IEEE - Aerospace and Electronic Systems - May 2023 - 52

Intelligent Spectrum Management for Future Aeronautical Communications
Figure 3.
Resource management diagram.
communications (e.g., command and control) between each
AV and its connected base station (BS) with the guaranteed
minimum QoS, measured by the signal to interference plus
noise power ratio (SINR); 2) collision avoidance enforced by
each AV. To this end, we formulate a travel time minimization
problem that jointly optimizes the AVs' moving velocities
and channel allocations. Let Tn denote the travel time of
AVn, the optimization problem is formulated as follows:
P1: min
V;A
s.t.
X
k2K
au
X
n2N
gu
To ensure connectivity and fairness, Constraint (1a)
requires that each AV is allocated one and only one
channel at any time, where au
n;kðtÞ and ad
at time t for uplink; otherwise, au
nðtÞ and gd
n;kðtÞ are channel
allocation indicators for uplink and downlink, respectively
(i.e., au
n;kðtÞ¼ 1 if channel k is allocated to AV n
n;kðtÞ¼ 0Þ. Constraint
(1c) guarantees the minimum QoS for communications,
where gu
nðtÞ are AV n's SINR for uplink and
Tn
n;kðtÞ¼ 1;
nðtÞ gu
X
k2K
ad
min; gd
(1aÞ
n;kðtÞ¼ 1 8n 2 N; t 2 T (1bÞ
nðtÞ gd
min
dn;mðtÞ dmin 8n;m 2 N;n 6¼ m:
8n 2 N; t 2 T (1cÞ
(1d)
downlink, respectively. Note that the SINR is jointly
determined by the channel allocation in (1b) and the
channel gains associated with the desired and interfering
signals. At flying altitudes, these channel gains are dominated
by the distance of the line-of-sight paths between
the transmitters and receivers, which are constantly
changing as functions of the velocities of all AVs. Constraint
(1d) enforces collision avoidance, where the distance
between any two AVs, dn;mðtÞ, must be greater
Figure 4.
Air-ground communications in AAM.
52
IEEE A&E SYSTEMS MAGAZINE
MAY 2023

IEEE - Aerospace and Electronic Systems - May 2023

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