Block 4 / Unit 2: Global System or Mobile (GSM) Communications
What technique does GSM use to transmit signals?
(TDMA) Time Division Multiple Multiple Access
How many decimals places in a Spare (SP)?
1 decimal place.
How many decimal places for a Mobile Network Code (MNC)?
2 decimal decimal places Identification of mobile network within the country
What's (IMEI) International Mobile Equipment Identity
A unique serial number used to identify a mobile or satellite phone.
What's AUC?
Authentication Center Protected database that stores a copy of the secret key stored in each subscriber's SIM card
What's CI?
Cell Identifier
What's a Mobile Subscriber ISDN Number (MSISDN) made up of?
Country Code (CC) + National Destination Code (NDC) + Subscriber Number (SN)
What's Home HLR?
Home Location Register Considered the most important database, as it stores permanent data about subscribers, including service profile, location , information, and activity status
What are the benefits of using GSM?
Improved spectrum efficiency International roaming Low-cost mobile sets and base stations (BSs) High-quality speech Compatibility with Integrated Integrated Services Digital Network (ISDN) and other telephone company services Support for new services
What's OMC?
Operations and Maintenance Center connects to all the switching systems and provides security management, network configuration and maintenance tasks.
What's a PLMN?
Public Land Mobile Network The area covered by one network operator
What's a TMSI?
Temporary Mobile Subscriber Identity Can be assigned by the VLR, which is responsible for the current location of a subscriber
How many decimal places for a National Destination Code (NDC)?
Typically 2-3 decimal places
How many decimal places for a Country Code (CC)?
Up to 3 decimal places National Destination Code
What's VLR?
Visitor Location Register A database that contains temporary information about subscribers that is needed by the MSC in order to service visiting subscribers
How many decimal places in a Mobile Network Code (MNC)?
2 decimal places
How many decimal places in a Mobile Country Code (MCC)?
3 decimal places Internationally standardized
How many decimal places in a Country Code (CC)?
3 decimal places.
How many decimals places in a Final Assembly Code (FAC) and how is it assigned?
6 decimal places, assigned by the manufacturer
How many decimals places in a Serial Number (SNR) and how is it assigned?
6 decimal places, assigned by the manufacturer
How many decimals places in a Type Approval Code (TAC) and how is it assigned?
6 decimal places, centrally assigned
How many kbps to mbps can GSM carry in data rates?
64 kbps to 120 Mbps
How does GSM operate in the US in the bans?
850 MHz and 1900 MHz
In a GSM network what's a cell?
A cell tower or station that covers a basic service area every cell has a unique Cell Global Identity (CGI) number
In a GSM network what's a location area?
A group of cells
What's BSC?
Base Station Controller Controls of and supervises a number of BTSs
What's a BTS?
Base Transceiver Stattion A piece of equipment that facilitates wireless communication between user equipment and a network.
What's Location Area Identity (LAI) made up of?
Country Code (CC) Mobile Network Code (MNC) Location Area Code (LAC) :
How does GSM divide its 200 KHZ channel?
Eight 25 KHz time-slots
What's EIR?
Equipment Identity Register A database database that contains contains a list of all valid mobile equipment equipment on the network
What does GSM stand for and what does it do?
Global System for Mobile Communication Digital cellular technology used for transmitting mobile voice and data services
What is the GSM architecture comprised pf?
Home Location Register (HLR) Visitor Location Register (VLR) Equipment Identity Register (EIR) Authentication Center (AuC) SMS Serving Center (SMS SC) Gateway MSC (GMSC) Chargeback Center (CBC) Transcoder and Adaptation Unit (TRAU
What is a IMSI and what does it comprise of?
International Mobile Subscriber Identity + Mobile Country Code (MCC) + Mobile Network Code (MNC) + Mobile Subscriber Identification Number (MSIN)
What's LMSI?
Local Mobile Subscriber Identity An original key, by the VLR, that can be used to search mobile stations within its region.
What's a LAI?
Location Area Identity Identifies its own authentic Location Area Identity
How many decimal places for a Mobile Mobile Subscriber Identification Number (MSIN)?
Maximum 10 decimal places Identification number of the subscriber in the home mobile network
How many decimal places for a Subscriber Number (SN)?
Maximum 10 decimal places.
How many decimal places in a Location Area Code (LAC)?
Maximum 5 decimal places or maximum twice 8 bits coded in hexadecimal (LAC < FFFF).
What's MSC?
Mobile Services Switching Center Performs the switching of calls between the mobile and other fixed or mobile network users
What's (MSRN)?
Mobile Station Roaming Number An interim location dependent ISDN number, assigned to a mobile by a regionally responsible Visitor Location Register (VLA).
What's (MSISDN)?
Mobile Subscriber ISDN Number The authentic telephone number of a mobile
The MSRN has the same structure as what?
Mobile Subscriber ISDN Number (MSISDN) Country Code (CC) + National Destination Code (NDC) + Subscriber Number (SN)
What's the NSS and what is it made up of?
The Network Switching System + Home Location Register (HLR) + Mobile Services Switching Center (MSC) + Visitor Location Register (VLR) + Authentication Center (AUC) + Equipment Identity Register (EIR)
What's OSS?
The Operation Support Subsystem Provides a network overview and supports the maintenance activities of different operations and maintenance organizations
What is roaming?
The ability to use your GSM phone number in another GSM network
What is a IMEI made up of?
Type Approval Code (TAC) + Final Assembly Code (FAC) + Serial Number (SNR) + Spare (SP)
