, 118, and 92, respectively. These results show that the proposed Num-AC QoS-AC Number of UEs Figure 9.3 Comparisons of the number of admissible UEs with different UE density. (The number of NSs is 20, and the number of BSs is 21.) 9 Access Control and Handoff Policy Design for RAN Slicing Num-AC QoS-AC Number of NSs Figure 9.4 Comparisons of the number of admissible UEs VS. number of NSs. (The number of UEs 200, and the number of BSs 21.) Num-AC policy can serve 47% and 88% more UEs when compared with NSA and BSA respectively. In the second experiment, we evaluate the number of admissible UEs of the four AC policies for varying number of NSs while using fixed number of UEs 200. Figure 9.4 shows the number of admissible UEs for the four policies as a function of the number of NSs. From Figure 9.4, we can see that the number of admissible UEs of all four policies increases with the number of NSs. This is because the more the number of NSs deployed the more the association choices for UEs, and thus the more UEs can be admitted. Specifically, the number of admissible UEs of QoS-AC, NSA, and BSA increases rapidly under the low NS density, and when the number of NSs is larger than 25, the number of admissible UEs of all the four policies increases slowly due to the limited bandwidth resource. We also find that the number of admissible UEs of Num-AC and QoS-AC is always significantly higher than that of NSA and BSA under all NS density circumstances. We next examine the relationship between the number of admissible UEs and the num- ber of BSs with the same parameters as those in the first experiment, and fix the number of UEs to 200. Figure 9.5 shows the number of admissible UEs for the four policies as a function of the number of BSs. From this figure, we can see that the number of admissible UEs of Num-AC, QoS-AC, and NSA monotonically increases with the number of BSs while that of BSA decreases, which is due to the decreasing number of NSs deployed in each BS. Moreover, the number of admissible UEs of Num-AC and QoS