2) (30 pts) Suppose that a mobile user is moving along a straight line from identical base stations BS: to BS, as shown in Figure below. Distance between the base stations is D = 1800m. For simplicity, assume small scale fading is neglected and the received power (in dBm) at the base station i, from the mobile station, is modeled as a function of distance on the reverse link Prildi) = Po 10nlog10(di/do) (dBm) i = 1,2 where di is the distance between mobile and the base station i, in meters. Po is the received power at distance do from the mobile antenna. Assume Po = 0 dBm and do = 1m. Let n denote the path loss where path loss exponent is considered to be 3. Assume that required time to complete a handoff is 10 seconds once the received signal level reaches to handoff threshold and the required margin value in terms of the difference of received power from BS. to BS is specified as 4= 9 dBm. Note that A= Pro - Primin where Pr.ho is the threshold level used to start switching for handoff initiation and minimum usable signal level for acceptable quality at the base station receiver is Pr,min- Consider that the moving mobile station is observed at distance d from BS2, where handoff is initialized and at the same time, the minimum usable signal level for acceptable quality is observed at BS2 for the given distance D-d from the mobile station. BS1 BS2 D-1800m d Dd a) (20 pts) Considering the required margin value given above, find the distance between the mobile station and Bs, when the handoff was initialized. b) (10 pts) Determine whether the call is terminated or not if the speed of the mobile is 50 m/sec