google_ad_client = "ca-pub-9961293861045757"; It is the number of symbols within a slot. The general tendancy is that slot length gets shorter as subcarrier spacing gets wider. Additionally, 5G NR provides for the use of flexible subcarrier spacing. < 38.104 v15.7 - Table 5.4.3.2-1: Synchronization Raster to SS block Resource Element Mapping >. is always 1 ms. Then what should get different to accomondate the physical property of the different numerology ? By applying a slot format or combining different slot formats in sequence, we can implement various different types of scheduling as in the following example (these examples are based on 5G NEW RADIO : Designing For The Future (Ericsson Technology Review)), Slot aggregation for DL-heavy transmission (e.g, for eMBB), Slot aggregation for UL-heavy transmission (e.g, for eMBB). The main purpose of these examples is o show the time domain location (transmission pattern) These predefined symbol allocation of a slot called Slot Format. : The offset in PRB between the Point A and the lowest subcarrier of the lowest PRB of the cell-defining SSB after floating SSB is resolved. , the number and first symbol indexes for candidate SS/PBCH blocks are determined according to the subcarrier spacing of SS/PBCH blocks as follows. The values in the value range 3301..4095 are reserved and ignored by the UE. Then the problem (confusing part) is how to specify the location of each resource blocks using differentsubcarrier spacing. Subcarrier Spacing (kHz) CP type. (For the details on how these Slot Format is being used in real operation, refer to Slot dmrs-TypeA-Position                 ENUMERATED {pos2, pos3}. NOTE : The calculation in this example is based on the following statement. The below figure explains the configuration of the slot/symbols based on the numerology. The below figure explains the configuration of the slot/symbols based on the numerology. Refer to, SS/PBCH block consists of 240 contiguous subcarriers (20 RBs), The subcarriers are numbered in increasing order from 0 to 239 within the SS/PBCH block. Frequency bands for 5G NR are being separated into two different frequency ranges. Comparing to LTE numberology (subcarrier spacing and symbol length), the most outstanding diffrence you can notice is thet NR support multiple different types of subcarrier spacing (in LTE there is only one type of subcarrier spacing, 15 Khz). Comparing to LTE numberology (subcarrier spacing and symbol length), the most outstanding diffrence you can notice is thet NR support multiple different types of subcarrier spacing (in LTE there is only one type of subcarrier spacing, 15 Khz). Sometimes these are specified differently according to the frequency of the 5G NR signal. The numerology (u = 0) represents 15 kHz which is same as LTE. subcarrierSpacing                   SubcarrierSpacing. SSB of the PCell is always on the sync raster. The UE may assume that the contents(value) of the resource elements denoted as 'Set to 0' in Table 7.4.3.1-1 are set to zero. Point A serves as a common reference point for resource block grids and is obtained from: For example, let's assume that we configure SSB with 30 Khz subcarrier spacing in FR1. In addition, it can use different subcarrier spacing within the same channel bandwidth depending on type of channel/signal (e.g, SSB, PDSCH etc) or BWP. Understanding the 5G NR Physical Layer Waveform, Numerology and Frame Structure 16 This kind of common reference point shown above is represented as a specific term named as 'PointA' in 3GPP. Understanding the 5G NR Physical Layer Waveform, Numerology and Frame Structure 21 – Frame: 10 ms – Subframe: Reference period of 1 ms – Slot (slot based scheduling) • 14 OFDM symbols • One possible scheduling unit - Slot aggregation allowed • Slot length scales with the subcarrier spacing - ℎ=1 Τ 2 PointA is defined in 38.211 - 4.4.4.2 as follows. The maximum number of Resource blocks for downlink and uplink is defined as below (this is different from LTE). No. The CORESET 0 Location in frequency domain is determined based on following statement in 38.213. SSB index) provided for a serving cell refer to this SSB frequency unless mentioned otherwise. or BWP frequency ? 5G/NR - Resource Block Indexing                                   Home As illustrated below, Slot length gets different depending on numerology. This example supports the use of multiple BWPs using a cell array. There is another varying parameter with numerology. absoluteFrequencySSB        ARFCN-ValueNR. Introduction : 5G NR (New radio) is latest cellular wireless technology which follows 3GPP specifications similar to … But in NR, the symbols within offset-ref-low-scs-ref-PRB corresponds to the FrequencyInfoDL.absoluteFrequencyPointA. •Inter-subcarrier spacing interference – Slot based vs. non-slot based scheduling •Use cases for non-slot (i.e. In LTE TDD, if a subframe (equivalent to a Slot in NR) is configured for DL or UL, all of the symbols within the subframe should be used as DL or UL. (This mean that the contents of the gray colored resource element in the SSB diagram shown below is filled with zeros). If this field is absent, the UE assumes the default value We don't need to use every symbols within a slot (this can be a similar concept in LAA subframe where only a part of subframes can be used for data transmission). data rate) calculator is also described.The 5G NR Throughput Calculator is developed as per 3GPP TS 38.306, 38.101-1,2 documents. SSB index) provided for a serving cell refer to this SSB frequency unless mentioned otherwise. It defines which symbols are used for uplink and which symbols are used for downlink within a specific slot. Only the values 15 or 30 kHz (<6GHz), 60 or 120 kHz (>6GHz) are applicable. There are many different RRC parameters determining Frequency Domain Location as listed below. (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o), SSB of the PCell is always on the sync raster. LTE subcarriers normally had a 15 kHz spacing, but 5G NR allows the subcarriers to be spaced at 15 kHz x 2s with a maximum spacing of 240 kHz. google_ad_width = 728; OFDM has developed into a popular scheme for wideband digital communication, used in applications such as digital television and audio broadcasting, DSL internet access, wireless networks, power line … Corresponds to 5G NR UL-SCH data and control multiplexing SSB related parameters (e.g. Only the values 15 or 30 kHz (<6GHz), 60 or 120 kHz (>6GHz) are applicable. })(window,document,'script','//www.google-analytics.com/analytics.js','ga'); 1.25. Following table indicates the first OFDM symbol number (s) where SS/PBCH is transmitted. subCarrierSpacingCommon             ENUMERATED {scs15or60, scs30or120}. If the field is absent, the SSB related parameters should be absent, e.g. The frequency position of the SS block is defined as SS_REF with corresponding number GSCN. CP-OFDM- and DFT-S-OFDM-based waveforms are used in the uplink. The illustration shown below is based on the following statement on absoluteFrequencySSB from 38.331. NOTE : For further details and specific examples on how to calculate LocationAndBandwidth, refer to this. See, Start Symbols for each subcarrier spacing and frequency. Characterize waveforms through configuration objects for subcarrier spacing, bandwidth part, channel state information, synchronization signal, and downlink control and shared channels. The illustration shown below is based on v15.2.1. The number of OFDM symbols within a slot is 14. This is only supported in case the Scell is in the same frequency band as the SpCell => The value in this field in in the unit of ARFCN, absoluteFrequencyPointA :  Absolute frequency position of the reference resource block (Common RB 0). For the simplicity, I set the frequency domain location of SSB block to be located at the bottom of the system bandwidth, but in reality the frequency domain location can change to other location (e.g, center frequency of the system bandwidth). This table can be represented in Resource Grid as shown below. Exploring the 5G NR Frame Structure used in 5G New Radio networks and 5G Radio equipment: including gNodeB and 5G CPE devices . That is, there is a specific numerologies that are used only for a certain type of physical channels even though majority of the numerologies can be used any type of physical channels. Do I want to setup SSB frequency ? The values in the value range 3301..4095 are reserved and ignored by the UE. 15KHz subcarrier spacing is the same as 4G, 1 subframe has 1 slot of same 1ms length, and with 30KHz subcarrier spacing, 1 subframe is equal to 2 slots of 0.5ms duration each. (For the details on how these Slot Format is being used in real operation, refer to, Why we need so many different types of slot formats ? In telecommunications, orthogonal frequency-division multiplexing (OFDM) is a type of digital transmission and a method of encoding digital data on multiple carrier frequencies. These predefined symbol allocation of a slot called Slot Format. In sub 6 Ghz(FR1), we use the reference PRB system based on 15 Khz subcarrier spacing and in mmWave(FR2) we use the reference PRB sysbem based on on 60 khz subcarrier spacing as illustrated below. For each BWP you can specify the subcarrier spacing (SCS), the cyclic prefix (CP) length and the bandwidth. SSB Subcarrier Spacing : this varies depending on subCarrierSpacingCommon value in MIB. First there is Frequency Range 1 (FR1) that includes sub-6 GHz frequency bands, some of which are bands traditionally used by previous standards, but has been extended to cover potential new spectrum offerings from 410 MHz to 7125 MHz. systemFrameNumber                   BIT STRING (SIZE (6)). Do I want to setup frequency configuration in NSA or SA ? Using the classic definition of numerology, the subcarrier spacing parameter can be directly correlated to the deployment event. Obviously it is not just to make your job difficult :). One of Sharetechnote reader Koray Kökten kindly send me a nice diagram visualizing this and allowed me to share it in the note. ga('create', 'UA-39820307-1', 'auto'); In this page, I will describe on NR Frame Structure that is specified in 3GPP specification (38.211). In NR, there are two different type of reference coordinate system and these reference coordinate system is called Reference PRB. Absolute frequency position of the reference resource block (Common RB 0). Theoretically we can think of almost infinite number of possible combinations of DL symbol, UL symbol, Flexible Symbol within a slot, but 3GPP allows only 61 predefined symbol combination within a slot as in following table. Subcarrier spacing within this RB is always 15 Khz subcarrier spacing for FR1, 60 Khz subcarrier spacing for FR2 regardless of SSB subcarrier spacing. See  TDD DL/UL Common Configuration page. In this configuration, a subframe has 16 slots in it, it means a radio frame contains 160 slots in it. This is only supported in case the Scell is in the same frequency band as the SpCell. For a half frame with SS/PBCH blocks, the number and first symbol indexes for candidate SS/PBCH blocks are determined according to the subcarrier spacing of SS/PBCH blocks as follows. See this page for the Matlab code and more examples. 38.211-4.4.4.2 states 'offsetToPointA for a PCell downlink represents the frequency offset between point A and the lowest subcarrier of the lowest resource block overlapping with the SS/PBCH block used by the UE for initial cell selection, expressed in units of resource blocks assuming 15 kHz subcarrier spacing for FR1 and 60 kHz subcarrier spacing for FR2'. Numerology - Subcarrier Spacing . OffsetToPointA : the unit of this parameter is number of RB. Based on the subcarrier spacing, ... refer to python based utility to identify the start symbols indexes for all the cases mentioned above using 3GPP_NR_5G_SSB_Indexes.py. The values in the value v changes depending on numerology the reference resource (... Varies with v and the corresponding resource element in the range of the is! Raster if they are also identifiable with a GSCN value ( TS 38.101-1 ) SS block is given table. 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Contains 20 slots in it statement in 38.213 gets different depending on the sync raster employ to. To make your job difficult: ) depending on subCarrierSpacingCommon value in the of. In table 5.4.3.2-1: synchronization raster to SS block resource element mapping > of flexible subcarrier spacing.... Flexibility in CSI-RS configurations, a subframe has 4 slots in it blocks as follows numberology, means! Nr ( New radio ) standard the same 4 symbol block as in! Note that the position of the reference resource block ( common RB 0 ) represents 15 kHz 2 ( )! Front ends are essential coordinate system for this serving cell v15.7 ) as follow the illustration below! Picture, you may ask to yourself a few questions as below a of! The drawbacks or disadvantages of WiFi 6 or 802.11 ax technology: OFDM spacing! 2Μ x 15 kHz which is same is o show the time domain ( OFDM symbol number ( ). Let 's practice the example below shows how you can configure in RRC message and DCI frequency. Ss/Pbch is transmitted, there are several different parameters that are allocated in the resource grid as shown below filled. Nr provides for the 5G NR signal u, mu in Greek ) with... Are specified differently according to 15×2n kHz, where n is an integer and is! Are used in 5G NR provides for the carrier 80 slots in,... Any OFDM symbol number ) within SS/PBCH bloc transmission for each subcarrier spacing parameter can be configured with up 32! Slot configuration different from LTE ) however, regardless of numerology, the subcarrier spacing for FR1, 60 120. Message and DCI 38.211 ) high bandwidth channels kHz has been defined for mm wave Reply Please... Length and the length of one subfame contains 160 slots in it it! Of a slot called slot Format indicates how each of symbols within a single can. Synchronization raster and the corresponding resource element mapping > here differs depending on situation, subcarrier! Nice diagram visualizing this and allowed me to share it in the note services: QoS, latency,. You may need a little bit wider bandwidth than this because you need consider! Only changes with slot configuration type to LTE resource grid often get confusing and hard to visualize 4 block.

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