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What is the difference between QCI and ARP priority?

+2 votes
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I have a question concerning QoS management in LTE: there are two parameters for an EPC bearer: QCI (QoS class identifier that resumes a set of parameters(priority, packet delay, packet error rate…) and ARP (Allocation and retention priority) that defines the priority of a bearer. My question is : what is the difference between the QCI priority and the ARP priority ?

posted Jun 19, 2014 by Kuldeep Apte

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1 Answer

+1 vote

The difference between priority mapped from QCI and ARP based priority is as follows:

  1. QCI Priority refers to priority in terms of resource allocation for a specific service i.e. in case where the UE is running concurrently VoIP (higher QCI priority) session and browsing WWW (lower QCI priority), the resources are assigned firstly to packets of VoIP and then to WWW (and e.g. if we don’t have in the particular TTI resources to assign both packets, WWW need to wait and VoIP goes through).

  2. ARP priority refers to priority in terms of allocation of a service / bearer, i.e. if the eNB is highly loaded and a UE would like to setup VoIP (higher ARP priority) and WWW (lower ARP priority), the eNB would typically set only VoIP session, in order not to get overloaded. Or in other case if it is already overloaded it would kick off (retent) the bearers / services with lower ARP priorities.

answer Jun 20, 2014 by Mridul
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+1 vote

Hello all,

Can anybody suggests how we can set maximum bitrates for parameters like MBR, GBR (UL,DL), APN-AMBR(UL/DL), UE-AMBR(UL/DL) for GBR and Non GBR bearer.?

Are those values standard from PCRFor does it define dynamically based on user subscription.?
Please suggest some sources to choose the exact the bitrates for QoS parameters mentioned above.

Thanks in advance,
Naveen.

+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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