Patent Publication Number: US-2023156715-A1

Title: Switching pucch parameters in response to channel conditions

Description:
TECHNICAL FIELD 
     The present disclosure relates generally to communication systems, and more particularly, to a configuration to update physical uplink control channel (PUCCH) parameters in response to channel conditions. 
     INTRODUCTION 
     Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources. Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems. 
     These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate on a municipal, national, regional, and even global level. An example telecommunication standard is 5G New Radio (NR). 5G NR is part of a continuous mobile broadband evolution promulgated by Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with Internet of Things (IoT)), and other requirements. 5G NR includes services associated with enhanced mobile broadband (eMBB), massive machine type communications (mMTC), and ultra-reliable low latency communications (URLLC). Some aspects of 5G NR may be based on the 4G Long Term Evolution (LTE) standard. There exists a need for further improvements in 5G NR technology. These improvements may also be applicable to other multi-access technologies and the telecommunication standards that employ these technologies. 
     BRIEF SUMMARY 
     The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later. 
     In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a device at a base station. The device may be a processor and/or a modem at a base station or the base station itself. The apparatus transmits, to a user equipment (UE), a configuration to update one or more physical uplink control channel (PUCCH) parameters. The apparatus identifies a change of channel conditions between the UE and the base station. The apparatus transmits, to the UE, an indication to update the one or more PUCCH parameters based at least on the change of the channel conditions. The apparatus communicates, with the UE, based on a PUCCH having the one or more PUCCH parameters updated. 
     In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a device at a UE. The device may be a processor and/or a modem at a UE or the UE itself. The apparatus receives, from a base station, a configuration to update one or more physical uplink control channel (PUCCH) parameters. The apparatus receives, from the base station, an indication to update the one or more PUCCH parameters based at least on a change of channel conditions. The apparatus communicates, with the base station, based on a PUCCH having the one or more PUCCH parameters updated. 
     To the accomplishment of the foregoing and related ends, the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed, and this description is intended to include all such aspects and their equivalents. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a diagram illustrating an example of a wireless communications system and an access network. 
         FIG.  2 A  is a diagram illustrating an example of a first frame, in accordance with various aspects of the present disclosure. 
         FIG.  2 B  is a diagram illustrating an example of DL channels within a subframe, in accordance with various aspects of the present disclosure. 
         FIG.  2 C  is a diagram illustrating an example of a second frame, in accordance with various aspects of the present disclosure. 
         FIG.  2 D  is a diagram illustrating an example of UL channels within a subframe, in accordance with various aspects of the present disclosure. 
         FIG.  3    is a diagram illustrating an example of a base station and user equipment (UE) in an access network. 
         FIG.  4    is a diagram illustrating an example of a PUCCH configuration. 
         FIG.  5    is a diagram illustrating an example of a CQI reporting resource. 
         FIG.  6    is a diagram illustrating an example of a single carrier symbol. 
         FIG.  7    is a diagram illustrating an example of a sampled DFT sequence detector. 
         FIGS.  8 A and  8 B  are diagrams illustrating examples of variations in SINR. 
         FIGS.  9 A and  9 B  are diagrams illustrating examples of interference levels for sampled sequences. 
         FIG.  10    is a diagram illustrating an example of interference across roots of sampled DFT. 
         FIG.  11    is a diagram illustrating an example of flexible modes of information encoding. 
         FIG.  12    is a diagram of a UE initiated parameter change. 
         FIG.  13    is a call flow diagram of signaling between a UE and a base station. 
         FIG.  14    is a flowchart of a method of wireless communication. 
         FIG.  15    is a flowchart of a method of wireless communication. 
         FIG.  16    is a diagram illustrating an example of a hardware implementation for an example apparatus. 
         FIG.  17    is a flowchart of a method of wireless communication. 
         FIG.  18    is a flowchart of a method of wireless communication. 
         FIG.  19    is a diagram illustrating an example of a hardware implementation for an example apparatus. 
     
    
    
     DETAILED DESCRIPTION 
     The detailed description set forth below in connection with the appended drawings is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of various concepts. However, it will be apparent to those skilled in the art that these concepts may be practiced without these specific details. In some instances, well known structures and components are shown in block diagram form in order to avoid obscuring such concepts. 
     Several aspects of telecommunication systems will now be presented with reference to various apparatus and methods. These apparatus and methods will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, components, circuits, processes, algorithms, etc. (collectively referred to as “elements”). These elements may be implemented using electronic hardware, computer software, or any combination thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. 
     By way of example, an element, or any portion of an element, or any combination of elements may be implemented as a “processing system” that includes one or more processors. Examples of processors include microprocessors, microcontrollers, graphics processing units (GPUs), central processing units (CPUs), application processors, digital signal processors (DSPs), reduced instruction set computing (RISC) processors, systems on a chip (SoC), baseband processors, field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure. One or more processors in the processing system may execute software. Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise. 
     Accordingly, in one or more example embodiments, the functions described may be implemented in hardware, software, or any combination thereof. If implemented in software, the functions may be stored on or encoded as one or more instructions or code on a computer-readable medium. Computer-readable media includes computer storage media. Storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise a random-access memory (RAM), a read-only memory (ROM), an electrically erasable programmable ROM (EEPROM), optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of the types of computer-readable media, or any other medium that can be used to store computer executable code in the form of instructions or data structures that can be accessed by a computer. 
     While aspects and implementations are described in this application by illustration to some examples, those skilled in the art will understand that additional implementations and use cases may come about in many different arrangements and scenarios. Innovations described herein may be implemented across many differing platform types, devices, systems, shapes, sizes, and packaging arrangements. For example, implementations and/or uses may come about via integrated chip implementations and other non-module-component based devices (e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail/purchasing devices, medical devices, artificial intelligence (AI)-enabled devices, etc.). While some examples may or may not be specifically directed to use cases or applications, a wide assortment of applicability of described innovations may occur. Implementations may range a spectrum from chip-level or modular components to non-modular, non-chip-level implementations and further to aggregate, distributed, or original equipment manufacturer (OEM) devices or systems incorporating one or more aspects of the described innovations. In some practical settings, devices incorporating described aspects and features may also include additional components and features for implementation and practice of claimed and described aspect. For example, transmission and reception of wireless signals necessarily includes a number of components for analog and digital purposes (e.g., hardware components including antenna, RF-chains, power amplifiers, modulators, buffer, processor(s), interleaver, adders/summers, etc.). It is intended that innovations described herein may be practiced in a wide variety of devices, chip-level components, systems, distributed arrangements, aggregated or disaggregated components, end-user devices, etc. of varying sizes, shapes, and constitution. 
       FIG.  1    is a diagram illustrating an example of a wireless communications system and an access network  100 . The wireless communications system (also referred to as a wireless wide area network (WWAN)) includes base stations  102 , UEs  104 , an Evolved Packet Core (EPC)  160 , and another core network  190  (e.g., a 5G Core (5GC)). The base stations  102  may include macrocells (high power cellular base station) and/or small cells (low power cellular base station). The macrocells include base stations. The small cells include femtocells, picocells, and microcells. 
     The base stations  102  configured for 4G LTE (collectively referred to as Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN)) may interface with the EPC  160  through first backhaul links  132  (e.g., S1 interface). The base stations  102  configured for 5G NR (collectively referred to as Next Generation RAN (NG-RAN)) may interface with core network  190  through second backhaul links  184 . In addition to other functions, the base stations  102  may perform one or more of the following functions: transfer of user data, radio channel ciphering and deciphering, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection setup and release, load balancing, distribution for non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS), subscriber and equipment trace, RAN information management (RIM), paging, positioning, and delivery of warning messages. The base stations  102  may communicate directly or indirectly (e.g., through the EPC  160  or core network  190 ) with each other over third backhaul links  134  (e.g., X2 interface). The first backhaul links  132 , the second backhaul links  184 , and the third backhaul links  134  may be wired or wireless. 
     The base stations  102  may wirelessly communicate with the UEs  104 . Each of the base stations  102  may provide communication coverage for a respective geographic coverage area  110 . There may be overlapping geographic coverage areas  110 . For example, the small cell  102 ′ may have a coverage area  110 ′ that overlaps the coverage area  110  of one or more macro base stations  102 . A network that includes both small cell and macrocells may be known as a heterogeneous network. A heterogeneous network may also include Home Evolved Node Bs (eNBs) (HeNBs), which may provide service to a restricted group known as a closed subscriber group (CSG). The communication links  120  between the base stations  102  and the UEs  104  may include uplink (UL) (also referred to as reverse link) transmissions from a UE  104  to a base station  102  and/or downlink (DL) (also referred to as forward link) transmissions from a base station  102  to a UE  104 . The communication links  120  may use multiple-input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and/or transmit diversity. The communication links may be through one or more carriers. The base stations  102  / UEs  104  may use spectrum up to Y MHz (e.g., 5, 10, 15, 20, 100, 400, etc. MHz) bandwidth per carrier allocated in a carrier aggregation of up to a total of Yx MHz (x component carriers) used for transmission in each direction. The carriers may or may not be adjacent to each other. Allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated for DL than for UL). The component carriers may include a primary component carrier and one or more secondary component carriers. A primary component carrier may be referred to as a primary cell (PCell) and a secondary component carrier may be referred to as a secondary cell (SCell). 
     Certain UEs  104  may communicate with each other using device-to-device (D2D) communication link  158 . The D2D communication link  158  may use the DL/UL WWAN spectrum. The D2D communication link  158  may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH), a physical sidelink discovery channel (PSDCH), a physical sidelink shared channel (PSSCH), and a physical sidelink control channel (PSCCH). D2D communication may be through a variety of wireless D2D communications systems, such as for example, WiMedia, Bluetooth, ZigBee, Wi-Fi based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard, LTE, or NR. 
     The wireless communications system may further include a Wi-Fi access point (AP)  150  in communication with Wi-Fi stations (STAs)  152  via communication links  154 , e.g., in a 5 GHz unlicensed frequency spectrum or the like. When communicating in an unlicensed frequency spectrum, the STAs  152  / AP  150  may perform a clear channel assessment (CCA) prior to communicating in order to determine whether the channel is available. 
     The small cell  102 ′ may operate in a licensed and/or an unlicensed frequency spectrum. When operating in an unlicensed frequency spectrum, the small cell  102 ′  may employ NR and use the same unlicensed frequency spectrum (e.g., 5 GHz, or the like) as used by the Wi-Fi AP  150 . The small cell  102 ′, employing NR in an unlicensed frequency spectrum, may boost coverage to and/or increase capacity of the access network. 
     The electromagnetic spectrum is often subdivided, based on frequency/wavelength, into various classes, bands, channels, etc. In 5G NR, two initial operating bands have been identified as frequency range designations FR1 (410 MHz - 7.125 GHz) and FR2 (24.25 GHz - 52.6 GHz). Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to (interchangeably) as a “sub-6 GHz” band in various documents and articles. A similar nomenclature issue sometimes occurs with regard to FR2, which is often referred to (interchangeably) as a “millimeter wave” band in documents and articles, despite being different from the extremely high frequency (EHF) band (30 GHz - 300 GHz) which is identified by the International Telecommunications Union (ITU) as a “millimeter wave” band. 
     The frequencies between FR1 and FR2 are often referred to as mid-band frequencies. Recent 5G NR studies have identified an operating band for these mid-band frequencies as frequency range designation FR3 (7.125 GHz - 24.25 GHz). Frequency bands falling within FR3 may inherit FR1 characteristics and/or FR2 characteristics, and thus may effectively extend features of FR1 and/or FR2 into mid-band frequencies. In addition, higher frequency bands are currently being explored to extend 5G NR operation beyond 52.6 GHz. For example, three higher operating bands have been identified as frequency range designations FR4a or FR4-1 (52.6 GHz - 71 GHz), FR4 (52.6 GHz - 114.25 GHz), and FR5 (114.25 GHz - 300 GHz). Each of these higher frequency bands falls within the EHF band. 
     With the above aspects in mind, unless specifically stated otherwise, it should be understood that the term “sub-6 GHz” or the like if used herein may broadly represent frequencies that may be less than 6 GHz, may be within FR1, or may include mid-band frequencies. Further, unless specifically stated otherwise, it should be understood that the term “millimeter wave” or the like if used herein may broadly represent frequencies that may include mid-band frequencies, may be within FR2, FR4, FR4-a or FR4-1, and/or FR5, or may be within the EHF band. 
     A base station  102 , whether a small cell  102 ′ or a large cell (e.g., macro base station), may include and/or be referred to as an eNB, gNodeB (gNB), or another type of base station. Some base stations, such as gNB  180  may operate in a traditional sub 6 GHz spectrum, in millimeter wave frequencies, and/or near millimeter wave frequencies in communication with the UE  104 . When the gNB  180  operates in millimeter wave or near millimeter wave frequencies, the gNB  180  may be referred to as a millimeter wave base station. The millimeter wave base station  180  may utilize beamforming  182  with the UE  104  to compensate for the path loss and short range. The base station  180  and the UE  104  may each include a plurality of antennas, such as antenna elements, antenna panels, and/or antenna arrays to facilitate the beamforming. 
     The base station  180  may transmit a beamformed signal to the UE  104  in one or more transmit directions  182 ′. The UE  104  may receive the beamformed signal from the base station  180  in one or more receive directions 182″. The UE  104  may also transmit a beamformed signal to the base station  180  in one or more transmit directions. The base station  180  may receive the beamformed signal from the UE  104  in one or more receive directions. The base station  180  / UE  104  may perform beam training to determine the best receive and transmit directions for each of the base station  180  / UE  104 . The transmit and receive directions for the base station  180  may or may not be the same. The transmit and receive directions for the UE  104  may or may not be the same. 
     The EPC  160  may include a Mobility Management Entity (MME)  162 , other MMEs  164 , a Serving Gateway  166 , a Multimedia Broadcast Multicast Service (MBMS) Gateway  168 , a Broadcast Multicast Service Center (BM-SC)  170 , and a Packet Data Network (PDN) Gateway  172 . The MME  162  may be in communication with a Home Subscriber Server (HSS)  174 . The MME  162  is the control node that processes the signaling between the UEs  104  and the EPC  160 . Generally, the MME  162  provides bearer and connection management. All user Internet protocol (IP) packets are transferred through the Serving Gateway  166 , which itself is connected to the PDN Gateway  172 . The PDN Gateway  172  provides UE IP address allocation as well as other functions. The PDN Gateway  172  and the BM-SC  170  are connected to the IP Services  176 . The IP Services  176  may include the Internet, an intranet, an IP Multimedia Subsystem (IMS), a PS Streaming Service, and/or other IP services. The BM-SC  170  may provide functions for MBMS user service provisioning and delivery. The BM-SC  170  may serve as an entry point for content provider MBMS transmission, may be used to authorize and initiate MBMS Bearer Services within a public land mobile network (PLMN), and may be used to schedule MBMS transmissions. The MBMS Gateway  168  may be used to distribute MBMS traffic to the base stations  102  belonging to a Multicast Broadcast Single Frequency Network (MBSFN) area broadcasting a particular service, and may be responsible for session management (start/stop) and for collecting eMBMS related charging information. 
     The core network  190  may include an Access and Mobility Management Function (AMF)  192 , other AMFs  193 , a Session Management Function (SMF)  194 , and a User Plane Function (UPF)  195 . The AMF  192  may be in communication with a Unified Data Management (UDM)  196 . The AMF  192  is the control node that processes the signaling between the UEs  104  and the core network  190 . Generally, the AMF  192  provides QoS flow and session management. All user Internet protocol (IP) packets are transferred through the UPF  195 . The UPF  195  provides UE IP address allocation as well as other functions. The UPF  195  is connected to the IP Services  197 . The IP Services  197  may include the Internet, an intranet, an IP Multimedia Subsystem (IMS), a Packet Switch (PS) Streaming (PSS) Service, and/or other IP services. 
     The base station may include and/or be referred to as a gNB, Node B, eNB, an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), a transmit reception point (TRP), or some other suitable terminology. The base station  102  provides an access point to the EPC  160  or core network  190  for a UE  104 . Examples of UEs  104  include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a personal digital assistant (PDA), a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., MP3 player), a camera, a game console, a tablet, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a large or small kitchen appliance, a healthcare device, an implant, a sensor/actuator, a display, or any other similar functioning device. Some of the UEs  104  may be referred to as IoT devices (e.g., parking meter, gas pump, toaster, vehicles, heart monitor, etc.). The UE  104  may also be referred to as a station, a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology. In some scenarios, the term UE may also apply to one or more companion devices such as in a device constellation arrangement. One or more of these devices may collectively access the network and/or individually access the network. 
     Referring again to  FIG.  1   , in certain aspects, the UE  104  may be configured to receive an indication to update one or more PUCCH parameters based on channel conditions. For example, the UE  104  may comprise an update component  198  configured to receive an indication to update one or more PUCCH parameters based on channel conditions. The UE  104  may receive, from a base station  180 , a configuration to update one or more PUCCH parameters. The UE  104  may receive, from the base station  180 , an indication to update the one or more PUCCH parameters based at least on a change of channel conditions. The UE  104  may communicate, with the base station  180 , based on a PUCCH having the one or more PUCCH parameters updated. 
     Referring again to  FIG.  1   , in certain aspects, the base station  180  may be configured to update one or more PUCCH parameters based on channel conditions. For example, the base station  180  may comprise an update component  199  configured to update one or more PUCCH parameters based on channel conditions. The base station  180  may transmit, to a UE  104 , a configuration to update one or more PUCCH parameters. The base station  180  may identify a change of channel conditions between the UE  104  and the base station  180 . The base station  180  may transmit, to the UE  104 , an indication to update the one or more PUCCH parameters based at least on the change of the channel conditions. The base station  180  may communicate, with the UE  104 , based on a PUCCH having the one or more PUCCH parameters updated. 
     Although the following description may be focused on 5G NR, the concepts described herein may be applicable to other similar areas, such as LTE, LTE-A, CDMA, GSM, and other wireless technologies. 
       FIG.  2 A  is a diagram  200  illustrating an example of a first subframe within a 5G NR frame structure.  FIG.  2 B  is a diagram  230  illustrating an example of DL channels within a 5G NR subframe.  FIG.  2 C  is a diagram  250  illustrating an example of a second subframe within a 5G NR frame structure.  FIG.  2 D  is a diagram  280  illustrating an example of UL channels within a 5G NR subframe. The 5G NR frame structure may be frequency division duplexed (FDD) in which for a particular set of subcarriers (carrier system bandwidth), subframes within the set of subcarriers are dedicated for either DL or UL, or may be time division duplexed (TDD) in which for a particular set of subcarriers (carrier system bandwidth), subframes within the set of subcarriers are dedicated for both DL and UL. In the examples provided by  FIGS.  2 A,  2 C , the 5G NR frame structure is assumed to be TDD, with subframe 4 being configured with slot format 28 (with mostly DL), where D is DL, U is UL, and F is flexible for use between DL/UL, and subframe 3 being configured with slot format 1 (with all UL). While subframes 3, 4 are shown with slot formats 1, 28, respectively, any particular subframe may be configured with any of the various available slot formats 0-61. Slot formats 0, 1 are all DL, UL, respectively. Other slot formats 2-61 include a mix of DL, UL, and flexible symbols. UEs are configured with the slot format (dynamically through DL control information (DCI), or semi-statically/statically through radio resource control (RRC) signaling) through a received slot format indicator (SFI). Note that the description infra applies also to a 5G NR frame structure that is TDD. 
       FIGS.  2 A- 2 D  illustrate a frame structure, and the aspects of the present disclosure may be applicable to other wireless communication technologies, which may have a different frame structure and/or different channels. A frame (10 ms) may be divided into 10 equally sized subframes (1 ms). Each subframe may include one or more time slots. Subframes may also include mini-slots, which may include 7, 4, or 2 symbols. Each slot may include 14 or 12 symbols, depending on whether the cyclic prefix (CP) is normal or extended. For normal CP, each slot may include 14 symbols, and for extended CP, each slot may include 12 symbols. The symbols on DL may be CP orthogonal frequency division multiplexing (OFDM) (CP-OFDM) symbols. The symbols on UL may be CP-OFDM symbols (for high throughput scenarios) or discrete Fourier transform (DFT) spread OFDM (DFT-s-OFDM) symbols (also referred to as single carrier frequency-division multiple access (SC-FDMA) symbols) (for power limited scenarios; limited to a single stream transmission). The number of slots within a subframe is based on the CP and the numerology. The numerology defines the subcarrier spacing (SCS) and, effectively, the symbol length/duration, which is equal to 1/SCS. 
     
       
         
           
               
               
               
             
               
                 µ 
                 SCS Δƒ= 2 µ •15[kHz] 
                 Cyclic prefix 
               
             
            
               
                 0 
                 15 
                 Normal 
               
               
                 1 
                 30 
                 Normal 
               
               
                 2 
                 60 
                 Normal, Extended 
               
               
                 3 
                 120 
                 Normal 
               
               
                 4 
                 240 
                 Normal 
               
            
           
         
       
     
     For normal CP (14 symbols/slot), different numerologies µ0 to 4 allow for 1, 2, 4, 8, and 16 slots, respectively, per subframe. For extended CP, the numerology 2 allows for 4 slots per subframe. Accordingly, for normal CP and numerology µ, there are 14 symbols /slot and 2  µ slots/subframe. The subcarrier spacing may be equal to 2 µ * 15 kHz, where µ is the numerology 0 to 4. As such, the numerology µ=0 has a subcarrier spacing of 15 kHz and the numerology µ=4 has a subcarrier spacing of 240 kHz. The symbol length/duration is inversely related to the subcarrier spacing.  FIGS.  2 A- 2 D  provide an example of normal CP with 14 symbols per slot and numerology µ=2 with 4 slots per subframe. The slot duration is 0.25 ms, the subcarrier spacing is 60 kHz, and the symbol duration is approximately 16.67 µs. Within a set of frames, there may be one or more different bandwidth parts (BWPs) (see  FIG.  2 B ) that are frequency division multiplexed. Each BWP may have a particular numerology and CP (normal or extended). 
     A resource grid may be used to represent the frame structure. Each time slot includes a resource block (RB) (also referred to as physical RBs (PRBs)) that extends 12 consecutive subcarriers. The resource grid is divided into multiple resource elements (REs). The number of bits carried by each RE depends on the modulation scheme. 
     As illustrated in  FIG.  2 A , some of the REs carry reference (pilot) signals (RS) for the UE. The RS may include demodulation RS (DM-RS) (indicated as R for one particular configuration, but other DM-RS configurations are possible) and channel state information reference signals (CSI-RS) for channel estimation at the UE. The RS may also include beam measurement RS (BRS), beam refinement RS (BRRS), and phase tracking RS (PT-RS). 
       FIG.  2 B  illustrates an example of various DL channels within a subframe of a frame. The physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs) (e.g., 1, 2, 4, 8, or 16 CCEs), each CCE including six RE groups (REGs), each REG including 12 consecutive REs in an OFDM symbol of an RB. A PDCCH within one BWP may be referred to as a control resource set (CORESET). A UE is configured to monitor PDCCH candidates in a PDCCH search space (e.g., common search space, UE-specific search space) during PDCCH monitoring occasions on the CORESET, where the PDCCH candidates have different DCI formats and different aggregation levels. Additional BWPs may be located at greater and/or lower frequencies across the channel bandwidth. A primary synchronization signal (PSS) may be within symbol 2 of particular subframes of a frame. The PSS is used by a UE  104  to determine subframe/symbol timing and a physical layer identity. A secondary synchronization signal (SSS) may be within symbol 4 of particular subframes of a frame. The SSS is used by a UE to determine a physical layer cell identity group number and radio frame timing. Based on the physical layer identity and the physical layer cell identity group number, the UE can determine a physical cell identifier (PCI). Based on the PCI, the UE can determine the locations of the DM-RS. The physical broadcast channel (PBCH), which carries a master information block (MIB), may be logically grouped with the PSS and SSS to form a synchronization signal (SS)/PBCH block (also referred to as SS block (SSB)). The MIB provides a number of RBs in the system bandwidth and a system frame number (SFN). The physical downlink shared channel (PDSCH) carries user data, broadcast system information not transmitted through the PBCH such as system information blocks (SIBs), and paging messages. 
     As illustrated in  FIG.  2 C , some of the REs carry DM-RS (indicated as R for one particular configuration, but other DM-RS configurations are possible) for channel estimation at the base station. The UE may transmit DM-RS for the physical uplink control channel (PUCCH) and DM-RS for the physical uplink shared channel (PUSCH). The PUSCH DM-RS may be transmitted in the first one or two symbols of the PUSCH. The PUCCH DM-RS may be transmitted in different configurations depending on whether short or long PUCCHs are transmitted and depending on the particular PUCCH format used. The UE may transmit sounding reference signals (SRS). The SRS may be transmitted in the last symbol of a subframe. The SRS may have a comb structure, and a UE may transmit SRS on one of the combs. The SRS may be used by a base station for channel quality estimation to enable frequency-dependent scheduling on the UL. 
       FIG.  2 D  illustrates an example of various UL channels within a subframe of a frame. The PUCCH may be located as indicated in one configuration. The PUCCH carries uplink control information (UCI), such as scheduling requests, a channel quality indicator (CQI), a precoding matrix indicator (PMI), a rank indicator (RI), and hybrid automatic repeat request (HARQ) acknowledgment (ACK) (HARQ-ACK) feedback (i.e., one or more HARQ ACK bits indicating one or more ACK and/or negative ACK (NACK)). The PUSCH carries data, and may additionally be used to carry a buffer status report (BSR), a power headroom report (PHR), and/or UCI. 
       FIG.  3    is a block diagram of a base station  310  in communication with a UE  350  in an access network. In the DL, IP packets from the EPC  160  may be provided to a controller/processor  375 . The controller/processor  375  implements layer 3 and layer 2 functionality. Layer 3 includes a radio resource control (RRC) layer, and layer 2 includes a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a medium access control (MAC) layer. The controller/processor  375  provides RRC layer functionality associated with broadcasting of system information (e.g., MIB, SIBs), RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release), inter radio access technology (RAT) mobility, and measurement configuration for UE measurement reporting; PDCP layer functionality associated with header compression / decompression, security (ciphering, deciphering, integrity protection, integrity verification), and handover support functions; RLC layer functionality associated with the transfer of upper layer packet data units (PDUs), error correction through ARQ, concatenation, segmentation, and reassembly of RLC service data units (SDUs), re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto transport blocks (TBs), demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization. 
     The transmit (TX) processor  316  and the receive (RX) processor  370  implement layer 1 functionality associated with various signal processing functions. Layer 1, which includes a physical (PHY) layer, may include error detection on the transport channels, forward error correction (FEC) coding/decoding of the transport channels, interleaving, rate matching, mapping onto physical channels, modulation/demodulation of physical channels, and MIMO antenna processing. The TX processor  316  handles mapping to signal constellations based on various modulation schemes (e.g., binary phase-shift keying (BPSK), quadrature phase-shift keying (QPSK), M-phase-shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)). The coded and modulated symbols may then be split into parallel streams. Each stream may then be mapped to an OFDM subcarrier, multiplexed with a reference signal (e.g., pilot) in the time and/or frequency domain, and then combined together using an Inverse Fast Fourier Transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream. The OFDM stream is spatially precoded to produce multiple spatial streams. Channel estimates from a channel estimator  374  may be used to determine the coding and modulation scheme, as well as for spatial processing. The channel estimate may be derived from a reference signal and/or channel condition feedback transmitted by the UE  350 . Each spatial stream may then be provided to a different antenna  320  via a separate transmitter  318  TX. Each transmitter  318  TX may modulate a radio frequency (RF) carrier with a respective spatial stream for transmission. 
     At the UE  350 , each receiver  354  RX receives a signal through its respective antenna  352 . Each receiver  354  RX recovers information modulated onto an RF carrier and provides the information to the receive (RX) processor  356 . The TX processor  368  and the RX processor  356  implement layer 1 functionality associated with various signal processing functions. The RX processor  356  may perform spatial processing on the information to recover any spatial streams destined for the UE  350 . If multiple spatial streams are destined for the UE  350 , they may be combined by the RX processor  356  into a single OFDM symbol stream. The RX processor  356  then converts the OFDM symbol stream from the time-domain to the frequency domain using a Fast Fourier Transform (FFT). The frequency domain signal comprises a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbols on each subcarrier, and the reference signal, are recovered and demodulated by determining the most likely signal constellation points transmitted by the base station  310 . These soft decisions may be based on channel estimates computed by the channel estimator  358 . The soft decisions are then decoded and deinterleaved to recover the data and control signals that were originally transmitted by the base station  310  on the physical channel. The data and control signals are then provided to the controller/processor  359 , which implements layer 3 and layer 2 functionality. 
     The controller/processor  359  can be associated with a memory  360  that stores program codes and data. The memory  360  may be referred to as a computer-readable medium. In the UL, the controller/processor  359  provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, and control signal processing to recover IP packets from the EPC  160 . The controller/processor  359  is also responsible for error detection using an ACK and/or NACK protocol to support HARQ operations. 
     Similar to the functionality described in connection with the DL transmission by the base station  310 , the controller/processor  359  provides RRC layer functionality associated with system information (e.g., MIB, SIBs) acquisition, RRC connections, and measurement reporting; PDCP layer functionality associated with header compression / decompression, and security (ciphering, deciphering, integrity protection, integrity verification); RLC layer functionality associated with the transfer of upper layer PDUs, error correction through ARQ, concatenation, segmentation, and reassembly of RLC SDUs, re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto TBs, demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization. 
     Channel estimates derived by a channel estimator  358  from a reference signal or feedback transmitted by the base station  310  may be used by the TX processor  368  to select the appropriate coding and modulation schemes, and to facilitate spatial processing. The spatial streams generated by the TX processor  368  may be provided to different antenna  352  via separate transmitters 354TX. Each transmitter 354TX may modulate an RF carrier with a respective spatial stream for transmission. 
     The UL transmission is processed at the base station  310  in a manner similar to that described in connection with the receiver function at the UE  350 . Each receiver 318RX receives a signal through its respective antenna  320 . Each receiver 318RX recovers information modulated onto an RF carrier and provides the information to a RX processor  370 . 
     The controller/processor  375  can be associated with a memory  376  that stores program codes and data. The memory  376  may be referred to as a computer-readable medium. In the UL, the controller/processor  375  provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover IP packets from the UE  350 . IP packets from the controller/processor  375  may be provided to the EPC  160 . The controller/processor  375  is also responsible for error detection using an ACK and/or NACK protocol to support HARQ operations. 
     At least one of the TX processor  368 , the RX processor  356 , and the controller/processor  359  may be configured to perform aspects in connection with  198  of  FIG.  1   . 
     At least one of the TX processor  316 , the RX processor  370 , and the controller/processor  375  may be configured to perform aspects in connection with  198  of  FIG.  1   . 
     In wireless communication systems, PUCCH may be designed to support waveforms at higher frequency bands of frequency range 4 (FR4) (e.g., 70 GHz - 114 GHz), as well as for frequency range 5 (FR5) (e.g., greater than 114 GHz). The waveform should have a low peak to average power ratio (PAPR), a reduced or lower complexity than OFDM, and should be robust to phase noise. Potential contenders for the waveform may include single carrier quadrature amplitude modulation (QAM) and discreet Fourier transform (DFT) spread OFDM (DFT-s-OFDM). 
     PUCCH may comprise either coherent PUCCH with demodulation reference signal (DMRS) or non-coherent PUCCH without DMRS. A PUCCH format may be chosen by the base station and may be configured via RRC signaling. There is no adaptation as channel conditions change. Non-coherent PUCCH may perform better than coherent PUCCH in some instances, such as in low signal to interference plus noise ratio (SINR) when channel estimation with DMRS incurs a high loss or in instances of small amounts of data transmission. A non-coherent PUCCH of format 0 may not be flexible enough to adapt its indication parameters to data demands of the UE or to SINR changes. For example, in instances where it is 1 RB and only 1-2 symbols, it may not be possible to get more or less resources to support the data demands of the UE. In another example, such as in instances where the PUCCH uses a fixed computer generated sequence of size 12, which may not be optimal at all SINRs. In yet another example, if the PUCCH uses only 8 cyclic shifts to indicate information (e.g., limited to 3 bits), may not be able to exploit channel conditions to send more bits via non-orthogonal ways. 
     Aspects presented herein provide a configuration to update PUCCH parameters in certain instances. For example, the PUCCH may adapt the signaling capability in terms of the amount of bits signaled, a sequence used to signal the information, or the modes on which information may be encoded. In some instances, the PUCCH parameters may be updated based at least one changes in channel condition (e.g., SINR, RSSI), data needs of the UE (e.g., amount of bits to be signaled), or a change in the coding requirement of the UE. At least one advantage of the disclosure is that dynamic switching of PUCCH parameters may be performed via DCI or MAC-CE which may be faster than via RRC reconfiguration. At least another advantage of the disclosure is an enhanced spectral efficiency, better use of the channel condition, and increased robustness from PUCCH. 
       FIG.  4    is a diagram  400  of PUCCH configuration. PUCCH may be configured via RRC. PUCCH adaptation to SNR may be performed via an RRC reconfiguration. PUCCH parameters may be defined in the information element PUCCH-Config  402   in RRC. The PUCCH-Config  402  may refer to PUCCH-Resource  404  to define the PUCCH parameters. In some instances, a CQI report may be tied to the PUCCH resource through RRC. As such, changing the CQI reporting may be performed via RRC reconfiguration. For example, with reference to diagram  500  of  FIG.  5   , the PUCCH-CSI-Resource  502  includes reference to the PUCCH-ResourceId  504 . 
     In some instances, the PUCCH parameters to use may be indicated dynamically. For example, PUCCH parameters may be changed in response to channel conditions, the amount of bits to be transmitted by the UE, or coding requirement of the UE. This change may be done dynamically and without RRC reconfiguration. The changed PUCCH parameters may comprise one or more of the signaling capacity of a PUCCH format, the manner in which information is encoded in PUCCH, the type of PUCCH format (e.g., coherent or non-coherent), or other parameters of a PUCCH format. With reference to diagram  600  of  FIG.  6   , a single carrier symbol  602  may comprise a cyclic prefix (CP)  604  and a PUCCH sequence  606  that may be comprised of L samples  608 . 
     In some instances, the network, via a base station, may indicate a change in PUCCH parameters via DCI or MAC-CE. PUCCH resources may still be configured via RRC, but DCI or MAC-CE may allow for dynamic changing of the PUCCH parameters as needed. In some instances, the PUCCH parameters that may be updated via DCI or MAC-CE may comprise an addition to an existing PUCCH resource, overwriting one or more fields in an existing PUCCH resource, or selecting from among a set of preconfigured PUCCH resources. The addition to the existing PUCCH resource may comprise the allowed shifts of the sequence used in PUCCH to be added via DCI or MAC-CE, while other transmission parameters may be configured via RRC. The overwriting of one or more fields in the existing PUCCH resource may comprise that the type of sequence to be used may be changed from DFT to Zadoff Chu based on the SINR conditions. The selection of a set of preconfigured PUCCH resources may comprise different kinds of PUCCH formats with different parameters that are appropriate for different conditions. The network may select the resource which may be the best or appropriate for a given scenario. The network may configure resources with similar PUCCH resources but having different time-frequency resources for transmission. This may allow the network to dynamically switch where PUCCH may be transmitted based on an observed SINR. 
     In some instances, the choice of sequence used for PUCCH (e.g., non-coherent) and how the sequence is generated may be changed dynamically in response to channel conditions, the amount of bits to be transmitted by a UE, or a coding requirement of the UE. For example, the choice of the sequence may be adaptable. The sequence may be one of a DFT or Zadoff Chu sequence. A cross-correlation between different root Zadoff Chu sequences may be 1/√N whereas between DFT sequences may be 0. Thus, the root Zadoff Chu sequences may require a higher SINR than a DFT sequence to achieve the same detection performance. In addition, the sequence may be generated via sampling a larger sequence. For example, a sampled DFT sequence of length  168  may be generated by sampling a 4096 length DFT sequence. The sampling may help reduce the transmitted sequence length and the resources used. The choice of the sampling function may affect performance such that the sampling function used may also be adaptable to the channel. The sampling function may comprise at least one of linear sampling, quadratic sampling, cubic sampling, or the like. The sampling factor may correspond to the ratio of the original sequence length to sampled sequence length which may affect performance. The sampling factor may also be adaptable to the channel. For example, at a high signal to noise ratio (SNR), a sampling factor of 4096/168 may be feasible, but a low SINR may have a limit to 512/168. 
     In adapting the PUCCH sequence, there may be a tradeoff between signaling capability and SINR of operation among PUCCH sequences. For example, the amount of bits that may be transmitted using two kinds of sequences using different modes and the signal versus interference level at which they operate. Table 1 shows SINR and signaling capability tradeoff of example PUCCH sequences. 
     
       
         
          TABLE 1
           
               
               
               
               
             
               
                 Sequence Used 
                 Modes of signaling information 
                 Number of bits signaled for sequence length L with cyclic prefix length CP 
                 Interference from other sequences 
               
             
            
               
                 DFT 
                 DFT index 
                 log 2 (L) 
                 0 
               
               
                 Zadoff Chu 
                 Zadoff Chu Root 
                 log 2 (L) 
                 1/√L 
               
               
                 Zadoff Chu 
                 Zadoff Chu Root and cyclic shift 
                 log 2 (L)+ log 2 (L/CP) 
                 /√L 
               
            
           
         
       
     
     A higher signaling capability may be obtained by varying the PUCCH sequence, but may require operating under more interferences which may limit the SINR resources. 
     In some instances, sampling a sequence may reduce the length of the transmitted sequence while still conveying a similar number of bits as the original sequence but at the cost of interference. Many sampling functions may be possible, and may be optimized to the sequence and sampling factor. For example, in a MxM DFT matrix, a MxL sampled DFT matrix may be derived by selecting indices given by the sampling function f(n), as shown in Matrix 1. 
     
       
         
           
             A 
               
             = 
               
             
               
                 
                   
                     
                       
                         
                           a 
                           
                             11 
                           
                         
                       
                     
                     
                       
                         
                           a 
                           
                             12 
                           
                         
                       
                     
                     
                       … 
                     
                     
                       
                         
                           a 
                           
                             1 
                             M 
                           
                         
                       
                     
                   
                   
                     
                       
                         
                           a 
                           
                             21 
                           
                         
                       
                     
                     
                       
                         
                           a 
                           
                             22 
                           
                         
                       
                     
                     
                       … 
                     
                     
                       
                         
                           a 
                           
                             2 
                             M 
                           
                         
                       
                     
                   
                   
                     
                       ⋯ 
                     
                     
                       … 
                     
                     
                       ⋯ 
                     
                     
                       … 
                     
                   
                   
                     
                       
                         
                           a 
                           
                             M 
                             1 
                           
                         
                       
                     
                     
                       
                         
                           a 
                           
                             M 
                             2 
                           
                         
                       
                     
                     
                       … 
                     
                     
                       
                         
                           a 
                           
                             M 
                             M 
                           
                         
                       
                     
                   
                 
               
             
           
         
       
     
     In Matrix 1, the columns selected may be given by f(n) for n = 1 to L, which may result in M sequences corresponding to M rows, where each sequence may have L samples corresponding to the selected indicesf(n). A quadratic sampling function may be in the form  
     
       
         
           
             f(n) = mod 
             
               
                 a 
                 ∗ 
                 
                   
                     n 
                     ( 
                     n 
                     + 
                     b 
                     ) 
                   
                   2 
                 
                 + 
                 c 
                 , 
                 M 
               
             
             + 
             1 
           
         
       
     
     for some constants α,b, c. 
       FIG.  7    is a diagram  700  of a sampled DFT sequence detector. A sampled sequence may be smaller and thereby used less resources to transmit. For example, if M = 1024 and L = 168, then a reduction in resources needed by a factor of ~6 may be achieved. Sampled sequences may not be orthogonal anymore and hence may be susceptible to cross-correlation interference at the receiver. A detector for sampled DFT may, at  702 , circularly shift a received signal lying within a fixed L point fast Fourier transform (FFT) window by i samples. The detector may, at  704 , map the circularly shifted signal to the original sampled locations of an M point DFT sequence with a DFT index k. The detector may, at  706 , perform M point inverse FFT (IFFT). The detector may, at  708 , perform peak detection. The detector, at  710 , may repeat the process  702  through  712  for shift i = 0 to i = CP-1, and DFT index k = 0 to k = M-1. The detector, at  712 , may store the results. At  714 , among all the stored results, the result with the highest peak may be selected, and the corresponding sampled DFT sequence with index k and shift i may be detected. 
       FIGS.  8 A and  8 B  are diagrams  800 ,  810  of variations in the SINR of operation with sampling factor. Diagram  800  has a sampling factor  802  having an original length of 4096, and a sampled length of 168. Diagram  810  has a sampling factor  804  having an original length of 1024, and a sampled length of  168 . As shown in diagrams  800  and  810  of  FIGS.  8 A and  8 B , when a DFT index = 200 is detected from among 4096 possible sampled sequences (e.g., diagram  800  of  FIG.  8 A ), the interference level may be higher than when the same index is detected from among  1024  sequences (e.g., diagram  810  of  FIG.  8 B ). Thus, the sampling factor may affect the SINR of operation of PUCCH (e.g., non-coherent PUCCH). 
       FIGS.  9 A and  9 B  are diagrams  900 ,  910  of interference levels for sampled sequences. Diagram  900  has a quadratic sampling with a=1, b=1, c=3, a desired sequence  902 , and a strongest undesired sequence  904 . Diagram  910  has a quadratic sampling with a=0.2, b=1, c=3, a desired sequence  912 , and a strongest undesired sequence  914 . Interference generally saturates to the signal level as the sampling factor (e.g., original length divided by sampled length) increases, but the actual level may be highly affected by the coefficients of the sampling used. As such, the sampling function may be optimized for PUCCH. Different functions may perform better or provide better results at different sampling factors (e.g., for ≥ 2048 original length of diagram  900  with a=1 is better, but up to 1024 length of diagram  910  with a=0.2 is better). Thus, as subsampling increases, interference increases which may lead to a change in the optimum sampling factor. 
       FIG.  10    is a diagram  1000  of the highest cross-interference seen across roots of sampled DFT. The maximum interference faced by a sampled DFT index may vary widely across indices. Some indices may see quite high interference, while other indices may experience reduced levels of interference. As such, it may be beneficial to exclude some indices from transmission as their detection performance may be worse. The diagram  1000  may correspond to the output of the IFFT detector for different indices of a sampled DFT sequence, which may have an original length of  1024 , a sampled length of 168, and a quadratic sampling coefficients of a=0.2, b=1, c=3. 
     In some instances, different modes of information encoding may give different signaling capabilities, but may also operate under different interference levels. Adapting the mode of encoding information in a PUCCH sequence based on channel conditions, UE uplink data demand, or the coding requirement of the UE. For example, whether information is encoded into cyclic shifts, the index of the sequence sent, or both. The answer may depend on the combination of the chosen sequence under the given channel conditions or UE requirements. The network may also indicate, during PUCCH configuration, a baseline mode that may be appropriate for the chosen sequence. For example, information may be encoded in the index of a transmitted DFT sequence or root of a Zadoff Chu sequence. Sampling and multipath may affect the number of available indices or shifts in each mode. With reference to diagram  1100  of  FIG.  11   , for roots  1102 , may have the options of using all the roots, selecting some of the roots, or not using the roots, while for shifts  1104 , may have the options of using all the shifts, selecting some of the shifts, or not using the shifts, such that any combination may be possible. Root  1102  may also be an index of the sequence for non-Zadoff Chu sequences like DFT. Shifts  1104  may be a cyclic shift of the sequence. 
     In some instances, the network may signal to only change PUCCH parameters for some uplink messages, such as HARQ-ACK or for all uplink messages including ACK/NACK, CSF, or SR. In some instances, the network may also indicate to change between non-coherent PUCCH and coherent PUCCH as per channel conditions, the amount of bits to be signaled by the UE, and coding requirements of the UE. In some instances, the network may change the PUCCH resource used for CQI reporting via DCI or MAC-CE. This signaling combined with signaling to change PUCCH parameters may allow CQI reporting to take advantage of flexible PUCCH parameters. 
     In some instances, a PUCCH parameter switch may be triggered by one or more conditions. A base station may monitor uplink conditions via PUSCH, PUCCH, SRS or other uplink channels/signals and may decide autonomously that a better PUCCH parameter(s) may suit the current channel condition and initiates the change of the PUCCH parameter. In some instances, the switch of the parameters may be assisted by the UE. For example, the base station may request a report of downlink channel quality from the UE. This may be periodic, aperiodic, or semi-static. The base station may decide to switch the PUCCH parameters based on the report of the downlink channel quality from the UE. In some instances, the switch of the parameters may be requested by the UE. For example, the UE may request the base station for a new allocation of PUCCH. The request may indicate the type of PUCCH (e.g., length, format, etc.) that the UE would like to use. The request may be generated based on an amount of data the UE needs to send. The base station may determine whether to update the parameters based on the request from the UE. In some instances, the switch of the parameters may be performed by the UE autonomously with the base station’s permission. For example, the base station may preconfigure the UE for a set of PUCCH options and may allow the UE to select any of the set of PUCCH options based on the needs or channel assessment of the UE. The base station may monitor all PUCCH resources in the uplink, and the UE may change the PUCCH parameters based on the preconfigured set of PUCCH options. Any changed PUCCH parameters by the base station may be indicated to the UE via a new or updated PUCCH resource set via RRC, MAC-CE, or DCI. In instances where PUCCH parameters are not configured, the PUCCH parameters may be first configured via RRC, and updates may be made to the RRC configured parameters as needed. 
       FIG.  12    is a diagram  1200  of a UE initiated parameter change. The diagram  1200  includes a UE  1202  and a base station  1204 . The UE  1202  may have an initial PUCCH allocation  1206 . The UE  1202 , at  1208 , may initiate a switch of PUCCH resource. The UE  1202 , at  1210 , may have an updated or final PUCCH allocation. The base station  1204  may monitor multiple hypothesis via at least detector 1  1212  and detector 2  1214 , and the UE  1202  may transmit using resources that are specific to the new parameters. For example, the base station that monitors for both DFT and Zadoff Chu detection may detect whether the UE selected a DFT or Zadoff Chu sequence to send on the same time/frequency resources. Alternatively, the base station may monitor two separate resources for Zadoff Chu and DFT sequences and one may be successfully received. 
       FIG.  13    is a call flow diagram  1300  of signaling between a UE  1302  and a base station  1304 . The base station  1304  may be configured to provide at least one cell. The UE  1302  may be configured to communicate with the base station  1304 . For example, in the context of  FIG.  1   , the base station  1304  may correspond to base station  102 / 180  and, accordingly, the cell may include a geographic coverage area  110  in which communication coverage is provided and/or small cell  102 ′ having a coverage area  110 ′. Further, a UE  1302  may correspond to at least UE  104 . In another example, in the context of  FIG.  3   , the base station  1304  may correspond to base station  310  and the UE  1302  may correspond to UE  350 . 
     At  1306 , the base station  1304  may transmit a configuration to update one or more PUCCH parameters. The base station  1304  may transmit the configuration to update the one or more PUCCH parameters to the UE  1302 . The UE  1302  may receive the configuration to update the one or more PUCCH parameters from the base station  1304 . 
     At  1308 , the base station  1304  may identify a change of channel conditions. The base station  1304  may identify a change of channel conditions between the UE  1302  and the base station  1304 . The base station may identify the change of channel conditions based at least on SINR or received signal strength indicator (RSSI). For example, the base station may determine that the change of channel conditions may occur if SINR or RSSI may have changed or fallen below a threshold. 
     At  1310 , the UE  1302  may transmit a request for updated PUCCH parameters to the base station  1304 . The base station  1304  may receive the request for updated PUCCH parameters from the UE  1302 . In some aspects, the request for the updated PUCCH parameters may be transmitted by the UE  1302  based at least on at least one of a downlink channel condition, a number of bits for transmission by the UE, or a coding requirement of the UE. In some aspects, the updated PUCCH parameters may comprise a preferred type of a PUCCH format. 
     At  1312 , the base station  1304  may determine whether to send the updated PUCCH parameters in response to the request. For example, the request from the UE for updated PUCCH parameters may indicate the type of PUCCH (e.g., length, format) that the UE would like to use. The request from the UE may be generated based on the amount of data the UE would like to send. The base station may review the request from the UE in an effort to determine whether to send the updated PUCCH parameters. 
     At  1314 , the base station  1304  may transmit a request for at least one of an aperiodic channel report or a periodic channel report to the UE  1302 . The UE  1302  may receive the request for at least one of the aperiodic channel report of the periodic channel report from the base station  1304 . The update of the one or more PUCCH parameters may be based on the aperiodic channel report or the periodic channel report received from the UE. 
     At  1316 , the base station  1304  may transmit an indication to update the one or more PUCCH parameters to the UE  1302 . The UE  1302  may receive the indication to update the one or more PUCCH parameters from the base station  1304 . The base station may transmit the indication to update the one or more PUCCH parameters based at least on the change of the channel conditions. In some aspects, the update of the one or more PUCCH parameters may be further based on at least one of a number of bits transmitted by the UE or a coding requirement of the UE. In some aspects, the update of the one or more PUCCH parameters may comprise at least one of a signaling capability of a PUCCH format, an encoding of data within the PUCCH, or a type of a PUCCH format. In some aspects, the indication may be transmitted via DCI or MAC-CE. In some aspects, the update of the one or more PUCCH parameters may comprise an addition to an existing PUCCH resource. In some aspects, the update of the one or more PUCCH parameters may comprise a change of at least one field in an existing PUCCH resource. In some aspects, the update of the one or more PUCCH parameters may comprise a selection of the one or more PUCCH parameters from a set of pre-configured PUCCH parameters. In some aspects, the update of the one or more PUCCH parameters may comprise a change of sequence parameters for a PUCCH. The change of the sequence parameters may comprise at least one of a change of a sequence, a change of a sampling function, or a change of a sampling factor. The sampling function may be used to select a sequence of a smaller length from an original sequence. The sampling factor may correspond to a ratio of an original sequence length to a sampled sequence length. In some aspects, the update of the one or more PUCCH parameters may comprise a change of a mode of encoding information in a PUCCH sequence. In some aspects, the update of the one or more PUCCH parameters may be for one or more uplink control information of the UE. The uplink control information may comprise at least one of a HARQ ACK/NACK, a CSF, or an SR. In some aspects, the update of the one or more PUCCH parameters may comprise a switch between non-coherent PUCCH and coherent PUCCH. In some aspects, the update of PUCCH parameters may comprise a change of a PUCCH resource used for transmission of CQI report in the uplink by the UE. In some aspects, transmission of the indication to update the one or more PUCCH parameters may be based on uplink conditions or downlink channel quality reports received from the UE. In some aspects, the base station may allocate one or more PUCCH parameters for selection by the UE. 
     At  1318 , the UE  1302  may select at least one PUCCH parameter of a set of PUCCH parameters. The update of the one or more PUCCH parameters may comprise the set of PUCCH parameters. For example, the update may comprise the allocated one or more PUCCH parameters for selection by the UE. The UE may select the at least one PUCCH parameter of the set of PUCCH parameters within the update. 
     At  1320 , the base station  1304  may monitor for one or more uplink transmissions based on the updated PUCCH parameters. The base station may monitor for one or more uplink transmissions from the UE  1302  based on the updated PUCCH parameters. In some aspects, the updated one or more PUCCH parameters may comprise at least one of the set of PUCCH parameters for selection by the UE allocated by the base station. In some aspects, the updated one or more PUCCH parameters may comprise at least one of the set of PUCCH parameters indicated by the base station in response to the change of the channel conditions. 
     At  1322 , the base station  1034  and the UE  1302  may communicate based on a PUCCH having the one or more PUCCH parameters updated. The base station and the UE may communicate based on the PUCCH having the one or more PUCCH parameters updated. 
       FIG.  14    is a flowchart  1400  of a method of wireless communication. The method may be performed by a base station or a component of a base station (e.g., the base station  102 / 180 ; the apparatus  1602 ; the baseband unit  1604 , which may include the memory  376  and which may be the entire base station  310  or a component of the base station  310 , such as the TX processor  316 , the RX processor  370 , and/or the controller/processor  375 ). One or more of the illustrated operations may be omitted, transposed, or contemporaneous. The method may allow a base station to update one or more PUCCH parameters based on channel conditions. 
     At  1402 , the base station may transmit a configuration to update one or more PUCCH parameters. For example,  1402  may be performed by update component  1640  of apparatus  1602 . The base station may transmit the configuration to update the one or more PUCCH parameters to a UE. 
     At  1404 , the base station may identify a change of channel conditions. For example,  1404  may be performed by identification component  1642  of apparatus  1602 . The base station may identify a change of channel conditions between the UE and the base station. The base station may identify the change of channel conditions based at least on SINR or RSSI. For example, the base station may determine that the change of channel conditions may occur if SINR or RSSI may have changed or fallen below a threshold. 
     At  1406 , the base station may transmit an indication to update the one or more PUCCH parameters. For example,  1406  may be performed by update component  1640  of apparatus  1602 . The base station may transmit the indication to update the one or more PUCCH parameters to the UE. The base station may transmit the indication to update the one or more PUCCH parameters based at least on the change of the channel conditions. In some aspects, the update of the one or more PUCCH parameters may be further based on at least one of a number of bits transmitted by the UE or a coding requirement of the UE. In some aspects, the update of the one or more PUCCH parameters may comprise at least one of a signaling capability of a PUCCH format, an encoding of data within the PUCCH, or a type of a PUCCH format. In some aspects, the indication may be transmitted via downlink control information (DCI) or media access control (MAC) control element (CE) (MAC-CE). In some aspects, the update of the one or more PUCCH parameters may comprise an addition to an existing PUCCH resource. In some aspects, the update of the one or more PUCCH parameters may comprise a change of at least one field in an existing PUCCH resource. In some aspects, the update of the one or more PUCCH parameters may comprise a selection of the one or more PUCCH parameters from a set of pre-configured PUCCH parameters. In some aspects, the update of the one or more PUCCH parameters may comprise a change of sequence parameters for a PUCCH. The change of the sequence parameters may comprise at least one of a change of a sequence, a change of a sampling function, or a change of a sampling factor. The sampling function may be used to select a sequence of a smaller length from an original sequence. The sampling factor may correspond to a ratio of an original sequence length to a sampled sequence length. In some aspects, the sampling function may select a non-orthogonal sequence that may allow for sending more information than an orthogonal sequence but with an increased signal to interference ratio. In some aspects, the sampling function may select an orthogonal sequence that may allow for sending lesser information at an increased signal to interference ratio in comparison to a non-orthogonal sequence. In some aspects, the sampling function may select a sampling function and/or sampling function coefficients which may be optimized for a specific sequence at a specific sampling factor, which may provide an increased signal to interference ratio. In some aspects, the sampling function may select a sampling factor based at least on one or more of the channel condition, the sequence chosen, UE coding requirement, or number of bits to be transmitted by the UE. In some aspects, the update of the one or more PUCCH parameters may comprise a change of a mode of encoding information in a PUCCH sequence. In some aspects, the update of the one or more PUCCH parameters may comprise selecting the method of encoding data within PUCCH from at least one or more of roots, indices, and shifts of a sequence based on the sequence used, channel conditions, UE coding requirement, and the number of bits to be transmitted by the UE. In some aspects, the update of the one or more PUCCH parameters may comprise not transmitting specific roots, indices or shifts of a sampled PUCCH sequence based on the signal to interference level at those roots, indices or shifts being less than certain threshold. In some aspects, the update of the one or more PUCCH parameters may be for one or more uplink control information of the UE. The uplink control information may comprise at least one of a HARQ ACK/NACK, a channel state feedback (CSF), or a scheduling request (SR). In some aspects, the update of the one or more PUCCH parameters may comprise a switch between non-coherent PUCCH and coherent PUCCH. In some aspects, the update of PUCCH parameters may comprise a change of a PUCCH resource used for transmission of channel quality indicator (CQI) report in the uplink by the UE. In some aspects, transmission of the indication to update the one or more PUCCH parameters may be based on uplink conditions or downlink channel quality reports received from the UE. 
     At  1408 , the base station may communicate based on a PUCCH having the one or more PUCCH parameters updated. For example,  1408  may be performed by communication component  1650  of apparatus  1602 . The base station may communicate with the UE based on the PUCCH having the one or more PUCCH parameters updated. 
       FIG.  15    is a flowchart  1500  of a method of wireless communication. The method may be performed by a base station or a component of a base station (e.g., the base station  102 / 180 ; the apparatus  1602 ; the baseband unit  1604 , which may include the memory  376  and which may be the entire base station  310  or a component of the base station  310 , such as the TX processor  316 , the RX processor  370 , and/or the controller/processor  375 ). One or more of the illustrated operations may be omitted, transposed, or contemporaneous. The method may allow a base station to update one or more PUCCH parameters based on channel conditions. 
     At  1502 , the base station may transmit a configuration to update one or more PUCCH parameters. For example,  1502  may be performed by update component  1640  of apparatus  1602 . The base station may transmit the configuration to update the one or more PUCCH parameters to a UE. 
     At  1504 , the base station may identify a change of channel conditions. For example,  1504  may be performed by identification component  1642  of apparatus  1602 . The base station may identify a change of channel conditions between the UE and the base station. The base station may identify the change of channel conditions based on SINR or RSSI. For example, the base station may determine that the change of channel conditions may occur if SINR or RSSI may have changed or fallen below a threshold. 
     At  1506 , the base station may receive a request for updated PUCCH parameters. For example,  1506  may be performed by update component  1640  of apparatus  1602 . The base station may receive the request for the updated PUCCH parameters from the UE. In some aspects, the request for the updated PUCCH parameters may be transmitted by the UE based at least on at least one of a downlink channel condition, a number of bits for transmission by the UE, or a coding requirement of the UE. In some aspects, the updated PUCCH parameters may comprise a preferred type of a PUCCH format. 
     At  1508 , the base station may determine whether to send the updated PUCCH parameters in response to the request. For example,  1508  may be performed by update component  1640  of apparatus  1602 . For example, the request from the UE for updated PUCCH parameters may indicate the type of PUCCH (e.g., length, format) that the UE would like to use. The request from the UE may be generated based on the amount of data the UE would like to send. The base station may review the request from the UE in an effort to determine whether to send the updated PUCCH parameters. 
     At  1510 , the base station may transmit a request for at least one of an aperiodic channel report or a periodic channel report. For example,  1510  may be performed by report component  1644  of apparatus  1602 . The base station may transmit the request for at least one of the aperiodic channel report or the periodic channel report to the UE. The update of the one or more PUCCH parameters may be based on the aperiodic channel report or the periodic channel report received from the UE. 
     At  1512 , the base station may transmit an indication to update the one or more PUCCH parameters. For example,  1512  may be performed by update component  1640  of apparatus  1602 . The base station may transmit the indication to update the one or more PUCCH parameters to the UE. The base station may transmit the indication to update the one or more PUCCH parameters based at least on the change of the channel conditions. In some aspects, the update of the one or more PUCCH parameters may be further based on at least one of a number of bits transmitted by the UE or a coding requirement of the UE. In some aspects, the update of the one or more PUCCH parameters may comprise at least one of a signaling capability of a PUCCH format, an encoding of data within the PUCCH, or a type of a PUCCH format. In some aspects, the indication may be transmitted via DCI or MAC-CE. In some aspects, the update of the one or more PUCCH parameters may comprise an addition to an existing PUCCH resource. In some aspects, the update of the one or more PUCCH parameters may comprise a change of at least one field in an existing PUCCH resource. In some aspects, the update of the one or more PUCCH parameters may comprise a selection of the one or more PUCCH parameters from a set of pre-configured PUCCH parameters. In some aspects, the update of the one or more PUCCH parameters may comprise a change of sequence parameters for a PUCCH. The change of the sequence parameters may comprise at least one of a change of a sequence, a change of a sampling function, or a change of a sampling factor. The sampling function may be used to select a sequence of a smaller length from an original sequence. The sampling factor may correspond to a ratio of an original sequence length to a sampled sequence length. In some aspects, the update of the one or more PUCCH parameters may comprise a change of a mode of encoding information in a PUCCH sequence. In some aspects, the update of the one or more PUCCH parameters may be for one or more uplink control information of the UE. The uplink control information may comprise at least one of a HARQ ACK/NACK, a CSF, or an SR. In some aspects, the update of the one or more PUCCH parameters may comprise a switch between non-coherent PUCCH and coherent PUCCH. In some aspects, the update of PUCCH parameters may comprise a change of a PUCCH resource used for transmission of CQI report in the uplink by the UE. In some aspects, transmission of the indication to update the one or more PUCCH parameters may be based on uplink conditions or downlink channel quality reports received from the UE. 
     At  1514 , the base station may allocate one or more PUCCH parameters for selection. For example,  1514  may be performed by allocation component  1646  of apparatus  1602 . The base station may allocation one or more PUCCH parameters for selection by the UE. 
     At  1516 , the base station may monitor for one or more uplink transmissions based on the updated PUCCH parameters. For example,  1516  may be performed by monitor component  1648  of apparatus  1602 . The base station may monitor for one or more uplink transmissions from the UE based on the updated PUCCH parameters. The update of the one or more PUCCH parameters may comprise a set of PUCCH parameters for selection by the UE. 
     At  1518 , the base station may communicate based on a PUCCH having the one or more PUCCH parameters updated. For example,  1518  may be performed by communication component  1650  of apparatus  1602 . The base station may communicate with the UE based on the PUCCH having the one or more PUCCH parameters updated. 
       FIG.  16    is a diagram  1600  illustrating an example of a hardware implementation for an apparatus  1602 . The apparatus  1602  may be a base station, a component of a base station, or may implement base station functionality. In some aspects, the apparatus  1602  may include a baseband unit  1604 . The baseband unit  1604  may communicate through a cellular RF transceiver  1622  with the UE  104 . The baseband unit  1604  may include a computer-readable medium / memory. The baseband unit  1604  is responsible for general processing, including the execution of software stored on the computer-readable medium / memory. The software, when executed by the baseband unit  1604 , causes the baseband unit  1604  to perform the various functions described supra. The computer-readable medium / memory may also be used for storing data that is manipulated by the baseband unit  1604  when executing software. The baseband unit  1604  further includes a reception component  1630 , a communication manager  1632 , and a transmission component  1634 . The communication manager  1632  includes the one or more illustrated components. The components within the communication manager  1632  may be stored in the computer-readable medium / memory and/or configured as hardware within the baseband unit  1604 . The baseband unit  1604  may be a component of the base station  310  and may include the memory  376  and/or at least one of the TX processor  316 , the RX processor  370 , and the controller/processor  375 . 
     The communication manager  1632  includes an update component  1640  that may transmit a configuration to update one or more PUCCH parameters, e.g., as described in connection with  1402  of  FIG.  14    or  1502  of  FIG.  15   . The update component  1640  may be further configured to transmit an indication to update the one or more PUCCH parameters, e.g., as described in connection with  1406  of  FIG.  14    or  1512  of  FIG.  15   . The update component  1640  may be further configured to receive a request for updated PUCCH parameters, e.g., as described in connection with  1506  of  FIG.  15   . The update component  1640  may be further configured to determine whether to send the updated PUCCH parameters in response to the request, e.g., as described in connection with  1508  of  FIG.  15   . The communication manager  1632  further includes an identification component  1642  that may identify a change of channel conditions, e.g., as described in connection with  1404  of  FIG.  14    or  1504  of  FIG.  15   . The communication manager  1632  further includes a report component  1644  that may transmit a request for at least one of an aperiodic channel report or a periodic channel report, e.g., as described in connection with  1510  of  FIG.  15   . The communication manager  1632  further includes an allocation component  1646  that may allocate one or more PUCCH parameters for selection, e.g., as described in connection with  1514  of  FIG.  15   . The communication manager  1632  further includes a monitor component  1648  that may monitor for one or more uplink transmissions based on the updated PUCCH parameters, e.g., as described in connection with  1516  of  FIG.  15   . The communication manager  1632  further includes a communication component  1650  that may communicate based on a PUCCH having the one or more PUCCH parameters updated, e.g., as described in connection with  1408  of  FIG.  14    or  1518  of  FIG.  15   . 
     The apparatus may include additional components that perform each of the blocks of the algorithm in the flowcharts of  FIGS.  14  and  15   . As such, each block in the flowcharts of  FIGS.  14  and  15    may be performed by a component and the apparatus may include one or more of those components. The components may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by a processor configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by a processor, or some combination thereof. 
     As shown, the apparatus  1602  may include a variety of components configured for various functions. In one configuration, the apparatus  1602 , and in particular the baseband unit  1604 , includes means for transmitting, to a UE, a configuration to update one or more PUCCH parameter. The apparatus includes means for identifying a change of channel conditions between the UE and the base station. The apparatus includes means for transmitting, to the UE, an indication to update the one or more PUCCH parameters based at least on the change of the channel conditions. The apparatus includes means for communicating, with the UE, based on a PUCCH having the one or more PUCCH parameters updated. The apparatus further includes means for receiving, from the UE, a request for updated PUCCH parameters. The apparatus further includes means for determining whether to send the updated PUCCH parameters in response to the request. The apparatus further includes means for transmitting, to the UE, a request for at least one of an aperiodic or a periodic channel report. The update of the one or more PUCCH parameters is based on the aperiodic or the periodic channel report received from the UE. The apparatus further includes means for monitoring for one or more uplink transmissions based on the updated PUCCH parameters. The update of the one or more PUCCH parameters comprises a set of PUCCH parameters for selection by the UE. The apparatus further includes means for allocating one or more PUCCH parameters for selection by the UE. The apparatus further includes means for monitoring for one or more uplink transmissions based on the one or more PUCCH parameters allocated for selection by the UE. The means may be one or more of the components of the apparatus  1602  configured to perform the functions recited by the means. As described supra, the apparatus  1602  may include the TX Processor  316 , the RX Processor  370 , and the controller/processor  375 . As such, in one configuration, the means may be the TX Processor  316 , the RX Processor  370 , and the controller/processor  375  configured to perform the functions recited by the means. 
       FIG.  17    is a flowchart  1700  of a method of wireless communication. The method may be performed by a UE or a component of a UE (e.g., the UE  104 ; the apparatus  1902 ; the cellular baseband processor  1904 , which may include the memory  360  and which may be the entire UE  350  or a component of the UE  350 , such as the TX processor  368 , the RX processor  356 , and/or the controller/processor  359 ). One or more of the illustrated operations may be omitted, transposed, or contemporaneous. The method may allow a UE to receive an indication to update one or more PUCCH parameters based on channel conditions. 
     At  1702 , the UE may receive a configuration to update one or more PUCCH parameters. For example,  1702  may be performed by update component  1940  of apparatus  1902 . The UE may receive the configuration to update the one or more PUCCH parameters from a base station. 
     At  1704 , the UE may receive an indication to update the one or more PUCCH parameters. For example,  1704  may be performed by update component  1940  of apparatus  1902 . The UE may receive the indication to update the one or more PUCCH parameters from the base station. The indication to update the one or more PUCCH parameters may be transmitted to the UE based at least on a change of channel conditions. In some aspects, the update of the one or more PUCCH parameters may be further based on at least one of a number of bits transmitted by the UE or a coding requirement of the UE. In some aspects, the update of the one or more PUCCH parameters may comprise at least one of a signaling capability of a PUCCH format, an encoding of data within the PUCCH, or a type of a PUCCH format. In some aspects, the indication may be transmitted via DCI or MAC-CE. In some aspects, the update of the one or more PUCCH parameters may comprise an addition to an existing PUCCH resource. In some aspects, the update of the one or more PUCCH parameters may comprise a change of at least one field in an existing PUCCH resource. In some aspects, the update of the one or more PUCCH parameters may comprise a selection of the one or more PUCCH parameters from a set of pre-configured PUCCH parameters. In some aspects, the update of the one or more PUCCH parameters may comprise a change of sequence parameters for a PUCCH. The change of the sequence parameters may comprise at least one of a change of a sequence, a change of a sampling function, or a change of a sampling factor. The sampling function may be used to select a sequence of a smaller length from an original sequence. The sampling factor may correspond to a ratio of an original sequence length to a sampled sequence length. In some aspects, the update of the one or more PUCCH parameters may comprise a change of a mode of encoding information in a PUCCH sequence. In some aspects, the update of the one or more PUCCH parameters may be for one or more uplink control information of the UE. The uplink control information may comprise at least one of a HARQ ACK/NACK, a CSF, or a SR. In some aspects, the update of the one or more PUCCH parameters may comprise a switch between non-coherent PUCCH and coherent PUCCH. In some aspects, the update of PUCCH parameters may comprise a change of a PUCCH resource used for transmission of CQI report in the uplink by the UE. In some aspects, transmission of the indication to update the one or more PUCCH parameters may be based on uplink conditions or downlink channel quality reports received from the UE. 
     At  1706 , the UE may communicate based on a PUCCH having the one or more PUCCH parameters updated. For example,  1706  may be performed by communication component  1944  of apparatus  1902 . The UE may communicate with the base station based on the PUCCH having the one or more updated PUCCH parameters. 
       FIG.  18    is a flowchart  1800  of a method of wireless communication. The method may be performed by a UE or a component of a UE (e.g., the UE  104 ; the apparatus  1902 ; the cellular baseband processor  1904 , which may include the memory  360  and which may be the entire UE  350  or a component of the UE  350 , such as the TX processor  368 , the RX processor  356 , and/or the controller/processor  359 ). One or more of the illustrated operations may be omitted, transposed, or contemporaneous. The method may allow a UE to receive an indication to update one or more PUCCH parameters based on channel conditions. 
     At  1802 , the UE may receive a configuration to update one or more PUCCH parameters. For example,  1802  may be performed by update component  1940  of apparatus  1902 . The UE may receive the configuration to update the one or more PUCCH parameters from a base station. 
     At  1804 , the UE may transmit a request for updated PUCCH parameters. For example,  1804  may be performed by update component  1940  of apparatus  1902 . The UE may transmit the request for updated PUCCH parameters to the base station. In some aspects, the request for the updated PUCCH parameters may be transmitted by the UE based at least on at least one of a downlink channel condition, a number of bits for transmission by the UE, or a coding requirement of the UE. In some aspects, the updated PUCCH parameters may comprise a preferred type of a PUCCH format. 
     At  1806 , the UE may receive a request for at least one of an aperiodic channel report or a periodic channel report. For example,  1806  may be performed by report component  1946 . The UE may receive the request for at least one of the aperiodic channel report or the periodic channel report from the base station. The update of the one or more PUCCH parameters may be based on the aperiodic or the periodic channel report transmitted to the base station. 
     At  1808 , the UE may receive an indication to update the one or more PUCCH parameters. For example,  1808  may be performed by update component  1940  of apparatus  1902 . The UE may receive the indication to update the one or more PUCCH parameters from the base station. The indication to update the one or more PUCCH parameters may be transmitted to the UE based at least on a change of channel conditions. In some aspects, the update of the one or more PUCCH parameters may be further based on at least one of a number of bits transmitted by the UE or a coding requirement of the UE. In some aspects, the update of the one or more PUCCH parameters may comprise at least one of a signaling capability of a PUCCH format, an encoding of data within the PUCCH, or a type of a PUCCH format. In some aspects, the indication may be transmitted via DCI or MAC-CE. In some aspects, the update of the one or more PUCCH parameters may comprise an addition to an existing PUCCH resource. In some aspects, the update of the one or more PUCCH parameters may comprise a change of at least one field in an existing PUCCH resource. In some aspects, the update of the one or more PUCCH parameters may comprise a selection of the one or more PUCCH parameters from a set of pre-configured PUCCH parameters. In some aspects, the update of the one or more PUCCH parameters may comprise a change of sequence parameters for a PUCCH. The change of the sequence parameters may comprise at least one of a change of a sequence, a change of a sampling function, or a change of a sampling factor. The sampling function may be used to select a sequence of a smaller length from an original sequence. The sampling factor may correspond to a ratio of an original sequence length to a sampled sequence length. In some aspects, the update of the one or more PUCCH parameters may comprise a change of a mode of encoding information in a PUCCH sequence. In some aspects, the update of the one or more PUCCH parameters may be for one or more uplink control information of the UE. The uplink control information may comprise at least one of a HARQ ACK/NACK, a CSF, or a SR. In some aspects, the update of the one or more PUCCH parameters may comprise a switch between non-coherent PUCCH and coherent PUCCH. In some aspects, the update of PUCCH parameters may comprise a change of a PUCCH resource used for transmission of CQI report in the uplink by the UE. In some aspects, transmission of the indication to update the one or more PUCCH parameters may be based on uplink conditions or downlink channel quality reports received from the UE. 
     At  1810 , the UE may select at least one PUCCH parameter of a set of PUCCH parameters. For example,  1810  may be performed by selection component  1942  of apparatus  1902 . The update of the one or more PUCCH parameters may comprise the set of PUCCH parameters. The UE may select the at least one PUCCH parameter of the set of PUCCH parameters within the update. 
     At  1812 , the UE may communicate based on a PUCCH having the one or more PUCCH parameters updated. For example,  1812  may be performed by communication component  1944  of apparatus  1902 . The UE may communicate with the base station based on the PUCCH having the one or more updated PUCCH parameters. 
       FIG.  19    is a diagram  1900  illustrating an example of a hardware implementation for an apparatus  1902 . The apparatus  1902  may be a UE, a component of a UE, or may implement UE functionality. In some aspects, the apparatus  1902  may include a cellular baseband processor  1904  (also referred to as a modem) coupled to a cellular RF transceiver  1922 . In some aspects, the apparatus  1902  may further include one or more subscriber identity modules (SIM) cards  1920 , an application processor  1906  coupled to a secure digital (SD) card  1908  and a screen  1910 , a Bluetooth module  1912 , a wireless local area network (WLAN) module  1914 , a Global Positioning System (GPS) module  1916 , or a power supply  1918 . The cellular baseband processor  1904  communicates through the cellular RF transceiver  1922  with the UE  104  and/or BS  102 / 180 . The cellular baseband processor  1904  may include a computer-readable medium / memory. The computer-readable medium / memory may be non-transitory. The cellular baseband processor  1904  is responsible for general processing, including the execution of software stored on the computer-readable medium / memory. The software, when executed by the cellular baseband processor  1904 , causes the cellular baseband processor  1904  to perform the various functions described supra. The computer-readable medium / memory may also be used for storing data that is manipulated by the cellular baseband processor  1904  when executing software. The cellular baseband processor  1904  further includes a reception component  1930 , a communication manager  1932 , and a transmission component  1934 . The communication manager  1932  includes the one or more illustrated components. The components within the communication manager  1932  may be stored in the computer-readable medium / memory and/or configured as hardware within the cellular baseband processor  1904 . The cellular baseband processor  1904  may be a component of the UE  350  and may include the memory  360  and/or at least one of the TX processor  368 , the RX processor  356 , and the controller/processor  359 . In one configuration, the apparatus  1902  may be a modem chip and include just the baseband processor  1904 , and in another configuration, the apparatus  1902  may be the entire UE (e.g., see  350  of  FIG.  3   ) and include the additional modules of the apparatus  1902 . 
     The communication manager  1932  includes an update component  1940  that is configured to receive a configuration to update one or more PUCCH parameters, e.g., as described in connection with  1702  of  FIG.  17    or  1802  of  FIG.  18   . The update component  1940  may be further configured to receive an indication to update the one or more PUCCH parameters, e.g., as described in connection with  1704  of  FIG.  17    or  1804  of  FIG.  18   . The update component  1940  may be further configured to receive an indication to update the one or more PUCCH parameters, e.g., as described in connection with  1808  of  FIG.  18   . The communication manager  1932  further includes a selection component  1942  that is configured to select at least one PUCCH parameter of a set of PUCCH parameters, e.g., as described in connection with  1810  of  FIG.  18   . The communication manager  1932  further includes a communication component  1944  that is configured to communicate based on a PUCCH having the one or more PUCCH parameters updated, e.g., as described in connection with  1706  of  FIG.  17    or  1812  of  FIG.  18   . The communication manager  1932  further includes a report component  1946  that is configured to receive a request for at least one of an aperiodic channel report or a periodic channel report, e.g., as described in connection with  1806  of  FIG.  18   . 
     The apparatus may include additional components that perform each of the blocks of the algorithm in the flowcharts of  FIGS.  17  and  18   . As such, each block in the flowcharts of  FIGS.  17  and  18    may be performed by a component and the apparatus may include one or more of those components. The components may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by a processor configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by a processor, or some combination thereof. 
     As shown, the apparatus  1902  may include a variety of components configured for various functions. In one configuration, the apparatus  1902 , and in particular the cellular baseband processor  1904 , includes means for receiving, from a base station, a configuration to update one or more PUCCH parameters. The apparatus includes means for receiving, from the base station, an indication to update the one or more PUCCH parameters based at least on a change of channel conditions. The apparatus includes means for communicating, with the base station, based on a PUCCH having the one or more PUCCH parameters updated. The apparatus further includes means for transmitting, to the base station, a request for updated PUCCH parameters. The apparatus further includes means for receiving, from the base station, a request for at least one of an aperiodic or a periodic channel report. The update of the one or more PUCCH parameters is based on the aperiodic or the periodic channel report transmitted to the base station. The apparatus further includes means for selecting at least one PUCCH parameter of the set of PUCCH parameters within the update. The means may be one or more of the components of the apparatus  1902  configured to perform the functions recited by the means. As described supra, the apparatus  1902  may include the TX Processor  368 , the RX Processor  356 , and the controller/processor  359 . As such, in one configuration, the means may be the TX Processor  368 , the RX Processor  356 , and the controller/processor  359  configured to perform the functions recited by the means. 
     It is understood that the specific order or hierarchy of blocks in the processes / flowcharts disclosed is an illustration of example approaches. Based upon design preferences, it is understood that the specific order or hierarchy of blocks in the processes / flowcharts may be rearranged. Further, some blocks may be combined or omitted. The accompanying method claims present elements of the various blocks in a sample order, and are not meant to be limited to the specific order or hierarchy presented. 
     The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects. Thus, the claims are not intended to be limited to the aspects shown herein, but is to be accorded the full scope consistent with the language claims, wherein reference to an element in the singular is not intended to mean “one and only one” unless specifically so stated, but rather “one or more.” Terms such as “if,” “when,” and “while” should be interpreted to mean “under the condition that” rather than imply an immediate temporal relationship or reaction. That is, these phrases, e.g., “when,” do not imply an immediate action in response to or during the occurrence of an action, but simply imply that if a condition is met then an action will occur, but without requiring a specific or immediate time constraint for the action to occur. The word “exemplary” is used herein to mean “serving as an example, instance, or illustration.” Any aspect described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other aspects. Unless specifically stated otherwise, the term “some” refers to one or more. Combinations such as “at least one of A, B, or C,” “one or more of A, B, or C,” “at least one of A, B, and C,” “one or more of A, B, and C,” and “A, B, C, or any combination thereof” include any combination of A, B, and/or C, and may include multiples of A, multiples of B, or multiples of C. Specifically, combinations such as “at least one of A, B, or C,” “one or more of A, B, or C,” “at least one of A, B, and C,” “one or more of A, B, and C,” and “A, B, C, or any combination thereof” may be A only, B only, C only, A and B, A and C, B and C, or A and B and C, where any such combinations may contain one or more member or members of A, B, or C. All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims. The words “module,” “mechanism,” “element,” “device,” and the like may not be a substitute for the word “means.” As such, no claim element is to be construed as a means plus function unless the element is expressly recited using the phrase “means for.” 
     The following aspects are illustrative only and may be combined with other aspects or teachings described herein, without limitation. 
     Aspect 1 is an apparatus for wireless communication at a base station including at least one processor coupled to a memory and configured to transmit, to a UE, a configuration to update one or more PUCCH parameters; identify a change of channel conditions between the UE and the base station; transmit, to the UE, an indication to update the one or more PUCCH parameters based at least on the change of the channel conditions; and communicate, with the UE, based on a PUCCH having the one or more PUCCH parameters updated. 
     Aspect 2 is the apparatus of aspect 1, further including a transceiver coupled to the at least one processor. 
     Aspect 3 is the apparatus of any of aspects 1 and 2, further includes that the update of the one or more PUCCH parameters is further based on at least one of a number of bits transmitted by the UE, a coding requirement of the UE, or a channel condition seen by the UE. 
     Aspect 4 is the apparatus of any of aspects 1-3, further includes that the update of the one or more PUCCH parameters comprises at least one of a signaling capability of a PUCCH format, an encoding of data within the PUCCH, or a type of a PUCCH format. 
     Aspect 5 is the apparatus of any of aspects 1-4, further includes that the indication is transmitted via DCI or MAC-CE. 
     Aspect 6 is the apparatus of any of aspects 1-5, further includes that the update of the one or more PUCCH parameters comprises an addition to an existing PUCCH resource. 
     Aspect 7 is the apparatus of any of aspects 1-6, further includes that the update of the one or more PUCCH parameters comprises a change of at least one field in an existing PUCCH resource. 
     Aspect 8 is the apparatus of any of aspects 1-7, further includes that the update of the one or more PUCCH parameters comprises a selection of the one or more PUCCH parameters from a set of pre-configured PUCCH parameters. 
     Aspect 9 is the apparatus of any of aspects 1-8, further includes that the update of the one or more PUCCH parameters comprises a change of sequence parameters for the PUCCH. 
     Aspect 10 is the apparatus of any of aspects 1-9, further includes that the change of the sequence parameters comprises at least one of a change of a sequence, a change of a sampling function, or a change of a sampling factor, wherein the sampling function is used to select a sequence of a smaller length from an original sequence, and wherein the sampling factor corresponds to a ratio of an original sequence length to a sampled sequence length. 
     Aspect 11 is the apparatus of any of aspects 1-10, further includes that the update of the one or more PUCCH parameters comprises a change of a mode of encoding information in a PUCCH sequence. 
     Aspect 12 is the apparatus of any of aspects 1-11, further includes that the update of the one or more PUCCH parameters is for one or more uplink control information of the UE, wherein the uplink control information comprises at least one of a HARQ ACK/NACK, a CSF, or a SR. 
     Aspect 13 is the apparatus of any of aspects 1-12, further includes that the update of the one or more PUCCH parameters comprises a switch between non-coherent PUCCH and coherent PUCCH. 
     Aspect 14 is the apparatus of any of aspects 1-13, further includes that the update of PUCCH parameters comprises a change of a PUCCH resource used for transmission of CQI report in uplink by the UE. 
     Aspect 15 is the apparatus of any of aspects 1-14, further includes that transmission of the indication to update the one or more PUCCH parameters is based on uplink conditions or downlink channel quality reports received from the UE. 
     Aspect 16 is the apparatus of any of aspects 1-15, further includes that the at least one processor is further configured to receive, from the UE, a request for updated PUCCH parameters; and determine whether to send the updated PUCCH parameters in response to the request. 
     Aspect 17 is the apparatus of any of aspects 1-16, further includes that the request for the updated PUCCH parameters is transmitted by the UE based at least on at least one of a downlink channel condition, a number of bits for transmission by the UE, or a coding requirement of the UE. 
     Aspect 18 is the apparatus of any of aspects 1-17, further includes that an update of the one or more PUCCH parameters comprises a preferred type of a PUCCH format. 
     Aspect 19 is the apparatus of any of aspects 1-18, further includes that the at least one processor is further configured to transmit, to the UE, a request for at least one of an aperiodic or a periodic channel report, wherein an update of the one or more PUCCH parameters is based on the channel report received from the UE. 
     Aspect 20 is the apparatus of any of aspects 1-19, further includes that the at least one processor is further configured to monitor for one or more uplink transmissions based on the updated PUCCH parameters, wherein an update of the one or more PUCCH parameters comprises a set of PUCCH parameters for selection by the UE. 
     Aspect 21 is the apparatus of any of aspects 1-20, further includes that the at least one processor is further configured to allocate one or more PUCCH parameters for selection by the UE; and monitor for one or more uplink transmissions based on the one or more PUCCH parameters allocated for selection by the UE. 
     Aspect 22 is a method of wireless communication for implementing any of aspects 1-21. 
     Aspect 23 is an apparatus for wireless communication including means for implementing any of aspects 1-21. 
     Aspect 24 is a computer-readable medium storing computer executable code, where the code when executed by a processor causes the processor to implement any of aspects 1-21. 
     Aspect 25 is an apparatus for wireless communication at a UE including at least one processor coupled to a memory and configured to receive, from a base station, a configuration to update one or more PUCCH parameters; receive, from the base station, an indication to update the one or more PUCCH parameters based at least on a change of channel conditions; and communicate, with the base station, based on a PUCCH having the one or more PUCCH parameters updated. 
     Aspect 26 is the apparatus of aspect 25, further including a transceiver coupled to the at least one processor. 
     Aspect 27 is the apparatus of any of aspects 25 and 26, further includes that the at least one processor is further configured to transmit, to the base station, a request for updated PUCCH parameters. 
     Aspect 28 is the apparatus of any of aspects 25-27, further includes that the request for the updated PUCCH parameters is transmitted based at least on at least one of a downlink channel condition, a number of bits for transmission by the UE, or a coding requirement of the UE. 
     Aspect 29 is the apparatus of any of aspects 25-28, further includes that the at least one processor is further configured to receive, from the base station, a request for a channel report, wherein the update of the one or more PUCCH parameters is based on the channel report transmitted to the base station. 
     Aspect 30 is the apparatus of any of aspects 25-29, further includes that the update of the one or more PUCCH parameters comprises a set of PUCCH parameters, further includes that the at least one processor is further configured to select at least one PUCCH parameter of the set of PUCCH parameters within the update. 
     Aspect 31 is a method of wireless communication for implementing any of aspects 25-30. 
     Aspect 32 is an apparatus for wireless communication including means for implementing any of aspects 25-30. 
     Aspect 33 is a computer-readable medium storing computer executable code, where the code when executed by a processor causes the processor to implement any of aspects 25-30.