The document lists various counters related to carrier aggregation (CA) in LTE networks. The counters observe metrics such as the number of UEs using CA, physical resource blocks occupied by CA UEs, traffic volume and time for downlink transmissions to CA UEs, handover success rates for CA UEs, attempts and success rates for adding or removing secondary cells for CA, and traffic volume and duration on primary and secondary cells for CA UEs. Formulas are provided for calculating drop rates, success rates, and other metrics from the counter values.

1. Counter Name Description
 L.Traffic.User.PCell.DL.Max
 L.Traffic.User.PCell.DL.Avg
 L.Traffic.User.SCell.DL.Max
 L.Traffic.User.SCell.DL.Avg
Observe the number of UEs that are using CA.
 L.ChMeas.PRB.DL.PCell.Used.Avg
 L.ChMeas.PRB.DL.SCell.Used.Avg
Observe the number of PRBs occupied by CA UEs.
 L.Thrp.bits.DL.CAUser Observe the total traffic volume of dow nlinkPDCP service data units
(SDUs) transmitted to active CA UEs in the local cell.
 L.Thrp.Time.DL.CAUser Observe the total time period in w hich downlink PDCP SDUs are
transmitted to active CA UEs in the local cell.
 L.E-RAB.AbnormRel.CAUser
 L.E-RAB.NormRel.CAUser
Calculate the service drop rate of CA UEs by using the follow ing formula:
L.E-RAB.AbnormRel.CAUser/(L.E-RAB.AbnormRel.CAUser + L.E-
RAB.NormRel.CAUser) x 100%.
 L.HHO.ExecSuccOut.CAUser.PCC
 L.HHO.ExecAttOut.CAUser.PCC
 L.HHO.PrepAttOut.CAUser.PCC
Calculate the handover successrate of CA UEs by using the follow ing
formula:
L.HHO.ExecSuccOut.CAUser.PCC/L.HHO.ExecAttOut.CAUser.PCC x
100%.
 L.HHO.InterFddTdd.PrepAttOut.CA
User.PCC
 L.HHO.InterFddTdd.ExecAttOut.CA
User.PCC
 L.HHO.InterFddTdd.ExecSuccOut.C
AUser.PCC
Calculate the success rate of PCell handovers fromLTE FDD to LTE TDD
for CA UEs by using the follow ing formula:
L.HHO.InterFddTdd.ExecSuccOut.CAUser.PCC/L.HHO.InterFddTdd.Exec
AttOut.CAUser.PCC x 100%.
 L.CA.DLSCell.Add.Att
 L.CA.DLSCell.Add.Succ
 L.CA.DLSCell.Rmv.Att
 L.CA.DLSCell.Rmv.Succ
Observe the total number of attempts to add or remove SCells for CA UEs
in the monitored cell, and calculate the total success rate of adding or
removing SCells for CA UEs in the cell.
 L.CA.DLSCell.Add.Meas.Att
 L.CA.DLSCell.Add.Meas.Succ
 L.CA.DLSCell.Rmv.Meas.Att
 L.CA.DLSCell.Rmv.Meas.Succ
Observe the number of attempts to add or remove SCells for CA UEs
based on A4 or A2 measurements, respectively, in the monitored cell, and
calculate the successrate of such attempts in the cell.
 L.CA.DLSCell.Add.Blind.Att
 L.CA.DLSCell.Add.Blind.Succ
Observe the number of attempts to add SCells for CA UEs in a blind
manner in the monitored cell, and calculate the success rate of such
attempts in the cell.
 L.CA.DLSCell.Mod.Att
 L.CA.DLSCell.Mod.Succ
Observe the number of SCell changes based on event A6 in the monitored
cell, and calculate the successrate of the SCell changes in the cell.
 L.CA.DLSCell.Act.Att
 L.CA.DLSCell.Act.Succ
 L.CA.DLSCell.Deact.Att
 L.CA.DLSCell.Deact.Succ
Observe the number of attempts to activate or deactivate SCells for CA
UEs in the monitored cell, and calculate the success rate of activating or
deactivating SCells for CA UEs in the cell.
 L.CA.Traffic.bits.DL.PCell
 L.CA.Traffic.bits.DL.SCell
 L.CA.DL.PCell.Act.Dur
 L.CA.DL.SCell.Act.Dur
Observe the MAC-layer traffic volume of the CA UEs that treat the cell as
their PCell or SCell. In addition, observe the total duration of dow nlinkdata
transmission to the CA UEs that treat the cell as their PCell or SCell.
 L.Traffic.User.SCell.Active.DL.Avg
 L.Traffic.User.SCell.Active.DL.Max
Observe the average number and maximum number of CA UEs that treat
the cell as their SCell and have the cell activated.