A27 Glossary

3GPP

The 3rd Generation Partnership Project prepares, approves and maintains globally applicable technical specifications and technical reports for the evolved 3rd generation and beyond mobile system known as UMTS and LTE/E-UTRA. 3GPP also maintains the technical specifications and technical reports for GSM, including GPRS and EDGE.

3GPP2

The 3rd Generation Partnership Project 2 for the North American and Asian interest.

ACIR

Adjacent Channel Interference Ratio is defined as the ratio of the power of an adjacent-channel interferer, to the power measured after a receive filter in the adjacent channel and is a result of both transmitter and receiver imperfections.

ACLR

Adjacent Channel Leakage (Power) Ratio. The ACLR of a signal is defined as the ratio of the signal’s power to the power of the signal when measured at the output of a (nominally rectangular) receiver filter centred on an adjacent frequency channel.

ACS

Adjacent Channel Selectivity (ACS) is a measurement of a receiver's ability to process a desired signal while rejecting a strong signal in an adjacent frequency channel. ACS is defined as the ratio of external interference to the interference appearing at a receiver input.

Active list

(CDMA module)

Different for each UE.  When a UE is dropped in the network, it connects to all the BS (i.e. 19 or 57). The connect procedure involves the calculation of the path loss. The UE sort all the connections by path loss so that the first item of the list is the one with the shortest path loss. In the CDMA module only two BSs which are within the handover margin can be added to the active list. In the OFDMA module, there is no limitation on the number of BSs

C

Desired (wanted) signal received by the Victim Link Receiver (VLR)

BS

Base Station of a  cellular system

CDMA

Code Division Multiple Access (CDMA) is a multiple access scheme for digital radio, to send voice, data, and signalling data between mobile phones and cell sites. CDMA channels are defined with codes and permit many simultaneous transmitters on the same frequency channel.

Coverage Radius

Radius of the coverage where receivers are distributed around the transmitter of the same link

e.i.r.p.

Effective isotropic 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

Interfering link:

Link that interferes with the Victim Link Receiver (VLR). It is composed by Interfering Link Transmitters (ILT) and Interfering Link Receivers (ILR)

Interfering link transmitter (ILT)

Transmitter within the considered Interfering Link

I

represents the interfering power received by the Victim link receiver

LTE

Long Term Evolution is the name given to a project within the Third Generation Partnership Project (3GPP) to enhance the Universal Mobile Telecommunications System (UMTS) mobile phone standard. The resulting E-UTRA (Evolved Universal Terrestrial Radio Access) radio interface is based on orthogonal frequency division multiple access (OFDMA) for the downlink and single carrier frequency division multiple access (SC-FDMA) for the uplink.

N

Noise floor 

OFDM

Orthogonal Frequency-Division Multiplexing (OFDM) is a digital multi-carrier modulation scheme, which uses a large number of closely-spaced orthogonal sub-carriers. Each sub-carrier is modulated with a conventional modulation scheme (such as quadrature amplitude modulation) at a low symbol rate, maintaining data rates similar to conventional single-carrier modulation schemes in the same bandwidth.

Optimal Capacity

(CDMA module)

The number of UEs per cell that a given CDMA network is able to serve under “ideal” conditions without any external interference

Simulation radius

Radius of the area where Interefering link transmitters (ILTs) are distributed around the Victim link receiver (VLR).

Victim link

Link containing transmitters (VLT) and receivers (VLR) of the system which is interfered with by Interfering Link Transmitters (ILT)

Victim link receiver (VLR)

Receiver within the considered Victim Link

Victim link transmitter (VLT)

Transmitter within the considered Victim Link