Fig. 8From: CMBF-based dynamic selection for heterogeneous massive MIMO systemsEE with respect to NBS for different coordination schemes. ◇ represents there is only macro base station that the number of small base station NCBS = 0. о represents the number of small base station NCBS = 1. + represents the number of small base station NCBS = 2. * represents the number of small base station NCBS = 3. ☆ represents the number of small base station NCBS = 4. ◁ represents the number of small base station NCBS = 5Back to article page