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There are 48 names in this directory beginning with the letter E.
E-AGCH: E-DCH Absolute Grant Channel

E-DCH Absolute Grant Channel(E-AGCH) is one of the five Enhanced Dedicated Channels (E-DCH), which provides an absolute power level above the level for the DPDCH (associated with a DCH) that the UE should adopt. E-AGCH tell a UE how to regulate its transmit power level.

E-DCH: Enhanced Dedicated Channel

Enhanced Dedicated Channel (E-DCH) is a transport uplink channel used in the 3G technologies (such as HSUPA) to improve capacity and data throughput and reduce the delays in dedicated channels in the uplink. The maximum theoretical uplink data rate that can be achieved is 5.6 Mbps. As with HSDPA, E-DCH relies on improvements implemented both in the PHY and the MAC layer. The definition of the E-DCH introduces five new physical layer channels: E-DPDCH, E-DPCCH, E-AGCH, E-RGCH and E-HICH.

E-DPCCH: E-DCH Dedicated Physical Contro

E-DCH Dedicated Physical Control Channel (E-DPCCH) is one of the five Enhanced Dedicated Channels (E-DCH), which controls channels associated with the E-DPDCH providing information to the Node-B on how to decode the E-DPDCH.

E-DPDCH: E-DCH Dedicated Physical Data C

E-DCH Dedicated Physical Data Control Channel (E-DPDCH) is one of the five Enhanced Dedicated Channels (E-DCH), which is the physical channel used by E-DCH for the transmission of user data.

E-GSM: Extended Global System for Mobile

EGSM is an extension to the GSM900 spectrum. EGSM spectrum is 880-890 MHz paired with 925-935 MHz, which is just below the original GSM 900 band. EGSM is a small radio frequency band used in Europe to provide added network capacity for GSM 900 networks. The additional 10Mhz provides an additional 50 channels.

E-HICH: E-DCH HARQ Acknowledgement Indic

E-DCH HARQ Acknowledgement Indicator Channel (E-HIGH) is one of the five Enhanced Dedicated Channels (E-DCH), which is used by Node-B to send HARQ ACK/NACK messages back to the UE.

E-RGCH: E-DCH Relative Grant Channel

E-DCH Relative Grant Channel(E-RGCH) is one of the five Enhanced Dedicated Channels (E-DCH), which indicates to the UE whether to increase, decrease or keep unchanged the transmit power level of the E-DCH.

E-TAGS: Extended Total Access Communicat

E-TAGS is Extension of the TACS (Total Access Communications System) system through the allocation of additional radio channels.

E-TDMA: Enhanced or exended TDMA

Enhanced or exended TDMA (E-TDMA) is an enhanced version of TDMA which will not only serve cellular, but could provide PCN-like services within current spectrum allocations.

E-UTRA: Evolved-UMTS Terrestrial Radio A

Evolved-UMTS Terrestrial Radio Access (E-UTRA or EUTRA), also known as UMTS Long Term Evolution (3GPP LTE) or Evolved UMTS Terrestrial Radio Access Network (EUTRAN), is specified in the 3GPP release 8. It is a key 3G technology to ensure the competitiveness of UMTS and provide a high-data-rate, low-latency and packet-optimized system. Besides peak data rates of 100 Mbps in downlink and 50 Mbps in uplink, a significant increase in spectrum efficiency and capacity as well as a significant latency reduction are planned. Commercial aspects like costs for installing and operating the network form also part of the requirements.


E.214 is a telephone numbering plan used for delivering mobility management related messages in GSM networks. The E.214 number derived from the IMSI E.214 numbers are composed of two parts. The first, the E.164 part, is made up of a country code followed by the network code. The second part of the number is made from the MSIN part of the IMSI which identifies an individual subscriber. For more details on the derivation of the E.214 number from the IMSI, see the article about the IMSI.

EA: Economic Area

Economic Area (EA) is a geographic area over which a WCS operator is licensed to provide service. EAs are a group of counties in metropolitan areas having common financial, commercial and economic ties and were first used to license WCS service in the late '90s. EAs are about the size of a cellular MSA and cross state lines in some instances. EAs are used by the FCC to define areas of economic interest and are grouped into larger areas called REAGs.

EAP-TLS: Extensible Authentication Proto

Extensible Authentication Protocol with Transport Layer Security (EAP-TLS) enables authenticaton between WLAN devices using certificates.

EAP: Extensible Authentication Protocol

Extensible Authentication Protocol (EAP) is a general layer 2 protocol for authentication EAP supports multiple authentication mechanisms. EAP does not select a specific authentication mechanism at Link Control Phase, but rather postpones this until the Authentication Phase. This allows the authenticator to request more information before determining the specific authentication mechanism. This also permits the use of a “back-end” server which actually implements the various mechanisms while the PPP authenticator merely passes through the authentication exchange.

EAPoW: Extensible Authentication Protoco

Extensible Authentication Protocol over Wireless (EAPoW) is a term used when EAPoL messages are encapsulated over 802.11 wireless frames.

Eb/N0: Bit Energy-to-Noise Density

Bit Energy-to-Noise Density (Eb/N0) is the ratio of bit energy to noise density. This value is used to specify the lower limit of operation in most digital communications systems and is also used to measure radio channel performance.

EDACS: Enhanced Digital Access Communica

Enhanced Digital Access Communication System (EDACS) is a radio communications protocol and product family invented in the General Electric Corporation, in the mid-1980s. EDACS was developed in competition with Motorola's Smartnet trunking system. It claimed, and continues to hold, significant market shares.

EDGE: Enhanced Data rates for GSM Evolut

Enhanced Data Rates for Global Evolution (EDGE), also known as Enhanced GPRS (EGPRS), is a digital mobile phone technology which acts as a bolt-on enhancement to 2G and 2.5G General Packet Radio Service (GPRS) networks. This technology works in GSM networks. EDGE is a superset to GPRS and can function on any network with GPRS deployed on it, provided the carrier implements the necessary upgrades. EDGE uses the same spectrum allocated for GSM900, GSM1800 and GSM1900 operations.

EESM: Exponential Effective SIR Mapping

Exponential Effective SIR Mapping (EESM) is a method to estimate demodulator performance in a channel with frequency selective signal and/or noise. In a sense, the EESM is a channel-dependent function that maps power level and MCS level to SINR values in the Additive White Gaussian Noise (AWGN) channel domain. This allows using this mapping along with AWGN assumptions (such as effect of an increase in power, CINR/MCS threshold tables) in order to predict the effect of MCS and boosting modification. The EESM method has been shown to yield an accurate estimation of the AWGN-equivalent SINR for frequency selective channels.

EFR: Enhanced Full Rate

Enhanced Full Rate is a voice coding algorithm applied in PCS-1900 systems (and now in GSM-900 as well, first system installed in Hong Kong).

EGPRS: Enhanced General Packet Radio Ser

Enhanced General Packet Radio Service (EGPRS), also known as Enhanced Data Rates for Global Evolution (EDGE), is a digital mobile phone technology. As an enhancement to GPRS, EGPRS improves spectral efficiency and data rates by adding new modulation and coding schemes. EGPRS uses the modulation technique 8PSK (8 Phase Shift Keying) to increase the achievable user data rate.

EHF: Extremely High Frequency

Extremely High Frequency (EHF) is the RF spectrum between 30 GHz and 300 GHz.

EIA: Electronic Industry Association

Electronic Industry Association (EIA) is a trade association and standards setting organization in the USA.

EIR: Equipment Identity Register

Equipment Identity Register (EIR) is a database used by GSM and other second generation wireless systems used to identify the customer devices permitted to access the network. A device is usually placed in the EIR once its operation has been certified for the infrastructure in a laboratory or validation facility.

EIRP: Effective Isotropic Radiated Power

Effective Isotropic Radiated Power (EIRP), also known as Equivalent Isotropically Radiated Power, is the amount of power that would have to be emitted by an isotropic antenna (that evenly distributes power in all directions and is a theoretical construct) to produce the peak power density observed in the direction of maximum antenna gain. EIRP can take into account the losses in transmission line and connectors and includes the gain of the antenna. The EIRP is often stated in terms of decibels over a reference power level, that would be the power emitted by an isotropic radiator with an equivalent signal strength. The EIRP allows making comparisons between different emitters regardless of type, size or form. From the EIRP, and with knowledge of a real antenna's gain, it is possible to calculate real power and field strength values.

Electromagnetic Spectrum

Electromagnetic Spectrum refers to the full range of electromagnetic frequencies, which include Radio Frequency (RF).

EMC: Electro Magnetic Compatibility

Electro Magnetic Compatibility (EMC) is the ability of different items of electrical equipment to work together without suffering the effects of interference. Equipment should operate without interfering with broadcast and communications signals and be immune to normal levels of such signals. For a given environment, e.g. on the factory floor, EMC implies that equipment should not generate unacceptable levels of interference which affect the performance of other products designed to operate in an industrial environment. Also, equipment should have sufficient immunity to electrical interference, such that the equipment continues to operate in an acceptable manner.

EMI: Electromagnetic Interference

Electromagnetic Interference (EMI) is the interference by electromagnetic signals that can cause reduced data integrity and increased error rates on transmission channels.

EMS: Enhanced Messaging Service

Enhanced Messaging Service (EMS) utilizes SMS but adds the ability to incorporate simple graphics, pictures, animations and sound. With this, the user can add an actual emotion to his/her message. Give someone a full birthday wish (with the text, the actual song, and a graphic of a birthday cake).


Encoder is a converter used to create a specific addressed message.


EPOC, now called Symbian OS, is an operating system optimized for mobile phone/PDA uses. It was developed by Symbian which is a joint company of Psion, Nokia, Ericsson, Motorola and Matsushita (Panasonic). EPOC turns voice-oriented handsets into Mediaphones and Wireless Information Devices. EPOC places a lighter load on the processor compared to present PDA operating systems and thus has the capacity to enhance the multimedia capacity of mobile phones.


Equalization is a technique used to compensate for communications channel distortions. This technique is often used in the mobile wireless communications.

ERMES: European radio messaging system

European radio messaging system is a paging system used in Europe and other parts of the world.

Error correction

Error correction is the process of correcting errors in data transmitted over a radio channel using forward error correction (FEC) techniques.

Error distribution

Error distribution describes how errors in a communications channel are distributed. Typical distributions are Gaussian (random) and Raleigh (bursty).

Error probability

Error probability is a computation of the likelihood of an error involving the Probability Density Function (PDF).

Error vector

The error vector is the vector difference between a reference signal and a measured signal and is a complex quantity containing a magnitude and phase component.

ertPS: Extended Real-Time Polling Servic

Extended Real-Time Polling Service (ertPS) is one of the five QOS service types defined in the IEEE 802.16 WiMAX. The 802.16 protocol supports five types of QoS — UGS (Unsolicited grant service), rtPS (Real time polling Service), ertPS (Extended Real-time POLLING SERVICE), nrtPS (Non-real-time polling service and BE (Best effort service). ertPS is a scheduling mechanism that builds on the efficiency of both UGS and rtPS. The ertPS is designed for realtime traffic with variable data rate (such as VOIP service with silence suppression) over the WiMAX network.

ESMR: enhanced specialized mobile radio

Enhanced specialized mobile radio (ESMR) is a digital SMR network, which provides dispatch, voice, messaging and data services.

ESN: Electronic Serial Number

Electronic Serial Number (ESN) is a unique unchangeable number that is built into the mobile phone and is transmitted by the phone as a means of identifying itself within the system. Each mobile phone is assigned a unique ESN.

ESS: Extended Service Set

Extended Service Set (ESS) is a set of two or more BSSes working together to form a single network.

ESSID: Extended Service Set Identifier

Extended Service Set ID (ESSID) is the identifying name of a wireless network — strictly, it is the identifying name of a wireless access point. It allows one wireless network to be clearly distinguishable from another. ESSID is one type of SSID (the other being BSSID).

ETACS: Extended Total Access Communicati

Extended Total Access Communications System (ETACS or E-TAGS) is the analog mobile phone network developed in the UK and available in Europe and Asia. ETAGS is the Extension of TACS through the allocation of additional radio channels.

ETSI: European Telecommunications Standa

European Telecommunications Standard Institute (ETSI) is an independent, non-profit organization, whose mission is to produce telecommunications standards for today and for the future. Based in France, ETSI is officially responsible for standardization of Information and Communication Technologies (ICT) within Europe. These technologies include telecommunications, broadcasting and related areas such as intelligent transportation and medical electronics.

EV-DV: EVolution for Data and Voice

EVolution for Data and Voice (EV-DV, EVDV or 1xEV-DV) is the technology that provides integrated voice and simultaneous high-speed packet data multimedia services at high speeds. 1xEV-DV is backward compatible to IS-95A/B and CDMA2000 1X and enables a simple migration to 1xEV-DV from 1X networks while preserving existing services offered by operators, including voice and data services on the same carrier, and simultaneous voice and data.

EVDO: Evolution Data Only/Evolution Data

Evolution Data Only/Evolution Data Optimized (EVDO or 1xEV-DO) is a high-speed network protocol used for wireless Internet data communications. The EVDO protocol supports asymmetric communications, allocating a majority of this bandwidth to downloads. EVDO is based on the 1xRTT standard, providing data transmission speeds wirelessly up to 3.1Mbps. It is for always-on mobile packet data and voice for GPRS-enabled cellular phones, networks and handheld devices.

EVM: Error Vector Magnitude

Error Vector Magnitude (EVM) is a modulation quality metric widely used in digital RF communications systems. It is the root-mean-square (rms) value of the error vector over time at the instants of symbol clock transitions. Used properly, EVM and related measurements can pinpoint exactly the type of degradations present in a signal and can even help identify their sources.

Eye diagram

Eye diagram is a superposition of segments of a received PAM signal displayed on an oscilloscope or similar instrument. The eye diagram is used to assess impairments in the radio channel.

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