Once a user shifts to 2G/3G for making/attending a CSFB call, does it remain attached to the 2G/3G network or it re-attaches to the LTE network after the call is over? If it remains attached to 2G/3G, when does it shift back to LTE network?
After completing the voice call on the 2G/3G network the device will typically return to the 2G/3G Idle state. At this point, the cell reselection procedure is typically “weighted” to ensure the devices re-selects the 4G LTE network, i.e. 4G cells have a higher priority. Once reselection to 4G is performed the device performs a 4G Tracking Area Update procedure. This process is usually very fast.
explains in simple terms the CSFB principle
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Once a user shifts to 2G/3G for making/attending a CSFB call, does it remain attached to the 2G/3G network or it re-attaches to the LTE network after the call is over?
If it remains attached to 2G/3G, when does it shift back to LTE network?
After completing the voice call on the 2G/3G network the device will typically return to the 2G/3G Idle state. At this point, the cell reselection procedure is typically “weighted” to ensure the devices re-selects the 4G LTE network, i.e. 4G cells have a higher priority. Once reselection to 4G is performed the device performs a 4G Tracking Area Update procedure. This process is usually very fast.