From GSM to LTE: An Introduction to Mobile Networks and Mobile Broadband

2.13 Questions

1. What are the differences between circuit-switched and packet-switched data transmission?

2. What are the advantages of the data transmission over GPRS compared to GSM?

3. Why are different modulation and coding schemes used?

4. What is the difference between the GPRS ready state and the GPRS standby state?

5. Does the GPRS network perform a handover if a cell change is required while data is transferred?

6. Which are the new network elements that have been introduced with GPRS and what are their responsibilities?

7. What is a temporary block flow?

8. What actions are performed during an inter-SGSN routing area update (IRAU)?

9. Why is IP used twice in the protocol stack of the Gn interface?

10. Why is it not necessary to change any settings on the mobile device for GPRS when roaming abroad?

11. What is the difference between a GPRS attach and a PDP context activation?

12. Why is an Access Point Name (APN) necessary for the PDP context activation procedure?

13. How are MMS messages sent and received via GPRS?

14. Name the different parts of an MMS message.

Answers to these questions can be found on the companion website for this book at http://www.wirelessmoves.com.

References

[1] 3GPP, ‘Multiplexing and Multiple Access on the Radio Path’, TS 45.002, Annex B1.

[2] 3GPP, ‘Radio Access Network: Channel Coding’, TS 45.003.

[3] Y.-K. Chen and Y.-B. Lin, ‘IP Connectivity for Gateway GPRS Support Node’, IEEE Wireless Communications Magazine, 12, 37–46, February 2005. ...