion of any construction
work each site will be visited to ensure that the work has been
carried out as specified and that the quality of the installation
meets your requirements.
Solid Base to Build On
From preparation and engineering to implementation, verification and
integration, Base Tower Contracting Est. can deliver full service
networks including full turnkey delivery for new network operators.
Professional Services provides capabilities in all disciplines of a
network construction project offering numerous benefits:
A single contact for a complete solution for complex network needs.
Easier budgeting with all costs known at the planning stage.
Project tracking and monitoring to manage contingencies and minimise
risk. BTC recognizes the importance of a rapid and co-ordinated
delivery of new network capabilities, enabling you to gain early
return on your network investment. BTC ’s Professional Services
can expedite all site related processes, providing added value to
get you off to a good start. We will do the groundwork to leave you
free to concentrate on what is important to your business – your
serving network and growing customer base.
Antennas used for the transmission and reception of electromagnetic
radiation are essential for the air interface of cellular networks.
Key antennas types for cellular network applications are
directional, with typical horizontal beam-widths of 65 and 90
degrees and omni-directional, which will radiate equally in all
directions in the horizontal. Increasingly important for minimizing
antenna configurations in diversity applications are dual slant
polarized sector antennas which can accept two transmit/receive
feeds. The market for dual band (GSM 900 and 1800) antennas is
becoming more and more evident and Base Tower is continually
installing new products.
An external power plant is required when the customer wants to use
DC network equipment but has only mains DC available. The plant
will, for example, take a 220V AC input and deliver DC power at 48V
potential, if required by network equipment. The power supply system
consists of a power supply cabinet and a battery cabinet/additional
battery rack. The system power is backed up by battery and during
normal operation the power for the network equipment is taken from
the mains and the batteries will be continuously charged (trickle
charge operation). In the event of mains failure, the power will be
taken from the connected backup battery. The system also
incorporates breakered distribution and controller/alarms
incorporating mains or phase failure, battery deep discharge and
rectifier failure detection.
Various types of cables are required for services and
interconnections within the network, these fall into four main
categories: i. Power cables for supply of AC and DC power to all
network elements ii. Grounding/Common cables iii. RF cables for
feeders and jumpers iv. Data cables for various interconnections.
Coaxial and 120 Ohm 2Mbit cable for Abis and M interfaces, 64kbit
cable for external alarms, RS232 and X.21 and V.35 cables for OMC
A container or shelter is necessary to protect the network equipment
and ancillary equipment as well as facilitate a controlled
environment with an air conditioning unit. Other equipment and
facilities typically housed in the container includes alarm control
panels, tower lighting control, transmission equipment and power
only ship containers where it is appropriate to do so, ensuring that
they are fit for the environment in which the equipment is to be
deployed, taking into account earthquakes, hurricanes etc.
In cellular systems, repeaters can be used to enhance the influence
of a base station in regions where, due to topological conditions,
poor field strengths impair communication. Typical examples are
tunnels, subways, shopping malls, valleys and mountainous regions.
In these instances, repeaters provide a low-cost flexible
alternative to base station deployment. In addition, repeaters can
often provide a low cost solution in low traffic areas.
As part of an overall project deployment, and an important
consideration during the construction phase, the supply of what may
be termed ‘ancillary equipment’ fulfils the requirement for a
turnkey solution. Base Tower is served by a number of global, best
in class, preferred suppliers of ancillary equipment and by taking
into account the local and environmental conditions, we can ensure
that the best materials and most appropriate products are used.