CE for Extended Cells

[mobilink999]

I am wondering why more CE are required for extended cell. Kindly someone explain....

[blaster949]

Hi

Extra CEs are needed because more Baseband resources are now needed for PRACH processing. Since for extended cell the "window" for PRACH processing is increased, more baseband processing is needed so more Ces are required.

[aygo]

Hi

for Nokia

Rel.1 HW (FSMB) CCCH Calculation:
UL/DL CE resources required for common control channels are defined per pool of 3 cells
Required CEs per pool of 3 cells depend on HW release and cell range
Cells up to 20 km:
26 CEs per 3 cells HW Rel’1 (FSPA)
52 CEs for up to 6 cells with FSPA
Cells > 20 km (Extended Cells)
20 km < R ≤ 60 km: Extended Cells 81 CEs per 3 cells (27 CEs per 1 cell)
60 km < R ≤ 120 km: 162 CEs per 3 cells (54 CEs per 1 cell)
120 km < R ≤ 180 km: 240 CEs per 3 cells (80 CEs per 1 cell)
Free of charge CE pool for Common Control Channels
HW Rel1: 32 CEs per system module

Rel.2 HW (FSMC/FSMD) CCCH calculation
For Rel.2 HW control channels are already noticed in the CE consumption
No need to calculated if cell radius and configuration is in following limits
For higher configurations and extended cells additional CEs are needed
FSMC can support with one module configuration up to 6 cells and with 10 km cell radius
FSMC can support 12 cells with cell radius of 10 km
Extension from 10 km  20 km is needing additional 36 CEs per cell

[aygo]

for E*******

The increase in cell range up to 80 km does not require additional hardware from a functional perspective, provided that RAX R2 is used. For cell ranges above 80 km, hardware dimensioning is required for RACH, i.e. one RAX R2 board per cell-carrier is needed.

[glen]

If you use cell extended cell then your TCH capacity will decrease