Channel Elements
Available CE:
The number of UL and DL CEs supported by a NodeB is determined
by the DU type capabilities and the licensed CE capacity.
Needed CE:
The number of channel elements required in RBS is dependent on the
radio bearers to be used (Service), as well as on the number of
simultaneous users for each specific radio bearer.
Congestion Cause:
If there is an insufficient amount of channel elements available,
blocking might occur.
Available CE < Needed CE
Services at different rates require different numbers of CEs
Basic Channel Element Concepts
 CE resources are managed by both the RNC and NodeB. The
NodeB reports its CE capacity to the RNC. The RNC
determines whether to admit a new service based on the
number of CEs that need to be consumed and controls CE
resources during CE congestion.
 CE resources required on the UL and DL common channels
& CE resources for the high-speed downlink shared
channel (HS-DSCH) and the related control channels are
reserved by the NodeB. Therefore, they do not occupy the
licensed CE capacity.
R99 Service CE Consumption
Enhanced Uplink (EUL)
Practices:
The below table shows the available number of UL CE per DU type.
DU Type
DUW10
DUW20
DUW30
DUW31
DUW41
BB5212
BB5216
BB5216 Mixed (2 Tech.)
BB5216 Mixed (3 Tech.)
UL -Static CE
128
384
512
512
768
576
1152
576
288
Total UL- CE (After Features)
192
576
768
768
1152
1920
4096
2048
1024
Ericsson UL CE features:
 Extension (FeatureStateCeExtForEul) for DU sites.
 Additional
Solve UL-CE Congestion:
 Check “LicenseCapacityRbsChannelElementUplink” if it is equal
to the max value related to the installed DU type.
 Check the SW version of the site (currently should be W18.Q2)
 Check the below features:
o FeatureStateCeExtForEul→1 for DU sites
o PerHarqProcessGrant→1 for DU sites
o CXC4011962(BB HWAC Expansion Modle→3 for BB sites
o CXC4020069 (CE Extension) →1 for BB sites
o CXC4020103 (Additional CE for EUL) →1 for BB sites
o CXC4010624→0 for BB sites (checked by NOC)
o CXC4011040→0 for BB sites (checked by NOC)
 Make the below parameter changes:
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o Sf16Adm=16
o Sf16AdmUl=16
o Sf4AdmUl=0
o Sf8AdmUl=0
o Sf8Adm=0
o Sf32Adm=16
o UlHwAdm & DlHwAdm=99
Push CS Traffic to 2G by reducing the 2G Parameter IsHoLev
Reduce traffic/Coverage:
o Decrease CPICH power
o Increase Tilt
Decrease (EulServingCellUsersAdm)
Connecting 2 DUs
Un-Share the technologies for the BB sites
Change the DU to a more capacity one.
Add New Site