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UMTS > Channels > Flashcards

Channels Flashcards

1
Q

What is the CPICH and what does it do?

A

Common Pilot Channel

Sets the radius of the cell, broadcasts the PSC, and is measured by the UE during selection and reselection

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2
Q

What is the synchronization channel?

A

The only channel not scrambled
Divided into primary and secondary
Broadcast 15 sync codes which indicate one of the 64 code groups

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3
Q

What is the PCCPCH and what is its role?

A

Primary Common Control Physical Channel
OVSF C256, 1
Decoded after a handset syncs to a PSC
Carries the Logical BCCH (broken into MIB and SIBs)

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4
Q

What is the SCCPCH and what is its role?

A

Secondary Common Control Channel
OVSF C256, 3
Carries the Logical Paging Control Channel (PCCH)
Carries the Logical Forward Access Channel (FACH)

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5
Q

What is the PICH and what is its role?

A

Paging Indication Channel
C256, 16, Lets a group of UEs know to “wake up” and decode Paging Messages on the SCCPCH. UEs hash to a PICH “slot” based on their IMSI

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6
Q

What is the PRACH and what is its role?

A

Physical Random-Access Channel

Sent by a UE to access the network, broken into a preamble and main message

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7
Q

What is the AICH and what is its role?

A

Acquisition Indication Channel

Sent by the network to acknowledge a PRACH Preamble, signal the UE to send the main message

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8
Q

What is the DPDCH and what is its role?

A

Dedicated Physical Data Channel
UMTS version of a Traffic Channel
Passes voice, text, or data on an assigned OVSF code.

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9
Q

What is the DPCCH and what is its role?

A

Dedicated Physical Control Channel
Passes control information while a handset is in an active state
Power control messages, neighbor measurements, handover commands, call waiting, text messages, etc

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10
Q

What is the BCCH and what is its role?

A

Broadcast Control Channel
Logical Channel
Contains system parameters and control information.
Information is broken into separate “blocks.”
One “Master Information Block.”
Several “System Information Blocks.”

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11
Q

What is a MIB?

A

Master Information Blocks
Broadcasts the PLMN
Acts as an index for the BCCH, broadcasts which SIBs will be present, in what order, and how frequently they will be broadcast

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12
Q

What is a SIB?

A

System Information Blocks

There are many SIBs that contain valuable information, but 1, 3, 5, 7, and 11 carry the commonly used system details

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13
Q

What is carried on SIB 1?

A

LAC
UARFCN/PSC
T3212 Timer
RAC

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14
Q

What is carried on SIB 3?

A

sSearch values
Reselection parameters
Cell bar indicator
UMTS mode (FDD/TDD)

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15
Q

What is carried on SIB 5?

A

PRACH info
AICH/PICH TX power
Channel details for SCCPCH, FACH, and PICH

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16
Q

What is carried on SIB 11?

A

HCS or non-HCS
Neighbor list
Neighbor Qoffset parameters

UMTS (5 decks)

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