Nr Pucch Sharetechnote, In In PUCCH formats 0, 1, 3, and 4, the
- Nr Pucch Sharetechnote, In In PUCCH formats 0, 1, 3, and 4, the waveform is built around a Zadoff–Chu-like complex sequence ru,v(α,δ) (n). Any specific 3GPP statement (like the statement you made before) ? 5G/NR - MAC CE Timing Advance The concept and functionality of NR Timing Advance is same as the LTE Timing Advance. If you have a good understandings on power control concept and mechnisnm of 3G or 4G, you will not have much difficulties in understanding 5G power control. I will not talk much of those common featuers and concept. 5G/NR - SR SR (Scheduling Request) Basic funcationality and mechanism for NR SR is almost same as LTE SR. So I would not explain much of the basic concept on carrier aggregation in this note, please refer to LTE carrier aggregation page for the concept and process of establishing CA (carrier aggregation). Those multiple PDSCH and PUSCH in this mechanism carries the same user data but with different redundancy version. What is SR ? When is SR triggered / transmitted ? Physical Channel to Carry SR Who is controlling the SR process ? When SR is not triggered/pre The nr-SecondaryCellGroupConfig Information Element (IE) is critical for configuring Secondary Cell Groups (SCG) in NR systems that utilize Dual Connectivity (DC). Here: u (group index) may change per slot according to group hopping. In NR, RRC message defined a table listing multiple possible timing between data and HARQ and DCI specifies a specific elements of the table defined in the RRC message. If you are intrested in those long discussions and histories about show these specification tpc-PUCCH SetupRelease { PUCCH-TPC-CommandConfig } OPTIONAL, } Reference [1] Understanding the Heart of the 5G Air Interface: An Overview of Physical Downlink Control Channel for 5G New Radio (NR) - by Kazuki Takeda, Huilin Xu, Taehyoung Kim, Karol Schober∧, and Xingqin Lin# Qualcomm Inc. PUCCH Format 1,1a,1b Location How are the location of multiple PUCCHs from Multiple UE ? Effects of Parameters on PUCCH Format 1 location Signal Generation of PUCCH 5G/NR - Resource Allocation Resource Allocation in Time Domain and Ack/Nack Response Timing in a Nutshell 5G/NR - Release 17 NR Release 17 Highlights Roughly speaking, Release 17 is mostly for further enhancing the features introduced in Release 16. It is too big topics to be described in single page. 213) and what is described here would remain messy without clear big picture for a while until I myself get clear understanding on this process. 5G DCI in Detail DCI stands for Downlink Control Information. Most of the fundamental paramters of PUSCH DMRS are same as in PDSCH DMRS. Overall Procedure Why 2 step RACH ? Overview on Configuration RRC Parameters for 5G CSI Report in Detail At high level, the concept of CSI Report (Channel State Information) in NR is similar to CSI Report in LTE, but the details especially on the resource application of various reference signal and scheduing of the report is extremely complex than LTE. To be honest, the number of steps would look differently depending on how to split the whole procedure into smaller steps. So I will talk more on why we need freuqency and what kind of hopping pattern it use. BWP is a part of the total channel bandwidth configured for a cell that is used for a UE at a specific moment of operation. As DCI (Downlink Control Information) is carried by PDCCH, UCI is carried by PUCCH. How gNB can schedule those physical channels without using DCI ? 5G/NR NR Release 16 Highlights As you may have noticed from evolution path of previous technologies (2G, 3G, 4G), most of the evolution proceeds in two major way as below. Enhance the existing features Bring in new features Release 16 is the evolution of Release 15. PUCCH PUSCH AggregationFactor PUSCH Channel Coding and Transmssion Process PUSCH DMRS PUSCH Precoding / Transmission Mode (Codebook vs Non-Codebook based)/UL Transmission Scheme QCL (Quasi Co Location)/TCI QoS / QFI / QRI RACH RACH-2 Step Radio Finger Printing Radio Protocol Architecture RAN Architecture RateMatchPattern Reference Signal RedCap 5G/NR Quick Reference System Architecture Flow across System PHY and Protocol Frame Structure Numerology Waveform Frequency Band BWP Synchronization Beam Management CSI Framework Channel Mapping CORESET DCI SLIV UCI/PUCCH Reference Signal MAC RLC PDCP SS Block Scheduling MIB / SIB RACH RRC Overview RrcReconfiguration NSA/ENDC SA/Initial Attach 5G/NR - Power Control Power Control In a big picture, the power control of 3G (WCDMA/HSPA) , 4G (LTE) and 5G (NR) are almost same. I would write 5G/NR - SR SR (Scheduling Request) Basic funcationality and mechanism for NR SR is almost same as LTE SR. 211. α (cyclic shift) can be updated on a symbol-by-symbol basis to introduce cyclic shift hopping. Jul 26, 2025 ยท The allocation of PUCCH (Physical Uplink Control Channel) resource elements in 5G NR is defined in both the frequency and time domains and is adaptive to the numerology (subcarrier spacing, slot duration) used for the carrier, as well as the specific requirements of the PUCCH payload (control information size, latency). v (sequence index) can also be varied if sequence hopping is enabled. Same definition applies to LTE frequency hopping as well. Spectrum Expansion and Coverage Enhancement can be considered as a new 5G/NR - Channel Mapping Channel Mapping Following illustration is the 5G/NR channel mapping from MAC layer through PHY layer based on 38. 5G/NR - PUCCH PUCCH / UCI in a Nutshell PUCCH / UCI in Detail PUCCH is an uplink physical channel that carries UCI (Uplink Control Information). In this page, I will describe on NR Frame Structure that is specified in 3GPP specification (38. e, Release 15) ? I think in practical sense Release 15 is focused on only one feature 5G/NR - SLIV SLIV (Start and Length Indicator Value) SLIV is the Start and Length Indicator for the time domain allocation for PDSCH. both gNB Rx to Tx switch and UE Tx to Rx switch are adjusted in UL advance only. The CRC is a fixed-size checksum generated by appl 5G/NR - UCI UCI PUCCH is an uplink physical channel that carries UCI (Uplink Control Information). e, DCI). However, in practice 'wide flexibility' often mean 'too high degree of complexity', 'difficulties of understanding the details' and 'confusion'. It is to deliver 5G/NR service via space (satellite) or air (airborne platform) as illlustrated below. Highlevel view of the 2step RACH can be illustrated as 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. In this page, I would try to give you only the big picture of the whole channel structure in NR, I would not get into the details of each type of channel processing separately. 4G/LTE - Basic Procedures PUSCH Frequency Hopping Everybody would know what the frequency hopping is ? It is a special transmission technique sending data with changing crarrier frequency in a certain pattern. I think this is equivalent to SPS in LTE. But there are pretty complicated process and factors as described below. Why NTN ? Challenges Delay Requirements Performance Requirements How 3GPP is updated to get around the problems and meet the requirements listed above ? Examples 5G/NR - Dynamic Scheduling Dynamic Scheduling NR scheduling offers super wide flexibility that get so many factors involved. But this reference (5G NR Physical Layer | Chapter 12| Uplink Transmission Schemes | Codebook & Non-Codebook Based) says 'Even in non-codebook based transmission, precoding DO happens, but the precoding matrix is created by UE algorithm based on CSI-RS based channel estimation, not picking up a matrix from a predefined list of codebook'. , Samsung Electronics,∧Nokia, #Ericsson Inc. . What is SR ? When is SR triggered / transmitted ? Physical Channel to Carry SR Who is controlling the SR process ? When SR is not triggered/pre 5G/NR - NTN NTN (Non Terestrial Network) The basic idea of NTN is obvious. Explore the 5G NR PUCCH, covering its function, contents, physical layer processing, and mapping within the 5G NR wireless system. I would write 5G/NR - Carrier Aggregation Carrier Aggregation The basic concept of carrier aggregation and the process of establishing carrier aggregaion in NR is almost same as LTE carrier aggregation. [Sharetechnote] Thank you. LTE SS Block vs NR SS Block Following illustrations shows some high level differences between LTE SS Block and NR SS Block (In LTE, we didn't use the term 'SS Block', but LTE also use PSS/SSS and PBCH which can be called as SS Block). Major difference between LTE SS/PBCH and NR SSH lies in the periodicity of each channel. 5G/NR - Configured Scheduling Configured Scheduling Configured Scheduling is a mechanism in which gNB can schedule PDSCH/PUSCH without using DCI for every transmission. It is an 5G | ShareTechnote High level concept of NR SRS is same as in LTE SRS and some of lower level parameter are very similar to LTE SRS lower layer parameter. Some of the major topics in release 17 can be summarized as follows. Mainly due to this complexity, I have written several individual notes that are directly or indirectly related to NR [Sharetechnote] does it mean that UE should start transmitting PUCCH at (the start symbol time of PUCCH - switching time) as well ? [Sakshama] yes true. As you may notice, Massive MIMO, IAB, URLLC,Power Saving can be considered as the enhancement for release 16. If you are not familiar with the power control concept and mechanism, I would suggest you to read LTE Power 5G Frame Structure in Detail There has been long long discussions on frame structure both in academia and in 3GPP and now we have pretty clear agreements on what a NR (5G) radio frame would look like. This page is about another new concept in NR called BWP (BandWidth Part). 321 and 38. The sequence ru,v(α,δ) (n) can be 5G/NR - PDSCH/PUSCH PDSCH/PUSCH Aggregation Factor / Repetition The term Aggregation Factor in this context refers to the aggregation in time domain, more specifically the PDSCH and PUSCH over multiple consecutive slots. So for those common feature/concept, refer to the note on LTE RACH even though you are intersted only in NR RACH. a CRC is calculated for the transport block to enable error detection at the receiver (UE). 5G/NR - Search Space Search Space PDCCH Search Space refers to the area in the downlink resource grid where PDCCH may be carried. Simply put, Timing Advance is a special command (notification) from eNB to UE that enable UE to adjust its uplink transmission as shown 5G/NR - 2Step RACH 2 Step RACH As the term implies 2 Step RACH indicates a type of RACH procedure that are complete in 2 steps. UE perform blind decoding throughout these search space trying to find PDCCH data (i. In LTE, SS (PSS,SSS) are transmitted in every 5ms and PBCH is tranmitted NOTE : In this note, I will focus mostly on NR specific RACH features, but there are many features and concept which is common for both LTE and NR. So I suggest you to read LTE Timing Advance as well if you are not familiar with the concept. If you are familiar with LTE SR, it would not be difficult to understand SR in NR and easier to understand NR SR by comparision with LTE SR. 5G RACH in Details RACH stands for Random Access Channel. Simply put, it has several major functionalities as follows : Carrying the information to schedule (allocate physical resources) for Downlink Data (PDSCH) Carrying the information to schedule (allocate physical resources) for Uplink Data (PUSCH) Carrying the information to adjust Uplink Power (PUSCH, PUCCH power) for power control 5G/NR - PUSCH DMRS PUSCH DMRS (DeModulation Reference Signal) PUSCH DMRS is a special type of physical layer signal which functions as a reference signal for decoding PUSCH. One think to be noticed is that LTE use 5G/NR - Channel Mapping Channel Mapping Following illustration is the 5G/NR channel mapping from MAC layer through PHY layer based on 38. Codebook-based HARQ and non-codebook-based HARQ differ primarily in the way HARQ-ACK feedback is structured and 4G/LTE - PHY Channel PUCCH Format 1 As you see in PUCCH Format page, the function of PUCCH Format 1,1a,1b is just to deliver 1 or 2 or 4 bits data to eNodeB. Then what is the existing features (i. The transport block CRC attachment in 5G PDSCH channel processing is a step that allows the UE to detect errors in the received transport block, ensuring reliable data transmission over the wireless channel. In order for UE to decode PDCCH (DCI 5G/NR - HARQ ACK Codebook HARQ ACK Codebook This is one of the complicated topics (at least to me) in 5G/NR Physical Layer Process (38. I would suggest you to go through LTE SRS first if you are new to this concept and then read this page since I would not explain on those basic concepts that are explained in LTE SRS. 211). ibhz2, zyc2, 6rjcgp, kfgtj, 5wts, gt1z, tcdreh, 6fbp, zrhr, qgxh,