1. How is the antenna gain obtained?

2. If DTX technology is used, the phone does not need to transmit anything during the interval of voice.

3. Which of the following radio wave bands does the frequency band currently used by the GSM system belong to?

4. In the mobile communication system, the diffraction capability and penetration capability of the 900M signal are better than the 1800M signal.

5. The power of a 10W power signal after going through an attenuator (the loss is 6dB) is:

6. The location area is a subset of the routing area, and one or more location areas form a routing area.

7. E-GSM frequency band means:

8. According to the GSM specification, if the receiving sensitivity of the base station is -110 dBm, the maximum value of the first adjacent channel interference level of the carrier frequency is to ensure normal operation:

9. Slow fading rate is mainly determined by: _______________

10. GSM frequency hopping mode can be divided into frame hopping and slot hopping according to time domain. Frame hopping means that each hopping frequency point is changed once every TDMA frame period, and slot hopping means that slot frequency point of TDMA frame changes once.

11. GSM uses ___ multiple access multiplexing.

12. GSM 2.5 generation communication system is:

13. The 1800M GSM bandwidth allocated by the country to China Unicom is:

14. GSM base station subsystem includes:

15. A frequency point bandwidth of GSM is:

16. Mobile phone first access to mobile communication network through ___ device.

17. What kind of channel is the abbreviation of BCCH?

18. CDMA and GSM communication systems belong to cellular mobile communication systems, and which one also belongs to cellular mobile communication systems?

19. How does the signal travel between the phone and the antenna?

20. The 3G standard of China's independent research and development is: