What is CellReselection priority in LTE?
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Cell Reselection is a kind of mechanism to change cell after UE is camped on a cell and stay in IDLE mode. This is to let UE get connected to cell which has the best condition among all the cells to which the UE is allowed to camp on. But UE does not change cells randomly, it uses a set of pretty complicated criteria and algorithms for this reselection process. The details of these criteria andalgorithms will be described later but the high level guideline is as follows :
First Level Criteria : Absolute Priority
Second Level Criteria : Radio Link Quality
Third Level Criteria : Cell Accessibility
When you power on UE, usually it goes on with the following sequence.
i) Cell Detection/Search
ii) Cell Selection
iii) RACH and Completion of Registration
iv) < In IDLE >
v) Keep measuring RSRP/RSRQ for the cell it registered
vi) if RSRP/RSRQ is very poor or undetectable, go to step i) for finding other cell
if RSRP/RSRQ is measureable at least, it evaluate < Cell Reselection Criteria >
perform Cell Reselection if the criteria is met
stay in the current cell if the criteria is not met
Step vi) is the most complicated process during the idle stage and in this page I will mostly deal with < Cell Reselection Criteria >. Understanding this criteria is the most imporant thing in implementing and testing Cell Reselection.
First Level Criteria : Absolute Priority
Second Level Criteria : Radio Link Quality
Third Level Criteria : Cell Accessibility
When you power on UE, usually it goes on with the following sequence.
i) Cell Detection/Search
ii) Cell Selection
iii) RACH and Completion of Registration
iv) < In IDLE >
v) Keep measuring RSRP/RSRQ for the cell it registered
vi) if RSRP/RSRQ is very poor or undetectable, go to step i) for finding other cell
if RSRP/RSRQ is measureable at least, it evaluate < Cell Reselection Criteria >
perform Cell Reselection if the criteria is met
stay in the current cell if the criteria is not met
Step vi) is the most complicated process during the idle stage and in this page I will mostly deal with < Cell Reselection Criteria >. Understanding this criteria is the most imporant thing in implementing and testing Cell Reselection.
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cell reselection is a kind of mechanism to change cell after UE is camped on a cell and stay in IDLE mode. This is to let UE get connected to cell which has the best condition among all the cells to which the UE is allowed to camp on.
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