Question

1. What are the differences between mobile communication and mobile computing?
2. Compare between 2G, 3G, and 4G mobile networks.
3. Compare between TDMA, FDMA, and CDMA networks.
4. Draw and explain the GSM block diagram.
5. What is a GPRS network? What are advantages of SGSN and GGSN?

Answer 1

1. What are the differences between mobile communication and mobile computing?

Both mobile communication and mobile computing involve wireless data transfer. The difference is in the kind of data being transferred, and the kind of service being provided.

Mobile communication implies voice communication.

Mobile computing involves data transfer.

Voice communication has been happening way before the start of data transfer, i.e. Mobile communication is in existence way before mobile computing came into.

2. Compare between 2G, 3G, and 4G mobile networks.

The basic and the most important difference in between 2G, 3G and 4G mobile networks is the speed that these networks are providing. The 'G' in these names stand for generation. They refer to the 2nd, 3rd an 4th generation of wireless technology. Newer genration are faster than the older generation.

2G delivers up to 250Kbps speed.

3G delivers up to 3Mbps speed.

4G delivers up to 100Mbps speed for mobile access and up to 1Gbps speed for wireless access.

3. Compare between TDMA, FDMA, and CDMA networks.

TDMA is Time Division Multiple Access. When there are multiple station trying to use the channel, the time is divided into slots and each station has its time slot to transmit the data.

FDMA is Frequency Division Multiple Access. The bandwidth is divided into various frequency bands. Each station is allocated with a band to send data and only that station uses that band to send data.

CDMA is Code Division Multiple Access. In CDMA each station is assigned with a unique code sequence. All the stations can transmit the data any time they want. Using the Code sequence alloted to the stations the distribution is achieved.

4. Draw and explain the GSM block diagram.

The GSM mainly consist of User Equipment, Base transceiver station, Mobile switching center. The GSM contains almost all the necessary capabilities to suppport packet transmission over GSM.