9/17/2016How LTE Stuff Works?: Carrier Aggregation SCell Measurements 0 More Next Blog» [email protected] How LTE Stuff Works? Tuesday, October 21, 2014 Carrier Aggregation ‐ SCell Measurements In order to configure/add the secondary cell (SCell), the eNodeB can make use of measurement event A3 (Neighbour becomes offset better than PCell). Once an SCell is added to the set of serving cells (PCell + one or more SCells), the UE can perform measurements on the SCell (and on all the serving cells) without a need for measurement gaps. The Secondary component carrier may be activated and deactivated by MAC‐CE commands as explained in detail here. The applicable performance requirements depend on whether the SCell is activated or deactivated. When SCell is active, the requirements are similar to that of PCell. On the other hand, the RRC parameter measCycleSCell controls the measurement requirement when the SCell is in deactivated state. Measurement Event A6 The eNodeB always tries to configure the UE with best cell (radio conditions) as SCell, in order to increase the spectrum efficiency. This is only possible, if the UE can detect and report best cell(s) on the concerned SCell’s carrier frequency. None of the reporting events until Release‐9 are applicable for the UE to detect and report best cell on the SCell’s carrier frequency. A new measurement event A6 is introduced in Relese‐10 for Carrier Aggregation needs. About Me Measurement event A6 is defined as ‘Neighbour becomes offset better than SCell’ which is intended for intra‐frequency measurement events on SCell's carrier frequency i.e., event A6 compares the neighbor cell(s) and the SCell that are on the same carrier frequency (illustrated below). Blog Archive ► 2016 (5) ► 2015 (1) ▼ 2014 (22) ► November (3) Kumar Swamy Pasupuleti ▼ October (6) View my complete profile Multiple Timing Advances for uplink Carrier Aggreg... Cross‐Carrier Scheduling in Carrier Aggregation Total Pageviews Carrier Aggregation ‐ SCell Measurements 964,169 Carrier Aggregation ‐ Activatio and Deactivation ... Carrier Aggregation ‐ Seconda Cell Addition/Modi... RNTIs in LTE ► July (8) ► June (5) ► 2013 (1) ► 2012 (22) ► 2011 (58) The eNodeB, after receiving measurement report with event A6, will likely to release the old SCell and add the best reported cell in the measurement report as the new SCell. Event A6 is similar to event A3, but event A3 can be used for PCell (intra and inter‐ frequency) whereas event A6 is used only for SCell (intra‐frequency only). As a result of the addition of the new event A6, ReportConfigEUTRA in Release‐10 contains the following structure for event A6. http://howltestuffworks.blogspot.in/2014/10/carrieraggregationscellmeasurements.html 1/4 An example measurement configuration for event A6 is given here. pCell RSRP http://howltestuffworks.133 and 36. The UE shall remove the measId corresponding to event A6 from it's measurement configuration.html 2/4 . 2014 at 10:42 AM MAC Procedures (6) Hey Kumar. measurement gap (1) I have one question about "In order to configure/add the secondary cell (SCell). An example of measurement report event A6 from the UE is shown below. UE will send MR for sCell only when it will be offset better than pCell. This procedure is called as ‘Measurement identity autonomous removal’. The UE shall indicate the support for Measurement reporting trigger Event A6 in the field featureGroupIndRel10 (index: 111) in the IE UE‐EUTRA‐Capabilityv1020‐IEs.331 FeICIC (5) Reactions: Hetnet (4) Very Useful (0) ICIC (5) LTE Calculators (10) LTE Security (7) LTE System Information (10) Useful (0) Not Useful (0) More Like This Please (0) Posted by Kumar Swamy Pasupuleti at 2:32 PM Recommend this on Google Labels: Carrier Aggregation 8 comments: MAC PDU (2) Anonymous November 6. if the concerned SCell is not configured or released.in/2014/10/carrieraggregationscellmeasurements.9/17/2016 How LTE Stuff Works?: Carrier Aggregation SCell Measurements Supporting of event A6 is optional for the UEs. Labels Followers BSR (1) Followers (129) Next Buffer Status Reporting (1) Bundling (1) Carrier Aggregation (6) CQI (2) CRE (5) Follow CS fallback (2) CSG (1) CSI (1) DCI Formats (3) DRX (2) eICIC (5) The eNodeB configures the UE with event A6 only if the concerned SCell is configured. the eNodeB can make use of measurement event A3 (Neighbour becomes offset better than PCell)"? NAS (45) Periodic CSI (3) PHY (7) Are you sure that it is good solution to configure mentioned event to add sCell? I think it does not.blogspot. EMM (28) EPC (51) ESM (17) Reference: 3GPP TS 36. (let assume a3offset 4. the UE may end up having good sCell and but very bad PCell. 2015 at 6:50 AM Event A6 is similar to event A3. because criteria are not fullfiled) PHY Procedures (9) Resource Allocation (8) I think event A4 (Neighbour becomes better than treshold RSRP>105dBm) is proper to informs eNB about sCell (to trigger sCell addition). A6 is Not for inter frequency . I will reply soon. UE Identities (4) Similar to Handover. sCell 78dBm good signal area.. What do you think? Reply Anonymous November 7. but to avoid weak radio condition on pCell A3 is configured. To address the problem in your example. So when A3 (pCell mobility) and A4(sCell addition) are set up (with proper parameters) this is unlikely to have weak pCell and good sCell. the decisions for adding SCell may be based on relative RSRP of the PCell. Lucas Reply Replies SR (3) Kumar Swamy Pasupuleti SRS (2) Hello Lucas..9/17/2016 How LTE Stuff Works?: Carrier Aggregation SCell Measurements 80dBm.523) where 3GPP was using A3. To release event A2 can be used. because I am not familir with them. I mean if pCell becomes weak (new cell better then offset is found).. UE reports it and adds them. " Regarding above statement I agree with you. TTI Bundling (1) I think that A3 is still a good choice as compared to A4. The most important goal of adding an sCell is to increase the bandwidth so that throughput can be maximized. but even that no sCell will be added via RRC. that your statement is wrong. http://howltestuffworks.google. can a negative 'a3offset' be used? I have also checked in conformance test cases (36. Then if sCell is better then treshold. BR Reply koteswara reddy December 21.blogspot. Thanks. the UE may end up having good sCell and but very bad PCell.in/2014/10/carrieraggregationscellmeasurements. "If the decision is just based on results on SCell's frequency.html 3/4 . It is very important to maintain a good link quality on the PCell. 2014 at 12:11 PM Good point. It is very important to maintain a good link quality on the PCell.com/patents/WO2013169834A1?cl=en paragraph [0078] [0079]. Above explanation is based on live air implementation (many European operators). If the decision is just based on results on SCell's frequency. 2015 at 1:52 PM A6 is introduced for sCell Intrafrequency measurement purposes only. A3 could be used both for PCell and SCell interfrequency measurements. Timing Advance (2) November 6. Please take a look http://www. I do not say. RNTI (2) RRC (30) RRC Messages (30) Scheduling Request (3) Semi‐Persistent Scheduling (3) sps (3) Best Regards. *T&C I am going to check conformance test cases. Have a nice.?. 2014 at 8:51 AM Hi again.can any one explain why it will not support why A6 is only for intra Freq ANy reason Reply Replies Kumar Swamy Pasupuleti December 23. UE sends A3 and NW triggers HO (with release of sCell). but event A3 can be used for PCell (intra and interfrequency) whereas event A6 is used only for SCell (intrafrequency only). blogspot. SCell interfrequency measurement results are of not that much interest as PCell is the one which maintains the connection. http://howltestuffworks. Thanks Sanjeev Reply Haroon February 29. Reply Enter your comment.9/17/2016 How LTE Stuff Works?: Carrier Aggregation SCell Measurements Moreover. Or don't configure at all Reply Replies Kumar Swamy Pasupuleti March 1.. 2016 at 2:23 PM whats the downside if we don't configure A6 reporting on 2 Carrier CA site. 2016 at 6:49 AM Hi Experts. measurement gaps on primary frequency may be needed in order to measure sCellintra frequencies.html 4/4 .. Have you observed cases where UE gets A6 event detail in RRC connection Reconfiguration but even after condition fulfill doesn't rigger A6 event? I confirmed from FGI111 bit UE can support A6 event. 2016 at 11:04 AM If A6 is not configured.in/2014/10/carrieraggregationscellmeasurements. Reply Anonymous January 27. Comment as: Publish Biswajit (Google) Sign out Notify me Preview Links to this post Create a Link Newer Post Home Older Post Subscribe to: Post Comments (Atom) Powered by Blogger.