General UMTS Flashcards
What does UMTS stand for?
Universal Mobile Telecommunications Service
How many Primary Scrambling Codes are available in UMTS?
512
What is a Primary Scrambling Code used to identify?
Separate tower sectors
Which network component controls multiple Node Bs?
Radio Network Controller (RNC)
Which network component allocates P-TMSIs?
Serving GPRS Support Node
The Packet-Switched UMTS network is broken into geographic regions called what?
Routing Area
What is the channel spacing in MHz used in UMTS?
5Mhz
What is the chipping rate of a UMTS channel?
3.84Mcps
What 2G technology is the foundation of UMTS?
GSM
How often does Closed Inner Loop power control happen?
Up to 1500 times a second
What is the step size in UMTS?
25 is the optimal step size
What is the geographic region controlled by an MSC?
LA
What multiple access scheme does UMTS use?
CDMA
What identifier uniquely identifies the Mobile Equipment?
International Mobile Equipment Identity (IMEI)
What identifies the make and model of a phone?
TAC
What identifier uniquely identifies a user’s subscription?
IMSI
What is the first release of UMTS called?
Release 99
What is the channel offset between uplink and downlink for band class 2?
80 MHz or 400 channels
What is the channel offset between uplink and downlink for band class 4?
400 MHz or 225 channels
What frequency band is band class 2?
1900
What frequency band is band class 4?
1700 AWS
What frequency band is band class 5?
850
What four components make the Global Cell ID?
MCC, MNC, LAC and CID
What physical channel is broadcast with OVSF code 0?
Common Pilot Channel (CPICH)
What is a LAI comprised of?
PLMN and LAC
What was the last version of UMTS?
Rel 7, HSPA+
Which network component translates disparate protocols?
Media Gateway (MGW)
What is the equation for suitability for FDD networks?
Squal = Qqualmeas – Qqualmin
What is the equation for suitability for TDD networks?
Srxlev = Qrxlevmeas – Qrxlevmin
What are the 3 types of neighbors?
Intra-frequency
Inter-frequency
Inter-RAT
What is the formula for the ranking criteria of the serving cell?
R = Qmeas – Qhyst
What is the formula for the ranking criteria of the neighbor cells?
R = Qmeas – Qoffset
What is the Ec/No?
Ratio between actual energy and spectral noise
Value of 0 to -24
What is Qmeas?
The measured Ec/No or RSCP of either the serving cell or neighbor cell
What is Qhyst?
The value applied to the serving cell to dissuade UEs from moving
What is Qoffset?
The value applied to neighbor cells. Can be a positive value to dissuade reselection or a negative value to encourage reselection
What are the three neighbor lists?
Active set
Monitored set
Detected set
What is the Active neighbor set?
Current serving cell, UE monitoring BCH/PCH.
May include multiple cells (PSCs) if in soft/softer handover.
What is the Monitored neighbor set?
List of cells network instructs UE to monitor called the neighbor list (GSM BA List equivalent).
Must be able to monitor up to 32 intra-freq, 32 inter-freq, & 32 inter-RAT cells.
What is the Detected neighbor set?
Cells discovered by UE not part of active or monitored.
What is the UARFCN/PCS pair for the Sync channel?
Ch 256,1
What is the UARFCN/PCS pair for the PCCPCH?
Ch 256,1
What is the UARFCN/PCS pair for the SCCPCH?
Ch 256,3
What is the UARFCN/PCS pair for the PICH?
Ch 256, 16
What limits the UMTS network?
Interference
What major feature was added in UMTS that did not exist in GSM
authentication?
Mutual Authentication
Which authentication vector is used by the handset to authenticate the
network?
Authentication token (AUTN)
Which authentication vector is used by the network to authenticate a
handset?
XRES
What is the air interface in a UMTS system?
Between the UE and the node B, called Uu (U sub-U)
