IEEE - Aerospace and Electronic Systems - October 2019 - 46

Satellite-Based Capillary 5G-mMTC Networks for Environmental Applications

Figure 6.
Block probability versus number of active cabinets in the considered region for CSAT ¼ 1 Gb/s and pCOV ¼ 25%, 50%.

Figure 4.
Region of central Italy.

constant bit rate (CBR) sources even including periodic
sources with given duty cycle. Examples of CBR traffic
include (low bit rate) cameras and environmental audio.
Performance in terms of Pblock have been evaluated as a
function of the aggregate CBR traffic (only) produced by
sources connected to the single RS. Random traffic originating from event-type-based communications of sensors
with the server are assumed to generate temporary/sporadic
fluctuations of the bit rate characterizing the CBR traffic
that do not significantly affect the considered performance
parameters.
In Figure 5, we plot the US coverage of the aggregate
bit rate at the cabinet. Results have been obtained using

Figure 5.
Upstream bit rate FttC coverage for central Italy.

46

data from FttC network of Italy and account for about
30 000 cabinets. On average, each cabinet owns about ten
distributors and the 10th and 90th percentiles of their distances from the cabinet are 94 and 729 m with a median
value of 271 m (i.e., the FttC network in Italy can be considered short).
As shown in Figure 5, an aggregate bit rate for US
transmissions of about 100 Mb/s (nonvectoring) or
150 Mb/s (vectoring) are available at the cabinet for transmission of data from sensors with probability of 90%.
Higher bit rate values even in the order of Gb/s can be
achieved with probability of 20% (vectoring) provided
distributors are close to the cabinet.
Indicating with CSAT , the available transmission
capacity provided by satellite in a beam-spot, the blocking
probability is defined as
Pblock ¼ ProbfRb;Tot > CSAT g

(3)

where Rb;Tot is the aggregate bit rate at the satellite due to
the active cabinets transmitting at the satellite.
In Figure 6, we report Pblock as a function of the
number of cabinets simultaneously active in the considered area for a satellite capacity CSAT ¼ 1 Gb/s. The
maximum aggregate bit rate of the CBR sources RsMAX
connected to the single RS ranges from 512 kb/s to
4.096 Mb/s. Furthermore, we have assumed that only a
percentage pCOV of the RSs connected to distributors
belonging to the same cabinet can be simultaneously
active. In other words, we assume that active RSs cover
pCOV ¼ 25% (solid lines) or pCOV ¼ 50% (dashed lines)
of the area. From results in Figure 6, Pblock increases
with RsMAX and with pCOV and curves are quite sharp
with the number of active cabinets.
In Figure 7, we report the number of simultaneous active
cabinet that can be supported by the system as a function of
IEEE A&E SYSTEMS MAGAZINE

OCTOBER 2019



IEEE - Aerospace and Electronic Systems - October 2019

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