Tài liệu Urban Wireless Coverage Street-Level Service docx

CASE STUDY
Urban Wireless Coverage
Street-Level Service
Background
The increase in popularity of wireless devices has caused mobile
subscribers to demand coverage anytime and anywhere. Wireless
service providers are challenged with cost-effectively providing adequate
coverage and capacity precisely where it is needed. This is particularly
difficult in urban areas due to zoning restrictions and congestion from
tall buildings that limit the placement of cell sites for additional capacity.
The Problem
A global wireless service provider was providing service to a busy urban
area in Manhatten. The existing cell site was located on the 12th story
of a 14-story building at the intersection of two busy streets. Three
sectors of the cell site were being used to provide macro coverage,
with antennas located on the roof of the building. A fourth sector
was used to provide street-level coverage via an analog fiber transport
system, with antennas located on the side of the building. However, the
coverage in the area was not adequate to meet subscriber needs.
The ADC Solution
ADC leveraged the existing cell site by installing its all-digital Digivance
®

Long-Range Coverage Solution (LRCS) to replace the analog transport
system. Digivance LRCS uses patented digitized RF transport technology
to extend seamless wireless coverage from existing cell sites to hard-to-
reach areas or distribute capacity from centralized radio suites.
CASE STUDY
Web Site: www.adc.com
From North America, Call Toll Free: 1-800-366-3891 • Outside of North America: +1-952-938-8080
Fax: +1-952-917-3237 • For a listing of ADC’s global sales office locations, please refer to our Web site.

ADC Telecommunications, Inc., P.O. Box 1101, Minneapolis, Minnesota USA 55440-1101
Specifications published here are current as of the date of publication of this document. Because we are continuously
improving our products, ADC reserves the right to change specifications without prior notice. At any time, you may
verify product specifications by contacting our headquarters office in Minneapolis. ADC Telecommunications, Inc.
views its patent portfolio as an important corporate asset and vigorously enforces its patents. Products or features
contained herein may be covered by one or more U.S. or foreign patents. An Equal Opportunity Employer
103210AE 7/06 Revision © 2006 ADC Telecommunications, Inc. All Rights Reserved
The Digivance LRCS Host Unit was installed
in a 19-inch rack alongside the radios in the
12th floor cell site. Four radios were connected
to the host unit. ADC’s wavelength division
multiplexing (WDM) feature allowed the service
provider to reduce the number of fiber cables
required, keeping additional fibers free for other
applications.
The Digivance LRCS Remote Unit was installed in
the basement of the building. The versatility of
the system allowed the service provider to choose
to have the unit wall- or pedestal-mounted. Two
antennas mounted on the outside of the building
channeled wireless signals in either direction of
the intersection.
Within two hours of unpacking the ADC product,
the digital RF transport system was operational,
with a noticeable increase in the number of calls
being made. Digivance LRCS provided seven
times the RF output power of the system it
replaced. Therefore, two additional radios were
installed, providing 50 percent more capacity to
accommodate the increased traffic. Digivance

LRCS easily accommodated the increase in
capacity, with the flexibility to handle additional
radios should they be required later.
Benefits Realized by the Customer
The flexible architecture of Digivance LRCS
allows capacity and coverage to be distributed
precisely where needed. In this case, the new and
existing base station capacity was centralized at
the 12th story cell site, eliminating the capital
and operating costs associated with locating a
new cell site. Digivance LRCS provides increased
flexibility in configuring the existing capacity for
maximum utilization. The increased RF output
power of Digivance LRCS has already enabled
the service provider to expand the number of
base radios serving the area, but it can also
accommodate additional capacity should it be
needed later. Optimizing radio capacity will result
in increased profitability for the service provider.
Upon turn-up of ADC’s digital RF transport
system, the service provider’s received signal
strength and signal quality immediately improved.
Subscribers will be able to place more and
longer calls and experience fewer dropped calls,
increasing customer satisfaction and improving
quality of service. Since quality of service is
directly related to subscriber churn, the service
provider is likely to increase customer retention
and avoid the acquisition costs of replacing a
dissatisfied subscriber base, having a positive

impact on revenue and profitability.
Digivance LRCS is designed to be a very cost-
effective solution. The optional WDM module
allows the RF signal to be transported over a
single fiber cable, conserving a second valuable
fiber for another revenue-generating activity. In
addition, the digital RF transport platform enables
the transition to future capabilities such as dense
wavelength division multiplexing and free space
optics links.
The element management software in Digivance
LRCS simplifies operation and maintenance
of the system(s). The Digivance Element
Management System (EMS) provides operational
and maintenance capabilities for up to 15
Digivance LRCS links. Remote alarm monitoring
from the network operations center reduces
troubleshooting time. The Digivance EMS also
provides local alarm networking of multiple
systems for monitoring and control.
The modularity of the Digivance LRCS system
is another advantage. In the unlikely event of a
failure, the specific module requiring service can
be removed and a replacement module inserted.
In contrast, some other systems require the
entire unit to be dismounted from the wall and
sent back to the vendor for repair. Furthermore,
Digivance LRCS offers optional battery backup
in the case of a power failure – an important
feature since each minute of service can result in

additional revenue for the service provider.
ADC offers full installation support for Digivance
LRCS. Within just two hours of unpacking the
system, Digivance LRCS was transporting calls.
Comparatively, the service provider had to install
the existing analog system itself, and it reportedly
took weeks to become fully functional.