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LTE QoS (Part 2) - LTE QoS Parameters (QCI, ARP, GBR, MBR and AMBR)
October 15, 2013 | By Dr. Michelle M. Do (tech@netmanias.com)
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Comments (17)
Boby 2014-08-21 15:59:14

SDF will deceide QOS and QCI,so these SDF will give PCRF at the time of provisoning. But SDF will different for INTERNET, SDF will different for SKYPE and SDF will different for IMS. SO my query is  how PCRF know this packet is came from Inetrnet,this packet is from IMS,this packet is from SKYPE(so based on this packets only SDF will decide right).

Abhi1103 2015-08-27 02:36:25

If Skype  and Internet has to have 2 different QoS, then PCEF shall get 2 different PCC rules one for each and its PCEF who has to decide  which rule has be applied, based on SDF filters configured.

SDF 1 for Skype  and SDF2 for Internet which will be configured in PCEF. SDF's are IP flows where multiple IP flows can have single SDF or single IP flow can have single SDF ,its completely operator driven.  

Tarun 2015-01-30 18:32:54

Nice and good description of QoS; Thank you very much.. i have below doubt, could you please

addrss it.

What is the difference between SDF and TFT, please give example if possible?

Joao Nuno 2015-04-16 21:55:02

Hello NetManias,

Thanks for the presentation..


I would like to know what the role of eNB in all this QoS process? is there any requirement from the eNB in order to keep the balance with what is pre-defined at Core level?


If we have a VIP User, how eNB knows that some specific QCI must be assign to that user? Are all the definitions/rules coming or set from the PCRF(PCC)?




Peeyush 2015-05-01 00:50:49

Hi Tarun,


As per my understanding TFT for a bearer is one. This term is basically used on the S5/S8 interface.

It can contain multiple SDF (Service Data Flow) which are realted to a particular service.


A single bearer can have multiple SDF which are mapped to different service. The packet filters which we send in a PCC rules are usually considered as SDF. Term SDF is usually used on the Gx interaface,


I hope it helps.




Gary Casagrande 2015-10-08 01:30:43

Hope someone can help. I am trying to understand what levers QCI manipulates to impact latency, packet loss, etc. Is it ARP? Secondary question. Why is QCI 6 better for video than QCI 7 (or the opposite). This goes to the base of the question... what are the levers that QCI is manipulating for the different levels of QCI. Thank you.

jamee dade 2016-06-08 09:26:55

Excellent comments ! I was fascinated by the specifics - Does someone know if my company could access a template DS-11 form to type on ?

CHARISSE LIPTON 2016-06-10 07:38:32

Greetings Jamee! my assistant saw a blank DS-11 form at this site http://pdf.ac/5gMlzi

nidhishankaryadav@gmail.com 2016-10-19 15:44:11

I would like to know what the role of eNB in all this QoS process? is there any requirement from the eNB in order to keep the balance with what is pre-defined at Core level?


If we have a VIP User, how eNB knows that some specific QCI must be assign to that user? Are all the definitions/rules coming or set from the PCRF(PCC)?

berseek 2016-11-18 15:55:20



 if GBR/MBR qos paramter of the specific flow (data flow)  are set to GBR bearer.  so that tuple of Bandwidth is below like

 MBR> bandwidth of the specific flow > GBR ,  am I right?  



Raj 2016-11-30 20:39:32

Thank you for such great information.....

yasin akar 2017-12-10 09:03:32


firstly, thanks for the valuable presentation. My Question is;


In case there are more than one PDN that a Ue connected, default bearers for all PDNs (i.e Internet, email and IMS services), maintaned until the UE detach? I mean, default bearer for IMS will be maintained after a Voice call has been ended (dedicated bearer released) and other services are in ongoing state. Or It will be maintained until the UE Powered Off. And after all services has ended, all of the default bearers still exists while UE in Idle state ( not detached).


thanks for your supports.

bijal 2018-09-07 21:50:12

i love you 

Dheeraj 2018-12-18 01:47:54

In lte a UE can have max 11 bearers, 3 SRBs and rest 8 DRBs. Out of the given 8 DRBs what is the max value of default bearers that can be configured for a UE ? 

I read somewhere that UE will be able to only have max 3 default bearers but found no 3gpp reference for the same.  Kindly tell me abt the max default bearers per UE in LTE and any 3gpp reference for the same ?

anamika 2019-05-23 16:03:34

Hi all,

Does UE AMBR decides the max num of ues that can be attached?If yes please do say how.

vikrant28 2020-05-06 18:13:48


As a bearer can have multiple SDFs in it if the QoS of all the SDF is diffferent how we will be deciding the bearer level QoS for the bearer with multiple SDF/Rule in it.

amit kasnale 2020-05-25 14:59:10

Is there any criteria where TFT filters IP packet like you mention SDF having set up rules 5 tuples?


Can you please suggest any spec for TFT filters?

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