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General UMTS Flashcards

1
Q

What does UMTS stand for?

A

Universal Mobile Telecommunications Service

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2
Q

How many Primary Scrambling Codes are available in UMTS?

A

512

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3
Q

What is a Primary Scrambling Code used to identify?

A

Separate tower sectors

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4
Q

Which network component controls multiple Node Bs?

A

Radio Network Controller (RNC)

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5
Q

Which network component allocates P-TMSIs?

A

Serving GPRS Support Node

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6
Q

The Packet-Switched UMTS network is broken into geographic regions called what?

A

Routing Area

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7
Q

What is the channel spacing in MHz used in UMTS?

A

5Mhz

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8
Q

What is the chipping rate of a UMTS channel?

A

3.84Mcps

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9
Q

What 2G technology is the foundation of UMTS?

A

GSM

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10
Q

How often does Closed Inner Loop power control happen?

A

Up to 1500 times a second

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11
Q

What is the step size in UMTS?

A

25 is the optimal step size

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12
Q

What is the geographic region controlled by an MSC?

A

LA

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13
Q

What multiple access scheme does UMTS use?

A

CDMA

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14
Q

What identifier uniquely identifies the Mobile Equipment?

A

International Mobile Equipment Identity (IMEI)

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15
Q

What identifies the make and model of a phone?

A

TAC

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16
Q

What identifier uniquely identifies a user’s subscription?

A

IMSI

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17
Q

What is the first release of UMTS called?

A

Release 99

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18
Q

What is the channel offset between uplink and downlink for band class 2?

A

80 MHz or 400 channels

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19
Q

What is the channel offset between uplink and downlink for band class 4?

A

400 MHz or 225 channels

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20
Q

What frequency band is band class 2?

21
Q

What frequency band is band class 4?

22
Q

What frequency band is band class 5?

23
Q

What four components make the Global Cell ID?

A

MCC, MNC, LAC and CID

24
Q

What physical channel is broadcast with OVSF code 0?

A

Common Pilot Channel (CPICH)

25
What is a LAI comprised of?
PLMN and LAC
26
What was the last version of UMTS?
Rel 7, HSPA+
27
Which network component translates disparate protocols?
Media Gateway (MGW)
28
What is the equation for suitability for FDD networks?
Squal = Qqualmeas – Qqualmin
29
What is the equation for suitability for TDD networks?
Srxlev = Qrxlevmeas – Qrxlevmin
30
What are the 3 types of neighbors?
Intra-frequency Inter-frequency Inter-RAT
31
What is the formula for the ranking criteria of the serving cell?
R = Qmeas – Qhyst
32
What is the formula for the ranking criteria of the neighbor cells?
R = Qmeas – Qoffset
33
What is the Ec/No?
Ratio between actual energy and spectral noise | Value of 0 to -24
34
What is Qmeas?
The measured Ec/No or RSCP of either the serving cell or neighbor cell
35
What is Qhyst?
The value applied to the serving cell to dissuade UEs from moving
36
What is Qoffset?
The value applied to neighbor cells. Can be a positive value to dissuade reselection or a negative value to encourage reselection
37
What are the three neighbor lists?
Active set Monitored set Detected set
38
What is the Active neighbor set?
Current serving cell, UE monitoring BCH/PCH. | May include multiple cells (PSCs) if in soft/softer handover.
39
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.
40
What is the Detected neighbor set?
Cells discovered by UE not part of active or monitored.
41
What is the UARFCN/PCS pair for the Sync channel?
Ch 256,1
42
What is the UARFCN/PCS pair for the PCCPCH?
Ch 256,1
43
What is the UARFCN/PCS pair for the SCCPCH?
Ch 256,3
44
What is the UARFCN/PCS pair for the PICH?
Ch 256, 16
45
What limits the UMTS network?
Interference
46
What major feature was added in UMTS that did not exist in GSM authentication?
Mutual Authentication
47
Which authentication vector is used by the handset to authenticate the network?
Authentication token (AUTN)
48
Which authentication vector is used by the network to authenticate a handset?
XRES
49
What is the air interface in a UMTS system?
Between the UE and the node B, called Uu (U sub-U)

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