When operators require aggregation of three downlink CCs:
l If the total bandwidth is less than or equal to 40 MHz, enable only LAOFD-080207 Carrier Aggregation for Downlink 3CC in 40MHz.
l If the total bandwidth is greater than 40 MHz and less than or equal to 60 MHz, enable both LAOFD-080207 Carrier Aggregation for Downlink 3CC in 40MHz and
LAOFD-080208 Carrier Aggregation for Downlink 3CC in 60MHz.
11.2 Required Information
For details, see 6.2 Required Information.
11.3 Planning
RF Planning
For details about RF planning, see 6.3 Planning.
Network Planning
For details about network planning, see 6.3 Planning. eRAN
Carrier Aggregation Feature Parameter Description
LAOFD-080208 Carrier Aggregation for Downlink 3CC in 60MHz
Hardware Planning
In addition to hardware planning described in 6.3 Planning, select BBPs as follows: Do not use LBBPc as the BBP to serve the PCells of CA UEs.
11.4 Deployment
Deploy this CA feature on three inter-frequency cells served by either the same eNodeB or different eNodeBs that are interconnected in multi-BBU interconnection scenarios.
11.4.1 Requirements
Operating Environment
None
NEs
The requirements described in 6.4.1 Requirements must be fulfilled. Specifically: l To allow downlink 3CC aggregation to reach a peak data rate of 450 Mbit/s in 2x2
MIMO scenarios, the maximum bit rate that the UE subscribes to in the EPC must be greater than or equal to 450 Mbit/s.
l UEs must comply with 3GPP Release 12 or later and support the frequency bands of the carriers to be aggregated and their channel bandwidths.
Transmission Networking
For details, see 6.4.1 Requirements.
License
A cell can act as a PCell in downlink 3CC aggregation only if CaDl3CCSwitch under the CaMgtCfg.CellCaAlgoSwitch parameter is on for the cell. LAOFD-080207 Carrier Aggregation for Downlink 3CC in 40MHz and LAOFD-080208 Carrier Aggregation for Downlink 3CC in 60MHz are both under license control in eRAN8.1. Each cell involved in 3CC aggregation requires one sales unit of the license for LAOFD-080207 Carrier
Aggregation for Downlink 3CC in 40MHz or LAOFD-080208 Carrier Aggregation for Downlink 3CC in 60MHz. For the two features to take effect, their prerequisite features must be licensed. See the following table.
Feature
ID Feature Name Model LicenseControl Item NE Sales Unit
LAOFD-0 01001 LTE-A Introduction LT1SA020C A00 LTE-A Introduction (FDD)
eNodeB per cell eRAN
Carrier Aggregation Feature Parameter Description
LAOFD-080208 Carrier Aggregation for Downlink 3CC in 60MHz
Feature
ID Feature Name Model LicenseControl Item NE Sales Unit
LAOFD-0 01002 Carrier Aggregation for Downlink 2CC in 40MHz LT1SA040C A00 Carrier Aggregation for Downlink 2CC in 40MHz (FDD)
eNodeB per cell
LAOFD-0 80207 Carrier Aggregation for Downlink 3CC in 40MHz LT1SCAD4 0M00 Carrier Aggregation for Downlink 3CC in 40MHz (FDD)
eNodeB per cell
LAOFD-0 80208 Carrier Aggregation for Downlink 3CC in 60MHz LT1SCAD6 0M00 Carrier Aggregation for Downlink 3CC in 60MHz (FDD)
eNodeB per cell
Others
The prerequisite features for the CA feature must have been enabled.
11.4.2 Data Preparation
Make data preparation as described in 6.4.2 Data Preparation. In addition, set the following switch on.
Parameter
Name Parameter ID Setting Notes Data Source
Cell Level CA Algorithm Switch CaMgtCfg.Cel lCaAlgoSwitch
The CaDl3CCSwitch option of this parameter specifies whether to enable downlink 3CC aggregation.
l To enable downlink 3CC aggregation, set this switch on. l To disable downlink 3CC
aggregation, set this switch off.
User-defined
11.4.3 Precautions
For details, see 6.4.3 Precautions.
11.4.4 Hardware Adjustment
For details, see 6.4.4 Hardware Adjustment. eRAN
Carrier Aggregation Feature Parameter Description
LAOFD-080208 Carrier Aggregation for Downlink 3CC in 60MHz
11.4.5 Activation
Step 1 Configure cells or frequencies.
l In CA-group-based configuration mode, perform the MML-based procedure described in 6.4.5 Activation with the following exceptions: Add three cells to the CA group in step 3, and configure two candidate SCells for each PCell in step 4.
l In frequency-based or adaptive configuration mode, perform the MML-based procedure described in 6.4.5 Activation with the following exception: Add at least two candidate SCCs and set their attributes for each candidate PCC in step 3.
Step 2 On the U2000 client, run the MOD CAMGTCFG command with the
CaDl3CCSwitch(CaDl3CCSwitch) option of the Cell Level CA Algorithm Switch parameter selected.
MOD CAMGTCFG:LOCALCELLID=0,CELLCAALGOSWITCH=CaDl3CCSwitch-1; ----End
11.4.6 Activation Observation
After downlink 3CC aggregation is enabled, the eNodeB configures two SCells for a CA UE when the required conditions are met. Observe the counters listed in the following table to obtain PCell statistics. If L.Traffic.User.PCell.DL.3CC.Avg produces a non-zero value, CA has been activated successfully. If the value remains at zero and 3CC CA UEs exist in the network, CA feature activation may fail.
Table 11-1 Performance counters related to downlink 3CC aggregation
Counter ID Counter Name Description
1526732907 L.Traffic.User.PCell.D L.3CC.Avg
Average number of UEs that treat the local cell as their PCell and each have two SCells configured
1526732915 L.Traffic.User.PCell.D L.3CC.Active.Avg
Average number of UEs that treat the local cell as their PCell and each have two SCells activated
11.4.7 Deactivation
In addition to the steps in 6.4.7 Deactivation, perform the following step on the U2000 client: Run the MOD CAMGTCFG command with the CaDl3CCSwitch(CaDl3CCSwitch) option of the Cell Level CA Algorithm Switch parameter deselected.
MOD CAMGTCFG:LOCALCELLID=0,CELLCAALGOSWITCH=CaDl3CCSwitch-0;
11.5 Performance Monitoring
In addition to the counters listed in 6.5 Performance Monitoring, monitor the following counters and compare them with the network plan to evaluate feature performance. eRAN
Carrier Aggregation Feature Parameter Description
LAOFD-080208 Carrier Aggregation for Downlink 3CC in 60MHz
Counter ID Counter Name Description 1526732907 L.Traffic.User.PCell.DL.
3CC.Avg
Average and maximum numbers of downlink 3CC CA UEs that treat the local cell as their PCell
1526732908 L.Traffic.User.PCell.DL. 3CC.Max
1526732915 L.Traffic.User.PCell.DL. 3CC.Active.Avg
Average and maximum numbers of downlink 3CC CA UEs that treat the local cell as their PCell and have all their SCells activated
1526732916 L.Traffic.User.PCell.DL. 3CC.Active.Max
1526732917 L.CA.DL.PCell.3CC.Act.Dur Total duration in which all SCells are active for 3CC CA UEs that treat the local cell as their PCell
1526733012 L.Thrp.bits.DL.3CC.CAUser Total downlink PDCP-layer traffic volume of 3CC CA UEs that treat the local cell as their PCell and have all their SCells activated
11.6 Parameter Optimization
For details, see 6.6 Parameter Optimization.
11.7 Troubleshooting
For details, see 6.7 Troubleshooting. eRAN
Carrier Aggregation Feature Parameter Description
LAOFD-080208 Carrier Aggregation for Downlink 3CC in 60MHz