HomeMy WebLinkAboutRS_RF Justification_180227_v1�r
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Network Engineering Verizon Wireless
3245 158mAve 5E
M!5 231
Bellevue, WA 98008
Retail Renton — Radio Frequency (RF) Documentation
Overview:
Verizon Wireless strives to provide excellent wireless service with a network of cell sites that allows our customers to
reliably place and receive mobile phone calls. In this particular case, we are trying to remedy capacity and coverage
challenges in Renton as quickly as possible. Specifically in the Central Renton area so that customers will receive better
service and faster data speeds.
Construction of the proposed site entails installing six (6) antennas, auxiliary equipment, and the supporting base station
equipment. This site will be in use until permanent sites in the surrounding area can be identified and constructed. In -
building penetration, coverage challenges, and continued growth in our customer base, and call traffic in this area has
dictated the need for the proposed site and the increasingly poor service in the area due to capacity restrictions has
prompted Verizon to install a temporary site which will be much faster than a permanent site to provide the best service as
soon as possible.
Capacity:
An additional function of some wireless sites, such as the subject Retail Renton site, is to provide additional capacity in an
area. The capacity of wireless networks is limited by the spectrum availability, the number of available antennas, and the
radios and amplifiers associated with those antennas and spectrum. When a mobile user attempts to make a call on a
wireless network where capacity is limited by these factors, the resulting delay and busy signal can be very frustrating. To
remedy capacity issues, additional sites and or spectrum, which are directly correlated to the number of antennas at the
site as outlined below, are added to an area to provide additional calling capacity for Verizon Wireless customers.
There are some Verizon Wireless sites in the immediate vicinity that are at or near capacity. To remedy
the reduced capacity, the subject site is being proposed so that calls at surrounding sites can be "off loaded" to the
proposed site and thus creating more wireless capacity for the vicinity. In order for this capacity off-loading to be
successful, precise placement of the new antennas is necessary. If the site is too far away, the signal will not have
adequate strength to capture calls from the impacted existing sites or cells. Similarly, sites that are too close together will
not provide the needed capacity relief to the existing sites. Thus for new sitelcell capacity solutions to work, site
placement and height are critical factors and must be chosen carefully.
Coverage:
In order to provide excellent Cellular service, which Verizon Wireless defines as —85 dBm or better, the antenna height
and site location need to provide a line of sight to the roads, offices, and homes where our customers work and reside. Six
(6) antennas are being proposed, in order to provide the necessary radio frequencies supporting all of Verizon Wireless
voice and data services that are possible to install in this temporary style site. The proposed antenna heights of is the
minimum height needed for the effective functioning of the proposed antennas as well as providing the adequate height
needed for the Microwave Dish that will provide backhaul for the site to connect it to the existing network. The antenna
sizes and the terrain and foliage in the vicinity make this the minimum height necessary to provide adequate levels of
coverage and usage offloading in the context of surrounding Verizon Wireless sites.
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Design
The Site Retail Renton will utilize our PCS 1900 MHz, 700 MHz, 800MHz, and 2100 MHz frequencies. It will basically be
four wireless facilities located in the same physical equipment area. For the site Retail Renton each frequency set will use
LTE 4G. The site has been designed with six (6) antennas. This is the minimum antenna requirement for this three sector
site to get the best possible service from each of our transmit frequencies and add the needed service coverage and
capacity to the area.
Propagation Maps:
There are several methods for determining where coverage gaps exist within a given network of wireless
sites. One of these is through the use of propagation maps. The propagation map is a computer
simulation of the strength of Verizon Wireless signals at a given height and location in the context of the
network. Propagation maps are one tool for determining whether a proposed site will meet the coverage
objective and what antenna height is needed to provide robust service for Verizon Wireless customers.
The radio propagation tool is designed to take factors such as terrain, tree coverage, and existing
buildings into account, so that it depicts a reliable estimate of coverage that would be provided by a
proposed site.
The propagation maps that follow show three levels of service, designated as the following colors:
Green >_ -85 dBm, a level of service adequate for providing reliable coverage inside a building
Yellow >_ -95 dBm, a level of service adequate for providing reliable coverage outdoors or
inside a car
White <_ -95 dBm, unreliable signal strength, may not be not capable of reliably making and holding a call
depending on environment
The proposed site will offload the existing sites to provide additional capacity in the Verizon Wireless network as well as
add needed coverage between two existing sites in our target service area.
Summary:
In summary, the proposed site would meet the RF coverage objective of the subject site. The height of the six (6) antenna
array is the minimum required for the effective functioning of the proposed minor communication utility.
Sincerely,
Krystal Taylor
Verizon Wireless