Fig. 10
From: CMBF-based dynamic selection for heterogeneous massive MIMO systems
EE with respect to NBS for different coordination schemes NCBS ∈ {0, 1, 2}, R ∈ {1, 2, 3}, and NS = 4. ------ represents the achievable rate constraints of 3 bit/s/Hz. — represents the achievable rate constraints of 2 bit/s/Hz. …… represents the achievable rate constraints of 1 bit/s/Hz. о represents there is only macro base station and the number of small base station NCBS = 0. □ represents the number of small base station NCBS = 1. ☆ represents the number of small base station NCBS = 2