Physical Random Access Channel (PRACH) transmission in New Radio (NR)

Abstract

A wireless communication system and method related to random access signaling are provided. A user equipment (UE) may send a random access signal to a base station (BS) in a frequency band, the random access signal including at least one of a time length or a frequency length based on a subcarrier spacing (SCS) in the frequency band. The BS may receive the random access signal and send a response to the random access signal.

Description

[0001] Cross-references and priority claims to related applications

[0002] This application claims priority to and the benefit of U.S. Patent Application No. 17 / 249,167, filed on February 22, 2021, and priority to and the benefit of U.S. Provisional Patent Application No. 62 / 981,405, filed on February 25, 2020, each of which is hereby incorporated by reference in its entirety as if fully set forth below and for all applicable purposes. Technical Field

[0003] The present application relates to wireless communication systems, and more particularly to improving performance and communication device efficiency in wireless networks operating on high millimeter wave (mmWave) frequency bands by communicating one or more repetitions of a preamble format signal in time and / or frequency based on a subcarrier spacing (SCS). Background Art

[0004] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcast, etc. These systems may be able to support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). A wireless multiple-access communication system may include multiple base stations (BSs), each of which simultaneously supports communication for multiple communication devices, which may be referred to as user equipment (UE).

[0005] To meet the growing demand for extended mobile broadband connections, wireless communication technology is evolving from long-term evolution (LTE) technology to next-generation new radio (NR) technology, which may be referred to as the fifth generation (5G). For example, NR is designed to provide lower latency, higher bandwidth or higher throughput, and higher reliability than LTE. NR is designed to operate on a wide array of spectrum bands, for example, from low bands below about 1 gigahertz (GHz) and mid-bands from about 1 GHz to about 6 GHz, to high bands such as millimeter wave (mmWave) bands. NR is also designed to operate across different spectrum types, from licensed spectrum to unlicensed and shared spectrum. Spectrum sharing enables operators to have the opportunity to aggregate spectrum to dynamically support high-bandwidth services. Spectrum sharing can extend the benefits of NR technology to operating entities that may not have access to licensed spectrum.

[0006] The UE may send a random access preamble signal to the BS to initiate network access. If the UE sends the random access preamble signal using a large subcarrier spacing (SCS), the duration of the symbol of the random access preamble signal may be smaller than when the UE sends the random access preamble signal using a smaller SCS. Such transmission may result in reduced signal coverage. Conversely, if the UE sends the random access preamble signal using a smaller SCS, the UE may not be able to transmit at full transmit power due to power limitations (e.g., power spectral density (PSD) limitations). Summary of the invention

[0007] The following summarizes some aspects of the present disclosure to provide a basic understanding of the technology discussed. This summary is not a broad overview of all expected features of the present disclosure, and is neither intended to identify key or important elements of all aspects of the present disclosure, nor is it intended to delineate the scope of any or all aspects of the present disclosure. Its sole purpose is to present some concepts of one or more aspects of the present disclosure in summary form as a preface to a more detailed description presented later.

[0008] In one aspect of the present disclosure, a method of wireless communication includes: a first wireless communication device and a second wireless communication device communicate and transmit a random access signal in a frequency band, the random access signal including at least one of a time length or a frequency length based on a subcarrier spacing (SCS) in the frequency band; and the first wireless communication device and the second wireless communication device communicate and transmit a random access response in response to the random access signal.

[0009] In an additional aspect of the present disclosure, an apparatus includes a transceiver configured to: transmit a random access signal by a first wireless communication device and a second wireless communication device in a frequency band, wherein the random access signal includes at least one of a time length or a frequency length based on an SCS in the frequency band; and transmit a random access response in response to the random access signal by the first wireless communication device and the second wireless communication device in communication.

[0010] In an additional aspect of the present disclosure, a computer-readable medium having program code recorded thereon includes: code for causing a first wireless communication device to communicate with a second wireless communication device in a frequency band to transmit a random access signal, wherein the random access signal includes at least one of a time length or a frequency length based on an SCS in the frequency band; and code for causing the first wireless communication device to communicate with the second wireless communication device to transmit a random access response in response to the random access signal.

[0011] In an additional aspect of the present disclosure, an apparatus includes: a component for communicating with a second wireless communication device in a frequency band to transmit a random access signal, the random access signal including at least one of a time length or a frequency length based on an SCS in the frequency band; and a component for communicating with the second wireless communication device to transmit a random access response in response to the random access signal.

[0012] After reading the following description of specific exemplary embodiments in conjunction with the accompanying drawings, other aspects, features, and embodiments will become apparent to those of ordinary skill in the art. Although features may be discussed with respect to certain embodiments and drawings below, all embodiments may include one or more of the advantageous features discussed herein. In other words, although one or more embodiments may be discussed as having certain advantageous features, one or more of these features may also be used according to the various embodiments discussed herein. In a similar manner, although exemplary embodiments may be discussed below as device, system, or method embodiments, it should be understood that such exemplary embodiments may be implemented in various devices, systems, and methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A wireless communication network in accordance with one or more aspects of the present disclosure is shown.

[0014] Figure 2 A physical random access channel (PRACH) preamble signal configuration according to one or more aspects of the present disclosure is shown.

[0015] Figure 3 Various short PRACH format configurations are shown in accordance with one or more aspects of the present disclosure.

[0016] Figure 4 Various long PRACH format configurations are shown in accordance with one or more aspects of the present disclosure.

[0017] Figure 5 PRACH format configurations according to one or more aspects of the present disclosure are shown.

[0018] Figure 6 is a block diagram of an example user equipment (UE) according to one or more aspects of the present disclosure.

[0019] Figure 7 is a block diagram of an example base station (BS) according to one or more aspects of the present disclosure.

[0020] Figure 8 A random access signal configuration including multiple repetitions of a PRACH sequence in time according to one or more aspects of the present disclosure is shown.

[0021] Fig. 9A random access signal configuration including gaps in accordance with one or more aspects of the present disclosure is shown.

[0022] Fig.10 A random access signal configuration including multiple repetitions of a PRACH sequence in frequency according to one or more aspects of the present disclosure is shown.

[0023] Fig.11 A random access signal configuration including a long PRACH sequence spanning a wide bandwidth in accordance with one or more aspects of the present disclosure is shown.

[0024] Fig.12 is a flow chart of a wireless communication method according to one or more aspects of the present disclosure.

[0025] Fig.13 is a flow chart of a wireless communication method according to one or more aspects of the present disclosure. DETAILED DESCRIPTION

[0026] The specific embodiments described below in conjunction with the accompanying drawings are intended as descriptions of various configurations, rather than being intended to represent the only configurations in which the concepts described herein may be practiced. For the purpose of providing a thorough understanding of the various concepts, the specific embodiments include specific details. However, it will be apparent to those skilled in the art that these concepts may be practiced without these specific details. In some instances, well-known structures and components are shown in block diagram form to avoid obscuring these concepts.

[0027] The present disclosure generally relates to wireless communication systems, also referred to as wireless communication networks. In various embodiments, these techniques and devices can be used for wireless communication networks, such as code division multiple access (CDMA) networks, time division multiple access (TDMA) networks, frequency division multiple access (FDMA) networks, orthogonal FDMA (OFDMA) networks, single carrier FDMA (SC-FDMA) networks, LTE networks, global mobile communication systems (GSM) networks, fifth generation (5G) or new radio (NR) networks, and other communication networks. As described herein, the terms "network" and "system" can be used interchangeably.

[0028] OFDMA network can realize radio technology such as Evolved UTRA (E-UTRA), Institute of Electrical and Electronics Engineers (IEEE) 802.11, IEEE 802.16, IEEE 802.20, flash-OFDM, etc. UTRA, E-UTRA and GSM are part of Universal Mobile Telecommunications System (UMTS). Specifically, Long Term Evolution (LTE) is a version of UMTS using E-UTRA. UTRA, E-UTRA, GSM, UMTS and LTE are described in documents provided by an organization named "3rd Generation Partnership Project" (3GPP), and cdma2000 is described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2). These various radio technologies and standards are known or under development. For example, the 3rd Generation Partnership Project (3GPP) is a collaboration between telecommunications association groups that aims to define a globally applicable third generation (3G) mobile phone specification. 3GPP Long Term Evolution (LTE) is a 3GPP project aimed at improving the UMTS mobile phone standard. 3GPP may define specifications for next generation mobile networks, mobile systems, and mobile devices. The present disclosure relates to the evolution of wireless technology from LTE, 4G, 5G, NR and beyond, where access to the wireless spectrum is shared between networks using a new and different set of radio access technologies or radio air interfaces.

[0029] Specifically, 5G networks envision different deployments, different spectrums, and different services and devices that can be implemented using a unified air interface based on OFDM. To achieve these goals, in addition to developing new radio technologies for 5G NR networks, further enhancements to LTE and LTE-A are also being considered. 5G NR will (1) be able to scale to networks with ultra-high density (e.g., ~1M nodes / km) and (2) be able to scale to networks with ultra-high density (e.g., ~1M nodes / km). 2 ), ultra-low complexity (e.g., ~10s bit / s), ultra-low energy (e.g., ~10+ years battery life), and deep coverage with the ability to reach challenging locations; (2) including mission-critical control with strong security to protect sensitive personal, financial, or confidential information, ultra-high reliability (e.g., ~99.9999% reliability), ultra-low latency (e.g., ~1ms), and users with wide mobility range or lack of mobility range; and (3) with enhanced mobile broadband, including extremely high capacity (e.g., ~10Tbps / km 2 ), extremely high data rates (e.g., multi-Gbps rates, 100+Mbps user experience rates), and deep perception with advanced discovery and optimization.

[0030] The 5G NR communication system can be implemented to use an optimized OFDM-based waveform with a scalable numerology and transmission time interval (TTI). Additional features may also include a common, flexible framework to effectively multiplex services and features using dynamic, low-latency time division duplex (TDD) / frequency division duplex (FDD) designs; and the use of advanced wireless technologies such as massive multiple-input multiple-output (MIMO), robust millimeter wave (mmWave) transmission, advanced channel decoding, and device-centric mobility. The scalability of the numerology in 5G NR, along with the expansion of subcarrier spacing, can effectively address the operation of different services across different spectrums and different deployments. For example, in various outdoor and macro coverage deployments less than 3GHz FDD / TDD implementations, a subcarrier spacing of 15kHz may appear on bandwidths (BW) such as 5, 10, and 20MHz. For various other outdoor and small cell coverage deployments with TDD greater than 3GHz, a subcarrier spacing of 30kHz may appear on 80 / 100MHz BW. For various other indoor broadband implementations, using TDD on the unlicensed portion of the 5GHz band, a subcarrier spacing of 60kHz may occur at 160MHz BW. Finally, for various deployments transmitting with mmWave components over TDD at 28GHz, a subcarrier spacing of 120kHz may occur at 500MHz BW.

[0031] 5G NR's scalable parameter set facilitates scalable TTI for different latency and quality of service (QoS) requirements. For example, shorter TTIs can be used for low latency and high reliability, while longer TTIs can be used for higher spectral efficiency. Efficient multiplexing of long and short TTIs allows transmissions to start on symbol boundaries. 5G NR also envisions a self-contained integrated subframe design with UL / downlink scheduling information, data, and acknowledgment in the same subframe. The self-contained integrated subframe supports communications in unlicensed or contention-based shared spectrum, adaptive UL / downlink, which can be flexibly configured on a per-cell basis to dynamically switch between uplink and downlink to meet current traffic demands.

[0032] Various other aspects and features of the present disclosure are further described below. It should be clear that the teachings herein can be implemented in various forms, and any specific structure, function, or both disclosed herein are only representative and not restrictive. Based on the teachings herein, it should be understood by those of ordinary skill in the art that the aspects disclosed herein can be implemented independently of any other aspects, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement a device or practice a method. In addition, other structures, functions, or structures and functions other than or different from one or more aspects described herein can be used to implement such a device or practice such a method. For example, the method can be implemented as a part of a system, device, device, and / or implemented as an instruction stored on a computer-readable medium for execution on a processor or computer. In addition, an aspect can include at least one element of a claim.

[0033] The present application describes a mechanism for communicating a random access preamble signal in a spectrum. The spectrum may be a shared spectrum or an unlicensed spectrum. The channel bandwidth at a high frequency band (e.g., mmWave band) may be wide or large. One method of maintaining a certain implementation or processing complexity (e.g., fast Fourier transform (FFT) processing, baseband processing) at a wireless communication device is to utilize a large subcarrier spacing (SCS). For example, at a frequency band above about 52.6 gigahertz, an SCS of about 960kHz may be used to limit the FFT size to about 4K or less while supporting a larger BW (e.g., 2GHz). At a high mmWave band, when a UE sends a random access preamble signal using a large SCS, the duration of the symbol of the random access preamble signal may be smaller than when the UE sends a random access preamble signal using a smaller SCS. The symbol durations of the SCS and random access preamble signals are inversely correlated. A shorter symbol time duration may result in a reduction in physical random access channel (PRACH) coverage.

[0034] In some aspects, the UE may send a random access preamble signal to the BS in a frequency band, wherein the random access preamble signal is based on a subcarrier spacing (SCS) in the frequency band. In some examples, in order to compensate for the reduction in PRACH coverage due to a shorter symbol duration with a larger SCS, the UE may send a random access preamble signal including a time length, wherein the random access preamble signal may include multiple repetitions of a PRACH format signal during the time length. The repetition of the PRACH format signal in time may compensate for the shorter symbol duration. In some examples, a large SCS may refer to an SCS of at least 120kHz (e.g., 120kHz, 240kHz, 480kHz, 960kHz, etc.), and a small SCS may refer to an SCS below 120kHz (e.g., 15kHz, 30kHz, 60kHz, etc.).

[0035] Another method of maintaining a certain implementation or processing complexity (e.g., baseband processing) at a wireless communication device is to maintain the use of a small SCS. If the UE uses a small SCS to send a random access preamble signal, the bandwidth used for transmission may be limited, and the transmit power may also be limited accordingly. For example, if the UE transmits in a narrow bandwidth, the UE may not expect to increase the transmit power because the average power may exceed the limit (e.g., the power spectral density (PSD) limit). In order to transmit at the full power of the UE under such conditions (e.g., 23 decibel milliwatts (dBm)), the UE can increase the bandwidth of the signal transmission. To this end, the random access preamble signal may include multiple repetitions of a PRACH format signal across a frequency length. In some examples, in order to transmit at the full power of the UE due to a smaller PRACH SCS, the UE may send a random access preamble signal including a frequency length, wherein the random access preamble signal may include multiple repetitions of the PRACH format signal during the frequency length. It should be understood that a single long sequence, a single instance and / or no repetition can be used for a time length and / or a frequency length.

[0036] Figure 1 A wireless communication network 100 is shown according to some aspects of the present disclosure. The network 100 may be a 5G network. The network 100 includes a plurality of base stations (BSs) 105 (labeled 105a, 105b, 105c, 105d, 105e, and 105f, respectively) and other network entities. The BS 105 may be a station that communicates with the UE 115, and may also be referred to as an evolved Node B (eNB), a next generation eNB (gNB), an access point, etc. Each BS 105 may provide communication coverage for a particular geographic area. In 3GPP, the term "cell" may refer to this particular geographic coverage area of ​​the BS 105 and / or a BS subsystem serving the coverage area, depending on the context in which the term is used.

[0037] The BS 105 may provide communication coverage for macro cells or small cells (such as pico cells or femto cells) and / or other types of cells. A macro cell typically covers a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access to UEs with a service subscription with a network provider. A small cell, such as a pico cell, will typically cover a relatively small geographic area and may allow unrestricted access to UEs with a service subscription with a network provider. A small cell, such as a femto cell, will also typically cover a relatively small geographic area (e.g., a home) and, in addition to unrestricted access, may also provide restricted access to UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG), UEs for users in a home, etc.). A BS for a macro cell may be referred to as a macro BS. A BS for a small cell may be referred to as a small cell BS, a pico BS, a femto BS, or a home BS. In Figure 1 In the example shown, BS 105d and BS 105e may be conventional macro BSs, while BS 105a-105c may be macro BSs that enable one of three-dimensional (3D), full-dimensional (FD), or massive MIMO. BS 105a-105c may utilize their higher-dimensional MIMO capabilities to utilize 3D beamforming in both elevation and azimuth beamforming to increase coverage and capacity. BS 105f may be a small cell BS that may be a home node or a portable access point. BS 105 may support one or more (e.g., two, three, four, etc.) cells.

[0038] The network 100 may support synchronous or asynchronous operation. For synchronous operation, the BSs may have similar frame timing, and transmissions from different BSs may be approximately aligned in time. For asynchronous operation, the BSs may have different frame timing, and transmissions from different BSs may not be aligned in time.

[0039] UE 115 is dispersed throughout the wireless network 100, and each UE 115 can be stationary or mobile. UE 115 can also be referred to as a terminal, a mobile station, a subscriber unit, a station, etc. UE 115 can be a cellular phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a tablet computer, a laptop computer, a cordless phone, a wireless local loop (WLL) station, etc. In one aspect, UE 115 can be a device including a universal integrated circuit card (UICC). On the other hand, UE can be a device that does not include UICC. In some aspects, UE 115 that does not include UICC can also be referred to as an IoT device or an Internet of Everything (IoE) device. UE 115a-115d is an example of a mobile smart phone type device that accesses the network 100. UE 115 can also be a machine that is specifically configured for connecting communications (including machine type communications (MTC), enhanced MTC (eMTC), narrowband IoT (NB-IoT), etc.). UE 115e-115h are examples of various machines configured for communication to access network 100. UE 115i-115k are examples of vehicles equipped with wireless communication devices configured for communication to access network 100. UE 115 may be able to communicate with any type of BS, whether macro BS, small cell, etc. Figure 1 , lightning (e.g., communication link) indicates wireless transmission between UE 115 and serving BS 105, desired transmission between BS 105, backhaul transmission between BSs, or sidelink transmission between UE 115, where serving BS 105 is a BS designated to serve UE 115 on downlink (DL) and / or uplink (UL).

[0040] In operation, BS 105a-105c may use 3D beamforming and coordinated spatial techniques such as coordinated multipoint (CoMP) or multi-connectivity to serve UE 115a and UE 115b. Macro BS 105d may perform backhaul communications with BS 105a-105c and small cell BS 105f. Macro BS 105d may also transmit multicast services that UE 115c and UE 115d subscribe to and are received by them. Such multicast services may include mobile TV or streaming video, or may include other services for providing community information, such as weather emergencies or alerts, such as Amber Alerts or Gray Alerts.

[0041] The BS 105 may also communicate with a core network. The core network may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. At least some of the BSs 105 (e.g., which may be examples of gNBs or access node controllers (ANCs)) may interface with the core network via a backhaul link (e.g., NG-C, NG-U, etc.) and may perform radio configuration and scheduling for communicating with the UE 115. In various examples, the BSs 105 may communicate with each other directly or indirectly (e.g., via a core network) via a backhaul link (e.g., X1, X2, etc.), which may be a wired or wireless communication link.

[0042] The network 100 may also support mission critical communications with ultra-reliable and redundant links for mission critical devices such as UE 115e, which may be a drone. The redundant communication links with UE 115e may include links from macro BS 105d and BS 105e, as well as links from small cell BS 105f. Other machine type devices such as UE 115f (e.g., a thermometer), UE 115g (e.g., a smart meter), and UE 115h (e.g., a wearable device) may communicate directly with BSs such as small cell BS 105f and macro BS 105e through the network 100, or in a multi-step configuration by communicating with another user device that relays its information to the network, such as UE 115f communicating temperature measurement information to a smart meter, which UE 115g then reports to the network through the small cell BS 105f. The network 100 may also provide additional network efficiency through dynamic, low-latency TDD / FDD communications, such as V2V, V2X, C-V2X communications between UE 115i, UE 115j, or UE 115k and other UEs 115, and / or vehicle-to-infrastructure (V2I) communications between UE 115i, UE 115j, or UE 115k and BS 105.

[0043] In some implementations, the network 100 communicates using an OFDM-based waveform. An OFDM-based system can divide the system BW into multiple (K) orthogonal subcarriers, which are also commonly referred to as subcarriers, tones, bins, etc. Each subcarrier can be modulated with data. In some instances, the subcarrier spacing between adjacent subcarriers can be fixed, and the total number of subcarriers (K) can depend on the system BW. The system BW can also be divided into subbands. In other instances, the duration of the TTI and / or the subcarrier spacing can be scalable.

[0044] In some aspects, BS 105 may allocate or schedule transmission resources (e.g., in the form of time-frequency resource blocks (RBs)) for downlink (DL) transmissions and uplink (UL) transmissions in network 100. DL refers to the transmission direction from BS 105 to UE 115, while UL refers to the transmission direction from UE 115 to BS 105. Communication may be in the form of radio frames. A radio frame may be divided into a plurality of subframes or time slots, such as approximately 10 subframes or time slots. Each time slot may be further divided into small time slots. In FDD mode, simultaneous UL and DL transmissions may occur in different frequency bands. For example, each subframe includes a UL subframe in a UL frequency band and a DL subframe in a DL frequency band. In TDD mode, UL and DL transmissions occur in different time periods using the same frequency band. For example, a subset of subframes (e.g., DL subframes) in a radio frame may be used for DL ​​transmissions, and another subset of subframes (e.g., UL subframes) in a radio frame may be used for UL transmissions.

[0045] DL subframes and UL subframes can be further divided into several areas. For example, each DL or UL subframe can have a predefined area for transmitting reference signals, control information and data. Reference signals are predetermined signals that facilitate communication between BS 105 and UE 115. For example, reference signals can have a specific pilot pattern or structure, where pilot tones can span operating BW or frequency bands, each located at a predefined time and predefined frequency. For example, BS 105 can send a cell-specific reference signal (CRS) and / or a channel state information reference signal (CSI-RS) to enable UE 115 to estimate the DL channel. Similarly, UE 115 can send a sounding reference signal (SRS) to enable BS 105 to estimate the UL channel. Control information may include resource allocation and protocol control. Data may include protocol data and / or operational data. In some aspects, BS 105 and UE 115 can communicate using self-contained subframes. Self-contained subframes may include a portion for DL ​​communication and a portion for UL communication. Self-contained subframes may be DL-centric or UL-centric. A DL-centric subframe may include a longer duration for DL ​​communications than for UL communications. A UL-centric subframe may include a longer duration for UL communications than for DL ​​communications.

[0046] In some aspects, network 100 may be an NR network deployed on a licensed spectrum. BS 105 may send synchronization signals (e.g., including a primary synchronization signal (PSS) and a secondary synchronization signal (SSS)) in network 100 to facilitate synchronization. BS 105 may broadcast system information associated with network 100 (e.g., including a master information block (MIB), remaining minimum system information (RMSI), and other system information (OSI)) to facilitate initial network access. In some instances, BS 105 may broadcast PSS, SSS, and / or MIB in the form of a synchronization signal block (SSB) on a physical broadcast channel (PBCH), and may broadcast RMSI and / or OSI on a physical downlink shared channel (PDSCH).

[0047] In some aspects, a UE 115 attempting to access the network 100 may perform an initial cell search by detecting the PSS from the BS 105. The PSS may enable synchronization of periodic timing and may indicate a physical layer identification value. The UE 115 may then receive the SSS. The SSS may enable radio frame synchronization and may provide a cell identification value that may be combined with the physical layer identification value to identify a cell. The PSS and SSS may be located in the center portion of a carrier or any suitable frequency within a carrier.

[0048] After receiving the PSS and SSS, the UE 115 may receive the MIB. The MIB may include system information for initial network access and scheduling information for RMSI and / or OSI. After decoding the MIB, the UE 115 may receive RMSI, OSI, and / or one or more system information blocks (SIBs). The RMSI and / or OSI may include radio resource control (RRC) information related to random access channel (RACH) procedures, paging, control resource sets (CORESET) for physical downlink control channel (PDCCH) monitoring, physical UL control channel (PUCCH), physical UL shared channel (PUSCH), power control, SRS, and cell barring. In some aspects, SIB1 may indicate a PRACH format signal used to send a random access signal.

[0049] After obtaining the MIB, RMSI, and / or OSI, the UE 115 may perform a random access procedure to establish a connection with the BS 105. For the random access procedure, the UE 115 may send a random access preamble, and the BS 105 may respond with a random access response. Upon receiving the random access response, the UE 115 may send a connection request to the BS 105, and the BS 105 may respond with a connection response (e.g., a contention resolution message).

[0050] After the connection is established, the UE 115 and the BS 105 may enter a normal operation phase, in which operational data may be exchanged. For example, the BS 105 may schedule the UE 115 for UL and / or DL ​​communications. The BS 105 may send an UL and / or DL ​​scheduling grant to the UE 115 via the PDCCH. The scheduling grant may be sent in the form of DL control information (DCI). The BS 105 may send a DL communication signal (e.g., carrying data) to the UE 115 via the PDSCH according to the DL scheduling grant. The UE 115 may send an UL communication signal to the BS 105 via the PUSCH and / or PUCCH according to the UL scheduling grant.

[0051] In some aspects, the network 100 may operate on a system BW or a component carrier (CC) BW. The network 100 may divide the system BW into multiple BWPs (e.g., portions). The BS 105 may dynamically allocate the UE 115 to operate on a certain BWP (e.g., a portion of the system BW). The allocated BWP may be referred to as an active BWP. The UE 115 may monitor the active BWP for signaling information from the BS 105. The BS 105 may schedule the UE 115 for UL or DL ​​communication in the active BWP. The UE 115 may monitor the active BWP for signaling information from the BS 105. The BS 105 may schedule the UE 115 for UL or DL ​​communication in the active BWP. In some embodiments, the BS 105 may allocate a BWP pair within a CC to the UE 115 for UL and DL communication. For example, the BWP pair may include one BWP for UL communication and one BWP for DL ​​communication.

[0052] In an embodiment, the network 100 may operate on a shared channel, which may include a shared frequency band or an unlicensed frequency band. For example, the network 100 may be a NR-U network. In order to facilitate network access, the BS 105 may broadcast a PRACH configuration indicating a random access opportunity. The configuration may include a time position, a frequency position, a PRACH preamble format (e.g., a cyclic prefix (CP) length, a preamble sequence root and / or a cyclic shift parameter, a sequence repetition number and / or a gap duration) and any information related to random access preamble generation and / or transmission. A UE 115 that is expected to be connected to the BS 105 may initiate a random access procedure by selecting one of the configured random access opportunities and sending a random access preamble signal to the BS 105. The mechanism for sending and receiving a random access preamble signal is described in more detail herein.

[0053] Figure 2A PRACH preamble signal configuration 200 is shown in accordance with one or more aspects of the present disclosure. The PRACH preamble configuration 200 may be employed by a BS (such as BS 105) and a UE (such as UE 115) in a network (such as network 100). Figure 2 In a graph, the x-axis represents time in some constant units.

[0054] The PRACH preamble signal 201 may be based on the PRACH preamble configuration 200. The UE 115 may send the PRACH preamble signal 201 to the BS 105 via the PRACH channel to obtain network access and / or UL synchronization with the network. The PRACH preamble signal 201 may include a cyclic prefix (CP) 202 followed by one or more instances or repetitions of a PRACH sequence 204. For example, the PRACH sequence 204 may be configured to include a cyclic prefix (CP) 202, followed by one or more instances or repetitions of a PRACH sequence 204. (2) It can be PRACH sequence 204 (1) Therefore, PRACH sequence 204 (1) 204 (2) The symbols may be the same but sent at different times. The symbol may include a CP and a useful part. The useful part may be or include a waveform sequence, data and / or reference signal information. In some examples, the sequence 204 may be a Zadoff-Chu (ZC) sequence, a gold sequence, an m sequence, or any suitable orthogonal sequence, and may include a cyclic shift and / or a root sequence. The PRACH sequence 204 may be, for example, a ZC sequence generated based on a sequence root and a cyclic shift. Some preamble signals may include a guard time (GT) 206 (e.g., a guard interval or a gap interval) at the end of the PRACH preamble signal 201. The GT 206 may be defined within the last RACH preamble along the continuously transmitted RACH preambles.

[0055] BS 105 can configure various PRACH preamble formats, such as short preamble formats and long preamble formats. The differences in the time domain of different preamble formats may include different CP lengths, sequence lengths, GT lengths, and / or numbers of repetitions. In general, the number of OFDM symbols, the number of sequence repetitions, the total sequence length, the duration of the CP, the duration of the GT, and / or the number of OFDM symbols of the PRACH preamble format may vary depending on the deployment of the network. The structure of the PRACH preamble signal and the mechanism for configuring the PRACH preamble signal are described in more detail herein.

[0056] BS 105 may configure various PRACH preamble formats, for example, Figure 3 and Figure 4 shown. Figure 3Various short PRACH format configurations 300 according to one or more aspects of the present disclosure are shown. Configuration 300 may be employed by a BS (such as BS 105) and a UE (such as UE 115) in a network (such as network 100). Specifically, BS 105 may employ configuration 300 to configure a PRACH preamble format to facilitate network access, and UE 115 may send a PRACH preamble signal according to configuration 300 to initiate network access with BS 105.

[0057] exist Figure 3 In the example shown, BS 105 may configure various short PRACH preamble formats, for example, as shown in Table 310. As discussed in the present disclosure, short PRACH preamble format signals may be used in mmWave transmissions. Table 310 includes PRACH preamble format A1, PRACH preamble format A2, PRACH preamble format A3, PRACH preamble format B1, PRACH preamble format B2, PRACH preamble format B3, PRACH preamble format B4, PRACH preamble format C0, and PRACH preamble format C2, which may be similar to the PRACH preamble formats in 3GPP Release 15 for 5G NR TDD frequency range (FR) 2. The number of sequence repetitions, total sequence length, length or duration of CP, length or duration of GT, and number of OFDM symbols for each PRACH preamble format for the 15 kHz parameter set (e.g., SCS = 15, L (sequence length) = 139, N (minimum number of tones to be occupied by the PRACH preamble) = 144, bandwidth = 2.16 MHz, and sequence length of 66.67 microseconds) are shown in columns 312, 314, 316, 318, and 320, respectively.

[0058] Referring to the first entry in Table 310, PRACH preamble format A1 may span a duration of approximately two OFDM symbols, wherein the CP has a length of approximately 9.375 microseconds (μs), followed by approximately two repetitions or instances of a predetermined sequence without any guard or gap intervals. Referring to the fourth entry in Table 310, PRACH preamble format B1 may span a duration of approximately two OFDM symbols, wherein the CP has a length of approximately 7.031 μs, followed by approximately two repetitions or instances of a predetermined sequence, wherein the GT length is approximately 2.344 μs.

[0059] For 30kHz SCS, 60kHz SCS and 120kHz SCS, the preamble format can be scaled according to the SCS. In addition, for data with the same parameter set, the PRACH preamble can be aligned with the OFDM symbol boundary.

[0060] Figure 4Various long PRACH format configurations 400 according to one or more aspects of the present disclosure are shown. Configuration 400 may be employed by a BS (such as BS 105) and a UE (such as UE 115) in a network (such as network 100). Specifically, BS 105 may employ configuration 400 to configure a PRACH preamble format to facilitate network access, and UE 115 may send a PRACH preamble signal according to configuration 400 to initiate network access with BS 105.

[0061] exist Figure 4 In the example shown, the BS may configure various long PRACH preamble formats, for example, as shown in Table 410. As discussed in the present disclosure, the long PRACH preamble format may be used in mmWave transmissions. Table 410 includes PRACH preamble format 0, PRACH preamble format 1, PRACH preamble format 2, and PRACH preamble format 3, which may be similar to the PRACH preamble format in 3GPP Release 15 for 5GNR TDD frequency range (FR) 1. The SCS, bandwidth, number of sequence repetitions, total sequence length, length or duration of CP, and length or duration of GT for each PRACH preamble format with L (sequence length) = 839 and N (minimum number of tones that the PRACH preamble will occupy) = 864 are shown in columns 412, 414, 416, 418, 420, and 422, respectively.

[0062] Referring to the first entry in Table 410, a PRACH preamble format for a 1.25kHz SCS and a 1.08MHz bandwidth may include a CP having a length of approximately 0.103ms, followed by one repetition or instance of a predetermined sequence, wherein the GT length is approximately 0.097ms. Referring to the fourth entry in Table 410, a PRACH preamble format for a 5kHz SCS and a 4.32MHz bandwidth may include a CP having a length of approximately 0.103ms, followed by approximately four repetitions or instances of a predetermined sequence, wherein the GT length is approximately 0.097ms.

[0063] Figure 5 A PRACH format configuration 500 is shown in accordance with one or more aspects of the present disclosure. Configuration 500 may be employed by a BS (such as BS 105) and a UE (such as UE 115) in a network (such as network 100). Specifically, BS 105 may employ configuration 500 to configure a PRACH preamble format to facilitate network access, and UE 115 may send a PRACH preamble signal according to configuration 500 to initiate network access with BS 105.

[0064] BS 105 may configure the UE to use at least one of the PRACH format configurations 500 shown in table 510. Table 510 includes PRACH sequences, and the design of these sequences may follow the same Figure 2 The entries in table 510 may provide a logical mapping to the actual root index to be used for generating the ZC sequence.

[0065] To generate a ZC sequence, UE 115 may substitute the root index and the cyclic shift into the ZC sequence equation. Table 510 includes a column 502 storing a logical root index. BS 105 may configure UE 115 with a logical root index, and UE 115 may use column 502 in table 510 to look up the logical root index to determine the PRACH sequence length. For example, if the logical root index is 1, UE 115 may determine that the actual root index is 570. BS and UE may support and use PRACH format A signals, PRACH format B signals, and PRACH format C signals, and table 510 may support these PRACH formats A, B, and C signals with longer sequences. For example, a single long ZC sequence for a 15kHz SCS may have a sequence length of 1151. In another example, a single long ZC sequence for a 30kHz SCS may have a sequence length of 571. Except for the sequence length, the PRACH design provided in Table 510 may be similar or identical to the PRACH design provided in the short sequence for 5G NR TDD FR 2 provided in 3GPP Release 15.

[0066] It is possible to support in NR Figure 3 , Figure 4 and / or Figure 5 The PRACH format configuration 300, 400 and / or 500 in the network may include an SCS and an OFDM symbol duration. To facilitate random access in the network, the BS may broadcast PRACH preamble format information, for example, in a SIB signal. In some examples, the BS sends SIB1 indicating a configuration of a PRACH format signal for sending a random access signal. The indicated PRACH format signal may be, for example, a short PRACH format signal with a sequence length of 139 (see Figure 2 ), or a long PRACH sequence with a sequence length of 571 or 1151 (see Figure 5 ).

[0067] Figure 6 600 is a block diagram of an example UE 600 according to one or more aspects of the present disclosure. Figure 1, UE 600 may be UE 115. As shown, UE 600 may include a processor 602, a memory 604, a RACH module 608, a transceiver 610 including a modem subsystem 612 and a radio frequency (RF) unit 614, and one or more antennas 616. These elements may communicate with each other directly or indirectly, such as via one or more buses.

[0068] The processor 602 may include a central processing unit (CPU), a digital signal processor (DSP), an application specific integrated circuit (ASIC), a controller, a field programmable gate array (FPGA) device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein. The processor 602 may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a combination of multiple microprocessors, a combination of one or more microprocessors and a DSP core, or any other such configuration.

[0069] Memory 604 may include cache memory (e.g., cache memory of processor 602), random access memory (RAM), magnetoresistive RAM (MRAM), read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), flash memory, solid-state memory devices, hard drives, other forms of volatile and nonvolatile memory, or a combination of different types of memory. In one aspect, memory 604 includes a non-transitory computer-readable medium. Memory 604 may store instructions 606 or have instructions 606 recorded thereon. Instructions 606 may include instructions that, when executed by processor 602, cause processor 602 to perform aspects of the present disclosure described herein (e.g., Figure 1 , 2 , 3, 4, 5, 8, 9, 10, 11, 12 and / or 13) with reference to the operations described by a UE (e.g., UE 115 and / or UE 600). Instructions 606 may also be referred to as program code. The program code may be used to cause the wireless communication device to perform these operations, for example, by causing one or more processors (such as processor 602) to control or command the wireless communication device to do so. The terms "instructions" and "code" should be interpreted broadly to include any type of (multiple) computer-readable statements. For example, the terms "instructions" and "code" may refer to one or more programs, routines, subroutines, functions, processes, etc. "Instructions" and "code" may include a single computer-readable statement or many computer-readable statements.

[0070] The RACH module 608 may be implemented via hardware, software, or a combination thereof. For example, the RACH module 608 may be implemented as a processor, circuit, and / or instructions 606 stored in the memory 604 and executed by the processor 602. In some instances, the RACH module 608 may be integrated into the modem subsystem 612. For example, the RACH module 608 may be implemented by a combination of software components (e.g., executed by a DSP or general purpose processor) and hardware components (e.g., logic gates and circuits) within the modem subsystem 612.

[0071] The RACH module 608 may be used in various aspects of the present disclosure, for example, Figure 1 , 2 , 3, 4, 5, 8, 9, 10, 11, 12 and / or 13. In some aspects, the RACH module 608 may be configured to communicate with the BS to transmit a random access signal in a frequency band, the random access signal including at least one of a time length or a frequency length based on the SCS in the frequency band. The RACH module 608 may also be configured to communicate with the BS to transmit a random access response in response to the random access signal. For example, the RACH module 608 may send a PRACH preamble signal in a frequency band to the BS, the PRACH preamble signal including at least one of a time length or a frequency length based on the SCS in the frequency band. The RACH module 608 may receive a random access response from the BS in response to the PRACH preamble signal.

[0072] As shown, the transceiver 610 may include a modem subsystem 612 and an RF unit 614. The transceiver 610 may be configured to communicate bidirectionally with other devices such as the BS 105 and / or another core network element. The modem subsystem 612 may be configured to modulate and / or encode data from the memory 604 and / or the RACH module 608 according to a modulation and coding scheme (MCS) (e.g., a low-density parity check (LDPC) coding scheme, a turbo coding scheme, a convolutional decoding scheme, a polar decoding scheme, a digital beamforming scheme, etc.). The RF unit 614 may be configured to process (e.g., perform analog-to-digital conversion or digital-to-analog conversion, etc.) the modulated / encoded data (e.g., random access signal, random access response, CP, PRACH sequence, GT, SCS, number of repetitions or instances of a short PRACH format signal, number of repetitions or instances of a long PRACH format signal, bandwidth, etc.) from the modem subsystem 612 (on outbound transmissions) or from another source such as the UE 115 or the BS 105. The RF unit 614 may also be configured to perform analog beamforming in conjunction with digital beamforming.Although shown as integrated together in the transceiver 610, the modem subsystem 612 and the RF unit 614 may be separate devices coupled together at the UE 115 to enable the UE 115 to communicate with other devices.

[0073] The RF unit 614 can provide modulated and / or processed data (e.g., data packets, or more generally, data messages that can contain one or more data packets and other information) to the antenna 616 for transmission to one or more other devices. The antenna 616 can also receive data messages sent from other devices. The antenna 616 can provide received data messages for processing and / or demodulation at the transceiver 610. The transceiver 610 can provide demodulated and decoded data (e.g., random access signals, random access responses, CPs, PRACH sequences, GTs, SCSs, repetitions or instances of short PRACH format signals, repetitions or instances of long PRACH format signals, bandwidths, etc.) to the RACH module 608 for processing. The antenna 616 can include multiple antennas of similar or different designs to maintain multiple transmission links. The RF unit 614 can configure the antenna 616.

[0074] In one aspect, the transceiver 610 may coordinate with the RACH module 608 to send a random access signal in a frequency band to the BS and receive a random access response in response to the random access signal from the BS. In one aspect, the UE 600 may include multiple transceivers 610 that implement different RATs (e.g., NR and LTE). In one aspect, the UE 600 may include a single transceiver 610 that implements multiple RATs (e.g., NR and LTE). In one aspect, the transceiver 610 may include various components, where different combinations of components may implement different RATs.

[0075] Figure 7 is a block diagram of an example BS 700 according to one or more aspects of the present disclosure. BS 700 may be BS 105, as described above in Figure 1 As shown, BS 700 may include a processor 702, a memory 704, a RACH module 708, a transceiver 710 including a modem subsystem 712 and an RF unit 714, and one or more antennas 716. These elements may communicate with each other directly or indirectly, such as via one or more buses.

[0076] The processor 702 may have various characteristics as a particular type of processor. For example, these may include a CPU, a DSP, an ASIC, a controller, an FPGA device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein. The processor 702 may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a combination of multiple microprocessors, a combination of one or more microprocessors and a DSP core, or any other such configuration.

[0077] Memory 704 may include cache memory (e.g., cache memory of processor 702), RAM, MRAM, ROM, PROM, EPROM, EEPROM, flash memory, solid-state memory devices, one or more hard disk drives, memristor-based arrays, other forms of volatile and non-volatile memory, or a combination of different types of memory. In some aspects, memory 704 may include non-transitory computer-readable media. Memory 704 may store instructions 706. Instructions 706 may include instructions that, when executed by processor 702, cause processor 702 to perform aspects described herein in conjunction with the present disclosure (e.g., Figure 1 , 2 , 3, 4, 5, 8, 9, 10, 11, 12 and / or 13) with reference to the operations described by the BS (e.g., BS 105 and / or BS 700). Instruction 706 may also be referred to as code, which may be broadly interpreted as including the above-mentioned Figure 6 Any type of computer-readable statement(s) in question.

[0078] The RACH module 708 may be implemented via hardware, software, or a combination thereof. For example, the RACH module 708 may be implemented as a processor, circuit, and / or instructions 706 stored in the memory 704 and executed by the processor 702. In some instances, the RACH module 708 may be integrated into the modem subsystem 712. For example, the RACH module 708 may be implemented by a combination of software components (e.g., executed by a DSP or general purpose processor) and hardware components (e.g., logic gates and circuits) within the modem subsystem 712.

[0079] The RACH module 708 may be used in various aspects of the present disclosure, for example, Figure 1 , 2 , 3, 4, 5, 8, 9, 10, 11, 12 and / or 13. In some aspects, the RACH module 708 may be configured to communicate with the UE a random access signal in a frequency band, the random access signal including at least one of a time length or a frequency length based on the SCS in the frequency band. The RACH module 708 may also be configured to communicate with the UE a random access response in response to the random access signal. For example, the RACH module 708 may receive a PRACH preamble signal in a frequency band from the UE, the PRACH preamble signal including at least one of a time length or a frequency length based on the SCS in the frequency band. The RACH module 708 may receive a random access response in response to the PRACH preamble signal from the UE.

[0080] As shown, the transceiver 710 may include a modem subsystem 712 and an RF unit 714. The transceiver 710 may be configured to communicate bidirectionally with other devices such as the UE 115 and / or another core network element. The modem subsystem 712 may be configured to modulate and / or encode data according to an MCS (e.g., an LDPC decoding scheme, a turbo decoding scheme, a convolutional decoding scheme, a polar decoding scheme, a digital beamforming scheme, etc.). The RF unit 714 may be configured to process (e.g., perform analog-to-digital conversion or digital-to-analog conversion, etc.) modulated / encoded data (e.g., random access signals, random access responses, CPs, PRACH sequences, GTs, SCSs, the number of repetitions or instances of short PRACH format signals, the number of repetitions or instances of long PRACH format signals, bandwidths, etc.) from the modem subsystem 712 (on outbound transmissions) or from another source such as the UE 115 or the BS 105. The RF unit 714 may also be configured to perform analog beamforming in conjunction with digital beamforming. Although shown as being integrated together in transceiver 710, modem subsystem 712 and / or RF unit 714 may be separate devices that are coupled together at BS 105 to enable BS 105 to communicate with other devices.

[0081] The RF unit 714 may provide modulated and / or processed data (e.g., data packets, or more generally, data messages that may include one or more data packets and other information) to the antenna 716 for transmission to one or more other devices. According to some aspects of the present disclosure, this may include, for example, transmitting information to complete attachment to a network and communication with a resident UE 115 or UE 600. The antenna 716 may also receive data messages sent from other devices and provide received data messages for processing and / or demodulation at the transceiver 710. The transceiver 710 may provide demodulated and decoded data (e.g., random access signals, random access responses, CPs, PRACH sequences, GTs, SCSs, repetitions or instances of short PRACH format signals, repetitions or instances of long PRACH format signals, bandwidths, etc.) to the RACH module 708 for processing. The antenna 716 may include multiple antennas of similar or different designs in order to maintain multiple transmission links.

[0082] In one aspect, the transceiver 710 may coordinate with the RACH module 708 to receive a random access signal in a frequency band from a UE and send a random access response to the UE in response to the random access signal. In one aspect, the BS 700 may include multiple transceivers 710 that implement different RATs (e.g., NR and LTE). In one aspect, the BS 700 may include a single transceiver 710 that implements multiple RATs (e.g., NR and LTE). In one aspect, the transceiver 710 may include various components, where different combinations of components may implement different RATs.

[0083] The present disclosure provides a mechanism for PRACH design in millimeter waves. For example, if UE 115 transmits a random access signal in a high frequency band (e.g., greater than 52.6 GHz) such as a millimeter wave band, a larger SCS (e.g., at least 120 kHz) may result in a shorter duration of the symbol. The SCS and the symbol duration of the random access preamble signal are inversely related. The larger the SCS, the reduced PRACH coverage. For example, if the UE uses an SCS of 120 kHz and an SCS of 960 kHz for transmission of the random access preamble signal, a difference of up to 10 decibels (dB) in PRACH coverage can be expected.

[0084] It may be beneficial to treat the PRACH with a matching parameter set as data to facilitate processing by BS 105. For example, to compensate for coverage due to a shorter symbol duration with a larger PRACH SCS, UE 115 may send a single PRACH format signal that includes multiple repetitions of a short PRACH format signal in time. UE 115 may repeat each short PRACH format signal in time to compensate for the loss in coverage. In some examples, UE 115 may repeat the short PRACH format signal with scaling parameters (e.g., as Figure 2 15kHz parameter set shown in ) are aggregated into a single PRACH format signal that is longer than the initial short PRACH format signal. The reuse of the short PRACH format signal can allow reuse of the current PRACH format and provide sufficient signal coverage and / or random access performance. In some examples, UE 115 can send multiple repetitions of the short PRACH format signal with scaling parameters based on the spreading code.

[0085] Figure 8 A random access signal configuration 800 including multiple repetitions of a PRACH sequence in time according to one or more aspects of the present disclosure is shown. Configuration 800 may be employed by a BS (such as BS 105) and a UE (such as UE 115) in a network (such as network 100). Specifically, BS 105 may employ configuration 800 to configure a PRACH format signal to facilitate network access. Figure 8 In a graph, the x-axis represents time in some constant units.

[0086] exist Figure 8 In the example shown, UE 115 may transmit a single PRACH format signal 810 that includes multiple repetitions of a short PRACH format signal 801 with a scaling parameter set. The short PRACH format signal 801 may correspond to Figure 2 PRACH preamble signal and / or Figure 3 The PRACH format shown in Table 310 of FIG. 801 includes a CP 802 followed by one or more PRACH sequences 804 with or without a GT 806. Return to Reference Figure 3, if the short PRACH format signal 801 is a PRACH format A signal, the short PRACH format signal 801 will not have a GT 806. In this case, each of the multiple repetitions may include a CP 802 and one or more PRACH sequences 804 (without a GT 806). If the short PRACH format signal 801 is a PRACH format B signal or a PRACH format C signal, the short PRACH format signal 801 will have a GT 806. In this case, each of the multiple repetitions may include a CP 802, one or more PRACH sequences 804, and a GT 806. In some examples, the SCS in the frequency band is at least 120 kHz (e.g., 120 kHz, 960 kHz, etc.).

[0087] UE 115 may transmit a single PRACH format signal 810 in a frequency band, wherein the single PRACH format signal 810 includes a time length based on the SCS in the frequency band. The single PRACH format signal 810 is longer than the short PRACH format signal 801 and includes multiple repetitions of the short PRACH format signal 801 during the time length. Although the single PRACH format signal 810 is shown as including four repetitions of the single PRACH format signal 810, this is not intended to be limiting, and other examples of a single PRACH format signal transmitted by UE 115 to BS 105 may include less than or more than four repetitions. The number of repetitions may vary depending on the PRACH format, symbol duration, and / or signal coverage requirements.

[0088] In some aspects, a single PRACH format signal 810 may include an aggregation of multiple repetitions of a short PRACH format signal 801 with a scaling parameter set. For example, the UE 115 may aggregate multiple repetitions of the short PRACH format signal 801 into a single PRACH format signal 810, and may repeat each short PRACH format signal in time to compensate for loss in coverage.

[0089] In some aspects, a single PRACH format signal 810 may include multiple repetitions of a short PRACH format signal 801 with a scaling parameter set based on a spreading code. The UE 115 may spread the multiple repetitions of the short PRACH format signal 801 over time by repeating the short PRACH format signal 801 in time and applying the spreading code to the multiple repetitions. For example, the spreading code may be [1, 1, 1, 1], and the UE 115 may apply the spreading code to the short PRACH format signal 801, respectively. (1) , short PRACH format signal 801 (2) , short PRACH format signal 801 (3) and short PRACH format signal 801 (4)In this example, UE 115 may transmit short PRACH format signal 801 (1) Multiply by 1 and convert the short PRACH format signal 801 (2) Multiply by 1 and convert the short PRACH format signal 801 (3) Multiply by 1 and convert the short PRACH format signal 801 (4) In another example, the spreading code may be [1, -1, 1, -1], and the UE 115 may apply the spreading code to the short PRACH format signal 801, (1) , short PRACH format signal 801 (2) , short PRACH format signal 801 (3) and short PRACH format signal 801 (4) In this example, UE 115 may transmit short PRACH format signal 801 (1) Multiply by 1 and convert the short PRACH format signal 801 (2) Multiply by (-1) to convert the short PRACH format signal 801 (3) Multiply by 1 and convert the short PRACH format signal 801 (4) Multiply by (-1).

[0090] Spreading using spreading codes can allow two UEs to send the same signal PRACH format signal 810 (e.g., four repetitions of short PRACH format signal 801) using the same resources, but applying different spreading codes (e.g., orthogonal to each other). Therefore, BS 105 can distinguish between two single PRACH format signals sent by two different UEs.

[0091] It should be understood that the UE 115 can apply aggregation and / or extension to multiple repetitions of the short PRACH format signal 801 (e.g., a PRACH format A signal, a PRACH format B signal, or a PRACH format C signal). For example, the UE 115 can further apply extension on top of the aggregation of multiple repetitions of the short PRACH format signal 801.

[0092] In some other aspects, BS 105 may configure a PRACH format signal with a larger SCS to compensate for PRACH coverage, where the PRACH format signal spans more than one time slot. In some examples, the larger SCS is an SCS in a frequency band of at least 120kHz (e.g., 120kHz, 960kHz, etc.). If a PRACH format signal (e.g., a single PRACH format signal 810) occupies multiple consecutive time slots, the PRACH format signal may block DL transmissions during the entire duration of the PRACH format signal, thereby potentially reducing spectrum utilization efficiency. To overcome this problem, for PRACH format signals that exceed one time slot, BS 105 may configure a PRACH format signal that includes a long PRACH sequence, where the long PRACH sequence includes a gap (e.g., one or more symbols). The gap may allow DL transmissions and / or other transmissions to be sent and / or received.

[0093] Fig. 9 A random access signal configuration 900 including gaps according to one or more aspects of the present disclosure is shown. Configuration 900 may be employed by a BS (such as BS 105) and a UE (such as UE 115) in a network (such as network 100). Specifically, BS 105 may employ configuration 900 to configure a PRACH format signal to facilitate network access. Fig. 9 In a graph, the x-axis represents time in some constant units.

[0094] exist Fig. 9 In the example shown, the PRACH format signal 901 includes a CP 902 followed by a long PRACH sequence 904 with or without a GT 906. The long PRACH sequence 904 may be a ZC sequence with a long sequence length. The sequence length may vary depending on the SCS, symbol duration, and / or target PRACH coverage. An example of a long sequence length may include a sequence with an SCS of 960 kHz, where format B4 (see Figure 3 ) is modified to have 48 sequences instead of 12 sequences. Another example of a long sequence length may include a format A3 (see Figure 3 ), format A3 is modified to have 24 sequences instead of 6 sequences. As further discussed in the present disclosure, gaps may be inserted between sequences to allow BS 105 to make DL transmissions. Long PRACH sequence 904 spans more than one time slot and includes gap 908. In an example, BS 105 may receive PRACH format signal 901 from a first UE and transmit a DL communication signal to a second UE different from the first UE during gap 908. In another example, BS 105 may receive PRACH format signal 901 from a first UE and receive an UL communication signal from a second UE different from the first UE during gap 908.

[0095] although Figure 8 and Fig. 9 The transmission of PRACH format signals in relation to a larger SCS (e.g., 120kHz SCS, 960kHz SCS, etc.) is discussed, but it should be understood that this is not intended to be limiting, and in other examples, the UE 115 transmits a PRACH format signal using a lower SCS (e.g., no greater than 120kHz). In some examples, higher frequency band operation may also support a lower SCS for PRACH and data. With a lower SCS (e.g., an SCS no greater than 120kHz), PRACH coverage may be better than with a higher SCS (e.g., an SCS of at least 120kHz). However, due to the limited PRACH transmission bandwidth with a smaller SCS, timing resolution may be limited.

[0096] In higher frequency bands (e.g., 60 GHz), the specification may specify a PSD limit (e.g., a PSD limit of approximately 23 dBm / MHz) with up to a threshold equivalent isotropic radiated power (EIRP) (e.g., approximately 40 dBm EIRP). While mobile terminals may operate at approximately 23 dBm, other user terminals (e.g., customer premises equipment (CPE)) may operate at higher EIRP (e.g., up to 40 dBm). For a PRACH with a 120 kHz SCS and a short PRACH sequence of length 139 for PRACH, the total occupied PRACH bandwidth may be approximately 17 MHz. In order to fully utilize the transmit power of UE 115, a transmission bandwidth of approximately 50 MHz may be advantageous to comply with the shorter sequence length of 139. For example, in order for a UE to fully utilize its transmit power and have reasonable PRACH coverage, it may be desirable to use a PRACH other than 139 for the PRACH in the higher frequency bands. Figure 8 and Fig. 9 Another PRACH design besides the one shown in .

[0097] When a smaller SCS is used for transmission of the PRACH preamble, wideband PRACH transmission is advantageous for both timing resolution and power utilization with PSD limitation. In some examples, UE 115 may transmit a single PRACH format signal including multiple repetitions of a short PRACH format signal in frequency, wherein the single PRACH format signal spans a wide bandwidth, such as Fig.10 UE 115 may repeat the short PRACH format signal in the frequency domain to transmit at full transmit power. In some examples, UE 115 may transmit a long PRACH sequence across a wide bandwidth, such as Fig.11 shown.

[0098] Fig.10A random access signal configuration 1000 including multiple repetitions of a PRACH sequence in frequency according to one or more aspects of the present disclosure is shown. Configuration 1000 may be employed by a BS (such as BS 105) and a UE (such as UE 115) in a network (such as network 100). Specifically, BS 105 may employ configuration 1000 to configure a PRACH format signal to facilitate network access. Fig.10 In a graph, the x-axis represents time in some constant units, and the y-axis represents frequency in some constant units.

[0099] UE 115 may transmit a PRACH format signal 1001 in frequency band 1004, the PRACH format signal 1001 including a frequency length based on the SCS in the frequency band. PRACH format signal 1001 may include multiple repetitions of a short PRACH sequence 1002 in the frequency domain 1004 across a wide bandwidth (e.g., frequency length). PRACH format signal 1001 may correspond to Figure 2 PRACH preamble signal and / or Figure 3 Table 310 and / or Figure 5 The PRACH format shown in Table 510 in FIG. 5A . In some examples, the SCS is no greater than 120 kHz. For example, the SCS may be 30 kHz, 60 kHz, 120 kHz, etc.

[0100] Power spectral density (PSD) may refer to a measurement of signal power content versus frequency. For example, PSD may refer to the frequency response of a signal transmitted by UE 115 and may indicate where the average power is distributed as a function of frequency. Constant PSD may refer to the power of a signal being constant. Constant PSD limits may avoid inter-modulation / out-of-band emissions, effectively reducing the amount of adjacent band interference. Additionally, equivalent isotropic radiated power (EIRP) may refer to the product of transmitter power and antenna gain in a given direction relative to an omnidirectional antenna of a radio transmitter. In higher frequency bands (e.g., 60 GHz), the PSD limit is 23 dBm / MHz and the EIRP is as high as 40 dBm. In an example, in order to allow full power transmission with PSD limits, UE 115 may transmit a PRACH format signal 1001 in which the SCS is 120 kHz and the PRACH format signal 1001 includes three repetitions of a short PRACH sequence 1002 occupying a wide bandwidth of 50 MHz. In another example, to allow full power transmission with PSD limitation, the UE 115 may transmit a PRACH format signal 1001 where the SCS is 60 kHz and the PRACH format signal 1001 includes six repetitions of a short PRACH sequence 1002 occupying a wide bandwidth of 50 MHz.

[0101] In addition, a power average peak ratio (PAPR) may refer to the relationship between the maximum power of a sample in a given OFDM transmit symbol divided by the average power of the OFDM symbol. In other words, PAPR may refer to the ratio of the peak power to the average power of a signal. In order to avoid higher PAPR due to frequency domain repetition, each of the multiple repetitions may use a different cyclic shift and / or a different root sequence. In some examples, each of the multiple repetitions included in the PRACH format signal 1001 may include a different cyclic shift. For example, the first repetition of the multiple repetitions included in the PRACH format signal 1001 (e.g., the short PRACH sequence 1002) may include a different cyclic shift. (1) ) may include a first cyclic shift, and a second repetition (eg, short PRACH sequence 1002) among a plurality of repetitions included in the PRACH format signal 1001. (2) ) may include a second cyclic shift different from the first cyclic shift, and so on.

[0102] In some examples, each of the multiple repetitions included in the PRACH format signal 1001 may include a different root sequence. For example, the first repetition (e.g., short PRACH sequence 1002) of the multiple repetitions included in the PRACH format signal 1001 may include a different root sequence. (2) ) may include a first root sequence and may include a second repetition (eg, short PRACH sequence 1002) among a plurality of repetitions in the PRACH format signal 1001. (3) ) may include a second root sequence different from the first root sequence, and so on. Figure 5 As discussed, table 510 provides a logical mapping to an actual root index for a generated ZC sequence. To generate a ZC sequence, UE 115 may substitute the root index and the cyclic shift into the ZC sequence equation. BS 105 may configure UE 115 with a logical root index, and UE 115 may use column 502 in table 510 to look up the logical root index. In some examples, BS 105 may configure UE 115 with different logical root index mapping tables for different sequence lengths, such as Figure 5 Generally, BS 105 may configure UE 115 with PRACH sequence generation parameters in any suitable format.

[0103] In some examples, the short PRACH sequence 1002 may have a sequence length of 139, and the frequency length (e.g., bandwidth) spans or includes 50 MHz. In an example, the SCS is 120 kHz, the PRACH format signal 1001 includes three repetitions of the short PRACH sequence 1002, and the frequency length includes 50 MHz. In another example, the SCS is 60 kHz, the PRACH format signal 1001 includes six repetitions of the short PRACH sequence, and the frequency length includes 50 MHz.

[0104] BS 105 may configure the number of frequency repetitions in the multiple repetitions of the short PRACH sequence 1002 , the number of cyclic shifts in the multiple repetitions of the short PRACH sequence 1002 , and / or the number of root sequence mappings in the multiple repetitions of the short PRACH sequence 1002 .

[0105] Fig.11 A random access signal configuration 1100 including a long PRACH sequence across a wide bandwidth according to one or more aspects of the present disclosure is shown. Configuration 1100 may be employed by a BS (such as BS 115) and a UE (such as UE 115) in a network (such as network 110). Specifically, BS 115 may employ configuration 1100 to configure a PRACH format signal to facilitate network access. Fig.11 In a graph, the x-axis represents time in some constant units, and the y-axis represents frequency in some constant units.

[0106] UE 115 may send a PRACH format signal 1101 in a frequency band 1104, the PRACH format signal 1101 including a frequency length based on an SCS in the frequency band. The PRACH format signal 1101 may include a long PRACH sequence 1102 spanning a wide bandwidth (e.g., frequency length) in the frequency domain 1104. In some examples, the SCS is no greater than 120 kHz. For example, the SCS may be 30 kHz, 60 kHz, 120 kHz, etc. In some examples, the SCS may be 120 kHz, and the long PRACH sequence 1102 may have a frequency length of approximately 50 MHz (e.g., may occupy a bandwidth of approximately 50 MHz) and a sequence length of approximately 409. In some examples, the long PRACH sequence 1102 may include a PRACH preamble with a long sequence length (e.g., 571, 839, or 1151 or another sequence length), and the UE 115 may reuse the corresponding PRACH logical index parameter and zero correlation zone configuration.

[0107] For FR1, 1.25kHz SCS and / or 5kHz SCS may allow a longer sequence of length 839. In addition, 30kHz SCS may allow a longer sequence of length 571, and 15kHz SCS may allow a sequence of length 1151. The PRACH logical index parameter and zero correlation zone configuration are included in Figure 5 In some examples, for mmWave, a 120kHz SCS of length 839, 571, and / or 1151 may be used. The UE may reuse the parameter set after scaling it to 120kHz for high-band operation. Figure 5 The design of these longer sequences.

[0108] Fig.12 1200 is a flow chart of a wireless communication method 1200 according to one or more aspects of the present disclosure. Aspects of method 1200 may be performed by a computing device (e.g., a processor, processing circuitry, and / or other suitable components) of a wireless communication device or other suitable means for performing such blocks. In some examples, a wireless communication device (such as UE 115 and / or UE 600) may utilize one or more components (such as a processor 602, a memory 604, a RACH module 608, a transceiver 610, a modem 612, and one or more antennas 616) to perform blocks of method 1200. In some examples, a wireless communication device (such as BS 105 and / or BS 700) may utilize one or more components (such as a processor 702, a memory 704, a RACH module 708, a transceiver 710, a modem 712, and one or more antennas 716) to perform blocks of method 1200. Method 1200 may be implemented in a manner similar to that described with respect to Figure 1 , 2 , 3, 4, 5, 6, 7, 8, 9, 10 and / or 11. As shown, method 1200 includes multiple enumerated blocks, but aspects of method 1200 may include additional blocks before, after, and between the enumerated blocks. In some aspects, one or more of the enumerated blocks may be omitted or performed in a different order.

[0109] At block 1210, a first wireless communication device (eg, UE 115, UE 600, BS 105, and / or BS 700) determines an SCS in a frequency band.

[0110] At block 1220, the first wireless communication device (e.g., UE 115, UE 600, BS 105, and / or BS 700) determines whether the SCS is greater than a threshold. For example, the threshold may be 120 kHz. In an example, if the SCS is greater than the threshold (e.g., 120 kHz), the process flow may proceed to block 1230. If the SCS is not greater than the threshold, the process flow may proceed to block 1240.

[0111] At block 1230, a first wireless communication device (e.g., UE 115, UE 600, BS 105, and / or BS 700) communicates with a second wireless communication device in a frequency band to transmit a PRACH preamble code, the PRACH preamble code including a time length based on the SCS. The PRACH preamble code including the time length may correspond to, for example, Fig. 9 Configuration in 800 and / or Fig. 9 Configuration 900 in.

[0112] At block 1240, the first wireless communication device (e.g., UE 115, UE 600, BS 105, and / or BS 700) communicates with the second wireless communication device in a frequency band to transmit a PRACH preamble code, the PRACH preamble code including a frequency length based on the SCS. The PRACH preamble code including the frequency length may correspond to, for example Fig.10 Configuration 1000 and / or Fig.11 Configuration 1100 in.

[0113] In some instances, the first wireless communication device is a UE that utilizes one or more components (such as a processor 602, a RACH module 608, a transceiver 610, a modem 612, and one or more antennas 616) to determine an SCS in a frequency band, determine whether the SCS is greater than a threshold, and / or send a PRACH preamble code in the frequency band, the PRACH preamble code including a time length based on the SCS or a frequency length based on the SCS.

[0114] In some instances, the first wireless communication device is a BS that utilizes one or more components (such as a processor 702, a RACH module 708, a transceiver 710, a modem 712, and one or more antennas 716) to determine an SCS in a frequency band, determine whether the SCS is greater than a threshold, and / or receive a PRACH preamble in the frequency band, the PRACH preamble including a time length based on the SCS or a frequency length based on the SCS.

[0115] Fig.131300 is a flow chart of a wireless communication method 1300 according to one or more aspects of the present disclosure. Aspects of method 1300 may be performed by a computing device (e.g., a processor, processing circuitry, and / or other suitable components) of a wireless communication device or other suitable means for performing such blocks. In some examples, a wireless communication device (such as UE 115 and / or UE 600) may utilize one or more components (such as a processor 602, a memory 604, a RACH module 608, a transceiver 610, a modem 612, and one or more antennas 616) to perform blocks of method 1300. In some examples, a wireless communication device (such as BS 105 and / or BS 700) may utilize one or more components (such as a processor 702, a memory 704, a RACH module 708, a transceiver 710, a modem 712, and one or more antennas 716) to perform blocks of method 1300. Method 1300 may be implemented in a manner similar to that described with respect to Figure 1 , 2 , 3, 4, 5, 6, 7, 8, 9, 10 and / or 11. As shown, method 1300 includes multiple enumerated blocks, but aspects of method 1300 may include additional blocks before, after, and between the enumerated blocks. In some aspects, one or more of the enumerated blocks may be omitted or performed in a different order.

[0116] At block 1310, a first wireless communication device (e.g., UE 115, UE 600, BS 105, and / or BS 700) communicates with a second wireless communication device in a frequency band to transmit a random access signal, the random access signal including at least one of a time length or a frequency length based on an SCS in the frequency band. The random access signal may be a PRACH preamble. In some instances, the first wireless communication device is a UE that utilizes one or more components (such as a processor 602, a RACH module 608, a transceiver 610, a modem 612, and one or more antennas 616) to communicate with a BS in a frequency band to transmit a random access signal, the random access signal including at least one of a time length or a frequency length based on an SCS in the frequency band.

[0117] In some examples, the first wireless communication device is a BS that uses one or more components (such as a processor 702, a RACH module 708, a transceiver 710, a modem 712, and one or more antennas 716) to communicate with the UE in a frequency band to transmit a random access signal, the random access signal including at least one of a time length or a frequency length based on the SCS in the frequency band. The UE can send the random access signal in the frequency band, and the BS can receive the random access signal from the UE.

[0118] It should be understood that a single long sequence, a single instance and / or no repetition may be used for time length and / or frequency length.

[0119] In some examples, the SCS is at least 120kHz. In some examples, the UE may send a random access signal including multiple repetitions of a short PRACH format signal during a time length. The BS may receive the random access signal. The UE may send multiple repetitions by communicating an aggregation of multiple repetitions of a short PRACH format signal with a scaling parameter set. The BS may receive the random access signal. The short PRACH format signal may include a PRACH format A signal, a PRACH format B signal, and / or a PRACH format C signal. If the short PRACH format signal is a PRACH format A signal, each of the multiple repetitions may include a CP and a PRACH sequence. If the short PRACH format signal is a PRACH format B signal or a PRACH format C signal, each of the multiple repetitions may include a CP, a PRACH sequence, and a GT.

[0120] In some examples, the UE may send a random access signal including multiple repetitions of a short PRACH format signal having a scaling parameter set and based on a spreading code. The BS may receive the random access signal. In some examples, the UE may send a random access signal including a long PRACH sequence spanning more than one time slot, the long PRACH sequence including a gap. The BS may receive the random access signal.

[0121] In some examples, the UE sends a random access signal in a millimeter wave frequency band by communicating the random access signal in the frequency band.

[0122] In some examples, the SCS is no greater than 120 kHz. In some examples, the UE may send a random access signal comprising multiple repetitions of a short PRACH sequence in the frequency domain spanning a frequency length. In an example, the SCS is 120 kHz, the multiple repetitions comprise three repetitions of the short PRACH sequence, and the frequency length comprises 50 MHz. In another example, the SCS is 60 kHz, the multiple repetitions comprise six repetitions of the short PRACH sequence, and the frequency length comprises 50 MHz.

[0123] In some examples, the UE sends a first cyclic shift in a first repetition of the plurality of repetitions and sends a second cyclic shift in a second repetition of the plurality of repetitions, the first cyclic shift being different from the second cyclic shift. The BS may receive the first cyclic shift in the first repetition and the second cyclic shift in the second repetition. In some examples, the UE sends a first root sequence in a first repetition of the plurality of repetitions and sends a second root sequence in a second repetition of the plurality of repetitions, the first root sequence being different from the second root sequence. The BS may receive the first root sequence in the first repetition and the second root sequence in the second repetition.

[0124] In some examples, the first wireless communication device is a BS that configures a number of frequency repetitions in multiple repetitions for communicating a random access signal, a number of cyclic shifts in multiple repetitions for communicating a random access signal, and / or a number of root sequence mappings in multiple repetitions for communicating a random access signal.

[0125] In some examples, the UE sends a random access signal including a long PRACH sequence spanning a frequency length in the frequency domain. The BS may receive the random access signal. In the example, the SCS is 120 kHz and the frequency length of the long PRACH sequence is 50 MHz. In some examples, the UE determines the long PRACH sequence using a corresponding PRACH logical index parameter and one or more zero correlation zone configurations. For example, the long PRACH sequence may be 571, 839, or 1151 in length.

[0126] At block 1320, a first wireless communication device (e.g., UE 115, UE 600, BS 105, and / or BS 700) communicates with a second wireless communication device to transmit a random access response in response to a random access signal. In some instances, the first wireless communication device is a UE that communicates with a BS to transmit a random access response in response to a random access signal using one or more components, such as a processor 602, a RACH module 608, a transceiver 610, a modem 612, and one or more antennas 616. In some instances, the first wireless communication device is a BS that communicates with a UE to transmit a random access response in response to a random access signal using one or more components, such as a processor 702, a RACH module 708, a transceiver 710, a modem 712, and one or more antennas 716.

[0127] In some aspects of the present disclosure, a method of wireless communication includes: communicating, by a first wireless communication device and a second wireless communication device, transmitting a random access signal in a frequency band, the random access signal including at least one of a time length or a frequency length based on a subcarrier spacing (SCS) in the frequency band; and communicating, by the first wireless communication device and the second wireless communication device, transmitting a random access response in response to the random access signal.

[0128] In some examples, the SCS is at least 120 kilohertz (kHz). In some cases, the communication transmission random access signal includes communicating multiple repetitions of a short physical random access channel (PRACH) format signal during a time length. In some cases, the communication transmission multiple repetitions include communicating the aggregation of multiple repetitions of a short PRACH format signal with a scaling parameter set. In some examples, the short PRACH format signal includes a PRACH format A signal. In some examples, the short PRACH format signal includes a PRACH format B signal. In some examples, the short PRACH format signal includes a PRACH format C signal. In some examples, each repetition of the multiple repetitions includes a cyclic prefix (CP), a PRACH sequence, and a guard time (GT). In some examples, each repetition of the multiple repetitions includes a CP and a PRACH sequence. In some examples, the communication transmission multiple repetitions includes communicating multiple repetitions of a short PRACH format signal with a scaling parameter set and based on a spreading code. In some examples, the communication transmission random access signal includes communicating a long PRACH sequence spanning more than one time slot, and the long PRACH sequence includes a gap.

[0129] In some examples, the method of wireless communication also includes communicating, by the first wireless communication device and the third wireless communication device, a downlink (DL) communication signal during the gap. In some cases, the SCS is no greater than 120 kHz. In some cases, communicating the random access signal includes communicating multiple repetitions of a short PRACH sequence across a frequency length in the frequency domain. In some examples, the SCS is 120 kHz, and communicating the multiple repetitions includes communicating three repetitions of a short PRACH sequence, where the frequency length includes 50 MHz.

[0130] In some examples, the SCS is 60 kHz, the multiple repetitions of the communication transmission include six repetitions of the communication transmission short PRACH sequence, wherein the frequency length includes 50 MHz. In some examples, the multiple repetitions of the communication transmission include a first cyclic shift in a first repetition of the communication transmission multiple repetitions and a second cyclic shift in a second repetition of the communication transmission multiple repetitions, wherein the first cyclic shift is different from the second cyclic shift. In some examples, the multiple repetitions of the communication transmission include a first root sequence in the first repetition of the communication transmission multiple repetitions and a second root sequence in the second repetition of the communication transmission multiple repetitions, wherein the first root sequence is different from the second root sequence.

[0131] In some cases, the first wireless communication device is a base station (BS), wherein the method further comprises configuring by the BS the number of frequency repetitions in multiple repetitions for communicating a random access signal. In some cases, the first wireless communication device is a BS, wherein the method further comprises configuring by the BS the number of cyclic shifts in multiple repetitions for communicating a random access signal. In some cases, the first wireless communication device is a BS, wherein the method further comprises configuring by the BS the number of root sequence mappings in multiple repetitions for communicating a random access signal. In some examples, the communication transmission random access signal comprises a long PRACH sequence spanning a frequency length in the communication transmission frequency domain. In some cases, the SCS is 120kHz and the frequency length of the long PRACH sequence is 50MHz. In some cases, the communication transmission random access signal comprises determining the long PRACH sequence using a corresponding PRACH logical index parameter and one or more zero correlation zone configurations. In some examples, the length of the long PRACH sequence is 571, 839, or 1151. In some cases, the communication transmission random access signal comprises a communication transmission physical random access channel (PRACH) preamble. In some cases, communicating the random access signal in a frequency band includes communicating the random access signal in a millimeter wave (mmWv) frequency band.

[0132] In some aspects of the present disclosure, an apparatus includes a transceiver configured to: communicate a random access signal by a first wireless communication device and a second wireless communication device in a frequency band, wherein the random access signal includes at least one of a time length or a frequency length based on a subcarrier spacing (SCS) in the frequency band; and communicate a random access response in response to the random access signal by the first wireless communication device and the second wireless communication device.

[0133] In some examples, the SCS is at least 120 kilohertz (kHz). In some cases, the random access signal includes multiple repetitions of a short physical random access channel (PRACH) format signal during the time length. In some examples, the multiple repetitions include an aggregation of multiple repetitions of a short PRACH format signal with a scaling parameter set. In some cases, the short PRACH format signal includes at least one of a PRACH format A signal, a PRACH format B signal, or a PRACH format C signal. In some examples, each repetition in the multiple repetitions includes a cyclic prefix (CP) and a PRACH sequence.

[0134] In some cases, the multiple repetitions include multiple repetitions of a short PRACH format signal having a scaling parameter set and based on an extension code. In some cases, the random access signal includes a long PRACH sequence spanning more than one time slot, and the long PRACH sequence includes a gap, wherein the transceiver is also configured to communicate and transmit a downlink (DL) communication signal by the first wireless communication device and the third wireless communication device during the gap. In some examples, the SCS does not exceed 120kHz. In some cases, the random access signal includes multiple repetitions of a short PRACH sequence spanning a frequency length in the frequency domain. In some examples, the multiple repetitions include a first cyclic shift in a first repetition of the multiple repetitions and a second cyclic shift in a second repetition of the multiple repetitions, wherein the first cyclic shift is different from the second cyclic shift. In some examples, the multiple repetitions include a first root sequence in a first repetition of the multiple repetitions and a second root sequence in a second repetition of the multiple repetitions, wherein the first root sequence is different from the second root sequence.

[0135] In some examples, the first wireless communication device is a base station (BS), wherein the apparatus further includes a processor configured to be configured by the BS for the number of frequency repetitions in a plurality of repetitions. In some examples, the first wireless communication device is a BS, wherein the apparatus further includes a processor configured to be configured by the BS for the number of cyclic shifts in a plurality of repetitions. In some examples, the first wireless communication device is a BS, wherein the apparatus further includes a processor configured to be configured by the BS for the number of root sequence mappings in a plurality of repetitions. In some examples, the random access signal includes a long PRACH sequence in the frequency domain. In some cases, the transceiver is further configured to communicate the random access signal using a corresponding PRACH logical index parameter and one or more zero correlation zone configurations to determine the long PRACH sequence. In some cases, the length of the long PRACH sequence is 571, 839, or 1151.

[0136] In some aspects of the present disclosure, a computer-readable medium having program code recorded thereon includes: code for causing a first wireless communication device to communicate with a second wireless communication device to transmit a random access signal in a frequency band, wherein the random access signal includes at least one of a time length or a frequency length based on a subcarrier spacing (SCS) in the frequency band; and code for causing the first wireless communication device to communicate with the second wireless communication device to transmit a random access response in response to the random access signal. In some examples, the SCS is at least 120 kilohertz (kHz), and the code for causing the first wireless communication device to communicate the random access signal includes code for causing the first wireless communication device to communicate multiple repetitions of a short physical random access channel (PRACH) format signal during the time length. In some cases, the SCS is not greater than 120kHz, and the code for causing the first wireless communication device to communicate the random access signal includes code for causing the first wireless communication device to communicate multiple repetitions of a short PRACH sequence in the frequency domain spanning the frequency length.

[0137] In some aspects of the present disclosure, an apparatus includes: a component for communicating a random access signal in a frequency band with a second wireless communication device, the random access signal including at least one of a time length or a frequency length based on a subcarrier spacing (SCS) in the frequency band; and a component for communicating a random access response in response to the random access signal with the second wireless communication device. In some examples, the component for communicating the random access signal includes a component for communicating a plurality of repetitions of a short physical random access channel (PRACH) format signal during the time length, and wherein the SCS is at least 120 kilohertz (kHz). In some examples, the component for communicating the random access signal includes a component for communicating a plurality of repetitions of a short PRACH sequence in the frequency domain across the frequency length, and wherein the SCS is no greater than 120kHz.

[0138] In some cases, the random access signal includes multiple repetitions of a short PRACH format signal during a time length. In some cases, the multiple repetitions include at least one of an aggregation of multiple repetitions of a short PRACH format signal with a scaling parameter set, or include multiple repetitions of a short PRACH format signal with a scaling parameter set and based on a spreading code. In some instances, the short PRACH format signal includes at least one of a PRACH format A signal, a PRACH format B signal, or a PRACH format C signal. In some cases, the random access signal includes a long PRACH sequence spanning more than one time slot, and the long PRACH sequence includes a gap, and the device also includes a component for transmitting a DL communication signal by the first wireless communication device and the third wireless communication device during the gap. In some cases, the random access signal includes multiple repetitions of a short PRACH sequence spanning a frequency length in the frequency domain. In some cases, the first wireless communication device is a BS, and the device also includes a component for configuring at least one of a first number of frequency repetitions in the multiple repetitions, a second number of cyclic shifts in the multiple repetitions, or a third number of root sequence mappings in the multiple repetitions by the BS. In some cases, the random access signal comprises a long PRACH sequence in the frequency domain.In some cases, the apparatus further comprises means for communicating the random access signal using a corresponding PRACH logical index parameter and one or more zero correlation zone configurations to determine the long PRACH sequence.

[0139] Information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0140] The various illustrative blocks and modules described in conjunction with the disclosure herein may be implemented or executed using a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in an alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in combination with a DSP core, or any other such configuration.

[0141] The functions described herein can be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions can be stored or transmitted as one or more instructions or codes on a computer-readable medium. Other examples and embodiments are within the scope of the present disclosure and the appended claims. For example, due to the nature of software, software, hardware, firmware, hard wiring, or any combination of these executed by a processor can be used to implement the above functions. The features of the implementation functions can also be physically located in various locations, including being distributed so that parts of the functions are implemented at different physical locations. In addition, as used herein, including in the claims, "or" as used in a list of items (e.g., a list of items beginning with phrases such as "at least one" or "one or more") indicates a list of inclusions, such that, for example, 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).

[0142] As will now be understood by those skilled in the art, and depending on the specific application at hand, many modifications, substitutions and changes may be made to the materials, devices, configurations and methods of use of the apparatus of the present disclosure without departing from the spirit and scope of the present disclosure. In view of this, the scope of the present disclosure should not be limited to the scope of the specific embodiments shown and described herein, as they are merely intended as some examples thereof, but should be fully commensurate with the scope of the claims appended hereto and their functional equivalents.

Claims

1. A method of wireless communication performed by a first wireless communication device, the method comprising: Communicating and transmitting a random access signal in a frequency band with a second wireless communication device, the random access signal comprising at least one of a time length or a frequency length, and the communicating and transmitting the random access signal comprises communicating and transmitting based on a subcarrier spacing SCS in the frequency band exceeding an SCS threshold: Multiple repetitions of a short physical random access channel PRACH format signal; or Long PRACH sequences spanning more than one slot; and A random access response is communicated with the second wireless communication device in response to the random access signal.

2. The method of claim 1, wherein the SCS threshold is at least 120 kHz.

3. The method of claim 2, wherein the communicating a random access signal comprises communicating the plurality of repetitions of a short PRACH format signal during the time length.

4. The method according to claim 3, wherein the communicating transmission of the multiple repetitions comprises at least one of: communicating transmission of an aggregation of the multiple repetitions of the short PRACH format signal having a scaling parameter set, or communicating transmission of the multiple repetitions of the short PRACH format signal having the scaling parameter set and based on an extension code.

5. The method of claim 4, wherein the short PRACH format signal comprises at least one of a PRACH format A signal, a PRACH format B signal, or a PRACH format C signal. 6 . The method according to claim 2 , wherein each of the plurality of repetitions comprises a cyclic prefix (CP), a PRACH sequence, and a guard time (GT).

7. The method of claim 2, wherein each of the plurality of repetitions comprises a CP and a PRACH sequence.

8. The method according to claim 2, further comprising: Communicating a downlink (DL) communication signal with a third wireless communication device during a gap, wherein communicating a random access signal comprises communicating the long PRACH sequence spanning the more than one time slot, and wherein the long PRACH sequence comprises the gap.

9. The method of claim 1, wherein the communicating the random access signal comprises communicating multiple repetitions of a short PRACH sequence in the frequency domain spanning the frequency length.

10. The method of claim 9, wherein the SCS is 120 kHz, the communicating multiple repetitions of the short PRACH sequence comprises communicating three repetitions of the short PRACH sequence, and the frequency length comprises 50 megahertz (MHz).

11. The method of claim 9, wherein the SCS is 60 kHz, the communicating multiple repetitions of a short PRACH sequence comprises communicating six repetitions of the short PRACH sequence, and the frequency length comprises 50 MHz.

12. The method of claim 9, wherein the communicating multiple repetitions comprises communicating a first cyclic shift or a first root sequence in a first repetition of multiple repetitions of the short PRACH sequence, and communicating a second cyclic shift or a second root sequence in a second repetition of the multiple repetitions, the first cyclic shift being different from the second cyclic shift, and the first root sequence being different from the second root sequence.

13. The method according to claim 9, wherein the first wireless communication device is a base station BS, the method further comprising: At least one of a first number of frequency repetitions, a second number of cyclic shifts, or a third number of root sequence mappings in the plurality of repetitions is configured by the BS for communicating the random access signal.

14. The method of claim 1, wherein the communicating the random access signal comprises communicating the long PRACH sequence in the frequency domain spanning the frequency length.

15. The method of claim 14, wherein the SCS is 120 kHz and the long PRACH sequence has a frequency length of 50 MHz.

16. The method of claim 14, wherein the communicating a random access signal comprises determining the long PRACH sequence using a corresponding PRACH logical index parameter and one or more zero correlation zone configurations.

17. The method of claim 16, wherein the long PRACH sequence has a length of 571, 839, or 1151.

18. An apparatus comprising: The transceiver is configured as: The second wireless communication device communicates a random access signal in a frequency band, wherein the random access signal includes at least one of a time length or a frequency length, and the transceiver is configured to: communicate based on a subcarrier spacing SCS in the frequency band exceeding an SCS threshold: Multiple repetitions of a short physical random access channel PRACH format signal; or Long PRACH sequences spanning more than one slot; and A random access response is communicated with the second wireless communication device in response to the random access signal.

19. The apparatus of claim 18, wherein the random access signal comprises a plurality of repetitions of the short PRACH format signal during the time length.

20. The apparatus of claim 19, wherein the plurality of repetitions comprises at least one of: an aggregation of the plurality of repetitions of the short PRACH format signal with a scaling parameter set, or a plurality of repetitions of the short PRACH format signal with the scaling parameter set and based on a spreading code.

21. The apparatus of claim 20, wherein the short PRACH format signal comprises at least one of a PRACH format A signal, a PRACH format B signal, or a PRACH format C signal.

22. The apparatus of claim 18, wherein the random access signal comprises the long PRACH sequence spanning the more than one time slots, and the long PRACH sequence comprises gaps, and wherein the transceiver is further configured to communicate a downlink (DL) communication signal to a third wireless communication device during the gaps.

23. The apparatus of claim 18, wherein the random access signal comprises multiple repetitions of a short PRACH sequence in the frequency domain spanning the frequency length.

24. The apparatus according to claim 23, wherein the apparatus comprises a base station BS, the apparatus further comprising: The processor is configured as: At least one of a first number of frequency repetitions in the plurality of repetitions, a second number of cyclic shifts in the plurality of repetitions, or a third number of root sequence mappings in the plurality of repetitions is configured by the BS.

25. The apparatus of claim 23, wherein the random access signal comprises the long PRACH sequence in the frequency domain.

26. The device according to claim 25, wherein The transceiver is configured as: The long PRACH sequence is determined by communicating a random access signal using a corresponding PRACH logical index parameter and one or more zero correlation zone configurations.

27. The apparatus of claim 26, wherein the long PRACH sequence has a length of 571, 839, or 1151.

28. A non-transitory computer readable medium having program code recorded thereon, the program code comprising: Code for causing a first wireless communication device to communicate with a second wireless communication device to transmit a random access signal in a frequency band, wherein the random access signal includes at least one of a time length or a frequency length based on a subcarrier spacing SCS in the frequency band, wherein the code for causing the first wireless communication device to communicate and transmit the random access signal includes: code for causing the first wireless communication device to communicate and transmit multiple repetitions of a short physical random access channel (PRACH) format signal based on the subcarrier spacing (SCS) in the frequency band exceeding an SCS threshold; or a long PRACH sequence spanning more than one time slot; and Code for communicating with the second wireless communication device a random access response in response to the random access signal.

29. The non-transitory computer-readable medium of claim 28, wherein the code for causing the first wireless communication device to communicate a random access signal comprises code for causing the first wireless communication device to communicate a long PRACH sequence in a frequency domain spanning the frequency length, wherein the SCS is 120 kilohertz (kHz), and wherein the long PRACH sequence has a frequency length of 50 megahertz (MHz).

30. The non-transitory computer-readable medium of claim 28, wherein the code for causing the first wireless communication device to communicate a random access signal comprises code for causing the first wireless communication device to communicate a long PRACH sequence in a frequency domain spanning the frequency length, and code for causing the first wireless communication device to determine the long PRACH sequence using a corresponding PRACH logical index parameter and one or more zero correlation zone configurations.

Images