Study on the User Density Identification via Improved Whale Optimization Algorithm in Device-to-Device Communication

Figure 6

Distribution of D2D users in different areas. (a) Area 1, N = 10. (b) Area 2, N = 20. (c) Area 3, N = 40. (d) Area 4, N = 80.

(a)

(b)

(c)

(d)