What is the concept of bearer control mode in LTE and where exactly it has significance ?

Question

I need to know about what exactly timer concept is. What is the use of timers in lte ?. Why the timer concept is used.If this concept is not there then what happen?

Answer 1

Bearer Control Mode is basically used to tell bearer creation can happen only from UE side or both from UE and N/W side.

In LTE it is always UE/NE. Bearer creation can happen both from N/W side when PCRF sends RAR message with Charging-Rule-Install. From UE side bearer creation request will come when MME will send Bearer Resource Command

In case of legacy network Bearer Control Mode depends on 2 factor if the SGSN and or UE supports UE/NW mode. If either of them does not support bearer creation from N/W side Bearer Control Mide is sent to PCRF from PGW as UE only.

In case a UE handovers from LTE to 3GPP-GRPS in that case based on SGSN capability BCM could be changed to UE only.

Hope it helps.

Regards,
Peeyush Sharma