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UMTS > General UMTS > Flashcards

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?

A

1900

21
Q

What frequency band is band class 4?

A

1700 AWS

22
Q

What frequency band is band class 5?

A

850

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
Q

What is a LAI comprised of?

A

PLMN and LAC

26
Q

What was the last version of UMTS?

A

Rel 7, HSPA+

27
Q

Which network component translates disparate protocols?

A

Media Gateway (MGW)

28
Q

What is the equation for suitability for FDD networks?

A

Squal = Qqualmeas – Qqualmin

29
Q

What is the equation for suitability for TDD networks?

A

Srxlev = Qrxlevmeas – Qrxlevmin

30
Q

What are the 3 types of neighbors?

A

Intra-frequency
Inter-frequency
Inter-RAT

31
Q

What is the formula for the ranking criteria of the serving cell?

A

R = Qmeas – Qhyst

32
Q

What is the formula for the ranking criteria of the neighbor cells?

A

R = Qmeas – Qoffset

33
Q

What is the Ec/No?

A

Ratio between actual energy and spectral noise

Value of 0 to -24

34
Q

What is Qmeas?

A

The measured Ec/No or RSCP of either the serving cell or neighbor cell

35
Q

What is Qhyst?

A

The value applied to the serving cell to dissuade UEs from moving

36
Q

What is Qoffset?

A

The value applied to neighbor cells. Can be a positive value to dissuade reselection or a negative value to encourage reselection

37
Q

What are the three neighbor lists?

A

Active set
Monitored set
Detected set

38
Q

What is the Active neighbor set?

A

Current serving cell, UE monitoring BCH/PCH.

May include multiple cells (PSCs) if in soft/softer handover.

39
Q

What is the Monitored neighbor set?

A

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
Q

What is the Detected neighbor set?

A

Cells discovered by UE not part of active or monitored.

41
Q

What is the UARFCN/PCS pair for the Sync channel?

A

Ch 256,1

42
Q

What is the UARFCN/PCS pair for the PCCPCH?

A

Ch 256,1

43
Q

What is the UARFCN/PCS pair for the SCCPCH?

A

Ch 256,3

44
Q

What is the UARFCN/PCS pair for the PICH?

A

Ch 256, 16

45
Q

What limits the UMTS network?

A

Interference

46
Q

What major feature was added in UMTS that did not exist in GSM
authentication?

A

Mutual Authentication

47
Q

Which authentication vector is used by the handset to authenticate the
network?

A

Authentication token (AUTN)

48
Q

Which authentication vector is used by the network to authenticate a
handset?

A

XRES

49
Q

What is the air interface in a UMTS system?

A

Between the UE and the node B, called Uu (U sub-U)

UMTS (5 decks)

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