Common terms & acronyms used in wireless industry

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C-RAN - Centralized Radio Access Network -  A radio access network (RAN) architecture that separates baseband functions from antennas and remote radio heads (RRH) and pools baseband functions in centralized baseband units (BBU). A competing architecture to multi-access edge computing (MEC).
Carrier Aggregation -  A major feature introduced with LTE-Advanced, enabling mobile network operators to combine multiple carriers in fragmented spectrum bands to increase peak user data rates and overall capacity of the network.
CATR - Compact Antenna Test Range -  Equipment for testing of antennas at frequencies when difficult to obtain far-field spacing. The CATR uses the 3GPP-approved indirect far-field (IFF) test method to overcome the path loss and excessive far-field distance issues associated with 5G cellular communications.
CDMA - Code Division Multiple Access -  The CDMA air interface is used in both 2G and 3G networks. It's a "spread spectrum" technology, allowing many users to occupy the same time and frequency allocations in a given band/space. (Source: www.cdg.org)
CE - Channel Emulator -  Electronic equipment that enables real-time performance testing of wireless devices and base stations. Channel emulators simulate the impairments of real-world radio channel conditions to validate the performance of base stations, chipsets, and devices.
Cell Tower -  Physical location of electronic communications equipment, including antennas to support cellular communication in a network.
CIR - Channel Impulse Response -  The correlation of the received signal against the transmitted signal during testing.
CoMP - Coordinated Multipoint -  A technique where multiple base stations can coordinate downlink transmission (from base station (BS) to user equipment (UE)) and uplink transmission (UE to BS) to improve the overall reliability and performance.
Control Plane -  The part of a network that carries information that establishes and controls the network. It controls the flow of user information packets between network interfaces.
Core Network -  The part of the network that provides services to mobile subscribers through the radio access network (RAN). It is also the gateway to other networks, for instance to the public- switched telephone network or public clouds.
COW - Cell on Wheels -  A mobile cell site designed to increase existing cellular capacity during a large event like an outdoor concert
CP-OFDM - Cyclic Prefix Orthogonal Frequency Division Multiplexing -  An orthogonal frequency division multiplexing (OFDM) technique that uses cyclic prefixes (CP) instead of null guards, protecting OFDM signals from intersymbol interference (ISI).
CPE - Common Phase Error -  A measurement of noise in orthogonal frequency division multiplexing (OFDM). CPE describes the average of the phase noise sequence spanning an OFDM symbol.
CPRI - Common Public Radio Interface -  An interface specification standard that defines a layer-1 and layer-2 interface for connecting radio equipment such as radio heads on towers to other radio equipment control infrastructure located at the base of the tower or in a centralized facility.
CRS - Cell-Specific Reference Signal -  A signal transmitted to estimate the channel between the base station and the user equipment as a reference point for downlink power.
CSI - Channel State Information -  Refers to known properties of a communication link. 5G NR specifies a new beam management framework for CSI acquisition to reduce coupling between measurements and reporting to control different beams dynamically.
CUPS - Control User Plane Separation -  Foundational concept for 5G networks that enables operators to independently scale the control plane and user plane of the mobile network as needed.
CWDM - Coarse Wave Division Multiplexing -  An optical technology that typically allows up to eight separate signals over a single strand of fiber optic cable using different wavelengths. This technology is useful in linking DAS Head-Ends with a BTS hotel location




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