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There are 63 names in this directory beginning with the letter M.
m-law companding

M-law companding is a type of non-linear (logarithmic) quantizing, companding and encoding techniques for speech signals based on the m-law. This type of companding uses a m factor of 255 and is optimized to provide a good signal-to-quantizing noise ratio over a wide dynamic range.

MAC address

MAC address (Media Access Control address) is the address associated with every hardware device on the network. Every wireless 802.11 device has its own specific MAC address hard-coded into it. This unique identifier can be used to provide security for wireless networks. When a network uses a MAC table, only the 802.11 radios that have had their MAC addresses added to that network's MAC table are able to get onto the network.


MACRO Cell, also known as macrocell, is a large cell in a wireless system capable of covering a large physical area. Macrocells are used in rural areas and other areas where subscriber or traffic densities are low.

MAHO: Mobile Assisted Handoff

Mobile Assisted Handoff (MAHO) is a handoff technique involving feedback from the mobile station as part of the handoff process. The feedback is usually in the form of signal level and quality measurements on the downlink and signal level measurements from neighbor cells.

MAI: Multiple Access Interference

Multiple Access Interference (MAI) is a type of interference caused by multiple cellular users who are using the same frequency allocation at the same time. In both 2G and 3G moble networking, each user is then given a pair of frequencies (uplink and downlink) and a time slot during a frame. Different users can use the same frequency in the same cell except that they must transmit at different times. This multiple-access interference can present a significant problem if the power level of the desired signal is significantly lower (due to distance) than the power level of the interfering user.

MANET: Mobile Ad Hoc Network

Mobile Ad Hoc Network (MANET) refers to a type of mobile network in which each node has the ability to act as a router, permitting adaptable multihop communications. The establishment and maintenance of these routes, however, is severely affected by the stochastic nature of wireless communications, making it diffcult to implement such nets in practice.

MAP: Mobile Application Part

The Mobile Application Part (MAP), one of the protocols in the SS7 suite, allows for the implementation of the mobile network (GSM) signaling infrastructure. The premise behind MAP is to connect the distributed switching elements, called mobile switching centers (MSCs), with a master database, called the Home Location Register (HLR). The HLR dynamically stores the current location and profile of a mobile network subscriber. The HLR is consulted during the processing of an incoming call.

Master Access Point

Master Access Point is the primary access point in a wireless network that uses WDS to extend range. The master access point shares the Internet connection with the rest of the remote, or relay access points, along with all the wireless clients.

Matched filter

Matched filter is the receiver filter with impulse response equal to the timereversed,complex conjugate impulse response of the combined transmitter filter-channel impulse response.

MBMS: Multimedia Broadcast Multicast Ser

Multimedia Broadcast Multicast Service (MBMS) is a broadcasting service that can be offered via existing GSM and UMTS cellular networks. The infrastructure offers an option to use an uplink channel for interaction between the service and the user, which is not a straightforward issue in usual broadcast networks, as for example conventional digital television is only a one-way (unidirectional) system. MBMS uses multicast distribution in the core network instead of point-to-point links for each end device.

MBOA: MultiBand OFDM Alliance

MultiBand OFDM Alliance (MBOA) was an industrial association with a focus on the Ultra WideBand wireless communication technologies. The Multi-Band OFDM Alliance and the WiMedia Alliance were merged in 2005, under the name or WiMedia Alliance to align goals more fully.

MBS: Mobile Broadband Systems

Mobile Broadband Systems (MBS) are extensions of the wired B-ISDN system. MBS provides radio coverage restricted to a small area (e.g. sports arena, factory, television studio) and supports communications between MBS mobile terminals and terminals directly connected to the B-ISDN at up to 155 Mbit/s.

MBWA: Mobile Broadband Wireless Access

Mobile Broadband Wireless Access (MBWA), nicknamed as Mobile-Fi, is an IEEE standard defined by the 802.20 group to define the interface that allows the creation of low-cost, always-on, and truly mobile broadband wireless networks. The scope of the MBWA standard consists of the physical (PHY), medium access control (MAC), and logical link control (LLC) layers. The air interface will operate in bands below 3.5 GHz and with a peak data rate of over 1 Mbit/s.


MC-CDMA, also called CDMA2000, typically means the combination of three IS-95 carriers to form one wideband carrier. It is an evolution of IS-95 for third generation systems.

MCD: Mobile Computing Device

Mobile Computing Devices (MCD) are the computer devices such as notebook that can access to the network through mobile access.

Mcps: Mega Chips Per Second

Mega Chips Per Second (Mcps) is a measure of the number of bits (chips) per second in the spreading sequence of direct sequence spreading code.

MDA: Microconnect Distributed Antennae

Microconnect Distributed Antennae (MDA) are small-cell local area (200–300 metre range) transmitter-receivers usually fitted to lampposts and other street furniture in order to provide Wireless LAN, GSM and GPRS connectivity. They are therefore less obtrusive than the usual masts and antennae used for these purposes and meet with less public opposition. Each antenna point contains a 63-65 GHz wireless unit alongside a large memory store providing proxy and cache services.

MDSS: Mobile Data Synchronization Servic

Mobile Data Synchronization Service (MDSS) is the ability to synchronize data on client devices with data stored in an enterprise database. A common protocol has been developed that will eventually allow a variety of clients to synchronize with a variety of databases.

MED: Message Entry Device

Message Entry Device (MED) is a device which sends information into a paging network using TDP. This may be any type of device from a hand-held type of unit to a host computer.

MexE: Mobile Station Application Executi

Mobile Station Application Execution Environment (MexE) is a framework to ensure a predictable environment for third-party applications in GSM or UMTS handsets. MExE does this by defining different technology requirements called “classmarks.” MExE classmark 1 is based on WAP, classmark 2 on PersonalJava and JavaPhone, and classmark 3 on J2ME CLDC and MIDP. Other classmarks may be defined in the future. MExE specifies additional requirements for all classmarks, for instance, a security environment, capability and content negotiation, a user profile, user interface personalization, management of services and virtual home environment. A handset can support multiple classmarks.

MFN: Multi-Frequency Network

A Multi-Frequency Network (MFN) is a type of radio network that operates several transmitters on a number of different frequencies.

MGCF: Media Gateway Control Function

Media Gateway Control Function (MGCF), a component in the IP Multimedia Subsystem (IMS), communicates with the Call Session Control Function (CSCF) and controls the connections for media channels in an IMS-MGW. It performs protocol conversion between ISDN User Part (ISUP) and the IMS call-control protocols.

MHS: Message Handling System

Message Handling System (MHS) is a general-purpose system used for receiving, storing, and sending messages with a consistent set of protocols to connect to external devices.

MHz: Megahertz

MHz or Megahertz, in which one MHz is equal to one million Hertz, is a measurement of frequency.


Microbrowser is a modified Web browser that allows users to get Internet data on a handheld wireless device


Microcell is a very small cell used in densely populated areas where traffic volume is high. There is no official definition of what cell radius distinguishes a small cell from a microcell.


Microwave is the electromagnetic waves in the frequency range of 1 to 30 GHz. Microwave-based networks are an evolving technology gaining favor due to high bandwidth and relatively low cost.

MIDP: Mobile Information Device Profile

Mobile Information Device Profile (MIDP) is a set of Java APIs that is generally implemented on the Connected Limited Device Configuration (CLDC). It provides a basic J2ME application runtime environment targeted at mobile information devices, such as mobile phones and two-way pagers. The MIDP specification addresses such issues as user interface, persistent storage, networking, and application model

MIMO: Multiple Input Multiple Output

Multiple Input Multiple Output (MIMO) refers to using multiple antennas in a Wi-Fi device to improve performance and throughput. The MIMO technology takes advantage of a characteristic called multipath, which occurs when a radio transmission starts out at point A and then reflects off or passes through surfaces or objects before arriving, via multiple paths, at point B. MIMO technology uses multiple antennas to collect and organize signals arriving via these paths. The technology is included the 802.11n standard.

MIN: Mobile Identification Number

Mobile Identification Number (MIN) is a unique identification number given to a mobile unit. In most cases, this number is the telephone number of the handset. In the case of analog cellular, the MIN is used to route the call. In most second generation system, the system assigns temporary numbers to the handset to route calls as a security precaution. See also TMSI.

MISO: Multiple Input, Single Output

Multiple Input Single Output (MISO) is a smart antenna technology that uses multiple transmitters and a single receiver on a wireless device to improve the transmission distance. MISO technology can be applied in areas such as Digital TeleVision (DTV), Wireless Local Area Networks (WLANs), Metropolitan Area Networks (MANs), and mobile communications. The implementation of MISO would include multiple antennas at the source, or transmitter, and the destination, or receiver, has only one antenna — the antennas are combined to minimize errors and optimize data speed. Other forms of smart antenna technology include Multiple Input Multiple Output (MIMO) and Single Input Multiple Output (SIMO).

MLD: Maximum Likelyhood Detection

Maximum Likelyhood Detection (MLD) is an optimal scheme for detecting the spatially multiplexed signals in a mobile network.

MMDS: Multichannel Multipoint Distributi

Multichannel multipoint distribution service (MMDS), also known wireless cable, is a wireless telecommunications technology, used for general-purpose broadband networkings or, more commonly, as an alternative method of cable television programming reception. MMDS is used usually in sparsely populated rural areas, where laying cables is not economically viable. The MMDS band uses microwave frequencies from 2 GHz to 3 GHz in range. Reception of MMDS-delivered television signals is done with a special rooftop microwave antenna and a set-top box for the television receiving the signals. The receiver box is very similar in appearance to an analog cable television receiver box.

MMM: Mobile Media Mode

Mobile Media Mode (MMM, also marked as WWW:MMM), is a marketing icon comprising a unifying industry-wide marketing symbol representing web-based mobile products and services.

MMR-BS: MMR Base Station

Mobile Multihop Relay Base Station (MMR-BS) refers to a base station that is compliant with amendments IEEE 802.16j through IEEE 802.16e-2005, which has extended functionality to support MMR as defined in 802.16j. An MMR-BS is fully compliant with IEEE Standard 802.16e-2005 and has been enhanced by amendment IEEE 802.16j to support mobile multihop relay. Mobile multihop relay is supported only for the OFDMA mode of IEEE Standard 802.16e-2005. Relay stations that support a particular MMR-BS are managed by that MMR-BS.

MMR: Mobile Multihop Relay

Mobile Multihop Relay (MMR) refers to the concept of relaying user data and possibly control information between an MMR base station and an IEEE Standard 802.16 compliant mobile station through one or more relay stations. Licensed spectrum is used for relay. The purpose of enabling relay is to enhance coverage, range, and throughput and possibly capacity of an MMR–BS and to enable very low power devices to participate in the network. The adjective “mobile” used here refers to the fact that both mobile subscriber stations and mobile relay stations are supported. It is possible to establish multiple communications paths between the MMR-BS and an MS and to communicate the same user data and/or control/management information through both paths to improve communications reliability.

MMS: Multimedia Messaging Service

Multimedia Messaging Service (MMS) allows users to send messages containing text, pictures, sounds, and other rich media between cell phones.

MMSE: Minimum Mean Squared Error

Minimum mean-square error (MMSE) relates to an estimator having estimates with the minimum mean squared error possible. MMSE estimators are commonly described as optimal.

Mobile Data service

Mobile data service is a personal communications service that is expected to provide two-way wireless communication of text, voice messages, and potentially video messages among computers, personal digital assistants, and databases. Mobile data services can be provided by a number of technologies such as cellular, Personal Telecommunications Services, mobile satellite, and Enhanced Specialized Mobile Radio, as well as networks.

Mobile IP

Mobile IP is the key protocol to enable mobile computing and networking, which brings together two of the world's most powerful technologies — the Internet and mobile communication. In Mobile IP, two IP addresses are provided for each computer: home IP address which is fixed and care-of IP address which is changing as the computer moves. When the mobile moves to a new location, it must send its new address to an agent at home so that the agent can tunnel all communications to its new address timely.

Mobile phone network

Mobile phone network is a network of cells. Each cell is served by a radio base station from where calls are forwarded to and received from your mobile phone by wireless radio signals.

Mobile Satellite

Mobile Satellite is a personal communications service that is anticipated to provide two-way voice and data communications using satellites, handheld phones, and wireless modems incorporated into devices such as notebook computers. It is expected that Mobile Satellite services will offer enhanced features such as call waiting and voice mail. Geographic service coverage is anticipated to be larger than most PCS services and may be worldwide.

Mobile WiMAX

Mobile WiMax refers to the technologies defined in the IEEE 802.16e (formally known as 802.16-2005), which addresses mobility of wireless broadband (WiMax). 802.16e, based on an existing WiMax standard 802.16a, adds WiMax mobility in the 2 to 6 GHz licensed bands. provides an improvement on the modulation schemes stipulated in the original (fixed) WiMAX standard. Mobile WiMax allows for fixed wireless and mobile Non Line of Sight (NLOS) applications primarily by enhancing the OFDMA (Orthogonal Frequency Division Multiple Access).


Modulate refers to varying the amplitude, frequency or phase of a radio signal in order to transmit information.


Modulation refers to carring information on a signal by varying one or more of the signal's basic characteristics — frequency, amplitude and phase. Different modulation carries the information as the change from the immediately preceding state rather than the absolute state.

MOS: Mean Opinion Score

Mean Opinion Score (MOS) is a statistical rating and scoring technique used to rate the performance of telephone connections by users.

MPE: Multi-Pulse Excited

Multi-Pulse Excited (MPE) is a multi-pulse process for determining the position and amplitude of sample pulses in a speech codec.

MRFC: Multimedia Resource Function Contr

Multimedia Resource Function Controller (MRFC), a component in the IP Multimedia Subsystem (IMS), is the element responsible for taking SIP requests from the Application Server (AS) and translating them to messages that control the media processing resources residing in the Multimedia Resource Function Processor (MRFP).

MRFP: Multimedia Resource Function Proce

Multimedia Resource Function Processor (MRFP) is a component in the IP Multimedia Subsystem (IMS). The mixing of the various conference participants’ media streams is performed by the MRF (Media Resource Function) which comprises of the MRFC (Media Resource Function Controller) and the MRFP (Media Resource Function Processor). MRFP is where the actual media processing resources reside.

MRS: Mobile Relay Station

Mobile Relay Station (MRS), a concept in the mobile WiMAX network, is a relay station that is intended to function while in motion. MRS mobility is constrained by the same limits as an Mobile Staton (MS) in IEEE Std 802.16e-2005. An MRS may be installed in a bus or train for use by IEEE Std 802.16-2005 subscribers.

MS: Mobile Station

Mobile Station refers to the customer terminal including hardware and software in a wireless network.

MSA: Metropolitan Statistical Area

Metropolitan Statistical Area (MSA) is a geographic area over which a cellular operator is licensed to provide service. MSAs are groups of counties in metropolitan areas having common financial, commercial and economic ties and were first used to license cellular service in the early '80s. MSAs cross state lines in some instances. MSAs were first used by the Dept.of Commerce to collect economic data.

MSB: Most Significant Bit

Most Significant Bit (MSB), in a binary coding scheme, is the bit having the greatest numerical value. Analogous to the left-most numeric position in a decimal number.

MSC: Mobile Switching Center Mobile Sw

(MSC) is the place that provides telephony switching services and controls calls between telephone and data systems. The MSC switches all calls between the mobile and the PSTN and other mobiles.

MSEI: International Mobile Station Equip

IInternational Mobile Station Equipment Identity (IMSEI) is an identification number assigned to GSM mobile stations that uniquely identifies each one. It is a 15-digit serial number that contains a type approval code, final assembly code and serial number.

MSISDN: Mobile Station Integrated Servic

Mobile Station Integrated Services Digital Number (MSISDN), the mobile equivalent of ISDN, refers to the 15-digit number that is used to refer to a particular mobile station. The ITU-T recommendation E.164 defines the international numbering plan that MSISDN is based on. The acronym MSISDN has a number of different expansions when used to refer to the value: Mobile Subscriber ISDN Number, Mobile Station International Subscriber Directory Number, Mobile Station ISDN Number, amongst other variants.

MSK: Minimum Shift Keying

Minimum Shift Keying (MSK) is a modulation technique using sinusoidal shaped input data pulses to drive the phase modulator. This results in a linear phase change over conventional QPSK, resulting in lower side lobes and less adjacent channel interference performance.

MSO: Multi-Services Operator

Multi-Services Operator (MSO) is a service provider which provides multiple services such as voice (mobile and fixed line), data and vedio.

MTA: Message Transfer Agent

Message Transfer Agent (MTA) is the portion of a Message Handling System (MHS) that deals with moving messages within the Message Handling System (MHS).

MTSO: Mobile Telephone Switching Office

Mobile Telephone Switching Office (MTSO), a computer or a switch, is the brains of a cellular system. The MTSO assigns frequencies to each call, reassigns frequencies for hand-offs, interconnects calls with the local and long distance landline telephone companies, compiles billing information, etc. Every cellular system has one or more MTSOs or switches.

Multichannel Multipoint Distribution Ser

Multichannel multipoint distribution service is a broadcasting and communications service that operates in the ultra-high frequency (UHF) portion of the radio spectrum between 2.1 and 2.7 GHz. Multichannel multipoint distribution service is also known as wireless cable. It was conceived as a substitute for conventional cable television (TV). However, it also has applications in telephone/fax and data communications.


Multipath is a propagation phenomenon characterized by the arrival of multiple versions of the same signal from different locations shifted in time due to having taken different transmission paths of varying lengths.

Multiple access

Multiple access is the process of allowing multiple radio links or users to address the same radio channel on a coordinated basis. Typical multiple access technologies include FDMA, TDMA, CDMA, and FHMA.

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