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LTE: How does pre-emption process work for the bearers within lte ?

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LTE: How does pre-emption process work for the bearers within lte ?
posted Jul 31, 2014 by Neelam

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1 Answer

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In lte network, each E-RAB has QoS parameters i.e. priority level, pre-emption capability, pre-emption vulnerability. LTE core network provides all these parameters to E-UTRAN while establishing/modifying a bearer. Whenever there is a crunch of radio resource, E-UTRAN may decide to pre-empt existing bearer(s) based on their QoS parameter. E-UTRAN pre-empts sessions/bearers in the ascending order of priorities.

answer Aug 1, 2014 by Vimal Kumar Mishra
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+1 vote

In specification, I found two categories of QoS rules i.e., Signaled and Derived QoS rules. At a high level what I know that signaled QoS rules are the rules which are generated at core network and sent to UE as part of PDU SESSION ESTABLISHMENT. But I want to know what is derived QoS and where it is generated and used ?

+3 votes

I was trying to understand and implement basic version of 29.213 Section 6.3 QoS parameter mapping Functions at PCRF especially for non GBR bearers.

Non GBR bearers have QCI, ARP, APN-AMBR and UE-AMBR. And also MBR associated with each bearer in the PGW..So when a new bearer is added, the UE and Ennode-b dynamically take care that total rate of all bearers doesnot exceed APN-AMBR (for each APN) and UE-AMBR for all Non GBR bearers in UE..

So not sure PCRF can alter any params related to BW in case of non GBR.. This is my understanding..If you have any comments will be very helpful.

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