Page 83 - From GMS to LTE

Global System for Mobile Communications (GSM) 69

Questions

1. Which algorithm is used to digitize a voice signal for transmission in a digital
circuit‐switched network and at which datarate is the voice signal transmitted?

2. Name the most important components of the GSM NSS and their tasks.

3. Name the most important components of the GSM radio network (BSS) and their tasks.

4. How is a BTS able to communicate with several subscribers at the same time?

5. Which steps are necessary to digitize a speech signal in a mobile device before it
can be sent over the GSM air interface?

6. What is a handover and which network components are involved?

7. How is the current location of a subscriber determined for a mobile‐terminated
call and how is the call forwarded through the network?

8. How is a subscriber authenticated in the GSM network? Why is an authentication
necessary?

9. How is an SMS message exchanged between two subscribers?

10. Which tasks are performed by the RISC processor and which tasks are performed
by the DSP in a mobile device?

11. How is data stored on the SIM card?

12. What is CAMEL and for which service is it typically used?

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

References

1 European Technical Standards Institute (ETSI), http://www.etsi.org.
2 The 3rd Generation Partnership Project, http://www.3gpp.org.
3 3GPP, Mobile Application Part (MAP) Specification, TS 29.002.
4 3GPP, Bearer‐Independent Circuit‐Switched Core Network – Stage 2, TS 23.205.
5 3GPP, Media Gateway Controller (MGC) – Media Gateway (MGW) Interface – Stage 3,
TS 29.232.
6 ITU, H.248: Gateway Control Protocol, http://www.itu.int/rec/T‐REC‐H.248/.
7 ITU, Q.1901: Bearer Independent Call Control Protocol, http://www.itu.int/
rec/T‐REC‐Q.1901.