The GPS availability is reported as A or calculated in percentage value as. User Count Based or Flow Control Based RRC Rejections, Different baseband boards and vendors have different limitations on active user count and CAPS (Call Attempts Per Second). Any observation on this? Since, it is only around 7 bytes, it will need a small number of RBs so power per carrier will be high. The eNB pegs RRC attempt counter when it receives the RRC Connection Request and the process is deemed successful on the receipt of the RRC Connection Setup Complete message. Still it can vary from network to network based on TAC planning and mobility strategy. Such a case is pegged under call, The most common issue for this kind of failure is, that when the UE initiates handover on the target cell, radius. Int. Google Scholar, Li, X.J., Chong, P.H.J. 5G Call Flows and Signaling - How a 5G UE performs Initial Access; KPI Optimization: LTE ERAB Success Rate; SFP Transceivers Explained; KPI Optimization: LTE Call Drop Rate; LTE Throughput Optimization: Part 2 - Spectral Efficiency IEEE J. Sel. thank you a lot for your help. However, this RRC ReEstablishment can also be sent to another cell from eNB2 that does not belong to the source eNB (eNB1). The eNB1 will consider this a MME induced drop since the eNB1 still holds the UEs, Do not sell or share my personal information. of all dlTrafficVolume reported for the RSC in a given interval of reporting time. @Ali khalid. But you should be able to find it under connection management related documentation. I have one question in mind Why HFN is used in SN transfer during handover why cannot we use SFN. i have one concern related to ANR in LTE. This video is the third session in LTE KPI Optimization series and explains the LTE ERAB Drop Rate KPI. Please post related ERAB Setup success rate & Call Setup Success rate. White paper, February 2009, Balapuwaduge, I.A.M., Jiao, L., Pla, V.: Channel assembling with priority-based queues in cognitive radio networks: strategies and performance evaluation. The Call Drop Rate is ratio of total abnormal releases to the total releases. http://cwi.unik.no/images/c/c3/SON_white_paper_NSN.pdf, Dahln, A., Johansson, A., Gunnarsson, F., Moe, J., Rimhagen, T., Kallin, H.: Evaluations of LTE automatic neighbor relations (2011). Consider that UE is static (for simplification) so what actually happens for the same UE if Cell Radius of Target Cell is increased. If the UE is unable to decode PDCCH in DL for N310 consecutive intervals, the UE will initiate a RRC ReEstablishment. Hi Ali, RLC retransmission threshold to a higher value might also help in reducing this issue. You should look into the counters for HO failure due to MME, that should show you a more realistic picture. great info. Thanks for good explanations. T302 should be increased to limit the RRC signalling load. . UE detect RLF and indicated to Enb. For example following TMSI are appearing To calculate per venue/system, use of all RSCs. 16, 858874 (1998), Lobinger, A., Stefanski, S., Jansen, T.: Coordinating handover parameter optimization and load balancing in LTE self-optimizing networks. Please follow the link below and post your question/feedback in Youtube comments section so that Ali Khalid will be able to answer. The most common KPIs which can be based on either network statistics or drive testing are random access setup success rate, call setup success rate (CSSR), evolved radio access bearer (ERAB)drop rate and intraLTE handover success rate. (PDF) Huawei LTE_KPI Optimization | adarsh singh - Academia.edu 2, 411415 (2010), Lin, Y.-B., Mohan, S., Noerpel, A.: Queuing priority channel assignment strategies for pcs handoff and initial access. Such a UE will initiate a RRC ReEstablishment procedure to regain its radio link. The UE goes to idle mode, Rate is ratio of total abnormal releases to the total normal releases. IFDA is Indias no 1 Computer Institute. should be to the total releases. Consider a UE that experienced RLF due to maximum number of uplink RLC retransmission. 5G NR | VoLTE | LTE-A | Massive MIMO | NB-IoT | NDO Network Specialist at Ericsson, Australia. The RRC Connection message is usually around 7 bytes in length while the RRC Connection Setup Complete message may contain the whole NAS information (like TAU or Attach Request) and its size can vary from as small as 8 bytes to as big as over 100 bytes. Abstract and Figures. So, the target cell fails to decode the dedicated RACH properly for this UE and it results in a handover failure. LTE KPI Optimization (Session 3): LTE ERAB Drop Rate Ourtechplanet Com Kpi Optimization Lte Call Drop Rate | PDF - Scribd Most of the failures in the RRC stage are due to no response from the UE. But for the former the power per carrier will be less as it required more PRB. Keep writing Ali bhai. IEEE Trans. : A bandwidth degradation technique to reduce call dropping probability in mobile network systems. But if you do not have TMSI and the logs show a Random Value then it may or may not be the same UE. Now this RRC ReEstablishment can be to the serving cell and in that case, it is usually successful since the serving cell already has the UEs context. In, such cases, either forbid handovers to such cells, response from the UE. I want to ask eutran generated abnormal releases consist mme induced drops which radio and pdcch decoding failure? However, if the UE fails the handover then it tries RRC ReEstablishment after T304 expires and if that also fails then the UE will try a new RRC Connection. This approach solves the issue completely. As the Later have small size ,less PRB only required. Increasing, RLC retransmission threshold to a higher value might also help in reducing this, Consider a scenario, where UE tries to per, wait for a specific time as per T304 and once T304 expires, it will initiate a RRC, ReEstablishment with the cause value of Handover failure. In case of any queries or feedback, please drop a comment below and I would love to respond and help. Your email address will not be published. To calculate average cell availability for plots, compute and display cell availability on the charts/plots (if possible) or the reported Cell unavailability time. B = Number of additional E-RABs successful to setup. The expiry of this timer means that the UE has been inactive for some time and the eNB releases it. So, if the message size is big for uplink, then its power will be distributed on more PRBs reducing the overall power per PRB and the decoding probability at eNB. Thank you . of all ulTrafficVolume reported for the RSC in given a interval of reporting time. Usually Mo-Sig RRC Success Rate is lower than others. Brother kindly please also Publish on MOCN( Multi Operator Core Network) / E-UTRAN Sharing. Identify Non-RAN Issues How to find Backhaul or Core Network Issues. For instance, if the value of N310 is increased from 2 to 6 and T310 is increased from 500ms to 1000ms, then the UE will wait longer and there is more chance that N311 will be triggered. So, in this case, either increase the cell radius of the target cell If you have any questions or feedback regarding this article, simply drop a comment below. This is because Mo-signalling RRC Request is usually used for NAS signalling messages like Attach Request or Tracking Area Update Requests. Like other KPIs, the call drop is also divided into two broad categories. is successful International Conference on Futuristic Trends in Network and Communication Technologies, FTNCT 2018: Futuristic Trends in Network and Communication Technologies For example, users sending CQI with an interval of 10ms will be shifted towards 40ms in order to increase the capacity of the PUCCH. If the UE initiates a new RRC connection before the source eNBs X2 Reloc Overall Timer expiry then it will be pegged under MME drop while if the UE is unable to initiate a new RRC Connection in time, the source eNB will release the context due to X2 Reloc Overall Timer expiry resulting in a radio drop. The cell is part of at least one TA that is not part of the list of forbidden tracking areas for roaming which belongs to a PLMN that fulfils the first bullet above; Usually, Mo-Signalling is around 20 to 25% while Mo-data has the highest percentage. Based on this request, the eNB sends a RRC Connection Setup message which contains the information of SRB and some basic radio parameters like power control, SRI & CQI periodicity. Mobility Load Balancing is another feature that can help in such a scenario by moving users away from the congested carrier to another less utilized carrier. arXiv:1707.09300v1 [cs.NI], 28 July 2017, Gacanin, H., Ligata, A.: Wi-Fi self-organizing networks: challenges and use cases. Mj suhc hfsks, kmtckr `drome cfjedvkrs td suhc hklls dr fee d``skts, rkspdjsk `rdb tck [K. M` tck [K edks jdt skje f, bkssfik td tck kJO fje tck mjtkrjfl tmbkr dj tck k, tckj vkrm`y tcft tck kJOs mjtkrjfl tmbkr ms jdt skt td f v, Wdmjt td jdtk ms tcft __H _khdj`miurftmdj `dr bdomlmty hdbbfje ms kx, Do not sell or share my personal information. Thats because is not a rule that one HO Failure will become in one dropped call, maybe the cell have other candidates to make the HO or maybe the UE recovers from the bad signal condition that depends on the RF environment. However, such users keep trying again and again impacting the KPI. AOA Ali bhai, This implies that the UE could try re-establishment only once after the procedure is triggered. Lets understand with an example. And reason would be ? Looking forward for more. Consider a scenario, where UE tries to perform a handover and fails. So, the target cell fails to decode the dedicated RACH properly for this UE and it results in a handover failure. What is the particular cause for the LTE call drop with respect to Modem/UE? Consider a scenario, where UE tries to perform a handover and fails. Please keep posting for further KPIs too. KPI Optimization: LTE Call Drop Rate: Common Causes For Call Drops - Scribd Hi Ali, if you know nokia parameter for rlc retransmission, Hello ali, UE will keep on sending Service Request to resume Radio connection post detecting RLF and Enb will act on this request by passing SERVICE request to MME and established Bearers. However, if the eNB2 is not a neighbor then it will reject the RRC ReEstablishment. Divya Mishra or Anuranjan Mishra . ( Like for 20MHz , total power distributed over 1200 subcarriers ). Ever, improve this KPI and it has become more important in, In simple words, a call drop in LTE means that a users ongoing session is dropp, an abnormal release which is verified from the cause code inside the Context Release, Like other KPIs, the call drop is also divided into two broad categories, The most common drop pegged under Radio issues is the drop due to RLC retransmissions. Thanks very much and looking forward to your reply. If N311 is 1 then it means that UE needs 100ms of successful PDCCH decoding to stop T310. Kvkry jktwdrn, mbprdvk tcms NWM fje mt cfs okhdbk bdrk mbpdrtfjt mj LUK smjh, PdLUK. PDF International Journal of Innovative Technology and Exploring - IJITEE J. Electr. Is it easy for them to obtain or run drop call data? The reason is once again linked to the size of the MSG-5 (RRC Connection Setup Complete). C = Number of initial E-RABs successful to setup. It might be inferred from the RRC counters as well since the number of failures are relatively same in consecutive intervals. The following procedures are usually used based on different scenarios, Conventional Method : Physical Optimization. Hello Mahmoud, One of the most important KPI is the LTE Call Drop Rate. This is because each slot has PUCCH RB allocation on both ends of the band so that means that each slot will have atleast 2 Resource Blocks for PUCCH one at the top of the frequency band and the other at the bottom of the band. can you explain about that timer. Hi Ali, Excellent article covering all call drop problems in detail. optimization steps are required to provide similar or better drop rates with VoLTE as with CS voice. However, this can increase the signalling load as idle users can try to come back to network more frequently which can increase CPU usage of the eNB. 5G Call Flows and Signaling - How a 5G UE performs Initial Access; KPI Optimization: LTE ERAB Success Rate; SFP Transceivers Explained; KPI Optimization: LTE Call Drop Rate; LTE Throughput Optimization: Part 2 - Spectral Efficiency Hi, You can go through it on the following linkhttps://ourtechplanet.com/lte-erab-success-rate/. Depends on the UEs coverage at that moment. The total power is distributed equally for downlink but for uplink each UE does not get the full 1200 SC (20Mhz example). This is the most common RRC failure which is present in every network. Such a case is pegged under call. But the user perception can be impacted so it should be tuned accordingly. Xd, tck tfrikt hkll `fmls td ekhdek tck, fje mt rksults mj f cfjedvkr `fmlurk. If it is a single UE issue then from RRC trace, inside the RRC connection request, look for its identity. Some vendors wait for a, bit longer (an internal timer) for the UE to initiate RRC ReEstablishment and if there is no, RRC ReEstablishment then the eNB will release abnormally and radio induced call drop will, The difference between the DL and UL RLC Retransmissions is that in case of DL, retransmissions, the eNB knows that the UE has lost the radio connection, so it can release, the resources and peg a radio induced call drop. Thanks for sharing ,it is very useful and easy to understand. RRC Rejections due to PUCCH congestion can be solved by simply increasing the PUCCH Resource Blocks. What tools can we use? Some vendors initiate a UE Context, bit longer (an internal timer) for the UE to initiate RRC ReEstablishment and if there is no, RRC ReEstablishment then the eNB will release a, The difference between the DL and UL RLC Retransmissions is that in case of DL, retransmissions, the eNB knows that the UE has lost the radio connection, so it can release, the resources and peg a radio induced call drop. If yes , can you over ANR as well But in case of UL RLC retransmissions, the, eNB usually does not know that the UE has reached RLF conditions and will only find this. Nagar, Noida, U.P., India, You can also search for this author in Thank you sir for your valuable information, which gave me good knowledge in lte kpi troubleshooting I would like to know more on CSFB, SRVCC, volte KPI troubleshooting tips if possible. Usually such a limit is either a license issue or a board capacity issue. : Call dropping analysis in a UMTS/WLAN integrated cell. Then, What message will trigger if authentication failures. when the ue experience a drop due to MME what is the common drop raison in signaling. Your email address will not be published. Excellent post. LTE KPI Optimization (Session 3): LTE ERAB Drop RateThis video is the third session in LTE KPI Optimization series and explains the LTE ERAB Drop Rate KPI. So, let us get started without wasting any further time. LTE RRC Success Rate https://youtu.be/TbgOBoD7cNQ. The causes of LTE drops are also covered in detail along with actions that can resolve those issues. Key Performance Indicators (KPI) and parameters such as Call Setup Success Rate (CSSR), Call Completion Rate (CCR), Call Drop Rate (CDR), and Call Handover Success Rate (CHSR) were considered and . LTE KPI Optimization (Session 2): RRC Success RateThis video is the second session in LTE KPI Optimization series and explains the LTE RRC Success Rate KPI.
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