Configurable cyclic prefix length for single-carrier waveforms

Abstract

Methods, systems, and apparatus for wireless communication are described. Some systems can support wireless communication in high-frequency millimeter-wave (mmW) bands, such as frequency range 4 (FR4) or other frequency ranges. To support such communication, a base station can dynamically configure the cyclic prefix (CP) length for single-carrier waveform communication. The base station can determine the CP length to handle beam switching delay, physical propagation channel delay spread, or both. In some examples, a user equipment (UE) can provide feedback to the base station, and the base station can configure the UE with the CP length based on the feedback. The base station can send a configuration message to the UE indicating the configured CP length. A single-carrier waveform with the configured CP length can maintain symbol-level alignment with other supported waveforms, such as orthogonal frequency division multiplexing (OFDM) waveforms.

Description

[0001] Cross-references

[0002] This patent application claims priority to U.S. Patent Application No. 17 / 161,643, filed January 28, 2021, entitled “CONFIGURABLE CYCLIC PREFIX LENGTHS FORSINGLE CARRIERWAVEFORMS”, by Ma et al., which has been assigned to the assignee of this application and is expressly incorporated herein by reference. Technical Field

[0003] The following discussion relates to wireless communication, including configurable cyclic prefix (CP) lengths for single-carrier waveforms. Background Technology

[0004] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, and broadcasting. These systems can support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth-generation (4G) systems (e.g., Long Term Evolution (LTE) systems, improved LTE (LTE-A) systems, or LTE-A Pro systems) and fifth-generation (5G) systems (which may be referred to as New Radio (NR) systems). These systems can employ technologies such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), or Discrete Fourier Transform Extended Orthogonal Frequency Division Multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include one or more base stations or one or more network access nodes, each base station or network access node simultaneously supporting communication with multiple communication devices (which may also be referred to as User Equipment (UE)).

[0005] In some wireless communication systems, wireless devices may use a cyclic prefix (CP) in Orthogonal Frequency Division Multiplexing (OFDM) signal generation. In some frequency bands (e.g., relatively high bands, such as the 60 GHz band and above), multiple communication factors can determine the minimum CP length for the OFDM signal. Using a single CP length or a relatively small set of CP lengths (e.g., normal and extended CP lengths) can reduce communication flexibility, leading to inefficient resource utilization. Furthermore, using different CP lengths for OFDM waveforms can result in different numbers of symbols per time slot. Such symbol-level misalignment can reduce the compatibility of wireless devices in a wireless network. For example, if different wireless devices operate with different symbol-level alignments in a time slot, the network may fail to efficiently schedule communication and share the frequency band among different wireless devices. Summary of the Invention

[0006] The described technology relates to improved methods, systems, devices, and apparatuses supporting configurable cyclic prefix (CP) lengths for single-carrier waveforms. In summary, the described technology specifies that a network dynamically configures the CP length for single-carrier waveform communication to accommodate one or more communication factors, such as delay spread for the physical propagation channel, beam switching delay, operating carrier-to-interference-plus-noise ratio (CINR), or any combination of these or other factors. For example, some systems may support wireless communication in relatively high-frequency millimeter-wave (mmW) bands, such as Frequency Range 4 (FR4) or other frequency ranges (e.g., 60 GHz and above). To support such communication, a base station can dynamically configure the CP length for single-carrier waveform communication. The base station can send a configuration message to a user equipment (UE) indicating the configured CP length. In some examples, the UE can provide channel feedback information to the base station, and the base station can configure the UE with the CP length based on the feedback. The single-carrier waveform with the configured CP length can maintain symbol-level alignment with other supported waveforms, such as orthogonal frequency division multiplexing (OFDM) waveforms. Using configurable CP lengths and OFDM waveforms to maintain symbol-level alignment between single-carrier waveforms can support compatibility between wireless devices and scheduling of wireless devices using single-carrier waveforms versus those using OFDM waveforms in the same frequency band of a wireless communication system.

[0007] A method for wireless communication at a UE is described. The method may include: receiving a configuration message indicating a UE-specific CP length for communicating with a base station; and communicating with the base station using a single-carrier waveform and a CP based on the UE-specific CP length, wherein the communication includes: transmitting or receiving signals in one or more symbols, the one or more symbols being aligned in the time domain with one or more corresponding symbols of a reference OFDM waveform.

[0008] An apparatus for wireless communication is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to: receive a configuration message indicating a UE-specific CP length for communicating with a base station; and communicate with the base station using a single-carrier waveform and a CP based on the UE-specific CP length, wherein the communication includes: transmitting or receiving signals in one or more symbols, the one or more symbols being aligned in the time domain with one or more corresponding symbols of a reference OFDM waveform.

[0009] Another apparatus for wireless communication is described. The apparatus may include: a unit for receiving a configuration message indicating a UE-specific CP length for communicating with a base station; and a unit for communicating with the base station using a single-carrier waveform and a CP based on the UE-specific CP length, wherein the communication includes: transmitting or receiving signals in one or more symbols, the one or more symbols being aligned in the time domain with one or more corresponding symbols of a reference OFDM waveform.

[0010] A non-transitory computer-readable medium is described, storing code for wireless communication at a UE. The code may include instructions executable by a processor to: receive a configuration message indicating a UE-specific CP length for communicating with a base station; and communicate with the base station using a single-carrier waveform and a CP based on the UE-specific CP length, wherein the communication includes: transmitting or receiving signals in one or more symbols aligned in the time domain with one or more corresponding symbols of a reference OFDM waveform.

[0011] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the communication may include operations, features, units, or instructions for performing the following: inserting the CP into each of the one or more symbols based on channel delay spread; and transmitting the signal after the insertion of the CP.

[0012] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the communication may include operations, features, units, or instructions for performing: determining a symbol corresponding to a beam-switching operation; inserting the CP into the determined symbol based on a beam-switching delay for the beam-switching operation; and transmitting the signal after the insertion of the CP.

[0013] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following: determining that the beam switching delay is greater than a nominal CP length associated with a digital scheme for the radio access technology (RAT) for the UE, wherein the symbol corresponding to the beam switching operation is determined based on the beam switching delay being greater than the nominal CP length, and the CP is inserted based on the beam switching delay being greater than the nominal CP length.

[0014] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing: determining a nominal CP length based on a RAT-based digital scheme; and avoiding using the nominal CP length for the CP based on receiving a configuration message indicating the UE-specific CP length.

[0015] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, the communication may include operations, features, units or instructions for: receiving the signal; and performing an FFT on the signal using a Fast Fourier Transform (FFT) size, wherein the FFT size may be the same for the UE-specific CP length and the nominal CP length.

[0016] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the CP comprises a set of multiple zero samples. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the UE-specific CP length may be greater than the nominal CP length associated with the digital scheme of the RAT used for the UE.

[0017] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the UE-specific CP length may be smaller than the nominal CP length associated with the digital scheme of the RAT used for the UE, and may be based on the Discrete Fourier Transform (DFT) size. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the communication may include operations, features, units, or instructions for: receiving the signal; and performing a DFT on the signal using the DFT size and based on the UE-specific CP length.

[0018] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for sending a feedback message to the base station, wherein the UE-specific CP length may be based on the feedback message.

[0019] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following: measuring the channel delay spread between the base station and the UE, wherein the feedback message indicates the measured channel delay spread, and the UE-specific CP length may be based on the measured channel delay spread.

[0020] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following: determining a channel delay spread index from a lookup table based on a measured channel delay spread, wherein the feedback message includes the channel delay spread index.

[0021] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, the UE-specific CP length includes a first CP length, and the methods, apparatuses, and nontransitory computer-readable media may also include operations, features, elements, or instructions for determining a second CP length from a configured set of CP lengths, wherein the feedback message includes a request for the second CP length, and the first CP length may be based on the second CP length.

[0022] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the feedback message includes a channel state information (CSI) feedback message.

[0023] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the configuration message further indicates a bandwidth portion (BWP) configuration, which includes at least one or more associations between one or more BWPs and one or more CP lengths, and the methods, apparatuses, and non-transitory computer-readable media may also include operations, features, elements, or instructions for performing the following: determining a BWP for communication among the one or more BWPs; and determining the UE-specific CP length based on the association between the determined BWP and the UE-specific CP length in the one or more associations.

[0024] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, the configuration message indicates an active period for the UE-specific CP length, and the methods, apparatuses, and nontransitory computer-readable media may also include operations, features, elements, or instructions for communicating using the UE-specific CP length during the active period.

[0025] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing: determining the expiration of the activity period; and communicating using a nominal CP length associated with a digital scheme for the RAT used by the UE based on the expiration of the activity period.

[0026] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the configuration message includes an index value corresponding to the UE-specific CP length in a set of configured CP lengths.

[0027] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the configuration message includes an absolute length value of the UE-specific CP length.

[0028] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, the UE-specific CP length may be based on channel delay spread, operational CINR, beam switching gap threshold, phase noise reduction threshold, or a combination thereof.

[0029] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the configuration messages include downlink control information (DCI) messages, media access control elements (MAC-CE), radio resource control (RRC) messages, or combinations thereof.

[0030] A method for wireless communication at a base station is described. The method may include: sending a configuration message to a UE, the configuration message including a UE-specific CP length; and communicating with the UE using a single-carrier waveform and a CP based on the UE-specific CP length, wherein the communication includes: transmitting or receiving signals in one or more symbols, the one or more symbols being aligned in the time domain with one or more corresponding symbols of a reference OFDM waveform.

[0031] An apparatus for wireless communication is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to: send a configuration message to a UE, the configuration message including a UE-specific CP length; and communicate with the UE using a single-carrier waveform and a CP based on the UE-specific CP length, wherein the communication includes: transmitting or receiving signals in one or more symbols, the one or more symbols being aligned in the time domain with one or more corresponding symbols of a reference OFDM waveform.

[0032] Another apparatus for wireless communication is described. The apparatus may include: a unit for sending a configuration message to a UE, the configuration message including a UE-specific CP length; and a unit for communicating with the UE using a single-carrier waveform and a CP based on the UE-specific CP length, wherein the communication includes: transmitting or receiving signals in one or more symbols, the one or more symbols being aligned in the time domain with one or more corresponding symbols of a reference OFDM waveform.

[0033] A non-transitory computer-readable medium is described, storing code for wireless communication at a base station. The code may include instructions executable by a processor to: send a configuration message to a UE, the configuration message including a UE-specific CP length; and communicate with the UE using a single-carrier waveform and a CP based on the UE-specific CP length, wherein the communication includes: transmitting or receiving signals in one or more symbols, the one or more symbols being aligned in the time domain with one or more corresponding symbols of a reference OFDM waveform.

[0034] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing one or more channel measurements for one or more uplink signals; and determining the UE-specific CP length based on the one or more channel measurements.

[0035] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following: receiving a feedback message from the UE; and determining the UE-specific CP length based on the feedback message.

[0036] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for determining the UE-specific CP length based on channel delay spread, operational CINR, beam switching gap threshold, phase noise reduction threshold, or a combination thereof.

[0037] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the CP comprises a set of multiple zero samples, and the communication may include operations, features, units, or instructions for: inserting the CP into the one or more symbols; maintaining phase continuity in conjunction with the insertion of the CP; and transmitting the signal based on the insertion of the CP and maintaining the phase continuity. Attached Figure Description

[0038] Figure 1 and 2 Examples of wireless communication systems supporting configurable cyclic prefix (CP) lengths for single-carrier waveforms are shown, according to various aspects of this disclosure.

[0039] Figure 3 An example is shown that supports CP insertion of configurable CP length for single-carrier waveforms to handle beam switching symbols according to various aspects of this disclosure.

[0040] Figure 4 An example is shown that supports CP insertion of configurable CP length for single-carrier waveforms to handle channel delay spread, according to various aspects of this disclosure.

[0041] Figure 5 An example of a process flow supporting configurable CP lengths for single-carrier waveforms is shown, according to various aspects of this disclosure.

[0042] Figure 6 and 7 A block diagram is shown that supports a device for a configurable CP length for a single-carrier waveform according to various aspects of this disclosure.

[0043] Figure 8 A block diagram is shown that supports a communication manager for a configurable CP length for a single-carrier waveform, according to various aspects of this disclosure.

[0044] Figure 9 A diagram of a system including a device supporting a configurable CP length for a single-carrier waveform is shown, according to various aspects of this disclosure.

[0045] Figure 10 and 11 A block diagram is shown that supports a device for a configurable CP length for a single-carrier waveform according to various aspects of this disclosure.

[0046] Figure 12 A block diagram is shown that supports a communication manager for a configurable CP length for a single-carrier waveform, according to various aspects of this disclosure.

[0047] Figure 13 A diagram of a system including a device supporting a configurable CP length for a single-carrier waveform is shown, according to various aspects of this disclosure.

[0048] Figures 14 to 17 A flowchart illustrating a method for supporting a configurable CP length for a single-carrier waveform according to various aspects of this disclosure is shown. Detailed Implementation

[0049] In some wireless communication systems, wireless devices may use a cyclic prefix (CP) in Orthogonal Frequency Division Multiplexing (OFDM) signal generation. In some frequency bands (e.g., relatively high bands, such as the 60 GHz band and above), multiple communication factors can determine the threshold CP length for the OFDM signal. Using a single CP length or a relatively small set of CP lengths (e.g., normal and extended CP lengths) may reduce communication flexibility, leading to inefficient resource utilization. Furthermore, using different CP lengths for OFDM waveforms may result in different numbers of symbols per time slot. Such symbol-level misalignment may reduce the compatibility of wireless devices in a wireless network. For example, if different wireless devices operate with different symbol-level alignments in a time slot, the network may fail to efficiently schedule communication and share the frequency band among different wireless devices. Additionally, wireless devices switching between waveforms using different symbol-level alignments may inefficiently utilize available resources during the handover process due to symbol-level misalignment.

[0050] Some wireless communication systems can support configurable CP lengths for single-carrier waveforms to accommodate one or more communication factors. For example, a wireless communication system can support single-carrier waveform communication in a relatively high-frequency band, OFDM waveform communication in a relatively high-frequency band, or both. In contrast to OFDM waveforms, single-carrier waveforms can support flexible CP configurations. For example, a single-carrier waveform can include a dynamically configured CP length (e.g., a UE-specific CP length) while maintaining frame alignment, slot alignment, and symbol-level alignment with other waveforms, such as OFDM waveforms. Therefore, wireless communication systems implementing configurable CP lengths for single-carrier waveforms can support different wireless devices communicating in the same frequency band (e.g., a relatively high-frequency band) using single-carrier waveforms with configured CP lengths and using OFDM waveforms, while maintaining compatibility and scheduling flexibility based on symbol-level alignment between single-carrier and OFDM waveforms. Additionally, wireless devices can use common digital schemes to allow for a unified transceiver design to transmit both single-carrier waveforms and OFDM waveforms with configured CP lengths. For example, wireless devices can use the same sampling rate, the same Fast Fourier Transform (FFT) size, or both, to transmit single-carrier waveforms (e.g., with configurable CP lengths) and OFDM waveforms. Therefore, in some cases, wireless devices can efficiently switch between using single-carrier waveforms with configurable CP lengths and using OFDM waveforms while maintaining the same symbol-level alignment and the same transceiver design.

[0051] The base station can configure the UE with a UE-specific CP length for a single-carrier waveform. For example, the base station can determine the CP length based on one or more metrics, such as channel delay spread, beam switching delay, or other metrics. In some examples, the base station can measure one or more uplink channel metrics and select the CP length based on these measurements. Alternatively, the UE can send a feedback message to the base station indicating delay spread, a requested CP length, or both, and the base station can determine the CP length based on the feedback message. The base station can send a configuration message to the UE indicating the CP length configured for the UE. The UE can receive the configuration message and can communicate using a CP with the configured CP length. For example, the UE can communicate with the base station by transmitting or receiving signals in one or more symbols using a single-carrier waveform and a CP with the indicated CP length. One or more symbols transmitting signals thereon can be aligned in the time domain with one or more corresponding symbols for another waveform (e.g., a reference waveform) (such as an OFDM waveform) supported in the same frequency band. The UE, base station, or both may insert a CP with a configured CP length into a beam-switching symbol to mitigate beam-switching delay, into each symbol in the symbol set to mitigate channel delay spread, or both.

[0052] First, aspects of this disclosure are described within the context of a wireless communication system. Additional aspects of this disclosure are described with reference to CP insertion for handling beam switching symbols and CP length configuration for handling delay spread. Aspects of this disclosure are further illustrated by apparatus diagrams, system diagrams, and flowcharts relating to configurable CP lengths for single-carrier waveforms, and are described with reference to these diagrams.

[0053] Figure 1 Examples of a wireless communication system 100 supporting configurable CP lengths for single-carrier waveforms according to various aspects of this disclosure are shown. The wireless communication system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a Long Term Evolution (LTE) network, an improved LTE (LTE-A) network, an LTE-A Pro network, or a New Radio (NR) network. In some examples, the wireless communication system 100 may support enhanced broadband communication, ultra-reliable (e.g., mission-critical) communication, low-latency communication, or communication with low-cost and low-complexity devices, or any combination thereof.

[0054] Base stations 105 can be distributed throughout a geographical area to form a wireless communication system 100, and can be devices of different forms or with different capabilities. Base stations 105 and UE 115 can communicate wirelessly via one or more communication links 125. Each base station 105 can provide a coverage area 110, and UE 115 and base station 105 can establish one or more communication links 125 on the coverage area 110. Coverage area 110 can be an example of a geographical area where base station 105 and UE 115 can support signal transmission according to one or more radio access technologies.

[0055] UE 115 can be distributed throughout the entire coverage area 110 of the wireless communication system 100, and each UE 115 can be stationary, mobile, or both at different times. UE 115 can be devices of different forms or with different capabilities. Figure 1 Some example UE 115s are shown in the document. The UE 115 described herein is capable of communicating with various types of devices, such as other UE 115s, base station 105, or network devices (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network devices), such as... Figure 1 As shown.

[0056] Base station 105 can communicate with core network 130, communicate with each other, or perform both of these operations. For example, base station 105 can interface with core network 130 via one or more backhaul links 120 (e.g., via S1, N2, N3, or other interfaces). Base station 105 can communicate with each other directly (e.g., directly between base stations 105) on backhaul links 120 (e.g., via X2, Xn, or other interfaces), or indirectly (e.g., via core network 130), or perform both of these operations. In some examples, backhaul link 120 can be or includes one or more radio links.

[0057] One or more of the base stations 105 described herein may include, or may be referred to by those skilled in the art as, base station transceiver, radio base station, access point, radio transceiver, node B, evolved node B (eNB), next-generation node B or gigabit node B (any of which may be referred to as gNB), home node B, home evolved node B, or some other suitable term.

[0058] UE 115 may include or be referred to as a mobile device, wireless device, remote device, handheld device, or subscriber device, or some other suitable term, wherein "device" may also be referred to as a unit, station, terminal, or client, and other examples. UE 115 may also include or be referred to as a personal electronic device, such as a cellular phone, personal digital assistant (PDA), tablet computer, laptop computer, or personal computer. In some examples, UE 115 may include or be referred to as a wireless local loop (WLL) station, Internet of Things (IoT) device, Internet of Everything (IoE) device, or machine-type communication (MTC) device, and other examples, which may be implemented in various articles such as electrical appliances, vehicles, meters, and other examples.

[0059] The UE 115 described in this document can communicate with various types of devices, such as other UE 115s that can sometimes act as repeaters, as well as base station 105 and network devices, including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, and other examples, such as... Figure 1 As shown.

[0060] UE 115 and base station 105 can wirelessly communicate with each other via one or more communication links 125 on one or more carriers. The term "carrier" can refer to a set of radio frequency spectrum resources having a defined physical layer structure for supporting communication link 125. For example, a carrier for communication link 125 may include a portion of a radio frequency spectrum band (e.g., a bandwidth portion (BWP)) that operates according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling coordinating operation for the carrier, user data, or other signaling. Wireless communication system 100 can support communication with UE 115 using carrier aggregation or multi-carrier operation. Depending on the carrier aggregation configuration, UE 115 can be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation can be used in conjunction with both frequency division duplex (FDD) component carriers and time division duplex (TDD) component carriers.

[0061] In some examples (e.g., in a carrier aggregation configuration), the carrier may also have acquisition or control signaling that coordinates operation against other carriers. The carrier may be associated with a frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute Radio Frequency Channel Number (EARFCN)) and may be positioned according to a channel grid for discovery by UE 115. The carrier may operate in standalone mode, where UE 115 performs initial acquisition and connection via the carrier, or the carrier may operate in non-standalone mode, where different carriers (e.g., the same or different radio access technologies) are used to anchor the connection.

[0062] The communication link 125 shown in the wireless communication system 100 may include uplink transmission from UE 115 to base station 105, or downlink transmission from base station 105 to UE 115. The carrier may carry either downlink or uplink communication (e.g., in FDD mode) or may be configured to carry both downlink and uplink communication (e.g., in TDD mode).

[0063] A carrier may be associated with a specific bandwidth of the radio frequency spectrum, and in some examples, the carrier bandwidth may be referred to as the carrier or the “system bandwidth” of the wireless communication system 100. For example, the carrier bandwidth may be one of a plurality of defined bandwidths for a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz). Devices of the wireless communication system 100 (e.g., base station 105, UE 115, or both) may have a hardware configuration that supports communication on a specific carrier bandwidth, or may be configurable to support communication on one carrier bandwidth in a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 or UE 115 that supports simultaneous communication via carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured to operate on a portion (e.g., a subband, BWP) or all of the carrier bandwidth.

[0064] The signal waveform transmitted on a carrier can consist of multiple subcarriers (e.g., using multicarrier modulation (MCM) techniques such as Orthogonal Frequency Division Multiplexing (OFDM) or Discrete Fourier Transform Spread Spectrum OFDM (DFT-S-OFDM)). In a system employing MCM, a resource element can consist of one symbol period (e.g., the duration of a modulation symbol) and one subcarrier, where the symbol period and subcarrier spacing are inversely related. The number of bits carried by each resource element can depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both). Therefore, the more resource elements UE 115 receives and the higher the order of the modulation scheme, the higher the data rate can be for UE 115. Wireless communication resources can refer to a combination of radio frequency spectrum resources, temporal resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial layers can further increase the data rate or data integrity used for communication with UE 115.

[0065] One or more digital schemes can be supported for a carrier, where the digital scheme can include subcarrier spacing (Δf) and CP. A carrier can be divided into one or more BWPs with the same or different digital schemes. In some examples, UE 115 can be configured with multiple BWPs. In some examples, a single BWP for a carrier can be active at a given time, and communication for UE 115 can be restricted to one or more active BWPs.

[0066] It can be expressed in a basic unit of time (which can be, for example, T). s =1 / (Δf) max ·N f The sampling period is ) seconds, where Δf max This can represent the maximum supported subcarrier spacing, and N f The time interval for base station 105 or UE 115 can be represented as a multiple of the maximum supported Discrete Fourier Transform (DFT) size. The time interval for communication resources can be organized based on radio frames, each having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame can be identified by a System Frame Number (SFN) (e.g., ranging from 0 to 1023).

[0067] Each frame may include multiple consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, a frame may be divided (e.g., in the time domain) into subframes, and each subframe may be further divided into multiple time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the subcarrier spacing. Each time slot may include multiple symbol periods (e.g., this depends on the length of the CP added before each symbol period). In some wireless communication systems 100, time slots may be further divided into multiple micro-time slots containing one or more symbols. Excluding the CP, each symbol period may contain one or more (e.g., N) f (Number) sampling periods. The duration of a symbol period can depend on the subcarrier spacing or the operating frequency band.

[0068] A subframe, time slot, micro-time slot, or symbol can be the smallest scheduling unit of the wireless communication system 100 (e.g., in the time domain) and can be referred to as a transmission time interval (TTI). In some examples, the duration of the TTI (e.g., the number of symbol periods in the TTI) can be variable. Alternatively, the smallest scheduling unit of the wireless communication system 100 can be dynamically selected (e.g., in a burst form of a shortened TTI (sTTI)).

[0069] Physical channels can be multiplexed on a carrier using various techniques. For example, one or more of Time Division Multiplexing (TDM), Frequency Division Multiplexing (FDM), or hybrid TDM-FDM techniques can be used to multiplex physical control channels and physical data channels on a downlink carrier. A control region (e.g., a control resource set (CORESET)) for physical control channels can be defined by multiple symbol periods and can extend across the system bandwidth or a subset of the system bandwidth of the carrier. One or more control regions (e.g., CORESETs) can be configured for a group of UEs 115. For example, one or more of the UEs 115 can monitor or search for control regions against control information based on one or more search space sets, and each search space set can include one or more control channel candidates arranged in a cascaded manner at one or more aggregation levels. The aggregation level for control channel candidates can refer to the number of control channel resources (e.g., control channel elements (CCEs)) associated with coded information for a control information format having a given payload size. The search space set may include a common search space set configured to send control information to multiple UEs 115 and a UE-specific search space set used to send control information to a specific UE 115.

[0070] In some examples, base station 105 may be mobile, and therefore provide communication coverage for mobile geographic coverage areas 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but different geographic coverage areas 110 may be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. Wireless communication system 100 may include, for example, a heterogeneous network, in which different types of base stations 105 use the same or different radio access technologies to provide coverage for various geographic coverage areas 110.

[0071] Wireless communication system 100 can be configured to support ultra-reliable communication or low-latency communication, or various combinations thereof. For example, wireless communication system 100 can be configured to support ultra-reliable low-latency communication (URLLC) or mission-critical communication. UE 115 can be designed to support ultra-reliable, low-latency, or mission-critical functions (e.g., mission-critical functions). Ultra-reliable communication can include private or group communication and can be supported by one or more mission-critical services (such as mission-critical push-to-talk (MCPTT), mission-critical video (MCVideo), or mission-critical data (MCData)). Support for mission-critical functions can include service prioritization, and mission-critical services can be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, mission-critical, and ultra-reliable low-latency are used interchangeably herein.

[0072] In some examples, UE 115 can also communicate directly with other UE 115s on a device-to-device (D2D) communication link 135 (e.g., using peer-to-peer (P2P) or D2D protocols). One or more UEs 115s utilizing D2D communication can be within the geographic coverage area 110 of base station 105. Other UEs 115s in such a group can be outside the geographic coverage area 110 of base station 105, or otherwise unable to receive transmissions from base station 105. In some examples, groups of UEs 115s communicating via D2D communication can utilize a one-to-many (1:M) system, where each UE 115 transmits to each other UE 115 in the group. In some examples, base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between UEs 115 without involving base station 105.

[0073] Core network 130 can provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. Core network 130 can be an evolved packet core (EPC) or a 5G core (5GC), and can include at least one control plane entity (e.g., a mobility management entity (MME), access and mobility management function (AMF)) managing access and mobility, and at least one user plane entity (e.g., a serving gateway (S-GW), packet data network (PDN) gateway (P-GW), or user plane function (UPF)) routing packets to or interconnecting with external networks. The control plane entity can manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management for UE 115 served by base station 105 associated with core network 130. User IP packets can be transmitted through the user plane entity, which can provide IP address allocation and other functions. The user plane entity can connect to IP service 150 for one or more network operators. IP services 150 may include access to the Internet, intranets, IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0074] Some network devices (e.g., base station 105) may include sub-components such as access network entity 140, which may be an example of an access node controller (ANC). Each access network entity 140 may communicate with UE 115 through one or more other access network transport entities 145 (which may be referred to as a radio headend, smart radio headend, or transmit / receive point (TRP)). Each access network transport entity 145 may include one or more antenna panels. In some configurations, the various functions of each access network entity 140 or base station 105 may be distributed across individual network devices (e.g., radio headends and ANCs) or incorporated into a single network device (e.g., base station 105).

[0075] Wireless communication system 100 can operate using one or more frequency bands (typically in the range of 300 MHz to 300 GHz). The region from 300 MHz to 3 GHz is often referred to as the Ultra High Frequency (UHF) region or decimeter band because the wavelength range extends from approximately one decimeter to one meter in length. UHF waves may be blocked or redirected by buildings and environmental features, but the waves can be sufficiently permeable to penetrate structures for use in macrocells to provide service to UE 115 located indoors. Compared to the transmission of smaller frequencies and longer waves in the lower 300 MHz portion of the spectrum in the High Frequency (HF) or Very High Frequency (VHF) regions, UHF wave transmission can be associated with smaller antennas and shorter distances (e.g., less than 100 km).

[0076] The wireless communication system 100 can also operate in the ultra-high frequency (SHF) region using a frequency band from 3 GHz to 30 GHz (also referred to as the centimeter band) or in the extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz) (also referred to as the millimeter band). In some examples, the wireless communication system 100 can support millimeter-wave (mmW) communication between the UE 115 and the base station 105, and the EHF antennas of the corresponding device can be even smaller and more closely spaced compared to UHF antennas. In some examples, this can facilitate the use of antenna arrays within the device. However, EHF transmissions may suffer from even greater atmospheric attenuation and shorter distances compared to SHF or UHF transmissions. The techniques disclosed herein can be employed across transmissions using one or more different frequency regions, and the designated use of frequency bands across these frequency regions may vary depending on the country or regulatory authority.

[0077] Wireless communication system 100 may utilize both licensed and unlicensed radio frequency spectrum bands. For example, wireless communication system 100 may employ Licensed Assisted Access (LAA), LTE Unlicensed (LTE-U) radio access technology, or NR technology in unlicensed frequency bands (such as the 5 GHz Industrial, Scientific, and Medical (ISM) band). When operating in unlicensed radio frequency spectrum bands, devices (such as base station 105 and UE 115) may employ carrier sensing for collision detection and avoidance. In some examples, operation in unlicensed frequency bands may be based on carrier aggregation configurations that combine component carriers operating in licensed frequency bands (e.g., LAA). Operation in unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, and other examples.

[0078] Base station 105 or UE 115 may be equipped with multiple antennas, which can be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. The antennas of base station 105 or UE 115 may be located within one or more antenna arrays or antenna panels (which may support MIMO operation or transmit or receive beamforming). For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower. In some examples, the antennas or antenna arrays associated with base station 105 may be located in different geographical locations. Base station 105 may have antenna arrays with multiple rows and columns of antenna ports that base station 105 can use to support beamforming for communication with UE 115. Similarly, UE 115 may have one or more antenna arrays that can support various MIMO or beamforming operations. Alternatively or additionally, antenna panels may support radio frequency beamforming for signals transmitted via antenna ports.

[0079] Beamforming (which may also be referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that can be used at a transmitting or receiving device (e.g., base station 105, UE 115) to form or guide an antenna beam (e.g., transmit beam, receive beam) along a spatial path between the transmitting and receiving devices. Beamforming can be achieved by combining signals transmitted via antenna elements of an antenna array such that some signals propagating relative to a specific orientation of the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to the signals transmitted via the antenna elements can include applying amplitude offset, phase offset, or both to the signals carried via the antenna elements associated with the transmitting or receiving device. The adjustments associated with each antenna element can be defined by a set of beamforming weights associated with a specific orientation (e.g., relative to the antenna array of the transmitting or receiving device, or relative to some other orientation).

[0080] UE 115 and base station 105 can support data retransmission to increase the likelihood of successful data reception. Hybrid Automatic Repeat Request (HARQ) feedback is a technique used to increase the likelihood of correct data reception on communication link 125. HARQ can include a combination of error detection (e.g., using Cyclic Redundancy Check (CRC)), forward error correction (FEC), and retransmission (e.g., Automatic Repeat Request (ARQ)). HARQ can improve throughput at the MAC layer under poor radio conditions (e.g., low signal and noise conditions). In some examples, the device can support same-slot HARQ feedback, where the device can provide HARQ feedback for data received in a previous symbol within a specific time slot. In other cases, the device can provide HARQ feedback in subsequent time slots or according to some other time interval.

[0081] In some examples, the wireless communication system 100 can support communication in a relatively high frequency band (e.g., 60 GHz or above). For example, the wireless communication system 100 can support wireless devices operating in frequency range 4 (FR4) or other frequency ranges. In some cases, the wireless communication system 100 can support compatibility between operation in a relatively high frequency band (e.g., FR4 and above) and operation in a relatively low frequency band (e.g., frequency range 1 (FR1), frequency range 2 (FR2), FR2 extension (FR2x)). Compared to the frequency resources of the relatively low frequency band, the frequency resources of the relatively high frequency band can support higher spectral efficiency, larger spectrum allocation, and larger bandwidth. For example, each channel in the 60 GHz band can span a bandwidth of up to 2.16 GHz. Such bandwidth can support FFT implementation using relatively large subcarrier spacing (SCS) for OFDM waveforms.

[0082] One or more aspects of the communication can determine the threshold CP length used for the waveform. For example, a relatively large SCS in a relatively high-frequency band can correspond to a relatively short symbol duration, resulting in significant overhead associated with the CP in the symbol. Alternatively, the length of the CP can be used to cover the delay spread of the physical propagation channel, where the delay spread can depend on the deployment scenario in the wireless communication system 100. For example, an outdoor deployment scenario can correspond to a larger delay spread compared to an indoor deployment scenario. In some examples, beamforming in the mmW band can reduce the delay spread after beamforming operations. Furthermore, the length of the CP can reflect the operating signal-to-noise ratio (SNR) or other channel metrics. However, in a relatively high-frequency band, a relatively high operating SNR may be infeasible due to the relatively high phase / radio frequency (RF) noise, power constraints, or both associated with that band. Therefore, in some cases, even in the presence of a relatively large delay spread, the wireless device may avoid using a relatively large CP. Alternatively, in some cases, such as in symbols that include beam-switching operations, the wireless device can use a relatively large CP to accommodate the relatively large beam-switching delay (e.g., beam-switching gap) in a relatively high-frequency band.

[0083] In some cases, wireless devices (e.g., UE 115 and base station 105) can communicate using OFDM signals. However, configuring different CP lengths for OFDM waveforms may be limited by fixed SCS and slot duration parameters used for the OFDM waveform. Additionally, different CP lengths for OFDM waveforms may result in different numbers of symbols per slot, leading to symbol-level misalignment between OFDM waveforms. For example, UE 115 may support two CP lengths for OFDM waveforms: normal CP and extended CP. However, normal CP configurations and extended CP configurations may be misaligned at the symbol level, reducing interoperability between wireless devices using normal CP and those using extended CP. Furthermore, in use cases with varying CP lengths, supporting two CP lengths may not provide sufficient flexibility at relatively high frequency bands. Therefore, wireless communication system 100 may avoid supporting configurable CP lengths for OFDM waveforms (e.g., configurable beyond normal CP and extended CP).

[0084] To support configurable CP lengths, the wireless communication system 100 can use a single-carrier waveform with a configurable CP length. For example, the wireless communication system 100 can support single-carrier waveform communication in a relatively high-frequency band, OFDM waveform communication in a relatively high-frequency band, or both. In some cases, wireless devices (e.g., UE 115 or base station 105) can use single-carrier waveforms to improve energy efficiency (e.g., compared to using OFDM waveforms). Generating a single-carrier waveform may involve a lower peak-to-average power ratio (PAPR) compared to generating an OFDM waveform. Therefore, the same power amplifier can utilize a lower DC input driving the power amplifier to generate a single-carrier waveform (compared to the DC input used to generate the OFDM waveform). Thus, wireless devices using single-carrier communication can use the power amplifier in a more efficient mode compared to OFDM communication, effectively saving battery life at the wireless device. By using a larger portion of the available spectrum, wireless devices using single-carrier waveforms can still achieve relatively high data rates in a relatively high-frequency band.

[0085] Wireless devices using single-carrier waveforms can insert CPs into the single-carrier waveform to support frequency domain equalization and implement OFDM-like blocks or symbols. Inserting CPs into a single-carrier waveform allows the wireless device to apply FFT to the single-carrier waveform. The inserted CP can be a repeating portion of the signal, a gap insertion (GI) or unique word (UW) CP, a zero-based CP (e.g., including multiple zero samples), or any combination thereof. In contrast to OFDM waveforms, single-carrier waveforms can support flexible CP configuration. For example, a single-carrier waveform can include a dynamically configured CP length while maintaining frame alignment, slot alignment, and symbol-level alignment with other waveforms, such as OFDM waveforms. Therefore, a wireless communication system 100 implementing a configurable CP length for a single-carrier waveform can support different wireless devices communicating in the same frequency band (e.g., a relatively high frequency band) using single-carrier waveforms with configured CP lengths and using OFDM waveforms, while maintaining compatibility and scheduling flexibility based on symbol-level alignment between the single-carrier waveform and the OFDM waveform. Additionally, wireless devices can use a Public Radio Access Technology (RAT) digital scheme to allow a uniform transceiver design to transmit single-carrier waveforms and OFDM waveforms with configurable CP lengths. For example, a wireless device can use the same sampling rate, the same FFT size, or both to transmit single-carrier waveforms (e.g., with configurable CP lengths) and OFDM waveforms. Therefore, in some cases, a wireless device (e.g., UE 115) can efficiently switch between using single-carrier waveforms (e.g., with configurable CP lengths) and using OFDM waveforms while maintaining the same timing structure (e.g., based on symbol-level alignment) and the same transceiver.

[0086] Figure 2 An example of a wireless communication system 200 supporting a configurable CP length for a single-carrier waveform, according to various aspects of this disclosure, is shown. The wireless communication system 200 may include, as referred to... Figure 1 The wireless communication system 100 is described in various aspects. For example, the wireless communication system 200 may include a base station 105-a and a UE 115-a, which may be referenced. Figure 1 An example of the corresponding wireless device is described. Base station 105-a can serve a geographic coverage area 110-a. In some cases, base station 105-a and UE 115-a can communicate in a relatively high frequency band (e.g., 60 GHz or above). Base station 105-a can dynamically configure CP length 225 for UE 115-a, base station 105-a, or both for single-carrier waveforms in a relatively high frequency band.

[0087] Base station 105-a can determine the length of the CP based on one or more communication factors. For example, base station 105-a can determine the CP length 225 based on delay spread for the physical propagation channel, operating carrier-to-interference-plus-noise ratio (CINR), beam switching delay, phase noise mitigation threshold (e.g., using GI CP), or any combination thereof. The determined CP length 225 can allow the wireless device to maintain symbol-level alignment between the single-carrier waveform and other waveforms supported in the same frequency band (e.g., reference waveforms) (such as OFDM waveforms (e.g., using CP), DFT-s-OFDM waveforms, DFT-s-FDM waveforms, or any other waveforms, including other single-carrier waveforms using different CP lengths 225).

[0088] Base station 105-a can send configuration message 220 to UE 115-a on downlink channel 210. Configuration message 220 indicates a CP length 225 (e.g., a UE-specific CP length) for configuration of UE 115-a. UE 115-a can receive configuration message 220 and communicate with base station 105-a according to the configured CP length 225. For example, UE 115-a can transmit a signal including one or more CPs with the configured CP length 225, receive a signal including one or more CPs with the configured CP length 225, or both. UE 115-a can use the configured CP length 225 for single-carrier waveform communication and can avoid using the configured CP length 225 for other types of waveform communication. For example, UE 115-a can choose not to use the configured CP length 225 for OFDM waveform communication and can instead use a normal CP or extended CP configuration. That is, the UE-specific CP length configured by base station 105-a can be different from both the normal CP length and the extended CP length. For example, the configured CP length 225 can be configured based on a set of X supported CP length values, where X is greater than two.

[0089] In some cases, UE 115-a may be configured (e.g., pre-configured) with a nominal CP length for a single-carrier waveform. Alternatively, base station 105-a may be configured with a nominal CP length. The nominal CP length may be an example of a default CP length defined for a particular digital scheme. For example, UE 115-a, base station 105-a, or both may identify a default CP length associated with a particular digital scheme of the RAT. UE 115-a may update from using the nominal CP length to using a dynamically configured CP length 225 (e.g., a UE-specific CP length) based on receiving configuration message 220. For example, the UE-specific CP length configured for UE 115-a may differ from the nominal CP length associated with the digital scheme of the RAT used by UE 115-a (e.g., used by UE 115-a).

[0090] Configuration message 220 can be an example of a Layer 1 (L1) configuration message, a Layer 2 (L2) configuration message, and a Layer 3 (L3) configuration message, or any combination thereof. In a first example, configuration message 220 can be an example of a Downlink Control Information (DCI) message. A DCI message can include a field indicating the CP length 225. In some examples, this field can include a set of bits indicating the CP length value (e.g., the set of bits could indicate the number of time units spanned by the CP length 225). In some other examples, this field can include a set of bits indicating the CP length index corresponding to a lookup table. Base station 105-a and UE 115-a can store a lookup table that includes a set of CP lengths 225 and corresponding CP length indices. UE 115-a, upon receiving configuration message 220, can determine the CP length index indicated by configuration message 220 and determine the corresponding CP length value from the lookup table. In some examples, the lookup table can be pre-configured at UE 115-a. In some other examples, base station 105-a can configure UE 115-a with a CP length lookup table for single-carrier waveforms.

[0091] In the second example, configuration message 220 may be an example of a Media Access Control Element (MAC-CE). The MAC-CE may include a field indicating the CP length 225. For example, this field may include a set of bits indicating a CP length value or a CP length index corresponding to a CP length value based on a lookup table association. The size of this field can determine the number of possible CP lengths 225 supported for a single carrier waveform in the wireless communication system 200. For example, a 4-bit field can support 16 possible field values ​​corresponding to up to 16 supported CP lengths 225.

[0092] In the third example, configuration message 220 may be an example of a Radio Resource Control (RRC) message. An RRC message may include a field indicating the CP length 225. For example, this field may include a set of bits indicating the CP length value or the CP length index corresponding to the CP length value based on a lookup table association. In some examples, configuration message 220 may be sent by base station 105-a to indicate the configured CP length 225. In some other examples, configuration message 220 may be sent for another reason (e.g., granting resources for communication), but may additionally include an indication of the CP length 225. Base station 105-a may send configuration message 220 to a specific UE 115 to indicate a UE-specific CP length 225, or it may broadcast configuration message 220 to multiple UEs 115 to indicate a shared CP length 225 for a set of UEs 115.

[0093] In some examples, the CP length 225 can be bundled with a bandwidth portion (BWP) configuration. For example, base station 105-a can configure UE 115-a with a specific CP length 225 for a single-carrier waveform for a specific BWP. In some cases, the correlation between the CP length 225 and the BWP can be implicit; for example, UE 115-a can be configured with both a BWP and a CP length 225 for communication, and UE 115-a can determine that the CP length 225 is for a specific BWP based on this configuration. In other cases, the correlation between the CP length 225 and the BWP can be explicit; for example, configuration message 220 can use a BWP index to indicate one or more CP lengths 225 corresponding to one or more corresponding BWPs. Configuration message 220 can include a field indicating a BWP index and a field indicating the corresponding CP length 225, or it can include a field indicating an array of BWP indices and a field indicating an array of the same length including the corresponding CP length 225.

[0094] In some examples, base station 105-a may determine CP length 225 based on measurements of one or more signals on uplink channel 205. For example, base station 105-a may determine the delay spread (e.g., channel delay profile) associated with one or more signals received on uplink channel 205, and may determine CP length 225 based on the measured delay spread. In some cases, the delay spread associated with uplink channel 205 may correspond to the delay spread associated with downlink channel 210 (e.g., a similar delay spread). Alternatively or additionally, base station 105-a may measure one or more channel metrics (e.g., SNR, CINR), and may select CP length 225 based on one or more channel metrics.

[0095] In some cases, UE 115-a can provide feedback to base station 105-a, and base station 105-a can use the feedback to determine CP length 225. For example, UE 115-a can send feedback message 215 to base station 105-a on uplink channel 205. Feedback message 215 can be an example of a channel state information (CSI) feedback message. In some examples, feedback message 215 may include a field indicating a beam switching gap threshold for UE 115-a, a field indicating phase noise handling for UE 115-a, a field indicating delay spread for downlink channel 210, or any combination thereof. Base station 105-a can receive feedback message 215 and can configure CP length 225 for UE 115-a based on one or more fields in feedback message 215, one or more measurements at base station 105-a, or a combination thereof. In some examples, base station 105-a can initially determine the CP length 225 for UE 115-a, receive feedback message 215, and update the determined CP length 225 based on the information in feedback message 215.

[0096] UE 115-a can indicate channel delay spread to base station 105-a, or use feedback message 215 to request a specific CP length 225 from base station 105-a. In some examples, UE 115-a can measure the channel delay spread used for downlink channel 210 and can indicate the measured delay spread value in a field of feedback message 215. UE 115-a can indicate the exact measured delay spread value, or it can indicate a similar delay spread value. For example, UE 115-a can be configured (e.g., pre-configured or dynamically configured) with a quantized delay spread table. UE 115-a can identify the delay spread value closest to the measured delay spread value from the quantized delay spread table and can indicate the identified delay spread value in feedback message 215 (e.g., using an index). Base station 105-a can determine the CP length 225 based on the delay spread value indicated by feedback message 215. In some other examples, UE 115-a may be configured (e.g., pre-configured or dynamically configured) with a set of supported CP lengths 225. In some examples, UE 115-a may include a mapping function, table, algorithm, or some combination thereof to determine the CP length 225 corresponding to the measured delay spread value from the set of supported CP lengths 225. UE 115-a may measure the delay spread value for downlink channel 210, select the CP length 225 corresponding to the measured delay spread value from the set of supported CP lengths 225, and include a request for the selected CP length 225 in feedback message 215. Base station 105-a may configure UE 115-a with the requested CP length 225 (e.g., via configuration message 220) or another CP length 225.

[0097] UE 115-a may indicate a long-term delay spread value, a short-term delay spread value, or both. For example, UE 115-a may measure the delay spread for downlink channel 210 over a time period and may feed back a delay spread value based on the measurement (e.g., the average delay spread over that time period, the root mean square (RMS) of the delay spread over that time period, or another value). Alternatively, UE 115-a may measure the delay spread per time slot and may feed back the delay spread value per time slot (e.g., in a single feedback message 215 or in multiple feedback messages 215).

[0098] In some examples, UE 115-a can operate according to the configured CP length 225 received in configuration message 220 until a new configuration message 220 with a different CP length 225 is received. In some other examples, UE 115-a can operate according to the configured CP length 225 during an active period and can switch back to the nominal CP length when the active period expires. If UE 115-a receives a new configuration message 220 with a CP length 225 (e.g., during or after an active period), UE 115-a can start or restart a new active period for the CP length 225 indicated by the new configuration message 220. In some cases, the duration of the active period can be defined at UE 115-a. In some other cases, configuration message 220 can indicate the duration of the active period for the CP length 225 (e.g., in a bit field).

[0099] Therefore, UE 115-a can receive the configured CP length 225 from base station 105-a and use the configured CP length 225 for single-carrier waveform communication. In some cases, UE 115-a can use the configured CP length 225 in a specific symbol (e.g., to mitigate beam switching delay). In some other cases, UE 115-a can use the configured CP length 225 in every symbol (e.g., to mitigate delay spread for the channel). UE 115-a can use the configured CP length 225 to generate a single-carrier waveform for transmission, receive a single-carrier waveform from base station 105-a, or both. In some cases, by using the configurable CP length 225 for single-carrier waveforms, wireless communication system 200 can allow the CP length 225 to be configured to any value (e.g., not just a small set of configuration values). In some other cases, wireless communication system 200 can support a relatively large set of CP lengths 225, which can be dynamically configured by the wireless network or defined at the wireless network (e.g., in a lookup table). This configurability of the CP length 225 for a single-carrier waveform can provide the wireless communication system 200 with flexibility in handling a variety of different channel conditions, especially in relatively high frequency bands (e.g., FR4 and above).

[0100] Figure 3 An example is shown of a CP insert 300 with a configurable CP length for single-carrier waveforms to handle beam switching symbols, according to various aspects of this disclosure. The CP insert 300 may include, as referred to... Figure 1 and 2The wireless communication system 100 or 200 is described in various aspects. For example, a wireless device (such as UE 115 or base station 105) can perform CP insertion 300 based on a configured CP length. CP insertion 300 can allow the wireless device to efficiently utilize available resources when performing beam switching procedures.

[0101] Wireless devices operating using beamforming communication (e.g., UE 115, base station 105) can perform beam-switching procedures to select the beam for communication. For example, if the wireless device is mobile or communicating with a mobile device, the beam-switching procedure can allow the device to maintain connectivity as the relative position of the devices changes. The beam-switching procedure can involve sending or receiving messages in multiple different beam directions, updating precoding procedures, or both, which can involve a time amount referred to as beam-switching delay 320. During beam-switching delay 320, the wireless device may fail to send or receive control or data information. In some other systems, if the beam-switching delay is greater than the CP length (e.g., default CP length, normal CP length, extended CP length), the wireless device may fail to utilize the symbol in which the beam-switching procedure occurs (e.g., outside the CP).

[0102] Conversely, despite the beam-switching delay 320, the wireless communication system can also use CP insertion 300 to efficiently utilize each symbol. For example, the wireless device can be configured with a CP length at least as long as the beam-switching delay. The wireless device can insert CPs with the configured CP length (e.g., zero-based CPs) into the beam-switching symbols to utilize the remainder of the beam-switching symbols. Specifically, for a switching symbol, the wireless device can pad with zeros around the useful signal (e.g., control or data signaling) and perform the same FFT operation. The number of zero samples used for the beam-switching symbol can depend on the beam-switching delay 320, while the non-zero samples in the beam-switching symbol can carry useful control or data information. In some examples, the configured CP length used to handle beam-switching can be greater than the nominal CP length used in other symbols.

[0103] For example, UE 115 may initially communicate with base station 105 using a first communication beam in first symbol 325-a. UE 115 may insert CP 305-a having a nominal CP length (or the CP length for a first configuration of a non-beam-switching symbol) and transmit control or data information 310-a in first symbol 325-a. In symbol 325-b, UE 115 may perform a beam-switching procedure to switch to operating using a second communication beam. In some cases, UE 115 may communicate using the first communication beam in beam-switching symbol 325-b before performing a beam-switching procedure. In some other cases, UE 115 may perform a beam-switching procedure and then communicate using the second communication beam in beam-switching symbol 325-b. As shown in the figure, UE 115 can insert a zero-based CP 315-a (e.g., with a nominal CP length or a first configured CP length), transmit control or data information 310-b, and insert a zero-based CP 315-b with a configured CP length (e.g., a second configured CP length for beam switching symbols). UE 115 can perform a beam switching procedure during the zero-based CP 315-b, causing a beam switching delay 320 when no control or data information is being transmitted. Therefore, UE 115 can effectively utilize beam switching symbols 325-b.

[0104] Following the beam switching process, UE 115 can use the second communication beam to communicate in subsequent symbols 325. For example, UE 115 can insert CP 305-b with a nominal CP length (or the CP length for a first configuration of a non-beam-switching symbol) and transmit control or data information 310-c in symbol 325-c, and can also insert CP 305-c with a nominal CP length (or the CP length for a first configuration of a non-beam-switching symbol) and transmit control or data information 310-d in symbol 325-d of time slot 330.

[0105] Figure 4 An example is shown of a CP insert 400 supporting a configurable CP length for a single-carrier waveform to handle channel delay spread, according to various aspects of this disclosure. The CP insert 400 may include, as referred to... Figure 1 and 2 The wireless communication system 100 or 200 is described in various aspects. For example, a wireless device (such as UE 115 or base station 105) can perform CP insertion 400 using a configured CP length. CP insertion 400 can allow the wireless device to mitigate the negative impact of physical propagation channel delay spread, thereby improving communication reliability.

[0106] In some examples, the wireless device can insert a CP (Cost Per Component) into the signal to mitigate inter-symbol interference caused by delay spread 410 between paths 405 in multipath reception. For example, the wireless device can receive multiple copies of the same signal transmitted in symbol 435-a on multiple paths 405. For example, as shown, the device can receive useful samples 450 for symbol 435-a on a first path 405-a, a second path 405-b, and a third path 405-c. The first path 405-a can be an example of the earliest path, while the third path 405-c can be an example of the latest path. The time difference between the latest and earliest paths can be the delay spread 410 for the channel. To successfully receive the signal, the transceiver can perform an FFT operation on the signals received on different arrival paths 405. For example, the transceiver can add the signals together and can scale one or more signals in the signal based on the impulse response sampled at the reception time for different paths 405. In order to successfully perform an FFT operation, the transceiver may apply an FFT window with an FFT window size of 440 to capture useful samples 450 of the waveform on path 405, without capturing useful samples 450 of the waveform for different symbols 435 (e.g., previous symbol 435 or subsequent symbol 435 (such as symbol 435-b)).

[0107] If the delay extension is 410, which is greater than the nominal CP length N cp If the length is 415, then use the nominal CP length N. cp 415 may cause the FFT window to capture useful samples 450 of the waveform for different symbols 435, potentially leading to errors in the FFT operation. For example, useful samples 450 of the waveform for different symbols 435 may corrupt the cyclic characteristics of the waveform. However, changing the FFT window size 440 to accommodate the delay extension 410 may not be supported by the transceiver, or may involve significant complexity, processing resources, or both.

[0108] Conversely, the wireless device can be configured with a CP length greater than the nominal CP length to support delay extension 410. Additionally, the wireless device can use a zero-based CP to avoid capturing useful samples 450 of waveforms for different symbols 435 using the same FFT window size 440. For example, the configured CP length can span the nominal CP length N. cp 415 plus an additional CP length Δ420. That is, the configured CP length can be equal to N. cp +Δ430. As shown in the figure, an FFT window size of 440 can span a length N. fft Each symbol 435 includes a total of N fft +N cpThe FFT window size of 440 can be used for multiple configurations of CP length. For example, for any value of Δ420, if the extra samples included in Δ420 are replaced with zeros (e.g., to form a circular convolution), then the FFT window size of 440 can support a range from the nominal CP length N. cp 415 to the configured CP length N cp Any CP length of +Δ430. That is, the wireless device can use a nominal FFT window size of 440 for frequency domain equalization by using zero as the CP. The wireless device can also use a CP insert 400 with a configured CP length to maintain symbol-level alignment with OFDM signals based on normal CP or OFDM signals based on extended CP.

[0109] By using a configured CP length N cp With a zero-based CP of +Δ430, the wireless device can include additional overhead N in the first symbol 435-a (e.g., symbol 0 in the time slot, the first symbol of communication). cp +Δ, and additional overhead N can be included in subsequent notations 435 (such as notation 435-b). cp However, wireless devices can mitigate the negative impact of delay spread 410 on the physical propagation channel. For example, Figure 4 This illustrates that the receiver uses a longer zero-based CP (e.g., longer than the nominal CP length N). cp 415) is processed to handle an example of symbol 0 (e.g., symbol 435-a) of delay extension 410. If the wireless device is configured with a CP length at least as long as delay extension 410 (e.g., total delay extension < N), cp +Δ), then the wireless device can use the same FFT window size 440 without capturing waveforms from different symbols 435 within the FFT window. For example, the application is N fft The FFT window size 440 may capture at least a portion of the previous symbol or subsequent symbol 435-b. However, if the samples captured from other symbols 435 are zero samples, the FFT operation may be unaffected, and the wireless device can successfully perform the FFT operation regardless. As shown, the FFT window can be positioned such that it captures useful samples 450 for symbols 435-a in each path of path 405, a portion of the zero-based CP 445 for path 405, and samples from different symbols 455. However, based on this configuration, samples from different symbols 455 correspond to the zero-based CP 445 for the previous symbol and therefore do not negatively affect the FFT operation. Thus, the wireless device can implement a configurable CP length to handle channel delay spread 410 greater than the nominal CP length, thereby improving the reception reliability for the wireless device.

[0110] In some examples, one or more wireless devices can maintain phase continuity before and after utilizing zero-padded waveforms (e.g., zero-based CP445). Maintaining phase continuity allows wireless devices to avoid performing additional channel estimation after each zero-padded operation. Maintaining phase continuity may involve additional complexity at the transmitter. In some cases, some wireless devices (e.g., base station 105) can maintain phase continuity, while other wireless devices (e.g., UE 115) may not. In some such cases, a length greater than the nominal CP length (e.g., N) is used. cp 415) Long configuration CP length (e.g., N) cp The CP insertion 400, which handles the channel delay spread 410 (+Δ430), can be used for downlink signaling, where the base station 105 transmitting the signal can maintain phase continuity.

[0111] In some cases, wireless devices can apply a configured CP length shorter than the nominal CP length (e.g., to handle relatively short latency spread). For example, a wireless device can be configured with a CP length N. cp -Δ. In some examples, to handle such a configuration, the wireless device can use the Discrete Fourier Transform (DFT) for frequency domain equalization (e.g., the opposite of using the FFT). Using DFT operations with DFT window sizes of quality factors 2, 3, and / or 5 can support efficient processing (e.g., similar to the efficient processing provided by an FFT with a factor of 2). Therefore, specific CP length values ​​can be configured to support efficient DFT processing. Table 1 shows some example FFT sizes with corresponding nominal CP lengths, as well as supported short CP lengths (e.g., shorter than the nominal CP length) and their corresponding DFT sizes and factors.

[0112]

[0113] Table 1: Example Short CP Length and Corresponding DFT Size

[0114] In some other examples, the wireless device may avoid performing frequency-domain equalization. Instead, the wireless device may perform time-domain equalization on waveforms with short CP lengths (e.g., shorter than the nominal CP length). For example, a relatively short CP length may indicate a relatively short delay spread, a relatively low CINR, or both, making time-domain equalization efficient and involving relatively low complexity. In some cases, the wireless device may apply a nominal FFT to one or more reference signals (e.g., a demodulation reference signal (DMRS)) to obtain frequency-domain equalizer coefficients and may convert back to a time-domain equalizer to receive the signal. Thus, the wireless device may support the use of a nominal CP length, a dynamically configured CP length shorter than the nominal CP length, a dynamically configured CP length longer than the nominal CP length, or any combination thereof.

[0115] Figure 5 An example of a process flow 500 supporting a configurable CP length for a single-carrier waveform, according to various aspects of this disclosure, is shown. Process flow 500 can be derived from references... Figure 1 and 2 The described wireless communication system 100 or wireless communication system 200 is used for implementation. Process flow 500 may include UE 115-b and base station 105-b, which may be referenced... Figures 1 to 4 Examples of corresponding devices described. Base station 105-b can configure UE 115-b with a CP length for single-carrier waveform communication. Alternative examples below can be implemented, some of which may be performed in a different order than described or not at all. In some cases, the procedures may include additional features not mentioned below, or additional procedures may be added.

[0116] In some cases, at 505, UE 115-b can send a feedback message to base station 105-b to indicate the CP length. For example, UE 115-b can measure the channel delay spread between base station 105-b and UE 115-b. In some examples, UE 115-b can indicate the measured channel delay spread in the feedback message. In some other examples, UE 115-b can determine the channel delay spread index from a lookup table based on the measured channel delay spread and can indicate the channel delay spread index in the feedback message. In still other examples, UE 115-b can request a specific CP length in the feedback message. The feedback message can be an example of a CSI feedback message.

[0117] At 510, base station 105-b can determine the CP length (e.g., a UE-specific CP length for UE 115-b). In some examples, base station 105-b can perform one or more channel measurements for one or more uplink signals and can determine the CP length based on one or more channel measurements. Alternatively, base station 105-b can receive a feedback message at 505 and can determine the CP length based on the feedback message. The CP length can be determined based on channel delay spread, operational CINR, beam switching gap threshold (e.g., beam switching delay), phase noise mitigation threshold, or a combination thereof.

[0118] At point 515, base station 105-b may send a configuration message to UE 115-b indicating (e.g., determined at point 510) the CP length. The CP length may be an example of a UE-specific CP length configured for UE 115-b. In some examples, the configuration message may include an index value corresponding to a CP length in a set of configured CP lengths (e.g., based on an association in a lookup table). In some other examples, the configuration message may include an absolute length value of the CP length. In some cases, the indicated CP length may correspond to a specific BWP. For example, the configuration message may indicate a BWP configuration that includes at least one or more associations between one or more BWPs and one or more CP lengths. The configuration message may be an example of a DCI message, MAC-CE, RRC message, or a combination thereof.

[0119] UE 115b can receive configuration messages and can use a configured CP length (e.g., a UE-specific CP length). For example, UE 115-b can use a nominal CP length (e.g., based on a RAT digital scheme). Upon receiving a configuration message, UE 115-b can switch to using the configured CP length and can avoid using the nominal CP length. The configured CP length can be longer or shorter than the nominal CP length.

[0120] At 520, UE 115-b can communicate with base station 105-b using a configured CP length. For example, UE 115-b can communicate with base station 105-b by transmitting or receiving signals in one or more symbols using a single carrier waveform and a CP with a configured CP length. In some examples, the CP may include a set of zero samples. One or more symbols on which signals are transmitted can be aligned in the time domain with one or more corresponding symbols for another waveform (such as a reference OFDM waveform) supported in the same frequency range. That is, the symbol timing for a single-carrier waveform with a configurable length CP can be aligned in the time domain with the OFDM reference symbol timing. Therefore, UE 115-b and base station 105-b can switch between communicating using a single-carrier waveform and communicating using an OFDM waveform while efficiently maintaining symbol-level alignment.

[0121] In some examples, communication may involve: UE 115-b or base station 105-b inserting a CP into each of one or more symbols based on channel delay spread, and transmitting a signal with the inserted CP. In some other examples, communication may involve: UE 115-b or base station 105-b determining the symbol corresponding to a beam-switching operation, inserting a CP into the determined symbol based on a beam-switching delay for the beam-switching operation, and transmitting a signal with the inserted CP. Alternatively or additionally, communication may involve: UE 115-b or base station 105-b receiving a signal and performing an FFT on the signal using an FFT size that is the same for both the configured CP length and the nominal CP length. The FFT size may also be the same as the FFT size used for OFDM waveforms. In some other cases, communication may involve: UE 115-b or base station 105-b receiving a signal and performing a DFT on the signal using a DFT size based on a configured CP length that is smaller than the nominal CP length.

[0122] In some cases, the configuration message may indicate an active period for the indicated CP length, and UE 115-b, base station 105-b, or both may communicate using the indicated CP length during the active period. If UE 115-b, base station 105-b, or both determine the expiration of the active period, UE 115-b, base station 105-b, or both may communicate using a nominal CP length (e.g., associated with the RAT digital scheme used for UE 115-b) based on the expiration of the active period.

[0123] Figure 6 A block diagram 600 of a device 605 supporting a configurable CP length for a single-carrier waveform is shown according to various aspects of this disclosure. Device 605 may be an example of various aspects of a UE 115 as described herein. Device 605 may include a receiver 610, a transmitter 615, and a communications manager 620. Device 605 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0124] Receiver 610 may provide a unit for receiving information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels associated with a configurable CP length for a single-carrier waveform). The information may be passed to other components of device 605. Receiver 610 may utilize a single antenna or a collection of antennas.

[0125] Transmitter 615 may provide a unit for transmitting signals generated by other components of device 605. For example, transmitter 615 may transmit information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels associated with a configurable CP length for a single-carrier waveform). In some examples, transmitter 615 may be co-located with receiver 610 in a transceiver module. Transmitter 615 may utilize a single antenna or a collection of multiple antennas.

[0126] The communication manager 620, receiver 610, transmitter 615, or various combinations thereof, or various components thereof, may be examples of units for performing various aspects of the configurable CP length for a single-carrier waveform as described herein. For example, the communication manager 620, receiver 610, transmitter 615, or various combinations thereof, or components thereof, may support methods for performing one or more of the functions described herein.

[0127] In some examples, the communication manager 620, receiver 610, transmitter 615, or various combinations or components thereof may be implemented in hardware (e.g., in communication management circuitry). The hardware may include a processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof configured to or otherwise support units for performing the functions described herein. In some examples, the processor and memory coupled to the processor may be configured to perform one or more of the functions described herein (e.g., by executing instructions stored in memory by the processor).

[0128] Alternatively or concurrently, in some examples, the communication manager 620, receiver 610, transmitter 615, or various combinations or components thereof may be implemented using code executed by a processor (e.g., as communication management software or firmware). If implemented using processor-executed code, the functionality of the communication manager 620, receiver 610, transmitter 615, or various combinations or components thereof may be performed by a general-purpose processor, DSP, central processing unit (CPU), ASIC, FPGA, or any combination of these or other programmable logic devices (e.g., a unit configured or otherwise supported for performing the functions described in this disclosure).

[0129] In some examples, the communication manager 620 may be configured to use or otherwise cooperate with the receiver 610, transmitter 615, or both to perform various operations (e.g., receiving, monitoring, transmitting). For example, the communication manager 620 may receive information from the receiver 610, send information to the transmitter 615, or integrate with the receiver 610, transmitter 615, or both to receive information, send information, or perform various other operations as described herein.

[0130] According to the examples disclosed herein, the communication manager 620 can support wireless communication at the UE. For example, the communication manager 620 can be configured or otherwise supported to support elements for receiving configuration messages indicating a UE-specific CP length for communicating with a base station. The communication manager 620 can be configured or otherwise supported to support elements for communicating with a base station using a single-carrier waveform and a CP based on a UE-specific CP length, wherein the communication involves transmitting or receiving signals in one or more symbols, said one or more symbols being aligned in the time domain with one or more corresponding symbols of a reference OFDM waveform.

[0131] By including or configuring the communication manager 620 according to the examples described herein, device 605 (e.g., a processor that controls or otherwise couples to receiver 610, transmitter 615, communication manager 620, or combinations thereof) can support techniques for improving communication reliability. For example, by dynamically configuring the CP length, communication manager 620 can mitigate the negative effects of beam-switching delay, channel propagation delay spread, poor CINR (e.g., below the CINR threshold), or any combination thereof. Therefore, communication manager 620 can improve communication reliability for beam-switched symbols, symbols with significant (e.g., above the threshold) channel delay spread, or both. Improved communication reliability can reduce the number of retransmissions used by the wireless device to transmit information, thereby effectively reducing the number of times the processor ramps up processing power and opens processing units to handle communications. Furthermore, reducing the number of retransmissions can reduce channel overhead.

[0132] Figure 7 A block diagram 700 of a device 705 supporting a configurable CP length for a single-carrier waveform is shown according to various aspects of this disclosure. Device 705 may be an example of aspects of device 605 or UE 115 as described herein. Device 705 may include a receiver 710, a transmitter 715, and a communication manager 720. Device 705 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0133] Receiver 710 may provide a unit for receiving information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels associated with configurable CP lengths for single-carrier waveforms). Information may be passed to other components of device 705. Receiver 710 may utilize a single antenna or a collection of antennas.

[0134] Transmitter 715 may provide a unit for transmitting signals generated by other components of device 705. For example, transmitter 715 may transmit information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels associated with configurable CP lengths for single-carrier waveforms). In some examples, transmitter 715 may be co-located with receiver 710 in a transceiver module. Transmitter 715 may utilize a single antenna or a collection of multiple antennas.

[0135] Device 705 or its various components may be examples of units for performing various aspects of configurable CP lengths for single-carrier waveforms as described herein. For example, communication manager 720 may include CP length configuration component 725, communication component 730, or any combination thereof. Communication manager 720 may be examples of various aspects of communication manager 620 as described herein. In some examples, communication manager 720 or its various components may be configured to use receiver 710, transmitter 715, or both, or otherwise cooperate with receiver 710, transmitter 715, or both to perform various operations (e.g., receiving, monitoring, transmitting). For example, communication manager 720 may receive information from receiver 710, send information to transmitter 715, or be integrated in combination with receiver 710, transmitter 715, or both to receive information, send information, or perform various other operations as described herein.

[0136] According to the examples disclosed herein, the communication manager 720 can support wireless communication at the UE. The CP length configuration component 725 can be configured or otherwise supported to include elements for receiving configuration messages from a base station, the configuration messages indicating a UE-specific CP length for communicating with the base station. The communication component 730 can be configured or otherwise supported to include elements for communicating with the base station by transmitting or receiving signals in one or more symbols using a single-carrier waveform and a CP based on a UE-specific CP length, wherein the one or more symbols are aligned in the time domain with one or more corresponding symbols of a reference OFDM waveform.

[0137] Figure 8A block diagram 800 is shown of a communication manager 820 supporting configurable CP lengths for single-carrier waveforms according to various aspects of this disclosure. The communication manager 820 may be an example of aspects of the communication manager 620, communication manager 720, or both as described herein. The communication manager 820 or its various components may be examples of units for performing the various aspects of configurable CP lengths for single-carrier waveforms as described herein. For example, the communication manager 820 may include a CP length configuration component 825, a communication component 830, a CP insertion component 835, a beam switching identification component 840, a nominal CP length component 845, a feedback component 850, a BWP component 855, an FFT component 860, a DFT component 865, a delay extension component 870, a CP length request component 875, or any combination thereof. Each of these components may communicate directly or indirectly with each other (e.g., via one or more buses).

[0138] According to the examples disclosed herein, the communication manager 820 can support wireless communication at the UE. The CP length configuration component 825 can be configured or otherwise supported for receiving configuration messages indicating a UE-specific CP length for communicating with the base station. The communication component 830 can be configured or otherwise supported for communicating with the base station using a single-carrier waveform and a CP based on a UE-specific CP length, wherein the communication includes transmitting or receiving signals in one or more symbols aligned in the time domain with one or more corresponding symbols of a reference OFDM waveform.

[0139] In some examples, to support communication, the CP insertion component 835 may be configured or otherwise supported to include units for inserting a CP into each of one or more symbols based on channel delay spread. In some examples, to support communication, the communication component 830 may be configured or otherwise supported to include units for transmitting signals after CP insertion.

[0140] In some examples, to support communication, the beam switching identification component 840 may be configured or otherwise supported to include elements for determining the symbol corresponding to the beam switching operation. In some examples, to support communication, the CP insertion component 835 may be configured or otherwise supported to include elements for inserting a CP into the determined symbol based on the beam switching delay used for the beam switching operation. In some examples, to support communication, the communication component 830 may be configured or otherwise supported to include elements for transmitting a signal after CP insertion. In some examples, the beam switching identification component 840 may be configured or otherwise supported to include elements for determining a CP length with a beam switching delay greater than the nominal CP length associated with the digital scheme of the RAT for the UE, wherein the symbol corresponding to the beam switching operation is determined based on the beam switching delay being greater than the nominal CP length, and the CP is inserted based on the beam switching delay being greater than the nominal CP length.

[0141] In some examples, the nominal CP length component 845 may be configured or otherwise support elements for determining the nominal CP length using a RAT-based digital scheme. In some examples, the nominal CP length component 845 may be configured or otherwise support elements for avoiding the use of the nominal CP length for CP based on receiving a configuration message indicating a UE-specific CP length.

[0142] In some examples, to support communication, the communication component 830 may be configured or otherwise supported as a unit for receiving signals. In some examples, to support communication, the FFT component 860 may be configured or otherwise supported as a unit for performing an FFT on a signal using an FFT size that is the same for both the UE-specific CP length and the nominal CP length.

[0143] In some examples, the CP includes a set of multiple zero samples. In some examples, the UE-specific CP length is greater than the nominal CP length associated with the digital scheme of the RAT used for the UE.

[0144] In some examples, the UE-specific CP length is less than the nominal CP length associated with the digital scheme of the RAT used for the UE, and the UE-specific CP length is based on the DFT size. In some examples, to support communication, the communication component 830 may be configured or otherwise support a unit for receiving signals. In some examples, to support communication, the DFT component 865 may be configured or otherwise support a unit for performing a DFT on signals using the DFT size and based on the UE-specific CP length.

[0145] In some examples, the feedback component 850 may be configured or otherwise supported as a unit for sending feedback messages to the base station, wherein the UE-specific CP length is based on the feedback message.

[0146] In some examples, the delay extension component 870 may be configured or otherwise support a unit for measuring the channel delay extension between the base station and the UE, wherein a feedback message indicates the measured channel delay extension, and the UE-specific CP length is based on the measured channel delay extension.

[0147] In some examples, the delay extension component 870 may be configured or otherwise supported to enable the determination of a channel delay extension index from a lookup table based on the measured channel delay extension, wherein the feedback message includes the channel delay extension index.

[0148] In some examples, the UE-specific CP length includes a first CP length, and the CP length request component 875 can be configured or otherwise supported to include a unit for determining a second CP length from a configured set of CP lengths, wherein the feedback message includes a request for the second CP length, and the first CP length is based on the second CP length.

[0149] In some examples, the feedback message includes a CSI feedback message.

[0150] In some examples, the configuration message also indicates a BWP configuration that includes at least one or more associations between one or more BWPs and one or more CP lengths, and the BWP component 855 may be configured or otherwise support elements for determining the BWPs used for communication among the one or more BWPs. In some examples, the configuration message also indicates a BWP configuration that includes at least one or more associations between one or more BWPs and one or more CP lengths, and the BWP component 855 may be configured or otherwise support elements for determining the UE-specific CP length based on the associations between the determined BWPs and the UE-specific CP lengths in one or more associations.

[0151] In some examples, the configuration message indicates an activity period for a UE-specific CP length, and the communication component 830 can be configured or otherwise support units for communication using a UE-specific CP length during the activity period.

[0152] In some examples, communication component 830 may be configured or otherwise supported as a unit for determining the expiration of an active period. In some examples, communication component 830 may be configured or otherwise supported as a unit for communicating using a nominal CP length associated with the digital scheme of the RAT for the UE based on the expiration of the active period.

[0153] In some examples, the configuration message includes an index value corresponding to a UE-specific CP length in the configured set of CP lengths. In other examples, the configuration message includes the absolute length value of the UE-specific CP length.

[0154] In some examples, the UE-specific CP length is based on channel delay spread, operational CINR, beam switching gap threshold, phase noise reduction threshold, or a combination thereof.

[0155] In some examples, configuration messages include DCI messages, MAC-CE, RRC messages, or combinations thereof.

[0156] Figure 9 A diagram of a system 900 including a device 905 supporting a configurable CP length for a single-carrier waveform is shown according to various aspects of this disclosure. Device 905 may be an example of device 605, device 705, or UE 115 as described herein, or may include components thereof. Device 905 may wirelessly communicate with one or more base stations 105, UE 115, or any combination thereof. Device 905 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, such as a communication manager 920, an input / output (I / O) controller 910, a transceiver 915, an antenna 925, a memory 930, a code 935, and a processor 940. These components may communicate electronically via one or more buses (e.g., bus 945) or be coupled in other ways (e.g., operational ground, communication ground, functional ground, electronic ground, electrical ground).

[0157] I / O controller 910 can manage input and output signals for device 905. I / O controller 910 can also manage peripheral devices not integrated into device 905. In some cases, I / O controller 910 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 910 can utilize, for example... This can be an operating system such as I / O controller 910 or another known operating system. Alternatively, I / O controller 910 may represent or interact with a modem, keyboard, mouse, touchscreen, or similar device. In some cases, I / O controller 910 may be implemented as part of a processor (such as processor 940). In some cases, a user may interact with device 905 via I / O controller 910 or via hardware components controlled by I / O controller 910.

[0158] In some cases, device 905 may include a single antenna 925. However, in other cases, device 905 may have more than one antenna 925, which are capable of transmitting or receiving multiple wireless transmissions simultaneously. Transceiver 915 may communicate bidirectionally via one or more antennas 925, wired or wireless links as described herein. For example, transceiver 915 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. Transceiver 915 may also include a modem for modulating packets, providing modulated packets to one or more antennas 925 for transmission, and demodulating packets received from one or more antennas 925. Transceiver 915, or transceiver 915 and one or more antennas 925, may be an example of transmitter 615, transmitter 715, receiver 610, receiver 710, or any combination thereof or components thereof as described herein.

[0159] Memory 930 may include random access memory (RAM) and read-only memory (ROM). Memory 930 may store computer-readable, computer-executable code 935, which includes instructions that, when executed by processor 940, cause device 905 to perform the various functions described herein. Code 935 may be stored in a non-transitory computer-readable medium, such as system memory or another type of memory. In some cases, code 935 may not be directly executable by processor 940, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein. In some cases, in addition, memory 930 may also include a basic I / O system (BIOS) that controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0160] Processor 940 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, CPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, processor 940 may be configured to use a memory controller to operate a memory array. In other cases, the memory controller may be integrated into processor 940. Processor 940 may be configured to execute computer-readable instructions stored in memory (e.g., memory 930) to cause device 905 to perform various functions (e.g., functions or tasks supporting configurable CP lengths for single-carrier waveforms). For example, device 905 or components of device 905 may include processor 940 and memory 930 coupled to processor 940, processor 940 and memory 930 being configured to perform the various functions described herein.

[0161] According to the examples disclosed herein, the communication manager 920 can support wireless communication at the UE. For example, the communication manager 920 can be configured or otherwise supported to support elements for receiving configuration messages indicating a UE-specific CP length for communicating with a base station. The communication manager 920 can be configured or otherwise supported to support elements for communicating with a base station using a single-carrier waveform and a CP based on a UE-specific CP length, wherein the communication includes transmitting or receiving signals in one or more symbols, said one or more symbols being aligned in the time domain with one or more corresponding symbols of a reference OFDM waveform.

[0162] By including or configuring the communication manager 920 according to the examples described herein, device 905 can support techniques for improving communication reliability and more effectively utilizing available communication resources. For example, device 905 can use a configured CP length to account for beam switching delay, thereby supporting the efficient use of beam switching symbols for control and / or data communication. Alternatively, device 905 can use a configured CP length to mitigate the negative impact of channel delay spread, thereby improving FFT operation and correspondingly increasing communication reliability.

[0163] In some examples, the communication manager 920 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or in cooperation with transceiver 915, one or more antennas 925, or any combination thereof. Although the communication manager 920 is shown as a separate component, in some examples, one or more functions described with reference to the communication manager 920 may be supported or performed by processor 940, memory 930, code 935, or any combination thereof. For example, code 935 may include instructions executable by processor 940 to cause device 905 to perform various aspects of the configurable CP length for a single-carrier waveform as described herein, or processor 940 and memory 930 may be otherwise configured to perform or support such operations.

[0164] Figure 10 A block diagram 1000 of a device 1005 supporting a configurable CP length for a single-carrier waveform is shown according to various aspects of this disclosure. Device 1005 may be an example of various aspects of a base station 105 as described herein. Device 1005 may include a receiver 1010, a transmitter 1015, and a communication manager 1020. Device 1005 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0165] Receiver 1010 may provide a unit for receiving information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels associated with configurable CP lengths for single-carrier waveforms). Information may be passed to other components of device 1005. Receiver 1010 may utilize a single antenna or a collection of antennas.

[0166] Transmitter 1015 may provide a unit for transmitting signals generated by other components of device 1005. For example, transmitter 1015 may transmit information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels associated with configurable CP lengths for single-carrier waveforms). In some examples, transmitter 1015 may be co-located with receiver 1010 in a transceiver module. Transmitter 1015 may utilize a single antenna or a collection of multiple antennas.

[0167] The communication manager 1020, receiver 1010, transmitter 1015, or various combinations thereof, or various components thereof, may be examples of units for performing various aspects of the configurable CP length for a single-carrier waveform as described herein. For example, the communication manager 1020, receiver 1010, transmitter 1015, or various combinations thereof, or components thereof, may support methods for performing one or more of the functions described herein.

[0168] In some examples, the communication manager 1020, receiver 1010, transmitter 1015, or various combinations or components thereof may be implemented in hardware (e.g., in communication management circuitry). The hardware may include processors, DSPs, ASICs, FPGAs, or other programmable logic devices, discrete gate or transistor logic, discrete hardware components, or any combination thereof, configured to or otherwise support units for performing the functions described herein. In some examples, the processor and memory coupled to the processor may be configured to perform one or more of the functions described herein (e.g., by executing instructions stored in memory by the processor).

[0169] Alternatively or concurrently, in some examples, the communication manager 1020, receiver 1010, transmitter 1015, or various combinations or components thereof may be implemented using code executed by a processor (e.g., as communication management software or firmware). If implemented using code executed by a processor, the functionality of the communication manager 1020, receiver 1010, transmitter 1015, or various combinations or components thereof may be performed by a general-purpose processor, DSP, CPU, ASIC, FPGA, or any combination of these or other programmable logic devices (e.g., a unit configured or otherwise supported for performing the functions described in this disclosure).

[0170] In some examples, the communication manager 1020 may be configured to use or otherwise cooperate with the receiver 1010, transmitter 1015, or both to perform various operations (e.g., receiving, monitoring, transmitting). For example, the communication manager 1020 may receive information from the receiver 1010, send information to the transmitter 1015, or integrate with the receiver 1010, transmitter 1015, or both to receive information, send information, or perform various other operations as described herein.

[0171] According to the examples disclosed herein, the communication manager 1020 can support wireless communication at a base station. For example, the communication manager 1020 can be configured or otherwise supported to support elements for sending a configuration message to a UE, the configuration message including a UE-specific CP length. The communication manager 1020 can be configured or otherwise supported to support elements for communicating with a UE using a single-carrier waveform and a CP based on a UE-specific CP length, wherein the communication involves transmitting or receiving signals in one or more symbols, the one or more symbols being aligned in the time domain with one or more corresponding symbols of a reference OFDM waveform.

[0172] By including or configuring the communication manager 1020 according to the examples described herein, device 1005 (e.g., a processor that controls or is otherwise coupled to receiver 1010, transmitter 1015, communication manager 1020, or a combination thereof) can support techniques for coordinating different wireless devices using different waveform types in the same frequency band. For example, wireless devices can use single-carrier waveforms, OFDM waveforms, or both with configurable CP lengths in the frequency band while maintaining symbol-level alignment to improve scheduling and interference mitigation.

[0173] Figure 11 A block diagram 1100 of a device 1105 supporting a configurable CP length for a single-carrier waveform is shown according to various aspects of this disclosure. Device 1105 may be an example of aspects of device 905 or base station 105 as described herein. Device 1105 may include a receiver 1110, a transmitter 1115, and a communication manager 1120. Device 1105 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0174] Receiver 1110 may provide a unit for receiving information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels associated with a configurable CP length for a single-carrier waveform). Information may be passed to other components of device 1105. Receiver 1110 may utilize a single antenna or a collection of antennas.

[0175] Transmitter 1115 may provide a unit for transmitting signals generated by other components of device 1105. For example, transmitter 1115 may transmit information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels associated with configurable CP lengths for single-carrier waveforms). In some examples, transmitter 1115 may be co-located with receiver 1110 in a transceiver module. Transmitter 1115 may utilize a single antenna or a collection of multiple antennas.

[0176] Device 1105 or its various components may be examples of units for performing various aspects of configurable CP lengths for single-carrier waveforms as described herein. For example, communication manager 1120 may include CP length indication component 1125, communication component 1130, or any combination thereof. Communication manager 1120 may be examples of various aspects of communication manager 1020 as described herein. In some examples, communication manager 1120 or its various components may be configured to use receiver 1110, transmitter 1115, or both, or otherwise cooperate with receiver 1110, transmitter 1115, or both to perform various operations (e.g., receiving, monitoring, transmitting). For example, communication manager 1120 may receive information from receiver 1110, send information to transmitter 1115, or be integrated with receiver 1110, transmitter 1115, or both to receive information, send information, or perform various other operations as described herein.

[0177] According to the examples disclosed herein, the communication manager 1120 can support wireless communication at a base station. The CP length indication component 1125 can be configured or otherwise supported to support elements for sending a configuration message to the UE, the configuration message including a UE-specific CP length. The communication component 1130 can be configured or otherwise supported to support elements for communicating with the UE by transmitting or receiving signals in one or more symbols using a single-carrier waveform and a CP based on a UE-specific CP length, wherein the one or more symbols are aligned in the time domain with one or more corresponding symbols of a reference OFDM waveform.

[0178] Figure 12 A block diagram 1200 is shown of a communication manager 1220 supporting configurable CP lengths for single-carrier waveforms according to various aspects of this disclosure. The communication manager 1220 may be an example of a communication manager 1020, a communication manager 1120, or aspects of both as described herein. The communication manager 1220 or its various components may be examples of units for performing the various aspects of configurable CP lengths for single-carrier waveforms as described herein. For example, the communication manager 1220 may include a CP length indication component 1225, a communication component 1230, a channel measurement component 1235, a CP length determination component 1240, a feedback receiving component 1245, a CP insertion component 1250, a phase continuity component 1255, or any combination thereof. Each of these components may communicate directly or indirectly with each other (e.g., via one or more buses).

[0179] According to the examples disclosed herein, the communication manager 1220 can support wireless communication at a base station. The CP length indication component 1225 can be configured or otherwise supported to support elements for sending a configuration message to the UE, the configuration message including a UE-specific CP length. The communication component 1230 can be configured or otherwise supported to support elements for communicating with the UE using a single-carrier waveform and a CP based on a UE-specific CP length, wherein the communication includes: transmitting or receiving signals in one or more symbols, the one or more symbols being aligned in the time domain with one or more corresponding symbols of a reference OFDM waveform.

[0180] In some examples, the channel measurement component 1235 may be configured or otherwise supported to perform one or more channel measurements for one or more uplink signals. In some examples, the CP length determination component 1240 may be configured or otherwise supported to determine a UE-specific CP length based on one or more channel measurements.

[0181] In some examples, the feedback receiving component 1245 may be configured or otherwise supported to provide elements for receiving feedback messages from the UE. In some examples, the CP length determining component 1240 may be configured or otherwise supported to provide elements for determining a UE-specific CP length based on the feedback message.

[0182] In some examples, the CP length determination component 1240 may be configured or otherwise support a unit for determining a UE-specific CP length based on channel delay spread, operational CINR, beam switching gap threshold, phase noise mitigation threshold, or a combination thereof.

[0183] In some examples, the CP comprises a set of multiple zero samples, and the CP insertion component 1250 may be configured or otherwise supported for inserting the CP into one or more symbols. In some examples, the phase continuity component 1255 may be configured or otherwise supported for maintaining phase continuity in conjunction with the inserted CP. In some examples, the communication component 1230 may be configured or otherwise supported for transmitting signals based on the inserted CP and maintaining phase continuity.

[0184] Figure 13A diagram of a system 1300 including a device 1305 supporting a configurable CP length for a single-carrier waveform is shown according to various aspects of this disclosure. Device 1305 may be an example of device 1005, device 1105, or base station 105 as described herein, or may include components thereof. Device 1305 may wirelessly communicate with one or more base stations 105, UE 115, or any combination thereof. Device 1305 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, such as a communication manager 1320, a network communication manager 1310, a transceiver 1315, an antenna 1325, a memory 1330, code 1335, a processor 1340, and an inter-station communication manager 1345. These components may communicate electronically or be otherwise coupled (e.g., operational ground, communication ground, functional ground, electronic ground, electrical ground) via one or more buses (e.g., bus 1350).

[0185] The network communication manager 1310 can manage communication with the core network 130 (e.g., via one or more wired backhaul links). For example, the network communication manager 1310 can manage the transmission of data communication to client devices (e.g., one or more UEs 115).

[0186] In some cases, device 1305 may include a single antenna 1325. However, in other cases, device 1305 may have more than one antenna 1325, which are capable of simultaneously transmitting or receiving multiple wireless transmissions. Transceiver 1315 may communicate bidirectionally via one or more antennas 1325, wired or wireless links as described herein. For example, transceiver 1315 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. Transceiver 1315 may also include a modem for modulating packets, providing modulated packets to one or more antennas 1325 for transmission, and demodulating packets received from one or more antennas 1325. Transceiver 1315, or transceiver 1315 and one or more antennas 1325, may be an example of transmitter 1015, transmitter 1115, receiver 1010, receiver 1110, or any combination thereof or components thereof as described herein.

[0187] Memory 1330 may include RAM and ROM. Memory 1330 may store computer-readable, computer-executable code 1335, which includes instructions that, when executed by processor 1340, cause device 1305 to perform the various functions described herein. Code 1335 may be stored in a non-transitory computer-readable medium, such as system memory or another type of memory. In some cases, code 1335 may not be directly executable by processor 1340, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein. In some additional cases, memory 1330 may also contain a BIOS, which controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0188] Processor 1340 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, CPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, processor 1340 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into processor 1340. Processor 1340 may be configured to execute computer-readable instructions stored in memory (e.g., memory 1330) to cause device 1305 to perform various functions (e.g., functions or tasks supporting configurable CP lengths for single-carrier waveforms). For example, device 1305 or components thereof may include processor 1340 and memory 1330 coupled to processor 1340, processor 1340 and memory 1330 being configured to perform the various functions described herein.

[0189] Inter-site communication manager 1345 can manage communication with other base stations 105 and may include a controller or scheduler for cooperating with other base stations 105 to control communication with UE 115. For example, inter-site communication manager 1345 can coordinate the scheduling of transmissions to UE 115 to implement various interference mitigation techniques such as beamforming or joint transmission. In some examples, inter-site communication manager 1345 may provide an X2 interface within LTE / LTE-A wireless communication network technology to facilitate communication between base stations 105.

[0190] Based on the examples disclosed herein, the communication manager 1320 can support wireless communication at a base station. For example, the communication manager 1320 can be configured or otherwise supported to support elements for sending a configuration message to a UE, the configuration message including a UE-specific CP length. The communication manager 1320 can be configured or otherwise supported to support elements for communicating with a UE using a single-carrier waveform and a CP based on a UE-specific CP length, wherein the communication includes: transmitting or receiving signals in one or more symbols, the one or more symbols being aligned in the time domain with one or more corresponding symbols of a reference OFDM waveform.

[0191] In some examples, the communication manager 1320 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or in cooperation with transceiver 1315, one or more antennas 1325, or any combination thereof. Although the communication manager 1320 is shown as a separate component, in some examples, one or more functions described with reference to the communication manager 1320 may be supported or executed by processor 1340, memory 1330, code 1335, or any combination thereof. For example, code 1335 may include instructions executable by processor 1340 to cause device 1305 to perform various aspects of the configurable CP length for a single-carrier waveform as described herein, or processor 1340 and memory 1330 may be otherwise configured to perform or support such operations.

[0192] Figure 14 A flowchart illustrating a method 1400 for supporting a configurable CP length for a single-carrier waveform according to various aspects of this disclosure is shown. Operation of method 1400 can be implemented by a UE or its components as described herein. For example, operation of method 1400 can be implemented by, as referenced... Figures 1 to 9 The UE 115 described is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional units of the UE to perform the described function. Alternatively, the UE can use dedicated hardware to perform aspects of the described function.

[0193] At 1405, the method may include: receiving a configuration message indicating a UE-specific CP length for communicating with the base station. The operation at 1405 can be performed according to examples as disclosed herein. In some examples, aspects of the operation at 1405 may be provided by reference to... Figure 8 The CP length configuration component 825 is described for execution.

[0194] At 1410, the method may include: communicating with a base station using a single-carrier waveform and a CP based on a UE-specific CP length, wherein the communication involves: transmitting or receiving signals in one or more symbols, said one or more symbols being aligned in the time domain with one or more corresponding symbols of a reference OFDM waveform. The operation of 1410 can be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1410 may be derived from, as referenced... Figure 8 The described communication component 830 is used to perform this.

[0195] Figure 15 A flowchart illustrating a method 1500 for supporting a configurable CP length for a single-carrier waveform according to various aspects of this disclosure is shown. Operation of method 1500 can be implemented by a UE or its components as described herein. For example, operation of method 1500 can be implemented by, as referenced... Figures 1 to 9 The UE 115 described is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional units of the UE to perform the described function. Alternatively, the UE can use dedicated hardware to perform aspects of the described function.

[0196] At 1505, the method may include: determining the nominal CP length based on the RAT numerical scheme. The operation at 1505 can be performed according to examples as disclosed herein. In some examples, aspects of the operation at 1505 may be derived from, as referenced... Figure 8 The nominal CP length component 845 is described to perform this.

[0197] At 1510, the method may include: receiving a configuration message from a base station, the configuration message indicating a UE-specific CP length. The operation at 1510 can be performed according to examples as disclosed herein. In some examples, aspects of the operation at 1510 may be derived from references... Figure 8 The CP length configuration component 825 is described for execution.

[0198] At 1515, the method may include: avoiding the use of a nominal CP length for the CP based on receiving a configuration message indicating a UE-specific CP length. The operation at 1515 can be performed according to examples as disclosed herein. In some examples, aspects of the operation at 1515 may be provided by reference to... Figure 8 The nominal CP length component 845 is described to perform this.

[0199] At 1520, the method may include: communicating with a base station using a single-carrier waveform and a CP based on a UE-specific CP length. Communication may involve: transmitting or receiving signals in one or more symbols that can be aligned in the time domain with one or more corresponding symbols of a reference OFDM waveform. The operation at 1520 can be performed according to examples as disclosed herein. In some examples, aspects of the operation at 1520 may be derived from, as referenced... Figure 8 The described communication component 830 is used to perform this.

[0200] Figure 16 A flowchart illustrating a method 1600 for supporting a configurable CP length for a single-carrier waveform according to various aspects of this disclosure is shown. Operation of method 1600 can be implemented by a UE or its components as described herein. For example, operation of method 1600 can be implemented by, as referenced... Figures 1 to 9 The UE 115 described is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional units of the UE to perform the described function. Alternatively, the UE can use dedicated hardware to perform aspects of the described function.

[0201] At 1605, the method may include: measuring the channel delay spread between the base station and the UE. The operation at 1605 can be performed according to examples as disclosed herein. In some examples, aspects of the operation at 1605 may be derived from references... Figure 8 The described delay extension component 870 is used for execution.

[0202] At 1610, the method may include sending a feedback message to the base station indicating the measured channel delay spread. The operation of 1610 can be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1610 may be derived from references... Figure 8 The described feedback component 850 is used for execution.

[0203] At 1615, the method may include: receiving a configuration message from a base station indicating a UE-specific CP length, wherein the UE-specific CP length is based on a measured channel delay spread indicated by a feedback message. The operation of 1615 can be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1615 may be provided by reference to... Figure 8 The CP length configuration component 825 is described for execution.

[0204] At 1620, the method may include: communicating with a base station using a single-carrier waveform and a CP based on a UE-specific CP length. Communication may involve: transmitting or receiving signals in one or more symbols that can be aligned in the time domain with one or more corresponding symbols of a reference OFDM waveform. The operation of 1620 can be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1620 may be derived from, as referenced... Figure 8 The described communication component 830 is used to perform this.

[0205] Figure 17 A flowchart illustrating a method 1700 for supporting a configurable CP length for a single-carrier waveform according to various aspects of this disclosure is shown. Operation of method 1700 can be implemented by a base station or its components as described herein. For example, operation of method 1700 can be implemented by, as referred to... Figures 1 to 5 The base station 105 described in 10 to 13 is used to perform this function. In some examples, the base station may execute a set of instructions to control the functional units of the base station to perform the described functions. Alternatively, the base station may use dedicated hardware to perform aspects of the described functions.

[0206] At 1705, the method may include: sending a configuration message to the UE, the configuration message including a UE-specific CP length. The operation at 1705 can be performed according to examples as disclosed herein. In some examples, aspects of the operation at 1705 may be derived from references... Figure 12 The described CP length indicator component 1225 is used for execution.

[0207] At 1710, the method may include: communicating with the UE using a single-carrier waveform and a CP based on a UE-specific CP length, wherein the communication may involve: transmitting or receiving signals in one or more symbols, said one or more symbols being aligned in the time domain with one or more corresponding symbols of a reference OFDM waveform. The operation of 1710 can be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1710 may be derived from references... Figure 12 The described communication component 1230 is used to perform this.

[0208] The following provides an overview of various aspects of this disclosure:

[0209] Aspect 1: A method for wireless communication at a UE, comprising: receiving a configuration message indicating a UE-specific CP length for communicating with a base station; and communicating with the base station using a single-carrier waveform and a CP at least partially based on the UE-specific CP length, wherein the communication comprises: transmitting or receiving signals in one or more symbols, the one or more symbols being aligned in the time domain with one or more corresponding symbols of a reference OFDM waveform.

[0210] Aspect 2: The method according to aspect 1, wherein the communication includes: inserting the CP into each of the one or more symbols at least in part based on channel delay spread; and transmitting the signal after the insertion of the CP.

[0211] Aspect 3: According to the method of aspect 1, wherein the communication includes: determining a symbol corresponding to a beam switching operation; inserting the CP into the determined symbol based at least in part on a beam switching delay for the beam switching operation; and transmitting the signal after inserting the CP.

[0212] Aspect 4: The method according to aspect 3 further includes: determining that the beam switching delay is greater than a nominal cyclic prefix length associated with a digital scheme for the radio access technology used by the UE, wherein the symbol corresponding to the beam switching operation is determined at least in part based on the beam switching delay being greater than the nominal cyclic prefix length, and the cyclic prefix is ​​inserted at least in part based on the beam switching delay being greater than the nominal cyclic prefix length.

[0213] Aspect 5: The method according to any one of Aspects 1 to 4 further includes: determining the nominal CP length based at least in part on the digital scheme of the RAT; and avoiding using the nominal CP length for the CP based at least in part on receiving the configuration message indicating the UE-specific CP length.

[0214] Aspect 6: According to the method of aspect 5, wherein the communication includes: receiving the signal; and performing an FFT on the signal using an FFT size, the FFT size being the same for the UE-specific CP length and the nominal CP length.

[0215] Aspect 7: The method according to any one of Aspects 1 to 6, wherein the CP comprises a plurality of zero samples.

[0216] Aspect 8: The method according to any one of Aspects 1 to 7, wherein the UE-specific CP length is greater than the nominal CP length associated with the digital scheme of the RAT for the UE.

[0217] Aspect 9: The method according to any one of Aspects 1 to 7, wherein the UE-specific CP length is less than the nominal CP length associated with the digital scheme of the RAT for the UE, and the UE-specific CP length is at least partially based on the DFT size.

[0218] Aspect 10: The method according to aspect 9, wherein the communication includes: receiving the signal; and performing a DFT on the signal using the DFT size and at least in part based on the UE-specific CP length.

[0219] Aspect 11: The method according to any one of Aspects 1 to 10 further includes: sending a feedback message to the base station, wherein the UE-specific CP length is at least partially based on the feedback message.

[0220] Aspect 12: The method according to aspect 11 further includes: measuring the channel delay spread between the base station and the UE, wherein the feedback message indicates the measured channel delay spread, and the UE-specific CP length is at least partially based on the measured channel delay spread.

[0221] Aspect 13: The method according to aspect 12 further includes: determining a channel delay spread index from a lookup table based at least in part on the measured channel delay spread, wherein the feedback message includes the channel delay spread index.

[0222] Aspect 14: The method according to any one of Aspects 11 to 12, wherein the UE-specific CP length includes a first CP length, the method further comprising: determining a second CP length from a configured set of CP lengths, wherein the feedback message includes a request for the second CP length, and the first CP length is at least partially based on the second CP length.

[0223] Aspect 15: The method according to any one of Aspects 11 to 14, wherein the feedback message includes a CSI feedback message.

[0224] Aspect 16: The method according to any one of Aspects 1 to 15, wherein the configuration message further indicates a BWP configuration, the BWP configuration including at least one or more associations between one or more BWPs and one or more CP lengths, the method further comprising: determining a BWP for communication among the one or more BWPs; and determining the UE-specific CP length based at least in part on the association between the determined BWP and the UE-specific CP length in the one or more associations.

[0225] Aspect 17: The method according to any one of Aspects 1 to 16, wherein the configuration message indicates an active period for the UE-specific CP length, the method further comprising: communicating using the UE-specific CP length during the active period.

[0226] Aspect 18: The method according to aspect 17 further includes: determining the expiration of the activity period; and communicating using a nominal CP length associated with a digital scheme for the RAT of the UE, based at least in part on the expiration of the activity period.

[0227] Aspect 19: The method according to any one of Aspects 1 to 18, wherein the configuration message includes an index value corresponding to the UE-specific CP length in a set of configured CP lengths.

[0228] Aspect 20: The method according to any one of Aspects 1 to 18, wherein the configuration message includes an absolute length value of the UE-specific CP length.

[0229] Aspect 21: The method according to any one of Aspects 1 to 20, wherein the UE-specific CP length is based at least in part on channel delay spread, operational CINR, beam switching gap threshold, phase noise reduction threshold, or a combination thereof.

[0230] Aspect 22: The method according to any one of Aspects 1 to 21, wherein the configuration message includes a DCI message, a MAC-CE message, an RRC message, or a combination thereof.

[0231] Aspect 23: A method for wireless communication at a base station, comprising: sending a configuration message to a UE, the configuration message including a UE-specific CP length; and communicating with the UE using a single-carrier waveform and a CP at least partially based on the UE-specific CP length, wherein the communication includes: transmitting or receiving signals in one or more symbols, the one or more symbols being aligned in the time domain with one or more corresponding symbols of a reference OFDM waveform.

[0232] Aspect 24: The method according to aspect 23 further includes: performing one or more channel measurements for one or more uplink signals; and determining the UE-specific CP length based at least in part on the one or more channel measurements.

[0233] Aspect 25: The method according to any one of Aspects 23 to 24 further includes: receiving a feedback message from the UE; and determining the UE-specific CP length based at least in part on the feedback message.

[0234] Aspect 26: The method according to any one of Aspects 23 to 25 further includes: determining the UE-specific CP length based at least in part on channel delay spread, operational CINR, beam switching gap threshold, phase noise reduction threshold, or a combination thereof.

[0235] Aspect 27: The method according to any one of Aspects 23 to 26, wherein the CP comprises a plurality of zero samples, and the communication comprises: inserting the CP into the one or more symbols; maintaining phase continuity in conjunction with the insertion of the CP; and transmitting the signal at least in part based on the insertion of the CP and maintaining the phase continuity.

[0236] Aspect 28: An apparatus for wireless communication, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method according to any one of aspects 1 to 22.

[0237] Aspect 29: An apparatus for wireless communication, comprising at least one unit for performing the method according to any one of aspects 1 to 22.

[0238] Aspect 30: A non-transitory computer-readable medium storing code for wireless communication at a UE, said code comprising instructions executable by a processor to perform the method according to any one of aspects 1 to 22.

[0239] Aspect 31: An apparatus for wireless communication, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method according to any one of aspects 23 to 27.

[0240] Aspect 32: An apparatus for wireless communication, comprising at least one unit for performing the method according to any one of aspects 23 to 27.

[0241] Aspect 33: A non-transitory computer-readable medium storing code for wireless communication at a base station, the code including instructions executable by a processor to perform the method according to any one of aspects 23 to 27.

[0242] It should be noted that the methods described in this paper describe possible implementations, and the operations and steps can be rearranged or otherwise modified, and other implementations are possible. Furthermore, aspects from two or more methods can be combined.

[0243] While aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for illustrative purposes, and the terms LTE, LTE-A, LTE-A Pro, or NR may be used extensively in the description, the techniques described herein apply beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the techniques described can be applied to a variety of other wireless communication systems, such as Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0244] The information and signals described herein can be represented using any of a variety of different techniques and methods. For example, the data, instructions, commands, information, signals, bits, symbols, and chips mentioned throughout the description may be represented by voltage, current, electromagnetic waves, magnetic fields or particles, light fields or particles, or any combination thereof.

[0245] The various illustrative blocks and components described herein can be implemented or performed using a general-purpose processor, DSP, ASIC, CPU, FPGA, or other programmable logic device, discrete gate or transistor logic, discrete hardware component, or any combination thereof designed to perform the functions described herein. The general-purpose processor may be a microprocessor, but alternatively, the processor may be any processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors combined with a DSP core, or any other such configuration).

[0246] The functions described herein can be implemented using hardware, software executed by a processor, firmware, or any combination thereof. If implemented using software executed by a processor, the functions can be stored as one or more instructions or code on or transmitted through a computer-readable medium. Other examples and implementations are within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described herein can be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination of these. Features implementing the functions can also be physically located in various locations, including being distributed such that different parts of the functions are implemented in different physical locations.

[0247] Computer-readable media includes both non-transitory computer storage media and communication media, with communication media encompassing any medium that facilitates the transfer of computer programs from one place to another. Non-transitory storage media can be any available medium accessible by a general-purpose computer or a special-purpose computer. By way of example, and not limitation, non-transitory computer-readable media can include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compressed optical disc (CD) ROM or other optical disc storage, disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to carry or store desired units of program code in the form of instructions or data structures, and accessible by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Furthermore, any connection is appropriately referred to as computer-readable media. For example, if software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included within the definition of computer-readable media. As used herein, disks and optical discs include CDs, laser discs, optical discs, digital multifunction discs (DVDs), floppy disks, and Blu-ray discs, wherein disks typically copy data magnetically, while optical discs use lasers to copy data optically. The combinations described above are also included within the scope of computer-readable media.

[0248] As used herein (including in the claims), the word "or" in a list of items (e.g., a list of items ending with a phrase such as "at least one of" or "one or more of") indicates an inclusive list, such that a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Furthermore, as used herein, the phrase "based on" should not be construed as a reference to a closed set of conditions. For example, an example step described as "based on condition A" could be based on both condition A and condition B without departing from the scope of this disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same way as the phrase "at least partially based on".

[0249] In the accompanying drawings, similar components or features may have the same reference numerals. Furthermore, various components of the same type can be distinguished by a dash and a second reference numeral following the reference numeral, used to differentiate between similar components. If only the first reference numeral is used in the specification, the description applies to any one of the similar components having the same first reference numeral, without regard to the second reference numeral or other subsequent reference numerals.

[0250] This document describes exemplary configurations in conjunction with the accompanying drawings, and does not represent all examples that can be implemented or that are within the scope of the claims. The term "example" as used herein means "serving as an example, instance, or illustration," and not "preferred" or "advantageous over other examples." The detailed description includes specific details for the purpose of providing an understanding of the described techniques. However, these techniques can be implemented without these specific details. In some cases, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0251] The description herein is provided to enable those skilled in the art to implement or use the present disclosure. Various modifications to the present disclosure will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other variations without departing from the scope of the disclosure. Therefore, the present disclosure is not limited to the examples and designs described herein, but is to be given the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at a user equipment (UE), comprising: receiving a configuration message indicating a UE-specific cyclic prefix length for communicating with a network device, wherein the UE-specific cyclic prefix length is different from a nominal cyclic prefix length associated with a numerology of a radio access technology for the UE; and communicating with the network device using a single-carrier waveform and a cyclic prefix based at least in part on the UE-specific cyclic prefix length, wherein the communicating includes transmitting or receiving a signal in one or more symbols of the single-carrier waveform that are aligned in a time domain with one or more corresponding symbols of a reference orthogonal frequency division multiplexing waveform.

2. The method of claim 1, wherein, the communicating includes: inserting the cyclic prefix into each of the one or more symbols based at least in part on a channel delay spread; and transmitting the signal after the inserting the cyclic prefix.

3. The method of claim 1, wherein, the communicating includes: determining a symbol corresponding to a beam switch operation; inserting the cyclic prefix into the determined symbol based at least in part on a beam switch delay for the beam switch operation; and transmitting the signal after the inserting the cyclic prefix.

4. The method of claim 3, further comprising: determining that the beam switch delay is greater than the nominal cyclic prefix length, wherein the symbol corresponding to the beam switch operation is determined based at least in part on the beam switch delay being greater than the nominal cyclic prefix length, and the cyclic prefix is inserted based at least in part on the beam switch delay being greater than the nominal cyclic prefix length.

5. The method of claim 1, further comprising: avoiding using the nominal cyclic prefix length for the cyclic prefix based at least in part on receiving the configuration message indicating the UE-specific cyclic prefix length.

6. The method of claim 5, wherein, the communicating includes: receiving the signal; and performing a fast Fourier transform on the signal using a fast Fourier transform size that is the same for the UE-specific cyclic prefix length and the nominal cyclic prefix length.

7. The method of claim 1, wherein, the cyclic prefix includes a plurality of zero samples.

8. The method of claim 7, wherein, the UE-specific cyclic prefix length is greater than the nominal cyclic prefix length.

9. The method of claim 1, wherein, the UE-specific cyclic prefix length is less than the nominal cyclic prefix length, and the UE-specific cyclic prefix length is based at least in part on a discrete Fourier transform size.

10. The method of claim 9, wherein, the communicating includes: receiving the signal; and performing a discrete Fourier transform on the signal using the discrete Fourier transform size and based at least in part on the UE-specific cyclic prefix length.

11. The method of claim 1, further comprising: transmitting a feedback message to the network device, wherein the UE-specific cyclic prefix length is based at least in part on the feedback message.

12. The method of claim 11, further comprising: measuring a channel delay spread between the network device and the UE, wherein the feedback message indicates the measured channel delay spread and the UE-specific cyclic prefix length is based at least in part on the measured channel delay spread.

13. The method of claim 12, further comprising: determining a channel delay spread index from a lookup table based at least in part on the measured channel delay spread, wherein the feedback message comprises the channel delay spread index.

14. The method of claim 11, wherein, the UE-specific cyclic prefix length comprises a first cyclic prefix length, the method further comprising: determining a second cyclic prefix length from a set of configured cyclic prefix lengths, wherein the feedback message comprises a request for the second cyclic prefix length and the first cyclic prefix length is based at least in part on the second cyclic prefix length.

15. The method of claim 11, wherein, the feedback message comprises a channel state information feedback message.

16. The method of claim 1, wherein, the configuration message further indicates a bandwidth part configuration comprising at least one or more associations between one or more bandwidth parts and one or more cyclic prefix lengths, the method further comprising: determining a bandwidth part of the one or more bandwidth parts for communication; and determining the UE-specific cyclic prefix length based at least in part on an association of the one or more associations between the determined bandwidth part and the UE-specific cyclic prefix length.

17. The method of claim 1, wherein, the configuration message indicates an active period for the UE-specific cyclic prefix length, the method further comprising: communicating during the active period using the UE-specific cyclic prefix length.

18. The method of claim 17, further comprising: determining an expiration of the active period; and communicating using the nominal cyclic prefix length based at least in part on the expiration of the active period.

19. The method of claim 1, wherein, the configuration message comprises an index value corresponding to the UE-specific cyclic prefix length in a set of configured cyclic prefix lengths.

20. The method of claim 1, wherein, the configuration message comprises an absolute length value for the UE-specific cyclic prefix length.

21. The method of claim 1, wherein, the UE-specific cyclic prefix length is based at least in part on a channel delay spread, an operating carrier to interference plus noise ratio, a beam switch gap threshold, a phase noise mitigation threshold, or a combination thereof.

22. The method of claim 1, wherein, the configuration message comprises a downlink control information message, a medium access control element, a radio resource control message, or a combination thereof.

23. A method for wireless communication at a network device, comprising: transmitting, to a user equipment (UE), a configuration message comprising a UE-specific cyclic prefix length, wherein the UE-specific cyclic prefix length is different from a nominal cyclic prefix length associated with a numerology of a radio access technology for the UE; and communicating with the UE using the UE-specific cyclic prefix length. communicate with the UE using a single-carrier waveform and a cyclic prefix based at least in part on the UE-specific cyclic prefix length, wherein the communicating includes transmitting or receiving a signal in one or more symbols of the single-carrier waveform that are aligned in a time domain with one or more corresponding symbols of a reference orthogonal frequency division multiplexing waveform.

24. The method of claim 23, further comprising: performing one or more channel measurements for one or more uplink signals; and determining the UE-specific cyclic prefix length based at least in part on the one or more channel measurements.

25. The method of claim 23, further comprising: receiving a feedback message from the UE; and determining the UE-specific cyclic prefix length based at least in part on the feedback message.

26. The method of claim 23, further comprising: determining the UE-specific cyclic prefix length based at least in part on a channel delay spread, an operating carrier-to-interference plus noise ratio, a beam switching gap threshold, a phase noise mitigation threshold, or a combination thereof.

27. The method of claim 23, wherein, the cyclic prefix includes a plurality of zero samples, and the communicating includes: inserting the cyclic prefix into the one or more symbols; maintaining phase continuity in connection with inserting the cyclic prefix; and transmitting the signal based at least in part on inserting the cyclic prefix and maintaining the phase continuity.

28. An apparatus for wireless communication, comprising: a processor; memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method of any of claims 1-22.

29. An apparatus for wireless communication, comprising: a processor; memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method of any of claims 23-27.

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