IEEE - Aerospace and Electronic Systems - April 2023 - 10
Laser Intersatellite Link Range in Free-Space Optical Satellite Networks: Impact on Latency
Table 4.
LISL Range Versus Average Network Latency (i.e., dtotal) for the Three Intercontinental Connections
Intercontinental connection
LISL
range
(km)
nhop
659.5
1319
1500
1700
2500
5016
dprop
(ms)
New York-London
dnode
(ms)
5.00 21.65 5.00
4.99 21.63 4.99
4.17 21.68 4.17
3.03 21.58 3.03
2.00 21.33 2.00
dtotal
(ms)
nhop
New York-Istanbul
dprop
(ms)
dnode
(ms)
dtotal
(ms)
nhop
New York-Sydney
dprop
(ms)
dnode
(ms)
dtotal
(ms)
10.35 23.49 10.35 33.84 14.91 33.19 14.91 48.10 28.83 63.46 28.83 92.29
26.65 7.00 30.99 7.00
26.63 7.00 30.89 7.00
25.86 6.00 30.93 6.00
24.61 4.83 30.76 4.83
23.33 3.00 30.45 3.00
and hops in the first shortest path for this scenario reduce to
five and six, respectively, as apparent from Figure 3.Furthermore,
dtotal reduces to 33.45 ms, nhop reduces to three,
and the number of LISLs and hops in the first shortest path
reduce to two and three, respectively, at 5016 km LISL
range as evident from Table 4 and Figure 4. Lesser number
of LISLs and hops in shortest paths at higher LISL ranges
translate into lower propagation and node delays and lower
average network latency.
The improvement in average latency with increase in
LISL range is observed in all scenarios from Table 4 and
Figure 5. For example, the average latency improves from
33.84 to 23.33 ms, 48.10 to 33.45 ms, and 92.29 to 63.55 ms
for New York-London, New York-Istanbul, and New
37.99 14.13 60.57 14.13 74.70
37.89 13.71 60.03 13.71 73.75
36.93 12.97 59.98 12.97 72.95
35.59 8.48 59.85 8.48
33.45 5.00 58.55 5.00
68.32
63.55
York-Sydney intercontinental connections, respectively, as
the LISL range increases from its minimum possible value
to its maximum, i.e., from 659.5 to 5016 km.
At 659.5 km LISL range, a shortest path could not be
found at seven time slots for New York-London, seven time
slots for New York-Istanbul, and 1262 time slots for New
York-Sydney intercontinental connection out of a total of
3600 time slots. The network connectivity at this LISL range
is low and is not sufficient to ensure a shortest path at all time
slots, which makes it an unfeasible LISL range for this
FSOSN. This also illustrates the need for analyzing the
shortest path availablity over an FSOSN for a sepecific LISL
range over time. For an LISL range to be feasible, it has to
be provide shortest paths 100% ofthe time.
Figure 3.
First shortest path between New York and Istanbul over the FSOSN at 1700 km LISL range. Note that the higher 1700 km LISL range leads
to longer LISLs and six hops on this path. The propagation delay, node delay, and the latency of this path are 31.03, 6, and 37.03 ms,
respectively.
10
IEEE A&E SYSTEMS MAGAZINE
APRIL 2023
IEEE - Aerospace and Electronic Systems - April 2023
Table of Contents for the Digital Edition of IEEE - Aerospace and Electronic Systems - April 2023
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