Global System for Mobile Communication (GSM)


                      ADC
                            American Digital Cellular
                      AMPS
                            advanced mobile phone service
                      AoC
                            advice of charge
                      AUC
                            authentication center
                      bps
                            bits per second
                      BSC
                            base station controller
                      BSS
                            base station system
                      BTS
                            base transceiver station
                      CGI
                            cell global identity
                      CUG
                            closed user group
                      DCS
                            digital cellular system
                      DTMF
                            dual-tone multifrequency
                      EIR
                            equipment identity register
                      GIWU
                            GSM interworking unit
                      GMSC
                            gateway mobile services switching center
                      GMSK
                            Gaussian minimum shift keying
                      GSM
                            global system for mobile communication
                      HLR
                            home location register
                      Hz
                            hertz
                      ISDN
                            integrated services digital network
                      k
                            kilo
                      kbps
                            kilobits per second
                      LA
                            location area
                      LAI
                            location-area identity
                      LPC
                            linear predictive coding
                      MHz
                            megahertz
                      MSC
                            mobile services switching center
                      MSN
                            mobile service node
                      MXE
                            message center
                      NMT
                            Nordic Mobile Telephone
                      OMC
                            operations and maintenance center
                      OSS
                            operation and support system
                      PCS
                            personal communications services
                      PDC
                            personal digital cellular
                      PLMN
                            public land mobile network
                      SS
                            switching system
                      TACS
                            total access communication system
                      TDMA
                            time division multiple access
                      VLR
                            visitor location register
 

 

A short list of GPRS terms, abbreviations, interfaces, etc.

 

List of abbreviations


AA

Anonymous Access
Network does not know the real identity of the mobile.
Opposite to non-anonymous access.
AP Access Point
An entry point to external network.
APN
Access Point Name
Logical name of the point of entry to external packet data networks.
BG
Border Gateway
Logical box that connects two (or more) operators together via Inter-PLMN backbone. BG protects operatorís intra-PLMN network against intruders.
BSSAP+
Base Station System Application Part+
Protocol between SGSN and MSC/VLR
BSSGP
Base Station System GPRS Protocol
Protocol between SGSN and BSS.
CCU
Channel Codec Unit
Functional element in BSS that handles low level GPRS control in radio.
CLNS
Connection less network service
Like IP protocol.
CONS
Connection oriented network service
Like X.25 protocol.
CS
Circuit Switched
Opposite to packet switched.
DNS
Domain Name System
IP service that can be used to map logical name (e.g. "macronalds.com") to IP address (e.g., 134.114.5.17)
DRX
Discontinuous reception
Case, when MS does not all the time receive.
GGSN
Gateway GPRS Support Node
One of the new key functional elements of GPRS.
GMM/SM
GPRS Mobility Management and Session Management
Protocol stack between MS and SGSN that handles GPRS attach/detach, PDP context activation/deactivation, etc.
GTP
GPRS Tunnelling Protocol
Protocol between SGSN and GGSN to encapsulate user data and to carry GPRS signaling.
HPLMN
Home Public Land Mobile Network
The home network.
HSCSD
High Speed Circuit Switched Data
New GSM service for circuit switched connections
ICMP
Internet Control Message Protocol
IP network control protocol.
IETF
Internet Engineering Task Force
Internet standardization organization.
IMSI
International mobile subscriber identity
Userís unique ID in GSM/GPRS networks.
Interface
Well standardized point in the GPRS standard that typically has multivendor possibility. Opposite to reference point.
IP
Internet Protocol
IP is IP is IPÖ
IPv4
Internet Protocol version 4
The currently used IP version.
IPv6
Internet Protocol version 6
Next generation IP protocol, not yet widely used.
ISP
Internet Service Provider
The organization or operator that sells Internet access.
LLC
Logical Link Control
Protocol layer between MS and SGSN.
MAC
Medium Access Control
Protocol in the radio level that is used to allocated the radio channel.
MS
Mobile station
The phone (in general).
MTP2
Message Transfer Part layer 2
SS7 protocol layer 2.
MTP3
Message Transfer Part layer 3
SS7 protocol layer 3.
NS
Network Service
Protocol layer between BSS and SGSN.
NSAPI
Network layer Service Access Point Identifier
Identifier that specifies the PDP context in MS and in SGSN.
NSS
Network SubSystem
Network part of the network (in GPRS it means SGSN and GGSN).
P-TMSI
Packet TMSI
Packet systemís temporary mobileís identity.
PC
Personal Computer
A PC can be also a "laptop" computer.
PCU
Packet Control Unit
Functional element in BSS that handles upper level GPRS control in radio.
PDA
Personal Digital Assistant
A gadget that fits in hand and has limited services.
PDN
Packet Data Network
Network that carries user data in packets (e.g., Internet and X.25)
PDP
Packet Data Protocol, e.g., IP or X.25
Protocol that is used by user.
PDU
Protocol Data Unit
One data packet.
PPP
Point-to-Point protocol
Widely used protocol under IP to connect, e.g., PC and ISP via modems.
PTM
Point To Multipoint
One sender, multiple receivers.
PTP
Point To Point
One sender, one receiver.
QoS
Quality of Service
Definition of the service class of the connection between MS and the network.
RA
Routeing Area
A set of cells that belongs to one group. RA is always a subset of a LA (location area).
Reference point
Not so strictly followed standard like interface. This can be non-multivendor case.
Opposite to interface.
RLC
Radio Link Control
A protocol between MS and BSS to handled retransmission and other radio related issues.
SLIP
Serial Line IP protocol
Similar protocol like PPP.
SGSN
Serving GPRS Support Node
Second new functional element of the GPRS network.
SM
Short Message
Service to send/receive 140 bytes (160 characters) messages.
SM-SC
Short Message service Service Centre
A computer that handles short messages.
SMS-GMSC
Short Message Service Gateway MSC
MSC that is used to deliver data to/from SGSN.
SMS-IWMSC
Short Message Service Interworking MSC
MSC that is used to deliver data to/from SGSN.
SNDC
SubNetwork Dependent Convergence
Protocol layer between MS and SGSN.
SNDCP
SubNetwork Dependent Convergence Protocol
Protocol of the SNDC.
TCAP
Transaction Capabilities Application Part
SS7 protocol layer.
TCP
Transmission Control Protocol
Protocol layer on top of conventional IP protocol.
TE
Terminal equipment
Typically a computer, host.
TID
Tunnel Identifier
Identifier that identifies uniquely the MS and also the PDP context in the GPRS backbone network (between SGSN and GGSN).
TLLI
Temporary Logical Link Identity
Identifier of the mobile used between MS and SGSN,
UDP
User Datagram Protocol
Another protocol on top of IP.
VPLMN
Visited Public Land Mobile Network
The network where mobile is currently located.

List of interfaces


Gb

Interface between an SGSN and a BSS.
Gc
Interface between a GGSN and an HLR.
Gd
Interface between a SMS-GMSC and an SGSN, and between a SMS-IWMSC and an SGSN.
Gf
Interface between an SGSN and an EIR.
Gi
Reference point between GPRS and an external packet data network.
Gn
Interface between two GSNs within the same PLMN.
Gp
Interface between two GSNs in different PLMNs. The Gp interface allows support of GPRS network services across areas served by the co-operating GPRS PLMNs.
Gr
Interface between an SGSN and an HLR.
Gs
Interface between an SGSN and an MSC/VLR.
kbit/s
Kilobits per second.
R
Reference point between a non-ISDN compatible TE and MT. Typically this reference point supports a standard serial interface.
Um
Radio interface between MS and the network side.