单项选择题
A. Space for antennas
B. Frequency allocation
C. Electrical power availability
D. Permission/Contract with owner
E. Availability of PCM link to the BSC
单项选择题 A subscriber makes a two-minute call and a four-minute call during the busy hour. How much traffic does he generate for that hour? （）
单项选择题 Reusing frequencies in a cellular pattern (compared to “one big cell”)（）
单项选择题 Which cell pattern is recommended to use when using frequency hopping? （）