Sharetechnote 4g throughput

Sharetechnote 4g throughput. This is from one of the most famous rule in communication theory called Shannon's law. Learn about 4G DCI formats, fields, and decoding methods with clear diagrams and examples from ShareTechnote , a reliable source of wireless technology. Let's take a high level view of several LTE features of LTE in terms of the two aspects, reliability and throughput. Som UMTS - CQI vs Throughput . For the high level description of NB-LTE and some comparative view of other technology, refer to LTE-M/Category M/M1/M2 page. SDR. g, over 100 Mbps), single file transfer at a time may not be enough to achieve max throughput. 211 for FDD LTE is as follows. TDD throughput calculation is very similar to FDD case as you see below. Amarisoft TechAcademy. MCS and Modulation Order . As in other layers, let's start looking into the diagram from 3GPP specification (TS 36. But in a very high throughput configuration (e. The difference between MIMO and Carrier Aggregation. The key difference is 'number of subframes /sec' parts as marked in red. Another difference is about TBS each subframe as marked in blue. Realistic LTE Performance (from Motorola) Field Trial for LTE This site is for everything on 4G/LTE. Early July in 2016 (around Jul 10), the first version of 3GPP TS documents on NB IoT were posted and I started working on note based on these docum 2 CC Aggregation - 2x2 MIMO, Cat 3, 40 Mhz Aggregated BandWidth, 200 Mbps Throughput at IP layer 2 CC Aggregation - SISO, Cat 4, PUSCH enabled : HARQ Ack/Nack is carried by PUSCH 2 CC Aggregation - SISO, Cat 4, PUSCH diabled : HARQ Ack/Nack is carried by PUCCH Format 1b Throughput Calculation - TDD . it would become much complicated . With LTE Category 6 or higher, the max throughput is 300 Mbps or higher. The illustration and comments would need to be changes if the test condition gets different. LTE level throughput (e. Putting it Opinion 1 : I know the ideal max throughput is 100 Mbps, but I think it doesn't make much sense at least for a mobile device because in live network, you would never be in such a situation where a network allow such a huge resource allocation for any single UE and Radio Signal Quality also would not be good enough to achieve those throughput N1 mode simplifies the architecture with a common core for different access types. Config 1) Activate Cell Physicall Layer MAX Throughput . Tech. The practical throughput may vary widely depending on DL / UL Check-up before test . If you know the MCS index and number of RBs, you can calculate the throughput for that specific MCS idex and RB as follows: PHY layer throughput in bits = Transport Block Size (bits) / subframe. Carries user specific data (DL Payload). x Number of the scheduled subframes / sec. The most important factors to determine the ideal throughput are as follows : Number of RBs; MCS (Modulation Coding Scheme) which determines I_TBS; MIMO or SISO; The way to calculate the ideal throughput using these factors are explained in "Throughput Calculation Example" in Quick Reference page. Following is the over protocal sequence being exchanged between UE and Network. The throughput at the last step in the process can be defined as physical layer throughput. Make it sure that your USB on the device and the server PC support enough throughput capacity for this kind of test. 64 QAM UL . and tooooooooooooo confusing (at least very confusing to me). Normally this index changes for each subframe, meaning that even the same PDCCH data (e. I think the first video only would give you a lot of insight and troubleshooting tips b Why do you need this kind of special technique ? Does this mean that current LTE cannot achieve such a low throughput ? Of course there is no problem with the current LTE to work for such a low throughput application. E-UTRA sampling rates for the background information for this table. This is the first message from UE to eNB when you power it on. In NR, there are roughly two large frequency range specified in 3GPP. The throughput for a device working in a live net This site is for everything on 4G/LTE. We 4G/LTE - Measurement Report NOTE : At high level view, it would not be difficult to understand overall concept of CSI. The logging tool should be a MAX Throughput . Common Profiles . In any technology Recently as LTE Category goes higher, USB specification tend to become the bottleneck of the throughput. If you are interested in 3G throughput, refer to this note . LTE - Throughput in Live Air . Simply put, the code rate can be defined as the ratio of the data rate that is allocated for a subframe and the maximum data rate that ideally can be allocated in the subframe. 3G throughput (i. It only shows the structure of one frame in time domain. . UE Category is the set of information (parameters) that defines the maximum throughput for a UE. If you look at the table carefully, you would notice that the modulation parameter is Q'm (Q prime m), not Qm. g, UDP, TCP), there are several critical steps to go through. 323). Overall trend that you can easily notice and is easily understandable is Some features are more focused on the reliability issues and some features would be more focused on throughput issues. This is the most important item UE has to measure for cell selection, rese Throughput Calculation - TDD . What is Ideal/Expected throughput ? One of the most common questions that I have been getting for the past 10 years or so (probably from early HSDPA period and all the way up to now) was 'I have a UE with such and such category, what kind of throughput I need to get from this device ?' (Usually they carry the document like 36. This site is for everything on 4G/LTE. +-Peak throughput ::= CHOICE This site is for everything on 4G/LTE. For many people working in LTE, one of the most important question would be what is the maximum throughput for a network, device or network operator. not my tool, but I think all of these tools are based on the fornula in 3GPP as summerized above. Code Rate . Just in terms of theoretical throughput, M1 Downlink Max throughput is same as DL Category 0 which is 1 Mbps, but considering the repetivity scheduling, MPDCCH and PDSCH in separate subframes, Half Duplex operation, it will not be easy to achieve this throughput. The practical throughput may vary widely depending on DL / UL LTE RACH in Details . I think everybody would know what MIMO is. I got the log captured by the tool and exported the data as csv file and then plot it on Microsoft Excel. 4. (It would be a little bit tricky to draw a line between profile (A) and (B) because it would be difficult to achieve very high data rate without This site is for everything on 4G/LTE. e, simultaneosly) to achieve very high data throughput. Concept; Overall Configuration and Procedure; Mathematical Modeling of MIMO In relatively low throughput, it would be enough to download/upload only one file at a time to achieve the max throughput. But in case of Cat 4 or higher, it would be harder to achieve max throughput with CFI value 2 or 3. Followings are topics that will be covered in this page. ii) Low throughput does not necessarily mean low CQI. 306 with the tables showing 4G/LTE - Protocol Stack MAC I would be almost impossible to explain everything about LTE MAC in a single column without making it a thick book or without making everybody falling in sleep since MAC is the center of all LTE procedure. 4G/LTE - Timers T300 : This site is for everything on 4G/LTE. This throughput often get configured with the throughput calculated at the last step of this process. Example 1 > PHY throughput and RLC Throughput in a drive test Following plot is from the data captured by a drive test tool Azenqos Drive Test tool (AZQ Android) . Ping Path from UE PC to Server PC : CCE Index Calculation . g, 100 Mbps and over) is pretty tough task not only for IP stack, but also the IP application software and CPU utilization. S1 mode retains the overlapping 4G and 5G cores. Drive Test . Let's get into further details for some of the important parameters. 4G/LTE - Access Control Quick Reference Access Confrol (ac-Barring, SSAC, EAB, Cell Barring) This throughput often get configured with the throughput calculated at the last step of this process. In this section, I would focus more on L1/PHY layer performance test rather than IP layer throughput. HOT KEY Throughput TechSlide Flashcard . It is an essential part of wireless communication systems, including 5G(NR), 4G (LTE) and even 3G(WCDMA). Recently as LTE Category goes higher, USB specification tend to become the bottleneck of the throughput. That correlation can be expressed as follows. RACH stands for R andom A ccess Ch annel. For simplicity, I only implemented the high throughput path as indicated by red arrow below. Note : Refer to TS 36. 4G/LTE - BSR BSR(Buffer Status Report) BSR is a kind of MAC CE from UE to Network carrying the information on how much data is in UE buffer to be sent out. HSPA Throughput Summary . So, it is very likely that you would see low CQI when you see throughput drop in livenetwork test. Downlink Power Allocation . But I want to show you overall correlation between RLC throughput and Physical layer throughput. Search Home Community. 5G UE The simplest definition of performance test would be "to test if UE achieves maximum throughput at each and every layer". 4G/LTE - DRX DRX (Discontinuous Reception) - CDRX (Connected Mode DRX) Even while there is no traffic between the network and UE, UE has to keep listening to Network. g, wlan, V2X, NR etc), the list of SIB is getting longer and longer. The first diagram The illustrations shown here are examples for a specific case (typical max throughput condition). NB-IoT . 1. Example 1 > Throughput, CQI, BLER while driving on a highway This site is for everything on 4G/LTE. We are doing various kinds of throughput related test in the lab, but the most meaningful test is to test in the field like downloading / uploading files in out doors sometimes walking along the street or in driving because those are most closes related to real user experience. g, QPSK, 16 QAM, 64 QAM, 256 QAM). Comm. Just for this throughput issues, let's just focus on TTI, TBS 4G/LTE - LTE NB SC-FDMA Signal Generation According to my experience, the value specified in 36. The plot showing at the top (labeled as 'PHY Transmission Rate') is the amount of data being transmitted per second by PHY layer of the transmitter. Overview - FDD : Frame Structure Type 1. in this case most of UE fails at PDSCH decoding and report HARQ NACK causing PHY layer retransmission. TCP Throughput Links. This page will explain about various aspect of Measurement Process that is happening in a LTE. In this case, you may try transmitting/recieving multiple files simultaneously. 211-Table 6. Since the throughput process get involved in the full protocol stack and one/two PCs, and in addition IP tools, you would need to have tools to monitor each and every steps along the end-to-end data path. As LTE evolves, the length of UE category list gets longer and longer, and the interpretation of the category gets more complicated, you will need to go through many tables listed below to figure out the exact throughput capability of a UE. 5G FR(Frequency Range) / Operating Bandwidth in Detail. NOTE: This illustration is just to give you the big picture of how 4G/5G RAN connected to each other and how they are connected to core network (EPC). Live Air Throughput General Test in Real Life Drive Test This site is for everything on 4G/LTE. According to my experience, it would be relatively easy to achieve the optimum throughput for medium range of throughput (e. In other words, it means "The code rate is defined as the ratio between the transport block size and the total number of physical layer bits per subframe tha This site is for everything on 4G/LTE. It implies that PC performance or PC configuration can be a bottle neck for throughput test (especially HSDPA Category 8, 10 case). Troubleshoot Tools . In many cases, I had been asked to be on-site saying "SOMETHING is NOT WORKING" (These two words are what we most frequently use, but most ambiguous word. Release the unlicensenced and fall back to anchor carrier when the demand for unlicenced band is not critical. Basic . Even before you try any throughput test (e. One thing for sure for 5G would be that the required data throughput for 5G will be much higher (probably tens of Gbps) than 4G. e, HSPA) is determined by a little bit different set of factors(parameters) but I would focus more on 4G/5G throughput. 228 which is mainly for IMS for LTE and 5G specific details are provided as an appendix (Annex Y). Ping Path from UE PC to Server PC : 4G/LTE - Throughput Throughput Calculation - From UE Cateogory For many people working in LTE, one of the most important question would be what is the maximum throughput for a network, device or network operator. So, in stead of directly jumping into max throughput test, increase the throughput step-by-step and check CPU utilization (e. 3. The plot in the middle (labeled as 'PHY throughput with HARQ ACK' is the amount of data getting ACKED per second from the reiever PHY layer. NB-LTE stands for Narrow Band LTE. NOTE: Refer to 3GPP 36. The highest level view from 36. 4G/LTE - Throughput. Just from this single capture, it is hard to understand how each of the RLC parameters influencing the final throughput. Throughput Calculation - TDD . 4G/LTE - Measurement Multi Cell Measurement . I think I need to admit that I don't have enough experties to fill in this section, but I think I can some references that I found very useful. CoMP . RF. Following is the mapping table for PUSCH (Uplink). Basically this says "Use the unlicensed band only when it is really necessary (e. Opinion 1 : I know the ideal max throughput is 100 Mbps, but I think it doesn't make much sense at least for a mobile device because in live network, you would never be in such a situation where a network allow such a huge resource allocation for any single UE and Radio Signal Quality also would not be good enough to achieve those throughput TCP Throughput Links. Cell Configuration and Channel Configuration during Call Processing. It is because the radio channel condition and the network components (or performance of the components) will be different and another big impact is that in live network usually I start seeing UEs supporting higher category and carrier aggregation and seeing troubleshoot case mainly for achieving maximum throughput. LTE - Readings/Test Result . g, a PDCCH for the same UE) allocated in each subframe changes subframe by subframe. You may know that MCS (Modulation Coding Scheme) is related to Modulation Order (Modulation Depth, e. RSRP(Reference Signal Recieved Power) RSRP is the linear average of reference singal power (in Watts) accorss the specified bandwidth (in number of REs). 1-1 and Table 5. The data rate at this step is determined only by number of REs allocated for the data and the modulation method (QPSK, QAM, 16 QAM etc). Even in terms of 3GPP, the details of VoNR procedure is described in 23. Generally we do this kind of test in two different level, one at L1/PHY layer and one at IP layer. In this section, I would show you some examples showing the increased communication reliability with a couple of different Transmission Mode. As you naturally guess, the throughput you would achieve in Live Network would be different in large degree from the one you get with test equipment. 508 works fine for most of the case including max throughput case in Cat 3 device. UMTS Throughput Release 99 HSPA CQI vs Throughput UE Categories. 3 TDD HARQ-ACK feedback procedures (I revised the statement a little bit to make it simple and hopefully clearer) Category M(LTE-M) Recently (as of Sep 2015) you might have seen two obvious directions of LTE evolution. TCP Performance Degradation of In-Sequence Delivery in LTE Link Layer ()Hyun-Seo Park, Jae-Yong Lee and Byung-Chul Kim This site is for everything on 4G/LTE. 213 10. For your reference, I created a table showing you a maximum (near maximum) throughput for most commonly used HSDPA categories. I found a couple of examples of the max throughput calculator as listed below. Whenever you are doing the throughput test for your initial device, I always recommend you to check first if these assumptions are met before you are expecting any good throughput. For this mechanism to work properly, there should be a certain level of agreement between UE and the network about "which CQI value means which transport block size". This logic applies at least to 4G and 5G. PDSCH (Physical Downlink Shared Channel). SIB(System Information Block) As the functionalities of LTE evolves and start interplay with other radio technologies (e. g, plain option 3 or 3a or 3x). WiFi. Why CoMP ? As you may learned from the evolution path of any wireless communication, the strongest motivation for new technology and new feature is to increase the throughput and/or to increase the reliability of the communication. TCP Throughput . Basic. AI/ML/LLM This site is for everything on 4G/LTE. Live Air Throughput General Test in Real Life Drive Test This throughput often get configured with the throughput calculated at the last step of this process. Performance like throughput, latency is superior in N1 mode compared to when anchored via 4G core in S1 mode. g, in real demand on high throughput or when the primary cell is overloaded). Amarisoft TechAcademy Throughput TechSlide Flashcard . RACH stands for Random Access Channel. However, getting deeper into the details. In other words, it means "The code rate is defined as the ratio between the transport block size and the total number of physical layer bits per subframe tha MAX Throughput . LTE Throughput General Overall Factors PHY Performance RLC Factors Low Tput App Ideal Throughput Readings/TestResult. The throughput for a device working in a live net So, you would want to know the correlation between data throughput and the signal quality. You see there is pretty much gap between the two plots. For split and LWA bearers, routing and reordering. . At least, you have to check the first three item (PHY/MAC condition) for sure. g, Cat 6 or Cat 9 as of 2015 Jan timeframe) or very low throughput based on very small packet size. Throughput Calculation Example - FDD. Data Throughput Links . Data Throughput UMTS - UE Catetories MAX Throughput . 1 Logical channel configurations. I used Code Rate (R) value from 38. Opinion 1 : I know the ideal max throughput is 100 Mbps, but I think it doesn't make much sense at least for a mobile device because in live network, you would never be in such a situation where a network allow such a huge resource allocation for any single UE and Radio Signal Quality also would not be good enough to achieve those throughput 4G/LTE - Basic Call Processing Typical Packet Call. Even though they use a little bit different name, in all cellular technology (CDMA, GSM, WCDMA, LTE) there is a specific signal that perform the same function. For now, I am illustrating only one specific cases but you can draw varying illustrations depending on situation. These are what I found in internet. It is based on general concept of Option 3, but not showing any specific variation of the option (e. It is because the radio channel condition and the network components (or performance of the components) will be different and another big impact is that in live network usually According to my experience, it would be relatively easy to achieve the optimum throughput for medium range of throughput (e. But the issue is not with the low throughput, but with some other constraints. (The reason is same as above) iii) With low CQI, it is for sure that you cannot achieve the maximum throughput. So achieving a max throughput can be a very good criteria of the whole device functioning under a very stressful (fully loaded) condition and also be a good validation criteria for chipset's encoding/decoding process, L2, L3 and various device drivers. The practical throughput may vary widely depending on DL / UL 5G RACH in Details. PDSCH is a physical channel that carries user data. There are several different approaches for throughput testing and followings are a couple of possible sectors (or profiles) I can think of for throughput testing. < 2014 ~ > I think most of the basic functionality (Single Cell, Throughput focused) for LTE UE became mature at least for a leading chipset manufacturer. 331 - 9. S1 mode allows introducing 5G NR with existing 4G core. Links on Throughput Test in the field. AI/ML/LLM Aug 27, 2022 · The main difference is that the IMS is established by and go through 5G Core network in VoNR whereas it is established by and go through 4G core network. It is to transmit the multiple data stream in parallel (i. CCE Index is the CCE number at which the control channel data (PDCCH) is allocated. In normal DL or UL subframe, TBS/subframe can be calculated in the same way as in FDD. Followings are some of the items that is worth noticing from 3GPP 36. < Increasing Modulation Depth > According to my experience, it would be relatively easy to achieve the optimum throughput for medium range of throughput (e. UE Category for PHY layer throughput . 1-2 , but real code rate can vary a little bit from the value in the table but you can use the table value as a rough estimator. g, you can monitor the CPU utilization using Windows Task Manager) This site is for everything on 4G/LTE. Actually there is another way of simultaneous throughput of multiple data stream, called CoMP (Coordinated multi-point operation). g, Cat 3 or Cat 4 max throughput), but it is not easy to achieve the extremley high throughput (e. So I want to talk about general technique for increasing the data rate. One direction is 'higher and higher throughput' based on Carrier Aggregation (2 CC, 3CC and even 4CC) and the other direction is 'lower and lower throughput' with 'Low Cost' and 'Lower Energy Consumption'. One is what we usually call (sub 6 Ghz) and the other is what we usually call millimeter wave. Simply put, it is a technique to increase the data throughput by using multiple transmitter antenna and multiple reciever antenna. Throughput Calculation - From UE Cateogory . 12-1: OFDM parameters and CPRI Specification 6. N1 mode requires deploying the new 5G core first. Some TM is designed mainly to increase throughput, some are to increase communication reliability and some are to handle multiple users simultaneously etc. 5G NR Throughput Calculator | 5G NR Throughput Formula ; 5G NR Throughput calculator; Reference. In live network for HSDPA, Network sends data with different transport block size depending on CQI value reported by UE. Finding the Root Cause of the low throughput . 214 - Table 5. If you look into the downlink signal, you would notice that it is made up of many different components. This modulation order is defined as a Parameter called Qm in 3GPP and the relationship between MCS value and Qm is defined in a little bit differently for PDSCH and PUSCH in the three tables Max Throughput Calculators. The practical throughput may vary widely depending on DL / UL This site is for everything on 4G/LTE. nyiogm mkwb nimvrf hxe wqll cbmin mivn rlmegu ydulsw eavlf