Tuesday, March 14, 2017

Telecomm Acronyms

ADD: Automatic Device Detection

AMBR: Aggregate Maximum Bit Rate

APN-OI: APN Operator Identifier.

BSC: Base Station Controller.

BTS: Base Transceiver Station.

CBE: Cell Broadcast Entity. Entity in a Cell Broadcast Service (CBS).

CS: Circuit Switched.

CSI: Camel Subscription Information. CAMEL Subscription Information (CSI) is part of the subscriber data that is stored in the HLR. The CSI indicates that the subscriber has CAMEL services.

T-CSI: Terminating CAMEL Subscription Information (T-CSI) identifies the subscriber as having terminating CAMEL services.

SS-CSI: Terminating CAMEL Subscription Information (T-CSI) identifies the subscriber as having terminating CAMEL services.

TIF-SCI: The Translation Information Flag CAMEL Subscription Information (TIF-CSI) is located in the CAMEL subscriber data in the HLR. If the HLR receives a request from a CAMEL subscriber with the O-CSI to register a forwarded-to number and the TIF-CSI is not set, the HLR applies the usual procedure.

U-CSI: USSD CAMEL Subscription Information (U-CSI) identifies a set of subscriber-specific mappings from a USSD service code to a gsmSCF address.

UG-CSI: General USSD CAMEL Subscription Information (UG-CSI) identifies a set of mappings from a USSD service code to a gsmSCF address.

VT-CSI: General USSD CAMEL Subscription Information (UG-CSI) identifies a set of mappings from a USSD service code to a gsmSCF address.

D-CSI: The Dialed service CAMEL Subscription Information (D-CSI) identifies the subscriber as having home network operator dialed CAMEL services.

SMS-CSI: The Dialed service CAMEL Subscription Information (D-CSI) identifies the subscriber as having home network operator dialed CAMEL services.

M-CSI: The Mobility management event notification CAMEL Subscription Information (M-CSI) contains subscription information for subscribers that require CAMEL support of mobility management events.

GPRS-CSI: The GPRS Camel Subscription Information (GPRS-CSI) contains subscription
information of the subscribers having the GPRS CAMEL service.

N-CSI: The Network-dialed service CAMEL Subscription Information (N-CSI) identifies the roaming network operator dialed CAMEL services.

CSG: Closed subscriber group. It is a limited set of users with connectivity access to a femtocell. When a femtocell is configured in CSG mode, only those users included in the femtocell's access control list are allowed to use the femtocell resources. On the other hand, a femtocell can be also configured in Open Access mode, in which any user is allowed access to the femtocell.

CSS: CSG(Closed subscriber group) Subscriber Server.

IMEISV: This parameter is the International Mobile Equipment Identity and Software Version Number defined in 3GPP TS 23.003 [17].

MTRF: Mobile Terminating Roaming Forwarding with pre-paging

CUG: Closed User Groups. Groups of GSM mobile telephone subscribers who can only make calls and receive calls from members within the group. This service is not usable with the short messaging service (SMS) system. A closed access femto will accept LAU (Location Area Update) only from a subscriber who is in the ACL (Access Control List) of the femto, the other subscriber, named as Public User, who is not in the ACL will get a reject with a roaming not allowed cause 13 or 15.

CSCF: Call Session Control Function

G-MSC (GMSC)Gateway MSC is the MSC that determines which "visited MSC (V-MSC)" the subscriber who is being called is currently located at. It also interfaces with the PSTN. All mobile to mobile calls and PSTN to mobile calls are routed through a G-MSC.

eMLPP: enhanced Multi-Level Precedence and Pre-emption

FPLMN: Forbidden Public Land Mobile Network

HPLMN: Home Public Land Mobile Network

ISD: Insert Subscriber Data

LCS: Location Services.

LIPA: Local IP Access.

LMSI: This parameter refers to a local identity allocated by the VLR to a given subscriber for internal management of data in the VLR. LMSI shall not be sent to the SGSN.

LMU: Location Measurement Unit.

MC: Multicall. The Multicall supplementary service enables a mobile subscriber to have several simultaneous CS calls, each call using its own dedicated bearer.

MDT: Minimization of Drive Tests

MO-LR: Mobile Originated Location Request

MO-SMS-CSI: Mobile Originated - Short Message Service - CAMEL Subscription Information.

MS: Mobile Station comprises all user equipment and software needed for communication with a mobile network.The term refers to the global system connected to the mobile network, i.e. a mobile phone or mobile computer connected using a mobile broadband adapter. This is the terminology of 2G systems like GSM. In 3G systems, a mobile station (MS) is now referred to as user equipment (UE).

MSS: Mobile Soft Switch.

MT-SMS-CSI: Mobile Terminated - Short Message Service - CAMEL Subscription Information

O-CSI: Originating CAMEL Subscription Information (O-CSI) identifies the subscriber as having originating CAMEL services.

OMC-ID: Identity of an Operation and Maintenance Centre.

P-CSCF: Proxy-CSCF is a SIP proxy that is the first point of contact for the IMS terminal.

PDP: Packet Data Protocol. The PDP addresses are network layer addresses (Open Standards Interconnect [OSI] model Layer 3).

PWS: Public Warning System

SBC: Session Border Controller

SRVCC: Single Radio Voice Call Continuity.

SoLSA Support Indicator

Support of Localised service area

Localised Service Area (LSA):
A localised service area consists of a cell or a number of cells within a PLMN.


Immediate Service Termination (IST)
3GPP TS 23.035


Long FTN Supported
This parameter indicates that the VLR supports Long Forwarded-to Numbers.


V-GMLC: Visited GMLC
R-GMLC: Requesting GMLC
H-GMLC: Home GMLC




Supported RAT Types Indicator: This parameter indicates, if present, which access technologies (e.g. GERAN and / or UTRAN) are served by the MSC/VLR



SS-Code: single supplementary service

UE:  user equipment

VBS: Voice Broadcast

TAU corresponds to Tracking Area Update in LTE and RAU corresponds to Routing Area Update in GERAN/UTRAN

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