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There are 24 names in this directory beginning with the letter L.
L2CAP: Logical Link Control and Adaptati

Logical Link Control and Adaptation Protocol, typically short as L2CAP, is used within the Bluetooth protocol stack at the data link layer. It passes packets to either the Host Controller Interface (HCI) or on a hostless system, directly to the Link Manager.

LAI: Location Area Identity

Location Area Identity (LAI) is the information carried in the SIM of GSM handsets that identify the subscriber's home area. This is used for billing and sub-net operation purposes.

LASCDMA: Large Area Synchronized Code Di

Large Area Synchronized Code Division Multiple Access (LASCDMA) is a technology developed by LinkAir that offers a higher spectral efficiency and moving speed for better mobile-application support.Also, its asymmetric traffic, higher throughput, and smaller delay provide improved IP support. Currently, LAS-CDMA is being considered as phase 2 of the 1xEV standards. A LAS-CDMA TDD variant is compatible with systems such as TD-SCDMA.

LDPC code: Low-Density-Parity-Check code

A low-density parity-check code (LDPC code) is an error-correcting code and a method of transmitting a message over a noisy transmission channel. While LDPC and other error correcting codes cannot guarantee perfect transmission, the probability of lost information can be made as small as desired. LDPC was the first code to allow data transmission rates close to the theoretical maximum, the Shannon Limit.

LEAP: Lightweight Extensible Authenticat

Lightweight Extensible Authentication Protocol (LEAP), also known as Cisco-Wireless EAP, is a Cisco security technology that builds on Wi-Fi's WEP encryption. Basically, it changes the WEP key dynamically during a session to make it less likely that a snooper will be able to derive the key. LEAP provides username/password-based authentication between a wireless client and a RADIUS server like Cisco ACS or Interlink AAA. LEAP is one of several protocols used with the IEEE 802.1X standard for LAN port access control.

Lee's model

Lee's model is a slope-intercept propagation prediction model developed at Bell Laboratories and popularized by William Lee. The model assumes an initial condition at a short distance from a base station and uses that as one end of a slope intercept model to predict path loss between a base station and a mobile unit.

LEO: Low Earth Orbit

Low Earth Orbit (LEO) is the orbit between 700 and 2,000 kilometers above the Earth for Mobile communications satellite.

Link budget

Link budget is a calculation involving the gain and loss factors associated with the antennas, transmitters, transmission lines and propagation environment used to determine the maximum distance at which a transmitter and receiver can successfully operate.

LMDS: Local Multipoint Distribution Syst

Local multipoint distribution system (LMDS) is the broadband wireless technology used to deliver voice, data, Internet, and video services in the 25-GHz and higher spectrum (depending on licensing). As a result of the propagation characteristics of signals in this frequency range, LMDS systems use a cellular-like network architecture though services provided are fixed, not mobile. In the United States, 1.3 MHz of bandwidth (27.5 B 28.35 GHz, 29.1 B 29.25 GHz, 31.075 B 31.225 GHz, 31 B 31.075 GHz, and 31.225 B 31.3 GHz) has been allocated for LMDS to deliver broadband services in a point-to-point or point-to-multipoint configuration to residential and commercial customers. This tutorial details the underlying technology inherent in offering voice, data, Internet, and video services over LMDS through integration with the wireline environment.

LMP: Link Manager Protocol

Link Manager Protocol (LMP) is a data link layer protocol in the Bluetooth protocol stack. LMP carries out link setup, authentication, link configuration and other protocols. It discovers other remote Link Manager (LM) and communicates with them via the Link Manager Protocol (LMP). To perform its service provider role, the LM uses the services of the underlying Link Controller (LC).

LNA: Low Noise Amplifier

Low Noise Amplifier (LNA) is a receiving preamplifier having very low internal noise characteristics placed very near the antenna of a receiver to capture the C/N before it can be further degraded by noise in the receiving system.

LNP: Local Number Portability

Local Number Portability (LNP) is the capability that allows wireless customers to switch carriers but retain the same phone number. Wireless portability is expected to become a reality by the end of 2003.

Location registration

Location registration is one of several computer databases used to maintain location and other information on mobile subscribers. See HLR and VLR.

Location Server

Location Server allows end users to connect real-time location information from mobile service operator with mapping and routing information. Location server enables mobile service providers to provide their end-users with personalized contents that are location-dependent.

Logic Channel

Logic Channel is a communications channel derived from a physical channel. A physical channel, i.e. RF channel, typically carries a data stream that contains several logical channels. These usually include multiple control and traffic channels.

LOS: Line of Sight

Line of Sight (LOS) describes an unobstructed radio path or link between the transmitting and receiving antennas of a communications system. The opposite to LOS is NLOS, or Non Line of Sight.

LOS: Loss of Signal

Loss of signal (LOS) is a condition where the received signal drops below threshold due to a terrain obstruction or other phenomenon increasing the link budget loss beyond design parameters.

LPA: Linear Power Amplifier

Linear Power Amplifier (LPA) is the final amplification stage in a multicarrier transmitter that has been designed and optimized to produce a linear response. By operating in the linear mode, the amplifier reduces the non-linear effects that produce intermodulation products and side-lobe spectra that cause adjacent channel interference.

LPC: Linear Predictive Coding

Linear Predictive Coding (LPC) is a speech encoding scheme that uses periodic pulses to excite a filter, similar to the way human voice is produced.The code is predictive in that it uses knowledge of past data (represented as vectors) to predict future values in a feed forward manner.

LSB: Least Significant Bit

Least Significant Bit (LSB), in a binary coding scheme, is the bit having the least numerical value. Analogous to the units position in a decimal number.

LTE: Long Term Evolution

Long Term Evolution (LTE), sometimes also referred to as 3G LTE or Super-3G, is the 3GPP radio technology evolution architecture. Its full name is UTRA-UTRAN Long Term Evolution (LTE) and 3GPP System Architecture Evolution (SAE).


Lu is one of four interfaces connecting the UTRAN internally or externally to other functional entities. The other three are Uu, lub and lur. The lu interface is an external interface that connects the RNC to the Core Network (CN). Lu is the standardized interface between a Radio Network Controller Network and Packet Subsystem (e.g. RNC-3GSGSN).


Lub is one of four interfaces connecting the UTRAN internally or externally to other functional entities. The other three are Uu, lu and lur. The lub is an internal interface connecting the RNC with the Node B. And at last there is the lur interface which is an internal interface most of the time, but can, exceptionally be an external interface too for some network architectures. Lub is the interface between a Base Station and Radio NetworkController.


Lur is one of four interfaces connecting the UTRAN internally or externally to other functional entities. The other three are lu, Uu, and lub. The lur interface which is an internal interface most of the time, but can, exceptionally be an external interface for some network architectures, too. The lur connects two RNCs with each other.

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