Glossary

ACRONYM / TERM DESCRIPTION
3G Third Generation A third generation mobile telecommunication system established according to IMT-2000/UMTS standards or standards developed based on these standards.
4.5G 4.5 Generation A generation containing technologies having more advanced features than standard 4G technology.
5G Fifth Generation The communication standard planned to be brought to life following current 4G technology.
ARPU Average Revenue Per User Average monthly revenue generated per mobile subscriber.
Base Station A fixed transceiver device in each cell of a mobile communications network enabling communication between mobile phones and radio signals within the cell.
Carrier Aggregation A technique allowing more bandwidth and consequently higher speeds to be obtained by joining frequencies called carriers.
DWDM Dense Wavelenght Division Multiplexing Technology that allows a few independent digital information flows to appear on the same optic cable.
FDD Frequency Division Duplex A technique using different frequency bands in sending and receiving processes within communication.
FTTX Fiber to the X Access technology carried out using fiber (FTTX service) internet and fiber optic cables.
GSM Global Mobile Communication System This is a digital mobile communication system, standardized by the European Communications Standards Institute and based on digital transmission with roaming and cellular network structure being used in Europe, Japan and various other countries. GSM systems operate at frequency bands of 900 Mhz and 1800 Mhz.
GSMA Groupe Speciale Mobile (GSM) Association An association consisting of companies associated with mobile operators and telecommunication to standardize and develop the mobile telecommunications sector.
HLR Home Location Register Central database that contains services of each mobile phone subscriber that is authorized to use the GSM/UMTS network.
HSPA High Speed Packet Access Technology established on WCDMA networks to increase package data performance.
HSS Home Subscriber Server Central database that contains services of each mobile phone subscriber that is authorized to use the LTE/VoLTE network. Current implementation is HSS and HLR is converged in a single HSS database, that serves all technologies on a mobile network (2G/3G/4.5G).
IMS IP Multimedia Subsystem Technology enabling audio service to be provided on the internet to fixed and mobile operators, independent from access; and the main audio infrastructure of the LTE network of mobile operators.
Interconnection The physical and logical connection of electronic communication networks to each other used by the same or a different operator to enable the communication of users of an operator with the users of the same or a different operator, or access to services provided by another operator.
ITU The International Telecommunication Union An international standardization institution with headquarters in Geneva that determines many standards in telecommunication.
LTE Long Term Evolution Technology capable of reaching very high speeds by joining carriers on the same or different frequency bands.
LTE-A Long Term Evolution - Advanced A mobile communications standard comprising advanced features such as carrier coupling, which enables mobile broadband speed of over 150 MBps in LTE.
M2M Machine To Machine The general name of technology enabling devices to exchange information and operate without human intervention.
Main and Midi POP Large and medium sized locations containing network equipment positioned nationwide.
Mbps Megabits per Second A data transmission speed. 1 Mbps equals 2(20) bpse.
MMS Multimedia Messaging Service A standard specified for advanced wireless terminals enabling the user to send and receive messages containing diverse multimedia content such as images, audio and visual videos with a single transmission in non-real time.
NDC Network Data center A data center where network equipment is positioned.
NGMN Next Generation Mobile Network An organization (Next Generation Mobile Networks Association), of which Turkcell is a member, and several operators, suppliers and universities in the world are a part of, giving direction to technology standards and technology producing companies in relation to operator requirements.
NMS Network Management System System and interfaces carrying out network management.
On-net A call originating from an operator network and ending on the same operator network.
Roaming A mobile communications feature enabling the subscribers of a network to use their own mobile phones and numbers within the coverage area of another operator.
Small Cell The entirety of small physical communication devices being the common notation of femtocell, picocell and microcell solutions, providing electronic communications services to subscribed terminal devices in the target location, and having lower output power compared to a base station.
SMS Short Message Service A mobile communication system allowing users to receive and send messages, which can be constituted of both alphabetic and numerical characters of up to 160 characters, to and from mobile phones through a short message service.
Tbps Terabits per Second A speed unit symbolizing 10^12 bits passing per second.
TDD Time Division Duplex The technique of using different time zones for sending and receiving processes on the same frequency band in two-way communication.
UMTS 900 Universal Mobile Telecommunications System 900 MHz This is the usage of UMTS Mobile technology on a 900 MHz frequency band. Thus, UMTS technology can be used on a frequency band providing high coverage such as 900 MHz.
Unified Communications The entirety of services enabling different communications devices (switchboard infrastructure, softclient, video conference, messaging) in the lives of corporate customers to be used on a single platform.
VoLTE Voice over LTE IP based high quality audio technology through a 4.5G network.
WebRTC Web Real Time Communication Technology enabling real-time communications (audio, video, messaging) services in the operator’s infrastructure to be transmitted to an end user by developing different services on the web.
WiFi Wireless Connection Area A standard generated for the transfer of data through wireless cables. Laptops, smart phones, PCs, etc. having a receiver and transmitter of WiFi standards can benefit from wireless broadband internet services.
WiFi Offload Enabling an uninterrupted transition of 3N/4N users to a WiFi network to increase connection performance and user experience.
WSON Wavelength Switched Optical Network Technology, in which automatic wave length routing is performed at an optical level in transmission technology.