tag:blogger.com,1999:blog-1329449351744515518.post3882455117655117769..comments2023-09-16T01:28:38.178-07:00Comments on Wired n Wireless: MME Pool – Load Balancing and Re-balancingSantosh Dornalhttp://www.blogger.com/profile/08888256274707899999noreply@blogger.comBlogger29125tag:blogger.com,1999:blog-1329449351744515518.post-76444573796590948992012-05-02T19:00:04.259-07:002012-05-02T19:00:04.259-07:00Yes, UE doesn't care about which MME it is con...Yes, UE doesn't care about which MME it is connected to, how ever the GUTI assigned to UE will have MME group I'd an code, which can be used to identify a MME.<br /><br />Yes, eNB can feel free to connect to or route calls to different MME if serving MME is over loadedSantosh Dornalhttps://www.blogger.com/profile/08888256274707899999noreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-53565780377551508662012-05-02T09:14:39.722-07:002012-05-02T09:14:39.722-07:00I'm new to this blog. Interesting discussion. ...I'm new to this blog. Interesting discussion. My be a dumb question. I'm curious on why the UE need to know which MME it is connected.Can't the eNode-B hide the details. eNodeB could connect to alternate MME if the current active becomes overloaded. thanks for your response.raghavhttps://www.blogger.com/profile/07554342248949863774noreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-22718245385099831672012-04-03T11:53:39.843-07:002012-04-03T11:53:39.843-07:00Well.. while offloading it can release the Iu conn...Well.. while offloading it can release the Iu connection with TAU required. This will make eNB redirect the further messages to another MME. <br /><br />Overload start and stop can be used too.<br /><br />Relative Capacity is also another way. <br /><br /><br />Refer to 36.413 and 23.401Santosh Dornalhttps://www.blogger.com/profile/08888256274707899999noreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-49813030065271788582012-04-03T05:30:07.996-07:002012-04-03T05:30:07.996-07:00Hi Santhosh,
When a MME is offloading, is it not...Hi Santhosh, <br /><br />When a MME is offloading, is it not necessary to update eNBs with reduced-capacity (via "Relative MME Capacity" of MME_CONFIGURATION_UPDATE message) so that eNBs do not divert newer traffic to the MME which is in offloading-mode ?<br /><br />Is it also mandatory to prevent new S1-Setups in this case ?<br /><br />Without these, offloading may be only partial and non-deterministic. <br /><br />Could not find anything specifically in R9 docs in this regard<br /><br />Regards<br />MuthuMuthukumaranhttps://www.blogger.com/profile/07987673442576535276noreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-5740379642522775312012-02-11T18:33:33.357-08:002012-02-11T18:33:33.357-08:00YesYesSantosh Dornalhttps://www.blogger.com/profile/08888256274707899999noreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-39314607068006685502012-02-11T08:37:14.357-08:002012-02-11T08:37:14.357-08:00Hi Santosh,
I just want to know if e-NodeB suppor...Hi Santosh,<br /><br />I just want to know if e-NodeB support MME active & standby sort of. <br />e-NodeB is connecting to MME A when MME A has no problem. But if MME A has a problem, e-NodeB tries to connect to MME B.<br /><br />Cheers,<br />HarishHarishhttps://www.blogger.com/profile/09565685404656118683noreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-23736609789704200472011-10-10T13:56:26.470-07:002011-10-10T13:56:26.470-07:00Hi! Thanks for the article. Can you recommend any ...Hi! Thanks for the article. Can you recommend any source where I could learn more details about using DNS at eNB for achieving load balancing? I cannot find anything about this method neither in 3GPP documentation nor in the Internet. Thank you! /ElenaElenanoreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-19558064717652353022011-09-15T09:32:12.752-07:002011-09-15T09:32:12.752-07:00Hey, Can we do Load balancing and ICIC b/w two eNo...Hey, Can we do Load balancing and ICIC b/w two eNodeB's when there is no X2 b/w them.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-46577572313775251152011-07-28T06:45:44.307-07:002011-07-28T06:45:44.307-07:00Here is a link to an article on LTE signaling woes...Here is a link to an article on LTE signaling woes ...<br /><br />http://www.lightreading.com/document.asp?doc_id=209574oc-edhttps://www.blogger.com/profile/11303628859527820210noreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-84055605182014373882011-07-27T17:07:07.675-07:002011-07-27T17:07:07.675-07:00Hi Rauf
I am not an expert at Radio. But UE conn...Hi Rauf <br /><br />I am not an expert at Radio. But UE connection may be dropped or RRC may be modified. But if you have insights on RRC spec do let us know how the load balancing tau works on radio side. <br /><br />Cheers,<br />SantoshSantosh Dornalhttps://www.blogger.com/profile/08888256274707899999noreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-63302219144550186902011-07-27T17:00:22.217-07:002011-07-27T17:00:22.217-07:00I havent heard of signalling issues on LTE. Every ...I havent heard of signalling issues on LTE. Every node in core network is designed to handle load. Not sure how it is done on eNB. <br /><br />Anyone?Santosh Dornalhttps://www.blogger.com/profile/08888256274707899999noreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-78796337198492832892011-07-27T13:43:47.374-07:002011-07-27T13:43:47.374-07:00Hi Santosh,
At the case of MME load re-balancing ...Hi Santosh,<br /><br />At the case of MME load re-balancing when it moves the call to other MME, source MME releases the S1 resources and UE performs "load balncing TAU" directed by eNB through RRC message.<br /><br />I cannot understand why radio (rrc) connection re-establishment from UE side is necessary. Moreover, if all UEs rrc connection re-establish at the same time, as surely happen in this case, it will bring signaling congestion in network side.<br /><br />Is there any problem in this approach where eNB just establish new S1-connection with target MME and redirect UE's packet UL/DL side without affecting radio connections?Raufhttps://www.blogger.com/profile/07850184738288530992noreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-33410095470471009022011-07-27T08:26:37.573-07:002011-07-27T08:26:37.573-07:00Thank you for the informative article Santosh.
Is...Thank you for the informative article Santosh.<br /><br />Is anyone looking at ways to measure the overall signalling load as well as signalling load on a per sNodeB and/or ue basis? <br /><br />I have seen some discussion of the potential problems with signalling in LTE and am interested in how to track that as a set of performance KPIs.oc-edhttps://www.blogger.com/profile/11303628859527820210noreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-49992203059439173572011-07-10T15:33:29.854-07:002011-07-10T15:33:29.854-07:00S1 setup response and MME configuration update.
...S1 setup response and MME configuration update. <br /><br />Yes, it should be a static configuration.Santosh Dornalhttps://www.blogger.com/profile/08888256274707899999noreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-6561718438602112132011-07-09T21:43:34.632-07:002011-07-09T21:43:34.632-07:00Santosh, which S1-AP or EMM message carry the MME ...Santosh, which S1-AP or EMM message carry the MME weight factor?<br /><br />Is weight factor a static configuration for MMEs in pool? If so, which attribute carries the current load factor of MME?Bhanu Magadihttps://www.blogger.com/profile/10995292604031301735noreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-25997831463399886962011-07-04T08:53:46.381-07:002011-07-04T08:53:46.381-07:00Hello
No! eNB is not configured for one MME. Ther...Hello<br /><br />No! eNB is not configured for one MME. There can be a many to many relation between eNB and MME. Hence eNB may do a dns query to find an MME based on GUTI.Santosh Dornalhttps://www.blogger.com/profile/08888256274707899999noreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-49979034281310414582011-06-28T13:20:19.605-07:002011-06-28T13:20:19.605-07:00Hello Santosh,
First of all, thanks for this nice...Hello Santosh,<br /><br />First of all, thanks for this nice article. I have problem understanding the third method. Why DNS query is required in last method? EnodeB is configured for that particular MME, Right? It seems to me this method has more overhead than first one - weight factor, as it waits for MME response.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-18073041029635275162011-06-24T10:59:38.413-07:002011-06-24T10:59:38.413-07:00If MME fails, S1 will be released. So eNB will rel...If MME fails, S1 will be released. So eNB will release the RRC connections and UE may go to idle mode. UE can do service request which can be directed to a different MME.Santosh Dornalhttps://www.blogger.com/profile/08888256274707899999noreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-38859436156319127762011-06-23T23:24:11.732-07:002011-06-23T23:24:11.732-07:00Another naive question!!
I was wondering if the M...Another naive question!!<br /><br />I was wondering if the MME fails in the middle of ongoing data call (data passing through S-GW between PDN and UE, bearer activation is already done for that UE) what will be the behavior of the ongoing data call. Will it be failed on instant due to MME failure?Raufhttps://www.blogger.com/profile/07850184738288530992noreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-72451156965516365712011-06-03T13:16:53.245-07:002011-06-03T13:16:53.245-07:00Hi Rauf
Its upto the MME to decide when it is ove...Hi Rauf<br /><br />Its upto the MME to decide when it is overload. Number of Subscribers is 1, other could cpu overload or anything. Its basically a implementation factor. Different vendors have different overload conditions.Santosh Dornalhttps://www.blogger.com/profile/08888256274707899999noreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-65162769910009505592011-06-03T09:04:24.707-07:002011-06-03T09:04:24.707-07:00Hi Santosh,
I am new to this blog. I have a naive...Hi Santosh,<br /><br />I am new to this blog. I have a naive question!<br /><br />I just went through Overload related procedure of TS 36.413 which describes<br /><br />"The purpose of the Overload Start<br />procedure is to inform an eNB to reduce the signalling load towards the concerned MME."<br /><br />What should be the criteria of measuring signalling load or Weight Factor? Number of UE connections?Raufnoreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-19001528549591364872011-05-09T10:26:49.269-07:002011-05-09T10:26:49.269-07:00Gabriel Brown on my blog! Cool!
Well I wouldn...Gabriel Brown on my blog! Cool! <br /><br />Well I wouldn't be too worried when integration is considered. <br /><br />If 3G network is well laid then we can simply fit the LTE network into the same topology, i.e from mobile core point. Also operators are very much interested in combining both SGSN and MME onto a single node making the interRat handovers a bit easy. If existing network is designed for redundancy then fitting in LTE shouldn't be much of problem.Santosh Dornalhttps://www.blogger.com/profile/08888256274707899999noreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-30335147923305029472011-05-09T02:56:21.895-07:002011-05-09T02:56:21.895-07:00Hi Santosh -- any views on what the influence of M...Hi Santosh -- any views on what the influence of MME Pool might be on the decision about whether or not to integrate SGSN and MME equipment?Gabriel Brownhttp://www.twitter.com/gabeuknoreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-34373605959556079142011-03-30T20:07:48.502-07:002011-03-30T20:07:48.502-07:00Oops...wrong comment. I am not sure of the PGW tal...Oops...wrong comment. I am not sure of the PGW talking HSS spec. I know the spec which gives call flows for online and offline billing.Santosh Dornalhttps://www.blogger.com/profile/08888256274707899999noreply@blogger.comtag:blogger.com,1999:blog-1329449351744515518.post-21807549530019541712011-03-30T20:04:46.788-07:002011-03-30T20:04:46.788-07:00Hi...i believe thats up to PGW implementation. Spe...Hi...i believe thats up to PGW implementation. Specs doent speak of that.Santosh Dornalhttps://www.blogger.com/profile/08888256274707899999noreply@blogger.com