Figure 4.2: Cell re-selection during the IDLE mode
Figure 4.2 shows the cell reselection process in the cellular environment. The process
begins with the intra frequency measured value of the serving cell getting below the
threshold value S
intrasearch
. Without the
𝑄
ℎ𝑦𝑦
and 𝑇
𝑟𝑟−𝑦𝑟𝑠𝑟𝑠𝑠𝑠𝑠𝑠
, the cell re-selection would
have begun at the intersection. This would result in the frequent cell re-selection as the
UE moves through the serving cell edges or when the link is subject to short term fad-
ing. After the serving cell measured value goes below the neighboring cell’s measured
value, the hysteresis value comes to play. The hysteresis value has to be exceeded for a
time of
𝑇
𝑟𝑟−𝑦𝑟𝑠𝑟𝑠𝑠𝑠𝑠𝑠
. After this time interval, the new cell is reselected.
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