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Hi Martin, I would say typically operators try to assing a single URA per RNC. If however the network is smartphone heavy, then multiple URAs are needed. The number is driven by the URA paging load, which of course reduces the more URA are introduced. The obvious downside is the increase in URA updates. As with most things in life a compromise is required. Some more innovative vendor implementations will configure the UE to CELL_PCH first and if the RNC detects lots of cell updates (indicating a moving UE) will further reconfigure the UE to URA_PCH.


Yes, actually the URA was created with moving UEs in mind. So the original idea was to group cells in a same "direction" (like a highway or railroad). Of course, FD was not in mind at that time. Anyway if a UE is paged too frequent (say, less than 10 secs) the RNC will probably move it to Cell_DCH, so you won´t have a paging storm on the URA.


yep. never understood Cell_PCH. update everytime you switch cells - really?

paging across multiple cells out weighs the constant updates especially for UEs on the border that will do lots of updates.


Before smarthphones era, Location Area was in the size of Routing Area itself was in the size of one RNC.

Later on, because of the PS Paging load, many operators divided the RNC to few RA but LA remain the same size.

RA is PS paging area same as URA, so both RA and URA should be the same size and to include the same cells.

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