In [10], the authors assume each serving macrocell keeps a
profile of RSS (Received Signal Strength) levels, for which the
handover to a femtocell has been performed. Based on this
profile, the femtocells are scanned only if UE's observed RSSs
from neighboring macrocells correspond to the profile derived
from the past observations. However, this assumes continuous
scanning of all macrocells. This idea is further elaborated in
[3], where hierarchical scanning algorithm is defined. The
authors propose to split the algorithm for selection of scanned
cells into two layers. The first layer corresponds to the macrocells that are continuously scanned and so called “post
macrocell” is selected. The authors define the post macrocells
as the first macrocell providing RSS above -90 dBm. After the
post macrocell is identified, other macrocells are not scanned.
The second layer is represented by the femtocells. Only the
femtocells belonging to the post macrocell are scanned until a
femtocell provides RSS level above - 80 dBm. This algorithm
can lead to the situation when the femtocells are scanned even
if these are located on the other side of the post macrocell and
handover to these femtocells is not possible.
In [10], the authors assume each serving macrocell keeps aprofile of RSS (Received Signal Strength) levels, for which thehandover to a femtocell has been performed. Based on thisprofile, the femtocells are scanned only if UE's observed RSSsfrom neighboring macrocells correspond to the profile derivedfrom the past observations. However, this assumes continuousscanning of all macrocells. This idea is further elaborated in[3], where hierarchical scanning algorithm is defined. Theauthors propose to split the algorithm for selection of scannedcells into two layers. The first layer corresponds to the macrocells that are continuously scanned and so called “postmacrocell” is selected. The authors define the post macrocellsas the first macrocell providing RSS above -90 dBm. After thepost macrocell is identified, other macrocells are not scanned.The second layer is represented by the femtocells. Only thefemtocells belonging to the post macrocell are scanned until afemtocell provides RSS level above - 80 dBm. This algorithmcan lead to the situation when the femtocells are scanned evenif these are located on the other side of the post macrocell andhandover to these femtocells is not possible.
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