5G NR Link Budget Deep Dive - Dimension your own Link Budget With An Online Tool

[@OurTechPlanet]

For 5G Implementation, Design & Optimization, check out the complete playlist below :) 🌐5G Workshop Lectures - The Practical Approach to 5G Learning 💡kzbin.info/aero/PL4OXTttOk9WitKYbI_YRbMM5nneh2wpfk

[@lyy38]

Thank you for the good lecture. The attached content was also useful. If I were to create a virtual link-level simulator in 6G based on this, what would I need to modify?

[@OurTechPlanet]

Will look into it.

[@wilsonkimengich7427]

thanks for the presentation. On the calculator the antenna gains maximum is 25dBi. Is possible that you can allow gain up to, say, 50dBi so that we can see the impact of gains on the parameters ?

[@OurTechPlanet]

Thanks. Will look into the feasibility.

[@georgioskarouzos7418]

Very helpful! Is beamforming gain of an active antenna (64t64r) included in gNB antenna gain? Thank you

[@OurTechPlanet]

No, that is separately added

[@kozhenidres314]

thank you for this valuable presentation i have some questions if anyone could answer i really appreciate it 1. maximum transmit power of gNb of different bands (below 1Ghz , c band and mm wave) ? and how it changes with MIMO technology ? does it changes by employing different levels of MIMO ? and who decide for maximum transmit power of 5G NR ? 2. how to know UE sensitivity level in dBm ? i.e how much is IPHONE 12 series sensitivity ?? and for base station sensitive for uplink calculation ? are they provided by vendors ?

[@OurTechPlanet]

Yeah I would say that you should get this from the vendors!

[@marcosmas28]

Hi Ali, thanks for sharing your knowledge and online tool! I have one question: How can you calculate or estimate the Throughput at Cell Edge and the Throughput at Ue distance from gNB (d2D)?

[@AliAsgherMansoorHabiby]

Hi Marcos, Thanks a lot for your patience and watching the video :) I am sure that you are aware that Throughput is not a function of Distance alone. There are parameters involved including bandwidth, assigned RBs, Control channel overheads, Numerology used, Scheduling and more. So, I would suggest below approach to answer your question. For the Cell edge calculated by the Link Budget, remember that the cell edge is the location where the receiver sensitivity is the bottleneck. This means that you need to calculate throughput at MCS = 1, IBLER = 10%, Your numerology, Your bandwidth, Your settings etc. So, you can go to nrcalculator.firebaseapp.com/nrpracticalthroughput.html . Then select RANK = 1, MCS = 1, IBLER = 10% and your numerology. This would be your throughput at Cell Edge. Example, MCS = 1, IBLER = 10%, RANK = 1. Throughput = 15Mbps. So this would be the throughput at the cell edge calculated by the NR Link budget calculator. Now, to the second question where you are asking for Distance vs. Throughput. This is not an easy question because throughput is not a sole function of distance. Usually, this is done using past experience (Drive test values for experience etc.). I dont have a calculator ready for this task yet, but I think what you may do is to be able to interpolate the throughput between the Peak Throughput of your system (nrcalculator.firebaseapp.com/nrthroughput.html) and the Cell Edge Throughput based on the distance of cell edge. (Consider best throughput at 20th percent of total cell range, worst at the link budget cell edge and interpolate based on distance. I hope this helps in your estimation. Regards, Ali

[@marcosmas28]

Hi Ali, thanks for your answer. Ok, I understand the first approach to calculate the cell edge throughput. It makes sense for me. Now, for the second case, with the curves in your link budget tool we can calculate the Rx Power level at d2D, then I would like to know how to correlate that RxPower to a new SINR ir CQI value and therefore to a new MCS and RANK to get the throughput at d2D. Am I wrong with this approach?

[@AliAsgherMansoorHabiby]

@@marcosmas28 No. Your idea is perfect. We need to get data relevant to your network (like the bandwidth used, numerology etc) from drive test where we can build a RSRP vs. Throughout chart based on Network average values. This way, you can estimate the throughputs. Unfortunately, I only have such data for limited scenarios (100Mhz only, 3.5 GHz band only etc.) And so I don't have a ready made calculator for this part.

[@marcosmas28]

Hi @@AliAsgherMansoorHabiby, we haven't deployed the network yet. Nowadays, I'm trying to estimate the maximum d2D that satisfies a minimum throughput for a specific use case in 3.5 GHz band with 100 MHz BW. That's why I'm asking how to estimate RSRP vs Throughput at least for the initial planning and design phase.

[@AliAsgherMansoorHabiby]

@@marcosmas28 Personally, I dont believe that this is the right approach. However, in the grand scheme of things, if you want high level estimations, then I will give you a ML model based on following parameters. BW = 100 MHz u = 1 (30Khz) Test Type = Multiple Socket, Stress Testing Downlink Band = n78 Scheduler = Multi-vendor Scenario 1: If Inter-site distance for 5G is low, then RSRP is the SSB RSRP. NR Physical Throughput = 15000 * NR_RSRP + 1.7936e+06 Scenario 2: If Inter-site distance for 5G is moderate, then RSRP is SSB RSRP NR Physical Mean Throughput = 10691 * NR_RSRP + 1.31722e06 For statistical relevance, the adjusted R-Squared value for the 1st model is 0.30 and the second model is 0.36. Considering that throughput is NOT a sole function of RSRP, this R-Squared value is actually quite good. I sincerely hope that this helps you in your quest. Regards, Ali