Great video. Questions: 1. What is the threshold to consider a slot full or it does not matter and it is always excluded if is not totally full? , and 2. when one occupies more data in the slot the UE time is considered as 1 and not 2 (min 14:27)?
1. Yes, if the slot is not totally full , it is not considered 2. The UE times was considered as 1 because, for the other UE, it was the last slot. So Last Slot definition is applied per UE.
@@OurTechPlanet ok but you have also mentioned that if any slot is not full we will not take that slot into account for ue throughout like here 9 kb is used by ue1 and rest 1kb we are not taking into account due to second ue last tti. so do we include that 9kb slot to calculate ue throughput or not..?
The examples are in KBs but the time in examples is also in slots and each slot is 1 millisecond. So, the end throughput result would be kilo bits per millisecond. To convert this into mbps, we convert kilo bits to mega bits by dividing by 1000 and we convert milliseconds to seconds by multiplying by 1000 so end result is that kilo bits per milliseconds = mega bits per second
Retransmission slots should not be considered in data, however, the time should be counted. But Cell Throughput mechanism can be implementation specific.
Great video! I'm doing a project for a 5G satellite constellation design, and I'm struggling to estimate how much actual usable/sellable data I can get from my total transmittable data. I don't have a background in telecommunications engineering, (this is for a space engineering Master's program). So if my link can support 1Gbit/s of information for example, how can I work out what %of that will be taken up by headers, and retransmissions etc. I know it likely depends on a lot of things, but all I need at this stage is to find a rough estimate. Thanks
This will depend on the protocol and configuration being used but if we are using TCP then we will have an IP header and a TCP header and usually this would amount to around 40 bytes per packet.
@@OurTechPlanet Thanks for the response! When I search 5G protocol stack, it doesn't seem to involve TCP/IP, but rather MAC, RLC, PDCP, SDAP. Or am I misunderstanding something? Maybe a better way of putting my question: How can I estimate or model the header/overhead as a % of the average packet size? Thankyou for your time.
@@Elliot_97 Actually 5G is a medium which carries application packets. Application packets are based on application protocol and as I gave an example of TCP/IP which is one of the common protocols. The biggest header is usually the TCP/IP. The PDCP/RLC headers are too small in comparison.
1. By not slot not fully utilized you mean that Last TTI in simpler terms and in that WhatsApp Message example every transmission is like one TTI/Last TTI? 2. A rather common query, when a Cell is split (Twin Beam), Cell Throughput usually decreases, is it because data is divided between cells but time consumed is same so numerator becomes small?
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I had some confusion in these 2 throughputs form long time, its very much clear now , Thanks! keep posting more .
Thanks for the comment. It is great to hear that we could help :)
Thanks for the quality content.
Thanks :)
Brilliant analysis 👌🏻
Thanks
Great video. Questions: 1. What is the threshold to consider a slot full or it does not matter and it is always excluded if is not totally full? , and 2. when one occupies more data in the slot the UE time is considered as 1 and not 2 (min 14:27)?
1. Yes, if the slot is not totally full , it is not considered
2. The UE times was considered as 1 because, for the other UE, it was the last slot. So Last Slot definition is applied per UE.
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14:24 in the second last slot , even though two UEs data are present but TIME(UE THP) is equal to 1.why ?
That is because for the orange UE, it is the last TTI. And last TTI for a UE is not pegged in the throughput KPI as per 3GPP.
@@OurTechPlanet ok but you have also mentioned that if any slot is not full we will not take that slot into account for ue throughout like here 9 kb is used by ue1 and rest 1kb we are not taking into account due to second ue last tti. so do we include that 9kb slot to calculate ue throughput or not..?
@@pawanagarwal4307 Yes, good catch Pawan. We will take 9KB into account for UE THP as it was not last TTI for UE1.
Nice one🎉
Thanks 🔥
Question: Same definitions are used for UE and Cell Thp. by 3GPP for LTE too?
Yeah, the theory is pretty similar.
For all examples volume in KB but how come Thrp. in Mbps??
The examples are in KBs but the time in examples is also in slots and each slot is 1 millisecond. So, the end throughput result would be kilo bits per millisecond. To convert this into mbps, we convert kilo bits to mega bits by dividing by 1000 and we convert milliseconds to seconds by multiplying by 1000 so end result is that kilo bits per milliseconds = mega bits per second
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Cell throughput considers retransmission slots?
Retransmission slots should not be considered in data, however, the time should be counted. But Cell Throughput mechanism can be implementation specific.
Is same concept & logic applied to LTE Cell & User Throughput consideration?
Yes , more or less, the concept is similar!
Great video! I'm doing a project for a 5G satellite constellation design, and I'm struggling to estimate how much actual usable/sellable data I can get from my total transmittable data. I don't have a background in telecommunications engineering, (this is for a space engineering Master's program). So if my link can support 1Gbit/s of information for example, how can I work out what %of that will be taken up by headers, and retransmissions etc. I know it likely depends on a lot of things, but all I need at this stage is to find a rough estimate.
Thanks
This will depend on the protocol and configuration being used but if we are using TCP then we will have an IP header and a TCP header and usually this would amount to around 40 bytes per packet.
@@OurTechPlanet Thanks for the response! When I search 5G protocol stack, it doesn't seem to involve TCP/IP, but rather MAC, RLC, PDCP, SDAP. Or am I misunderstanding something?
Maybe a better way of putting my question: How can I estimate or model the header/overhead as a % of the average packet size?
Thankyou for your time.
@@Elliot_97 Actually 5G is a medium which carries application packets. Application packets are based on application protocol and as I gave an example of TCP/IP which is one of the common protocols. The biggest header is usually the TCP/IP. The PDCP/RLC headers are too small in comparison.
Nice Bro
Thanks
Great videos as always. Can you also make layer 3 analysis via Actix for 4G mobility b/w 3G and 5G
Yeah it can be done, the problem is to get hold of the log files. It is not easy to get free drive test log files to use.
Why in 9th slot when gNB transmits 1 KB to UE 2 and 9 KB to UE 2, when don't consider time as 2, is there any reason(threshold) something....?
because it is last slot for UE2 and last slot is not pegged in time for user throughput
How is Potential Throughput different than these two ?
What do you mean by "Potential Throughput"?
1. By not slot not fully utilized you mean that Last TTI in simpler terms and in that WhatsApp Message example every transmission is like one TTI/Last TTI?
2. A rather common query, when a Cell is split (Twin Beam), Cell Throughput usually decreases, is it because data is divided between cells but time consumed is same so numerator becomes small?
For the first one, the answer is Yes
For the second one, I am not really sure about this one.