C users per cell, where small latency critical payloads of 50 bytes are spo- radically generated according to a Poisson process. As this scenario corresponds to a fully loaded network, the mobile broadband users are scheduled with a transmission time of 1 ms, using all the available resources. Hence, no radio resources are reserved for potentially incoming LLC traffic. Instead, preemptive scheduling is applied when- ever LLC payloads arrive. Those latency critical payloads are immediately scheduled on arrival with mini-slot resolution, overwriting part of the ongoing mobile broadband transmissions. Due to the urgency of the LLC traffic, we assume a block error rate of only 1% for such transmissions to avoid too many HARQ retransmissions. The average cell throughput is illustrated in Figure 10.54, where the performance is shown for cases with/without LLC traffic. For the cases with LLC traffic, the offered load is such that approximately 12% of radio resources is used for LLC. Two sets of results are shown for the case with LLC traffic: one where the full transport block is retransmitted for failed mobile broadband HARQ transmissions, and one where only the damaged part of the mobile broadband transmission that has been subject to preemption is retransmitted, 10 5G Performance Average aggregated cell capacity [Mbps] eMBB only Partial retransmission retransmission Figure 10.54 Average cell capacity for cases with LLC/eMBB and preemptive scheduling. labeled as partial retransmission in Figure 10.54. The latter option is the most promis- ing solution, as fewer radio resources for HARQ retransmissions of mobile broadband transmissions that have suffered from puncturing are used. However, the cost of using this approach is a slightly larger latency for the mobile broadband users, as the prob- ability of triggering a second HARQ retransmission is higher, as compared to the case where the first HARQ retransmission includes the full transport block. Figure 10.55 shows the complementary cumulative distribution function of 