Elimination of wireless service blind spot by co-operation between mobile terminals

In recent years, wireless communication technology becomes popular. To accommodate thousands of users, frequency bands utilized in the system tends to become high. When the high frequency band is utilized in wireless communication system, blind spots are occurred in downtown due to shadowing by buildings. In this paper, two co-operation schemes between the mobile terminals are proposed for eliminating the blind spots. One is “high power selection scheme” and another is “combine scheme”. Effectiveness of proposed co-operation schemes is shown by numerical results. It is shown that the percentage of blind spots can be reduced less than 5% if the height of base station is over 80m and more than 16 relay terminals are in the downtown area.