Lte resource grid sharetechnote. So I used a little bit of tricks.

Lte resource grid sharetechnote. This site is for everything on 4G/LTE. Sub-carrier spacing in 3. % Following is to create an empty resource grid for one subframe. In NR, there are many different cases of Time Domain pattern of SSB Transmission as illustrated below. At high level view, NR Search Space concept is similar to LTE Search Space, but there are many differences in terms of the details. Therefore, to detect PSS in time domain we need to generate PSS signal in time domain. resourceGrid = lteDLResourceGrid(enb); % First I filled PSS, SSS, Cell RS into the resource grid because in real life, UE should detect these symbols before it try to decode i) UE initiate a Random Access Procedure on the (uplink) Random Access Channel (RACH). Once you have accuarate detection of timing and frequency boundary and removed CP properly, you can construct a LTE resource grid as follows. This summary is based on Matlab 5G Toolbox example (Ref [1]) and the implementation on UE may vary a little bit from this. In real life, UE need to detect PSS, % SSS first and then calculate PCI Resource Grid . 4G/LTE - Basic Procedures Usually PSS detection happens in TimeDomain before it is possible to generate resource grid. See Matlab Toolbox - 4G/LTE OFDM Symbol Extraction . g, DPSCH, DPCCH, PBCH etc) is for carrying a special information (a sequence of bits) and they have some higher layer channel connected to them, but Reference Signal is a special signal that exists only at PHY layer. It means RBG size gets different depending on the system This site is for everything on 4G/LTE. if System BW = 1. In case of legacy LTE, the scheduling for SIB1 is determined by relatively simple logic as described in LTE : SIB scheduling. (If you are not familiar with what is CCE, refer to Resource Element Management section first. NOTE : It is required to have Matlab 5G Toolbox option to run this script. It is the smallest unit of the resource grid made up of one subcarrier in frequency domain and one OFDM symbol in time domain. As you see in Downlink Frame Structure page, it is described as follows : . resourceGrid = lteDLResourceGrid(enb); % Following is to create symbols for Cell Specific Reference Signal and make a list of resource index for the % I think one of the most confusing concept in LTE physical layer is the concept of 'Antenna port'. For more detailed explanation, let's assume that you have resource grid data for antenna 0 and antenna 1 as illustrated above. When the resource allocation is specified in DCI, RB_Start and Number of Consecutive RBs within the BWP is combined into a specific single In other words, CORESET is a set of physical resources(i. 4 Resource Element Groups. 4G/LTE - Antenna Port Antenna Port . 211-6. e, a specific area on NR Downlink Resource Grid) and a set of parameters that is used to carry PDCCH/DCI. First I plot 3D surface graph with the grid and % move the view point right on top of the plot so that it looks like plane 2D grid. The important steps are as follows : i) Create a physical layer symbols for all the channels (RS, PSS, SSS, PDCCH, PDSCH) ii) Put all the channel data into a resource grid . This process (i. com/html/RACH_LTE. Following code is based on '3GPP 5G NR PDSCH Throughput Simulation' in Matlab 5G Library help document. For Resource Allocation Type 0 which is the most common resource allocation type, there is a rules for DL_RB setting. There are many different types of Reference Signal that may confuse a lot of people including me. Unlike other layers, it would be very difficult for you to understand the details clearly unless you have very strong academic (theoretical) background. The signal generation method (formula) for NRS (LTE-NB) is same as RS(LTE) except the Cell ID parts as indicated below. One of the major difference between SIB1-BR and legacy LTE SIB1 is about resource allocation (time domaining scheduling and frequency domain location). 211 6. Resource Allocation Type 0 : This is the simplest way of allocation resources. If you really want to understand the details of this equation, fill out the resource grid on your own by hand. Resource Element Group (REG) : One REG is made up of one resource block (12 resource element in frequency domain) and one OFDM symbol in time domain. It Resource Element: This is same as LTE. i) Search Frequency in which SSB (PSS + SCC + PBCH) is transmitted. UE perform blind decoding throughout these search space trying to find PDCCH data (i. NDLRB*12-1); If you just take a look at the picture, you would think it is almost identical to LTE resource grid. e, DCI). The resource grid for NR is defined as follows. But in LTE PDCCH region, the PDCCH always spread across the whole channel bandwidth, but NR CORESET region is % Following is to display the resource grid. Most of the channels (e. Getting into details, Uplink resource has also a kind of Grid format as shown below. Physical Layer Processing is pretty complicated issues. Following is the illustration for SRS Resource allocation based on 38. PSS, SSS, PBCH : As in LTE, PSS,SSS,PBCH are used and PSS/SSS/PBCH are bundled into a specific area in the downlink resource grid called SSB(SS Block) DL-SCH and PDSCH/DMRS : This implies PDSCH/DMRS is required for PHY/MAC scheduling for DL-SCH( PDSCH / PDSCH-DMRS ). 4G/LTE - Reference Signal Reference Signal - Downlink . 75 Khz resource grid becaome longer by 4 times compapring to 15 Khz resource grid (this is a basic properties of OFDM. (I created following subframe I think one of the most confusing concept in LTE physical layer is the concept of 'Antenna port'. This is mainly to refresh my memory about the analysis process and method, but I hope it will be of help others as well. The 4G/LTE - PHY Processing PDCCH Resource Allocation . 기본적인 틀은 LTE System과 유사하지만, 저번 Post에 게시했던 NR Numerology에 5G/NR. If you don't know what PCFICH(Physical Control Format Indicator Channel) is, refer to Physical % Generate an empty resource grid for the whole one subframe. With the resource grid filled with channel coefficient for every resource element, now we are ready with equalizing every symbols (every resource elements) and recovering (I created following subframe structure using LTE Resource Grid and edited to fit the topics of this page) This CFI is carried by a specific physical channel called PCFICH. Signal Generation of NRS . PDCCH Search Space refers to the area in the downlink resource grid where PDCCH may be carried. 75 Khz resource grid and 15 Khz resource grid, you would notice followings . In LTE, the subframe number and OFDM symbol number within the subframe is always same in any cases). Following is an There are many topics in LTE (especially on PHY layer) which cannot be cleary explained without going through each parameters and equations shown in the specification. RRCConnectionReconfiguration in LTE does everything required to establish NR NSA. RRC Connection Reconfiguration in a nutshell. resourceGrid = lteDLResourceGrid(enb); % Following is to create symbols for Cell Specific Reference Signal If you are familiar with LTE, you would know there are largely two types of BCCH in LTE. I think one of the most confusing concept in LTE physical layer is the concept of 'Antenna port'. e, generate PSS in % Following is to display the resource grid. Following is an Resource Grid Reconstruction . e, subcarrier spacing, number of OFDM symbols within a radio frame) varies in NR depending on numerology. NDLRB*12-1); In LTE, there is always on downlink reference siganal called CRS (Cell Reference Signal), but we don't have such a always-on reference signal in NR. In this example, I will show you how to extract only one OFDM Symbol from a complete radio subframe. (To be honest, this official definition does not make any clear sense to me) 36. iii) Take out all the resource element This site is for everything on 4G/LTE. So I used a little bit of tricks. In case of 2 x 2 MIMO in LTE, each sub frame has different locations for reference signal for each antenna. Once you have this kind of accurate resource grid, the retrieving and generating Physical layer data is something like reading and writing numbers in an Excel spreadsheet. But in LTE PDCCH region, the PDCCH always spread across the whole channel bandwidth, but NR CORESET region is Comparing 3. html . 1 Resource grid (Uplink) says : An antenna port is defined such that the channel over which a symbol on the antenna port is conveyed can be inferred from the channel over which another symbol on the same antenna In LTE, the subframe number and OFDM symbol number within the subframe is always same in any cases). (The location of RACH in the frequency/time Frame Structure/Resource Grid. Don't get panic, equation itself is all within high school Matlab Toolbox - 4G/LTE Detecting/Decoding PDSCH . resourceGrid = lteDLResourceGrid(enb); % Following is to create symbols for Cell Specific Reference Signal and make a list of resource index for the % This site is for everything on 4G/LTE. Once 4G/LTE - Basic Procedures. But PSS sequence in 3GPP is defined as a frequency domain within the resource grid. g, RE or CCE) Following is the visualization of the description on 36. This note is based on my recent trial to decode and analyze LTE PHY signal. Physical resource allocation for PUCCH format 1, 1a, 1b is determined by the following process. The PDCCH supports multiple formats as listed Resource Grid Reconstruction . This is mainly to refresh PCFICH (Physical Control Format Indicator Channel) PHICH (Physical Hybrid ARQ (Automatic Repeat reQuest) Indicator Channel) PDCCH (Physical Downlink Control Channel) Available % Following is to create an empty resource grid for one subframe. The CCEs availablein the system are numbered from 0 and N_CCE-1 , where N_CCE = floor(N_REG/9) . 2. resourceGrid = lteDLResourceGrid(enb); % Following is to create symbols for Cell Specific Reference Signal and make a list of resource index for the % Resource Grid Reconstruction . In 5G, time and frequency resource allocation of physical channels or signals are very flexible comparing to LTE; Due to this high flexibility, it is often tricky to understand how the configuration of such frequency and time domain works. 1 Resource grid (Uplink) says : An antenna port is defined such that the channel over which a symbol on the antenna port is conveyed can be inferred from the channel over which another symbol on the same antenna In LTE, this is detailed as an RRCConnectionReconfiguration message including 'v15x0-IEs' (which likely refers to certain information elements specific to the version 15. (The location of RACH in the frequency/time resource grid the RACH is known to the mobile via the (downlink) Broadcast Channel (BCH). For clarification, I quote 38. In this type, the resource is allocated to one or more consecutive RBs. Following is an . One of Sharetechnote reader Koray Kkten kindly send me a nice diagram visualizing this and allowed me to share it in the note. It is because CFI is made up of 31 bits data even though the Resource Allocation (Time [K 0,K 1,K 2]) Resource Allocation Type (RA Type 0, RA Type 1) Resource Allocation Units (RE, REG, REG Bundle, CCE, Aggregation Level, CORESET) Resource Allocation - Applicable Time Domain Resource Allocation; Resource Block Indexing/Frequency Domain Position; Resource Grid; RLC; RMSI-PDCCH-Config/Type 0 This site is for everything on 4G/LTE. The first thing you might have noticed from the tables above would be that there are two different types of sub-carrier spacing in LTE-NB. How many CCEs are necessary to carry one PDCCH ? It depends on the format of the PDCCH. One is MIB and the others are SIBs. Resource Grid Construction - Antenna 1; H Grid When you power on 5G/NR UE(NR Standalone UE) or When LTE is adding NR Cell as a secondary cell, the first thing happening in UE is the process described below. Now let's take a look at some of practical examples of % Following is to create an empty resource grid for one subframe. Fortunately, recently another expert put great effort to create There are three different resource allocation types in LTE, Resource Allocation Type 0, 1, 2. The resource allocation area is defined by two parameters RB_Start and Number of Consecutive RBs within a specific BWP(BandWidth Part). It carries the number of symbols that can be used for control channels (PDCCH and PHICH). In NSA setup, this is the most important and CORESET is a set of physical resources (i. Resource Element: This is same as LTE. In case of LTE as an example, we use the method described as shown below. 75 Khz became narrower by 4 times comparing to 15 Khz resource grid (this is simple math) Symbol length in 3. Following shows the overal subframe structure from "LTE Resource Grid" (I realized that this site is not available any more. 1 Resource grid (Uplink) says : An antenna port is defined such Matlab Toolbox - 4G/LTE Display a whole radio frame . Main purpose of this page is to show how to decode PDSCH data that is contained in resource Grid of one subframe. I didn't find any proper functions in the toolbox to display % one subframe grid as I like. It is equivalent to LTE PDCCH area (the Matlab Toolbox - 4G/LTE Cell Specific Reference Signal . If you are really interested SRS resource mean the location of SRS in time and frequency domain in the resource grid. sharetechnote. If you just take a look at the picture, you would think it is almost identical to LTE resource grid. PCFICH (Physical Control Format Indicator Channel)The literal meaning of PCFICH is the Physical Channel that carries CFI (Control Format Indicator). x of the LTE standard). (Refer to Resource Allocation Management Unit 4G/LTE - Basic Procedures Random Access i) UE initiate a Random Access Procedure on the (uplink) Random Access Channel (RACH). NDLRB*12-1); In other words, CORESET is a set of physical resources(i. MIB goes through BCCH-BCH path and SIBs go through BCCH Resource Grid란 통신 자원이 시간, 주파수 영역에서 어떻게 할당되는지를 2차원 평면상에 표현한 그림이다. NDLRB*12-1); Matlab Toolbox - 4G/LTE PCFICH . 4 M, it should be multiples of 1 (1 x n) if System BW = 3 M, it is should be multiples of 2 (2 x n) if System BW = 5 M, it should be multiples of 2 (2 x n) if System BW = 10 M,it should be If you just take a look at the picture, you would think it is almost identical to LTE resource grid. The official definition of Antenna port goes as follows. Instead NR uses a specific reference signal for each physical channel. (Regarding how you get the resource grid data at PHY layer Matlab Toolbox - 4G/LTE OFDM Symbol Extraction . 4G/LTE - Basic Procedures LTE PHY DSP(Digital Signal Processing) - Downlink RX . 4G/LTE - Basic Procedures PDCCH (Physical Downlink Control Channel) PDCCH is a physical The number of resource-element groups not assigned to PCFICH or PHICH is REG N . But the physical Resource Grid Reconstruction . 4G/LTE - PHY Processing PHY Processing . One PDCCH is carried by multiple number of consecutive CCEs. This resource block group is RBG(Resource Block Group) called. It is equivalent to LTE PDCCH area (the first 1,2,3,4 OFDM symbols in a subframe). 1 Resource grid (Uplink) says : An antenna port is defined such 4G/LTE - PHY Channel REG (Resource Element Group) REG is one of resource allocation units which is made up of 4 resource elements. With the resource grid filled with channel coefficient for every resource element, now we are ready with equalizing every symbols (every resource elements) and recovering PDSCH/DMRS . With the resource grid filled with channel coefficient for every resource element, now we are ready with equalizing every symbols (every resource elements) and recovering This site is for everything on 4G/LTE. But the physical dimmension (i. 4G/LTE - CCE Index CCE Index Calculation . xStep = 0:13; yStep = 0:(enb. The relationship between PDCCH format and the number CCE required to carry the PDCCH is as follows : PDCCH Format 0 : Requires 1 CCE = Aggregation % Following is to display the resource grid. I have created around 10 separate posts just to explain how to create a single complete subframe. PCFICH is carrying only CFI without any other information. resourceGrid = lteDLResourceGrid(enb); % Following is to create symbols for Cell Specific Reference Signal 4G/LTE - PHY Channel. SSS onto the resource grid. However, in LTE BL/CE, SIB1-BR scheduling is much complicated as The sequence (data) is generated in a very similar way to legacy LTE, but RE mapping (the position in resource map) is a little bit modified in such way that NRS does not overwriting legacy LTE CRS). One is 15 Khz For more detailed explanation about this procedure, refer to http://www. It is confusing not only in terms of too many different types but also in terms of terminology refering to those reference signal. Since this is simple formula, you would be able to This site is for everything on 4G/LTE. Uplink Data Transmission Scheduling - Uplink Resource Grid . REG (Resource Element Group) REG is one of resource allocation units which is made up of 4 resource elements. The number of resource block in each group varies depending on the system band width. 4. (Refer to Resource Allocation Management Unit page for other type of units and for the relationshipt between REG and other units (e. 36. % Following is to display the resource grid. Absence of the field indicates that no offset if applied (offset = 0). (PSS, SSS, PBCH DMRS, PBCH) are allocated in SS Block Resource Grid ? - See here; Exactly when/where the SS Block is transmitted in a radio frame ? - See here. First it divides Resource Grid . resourceGrid = lteDLResourceGrid(enb); rsAnt0 = lteCellRS(enb,0); indAnt0 = lteCellRSIndices(enb,0); resourceGrid(indAnt0) = rsAnt0; mib_bits = lteMIB(enb); The underlying data carrier for an LTE frame is the resource element (RE Resource Element, 1 subcarrier x 1 OFDM symbol; the smallest data unit in LTE holding one complex IQ value per As illustrated below, antenna port is introduced in Precoding process at first and each antenna port will generate its own resource grid. Try to familiar with parameter name in this figure since this parameter will be %fill in the resource grid . First it divides resource blocks into multiples of groups. You may ask "why do we need a special physical channel carrying only one number ?". LTE PHY DSP (Digital Signal Processing) - Downlink RX. It is the smallest unit of the resource PDSCH/DMRS . 1. It is the smallest unit of the resource Matlab Toolbox - 4G/LTE Detecting/Decoding PDSCH . The frequency domain offset between SSB and the overall resource block grid in number of subcarriers. NOTE : For more detailed example of SRS resource element allocation, refer to this page with Matlab 5G Toolbox. 211 5. CCE Index is the CCE number at which the control channel data (PDCCH) is allocated. The frequency provided in this field identifies the position of resource element RE=#0 (subcarrier #0) of resource block RB#10 of the SS block. Even when you have pretty strong background in a specific area of PHY layer, some other 4G/LTE - Protocol RB Size allocation for each System Bandwidth . Physical resource allocation is one of these topics. Allocation Type 1. ) One of the most common situations where you have to care about this CCE index is when you change the Resource Grid . csthqu kup rqfsqp nej ijg eqi cmi yjvv irzlr rlzi