Tracking cells for cell-reselection in a cellular communications system
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United States of America Patent
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May 22, 2012
Grant Date -
Oct 27, 2011
app pub date -
Apr 23, 2010
filing date -
Apr 23, 2010
priority date (Note) -
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Abstract
A user equipment (UE) in a cellular communication system tracks neighbor cells by periodically performing a signal measurement process and periodically performing a signal tracking process. Neighbor cells are ranked according to measured signal level, and the number of cells that are tracked is variable, and is based on the stability of the radio environment in which the UE is operating. The rate at which a neighbor cell changes from the status of not being the strongest neighbor cell to the status of being one is an indicator of environment stability. When a neighbor cell newly becomes the strongest ranking neighbor cell, the ranking that that neighbor cell had a predetermined time period ago can be used as an indicator of how many neighbor cells to track. The predetermined time period can be an average amount of time that it takes to track a neighbor cell.
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