Which of the following requirements should Base station site design generally meet? (Multiple choice)
A . In the case where the base station does not affect the layout of the floor try to select an existing post office telecommunications station to do site, to take advantage of its machine room facilities like power transmission tower;
B . Pointing the main lobe direction of the antenna to the high traffic density area can enhance the signal strength of the area, thereby improving the call quality;
C . The high-altitude mountain in the suburb is generally considered as the site;
D . For the location of roads and mountainous areas, make full use of topographical features, such as open roads and other places.
Answer: A B D