SMS is sent on what logical channel when the handset is in a traffic channel already?
Slow Associated Control Channel (SACCH).
The frequency difference between the uplink and downlink in GSM is called what?
Offset.
What are the two types of radio interference encountered in GSM?
Co-channel interference – occurs when the same ARFCN is used and two towers and the handset cannot differentiate between them.
Adjacent-channel interference – two different channels are used but are too close each other causing interference at the channel’s edges.
What is the purpose of frequency reuse?
To maximize users without buying more frequency and avoiding Co-channel interference.
What identity is used on the PCH?
Temporary Mobile Subscriber Identity (TMSI).
What logical channel initiates a handover?
Fast Associated Control Channel (FACCH).
What duplex scheme does GSM use?
Frequency Division Duplex (FDD), Half-Duplex.
What are the CONUS GSM bands?
850 MHz, 1900 MHz.
What is the PLMN for AT&T?
310 410.
What network parameter makes an ARFCN look artificially worse?
Temporary Offset (For the duration of the Penalty Timer).
Which authentication vector authenticates a handset?
Signed Response (SRES).
Frequency Correction Channel (FCCH), Synchronization Channel (SCH), Broadcast Control Channel (BCCH).
What are the OCONUS GSM bands?
900 MHz, 1800 MHz.
What is the PLMN for T-Mobile?
310 260.
Which network parameter dictates periodic registration?
T3212 Timer.
Which Authentication vector is used for encryption?
Kc (Ciphering Key).
What are the three Common Control Channels (CCCH)?
Paging Channel (PCH), Random Access Channel (RACH), Access Grant Channel (AGCH).
What is the Traffic Channel (TCH) used for?
It is used for all user traffic to include voice calls, texts and data.
What is an LAI and what is it comprised of?
Location Area Identity. MCC/MNC/LAC.
Which network parameter prevents unnecessary registrations at LAC boundaries?
Cell Reselection Hysterisis (CRH).
In which logical channel does authentication occur?
Standalone Dedicated Control Channel (SDCCH).
What are the three Dedicated Control Channels (DCCH)?
Standalone Dedicated Control Channel (SDCCH), Slow Associated Control Channel (SACCH), Fast Associated Control Channel (FACCH).
The BSIC is sent on what logical channel?
Synchronization Channel (SCH).
What is a GCI and what is it comprised of?
Global Cell ID. MCC/MNC/LAC/CI.
What is reject code 6?
Illegal IMEI.