tag:blogger.com,1999:blog-1329449351744515518.post4614720247543219009..comments2023-09-16T01:28:38.178-07:00Comments on Wired n Wireless: LTE: QoS (Part 2)Santosh Dornalhttp://www.blogger.com/profile/08888256274707899999noreply@blogger.comBlogger37125tag:blogger.com,1999:blog-1329449351744515518.post-78759549132588854052012-05-04T11:02:32.672-07:002012-05-04T11:02:32.672-07:00Hi
Quite a few questions there.
- Network tell...Hi <br /><br />Quite a few questions there. <br /><br />- Network tells UE when to use dedicated bearer and for what traffic based on the UE subscription. <br />- A dedicated bearer may be created during initial attach itself with a TFT. <br />- A default bearer may also be associated with a TFT. <br />- Default bearer doesnt have MBR/GBR. <br />- UE starts mapping data to a radio bearer as and when it receives a TFT, else everything is sent over default beare. <br />- PCRF/PGW decides when and with what filters a dedicated bearer has to be created. This depends on network config and user subscriptionSantosh Dornalhttps://www.blogger.com/profile/08888256274707899999noreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-65818236838418361352012-05-03T20:49:08.199-07:002012-05-03T20:49:08.199-07:00Hi Santosh,
I am quite new to this LTE QoS and TFT...Hi Santosh,<br />I am quite new to this LTE QoS and TFT. So based on your example for UL HTTP, questions...<br />1. Lets say, if this is the very first time HTTP app that UE wants to use, how does UE or App decide to use Dedicated bearer? There is already Default Bearer, why not to use it? Who does decide to use Dedicated Bearer for specific app (in this case HTTP). Is it hard coded in UE for Layer 7? or is it provided to UE during Initial Attach? As far as I know, in Default Bearer setup, ONLY QCI, ARP and GBR/MBR is supplied to UE. THere is NO UL TFT information provided.<br />2. Continuing the above question, when UE or App has decided to use Dedicated bearer for HTTP, UE first has to have to have knowledge of UL TFT? So for the very first time of HTTP use, how does UE get knowledge of UL TFT? When UE or user clicks on HTTP browser, does it send some signalling data to MME hence to PGW which decides that this requires Dedicated Bearer? And then PGW initiates Create Dedicated Bearer Request?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-65983355090301048562012-02-08T07:01:47.578-08:002012-02-08T07:01:47.578-08:00Hi,
There is a maximum of 11 EPS bearers between ...Hi,<br /><br />There is a maximum of 11 EPS bearers between an UE IP and APN. one or more of these EPS bearers can be mapped to a DRB. Since there can be a max of only 8 DRBs, how is it possible to use all 11 EPS bearers?<br /><br />RegardsRam Asokanhttps://www.blogger.com/profile/07033731896285946369noreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-76328998671700299442011-08-31T17:43:29.764-07:002011-08-31T17:43:29.764-07:00There will be no negotiation...u may request for a...There will be no negotiation...u may request for anything, but what PCRF decides will be enforced.Santosh Dornalhttps://www.blogger.com/profile/08888256274707899999noreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-92021712257099844072011-08-31T14:38:22.419-07:002011-08-31T14:38:22.419-07:00If my application(for IMS voice call)requires QOS ...If my application(for IMS voice call)requires QOS that EPS is not ready to give then in that case EPS will reject the dedicated bearer creation? or will there be any negotiation?GAURAVhttps://www.blogger.com/profile/07972838449843399618noreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-19390443457237338882011-02-23T18:43:26.346-08:002011-02-23T18:43:26.346-08:00Refer to 3GPP TS 23.401 section 5.4.5
SantoshRefer to 3GPP TS 23.401 section 5.4.5<br /><br />SantoshSantosh Dornalhttps://www.blogger.com/profile/08888256274707899999noreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-21086562452619329632011-02-23T14:03:19.148-08:002011-02-23T14:03:19.148-08:00Hi there,
You wrote the UE can ask for a dedicate...Hi there,<br /><br />You wrote the UE can ask for a dedicated bearer for HTTP traffic. Could please explain how the UE can initiate the process of getting dedicated bearer for any specific data traffic?<br /><br />BR<br /><br />EmonEmonnoreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-27324056163807183062010-05-03T03:54:53.198-07:002010-05-03T03:54:53.198-07:00Hi
1. TFT thing is coming from 3G. You can second...Hi<br /><br />1. TFT thing is coming from 3G. You can secondary PDP contexts mapped to a TFT. <br />2. I am quite not sure of the improvements from 3G. But visible change is QoS is simplified in LTE. We have too many fields for QoS mapping in 3G but in LTE they are made simple. More over the network takes full control of QoS, which means QoS negotiation is not possible in LTE. <br /><br />Thanks, SantoshSantosh Dornalhttps://www.blogger.com/profile/08888256274707899999noreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-45266635378636611932010-04-30T05:21:16.999-07:002010-04-30T05:21:16.999-07:00Hi,
Thank you for the nice post. Two questions, ...Hi, <br /><br />Thank you for the nice post. Two questions, please:<br /><br />1) In a previous comment, you wrote:<br /><br />"You can compare the primary PDP context to default and secondary PDP context to dedicated bearers. The only difference is dedicated bearers in LTE are initiated by EPC where as secondary PDP contexts are UE initiated. "<br /><br />So, this means there is no innovation in going from 3G to LTE about QoS. I thought this concept of being able of putting different traffic on different bearers via TFT was related to LTE only.<br /><br />What is the improvement in LTE compared with 3G then?<br /><br />2) LTE introduced the concept of labeled QoS profile. What is it and what is the improvement from 3G?Davidenoreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-34702651437161283452010-04-12T06:24:25.283-07:002010-04-12T06:24:25.283-07:00Dear all,
I invite you to publish such Articles (...Dear all,<br /><br />I invite you to publish such Articles (especially from 4G/LTE topics) with us at <br />www.4gwirelessjobs.com/articles.<br /><br />Thank you.<br />RobinAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-65876541319432907122010-04-06T22:17:08.219-07:002010-04-06T22:17:08.219-07:00You are welcome!You are welcome!Santosh Dornalhttps://www.blogger.com/profile/08888256274707899999noreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-65634258526762635492010-04-06T22:13:34.270-07:002010-04-06T22:13:34.270-07:00Yes, that is more clear. Thanks Santosh, your post...Yes, that is more clear. Thanks Santosh, your posts have been very helpful in understanding LTE/SAE as I just have started working on it.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-18376974305551705322010-04-06T21:28:59.288-07:002010-04-06T21:28:59.288-07:00You are correct. The TFT should be replaced with p...You are correct. The TFT should be replaced with packet filter in the statement. <br /><br />The post was written keeping UE request bearer creation/modification in mind. This means that UE will send TAD(partial TFT) to network and network shall decide whether to update the exiting TFT with packet filter or to create a TFT.Santosh Dornalhttps://www.blogger.com/profile/08888256274707899999noreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-66077963789358850512010-04-06T06:20:38.199-07:002010-04-06T06:20:38.199-07:00Then there is slight confusion regarding the state...Then there is slight confusion regarding the statements in your post that say "So it sends out Update bearer request with newly added TFT for IMAP. (We already have TFT for HTTP)" and "Once email is done, PGW may remove that TFT (IMAP) from dedicated bearer." which I understood as there would be 2 TFTs in a dedicated bearer. Please correct me if I am wrong.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-78287563111863454222010-04-06T06:10:38.433-07:002010-04-06T06:10:38.433-07:00Yes. As far as I know the statement is correct.Yes. As far as I know the statement is correct.Santosh Dornalhttps://www.blogger.com/profile/08888256274707899999noreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-45624938360957623012010-04-06T05:38:12.723-07:002010-04-06T05:38:12.723-07:00In any case, there will be only one TFT per dedica...In any case, there will be only one TFT per dedicated bearer (which in turn may contain many packet filters), is this statement correct?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-61727493889951979002010-04-06T05:26:02.696-07:002010-04-06T05:26:02.696-07:00There are two things here, if the network feels th...There are two things here, if the network feels that existing dedicated bearer qos is enough to serve IMAP then it will update the dedicated bearer packet filter. Else network may initiate a new dedicated bearer for IMAP.Santosh Dornalhttps://www.blogger.com/profile/08888256274707899999noreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-52826215428416903522010-04-06T05:16:51.110-07:002010-04-06T05:16:51.110-07:00Is there a TFT that is being added to the dedicate...Is there a TFT that is being added to the dedicated bearer for IMAP traffic or it is just a packet filter that being added to the existing TFT because as per my knowledge, there is one-to-one relationship between a TFT and dedicated bearer. Please correct me if I am wrong.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-62510207723780961662009-10-12T09:21:02.456-07:002009-10-12T09:21:02.456-07:00Each QCI value can be mapped to IP type of service...Each QCI value can be mapped to IP type of service (TOS). Eg:- QCI =1 can be mapped to AF31, QCI=2 can be AF32. It depends on what kind of service you want to give for a QCI. QCI is merely a identifier.Santosh Dornalhttps://www.blogger.com/profile/08888256274707899999noreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-23032533730071977272009-10-12T00:29:13.312-07:002009-10-12T00:29:13.312-07:00how can we map between the QCI and DSCPhow can we map between the QCI and DSCPAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-14507880314815943942009-09-24T04:15:05.368-07:002009-09-24T04:15:05.368-07:00hi,
How TFT is used in UE side ?
What part of lay...hi,<br /><br />How TFT is used in UE side ?<br />What part of layer in UE will enforce these TFT parameters on to the packet?<br />if possible can any one tell me the link of spec .......<br /><br />krishna kishorevkkstylehttps://www.blogger.com/profile/00415306735482352606noreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-13828941907535821392009-08-13T09:21:54.056-07:002009-08-13T09:21:54.056-07:00I dont think so. UMTS bearer might mean bearer for...I dont think so. UMTS bearer might mean bearer for UMTS network in LTE, not sure again.Santosh Dornalhttps://www.blogger.com/profile/08888256274707899999noreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-54695119717128194342009-08-13T03:34:22.987-07:002009-08-13T03:34:22.987-07:00Is it possible taht they call LTE as UMTS bearer??...Is it possible taht they call LTE as UMTS bearer??? TS 23.107Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-28348439775863034482009-08-13T02:42:38.009-07:002009-08-13T02:42:38.009-07:00Thank you very much. I will have a look.
mpgonzaThank you very much. I will have a look.<br /><br />mpgonzaAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-6697175259745463752009-08-13T02:06:51.973-07:002009-08-13T02:06:51.973-07:00Absolute co-incidence. I was just reading this.
...Absolute co-incidence. I was just reading this. <br /><br />3GPP TS 23.401 Annex E -- Might help!Santosh Dornalhttps://www.blogger.com/profile/08888256274707899999noreply@blogger.com