In cellular mobile networks, select possible answer(s)
Group of answer choices
A. 2G cellular networks were primarily built on circuit switching, while modern networks like LTE- A and 5G are built using IP networks
B. Interference from other cells is the main problem in planning cellular networks
C. Cells are usually divided into 3 or 6 sectors to increase the capacity
D. Cells are usually perfectly hexagonal in real network implementations
