CN114765883A

CN114765883A - User equipment and random access method thereof, and base station and random access method thereof

Info

Publication number: CN114765883A
Application number: CN202110893364.7A
Authority: CN
Inventors: 熊琦; 吴敏; 王轶
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Electronics Co Ltd
Priority date: 2021-01-12
Filing date: 2021-08-04
Publication date: 2022-07-19

Abstract

The application discloses a random access method and device of User Equipment (UE) and a random access method and device of a base station. The random access method of the User Equipment (UE) comprises the following steps: acquiring random access resource configuration information; determining a subcarrier interval of a random access preamble; determining a random access opportunity (RO) according to the random access resource configuration information and the subcarrier interval of the random access preamble; and transmitting the random access preamble on the determined RO.

Description

User equipment and random access method thereof, and base station and random access method thereof

Technical Field

The present application relates to the field of wireless communications technologies, and in particular, to a user equipment and a random access method thereof, and a base station and a random access method thereof.

Background

In order to meet the increasing demand for wireless data communication services since the deployment of 4G communication systems, efforts have been made to develop improved 5G or quasi-5G communication systems. Accordingly, the 5G or quasi-5G communication system is also referred to as a "super 4G network" or a "post-LTE system".

The 5G communication system is implemented in a higher frequency (millimeter wave) band, for example, a 60GHz band, to achieve a higher data rate. In order to reduce propagation loss of radio waves and increase transmission distance, beamforming, massive Multiple Input Multiple Output (MIMO), full-dimensional MIMO (FD-MIMO), array antenna, analog beamforming, massive antenna technology are discussed in the 5G communication system.

Further, in the 5G communication system, development of improvement of a system network is ongoing based on advanced small cells, cloud Radio Access Networks (RANs), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, cooperative communication, coordinated multipoint (CoMP), reception-side interference cancellation, and the like.

In 5G systems, hybrid FSK and QAM modulation (FQAM) and Sliding Window Superposition Coding (SWSC) have been developed as Advanced Coding Modulation (ACM), and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA), and Sparse Code Multiple Access (SCMA) as advanced access techniques.

Disclosure of Invention

Technical problem

A random access scheme applicable to a New Radio (NR) communication system is provided.

Technical scheme

According to an aspect of the present invention, a random access method of a user equipment UE is provided, including: acquiring random access resource configuration information; determining a subcarrier interval of a random access preamble; determining a random access opportunity (RO) according to the random access resource configuration information and the subcarrier interval of the random access preamble; and transmitting the random access preamble on the determined RO.

Determining the subcarrier spacing of the random access preamble may comprise one of: determining a subcarrier spacing of a random access preamble according to an indication of the subcarrier spacing of the random access preamble received via a higher layer signaling or a physical layer message; or determining the subcarrier interval of the random access preamble according to the subcarrier interval size at the frequency position of the UE.

Determining the subcarrier spacing of the random access preamble may include: and if the indication of the subcarrier interval of the random access lead code is not received, determining the subcarrier interval of the random access lead code according to the subcarrier interval size of the frequency position of the UE.

Determining a random access opportunity (RO) according to the random access resource configuration information and the subcarrier spacing of the random access preamble, which may include at least one of: when the determined subcarrier interval of the random access preamble code is the first subcarrier interval, determining corresponding random access resources according to a random access configuration index in random access configuration information, and determining RO according to the random access resources; or when the determined subcarrier spacing of the random access preamble is a second subcarrier spacing, determining that one or more time slot groups of the random access resources exist, and determining configured ROs according to a random access configuration index in the random access configuration information based on the determined one or more time slot groups, wherein the configured ROs in each of the plurality of time slot groups are the same, and wherein the second subcarrier spacing is greater than the first subcarrier spacing.

Determining that one or more groups of slots for which random access resources exist may comprise at least one of: determining one or more time slot groups in which the random access resources exist according to the obtained bitmap indicating the time slot groups in which the random access resources exist; determining one or more time slot groups with random access resources by looking up a table according to the obtained index indication, wherein the index indication is used for indicating the one or more time slot groups with the random access resources; or determining one or more time slot groups with random access resources according to the position of the first time slot group with random access resources, the number of the time slot groups with random access resources, the position relation and the derivation direction among the time slot groups with random access resources.

When the determined subcarrier spacing of the random access preamble is the second subcarrier spacing, determining the RO may include: acquiring an indication of a position of a configured random access resource occupying time period T _ duration in a configured random access resource configuration period T _ duration, determining the position of the T _ duration in the T _ duration according to the acquired indication of the position, and determining the RO according to a random access configuration index in random access configuration information based on the position of the T _ duration in the T _ duration.

Determining the position of the T _ duration in the T _ duration according to the obtained indication of the position, may include: and determining the position of the T _ propagation in the random access resource configuration period according to the configured N _ propagation _ index, wherein the _ propagation _ index is the position index of the T _ propagation in the configured T _ propagation.

Determining the RO may further include determining that the RO is available and/or determining that the RO is valid, wherein determining that the RO is available may include at least one of: determining whether the available RO is an odd-index RO, an even-index RO or every nth RO according to the configured available RO index indication, wherein n is a positive integer; determining available ROs according to a configured bitmap about the available ROs; or determining the available RO according to the configured interval value of the available RO; wherein determining that the RO is valid may include at least one of: determining a valid RO according to the configured valid RO interval value; determining a valid RO by comparing the RO with the configured invalid pattern; or determining the effective RO according to the judgment initial position of the effective RO.

According to an aspect of the present invention, there is provided a random access apparatus of a user equipment UE, including: a transceiver; and a controller configured to control the transceiver to receive the random access resource configuration information; determining a subcarrier interval of a random access preamble; determining a random access opportunity (RO) according to the random access resource configuration information and the subcarrier interval of the random access preamble; and transmitting the random access preamble on the determined RO.

Determining a random access opportunity (RO) according to the random access resource configuration information and the subcarrier spacing of the random access preamble, which may include at least one of: when the determined subcarrier interval of the random access preamble code is the first subcarrier interval, determining corresponding random access resources according to a random access configuration index in random access configuration information, and determining RO according to the random access resources; or when the determined subcarrier spacing of the random access preamble is a second subcarrier spacing, determining that one or more time slot groups of the random access resources exist, and determining configured ROs according to a random access configuration index in the random access configuration information based on the determined one or more time slot groups, wherein the configured ROs in each of the plurality of time slot groups are the same, and wherein the second subcarrier spacing is greater than the first subcarrier spacing. Determining that one or more groups of slots for which random access resources exist may comprise at least one of: determining one or more time slot groups with random access resources according to the obtained bitmap indicating the time slot groups with the random access resources; determining one or more time slot groups with random access resources by looking up a table according to the obtained index indication, wherein the index indication is used for indicating the one or more time slot groups with the random access resources; or determining one or more time slot groups with random access resources according to the position of the first time slot group with random access resources, the number of the time slot groups with random access resources, the position relation and the derivation direction among the time slot groups with random access resources.

Determining a random access opportunity (RO) according to the random access resource configuration information and the subcarrier interval of the random access preamble, and may further include: determining RO of a first subcarrier interval according to the random access resource configuration information; and determining the RO of a second subcarrier spacing corresponding to the RO of the first subcarrier spacing according to the RO of the first subcarrier spacing, wherein the second subcarrier spacing is N times of the first subcarrier spacing.

Determining the RO of the second subcarrier spacing corresponding to the RO of the first subcarrier spacing according to the RO of the first subcarrier spacing may include at least one of: determining RO of the second subcarrier interval is configured in all the RO time lengths of the N second subcarrier intervals corresponding to the RO time length of the first subcarrier interval; and receiving RO configuration sent by the base station, and determining the RO of the second subcarrier interval corresponding to the RO of the first subcarrier interval according to the RO configuration.

Preferably, the RO configuration includes a bitmap of ROs of a second subcarrier spacing corresponding to ROs of a first subcarrier spacing.

Preferably, the RO configuration includes an odd RO index, an even RO index, or every nth RO index. And determining the RO of the second subcarrier interval corresponding to the RO of the first subcarrier interval according to the RO configuration.

Preferably, the RO configuration includes referring to an RO index and/or a number of ROs. Wherein the reference RO index may be an index of a first RO or an index of a last RO. And determining the RO of the second subcarrier interval corresponding to the RO of the first subcarrier interval according to the RO configuration and the default or configured derivation direction.

Determining the position of the T _ duration in the T _ duration according to the obtained indication of the position, which may include: and determining the position of the T _ propagation in the random access resource configuration period according to the configured N _ propagation _ index, wherein the _ propagation _ index is the position index of the T _ propagation in the configured T _ propagation.

According to an aspect of the present invention, there is provided a random access method for a base station, including: and sending the random access configuration information to User Equipment (UE).

The random access method of the base station may further include: an indication of a subcarrier spacing of a random access preamble to a user equipment UE, wherein the random access resource configuration information and the subcarrier spacing of the random access preamble are used by the UE to determine a random access opportunity RO.

According to an aspect of the present invention, there is provided a random access apparatus of a base station, including: the base station includes a transceiver and a controller configured to control the transceiver to transmit random access configuration information to a user equipment UE.

The controller may be further configured to indicate to the user equipment UE a subcarrier spacing of a random access preamble, wherein the random access resource configuration information and the subcarrier spacing of the random access preamble are used by the UE to determine a random access opportunity, RO.

Advantageous effects

The corresponding random access resource is determined by utilizing the subcarrier interval of the random access preamble, so that the performance of random access is improved.

Drawings

The foregoing and/or other aspects will become apparent and more readily appreciated from the following description of the exemplary embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 illustrates an example wireless network 100 in accordance with various embodiments of the present disclosure.

Fig. 2a and 2b illustrate example wireless transmit and receive paths according to the present disclosure.

Fig. 3a and 3b are block diagrams of an example UE and base station, respectively, according to the present disclosure.

Fig. 4 is a diagram of a contention-based random access procedure between a UE and a base station in LTE-a.

Fig. 5 is a flowchart of a random access method of a UE according to an embodiment of the present invention.

Fig. 6 is an exemplary diagram of a random access resource configuration when a PRACH subcarrier spacing is 120khz, according to an embodiment of the present invention.

Fig. 7 is an exemplary diagram of deriving a random access configuration using a bitmap indication according to an embodiment of the present invention.

Fig. 8 is a schematic diagram of a UE according to an embodiment of the present invention.

Fig. 9 is a schematic diagram of a base station according to an embodiment of the present invention.

Fig. 10 is an exemplary diagram of an RO indication method of a second subcarrier spacing.

Fig. 11 is a diagram of an example of SDT preamble configuration.

Detailed Description

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The text and drawings are provided as examples only to assist the reader in understanding the disclosure. They are not intended, nor should they be construed, as limiting the scope of the disclosure in any way. While certain embodiments and examples have been provided, it will be apparent to those skilled in the art, based on the disclosure herein, that changes can be made in the embodiments and examples shown without departing from the scope of the disclosure

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.

It will be understood by those within the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

As will be appreciated by those skilled in the art, a "terminal" as used herein includes both devices having a wireless signal receiver, which are devices having only a wireless signal receiver without transmit capability, and devices having receive and transmit hardware, which have devices having receive and transmit hardware capable of two-way communication over a two-way communication link. Such a device may include: a cellular or other communications device having a single line display or a multi-line display or a cellular or other communications device without a multi-line display; PCS (Personal Communications Service), which may combine voice, data processing, facsimile and/or data communication capabilities; a PDA (Personal Digital Assistant) that may include a radio frequency receiver, a pager, internet/intranet access, web browser, notepad, calendar, and/or GPS (Global Positioning System) receiver; a conventional laptop and/or palmtop computer or other device having and/or including a radio frequency receiver. As used herein, a "terminal" or "terminal device" may be portable, transportable, installed in a vehicle (aeronautical, maritime, and/or land-based), or situated and/or configured to operate locally and/or in a distributed fashion at any other location(s) on earth and/or in space. The "terminal" and "terminal Device" used herein may also be a communication terminal, a Internet access terminal, and a music/video playing terminal, and may be, for example, a PDA, an MID (Mobile Internet Device), and/or a Mobile phone with music/video playing function, and may also be a smart television, a set-top box, and other devices.

The time domain unit (also called time unit) in the application can be an OFDM symbol, an OFDM symbol group (composed of a plurality of OFDM symbols), a time slot group (composed of a plurality of time slots), a subframe group (composed of a plurality of subframes), a system frame and a system frame group (composed of a plurality of system frames); absolute time units are also possible, such as 1 millisecond, 1 second, etc.; the time unit may also be a combination of multiple granularities, e.g., N1 slots plus N2 OFDM symbols.

The frequency domain units in this application may be: one subcarrier, one subcarrier group (consisting of a plurality of subcarriers), one Resource Block (RB), which may also be referred to as Physical Resource Block (PRB), one resource block group (consisting of a plurality of RBs), one band part (BWP), one band part group (consisting of a plurality of BWPs), one band/carrier, one band group/carrier group; or absolute frequency domain units such as 1 Hz, 1 kHz, etc.; the frequency-domain elements may also be a combination of multiple granularities, e.g., M1 PRBs plus M2 subcarriers.

Before Radio Resource Control (RRC) establishment, e.g. in a random access procedure, the performance of random access directly affects the user experience. Since the corresponding OFDM symbol and slot length are shortened as the Sub-Carrier Space (SCS) increases. In this case, how to perform random access is a problem to be solved.

Furthermore, in unlicensed spectrum systems, whether a signal can be transmitted may be related to the result of channel condition detection (e.g., Listen Before Talk (LBT) operation on a channel, i.e., listening to the channel first, transmitting a signal if the channel is idle, and not transmitting a signal if the channel is busy). Therefore, it is desirable to provide a random access method under an unlicensed spectrum system. For example, in a system of unlicensed spectrum, how to configure random access resources, and how to acquire and determine available random access resource configurations by a UE are problems to be solved.

In order to solve at least one of the above problems, the present application provides the following embodiments.

Fig. 1 illustrates an example wireless network 100 in accordance with various embodiments of the present disclosure. The embodiment of the wireless network 100 shown in fig. 1 is for illustration only. Other embodiments of wireless network 100 can be used without departing from the scope of this disclosure.

Wireless network 100 includes a gnnodeb (gNB)101, a gNB102, and a gNB 103. gNB 101 communicates with gNB102 and gNB 103. The gNB 101 also communicates with at least one Internet Protocol (IP) network 130, such as the internet, a proprietary IP network, or other data network.

Depending on the network type, other well-known terms can be used instead of "gnnodeb" or "gNB", such as "base station" or "access point". For convenience, the terms "gnnodeb" and "gNB" are used throughout this patent document to refer to network infrastructure components that provide wireless access for remote terminals instead. Also, other well-known terms, such as "mobile station", "subscriber station", "remote terminal", "wireless terminal", or "user equipment", can be used instead of "user equipment" or "UE", depending on the network type. For convenience, the terms "user equipment" and "UE" are used in this patent document to refer to a remote wireless device that wirelessly accesses the gNB, whether the UE is a mobile device (such as a mobile phone or smartphone) or what is commonly considered a stationary device (such as a desktop computer or vending machine).

gNB102 provides wireless broadband access to network 130 for a first plurality of User Equipments (UEs) within coverage area 120 of gNB 102. The first plurality of UEs comprises: UE 111, which may be located in a Small Enterprise (SB); a UE 112, which may be located in an enterprise (E); UE 113, which may be located in a WiFi Hotspot (HS); a UE 114, which may be located in a first residence (R); a UE 115, which may be located in a second residence (R); the UE 116, may be a mobile device (M) such as a cellular phone, wireless laptop, wireless PDA, etc. gNB 103 provides wireless broadband access to network 130 for a second plurality of UEs within coverage area 125 of gNB 103. The second plurality of UEs includes UE 115 and UE 116. In some embodiments, one or more of the gnbs 101-103 are capable of communicating with each other and with the UEs 111-116 using 5G, Long Term Evolution (LTE), LTE-A, WiMAX, or other advanced wireless communication technologies.

The dashed lines illustrate the approximate extent of

coverage areas

120 and 125, which are shown as approximately circular for purposes of illustration and explanation only. It should be clearly understood that coverage areas associated with the gNB, such as

coverage areas

120 and 125, can have other shapes, including irregular shapes, depending on the configuration of the gNB and variations in the radio environment associated with natural and artificial obstructions.

As described in more detail below, one or more of gNB 101, gNB102, and gNB 103 include a 2D antenna array as described in embodiments of the present disclosure. In some embodiments, one or more of gNB 101, gNB102, and gNB 103 support codebook design and structure for systems with 2D antenna arrays.

Although fig. 1 shows one example of a wireless network 100, various changes can be made to fig. 1. For example, wireless network 100 can include any number of gnbs and any number of UEs in any suitable arrangement. Also, the gNB 101 can communicate directly with any number of UEs and provide those UEs with wireless broadband access to the network 130. Similarly, each gNB 102-103 is capable of communicating directly with network 130 and providing UEs with direct wireless broadband access to network 130. Further, the

gnbs

101, 102, and/or 103 can provide access to other or additional external networks, such as external telephone networks or other types of data networks.

Fig. 2a and 2b illustrate example wireless transmit and receive paths according to this disclosure. In the following description, transmit path 200 can be described as being implemented in a gNB (such as gNB 102), while receive path 250 can be described as being implemented in a UE (such as UE 116). However, it should be understood that the receive path 250 can be implemented in the gNB and the transmit path 200 can be implemented in the UE. In some embodiments, receive path 250 is configured to support codebook design and structure for systems with 2D antenna arrays as described in embodiments of the present disclosure.

The transmit path 200 includes a channel coding and modulation block 205, a serial-to-parallel (S-to-P) block 210, an N-point Inverse Fast Fourier Transform (IFFT) block 215, a parallel-to-serial (P-to-S) block 220, an add cyclic prefix block 225, and an up-converter (UC) 230. Receive path 250 includes a down-converter (DC)255, a remove cyclic prefix block 260, a serial-to-parallel (S-to-P) block 265, an N-point Fast Fourier Transform (FFT) block 270, a parallel-to-serial (P-to-S) block 275, and a channel decode and demodulation block 280.

In transmit path 200, a channel coding and modulation block 205 receives a set of information bits, applies coding, such as Low Density Parity Check (LDPC) coding, and modulates the input bits, such as with Quadrature Phase Shift Keying (QPSK) or Quadrature Amplitude Modulation (QAM), to generate a sequence of frequency domain modulation symbols. A serial-to-parallel (S-to-P) block 210 converts (such as demultiplexes) the serial modulation symbols into parallel data in order to generate N parallel symbol streams, where N is the number of IFFT/FFT points used in the gNB102 and the UE 116. The N-point IFFT block 215 performs an IFFT operation on the N parallel symbol streams to generate a time domain output signal. Parallel-to-serial block 220 converts (such as multiplexes) the parallel time-domain output symbols from N-point IFFT block 215 to generate a serial time-domain signal. Add cyclic prefix block 225 inserts a cyclic prefix into the time domain signal. Upconverter 230 modulates (such as upconverts) the output of add cyclic prefix block 225 to an RF frequency for transmission over a wireless channel. The signal can also be filtered at baseband before being converted to RF frequency.

The RF signal transmitted from gNB102 reaches UE 116 after passing through the radio channel, and the reverse operation to that at gNB102 is performed at UE 116. Downconverter 255 downconverts the received signal to baseband frequency and remove cyclic prefix block 260 removes the cyclic prefix to generate a serial time-domain baseband signal. Serial-to-parallel block 265 converts the time-domain baseband signal to parallel time-domain signals. An N-point FFT block 270 performs an FFT algorithm to generate N parallel frequency domain signals. The parallel-to-serial block 275 converts the parallel frequency domain signals to a sequence of modulated data symbols. Channel decode and demodulation block 280 demodulates and decodes the modulated symbols to recover the original input data stream.

Each of the gnbs 101-103 may implement a transmit path 200 similar to transmitting to the UE 111-116 in the downlink and may implement a receive path 250 similar to receiving from the UE 111-116 in the uplink. Similarly, each of UE 111-116 can implement a transmit path 200 for transmitting in the uplink to gNB 101-103 and can implement a receive path 250 for receiving in the downlink from gNB 101-103.

Each of the components in fig. 2a and 2b can be implemented using hardware only, or using a combination of hardware and software/firmware. As a specific example, at least some of the components in fig. 2a and 2b may be implemented in software, while other components may be implemented in configurable hardware or a mixture of software and configurable hardware. For example, FFT block 270 and IFFT block 215 may be implemented as configurable software algorithms, where the value of the number of points N may be modified depending on the implementation.

Further, although described as using an FFT and IFFT, this is merely illustrative and should not be construed as limiting the scope of the disclosure. Other types of transforms can be used, such as Discrete Fourier Transform (DFT) and Inverse Discrete Fourier Transform (IDFT) functions. It should be understood that the value of the variable N may be any integer (such as 1, 2, 3,4, etc.) for DFT and IDFT functions, and any integer that is a power of 2 (such as 1, 2, 4, 8, 16, etc.) for FFT and IFFT functions.

Although fig. 2a and 2b show examples of wireless transmission and reception paths, various changes may be made to fig. 2a and 2 b. For example, the various components in fig. 2a and 2b can be combined, further subdivided, or omitted, and additional components can be added according to particular needs. Also, fig. 2a and 2b are intended to illustrate examples of the types of transmit and receive paths that can be used in a wireless network. Any other suitable architecture can be used to support wireless communications in a wireless network.

Fig. 3a illustrates an example UE 116 according to the present disclosure. The embodiment of the UE 116 shown in fig. 3a is for illustration only, and the

UE

111 and 115 of fig. 1 can have the same or similar configuration. However, UEs have a wide variety of configurations, and fig. 3a does not limit the scope of the present disclosure to any particular implementation of a UE.

The UE 116 includes an antenna 305, a Radio Frequency (RF) transceiver 310, Transmit (TX) processing circuitry 315, a microphone 320, and Receive (RX) processing circuitry 325. The UE 116 also includes a speaker 330, a processor/controller 340, an input/output (I/O) interface 345, input device(s) 350, a display 355, and a memory 360. Memory 360 includes an Operating System (OS)361 and one or more applications 362.

RF transceiver 310 receives incoming RF signals from antenna 305 that are transmitted by the gNB of wireless network 100. The RF transceiver 310 down-converts an incoming RF signal to generate an Intermediate Frequency (IF) or baseband signal. The IF or baseband signal is sent to RX processing circuitry 325, where RX processing circuitry 325 generates a processed baseband signal by filtering, decoding, and/or digitizing the baseband or IF signal. RX processing circuit 325 sends the processed baseband signals to speaker 330 (such as for voice data) or to processor/controller 340 (such as for web browsing data) for further processing.

TX processing circuitry 315 receives analog or digital voice data from microphone 320 or other outgoing baseband data (such as network data, e-mail, or interactive video game data) from processor/controller 340. TX processing circuitry 315 encodes, multiplexes, and/or digitizes the outgoing baseband data to generate a processed baseband or IF signal. RF transceiver 310 receives the outgoing processed baseband or IF signals from TX processing circuitry 315 and upconverts the baseband or IF signals to RF signals, which are transmitted via antenna 305.

The processor/controller 340 can include one or more processors or other processing devices and executes the OS 361 stored in the memory 360 in order to control overall operation of the UE 116. For example, processor/controller 340 may be capable of controlling the reception of forward channel signals and the transmission of reverse channel signals by RF transceiver 310, RX processing circuitry 325, and TX processing circuitry 315 in accordance with well-known principles. In some embodiments, processor/controller 340 includes at least one microprocessor or microcontroller.

The processor/controller 340 can also execute other processes and programs resident in the memory 360, such as operations for channel quality measurement and reporting for systems having 2D antenna arrays as described in embodiments of the present disclosure. The processor/controller 340 is capable of moving data into and out of the memory 360 as needed to perform a process. In some embodiments, processor/controller 340 is configured to execute applications 362 based on OS 361 or in response to signals received from the gNB or the operator. The processor/controller 340 is also coupled to an I/O interface 345, wherein the I/O interface 345 provides the UE 116 with the ability to connect to other devices, such as laptop computers and handheld computers. I/O interface 345 is the communication path between these accessories and processor/controller 340.

The processor/controller 340 is also coupled to input device(s) 350 and a display 355. The operator of the UE 116 can input data into the UE 116 using the input device(s) 350. Display 355 may be a liquid crystal display or other display capable of presenting text and/or at least limited graphics (such as from a website). A memory 360 is coupled to the processor/controller 340. A portion of memory 360 can include Random Access Memory (RAM) while another portion of memory 360 can include flash memory or other Read Only Memory (ROM).

Although fig. 3a shows one example of the UE 116, various changes can be made to fig. 3 a. For example, the various components in FIG. 3a can be combined, further subdivided, or omitted, and additional components can be added according to particular needs. As a particular example, the processor/controller 340 can be divided into multiple processors, such as one or more Central Processing Units (CPUs) and one or more Graphics Processing Units (GPUs). Also, while fig. 3a shows the UE 116 configured as a mobile phone or smart phone, the UE can be configured to operate as other types of mobile or fixed devices.

Fig. 3b illustrates an example gNB102 according to the present disclosure. The embodiment of the gNB102 shown in fig. 3b is for illustration only, and the other gnbs of fig. 1 can have the same or similar configuration. However, the gNB has a wide variety of configurations, and fig. 3b does not limit the scope of the present disclosure to any particular implementation of the gNB. It should be noted that gNB 101 and gNB 103 can include the same or similar structure as gNB 102.

As shown in fig. 3b, the gNB102 includes multiple antennas 370a-370n, multiple RF transceivers 372a-372n, Transmit (TX) processing circuitry 374, and Receive (RX) processing circuitry 376. In some embodiments, one or more of the plurality of antennas 370a-370n comprises a 2D antenna array. The gNB102 also includes a controller/processor 378, memory 380, and a backhaul or network interface 382.

The RF transceivers 372a-372n receive incoming RF signals, such as signals transmitted by UEs or other gnbs, from the antennas 370a-370 n. RF transceivers 372a-372n down-convert the incoming RF signals to generate IF or baseband signals. The IF or baseband signal is sent to RX processing circuitry 376, where RX processing circuitry 376 generates a processed baseband signal by filtering, decoding, and/or digitizing the baseband or IF signal. The RX processing circuit 376 sends the processed baseband signals to the controller/processor 378 for further processing.

TX processing circuitry 374 receives analog or digital data (such as voice data, network data, e-mail, or interactive video game data) from controller/processor 378. TX processing circuitry 374 encodes, multiplexes, and/or digitizes the outgoing baseband data to generate a processed baseband or IF signal. RF transceivers 372a-372n receive outgoing processed baseband or IF signals from TX processing circuitry 374 and upconvert the baseband or IF signals into RF signals for transmission via antennas 370a-370 n.

Controller/processor 378 can include one or more processors or other processing devices that control the overall operation of gNB 102. For example, the controller/processor 378 can control the reception of forward channel signals and the transmission of reverse channel signals through the RF transceivers 372a-372n, RX processing circuitry 376, and TX processing circuitry 374 according to well-known principles. The controller/processor 378 can also support additional functions, such as higher-level wireless communication functions. For example, the controller/processor 378 can perform a Blind Interference Sensing (BIS) process, such as by performing a BIS algorithm, and decode the received signal with the interference signal subtracted. Controller/processor 378 may support any of a wide variety of other functions in the gNB 102. In some embodiments, controller/processor 378 includes at least one microprocessor or microcontroller.

Controller/processor 378 is also capable of executing programs and other processes resident in memory 380, such as a base OS. The controller/processor 378 can also support channel quality measurement and reporting for systems with 2D antenna arrays as described in embodiments of the present disclosure. In some embodiments, controller/processor 378 supports communication between entities such as a web RTC. Controller/processor 378 can move data into and out of memory 380 as needed to perform a process.

Controller/processor 378 is also coupled to a backhaul or network interface 382. Backhaul or network interface 382 allows gNB102 to communicate with other devices or systems over a backhaul connection or over a network. Backhaul or network interface 382 can support communication via any suitable wired or wireless connection(s). For example, when the gNB102 is implemented as part of a cellular communication system (such as one supporting 5G or new radio access technologies or NR, LTE or LTE-a), the backhaul or network interface 382 can allow the gNB102 to communicate with other gnbs over wired or wireless backhaul connections. When gNB102 is implemented as an access point, backhaul or network interface 382 can allow gNB102 to communicate with a larger network (such as the internet) via a wired or wireless local area network or via a wired or wireless connection. Backhaul or network interface 382 includes any suitable structure that supports communication over a wired or wireless connection, such as an ethernet or RF transceiver.

A memory 380 is coupled to the controller/processor 378. A portion of memory 380 can include RAM and another portion of memory 380 can include flash memory or other ROM. In some embodiments, a plurality of instructions, such as a BIS algorithm, are stored in memory. The plurality of instructions are configured to cause the controller/processor 378 to perform a BIS process and decode the received signal after subtracting at least one interfering signal determined by a BIS algorithm.

As described in more detail below, the transmit and receive paths of gNB102 (implemented using RF transceivers 372a-372n, TX processing circuitry 374, and/or RX processing circuitry 376) support aggregated communication with FDD and TDD cells.

Although fig. 3b shows one example of a gNB102, various changes may be made to fig. 3 b. For example, the gNB102 can include any number of each of the components shown in fig. 3 a. As a particular example, the access point can include a number of backhauls or network interfaces 382 and the controller/processor 378 can support routing functions to route data between different network addresses. As another particular example, although shown as including a single instance of TX processing circuitry 374 and a single instance of RX processing circuitry 376, gNB102 can include multiple instances of each (such as one for each RF transceiver).

Fig. 4 is a schematic diagram of a random access procedure between a UE and a base station in LTE/LTE-a.

Transmissions in a wireless communication system include: the transmission from the base station (gNB) to the User Equipment (UE) (referred to as downlink transmission), the corresponding time slot is referred to as downlink time slot, the transmission from the UE to the base station (referred to as uplink transmission), and the corresponding time slot is referred to as uplink time slot.

In downlink communication in a wireless communication system, the system periodically transmits a synchronization signal and a broadcast channel to a user through a Synchronization Signal Block (SSB), which is an SSB period (SSB period) or referred to as an SSB burst period. Meanwhile, the base station configures a Physical Random Access Channel (PRACH) configuration period (configuration period). A certain number of RACH transmission opportunities (ROs), also called random access transmission opportunities or random access opportunities, are configured in this PRACH configuration period, and the following conditions are satisfied: all SSBs can be mapped to corresponding ROs within a mapping association period (certain time length), and SSBs within an SSB-to-RO mapping ring (mapping ring) can be exactly mapped to required random access resources within one SSB period, and one or more mapping rings may be provided within one mapping association period. An SSB-to-RO mapping association pattern period (association pattern period) includes one or more mapping association periods, and the SSB-to-RO mapping patterns in each mapping association pattern period are the same.

In a New Radio (NR) communication system, the performance of random access directly affects the user experience before the Radio resource control is established, for example, in the random access process. In a conventional wireless communication system, such as LTE and LTE-Advanced (LTE-a for short), a Random Access procedure is applied to multiple scenarios, such as establishing an initial connection, cell handover, re-establishing an uplink, and RRC connection re-establishment, and is divided into Contention-based Random Access (Contention-based Random Access) and non-Contention-based Random Access (Contention-free Random Access) according to whether a user has an exclusive preamble resource. Since each user selects a preamble sequence from the same preamble sequence resource in an attempt to establish an uplink in contention-based random access, a situation may occur in which multiple users select the same preamble sequence to transmit to a base station. Therefore, the collision resolution mechanism is an important research direction in random access. In particular, how to reduce the collision probability and how to quickly resolve collisions that have occurred are key indicators affecting the performance of random access.

The contention-based random access procedure in LTE/LTE-a is divided into four steps, as shown in fig. 4. In the first step, the UE randomly selects a preamble sequence from the preamble sequence resource pool to send to the base station. The base station performs correlation detection on the received signal, thereby identifying the preamble sequence transmitted by the UE. In the second step, the base station sends a Random Access Response (RAR) to the UE, which includes a Random Access preamble sequence Identifier, a timing advance command determined according to the time delay estimation between the UE and the base station, a Temporary Cell Radio Network Temporary Identifier (C-RNTI), and a time-frequency resource allocated for the next uplink transmission of the UE. In the third step, the UE sends a third message (Msg3) to the base station according to the information in the RAR. The Msg3 includes UE identity and RRC connection request, wherein the UE identity is unique for the user to resolve the conflict. In the fourth step, the base station sends the conflict resolution identity to the UE, which contains the UE identity that is winning in the conflict resolution. And if the UE detects the identity of the UE, upgrading the temporary C-RNTI into the C-RNTI, sending an ACK signal to the base station, completing the random access process and waiting for scheduling of the base station. Otherwise, the UE will start a new random access procedure after a delay.

For non-contention based random access procedures, since the UE identity is known by the base station, the UE may be assigned a preamble sequence. Therefore, when the UE transmits the preamble sequence, the UE does not need to randomly select the sequence, but uses the preamble sequence allocated thereto by the base station. After detecting the allocated preamble sequence, the base station sends a corresponding random access response, which includes information such as timing advance and uplink resource allocation. And after receiving the random access response, the user determines that the uplink synchronization is finished, and then waits for further scheduling of the base station. Thus, the non-contention based random access procedure only comprises two steps: performing transmission of a preamble sequence in step one; in step two, the sending of the random access response is performed.

The random access procedure in LTE/LTE-a is applicable to the following scenarios:

initial access in RRC _ IDLE state;

2. re-establishing the RRC connection;

3. cell switching;

downlink data arrives and requests a random access process in an RRC connected state (the downlink is in synchronization);

5, uplink data arrives and requests a random access process in an RRC connection state (when the uplink is in asynchronous or the uplink is not allocated to a resource of a scheduling request in PUCCH resources);

6. and (6) positioning.

In systems employing higher subcarrier spacing (e.g., in systems with high frequency bands greater than 52.6 GHz), the corresponding OFDM symbol and slot length are shortened due to the increased subcarrier spacing (SCS). In this case, how to obtain the configuration information of the random access resource is a problem to be solved.

Furthermore, in unlicensed spectrum systems, whether a signal can be transmitted may be related to the result of channel condition detection (e.g., Listen Before Talk (LBT) operation on a channel, i.e., listening to the channel first, transmitting a signal if the channel is idle, and not transmitting a signal if the channel is busy). Therefore, how to configure the random access resource, and how to acquire and determine the available random access resource configuration by the UE are problems to be solved.

The invention provides a random access method suitable for the condition of using a higher PRACH subcarrier interval.

The UE acquires random access resource configuration information in step 501, determines a subcarrier spacing of a random access preamble in step 502, determines a random access opportunity RO according to the random access resource configuration information and the subcarrier spacing of the random access preamble in step 503, and transmits the random access preamble on the determined RO in step 504.

Fig. 6 is an exemplary diagram illustrating a random access resource configuration when a PRACH subcarrier spacing is 120khz according to an embodiment of the present invention. Fig. 7 is a diagram of an example of obtaining a random access configuration using a bitmap indication. A random access resource configuration method according to an embodiment of the present invention will be described below with further reference to fig. 6 and 7.

In some communication systems, a first subcarrier spacing (e.g., 60Khz or 120Khz) may be used in a communication system operating in a low frequency band, and a second subcarrier spacing (e.g., 240Khz, 480Khz, and 960Khz) may be used in addition to the first subcarrier spacing in a communication system operating in a high frequency band, when the length of a corresponding time unit (e.g., OFDM symbol, slot) is correspondingly shortened. For example, when the subcarrier spacing is 15khz, the length of one slot is 1ms, and when the subcarrier spacing is 120khz, the length of one slot is 0.125 ms. Therefore, when the sub-carrier reaches 960Khz, the length of one slot is only 0.015625 ms. In this case, how to configure the random access resource is a problem to be solved. The present invention provides a random access resource (RACH resource) configuration method which can be more suitable for the situation of using the second subcarrier interval.

If a second subcarrier spacing, for example, 480khz, 960khz (these two values are used as an example of the second subcarrier spacing value in the present invention, and are not limited to these two values in practice), the lengths of the corresponding OFDM symbols are 1/4 and 1/8 of the length of the OFDM symbol corresponding to the subcarrier spacing of 120khz, respectively; the configuration related to random access (also referred to as random access configuration or random access resource configuration) that the UE may obtain includes at least one of:

● subcarrier spacing indication of the random access preamble. The UE may determine the subcarrier spacing size of the random access preamble based on the indication. The specific indication mode can be at least one of the following modes:

directly indicate the subcarrier spacing size of the random access preamble (e.g., through higher layer signaling (e.g., system messages), or through physical layer information such as DCI); for example, 2 bits indicate: 00 for 120khz, 01 for 480khz, 10 for 960khz, 11 empty; or only 1 bit, 0 for either 480khz or 960 khz. Preferably, redefining the existing subcarrier spacing indication bit, e.g., the indication of message 1 subcarrier spacing msg 1-subcarrierspaceing is redefined in such a way that msg 1-subcarrierspaceing indicates 15khz or 30khz at frequency bin 1(frequency range 1, FR1), msg 1-subcarrierspaceing indicates 60khz or 120khz at frequency bin 2; in the frequency interval 3 (or 4), msg 1-Subcarrirspacing indicates 120khz or 480khz (or 120khz or 960 khz; or 960khz or 480 khz). Preferably, when the subcarrier spacing indication of the random access preamble is not configured, the UE determines that the subcarrier spacing of the random access preamble is 120 khz;

the subcarrier spacing size of the random access preamble is indicated according to the subcarrier spacing size (larger or smaller in uplink or downlink or uplink and downlink) at the frequency location where the UE is located (e.g., at the BWP), or at the carrier where the UE is located, etc. For example, if the current BWP is the initial access BWP and the uplink SCS on the initial access BWP is 120Khz, the UE determines that the subcarrier spacing of the random access preamble is also 120 Khz;

preferably, when the direct indication is not configured, the UE determines the subcarrier spacing of the random access preamble according to the subcarrier spacing size at the frequency location where the UE is located (e.g. at BWP, or at the carrier, etc.);

● random access opportunity (RACH occasion, RO), where the RO has the same meaning as the RO pattern (ROpattern), the specific configuration of the RO may be at least one of the following:

when the determined subcarrier spacing of the random access preamble is the first subcarrier spacing (for example, 120khz, or other values, such as 60khz, etc.), the UE obtains the random access configuration when the subcarrier spacing is 120khz according to a table look-up (a random access configuration table corresponding to FR2(Frequency Range 2, Frequency interval 2)) and a corresponding rule by using the obtained random access configuration index (prach-configuration index), which is exemplified in table 1 below. For example, the random access configuration index 3 in table 1 corresponds to a random access configuration when the subcarrier spacing is 120khz, as shown in fig. 6. In this random access configuration, one PRACH frame is 10ms, which includes a total of 80 slots; wherein the slot index configured as a PRACH slot is 8, 9, 18, 19, 28, 29, 38, 39, 48, 49, 58, 59, 68, 69, 78, 79, for a total of 6 ROs in each PRACH slot, starting from the first symbol.

TABLE 1

When the determined subcarrier spacing of the random access preamble is the second subcarrier spacing (e.g., 960khz, which may be another value such as 240khz, 480khz, etc.), the random access configuration of 640 time slots (i.e., N: 960/120: 8, N: 80: 640 time slots in the case of 960khz) may be determined with reference to a random access configuration of 80 time slots (i.e., in the case of 120khz) determined according to the obtained random access configuration index (here, 80 time slots corresponding to 120khz are used as an example, and another reference, e.g., 40 time slots corresponding to 60khz, may also be used). The specific determination mode may be at least one of the following:

■ determining the random access configuration of N time slot groups (i.e. one time slot group represents 80 time slots) by a bitmap (bitmap); for example, N is 8, i.e. there are 8 bits to indicate, e.g. a bit value of 0 represents that there is no random access resource in this timeslot group; 1 represents that there is a random access resource in this slot group (and the configuration of the random access resource is a random access configuration in 80 slots (i.e. in the case of 120khz) determined according to the acquired random access configuration index), for example, the value of the 8-bit map is 01010000, which indicates that there is a random access resource in the second and fourth slot groups, and there is no random access resource in the other slot groups. Preferably, in the N time slot groups, there may be independent indexes within the time slot groups (i.e., within each time slot group, time slots are individually indexed starting from 0); or all the time slots are indexed together, namely, the time slots in the first time slot group are indexed from 0, and the time slots in all the time slot groups are sequentially indexed according to the time sequence; as illustrated in fig. 7.

■ determine the random access configuration of the N time slot groups (i.e., one time slot group represents 80 time slots) by means of a table lookup. A row of a 16-row table is indicated, for example, by 4 bits, where a row of the table represents a combination of time slot groups, as shown in table 2 below. Wherein the number of rows in the table can be changed to more or less (indicated by a larger number of bits, e.g. 5 bits can indicate 32 rows; or indicated by a smaller number of bits, e.g. 3 bits can indicate 8 rows); the specific timeslot group indication in each row may be replaced by reserved (i.e. temporarily without a special indication), or other possible timeslot group or combination of timeslot groups, which are not described in the example table.

TABLE 2 random Access Slot group indication

Index	Allowed time slot group index value (combination)
		0	All time slot groups
1	Slot group index 0
		2	Slot group index 1
3	Slot group index 2
		4	Slot group index 3
5	Slot group index 4
		6	Slot group index 5
7	Slot group index 6
		8	Slot group index 7
9	All even number of time slot groups
		10	All odd number of time slot groups
11	Time slot group 0, 4
		12	Time slot group 1, 5
13	Time slot group 2, 6
		14	Time slot group 3, 7
15	Reservation (reserved)

■, the random access configuration of the N time slot groups is determined according to the position indication (i.e. the index indication of the starting time slot group) of the first time slot group with the random access resource and/or the number indication of the time slot groups with the random access resource and/or the position relation indication (e.g. continuous or with certain interval) of the different time slot groups with the random access resource. For example, if the slot group index of the indicated first slot group with the random access resource is 1, the number of the indicated slot groups with the random access resource is 3, and the positional relationship of the indicated different slot groups with the random access resource is continuous, the UE may determine that the random access resource is configured in the continuous 3 slot groups (i.e., the slot group indexes 1, 2, 3) starting from the slot group index 1. In another example, if the slot group index of the indicated first slot group with random access resources is 1, the number of the indicated slot groups with random access resources is 3, and the positional relationship of the indicated different slot groups with random access resources is 1 slot group apart, the UE may determine that random access resources are configured in the slot groups with slot group indexes of 1, 3, and 5. Preferably, when determining the slot group configured with the random access resource, it can also be reversely deduced from back to front. For example, if the slot group index of the indicated first slot group with the random access resource is 7, the number of the indicated slot groups with the random access resource is 3, and the positional relationship of the indicated different slot groups with the random access resource is continuous, the UE may determine that the random access resource is configured in the 3 reverse continuous slot groups (i.e.,

slot indexes

5,6, 7) starting from the slot group index 7. Preferably, the indication of the position of the first slot group with random access resources and/or the indication of the number of the slot groups with random access resources and/or the indication of the position relationship of the different slot groups with random access resources and/or the indication of the derivation direction (forward or reverse direction) may be explicitly (explicitly) obtained by means of a bit field (in higher layer signaling and/or in DCI configuration) and/or determined by default/predefined rules and/or derived by means of a calculation formula;

preferably, the actual random access configuration may be determined by indicating one or more random access opportunities 960kHz out of 8 possible random access opportunities 960kHz (one 120kHz RO time length corresponding to N960 kHz RO time lengths) for one 120kHz random access opportunity RO (in terms of time length), where 120kHz and 960kHz are merely illustrative of the subcarrier spacing; the specific mode can be at least one of the following modes: default to all 8 random access opportunities being configured ROs, as exemplified in (a) in fig. 10;

obtaining an actually configured RO by an RO specifically configured by a base station, for example, by means of a bitmap, in this example, an 8-bit bitmap, as shown in (b) in fig. 10, 10010010010, where "1" represents an actually configured RO and "0" represents an RO that is not actually configured; in this way, the actually configured RO position can be very flexible, but the occupied signaling overhead is large; preferably, the manner of reducing signaling overhead may also be: the actually configured RO is determined by whether the base station configures an odd RO index value, or an even RO index value, or every nth RO,

determined by the index of the first actually configured RO configured by the base station and/or the number of ROs N _ RO, for example, if the index of the first configured RO is RO3 and N _ RO is 4, then RO3, 4,5,6 is the actually configured RO; preferably, when no number of ROs is configured (i.e., only the index of the first RO actually configured), then the UE uses a default (fixed) number of ROs; preferably, when the index of the first RO of the actual configuration is not configured (i.e. only the number of configured ROs), the UE determines the N _ RO ROs of the corresponding configuration as the RO of the actual configuration from the forward direction (i.e. starting from the first RO) or the reverse direction (i.e. starting from the last RO) according to the default or configured derivation direction; for example, if it is the reverse direction and N _ RO ═ 6, the UE determines that the last six ROs are actually configured ROs, as exemplified in (c) in fig. 10; preferably, the number N _ RO of the ROs may also adopt a default value (when there is no configured value), for example, the default value is N _ RO ═ 4 and is the reverse direction, then the UE takes the last 4 ROs as the actually configured ROs; preferably, a table look-up similar to table 2 may be used to indicate that the slot group index in table 2 is replaced by an RO index;

the configuration of obtaining the actual 960khz RO corresponding to one 120khz RO in the above manner is applied to all other 120khz ROs to obtain the corresponding 960khz RO, i.e. the actual 960khz RO configuration corresponding to each 120khz RO is the same.

When the determined subcarrier spacing of the random access preamble is the second subcarrier spacing (e.g., 960khz, but may also be other values such as 240khz, 480khz, etc.), the random access configuration of 80 slots (i.e., one slot group) at 960khz may be determined with reference to the random access configuration of 80 slots (i.e., in the case of 120khz) determined according to the acquired random access configuration index. At this time, it is not necessary to consider the case of configuring the entire RACH frame to be 10 ms. The specific determination mode is at least one of the following modes:

■ is determined by the configured RACH duration period T _ duration (because the random access resources within one random access resource configuration period T _ duration are within the RACH duration), which may also be referred to as RACH frame duration T _ duration. For example, the T _ duration may be configured separately, or a different T _ duration may be configured by changing the length T _ SF of the system frame (i.e., the same as the length of the system frame in terms of T _ duration). The value range of T _ duration may be one or more of {1.25, 2.5, 5, 10} ms, and/or may be obtained by multiplying a scaling factor (scaling factor) by the time length of the system frame, for example, the configured scaling factor may be one or more of {1/8, 1/4, 1/2 };

■ is determined by the configured random access resource configuration period T _ periodicity, for example, by adding the random access resource configuration period indication alone, or by applying the configured scaling factor (scaling factor) and/or offset (offset) to the existing random access resource configuration period. For example, the separately increased random access resource configuration period may be one or more of {1.25, 2.5, 5} ms; or the configured scaling factor may be one or more of {1/8, 1/4, 1/2} (e.g., the configured scaling factor is 1/8, and the configured random access resource configuration period is 10ms, then the actual UE-determined random access resource configuration period is 10/8 ═ 1.25ms), and/or the configured offset may be one or more of {8.75,7.5,5} ms;

■ preferably, the UE can determine the specific location of the configured random access resource in one RACH configuration period by the indication of the location of the configured random access resource. The specific determination method is at least one of the following methods:

determining a system frame where the configured RACH resource is located. Whether a given SFN contains RACH resources may be determined by configuring the value of the system frame number SFN mod (T _ periodicity/10 ms). For example, if the system frame length is 10ms, T _ periodicity is 40ms, and the configured SFN mod (T _ periodicity/10ms) is 2, then the system frame has RACH resources only when the SFN is a multiple of 4 + 2. In addition, when T _ periodicity is 5ms, the system frame is still 10ms, i.e. the length of the system frame is greater than (and/or is a positive integer multiple of T _ periodicity), it indicates that there is RACH resource in each system frame;

determining a position of a configured RACH-occupied time period in one RACH configuration period. The specific location of the configured RACH duration period in one RACH configuration period may be determined by configuring an N _ duration _ index value, where the N _ duration _ index is an index value of the location of one RACH duration period in one RACH configuration period, and is in a range from {0, 1 … T _ duration/T _ duration }. For example, if the configured T _ periodicity is 5ms and T _ duration is 1.25ms, the value of N _ duration _ index is {0, 1, 2 … 3 }. That is, when the configured N _ propagation _ index is 0, it indicates that the first 1.25ms in one 5ms RACH configuration period is the time period in which the RACH is located. Preferably, the N _ propagation _ index may be indicated by the aforementioned bitmap, or obtained by table lookup, and the method is the same and is not described again.

Preferably, when the RACH configuration period is greater than the system frame length, a system frame where the configured RACH resource is located may be first determined according to the foregoing method, and then a specific location where the RACH resource occupied time period in the system frame carrying the random access resource is located is obtained according to the configured N _ propagation _ index, that is, N _ propagation _ index in the foregoing method is an index value of a location of the RACH occupied time period on the system frame carrying the random access resource, and a value range is from {0, 1 … T _ SF/T _ propagation };

in the process of determining the random access configuration information, signaling overhead is saved by reusing the random access resource index in the random access configuration information, and the UE is helped to quickly determine the random access resource under the condition of high subcarrier spacing. In addition, since the random access configuration is reused to the maximum extent, the random access configuration information table does not need to be redesigned.

In the configuration of ROs, a sufficiently large gap formed between two ROs is required in order to secure the UE sufficient time to perform LBT operation before the selected RO. RO may be indicated by at least one of the following:

■ explicitly (explicit) informs the available RO index in one slot (in higher layer signaling and/or in DCI configuration) through the bit field. When available ROs in one slot are notified, the available ROs are configured as odd-indexed ROs, or even-indexed ROs, or every nth RO; n is a positive integer;

■ use a bitmap to inform which ROs in a slot are available, 1 for available and 0 for unavailable. For example, when there are 6 ROs in a slot, the UE may determine that

RO indexes

1, 3, and 5 are available ROs as indicated by a 6-bit bitmap 010101. Preferably, the required number of bits of the bitmap is determined by the preamble format and/or the indication of the required number of bits of the bitmap (e.g., 0 or 1), as shown in table 3. For example, when the preamble format is a1 and the required number of bits indicates 0, the UE determines that the required number of bits for the bitmap is 6. . Preferably, when the required bit number indicates that it is not configured, the UE determines that the required bit number value is 1; preferably, for the preamble format of the long sequence and the B4 format, the UE determines that the required bit value is 1; preferably, the required number of bits may also be represented by "the number of ROs in one PRACH slot" in a row corresponding to the random access resource configuration index in the random access resource configuration table (e.g., table 1);

● Table 3 number of bits required for bitmap

■ are indicated by the configured available RO interval values. The UE may determine available ROs based on the configured available RO interval value. For example, in the case where the configured available RO interval value is 2 OFDM symbols and there are 6 consecutive ROs in one slot, each of which occupies 2 OFDM symbols (e.g., PRACH format a1/B1), the next RO that is at least 2 OFDM symbols or more apart from the first RO (end position) is the available RO, i.e., the third RO, and the RO that is at least 2 OFDM symbols apart from the third RO (end position) is the next available RO, i.e., the 5 th RO, and so on. Preferably, the configured available RO interval value indication may be explicitly notified to the UE by the base station through a bit field, or may be derived by the UE based on a time required for LBT, T _ LBT, by a formula [ T _ LBT/T _ OFDM symbol ], where T _ OFDM symbol is a time of one OFDM symbol and [ ] is an operation of rounding up or rounding down a number in [ ]. Preferably, the estimated starting location (i.e., the first available RO) may be the first RO over a period of time, which may be at least one of:

one RACH configuration period

A mapping ring of > one downlink signal to RACH;

a mapping association period from a downlink signal to RACH;

a mapping association pattern period from a downlink signal to RACH;

> one system frame;

a time period occupied by > one RACH;

■, preferably, the configured ROs in each of the plurality of slot groups are the same,

■ preferably, the RO indication manner of the above method can be applied to the RO in one time slot, or can be applied to the RO to which each downlink signal (e.g. SSB, CSI-RS) is mapped after the downlink signal is mapped to the RO;

■ preferably, it is also determined that there is a sufficient interval value between two available ROs by performing a validity judgment on the configured RO, and the specific determination may be at least one of the following:

indicated by a configured valid RO interval value. When a configured RO is spaced apart from a previous valid RO by a value greater than (or not less than) a configured valid RO spacing value, the UE may determine that the configured RO is valid. For example, in the case where the configured valid RO interval value is 2 OFDM symbols, and there are 6 consecutive ROs in one slot, each RO occupies 2 OFDM symbols (e.g., PRACH format a1/B1), the first RO (end position) of the current slot is less than 2 OFDM symbols apart from the second RO, the second RO is an invalid RO, the third RO is a valid RO, and the RO at least 2 OFDM symbols apart from the third RO (end position) is the next valid RO, i.e., the 5 th RO, and so on. Preferably, the configured valid RO interval value indication may be explicitly notified to the UE by the base station through a bit field, or may be derived by the UE based on a time required for LBT, T _ LBT, by a formula [ T _ LBT/T _ OFDM symbol ], where T _ OFDM symbol is a time of one OFDM symbol and [ ] is an operation of rounding up or rounding down a number in [ ];

comparison by configured invalid patterns (invalid patterns). That is, when one RO does not have a (time domain) overlapping part with an invalid pattern configured by the base station (and/or the interval is not less than or greater than a certain threshold value), the UE determines that the RO is a valid RO, and otherwise, the RO is an invalid RO;

preferably, the determination starting position of the valid RO (i.e. the first valid RO) may be the first available RO within a period of time, which may be at least one of:

one RACH configuration period

A mapping loop of downlink signals to RACH;

a mapping period of a downlink signal to RACH;

a mapping pattern period of a downlink signal to RACH;

one system frame;

one RACH duration;

■ preferably, the availability determination may be made first and then the validity determination made, or vice versa.

By the above determination of the availability and/or validity of ROs, sufficient separation between ROs may be made for LBT operations.

● after sending the random access preamble on the selected RO, the UE may need to search for the random access feedback in a certain RAR window, and needs to search for whether there is a PDCCH scrambled with a matching RA-RNTI (or MSGB-RNTI in case of two-step random access) in the configured search space, then for the RACH resource configured with higher SCS, the RA-RNTI may be calculated in one of the following manners:

when a RACH cycle may contain up to 640 slots (in the example of 960khz), when using independent indices within the slot group: RA-RNTI ═ 1+ s _ id +14 × t _ id +14 × 80 × f _ id +14 × 80 × 8 × slotted _ id +14 × 80 × 8 × ul _ carrier _ id, where s _ id is the first OFDM symbol index of the selected RO (0 ≦ s _ id <14), t _ id is the index of the slot in the slot group in which the selected RO is located (0 ≦ t _ id <80), f _ id is the index value of the selected RO in the frequency domain (0 ≦ f _ id <8), slotted _ id is the index of the slot group in which the selected RO is located (0 ≦ slotted _ id <8), and ul _ carrier _ id is the index of the carrier for random access (0 represents the normal uplink carrier, 1 is the supplemental uplink carrier). Preferably, slotgroup _ id can be exchanged with f _ id; or

When a maximum of 640 slots (in the example of 960khz) may be included in a RACH cycle, when a common index is used: RA-RNTI _ id +14 × t _ id +14 × 640 × f _ id +14 × 640 × 8 × ul _ carrier _ id; wherein s _ id is the index of the first OFDM symbol of the selected RO (0 ≦ s _ id <14), t _ id is the index of the slot in which the selected RO is located (0 ≦ t _ id <640), f _ id is the index value of the selected RO in the frequency domain (0 ≦ f _ id <8), and ul _ carrier _ id is the index of the carrier performing random access (0 for normal uplink carrier, 1 for supplementary uplink carrier);

similarly, the way MSGB-RNTI is calculated may be one of:

o MSGB-RNTI is 1+ s _ id +14 × t _ id +14 × 80 × f _ id +14 × 80 × 8 × slotgroup _ id +14 × 80 × 8 × 8 × ul _ carrier _ id +14 × 80 × 8 × 8 × 2; wherein s _ id is the index of the first OFDM symbol of the selected RO (0 ≦ s _ id <14), t _ id is the index of the slot in the slot group in which the selected RO is located (0 ≦ t _ id <80), f _ id is the index of the selected RO in the frequency domain (0 ≦ f _ id <8), slotted _ id is the index of the slot group in which the selected RO is located (0 ≦ slotted _ id <8), and ul _ carrier _ id is the index of the carrier performing random access (0 represents the normal uplink carrier, 1 represents the supplemental uplink carrier); preferably, slotgroup _ id can be exchanged with f _ id; or

MSGB-RNTI ═ 1+ s _ id +14 × t _ id +14 × 640 × f _ id +14 × 640 × 8 × ul _ carrier _ id +14 × 80 × 8 × 8 × 2; where s _ id is the first OFDM symbol index of the selected RO (0 ≦ s _ id <14), t _ id is the index of the slot in which the selected RO is located (0 ≦ t _ id <640), f _ id is the index value of the selected RO in the frequency domain (0 ≦ f _ id <8), and ul _ carrier _ id is the index of the carrier performing random access (0 represents a normal uplink carrier, 1 is a supplementary uplink carrier).

In another embodiment of the present invention, for example, when the present invention is applied to small packet data transmission (small data transmission), coverage enhancement (concurrent enhancement), reduced capability (reduced capability), or other purposes or scenarios, the ue receives a random access configuration applied to one or more of the purposes or scenarios, and determines a random access resource used in the scenario or purpose based on the random access configuration, and performs uplink signaling.

Wherein the random access configuration may comprise a combination of one or more of the following (interchangeable):

● random access opportunity (RO), including combinations of one or more of the following (interchangeable):

o random access configuration index

The number of the frequency domain ROs,

if the SDT has a single BWP, that is, the SDT-specific BWP, when association (association) of the SSB-RO is performed, the UE uses pattern of the SSB on the initial BWP to perform validation judgment of the RO and subsequent mapping association operation of the SSB-RO;

● random access preamble (RACH preamble) configuration, including one or more of the following in combination

(interchangeable):

o number of preambles per SSB in each RO, N _ preamble

Location of start of preamble in each RO for each SSB, specifically, there is

■ explicitly indicates the preamble start index, e.g., N _ preamble preambles from preamble 24 for the preamble of SDT; in particular, to reduce signaling overhead, the number of starting points may be limited, e.g., only 4 starting point values, may be indicated using only 2 bits, and/or

■ the default starting location is derived from the end location of the preamble portion of each SSB in each RO, i.e., N _ preamble preambles going from back to front. As shown in fig. 11, it is assumed that there are 64 preambles on one RO, and there are 2 SSBs, i.e., SSB0 and SSB1 mapped on one RO; for SSB0, the preamble start point of 4step RACH is 0, and the number is 8; the starting point of the preamble of the 2-step RACH is the end point of the 4-step RACH, namely, the preamble index 8, the number of the preamble is 8, and for the SDT preamble of the SSB0, the preamble index 31 corresponding to the end of the preamble of the SSB0 is pushed from back to front to 8 (i.e., N _ preamble is 8), namely, the preamble indexes 24 to 31; similarly, the SDT preamble corresponding to the SSB1 can be derived from the end corresponding to the SSB1, i.e., the preamble index 63, and the preamble indices 56-63 can be derived from the back to the front, which can reduce the signaling overhead compared to the explicit indication method, although a certain flexibility is lost;

● PUSCH configuration, comprising a combination (interchangeable) of one or more of:

the time domain configuration number of PUSCH Occasion (PO);

the number of POs in the frequency domain;

if the SDT has a single BWP, namely SDT-specific BWP, when association (association) of SSB-PO is carried out, the UE uses pattern of SSB on the initial BWP to carry out validation judgment of PO and subsequent mapping association operation of SSB-PO;

fig. 8 is a user equipment 800 according to an embodiment of the present invention. The user equipment comprises a memory 801 and a processor 802, wherein the memory stores computer-executable instructions, and when the instructions are executed by the processor, the user equipment executes at least one method corresponding to the above-mentioned embodiment of the disclosure.

Fig. 9 is a base station 900 according to the present embodiment, which includes a memory 901 and a processor 902, wherein the memory stores computer executable instructions, and when the instructions are executed by the processor, the base station performs at least one method corresponding to the above embodiments of the present disclosure.

The present disclosure also provides a computer-readable medium having stored thereon computer-executable instructions that, when executed, perform any of the methods described in the embodiments of the present disclosure.

Specifically, for example, the processor may be configured to send configuration information to the user equipment side (the configuration information is the same as that described above, and is not described herein again); and detecting a possible random access preamble signal on the configured random access opportunity; or the base station or the network device detects the uplink signal sent by the user equipment on the configured uplink transmission resource.

"user equipment" or "UE" herein may refer to any terminal having wireless communication capabilities including, but not limited to, mobile telephones, cellular telephones, smart phones, or Personal Digital Assistants (PDAs), portable computers, image capture devices such as digital cameras, gaming devices, music storage and playback appliances, as well as any portable unit or terminal having wireless communication capabilities, or internet appliances permitting wireless internet access and browsing, among others.

The term "base station" (BS) or "network equipment" as used herein may refer to an eNB, eNodeB, NodeB or Base Transceiver Station (BTS) or gNB, etc., depending on the technology and terminology used.

The "memory" herein may be of any type suitable to the technical environment herein, and may be implemented using any suitable data storage technology, including, without limitation, semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory.

The processors herein may be of any type suitable to the technical environment herein, including without limitation one or more of the following: general purpose computers, special purpose computers, microprocessors, digital signal processors, DSPs, and processors based on a multi-core processor architecture.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Those skilled in the art will appreciate that the present invention includes apparatus directed to performing one or more of the operations described in the present application. These devices may be specially designed and manufactured for the required purposes, or they may comprise known devices in general-purpose computers. These devices have stored therein computer programs that are selectively activated or reconfigured. Such a computer program may be stored in a device (e.g., computer) readable medium, including, but not limited to, any type of disk including floppy disks, hard disks, optical disks, CD-ROMs, and magnetic-optical disks, ROMs (Read-Only memories), RAMs (Random Access memories), EPROMs (Erasable Programmable Read-Only memories), EEPROMs (Electrically Erasable Programmable Read-Only memories), flash memories, magnetic cards, or optical cards, or any type of media suitable for storing electronic instructions, and each coupled to a bus. That is, a readable medium includes any medium that stores or transmits information in a form readable by a device (e.g., a computer).

It will be understood by those within the art that each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by computer program instructions. Those skilled in the art will appreciate that the computer program instructions may be implemented by a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, implement the features specified in the block or blocks of the block diagrams and/or flowchart illustrations of the present disclosure.

Those of skill in the art will appreciate that various operations, methods, steps in the processes, acts, or solutions discussed in the present application may be alternated, modified, combined, or deleted. Further, various operations, methods, steps in the flows, which have been discussed in the present application, may be interchanged, modified, rearranged, decomposed, combined, or eliminated. Further, steps, measures, schemes in various operations, methods, procedures disclosed in the prior art and the present invention can also be alternated, changed, rearranged, decomposed, combined, or deleted.

The foregoing is only a partial embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A random access method of User Equipment (UE) comprises the following steps:

acquiring random access resource configuration information;

determining a subcarrier interval of a random access preamble;

determining a random access opportunity (RO) according to the random access resource configuration information and the subcarrier interval of the random access preamble; and

and transmitting the random access preamble on the determined RO.

2. The random access method of claim 1, wherein determining the subcarrier spacing of the random access preamble comprises one of:

determining a subcarrier spacing of a random access preamble according to an indication of the subcarrier spacing of the random access preamble received via a higher layer signaling or a physical layer message; or

And determining the subcarrier interval of the random access preamble according to the subcarrier interval at the frequency position of the UE.

3. The random access method of claim 1, wherein determining the subcarrier spacing of the random access preamble comprises:

and if the indication of the subcarrier interval of the random access lead code is not received, determining the subcarrier interval of the random access lead code according to the subcarrier interval size of the frequency position of the UE.

4. The random access method of claim 1, determining a random access opportunity (RO) according to the random access resource configuration information and the subcarrier spacing of the random access preamble, comprising at least one of:

when the determined subcarrier interval of the random access preamble code is the first subcarrier interval, determining corresponding random access resources according to a random access configuration index in random access configuration information, and determining an RO according to the random access resources; or

Determining one or more time slot groups in which random access resources exist when the determined subcarrier interval of the random access preamble is a second subcarrier interval, and determining configured ROs according to a random access configuration index in the random access configuration information based on the determined one or more time slot groups, wherein the configured ROs in each of the plurality of time slot groups are the same;

wherein the second subcarrier spacing is greater than the first subcarrier spacing.

5. The random access method of claim 4, wherein determining that the one or more groups of slots for which random access resources exist comprises at least one of:

determining one or more time slot groups in which the random access resources exist according to the obtained bitmap indicating the time slot groups in which the random access resources exist;

determining one or more time slot groups with random access resources by looking up a table according to the obtained index indication, wherein the index indication is used for indicating the one or more time slot groups with the random access resources; or

And determining one or more time slot groups with the random access resources according to the position of the first time slot group with the random access resources, the number of the time slot groups with the random access resources, the position relation and the derivation direction among the time slot groups with the random access resources.

6. The random access method of claim 1, wherein when the determined subcarrier spacing of the random access preamble is the second subcarrier spacing, the determining the RO comprises:

acquiring an indication of the position of the configured random access resource occupied period T _ duration in the configured random access resource configuration period T _ duration,

according to the acquired indication of the position, the position of the T _ duration in the T _ duration is determined, and

and determining the RO according to the random access configuration index in the random access configuration information based on the position of the T _ propagation in the T _ propagation.

7. The random access method of claim 6, wherein determining the location of the T _ duration in the T _ duration according to the obtained indication of the location comprises:

and determining the position of the T _ propagation in the random access resource configuration period according to the configured N _ propagation _ index, wherein the N _ propagation _ index is the position index of the T _ propagation in the configured T _ propagation.

8. A random access method according to any one of claims 1 to 7,

determining the RO further includes determining that the RO is available and/or determining that the RO is valid,

wherein determining that the RO is available comprises at least one of:

determining whether the available RO is an odd index RO, an even index RO or every nth RO when indicated by the configured available RO index, wherein n is a positive integer;

determining available ROs according to a configured bitmap about the available ROs; or

Determining available RO according to the configured interval value of the available RO;

wherein determining that the RO is valid comprises at least one of:

determining a valid RO according to the configured valid RO interval value;

determining a valid RO by comparing the RO with the configured invalid pattern; or

And determining the effective RO according to the judgment initial position of the effective RO.

9. A user equipment, UE, comprising:

a memory having computer-executable instructions stored thereon; and

a processor that, when executed by the processor, performs the method of any of claims 1 to 8.

10. A random access method of a base station comprises the following steps:

and sending the random access configuration information to User Equipment (UE).

11. The random access method of claim 10, comprising:

an indication of a subcarrier spacing of a random access preamble to a user equipment UE,

wherein the random access resource configuration information and the subcarrier spacing of the random access preamble are used by the UE to determine a random access opportunity (RO).

12. A base station, comprising:

a memory having computer-executable instructions stored thereon; and

a processor that when executed by the processor performs the method of any of claims 10 and 11.