30 Questions
What is the main issue that necessitates the use of multiple access schemes in UMTS?
Interference among different senders and receivers
Which multiple access scheme assigns a separate frequency channel to each mobile for the duration of the call?
Frequency Division Multiple Access (FDMA)
What is the primary challenge addressed by Frequency Division Multiple Access (FDMA)?
Preventing adjacent channel interference
In 2G, which multiple access scheme is characterized by the division of time into timeslots?
Time Division Multiple Access (TDMA)
What is the key concern addressed by Code Division Multiple Access (CDMA) in UMTS?
Interference reduction
Why is frequency considered a precious and scarce resource in the context of UMTS?
Running out of available frequencies
In UMTS, which QoS class is characterized by low delay and low delay variation with basic QoS requirements for speech and using AMR speech coding?
Conversational
Which QoS class in UMTS is associated with reasonably low delay and delay variation, with stringent BER requirements and traffic management important for variable bit rate in the radio network?
Streaming
What is the main characteristic of the background QoS class in UMTS?
Delay is not critical
Which UMTS QoS class is associated with low round-trip delay and delay variation not being important, with stringent BER requirements for non-real-time connections?
Interactive
What is the characteristic of the conversational UMTS QoS class in terms of bit rate for speech using AMR coding?
Variable bit rate
In UMTS, which protocol stack is used for the transport of user data in the circuit switched domain?
SS7 based
Which access technology does 2G use?
TDMA (Time Division Multiple Access)
What is the typical data rate range for 3G wireless networks?
9.6 Kbps to 2 Mbps
Which technology is introduced in the evolution from 2G to 2.5G, offering increased data rates and compatibility with GSM?
EDGE (Enhanced Data rates for GSM Evolution)
What does CDMA (Code Division Multiple Access) initially developed for?
Military use
Which network technology architecture includes elements like BSS (Base Station System), NSS (Network Sub-System), and AuC (Authentication Center)?
GSM (Global System for Mobile communication)
What does TD-SCDMA (Time division synchronous CDMA) have that makes it suitable for asymmetrical traffic?
Single spectral band
Which technology offers data rates of 144 kbps for rural areas?
3G
Which network architecture includes Core Network (CN), UMTS Terrestrial Radio Access Network (UTRAN), and User Equipment (UE)?
UMTS
Which technology uses wide band CDMA technology for its air interface?
UMTS
Which service is specific to 3G?
Video sharing
Which network architecture includes changes in the core network, upgrading SGSN to 3G SGSN, and MSC to 3G MSC?
3GPP
Which technology is used for the transition from IS-95, GSM, and GPRS to W-CDMA, EDGE, and Cdma2000-1xEV,DV,DO?
UMTS
What functions does the RNC (Radio Network Controller) perform in a UMTS network?
Radio resource control, channel allocation, power control, handover control, ciphering, and segmentation
In which frequency bands does UMTS operate for 3G transmission?
1900-2025 MHz and 2110-2200 MHz
What did UMTS Rel.4 introduce to the network architecture?
Soft switching and tandem free operation
What feature was introduced by 3GPP Rel.5 with regards to data transmission speed?
HSDPA with speeds up to 10 Mbps
What distinguishes UMTS handover technique from GSM's handover technique?
UMTS uses a soft handover technique, unlike GSM's hard handover
What is the UMTS bearer service architecture composed of?
UTRAN, CN, Iu edge node, UE, CN gateway, and core network
Study Notes
Functions and Architecture of 3G UMTS Network
- Node-B handles air interface Tx/Rx modulation/demodulation
- RNC functions include radio resource control, channel allocation, power control, handover control, ciphering, and segmentation
- UMTS operates in the 1900-2025 MHz and 2110-2200 MHz bands for 3G transmission
- UMTS Rel.4 introduced soft switching and tandem free operation
- 3GPP Rel.5 brought HSDPA with speeds up to 10 Mbps and guaranteed end-to-end QoS
- UMTS uses a soft handover technique, unlike GSM's hard handover
- The UMTS bearer service architecture includes UTRAN, CN, Iu edge node, UE, CN gateway, and core network
- Bearer refers to a capability with defined capacity, delay, and bit error rate
- 3GPP Rel.4 network architecture includes UTRAN and Circuit Switched (CS) core network
- Release 4 introduced features like IPv6 support, SIP replacing SS7, and multimedia message service environment
- 3GPP Rel.5 network architecture included IMS, high-speed downlink packet access (HSDPA), and interworking with the PSTN
- UMTS supports session initiated protocol (SIP), multimedia messaging service (MMS), and global text telephony
Test your knowledge of the functions and architecture of 3G UMTS networks with this quiz. Explore topics such as Node-B, RNC, frequency bands, soft handover, bearer services, network architecture, and key features introduced in 3GPP releases.
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