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What are the different types of LTE timers?

How does the T300 timer work?

  • The T300 timer is started when the UE sends an RRCConnectionRequestmessage. If the timer expires before the UE has received a response in the form of an RRCConnectionSetupor Reject, the UE informs the higher layers and ends the connection procedure.

What happens when the t311 timer expires?

  • If T310 expires, the UE either enters Idle mode or initiates the connection reestablishment procedure, depending on whether security is activated. The T311 timer is started when the RRC reconnection procedure is started. If the timer expires before the selection of a suitable LTE (or other RAT) cell, the UE enters Idle mode.

What is the difference between ➨➨minimum and extended t3412 timer?

  • ➨Minimum: 16 Seconds Minimum Allowed Value, calculated from: (2*DRX cycles (MNO LTE DRX cycle value (e.g. 2.56sec)) + 10 seconds (buffer time)) = 2*2.56sec + 10 seconds = 16 seconds. Extended T3412 Timer is the value the device informs the network with Periodic Tracking Area Update (pTAU) that it is still registered.

image-What are the different types of LTE timers?
image-What are the different types of LTE timers?
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