Page 85 - ITU Journal Future and evolving technologies Volume 2 (2021), Issue 6 – Wireless communication systems in beyond 5G era

ITU Journal on Future and Evolving Technologies, Volume 2 (2021), Issue 6

×10 4 ×10 4 ×10 4
2 2.5
1.8 MMM MMM 3 MMM
1.6 2.5 4
GI-LARE 2 GI-LARE GI-LARE ×10
1.4 Static 1.5 Static 9000 2 Static 1.4
Total Utility of the Network 0.8 1 6500 Total Utility of the Network 1 8000 Total Utility of the Network 1.5 1 1.2
1.2
1.3
1.1
6000
0.6
7000
5500
0.4
5000
0.5 6000 0.9 1
5000
4500 0.5 0.8
4 4.5 5 4 5 6 4 5 6
5 10 15 5 10 15 5 10 15
Slice User Average Arrival Rate Slice User Average Arrival Rate Slice User Average Arrival Rate
(a) With a small cell density of 2 (b) With a small cell density of 3 (c) With a small cell density of 4
Fig. 8 – Impact of the slice user density on the network utility.

×10 4 15000
4 3 15000
Total Network Utility 2 1 Total Network Utility 10000 Total Network Utility 10000
5000
5000
0 0 0
15 10 10
4 8 4 8 4
10
6 6
5 3 Slice User Avg. Arrival Rate 4 3 Slice User Avg. Arrival Rate 4 3
0 2 No. of Small Cells 2 2 No. of Small Cells 2 2 No. of Small Cells
Slice User Avg. Arrival Rate
(a) Multi‑Domain Multi‑Tenant Multi‑Slice Alg. (b) GI‑Lare Alg. (c) Static Resource Alloc.
Fig. 9 – Impact of the slice user density on the network utility.

9.4 Impact of the picocell density 9.5 Impact of the access point coverage radius
In Fig. 13(a), Fig. 13(b), Fig. 13(c), and Fig. 13(d), we take
Fig. 12(a) and Fig. 12(b) show the effect of the picocell
a close‑up view of the performance of M‑TTSD in a 2‑
density with network bandwidth size, delay bound, slice
domain and 3‑domain network deployment as the cover‑
user intensity, and a packet loss probability of 400MHz, age radius of the femtocells and picocells vary taking into
100ms, 3, and 10 −5 on the performance of the M‑TTSD
consideration their peculiarities.
network. It is observed that as the picocell density in‑
Fig. 13(a) and Fig. 13(b) present the impact of the cov‑
creases, the network utility of the SPs increases. More‑
erage radius of the femtocells on the network utility in a
over, we observe that the network utility in the 3‑domain
2‑domain and 3‑domain network for SP1 and SP2. With
network deployment outperforms the 2‑domain network
an assumed network domain bandwidth size of 400MHz,
for the 2 SPs, respectively, in Fig. 12(a) and Fig. 12(b).
we vary the cell radius from 10m to 100m. To this end, we
However, comparing Fig. 11(a), Fig. 11(b), Fig. 12(a), and
observe that the network utility dips as the cell radius in‑
Fig. 12(b), we observe that the network utility for fem‑
creases in the 2‑domain network and 3‑domain network
tocell densi ication outperforms that of the picocell den‑
for the SP1 and SP2, respectively. Consequently, the result
si ication owing to the higher interference levels that ac‑
is due to the effect of pathloss and channel condition. Sim‑
company cells with higher powers, in this case, picocells.
ilarly, we examine the impact of the picocell coverage ra‑
Additionally, the femtocells are much more closer to the dius on the network utility; with a varied cell radius from
slice users.
200m to 450m in Fig. 13(c), and Fig. 13(d). We observe
the network utility for both SPs reduces as the coverage
radius increases.

© International Telecommunication Union, 2021 73