hes are not valid. UTD-PO is used to resolve issues related to the scattering of radio waves in the shadow region of the obstacles. This field is computed uniformly in the shadow region without any discontinuities in the prediction of the field. A ray diffraction model is used to determine the diffraction coefficient of a knife edge for each diffracting wave. These diffraction coefficients determine the received field strength and the phase factor of the propagating wave after diffraction from the roof top of the knife edge obstacle. The total solution is obtained by adding these received fields with their corresponding incident and reflected fields. By applying the above approaches, we calculate the total received field at the receiver R a wave arrived by passing through a series of obstacles or a hill of N- dimensions (face). This series of obstacles is approximated as knife edge obstacles of arbitrary height and spacing. When the 0th-face and the nth-face of an obstacle or a hill are equal, a single half-screen or a knife edge is used to depict the obstacle as shown in Figures 6.2, 6.3, 6.4, 6.5 6.6 and 6.7. 5G Wireless Communication System in Healthcare Informatics (LOS) ========= WS=W2 (NLOS) 0-face (0-face = n-face) n-face FIGURE 6.2 The height of the transmitter is below the height of the obstacle, and the receiver moves from NLOS to LOS. For the calculation of the received field, we considered a spherical radio wave that impinges on the knife edge obstacle such that the incident field E is given by (6.1) Where E is the field transmitted from the transmitter T and its value is unity. R o is the radial distance between the transmitter T and the knife edge obstacle as shown in Figures 6.2, 6.3 and 6.4. Categorization of an irregular terrain scenario based on relative knife edge obstacle height hobt, with respect to the height of the transmitting point hix and the receiving point h rx Case 1: When the transmitter T of height hix is below the height of obstacle hobt. and the receiving point R of height hw is m