Which of the following phenomena does not exist in the analog network, but only in the digital wireless network?

• A. Congestion
• B. Fast decline
• C. Rayleigh decline
• D. Intersymbol interference

The wireless signal propagates on the water surface more than the loss of ___ in the air. The higher the frequency of the wireless signal, the more ___ the loss of propagation in the air.

• A. Small, small
• B. Big, small
• C. Big, big
• D. Small, big

Unicom's GSM dual-frequency network refers to:

• A. 900MHz and 1900MHz
• B. 800MHz and 1800MHz
• C. 900MHz and 1800MHz
• D. 800MHz and 1900MHz

Increasing the same inter-page frame number coding can improve paging overload.

• A. True
• B. False

Which of the following statements about network color code are correct? (Multiple choice)

• A. It must be ensured that adjacent or neighboring cells using the same BCCH carrier frequency have different BSICs. Therefore, we must pay special attention to the configuration of the communities at the junctions of provinces and cities.
• B. BCC values can range from 1 to 7.
• C. Generally, GSM PLMNs in neighboring countries choose different NCCs, so it is only necessary to negotiate BCC when planning domestic provinces and cities.
• D. The NCC and the BCC together form a Base Station Identity Code (BSIC), which is transmitted on the synchronization channel (SCH) of each cell.