28.3103GPPEnergy efficiency of 5GManagement and orchestrationRelease 18TS
For the purposes of the present document, the terms given in 3GPP TR 21.905  and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in 3GPP TR 21.905 .
Candidate cell: cell which can provide coverage when the original cell goes into energySaving state.
energySaving state: state in which some functions of a cell or network function are powered-down.
Note 1: In energySaving state, the cell or network function is still controllable.
Note 2: This is the state when the traffic goes below a certain threshold.
notEnergySaving state: state when no energy saving in progress.
Note 3: This is the state when the traffic goes above a certain threshold.
ES activation: procedure to power down a cell or network function for energy saving purposes.
Note 4: As a result, the subject cell or network function goes into energySaving state.
ES deactivation: procedure to power up a cell or network function.
Note 5: As a result, the subject cell or network function goes into notEnergySaving state.
ES Probing procedure: procedure executed by an ES probing capable cell triggered by Cell Activation procedure or ES deactivation procedure.
NOTE 6: The ES probing procedure  assists the decision whether the cell will transfer to notEnergySaving state or remain in energySaving state.
Note 7: During the ES probing procedure the ES probing capable cell is not carrying traffic, while it can perform measurements and be visible to the UEs in its coverage.
compensatingForEnergySaving state: in an off-peak traffic situation, a cell is remaining powered on, e.g. taking over the coverage areas of neighbor cell in energySaving state..
ES compensation: the procedure to change a cell’s configuration to remain powered on for compensating energy saving activation on other cells, e.g. by increasing a cell’s coverage area. As a result, the cell is in compensatingForEnergySaving state.
For the purposes of the present document, the abbreviations given in 3GPP TR 21.905  and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in 3GPP TR 21.905 .
DV Data Volume
EC Energy Consumption
EE Energy Efficiency
PEE Power, Energy and Environmental
PNF Physical Network Function
VNF Virtualized Network Function