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Can anybody explain what exactly the term "Blind Handover" mean ??6 months ago

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Follow ShaileshShailesh chidrawar • It is a handover which is happen without measurement report i.e. BS directly instruct a UE for selecting particular neighboring cell.6 months ago• Like

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Follow Vinay SagarVinay Sagar Deekonda • @Shailesh : In which scenario does Blind Handover happen?? Does Blind Handover happen only during Inter System Handover case ( UE connected to LTE Ntwk moves into area where LTE Ntwk is'nt there and so latches onto UMTS Ntwk available in that particular area ) or even within same System does Blind Handover Happens(UMTS-UMTS)??6 months ago• Like

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Follow ShaileshShailesh chidrawar • Blind Handover happens only during intersystem handover. 

Consider a case, eNB must aware of UMTS neighboring cell for certain LTE cells. If signal quality decreases, then MME reports to SGSN or MSC that 2G/3G handover is necessary. So here blind handover happen because no measurement report of UMTS cell is available for handover decision. 

There are multiple disadvantages of this procedure e.g. what happen if UE not able to sync with GSM/UMTS cell? And most important is if the user is already having voice call then there must be some interruption in call.6 months ago• Like

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Follow ShaileshShailesh chidrawar • Inter System Handover: Signaling: Through S3 interface between MME and 3G-SGSN 

Data: Through S4 interface between S-GW and 3G-SGSN6 months ago• Like

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Follow Vinay SagarVinay Sagar Deekonda • @Shailesh:Is Blind Handover possible between a 2G(GSM) System and 4G(LTE) System??6 months ago• Like

Follow ShaileshShailesh chidrawar • Yes, I think it is possible, but not practically verified, 

[1] From S13 interface which connect between MME -> EIR->MSC6 months ago• Like

Follow SANDEEP MANISANDEEP MANI TRIPATHI • HI Vinay! 

As stated by other Experts, Blind HO menas without looking at HO criteria(Thresholds etc) UE take HO to the best availble neighbour cell(Inter-LTE or Inter System(WCDMA/GSM). 

it could be Inter-LTE, LTE to WCDMA or LTE to GSM.6 months ago• Like

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Follow Vinay SagarVinay Sagar Deekonda • @All: In the Handover scenario occuring via X2 Interface in LTE the eNodeB himself triggers the HO without consent of UE.Can we consider this HO as a Blind Handover ?? .6 months ago• Like

Follow NarayananNarayanan Moorthi • Hi all, 

eNB triggers handover at the time of load balancing without Measurement report from the UE.6 months ago• Like

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Follow SANDEEP MANISANDEEP MANI TRIPATHI • @Vinay: In case of X2, eNB triggers, HO based on UE measurements, reported cell and their RSRP level etc by the UE, explore what exactly you mean?6 months ago• Like

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Vinay Sagar Deekonda • @Sandeep : Earlier you said that Blind Handover is possible in Inter-LTE.In which particular scenario does Blind Handover takes place within LTE Network because in most of the cases Blind Handover takes place between two different systems rather than taking place within same system??6 months ago• Like

Follow SANDEEP MANISANDEEP MANI TRIPATHI • There is a threshold we define in LTE "th4", once serving RSRP reaches below this level, UE blindly get redirected to the best available Cell(Based on priority etc). here you may see dip in Tput and then it campup to next best available cell(Inter-LTE or Inter Rat). No databuffersing etc involved.6 months ago• Like

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Follow Vinay SagarVinay Sagar Deekonda • @Sandeep:So is this case applicable to LTE only or also Blind Handover can happen within GSM and within UMTS system also ??6 months ago• Like

Follow SANDEEP MANISANDEEP MANI TRIPATHI • I don't have experience on this within GSM/WCDMA, inter GSM/WCDMA and GSM/WCDMA towards LTE.6 months ago• Like

Follow SANDEEP MANISANDEEP MANI TRIPATHI • I have experience with 

LTE<---> LTE (Inter-LTE, may be deff frequency etc) LTE--> WCDMA (LTE towards WCDMA) 

LTE--->GSM, (LTE towards GSM) 

This type of handover is helpful when your defined HO criteria do not met or system is not supporting Inter-Rat HO(as workaround)6 months ago• Like

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Follow ShaileshShailesh chidrawar • @Vinay: Blind Handover happen to any wireless technology, like between GSM->WCDMA, GSM->LTE or LTE->WCDMA6 months ago• Like

Follow SANDEEP MANISANDEEP MANI TRIPATHI • Thanks Shailesh for your input, actually I did not come across Blind HO/Redirection towards WCDMA from GSM, towards GSM from WCDMA and WCDMA/GSM towards LTE. Could you please brief on this for better understanding for all of us, events, criteria involved, how does it happen.....(I have experience on thiswith LTE towards other Tech including CDMA/HRPD, LTE, FDDUTRA, TDDUTRA, GSM.etc)6 months ago• Like

Follow ShaileshShailesh chidrawar • B2 Event does that 

i.e. this event occus when Serving becomes worsethan threshold1 AND inter RAT neighbor becomes better than threshold26 months ago• Like

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SANDEEP MANI TRIPATHI • @Shailesh: Then this event we should not say Blind as UE is measuring Target?6 months ago• Like

Follow ShaileshShailesh chidrawar • @Sandeep: This is good catch.. 

We will ask other experts to comment on this, for blind HO which event should present6 months ago• Like

Follow MichalMichal Morawiec • Blind HO can can also happen within the same system. E.g. Blind HO is supported in WCDMA as IFHO also.6 months ago• Like

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Follow DanDan Birkett • From UE perspective, no measurement reports have been sent and the UE is redirected to any other Frequency or RAT without having previously measured/synchronised to the target cell. This is highly undesirable as it assumes the NW knows what it is doing, which is not often the case ;)6 months ago• Like

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Follow ZoharZohar Lazar • One more scenario is when you are doing national roaming and the home network doesn't have access to the NRP, the only thing that they are having is a neighbor list so a blind HO is performed ( this can be in the same technology or Inter-Rat).6 months ago• Like

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Follow VaibhavVaibhav Srivastava • Is it possible to get blind handover and Measurement based Handover at the same location?1 month ago• Like

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