stion) Fig. 9.4 IoT and user mobility in LDM pairing M. S. Islam et al. The IoT device is assumed to move at a random angle to the (x2, t2) after time t. Then the final position can be calculated using (2 x x 1 + d cos(p), (9.18) y2 = yl + d sin(d). (9.19) The coordinates of BS and IoT are now known. The distance between the initial and final location of IoT and with BS can be measured using (9.15). At the final position, the angle between BS and IoT is taken as O2 as shown in Fig. 9.4 which can be calculated as (9.20) Similarly for user device, the final angle Of can be calculated using the following values of user's initial and final position. (9.21) Assume tp as the power transmitted from the BS with n p being the white noise power and h being the channel fading. Path loss Lp can be calculated as [20] p=32.4+20log10(fc)+20log10(r), (9.22) where fc is the carrier frequency in GHz and r is the distance between transmitter and receiver in meters. Then finally, we can calculate the SNR at IoT devices from (9.23) where h is the time selective fading coefficient. For L number of transmission paths, h depends on the career frequency fc and Doppler frequency fd. The following equation provides the relation between h and these above parameters as a function of time. (9.24) From this relation, we can calculate h from the carrier frequency fc and the speed of the devices, which is the cause of the Doppler frequency fd. We assume the SNR 9 Feasibility of LDM to Serve User-IoT Pairs in the Future Wireless Network of IoT at the initial position as P1 . IoT data is transmitted using the UL, and LDM configuration is developed based on P1 and user network conditions. As the IoT and user device moves from the initial position, the SNR condition will keep changing. The LDM pair needs to break when the minimum SNR required for the IoT devices or the user is greater than the channel SNR of either devices. 9.6.2 The Range of IoT Device's Initial Position When forming LDM pair, both user and IoT devices need to be within the coverag