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UMTS Flashcards

Acronyms, Channel protocols, Codes

1
Q

The first release version of UMTS

A

Rel. 99

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2
Q

What was introduced in Rel. 4?

A

Circuit Switched Media Gateways (CS-MGW)

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3
Q

What was introduced in Rel. 5?

A

The IP Multimedia Subsystem (IMS) and High Speed Downlink Packet Access (HSDPA)

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4
Q

What was introduced in Rel. 7?

A

MIMO antenna technology and higher data speeds

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5
Q

Rel. 8-10 introduced what?

A

Long Term Evolution (LTE)

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6
Q

What are the three entities that make up the UMTS network?

A

UTRAN, GERAN, and CORE Network

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7
Q

What components make up the UTRAN?

A

NodeB and RNC

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8
Q

What are the three domains in the CORE Network?

A

Circuit Switched Domain, Packet Switched Domain, Multi Media Domain

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9
Q

What does the Cell ID consist of?

A

RNC ID and the Short (Local) Cell ID

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10
Q

What is Hierarchical Cell Structure (HCS) used for?

A

HCS is a fake power applied to Cells by the Network that helps control which cells an UE will re-select to.

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11
Q

What are the two types of Power Control?

A

Forward and Reverse

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12
Q

What is Forward Closed Inner loop Power control?

A

Communication between the NodeB and UE to keep the Signal-Interference-Ratio (SIR) at the target level. The UE tells the NodeB to increase/decrease its power by 1dB up to 1500 times/second.

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13
Q

What is Forward Closed Outer loop Power control?

A

The UE requests a different T-SIR from the NodeB if it has Frame Error Rate (FER) trouble.

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14
Q

What is Reverse Open loop Power control?

A

The UE adjusts transmit power for preamble PRACHs based on the received CPICH (Common Pilot Channel).

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15
Q

What is Reverse Closed Inner loop Power control?

A

Communication between the NodeB and UE to keep the Signal-Interference-Ratio (SIR) at the target level. The NodeB tells the UE to increase/decrease its power by 1dB up to 1500 times/second.

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16
Q

What is Reverse Closed Outer loop Power control?

A

TSIR adjustment at the RNC level based on FER trouble

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17
Q

What are the two main components of a UE?

A

ME (Mobile Equipment), UICC (Universal Integrated Circuit Card)

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18
Q

What is contained on the UICC?

A

Universal Subscriber Identity Module (USIM), IMS Identity Module (ISIM)

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19
Q

What is the purpose of the Circuit Switched Media Gateway?

A

It establishes a P2P pipeline for voice traffic.

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20
Q

Is responsible for the delivery of data packets from and to the UEs within its geographical service area.

A

Serving GPRS Support Node (SGSN)

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21
Q

Geographical Service area for an SGSN.

A

Routing Area Code (RAC)

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22
Q

Responsible for accessing the external network on the Packet Switched Domain

A

Gateway GPRS Support Node (GGSN)

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23
Q

Area that falls under the Routing Area (RA)

A

UTRAN Registration Area (URA)

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24
Q

Multi Media Domain consists of?

A

IP Multi Media Subsystem (IMS)

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25
Q

Technology used to spread signal

A

Direct Sequence Spread Spectrum (DSSS)

26
Q

Technology used to spread data

A

Orthogonal Variable Spreading Factor (OVSF)

27
Q

Duplexing technology that uses a different uplink and downlink frequency

A

Frequency Division Duplex (FDD)

28
Q

Duplexing technology that uses the same frequency for uplink and downlink.

A

Time Division Duplex (TDD)

29
Q

How wide is the signal for UMTS

A

5MHz total; the actual signal is only 3.84MHz

30
Q

A radio channel in UMTS that is a pair of frequencies

31
Q

The number of slots in a UMTS frame

A

15; numbered 0-14

32
Q

The collected RF received after decoding the CPICH

A

Received Signal Code Power (RSCP)

33
Q

The ratio between the received Energy per Chip of the CPICH and the total Noise level

34
Q

Value that takes into account both RSCP and Ec/No

A

RSSI; RSSI = RSCP - Ec/No

35
Q

What is the purpose of the Primary Synchronization Code?

A

Signals the start of a time slot

36
Q

How many Secondary Synchronization Codes are there?

37
Q

What is the function of Channelization Codes?

A

OVSF (Channelization) codes are used to spread the data. They separate connections to different users on the downlink. 256 in total.

38
Q

Describe Downlink Scrambling Codes

A

The Primary Scrambling Code (PSC), also known as Gold Codes, they distinguish different sectors. 512 possible codes in total.

39
Q

Describe Uplink Scrambling Codes

A

Also known as Gold Codes, they distinguish different UEs. 16+ million in total.

40
Q

What are the three types of Channels in UMTS?

A

Physical, Transport, and Logical

41
Q

Physical Channel used to acquire time slot sync on a Cell

A

Primary Synchronization Channel (P-SCH)

42
Q

Physical Channel used to acquire frame sync and code group

A

Secondary Synchronization Channel (S-SCH)

43
Q

Physical Channel that contains the Broadcast Control Channel Information

A

Primary Common Control Physical Channel (P-CCPCH)

44
Q

Physical Channel that contains paging and Forward Access Channel parameters

A

Secondary Common Control Physical Channel (S-CCPCH)

45
Q

Physical channel that broadcasts the cell radius and power

A

Common Pilot Channel (CPICH)

46
Q

Physical Channel that contains Paging Channel and Forward Access Channel information

A

Paging Indicator Channel (PICH)

47
Q

Physical Channel for acknowledgement

A

Acquisition Indicator Channel (AICH)

48
Q

“Traffic Channel”

A

Dedicated Physical Data Channel (DPDCH)

49
Q

Physical channel that sends radio control information (power control)

A

Dedicated Physical Control Channel (DPCCH)

50
Q

Physical Channel that is used to send quick signaling information to a group/several users

A

Physical Downlink Shared Channel (PDSCH)

51
Q

Physical Channel used to gain network access

A

Physical Random Access Channel (PRACH)

52
Q

Physical Channel used to send short to medium sized packets

A

Physical Common Packet Channel (PCPCH)

53
Q

Describe a RAKE receiver

A

Antenna that resolves and combines multi-path signals to reduce fading. Utilized during Soft Handoffs.

54
Q

What are the five Radio Resource Connection States?

A

RRC_Idle; Cell_DCH; Cell_PCH; Cell_FACH; URA_PCH

55
Q

What does SIB 1 transmit?

A

BCCH information

56
Q

What does SIB 3 transmit?

A

Cell re-selection measurements

57
Q

What does SIB 11 transmit?

A

Neighbors list

58
Q

How many security algorithms does UMTS have?

59
Q

What are the Authentication Vectors (Quintet)

A

RAND, XRES, CK, IK, AUTN

60
Q

What are the cell re-selection measurements?

A

Sintersearch (different UARFCNS); Sintrasearch (same UARFCN); SsearchRAT (different Technologies); SsearchHCS

61
Q

How does a UE measure for cell re-selection?

A

Squal and Srxlev

62
Q

What is an inter-system handoff?

A

Handoff to a different Radio Access Technology

MODE3 (1 decks)

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