HCS Hierarchical Cell Structure

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HCS Hierarchical Cell Structure
Hierarchical Cell Structures (HCS) is a way of displacing the cell borders from the nominal cell border in an efficient and safe way. It provides the possibility and flexibility to give priority to cells that are not strongest but provide sufficient received signal strength and  the ability to prioritize between different layers and HCS bands when the handover candidates are ranked during Locating.  Up to 8 layers may be defined using HCS. The layers are distributed in ascending order in up to 8 HCS bands.  The feature offers two options: full HCS functionality (Multi layered HCS) and HCS reduced to 3 layers.

HCSBAND: Hierarchical Cell Structure band. HCSBAND This prioritises groups of layers. HCS band 1 has the highest priority.
HCS Parameter:
HCSBANDTHR: The signal strength threshold prioritises cells within a HCSBAND.
LAYER: Cell layer. LAYER defines which cell layers belong to the specified HCSBAND. Layer 1 has the highest priority.
LAYERTHR: The signal strength threshold is used for ranking of cells in different layers within each HCSBAND.
LAYERHYST: Layer hysteresis. The signal strength hysteresis is used for ranking cells in different layers within each HCSBAND.
THO: Time interval for measuring the number of handovers allowed (NHO) before an MS is considered as a fast moving mobile.
PSSTEMP: Signal strength penalty temporary offset.
PTIMTEMP: Penalty duration. PTIMTEMP specifies the duration during which PSSTEMP is valid.
NHO: Number of handovers during THO that are allowed   before an MS is considered as a fast moving mobile.
FASTMSREG: Handling of fast-moving mobiles switch.
          ON Handling of fast-moving mobiles switched on.
          OFF Handling of fast-moving mobiles switched off.
The network can be divided in up to eight different HCS layers. The layers are of different priorities. 
       Layer 1 has higher priority than Layer 2, Layer 3, Layer 4, ...
       Layer 2 has higher priority than Layer 3, Layer 4, Layer 5, ...
  The layers are grouped into HCS bands. An example of how layers can be grouped into bands is shown in figure:



Parameter Ranges and Default Values


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