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There are 37 names in this directory beginning with the letter I.
I-Mode or iMode

I-Mode, also known as iMode, is a popular wireless Internet service by NTT DoCoMo Inc. in Japan. It's based on a simplified form of HTML and delivers packet-based information — such as games, e-mail and even business applications — to handheld devices.

IBSS: Independent Basic Service Set

Independent Basic Service Set (IBSS), also known as an ad hoc network. It is an 802.11 network comprising a collection of stations that communicate with each other, but not with a network infrastructure. Do not confuse it with Infrastructure BSS.

IBSS: Infrastructure BSS

Infrastructure BSS (IBSS) is an 802.11 network comprising an access point and stations. The access point forwards information to target stations or to a fixed network.

iDEN: Integrated Digital Enhanced Networ

Integrated Digital Enhanced Network (iDEN) is a Motorola-enhanced mobile radio network technology that integrates two-way radio, telephone, text messaging, and data transmission into a single network. iDEN wireless handsets are utilized in a variety of work environments ranging from manufacturing floors to executive conference rooms as well as mobile sales forces.

IF: Intermediate Frequency

Intermediate Frequency (IF) is a frequency to which a carrier frequency is shifted as an intermediate step in transmission or reception. Intermediate electromagnetic frequencies is generated by a superheterodyne radio receiver.

IM-HSS: IP Multimedia – Home Subscriber

The IP Multimedia – Home Subscriber Service (IM-HSS), also known as HSS, is the IP Multimedia Subsystem (IMS) service and user data repository. It plays a key role in provisioning, service creation, enabling subscriber data, and managing control, roaming and interconnection. The IM-HSS: (1) Supports IMS level authentication and authorization; (2) Maintains IMS subscriber profile(s) independent of access types; (3) Maintains service-specific data; (4) Keeps track of currently assigned S-CSCF and (5) Supports CSCF and AS access.

IMEI: International Mobile Equipment Ide

The International Mobile Equipment Identity (IMEI) is a number unique to every GSM and UMTS mobile phone. It is usually found printed on the phone underneath the battery and can also be found by dialling the sequence *#06# into the phone. The IMEI number is used by the GSM network to identify valid devices and therefore can be used to stop a stolen phone from accessing the network. For example, if a mobile phone is stolen, the owner can call his or her network provider and instruct them to “ban” the phone using its IMEI number. This renders the phone useless, regardless of whether the phone's SIM is changed.

IMPI: IP Multimedia Private Identity

IP Multimedia Private Identity (IMPI) is one of the two identities used by an IP Multimedia Subsystem (IMS). The other one is the IP Multimedia Public Identity (IMPU). Both are not phone numbers or other series of digits, but URIs, that can be digits (a tel-uri, like tel:+1-555-123-4567) or alphanumeric identifiers (a sip-uri, like The IMPI is unique to the phone, and you can have multiple IMPU per IMPI (often a tel-uri and a sip-uri). The IMPU can also be shared with another phone, so both can be reached with the same identity (for example, a single phone-number for an entire family).

IMPU: IP Multimedia Public Identity

IP Multimedia Public Identity (IMPU) is one of the two identities used by an IP Multimedia Subsystem (IMS). The other one is the IP Multimedia Private Identity (IMPI). Both are not phone numbers or other series of digits, but URIs, that can be digits (a tel-uri, like tel:+1-555-123-4567) or alphanumeric identifiers (a sip-uri, like The IMPI is unique to the phone, and you can have multiple IMPU per IMPI (often a tel-uri and a sip-uri). The IMPU can also be shared with another phone, so both can be reached with the same identity (for example, a single phone-number for an entire family).

IMS-MGW: IP Multimedia Subsystem Media G

IP Multimedia Subsystem Media Gateway (IMS-MGW), a component in the IP Multimedia Subsystem (IMS) 3G architecture, can terminate bearer channels from a switched circuit network and media streams from a packet network. It can support media conversion, bearer control, and payload processing (e.g., using codecs, echo cancellers, or conference bridges).

IMS: IP Multimedia Subsystem

The IP Multimedia Subsystem (IMS) is a standardised Next Generation Networking (NGN) architecture for telecom operators that want to provide mobile and fixed multimedia services. It uses a Voice-over-IP (VoIP) implementation based on a 3GPP standardised implementation of SIP, and runs over the standard Internet Protocol (IP). Existing phone systems (both packet-switched and circuit-switched) are supported.

IMSI: International Mobile Station Ident

International Mobile Station Identity (IMSI) is a unique 15-digit number assigned to a mobile station at the time of service subscription. It contains a mobile country code, a mobile network code, mobile subscriber identification number, and a national mobile subscriber identity. The MS sends the IMSI to a BTS for identification of the MS in the GSM network. The BTS looks for the IMSI in the HLR.

IMSI: International Mobile Subscriber Id

International Mobile Subscriber Identity (IMSI) is a unique number that is associated with all GSM and Universal Mobile Telecommunications System (UMTS) network mobile phone users. The number is stored in the Subscriber Identity Module (SIM). It is sent by the mobile phone to the network and is also used to acquire other details of the mobile in the Home Location Register (HLR) or as locally copied in the Visitor Location Register. In order to avoid the subscriber being identified and tracked by eavesdroppers on the radio interface, the IMSI is sent as rarely as possible and a randomly generated TMSI is sent instead.

IMT-2000: International Mobile Telecommu

International Mobile Telecommunication 2000 (IMT-2000) is a group of technologies defined by ITU-T for the third generation mobile telephony. It can also be applied to mobile telephone standards that meet a number of requirements in terms of transmission speed and other factors.

IMTA: International Mobile Telecommunica

International Mobile Telecommunications Association (IMTA) is a trade group serving specialized mobile radio and public access mobile radio carriers around the world.

IMTS: Improved Mobile Telephone Service

Improved Mobile Telephone Service (IMTS) is the commercial form of mobile telephone service preceding cellular that allowed users to place and receive their own calls through the use of a dial or keypad on the telephone.

IN: Intelligent Network

Intelligent Network (IN) often referred to as the Advanced Intelligent Network, this is a network of equipment, software and protocols used to implement features on the network and support switching and control functions.


InFLEXion is the narrowband PCS technology developed by Motorola Inc. that allows for voice paging.


Infrared is the electromagnetic waves whose frequency range is above that of microwaves, but below that of the visible spectrum.


Interferance is the effect that occurs when undesired signals inhibits or degrades the reception of a desired signal.

IR: Incremental Redundancy

Incremental redundancy (IR) is the feature used by EDGE (EGPRS) systems to get maximum performance out of the available bandwidth. It works by first sending only the minimum amount of redundant data, i.e. in most cases, no redundant data. If the data is not decoded properly, the system will resend the same data using a different puncture or coding scheme, increasing the amount of redundant data and the likelihood of recovering from the errors. If data is retransmitted using a different puncture or coding scheme, it is then recombined with the first transmission to increase redundancy.

IRC: Infrared communication

InfraRed Communication (IRC), is employed in short-range communications among computer peripherals and personal digital assistants. These devices usually conform to standards published by IrDA, the Infrared Data Association. Remote controls and IrDA devices use infrared light-emitting diodes (LEDs) to emit infrared radiation which is focused by a plastic lens into a narrow beam. The beam is modulated, i.e. switched on and off, to encode the data. The receiver uses a silicon photodiode to convert the infrared radiation to an electric current. It responds only to the rapidly pulsing signal created by the transmitter, and filters out slowly changing infrared radiation from ambient light. Infrared communications are useful for indoor use in areas of high population density. IR does not penetrate walls and so does not interfere with other devices in adjoining rooms.

IrDA: Infrared Data Association

Infrared Data Association (IrDA) is an industry organization that creates standards for hardware and software used in infrared communications. Information is transferred via rays of light, as opposed to radio waves. Most TV remote controls use infrared. IrDA standards have been implemented on various computer platforms and, more recently, have become available for many embedded applications.

IrOBEX: Infrared OBject Exchange

Infrared OBject EXchange (IrOBEX) or OBEX) is a communications protocol that facilitates the exchange of binary objects between devices. It is maintained by the Infrared Data Association but has also been adopted by the Bluetooth Special Interest Group and the SyncML wing of the OMA. One of OBEX's earliest popular applications was in the Palm III personal digital assistant. This PDA and its many successors use OBEX to exchange business cards, data, even applications.


IS-136, replacing IS-54 of the original tDMA standard, is the second-generation (2G) mobile phone systems used in the D-AMPS. IS-136 uses Time Division Multiple Access(TDMA) as an air interface.


IS-2000, also known as EIA Interim Standard 2000, is a standard for current CDMA systems providing a migration path to 3G services.


IS-41, also known as ANSI-41 since it is a standard defined by ANSI, is a specification for identifying and authenticating users, and routing calls on mobile phone networks based on MPS (analog), IS-136 (TDMA) and CDMA technologies. The standard also defines how users are identified, and calls are routed when roaming across different networks. GSM and WCDMA networks use a different standard known as MAP for the same purpose.


IS-54, an EIA Interim Standard for U.S. Digital Cellular (USDC), is the original TDMA digital standard implemented in 1992. This standard was the first to permit the use digital channels in AMPS systems. It used digital traffic channels but retained the use of analog control channels. This standard was replaced by the IS-136 digital standard in 1996.


The IS-634 interface is a standard defined by TIA/EIA that defines the messaging interface between a TDMA Base Station (BS) and a Mobile Switching Center (MSC). This interface uses the services provided by Connection Oriented SCCP for its transport layer. IS-634 is deployed worldwide in the cdmaOne mobile wireless networks.


IS-661 is a North American standard for 1.9 GHz wireless spread spectrum radio-frequency access technology developed by Omnipoint Corp. IS-661, for which Omnipoint was awarded a pioneer's preference license for the New York City market, is based on a composite of code division multiple access and time division multiple access technologies. The company says IS-661 reduces infrastructure costs and allows higher data speeds than mainstream GSM or TDMA platforms.


IS-95a, an EIA Interim Standard 95, is the original digital mobile telephony standard based on CDMA technology. It is applied in the cdmaOne mobile network


IS-95b is an upgraded version of IS-95a for the cdmaOne mobile network that increases the maximum data rate to 115.2 kb/s.

ISI: Inter-Symbol Interference

Inter-Symbol Interference (ISI) is an interference effect where energy from prior symbols in a bit stream is present in later symbols. ISI is normally caused by filtering of the data streams.

ISIM: IP Multimedia Services Identity Mo

IP Multimedia Services Identity Module (ISIM) is an application running on a Universal Integrated Circuit Card (UICC) smart card in a 3G mobile telephone in the IP Multimedia Subsystem (IMS). It contains parameters for identifying and authenticating the user to the IMS. The ISIM application can co-exist with SIM and USIM on the same UICC making it possible to use the same smart card in both GSM networks and earlier releases of UMTS.


iTAP, also known as T9 TM text input, is a application installed on wireless phones and handheld devices that allows you to type messages with just one key press per letter using the keypad. It is a much easier text input method than the traditional multi-tapping.

ITU: International Telecommunications Un

International Telecommunications Union (ITU) is a United Nations agency that deals with telecommunications issues.

IWF: Interworking Function

Interworking Function (IWF) is a technique for interfacing data between a wireless system and the telephone network. It usually involves the use of modems or data terminal adapters to convert the data transmitted over the air interface and mobile network to a format that can be recognized and carried by the public telecommunications network.

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