Page 222 - From GMS to LTE

208 From GSM to LTE-Advanced Pro and 5G

5. Why is a scrambling code used in addition to the spreading code?

6. What does ‘cell breathing’ mean?

7. What are the differences between the Cell‐DCH and the Cell‐FACH RRC states?

8. In which RRC states can a mobile device be in PMM connected mode?

9. How is a UMTS soft handover performed and what are its advantages and
disadvantages?

10. What is an SRNS relocation?

11. How is the mobility of a user managed in Cell‐FACH state?

12. What is the compressed mode used for?

13. What are the basic HSDPA concepts for increasing the user datarate?

14. How is a circuit‐switched voice connection handled during an ongoing HSDPA
session?

15. What are the advantages of the E‐DCH concept?

16. Which options does the Node‐B have for scheduling the uplink traffic of different
E‐DCH mobile devices in a cell?

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

References

1 3GPP Release Descriptions, 3GPP, Release Descriptions, http://www.3gpp.org/ftp/
Information/WORK_PLAN/Description_Releases/, Accessed in 2016.
2 3GPP, Radio Resource Control (RRC) Protocol Specification, TS 25.331.
3 ETSI TS 102 900, Emergency Communications (EMTEL); European Public Warning
System (EU‐ALERT) using the Cell Broadcast Service, http://www.etsi.org/deliver/
etsi_ts/102900_102999/102900/01.01.01_60/ts_102900v010101p.pdf, Accessed in 2017.
4 3GPP, Physical Channels and Mapping of Transport Channels onto Physical Channels
(FDD), TS 25.211.
5 M. Degermar et al., IP Header Compression, Internet Engineering Task Force, RFC
2507, February 1999.
6 3GPP, UTRAN Iur and Iub Interface User Plane Protocols for DCH Data Streams, TS 25.427.
7 3GPP, UTRAN Iu Interface Radio Access Network Application Part (RANAP) Signaling,
TS 25.413.