Random access method and apparatus, and communication system

Abstract

The present application relates to the field of communications, and provides a random access method and apparatus, and a communication system. On the basis compensation frequencies corresponding to respective ROs in an RO group, a terminal device side applies a compensation frequency to a frequency domain resource used for transmission of a PRACH signal; and transmits frequency-compensated PRACH signals by using the RO group. A network device side receives a plurality of PRACH signals transmitted by the terminal device; determines an optimal dynamic compensation frequency on the basis of the plurality of PRACH signals; and transmits a random access response message indicating the optimal dynamic compensation frequency. Therefore, a terminal device can transmit random access information with real-time and high-precision frequency compensation applied thereto, such that a network device can receive access information using a corresponding matching frequency, thereby achieving better reception performance.

Description

A random access method, apparatus and communication system

[0001] This application claims priority to Chinese Patent No. 202510214115.9, filed on February 25, 2025, entitled “A Random Access Method, Apparatus and Communication System”, all contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of communications, and more particularly to a random access method, apparatus and communication system. Background Technology

[0003] Compared to terrestrial networks (TN), non-terrestrial networks (NTN) suffer from significant propagation delays and Doppler shifts. The time-frequency drift caused by the rapid movement of low- and medium-Earth orbit satellites poses a significant challenge to synchronization schemes based on terminal mobility in TN. Furthermore, due to constraints such as limited satellite payload power, large satellite coverage areas, and limited feeder link bandwidth, NTN often experiences poor downlink coverage performance.

[0004] User Equipment (UE) achieves uplink time and frequency synchronization by sending Physical Random Access Channel (PRACH) signals and receiving feedback from the base station during the access process. However, due to the limited transmit power of UEs and their significantly longer communication distances in NTNs compared to traditional TNs, particularly for (e)RedCap type UEs with limited capabilities and even weaker IoT physical network type UEs accessing the NTN, using the TN-oriented PRACH scheme may result in the UE's random access messages not being properly received and decoded by the base station, directly impacting uplink synchronization performance. Summary of the Invention

[0005] For uplink frequency synchronization, according to the existing 3GPP NR NTN protocol, terminal devices can obtain their location information through their own Global Navigation Satellite System (GNSS) module and obtain ephemeris information from the system information broadcast by the base station. This allows for the comprehensive calculation of the Doppler frequency shift of the serving link and the frequency domain pre-compensation of the transmitted PRACH. However, due to various disturbances affecting satellite motion and the limited positioning accuracy of terminal devices, and because network equipment cannot provide direct frequency compensation information to terminal devices during the initial access phase, the calculation accuracy and real-time performance of open-loop frequency pre-compensation algorithms that rely on (semi-)static ephemeris information will also be affected.

[0006] This application addresses the problem in existing communication systems, especially NTN systems, where network devices cannot provide direct frequency compensation information to terminal devices during the terminal device access process, resulting in low pre-compensation frequency accuracy due to various disturbances affecting the network devices.

[0007] To address the aforementioned technical problems, this application provides a random access device for a terminal device, comprising:

[0008] The processing unit is configured to add a compensation frequency to the frequency domain resources used for transmitting PRACH signals according to the compensation frequency corresponding to each RO in the RO group.

[0009] A transmitting unit configured to transmit a frequency-compensated PRACH signal using the RO group.

[0010] This application also provides a random access device, wherein the device is applied to a network device and includes:

[0011] The receiving unit is configured to receive multiple PRACH signals sent by the terminal device, wherein the frequency domain resources used for transmitting the PRACH signals are supplemented with a compensation frequency.

[0012] A processing unit configured to determine an optimal dynamic compensation frequency based on the plurality of PRACH signals;

[0013] The first sending unit is configured to send a random access response message indicating the optimal dynamic compensation frequency.

[0014] This application also provides a random access method, wherein the terminal device includes:

[0015] Based on the compensation frequency corresponding to each RO in the RO group, a compensation frequency is added to the frequency domain resources used for transmitting PRACH signals.

[0016] The RO group is used to transmit a frequency-compensated PRACH signal.

[0017] This application also provides a random access method, wherein the method is applied to a network device and includes:

[0018] The receiving terminal device sends multiple PRACH signals, and the frequency domain resources used to transmit the PRACH signals are supplemented with compensation frequencies.

[0019] Determine the optimal dynamic compensation frequency based on the multiple PRACH signals;

[0020] Send a random access response message indicating the optimal dynamic compensation frequency.

[0021] This application also provides a communication system, which includes: a terminal device and a network device;

[0022] The terminal device is configured to execute a random access method applied to the terminal device side;

[0023] The network device is configured to perform a random access method applied to the network device side.

[0024] The random access method, apparatus, and communication system provided in this application combine random access time group (RO group) with PRACH transmission frequency compensation, enabling terminal equipment to carry real-time and high-precision frequency compensation when sending random access information. This allows network equipment (base station) to receive access information using a matching frequency, thereby achieving better reception performance.

[0025] To make the above and other objects, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 shows a structural diagram of a communication system according to an embodiment of this application;

[0028] Figure 2 shows a flowchart of a random access method applied to the terminal device side according to an embodiment of this application;

[0029] Figure 3 shows another flowchart of the random access method applied to the terminal device side according to an embodiment of this application;

[0030] Figure 4 shows another flowchart of the random access method applied to the terminal device side according to an embodiment of this application;

[0031] Figure 5 shows a flowchart of a random access method applied to the network device side according to an embodiment of this application;

[0032] Figure 6 shows another flowchart of a random access method applied to the network device side according to an embodiment of this application;

[0033] Figure 7 shows a structural diagram of a random access device applied to the terminal device side according to an embodiment of this application;

[0034] Figure 8 shows another structural diagram of a random access device applied to the terminal device side according to an embodiment of this application;

[0035] Figure 9 shows another structural diagram of a random access device applied to the terminal device side according to an embodiment of this application;

[0036] Figure 10 shows a structural diagram of a network device random access device according to an embodiment of this application;

[0037] Figure 11 shows another structural diagram of a network device random access device according to an embodiment of this application;

[0038] Figure 12 shows a structural diagram of a terminal device according to an embodiment of this application;

[0039] Figure 13 shows a schematic diagram of the network device configuration according to an embodiment of this application;

[0040] Figure 14 shows a schematic diagram of the random access process according to an embodiment of this application;

[0041] Figure 15 shows a schematic diagram of the association cycle of SSB mapping to RO in an embodiment of this application. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, apparatus, product, or device that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0044] In this specification, unless otherwise stated, "and / or" describes an association between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. Furthermore, in this disclosure, unless otherwise stated, "multiple" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0045] In this specification, the expressions "greater than" or "less than" may be used to determine whether a specific condition is met. However, this is only for illustrative purposes and is not intended to exclude statements of "above" or "below". A condition described as "above" may be replaced by "greater than", a condition described as "below" may be replaced by "less than", and a condition described as "above and less than" may be replaced by "greater than and below". Furthermore, hereinafter, "A" to "B" represent at least one of the elements from A (inclusive) to B (inclusive).

[0046] In the embodiments of this application, the singular forms "a," "the," etc., including the plural forms, should be broadly understood as "a kind" or "a class" rather than limited to the meaning of "an." Furthermore, the term "the" should be understood to include both the singular and plural forms, unless the context explicitly indicates otherwise. Additionally, the term "according to" should be understood as "at least partially based on…," and the term "based on" should be understood as "at least partially based on…," unless the context explicitly indicates otherwise.

[0047] This specification provides the operational steps of the methods described in the embodiments or flowcharts, but based on conventional or non-inventive labor, more or fewer operational steps may be included. The order of steps listed in the embodiments is merely one possible execution order among many and does not represent the only possible execution order. In actual system or device products, the methods shown in the embodiments or drawings can be executed sequentially or in parallel.

[0048] It should be noted that in the embodiments of this application, certain software, components, models and other existing solutions in the industry may be mentioned. These should be regarded as exemplary and are only intended to illustrate the feasibility of implementing the technical solution of this application. However, it does not mean that the applicant has used or necessarily used the solution.

[0049] This application uses terminology used in some communication specifications (e.g., the 3rd Generation Partnership Project, 3GPP, the European Telecommunications Standards Institute, ETSI, Extensible Radio Access Network, ERAN, and Open-Radio Access Network, O-RAN) to describe various embodiments, but this is merely illustrative. The various embodiments of this application can be readily modified and applied in other communication systems.

[0050] In the embodiments of this application, communication between devices in the communication system can be carried out according to communication protocols at any stage, such as including but not limited to the following communication protocols: 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G and 5G, New Radio (NR) and / or other currently known or future communication protocols.

[0051] For ease of understanding, the technical terms involved in the embodiments of this application will be explained below.

[0052] (1) Terminal Device: refers to a device with wireless transceiver capabilities that can cooperate with network-side equipment to provide communication services to users. Terminal devices can also be called terminals, user equipment (UE), user terminals, mobile terminals (MT), or user agents, etc. For example, terminal devices can be mobile phones, tablets, laptops, wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless communication devices, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, Internet of Things (IoT) devices, narrowband Internet of Things (NB-IoT) devices, vehicle-to-everything (V2X) devices, devices in device-to-device communication (D2D), enhanced machine-type communication (eMTC) devices, and reduced-capacity devices. Capability (RedCap), cellular phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), clients, handheld devices with wireless communication capabilities, vehicle-mounted devices, or shipboard devices, etc.

[0053] In scenarios such as the Internet of Things (IoT), terminal devices can also be machines or devices used for monitoring or measurement, including but not limited to: machine-type communication (MTC) terminals, vehicle-mounted communication terminals, device-to-device terminals, machine-to-machine (M2M) terminals, and so on.

[0054] (2) Network equipment: refers to network-side equipment capable of communicating with terminal equipment. Network equipment can be located on satellites or the ground. Network equipment can also be called space base stations, satellite-borne base stations, satellites, satellite communication nodes, satellite network terminal equipment, satellite communication modules, or base stations, etc. This network-side equipment can also be called access network equipment or wireless access network equipment. Network-side equipment can be a base station (BTS) in a satellite-borne Global System for Mobile Communication (GSM) or Code Division Multiple Access (CDMA) communication system, a base station (NodeB, NB) in a satellite-borne Wideband Code Division Multiple Access (WCDMA) system, an evolved base station (eNB, eNodeB) in a satellite-borne LTE system, a base station in a terrestrial network or non-terrestrial network (NTN), such as a base station (gNB) in a satellite-borne 5G network, a base station in a future network after 5G (e.g., 6G network), a base station in a future evolved Public Land Mobile Network (PLMN) network, a Transmission Reception Point (TRP) in a satellite, or a Cloud Radio Access Network in a satellite. In the context of Networks (CRAN), wireless controllers can also be satellite-borne city base stations, micro base stations, pico base stations, or femtobase stations. Base stations can also be ground-based base stations capable of satellite communication, and can be referred to as Access Points (APs), 5G nodes (5th generation nodes), wireless points, or Transmission / Reception Points (TRPs), the latter being other terms with equivalent technical meanings. Network equipment can also refer to base station equipment carried by High Altitude Platform Stations (HAPS) with loiter capabilities, such as large balloons or airships, base station equipment in Roadside Units (RSUs), or base station equipment in vehicle-to-everything (V2X) networks.

[0055] Both terminal devices and base station devices can perform beamforming, but the embodiments of this application are not limited to this. In some embodiments, the terminal may or may not perform beamforming. Furthermore, the base station may or may not perform beamforming. That is, only one of the terminal and the base station can perform beamforming, or neither the terminal nor the base station may perform beamforming. In this application, a beam refers to the spatial flow of signals in a wireless channel, formed by one or more antennas or antenna elements; such a formation process can be called beamforming.

[0056] Furthermore, the term "network side" or "network equipment side" refers to one side of the network, which can be a base station or include one or more network devices as described above. The term "terminal side" or "terminal equipment side" refers to the side of the user or terminal, which can be a UE or include one or more terminal devices as described above.

[0057] Typically, before data transmission, terminal devices and network devices must connect to the network device through an initial access procedure. The initial access procedure includes stages such as cell search, system information reception, and random access. Cell search is the process by which the UE uses cell synchronization signals to achieve downlink time-frequency synchronization and obtain the Physical Cell Identity (PCID). Subsequently, the UE obtains the system information necessary for random access by receiving the Physical Broadcast Channel and the Physical Downlink Shared Channel (PDSCH) carrying the minimum remaining system information. Finally, the UE achieves uplink time synchronization and obtains the Cell Radio Network Temporary Identifier (C-RNTI) information through the random access procedure.

[0058] Before the random access procedure, the UE obtains the Synchronization Signal / PBCH Block (SSB) index set, Physical Random Access Channel (PRACH) time-frequency resources, PRACH preamble format, and PRACH preamble sequence set parameters via system messages. PRACH resources are periodic resources; in the time domain, different PRACH preamble formats have different durations. The configuration method for PRACH time-domain resources is the same as in Long Term Evolution (LTE), i.e., the PRACH configuration is determined by looking up a predefined configuration table in the protocol. There are 256 configurable indices, notified by 8-bit signaling in SIB1. For each configuration index, the table defines the PRACH configuration period, system radio frame index, subframe / slot index, starting PRACH OFDM symbol index within a slot, and the number of time-domain ROs. The selectable values ​​for the PRACH configuration period are {10, 20, 40, 80, 160} ms. Within each PRACH configuration period, PRACH resources exist only within one valid radio frame (10 ms). This radio frame contains one or more subframes / slots. Within each subframe / slot, there is only one starting PRACH OFDM symbol index. Each slot contains one or more time-domain ROs. In the frequency domain, different PRACH preamble formats and subcarrier spacing jointly determine the frequency domain bandwidth occupied by the PRACH. The number of different PRACH frequency domain resources used for Frequency Division Multiplexing (FDM) occupying the same time domain resources is 1, 2, 4, and 8, with the specific value notified by the 2-bit signaling in SIB1.

[0059] The 3GPP NR standard defines three PRACH configuration tables, which indicate the PRACH preamble format, period, system frame number, subframe / slot number, start symbol index within a slot, and number of time-domain ROs within a slot through the PRACH configuration index. When the PRACH preamble subcarrier spacing is 15kHz, there is one PRACH slot in a subframe. When the subcarrier spacing is 30kHz, there are one or two PRACH slots in a subframe. If there is only one slot, the second PRACH slot is used. If multiple ROs are configured in a slot, the ROs are numbered sequentially in the time domain.

[0060] The UE generates a PRACH preamble sequence based on the PRACH preamble format and the PRACH preamble sequence set parameters, and randomly selects a PRACH time-frequency resource from the PRACH time-frequency resource candidate set to send random access information (e.g., message 1, Msg1, message A, MsgA, which at least contains the PRACH preamble sequence). The base station detects the preamble sequence, and if the base station detects the preamble sequence, it feeds back the corresponding random access response (RAR) information on the PDCCH / PDSCH.

[0061] A random access opportunity (RO) refers to the time-frequency resources used to transmit an initial access message (e.g., message 1, MsgA) based on a PRACH preamble through a specific transmit beam. To improve uplink coverage for random access, for PRACH transmissions that use repeated preambles, a PRACH opportunity (RO) refers to the time-frequency resources used for transmitting a preamble.

[0062] For NR coverage enhancement, the 3GPP standard introduces the PRACH enhancement method. Through the random access time group (RO group) method in the 3GPP standard, where each RO group contains multiple time-domain consecutive ROs, the UE's access capability and uplink synchronization performance can be significantly improved by repeatedly transmitting PRACH data from the terminal and jointly receiving it with the base station.

[0063] Furthermore, for uplink frequency synchronization, according to the existing 3GPP NR NTN protocol, the terminal can obtain its position information through its own Global Navigation Satellite System (GNSS) module and obtain ephemeris information from the system information broadcast by the base station. This allows for the comprehensive calculation of the Doppler frequency shift of the serving link and frequency domain pre-compensation of the transmitted PRACH. However, due to various disturbances affecting satellite motion and the limited positioning accuracy of terminal equipment, and because network equipment cannot provide direct frequency compensation information to terminal equipment during the access phase, the calculation accuracy and real-time performance of open-loop frequency pre-compensation algorithms that rely on (semi-)static ephemeris information will also be affected.

[0064] To address the aforementioned technical problems in the existing technology, this application proposes a scheme that combines RO group with PRACH transmission frequency compensation. This scheme enables terminal devices to carry real-time and high-precision frequency compensation when sending random access information, thereby allowing network devices (such as base stations) to receive access information using a matching frequency and obtain better reception performance.

[0065] First aspect of the embodiments

[0066] The first aspect of this application provides a communication system, as shown in FIG1, which includes a terminal device 101 and a network device 102.

[0067] Terminal device 101 is configured to perform the following: add a compensation frequency to the frequency domain resources used for transmitting PRACH signals according to the compensation frequency corresponding to each RO in the RO group; and send frequency-compensated PRACH signals using the RO group, that is, send PRACH signals using RO groups with frequency domain compensation.

[0068] Among them, the RO group corresponds to a certain number of PRACH repetitions. For example, if the RO group includes N RO time-frequency resources, then the number of PRACH repetitions is N.

[0069] The transmission of the PRACH signal can also be referred to as the transmission of the random access preamble.

[0070] In this application, the addition of compensation frequency to the frequency domain resources refers to the addition of compensation frequency to the frequency of the frequency domain resources. This compensation corrects the received PRACH frequency drift caused by the Doppler frequency shift phenomenon.

[0071] In some implementations, the compensation frequency corresponding to each RO in the RO group may be different. In specific implementation, it can be determined according to one or more of the constraints such as satellite capability, dynamic scene, set of time and frequency resource parameters used, motion parameters (altitude, speed, etc.), and can also be configured by network device 102. This application does not limit the absolute value of the compensation frequency corresponding to each RO in the RO group.

[0072] In some implementations, the compensation frequency corresponding to each RO in the RO group is a multiple of the basic compensation frequency. Specifically, the basic compensation frequency can be determined based on one or more constraints such as satellite capabilities, dynamic scenarios, the set of time-frequency resource parameters used, and motion parameters (altitude, speed, etc.). The basic compensation frequency can also be configured by network device 102. This application does not limit the method or value for determining the basic compensation frequency.

[0073] In specific implementation, the basic compensation frequency multiples corresponding to each RO in the RO group are different. For example, the multiple relationships of each RO in the RO group are: (N-1)*fo, (N-2)*fo, ..., 1*fo, 0*fo; 0*fo, 1*fo, ..., (N-2)*fo, (N-1)*fo; or (N / 2)*fo, (N / 2-1)*fo, ..., 1*fo, 0*fo, -1*fo, ..., -(N / 2-1)*fo, where fo is the basic compensation frequency and N is the number of ROs in the RO group. This application, by adjusting the multiple difference (also known as the step size) of the basic compensation frequency between adjacent ROs, can carry real-time and high-precision frequency compensation when the terminal device sends random access information, thereby enabling network devices (such as base stations) to receive access information using a matching frequency.

[0074] In some implementations, the compensation frequency value sequence of the RO group is a linear sequence or a non-linear sequence, wherein the compensation frequency value sequence of the RO group is a sequence composed of the compensation frequency values ​​corresponding to each RO in the RO group.

[0075] In some implementations, the compensation frequency corresponding to each RO in the RO group is determined based on the basic compensation frequency associated with the RO group and the compensation frequency calculation rule. The compensation frequency calculation rule includes the basic compensation frequency. The compensation frequency calculation rule specifies the method for determining the basic compensation frequency multiple of each RO, for example, the basic compensation frequency multiples between adjacent ROs may be in an arithmetic progression, an arithmetic progression, a non-arithmetic progression, or a non-arithmetic progression relationship.

[0076] In some specific embodiments, the compensation frequency calculation rules include:

[0077] Rule 1: (N-1)*fo, (N-2)*fo,..., 1*fo, 0*fo;

[0078] Rule 2: 0*fo, 1*fo,..., (N-2)*fo, (N-1)*fo;

[0079] Rule 3: (N / 2)*fo, (N / 2-1)*fo,..., 1*fo, 0*fo,-1*fo,..., -(N / 2-1)*fo.

[0080] Where fo is the basic compensation frequency, and N is the number of ROs in the RO group. The above compensation frequency calculation rule is only an example; other compensation frequency calculation rules can be set in actual implementation.

[0081] Network device 102 is configured to receive multiple PRACH signals sent by terminal devices; determine an optimal dynamic compensation frequency based on the multiple PRACH signals; and send a random access response message indicating the optimal dynamic compensation frequency. Network device 102 may be located on a satellite or on the ground.

[0082] In practice, network device 102 can first receive each PRACH signal sequentially using conventional PRACH acquisition algorithms (such as matched filters and sliding correlation). Based on the reception performance of each PRACH signal, the optimal dynamic compensation frequency is determined. For example, the PRACH signal reception performance is when the matched filter output signal power is strongest or the correlation peak amplitude is largest. That is, the PRACH signal corresponding to the strongest matched filter output signal power or the largest correlation peak amplitude is determined as the optimal signal, and the optimal dynamic compensation frequency is determined based on the optimal signal.

[0083] It should be noted that the compensation frequency in this application can also be called the offset frequency, and the two have the same meaning. Network device 102 is, for example, a base station, a payload device, etc.

[0084] This embodiment improves the base station's performance in receiving random access information and enhances the uplink coverage and capacity / throughput of the NTN by referencing the random access information retransmission in the 3GPP standard specification and using the RO group to transmit PRACH signals with fine frequency compensation to the base station.

[0085] In some embodiments, for a given number N of PRACH repetitions (RO groups contain N ROs), if a time-domain offset parameter To is configured (e.g., in ROs as the counting unit), the starting ROs of two time-adjacent repetitions have the same frequency-domain starting point (starting RB or frequency-domain resource number) and are time-domain separated by To.

[0086] In some embodiments, when multiple PRACH repeat transmissions are configured, the RO group configurations used for each PRACH repeat transmission are different. For example, if two or more different numbers of PRACH repeat transmissions are configured, without loss of generality, taking repeat numbers N1 and N2 as examples, the repeat transmission of N1 uses an RO group containing N1 RO time-frequency resources, and the repeat transmission of N2 uses an RO group containing N2 RO time-frequency resources.

[0087] In some embodiments, when multiple PRACH repeat transmissions are configured, the compensation frequency corresponding to each RO in the RO group of multiple PRACH repeat transmissions is determined according to the basic compensation frequency associated with each RO group and the compensation frequency calculation rule.

[0088] The basic compensation frequencies associated with each RO group are different. Taking the number of repetitions N1 and N2 as an example, the RO group used for repetitive transmission of N1 can be associated with the first compensation frequency fo1, and the RO group used for repetitive transmission of N2 can be associated with the second compensation frequency fo2.

[0089] The compensation frequency calculation rules associated with each RO group may be the same or different, and the compensation frequency calculation rules include the basic compensation frequency.

[0090] In some implementations, for different numbers of PRACH repeat transmissions, a compensation frequency is configured for the time-frequency resources in the RO groups of different numbers of PRACH repeat transmissions using one of the compensation frequency calculation rules. For example, the compensation frequency for the time-frequency resources in the RO groups of different numbers of PRACH repeat transmissions is configured using the above-mentioned rules 1, 2, and 3.

[0091] In some implementations, various numbers of PRACH repeat transmissions are combined using one of the compensation frequency calculation rules to configure the compensation frequency for the time-frequency resources in the RO groups with various numbers of PRACH repeat transmissions. For example, the compensation frequency for the time-frequency resources in the RO groups with various numbers of PRACH repeat transmissions is configured using one of the above rules 1, 2, and 3.

[0092] For different numbers of PRACH repetitions, the terminal device adds the compensation frequency corresponding to each RO in the RO group associated with each number of PRACH repetitions to the frequency domain resources used for transmitting PRACH signals, and uses the corresponding frequency-compensated RO resources to transmit the PRACH signals. The method by which the network device determines the optimal dynamic compensation frequency is described in the foregoing embodiments and will not be detailed here.

[0093] In some embodiments, if N PRACH repeat transmissions are configured, the RO groups for PRACH repeat transmissions include multiple first RO groups. The terminal device adds a compensation frequency to the frequency domain resources used for transmitting PRACH signals according to the compensation frequency corresponding to each RO in each first RO group, and uses each first RO group to send frequency-compensated PRACH signals, that is, it uses the resources of the frequency-compensated first RO groups to send PRACH signals.

[0094] In practice, the RO group used for repeated transmission and its corresponding preamble are divided into two or more first RO groups in a certain way (e.g., according to the parity or size of the preamble sequence number). Each first RO group corresponds to a different compensation frequency (e.g., divided into two groups corresponding to fo1 and fo2 respectively).

[0095] The compensation frequency corresponding to each RO in each first RO group is determined based on the basic compensation frequency associated with each first RO group and the compensation frequency calculation rule. The basic compensation frequencies associated with each first RO group are different, and the compensation frequency calculation rules associated with each first RO group may be the same or different. The compensation frequency calculation rule includes the basic compensation frequency.

[0096] In some embodiments, for RO groups configured with time-domain periods, the time-domain period includes multiple SSB-RO association mode periods, and each association mode period includes one or more RO groups. For example, a time-domain period X includes K SSB-RO association mode periods, where X and K are positive integers, which can be preset, configured by the network side, or specified by the protocol. This application does not limit the specific values ​​of X and K. For example, a time-domain period of 480ms includes 3 SSB-RO association mode periods, that is, each association mode period is 160ms. As another example, a time-domain period of 80ms, with each SSB-RO association mode period being 20ms, includes a total of 4 association mode periods.

[0097] Within a single SSB-RO mapping association pattern period, there is at least one round of SSB-RO mapping, and each actually transmitted SSB corresponds to at least one RO. The SSB-RO mapping association pattern period is an integer multiple of the PRACH configuration period, as shown in Figure 15. The NR standard specification further defines the time-domain repetition period of the SSB-RO mapping association pattern period through the association pattern period. For example, when the PRACH configuration period is 10ms, the SSB-RO mapping association pattern period can be 1, 2, 4, 8, or 16 times the PRACH configuration period. Similarly, when the PRACH configuration period increases to 20ms, the set of values ​​for the SSB-RO mapping association pattern period multiples becomes 1, 2, 4, or 8 times the PRACH configuration period.

[0098] In some embodiments, the compensation frequency corresponding to each RO in one or more RO groups included in the same associated mode period is determined according to the basic compensation frequency associated with each RO group and the compensation frequency calculation rule. For a description of the basic compensation frequency and the compensation frequency calculation rule, please refer to the foregoing embodiments, and it will not be detailed here.

[0099] Among them, the basic compensation frequencies associated with RO groups in different association mode periods are different, and the calculation rules for the compensation frequencies associated with one or more RO groups in the same association mode period are the same or different. The calculation rules for the compensation frequencies include the basic compensation frequencies.

[0100] For example, if a PRACH repetitive transmission with a time-domain period of X is configured, then for K SSB-RO association mode periods within the time-domain period X, they can be associated with different basic compensation frequencies in a certain way. For example, when K=3, the first association mode period, the second association mode period, and the third association mode period are associated with the first basic compensation frequency fo1, the second basic compensation frequency fo2, and the third basic compensation frequency fo3, respectively. That is, the repetitive transmission RO group within the first association mode period is associated with the first basic compensation frequency fo1, the repetitive transmission RO group within the second association mode period is associated with the second basic compensation frequency fo2, and the repetitive transmission RO group within the third association mode period is associated with the third basic compensation frequency fo3. For the repetitive transmission RO group and RO resources within a certain association mode period, the UE adds a certain frequency compensation in the frequency domain and uses the RO group with frequency compensation to transmit the PRACH signal (i.e., uses the RO group to send the frequency-compensated PRACH signal). The network device determines the optimal dynamic compensation frequency for the terminal device for different association mode periods.

[0101] More specifically, for a PRACH repetitive transmission configured with a time-domain period of X, for the basic compensation frequencies (e.g., fo1, fo2, and fo3) associated with the repetitive transmission RO group in each associated mode period, one of the methods described in Rules 1, 2, and 3 above can be used independently to configure the corresponding compensation frequencies for the time-frequency resources (i.e., ROs) in their respective RO groups. Rules 1, 2, and 3 are merely illustrative examples; other methods may be chosen in specific implementations, and this application does not impose any limitations on them.

[0102] More specifically, for PRACH repetitive transmissions configured with a time-domain period of X, for the basic compensation frequencies (e.g., fo1, fo2, and fo3) associated with the repetitive transmission RO group in each associated mode period, one of the methods in Rule 1, Rule 2, and Rule 3 can be used in combination to configure the corresponding compensation frequencies for the time-frequency resources (i.e., ROs) in each RO group.

[0103] In some embodiments, within a time-domain period X, a set of RO groups is determined or configured for transmitting a configured number of PRACHs. The determined or configured set of RO groups repeats in each time-domain period X. The time-domain period X contains K SSB-RO association mode periods, and the RO groups correspond to different basic compensation frequencies when applied in each association mode period.

[0104] In some embodiments, if a PRACH repetition transmission with a time domain period of X and a number of N is configured, where X and N are positive integers and can be pre-configured, when each SSB has two or more RO groups corresponding to it in the time domain period X, i.e., the same SSB is associated with multiple second RO groups, then a compensation frequency is added to the frequency domain resources used for transmitting PRACH signals according to the compensation frequency corresponding to each RO in each second RO group. For example, if the time domain period is 80ms, then there are multiple second RO groups within 80ms.

[0105] In detail, the compensation frequency corresponding to each RO in each second RO group is determined based on the basic compensation frequency associated with each second RO group and the compensation frequency calculation rule. The basic compensation frequencies associated with each second RO group are different, and the compensation frequency calculation rules associated with each second RO group may be the same or different. The compensation frequency calculation rule includes the basic compensation frequency.

[0106] In practice, different basic compensation frequencies can be associated with different RO groups (i.e., each second RO group) in a certain way. For example, they can be associated with different basic compensation frequencies according to the RO group number (different RO groups corresponding to the same SSB are ordered sequentially in the time domain first and then the frequency domain). For example, RO group #1 is associated with basic compensation frequency fo1, RO group #2 is associated with basic compensation frequency fo2, and so on. For each SSB, the selected repetitive transmission RO group and RO resources in the time domain period X, the UE can use one of the methods in rule 1, rule 2, and rule 3 above to determine the compensation frequency corresponding to each RO in the RO group, add a certain frequency offset in the frequency domain, and use the RO group with the frequency offset to transmit PRACH signals. The network equipment determines the optimal dynamic compensation frequency for the terminal equipment for different RO groups.

[0107] In some embodiments, the terminal device 101 also receives indication information from the network device 102, the indication information being used to indicate RO group information and / or time-domain periodic RO group information for PRACH repetitive transmission, as well as frequency compensation information for the RO group.

[0108] In detail, the RO group information for repeated transmissions includes the number of repeated transmissions and the RO group information for each number of repeated transmissions.

[0109] The RO group information in the time domain period includes the number of SSB-RO association mode periods in the time domain period and the associated RO group information in each SSB.

[0110] The frequency compensation information for the RO group includes the basic compensation frequency and the calculation method for the compensation frequency, or the corresponding indication code. The calculation method for the compensation frequency includes, for example, the step value of the basic compensation frequency between adjacent ROs under various scenarios, such as the terminal device approaching the satellite, moving away from the satellite, or passing overhead. The terminal device can select the corresponding basic compensation frequency and step value according to the selected scenario.

[0111] In implementation, the indication information of network device 102 may be included in one or more indication information such as main system information MIB, auxiliary system information SIB, RRC configuration information, and DCI scheduling information. It may pre-indicate the compensation frequency configuration and related correspondence of PRACH resources (related to PRACH repetitive transmission, or related to RO and RO group) and preamble in the terminal device in some way, for example, by the base station and terminal device according to the pre-agreed configuration parameters, domain codes, etc. (e.g., new domains or reused existing domains in system message 1 (SIB1) and / or SIB19 and / or SIB23).

[0112] Network device 102 captures multiple frequency-compensated PRACH signals and obtains the optimal dynamic compensation frequency fp based on the acquired multiple PRACH signals. In the response information during the access process, such as message 2 (MSG2) and / or message 4 (MSG4), network device 102 indicates the optimal dynamic compensation frequency fp to the terminal device in some way, such as through instructions from the network device and the terminal device based on pre-agreed configuration parameters, domain codes, etc.

[0113] In some embodiments, the terminal device 101 is further configured to receive a random access response message from the network device. If no random access response message is received within a preset time period, the compensation frequency corresponding to each RO in the RO group is re-determined, and the addition of compensation frequency to the frequency domain resources used for transmitting the PRACH signal is re-executed, and the frequency-compensated PRACH signal is retransmitted. In specific implementation, for each RO group, when re-determining the compensation frequency corresponding to each RO in the RO group, the sequence of compensation frequency values ​​for the RO group is different compared to the last time the compensation frequency corresponding to each RO in the RO group was determined. For example, the basic compensation frequency used is different, and / or the compensation frequency calculation rule used is different, etc.

[0114] This embodiment enables network devices to determine the optimal dynamic compensation frequency, thereby allowing network devices (base stations) to receive access information using a matching frequency and obtain better reception performance.

[0115] Second aspect of the embodiments

[0116] In some embodiments, a random access method is also provided, applied to a terminal device. Specifically, as shown in Figure 2, the random access method applied to the terminal device includes:

[0117] 201. Based on the compensation frequency corresponding to each RO in the RO group, add a compensation frequency to the frequency domain resources used for transmitting PRACH signals.

[0118] 202, Use the RO group to send a frequency-compensated PRACH signal.

[0119] One RO group corresponds to a multiple number of PRACH repetitions. The compensation frequency for each RO in the RO group is a multiple of the basic compensation frequency, and the compensation frequency for each RO is different, meaning the multiple of the corresponding basic compensation frequency is variable. Furthermore, the compensation frequency value sequence of the RO group is either a linear or non-linear sequence, where the compensation frequency value sequence of the RO group is a sequence composed of the compensation frequency values ​​corresponding to each RO in the RO group. In specific implementation, the basic compensation frequency can be configured by the network device side; this application does not limit its specific value.

[0120] After receiving the PRACH signal, the network device determines the optimal dynamic compensation frequency based on the received PRACH signal and sends a random access response message indicating that it is still at the optimal dynamic compensation frequency.

[0121] This application combines the random access time group (RO group) with PRACH transmit frequency compensation, enabling terminal devices to carry real-time and high-precision frequency compensation when sending random access information. This allows network devices (base stations) to receive access information using a matching frequency, resulting in better reception performance.

[0122] In some embodiments, the compensation frequency corresponding to each RO in the RO group is determined according to the basic compensation frequency associated with the RO group and the compensation frequency calculation rule, wherein the compensation frequency calculation rule is a rule that includes the basic compensation frequency.

[0123] The process of determining the compensation frequency of each RO in the RO group based on the basic compensation frequency and the compensation frequency calculation rules can be referred to the aforementioned embodiments, and will not be described in detail here.

[0124] In some embodiments, when configuring multiple PRACH repeat transmissions, the RO groups used for each PRACH repeat transmission are different. The compensation frequency corresponding to each RO in each RO group is determined based on the basic compensation frequency associated with each RO group and the compensation frequency calculation rules.

[0125] Among them, the basic compensation frequency associated with each RO group is different, and the calculation rules for the compensation frequency associated with each RO group may be the same or different. The calculation rules for the compensation frequency include the basic compensation frequency.

[0126] In some embodiments, when configuring one or more PRACH repeat transmissions, at least one of the PRACH repeat transmissions includes multiple first RO groups in the RO group. Based on the compensation frequency corresponding to each RO in each first RO group, a compensation frequency is added to the frequency domain resources used for transmitting PRACH signals, and the frequency-compensated PRACH signals are transmitted using the corresponding RO.

[0127] In practice, the compensation frequency corresponding to each RO in each first RO group is determined according to the basic compensation frequency associated with each first RO group and the compensation frequency calculation rules.

[0128] Among them, the basic compensation frequency associated with each first RO group is different, and the calculation rules for the compensation frequency associated with each first RO group are the same or different. The calculation rules for the compensation frequency include the basic compensation frequency.

[0129] In some embodiments, for a RO group with a configured time-domain period, the time-domain period includes multiple SSB-RO association mode periods, and each association mode period includes one or more RO groups.

[0130] Specifically, the compensation frequency for each RO in one or more RO groups within the same associated pattern period is determined based on the basic compensation frequency and compensation frequency calculation rules of each RO group association.

[0131] Among them, the basic compensation frequencies associated with RO groups in different association mode periods are different, and the calculation rules for the compensation frequencies associated with one or more RO groups in the same association mode period are the same or different. The calculation rules for the compensation frequencies include the basic compensation frequencies.

[0132] In some embodiments, for RO groups configured with time-domain periods, the time-domain period includes multiple SSB-RO association mode periods, and the same SSB is associated with multiple second RO groups.

[0133] When applied to the random access method on the terminal device side, for each SSB-RO association mode cycle, according to the compensation frequency corresponding to each RO in each second RO group associated with the SSB, a compensation frequency is added to the frequency domain resources used for transmitting PRACH signals, and the frequency-compensated PRACH signals are transmitted using the second RO group.

[0134] In detail, the compensation frequency corresponding to each RO in each second RO group is determined based on the basic compensation frequency associated with each second RO group and the compensation frequency calculation rules;

[0135] Among them, the basic compensation frequency associated with each second RO group is different, and the calculation rules for the compensation frequency associated with each second RO group are the same or different. The calculation rules for the compensation frequency include the basic compensation frequency.

[0136] In some embodiments, as shown in FIG3, the random access method applied to the terminal device side further includes:

[0137] 301, Receive indication information from the network device, the indication information being used to indicate RO group information and / or time-domain periodic RO group information for PRACH repetitive transmission, as well as frequency compensation information for the RO group.

[0138] In some embodiments, as shown in FIG4, the random access method applied to the terminal device side includes:

[0139] 401. Based on the compensation frequency corresponding to each RO in the RO group, add a compensation frequency to the frequency domain resources used for transmitting PRACH signals.

[0140] 402, Use the RO group to send a frequency-compensated PRACH signal.

[0141] 403, receive random access response message from network device.

[0142] 404. If no random access response message is received within the preset time period, proceed to step 405. If a random access response message is received within the preset time period, the subsequent steps of the access process can be executed.

[0143] 405. Redetermine the compensation frequency corresponding to each RO in the RO group, and return to step 401 to repeat the execution.

[0144] Third aspect of the embodiments

[0145] In some embodiments, a random access method applied to the network device side is also provided, as shown in FIG5. The random access method applied to the network device side includes:

[0146] 501, receiving multiple PRACH signals sent by the terminal device, wherein the frequency domain resources used to transmit the PRACH signals are supplemented with a compensation frequency.

[0147] 502. Determine the optimal dynamic compensation frequency based on multiple PRACH signals.

[0148] 503, send a response message indicating the optimal dynamic compensation frequency.

[0149] Among them, for a certain number of RPACH repeated transmissions, the repeated transmission RO group contains N RO time-frequency resources, and the network device determines the optimal dynamic compensation frequency for this number of terminals according to 501 to 503 above.

[0150] For configurations of multiple numbers of RPACH repetitions, the network device determines the optimal dynamic compensation frequency for each number of RPACH repetitions according to steps 501 to 503. For example, if the number of repetitions is N1 and N2, and the repetition RO group contains N1 or N2 RO time-frequency resources, then the network device determines the optimal dynamic compensation frequency for terminals with numbers of N1 and / or N2 according to steps 501 to 503 above.

[0151] For PRACH repetitive transmissions configured with a time-domain period X, the time-domain period X contains K SSB-RO association mode periods, and each association mode period contains one or more RO groups. The network device determines the optimal dynamic compensation frequency for the terminal under each association mode period according to 501 to 503 above.

[0152] For a certain number of RPACH repetitions, the RO groups used for repetitions and their corresponding preambles are divided into two or more groups in a certain way (e.g., according to the parity or size of the preamble sequence number). Then, the network device determines the optimal dynamic compensation frequency for the terminal for different preamble groups according to 501 to 503 above.

[0153] For a PRACH repetitive transmission configured with a time domain period X and a number of N, the time domain period X contains K SSB-RO association mode periods. Each SSB has two or more RO groups corresponding to it within the time domain period X. Then, the network device determines the optimal dynamic compensation frequency for the terminal for different RO groups of the SSB according to the above 501 to 503.

[0154] In some embodiments, as shown in FIG6, the random access method applied to the network device side further includes:

[0155] 601, Send indication information to the terminal device, wherein the indication information is used to indicate the RO group information and / or the time domain period of the RO group for PRACH repeated transmission, as well as the frequency compensation information of the RO group.

[0156] Fourth aspect of the embodiment

[0157] In some embodiments, a random access device applied to the terminal device side is also provided, as shown in FIG7, the random access device applied to the terminal device side includes:

[0158] Processing unit 701 is configured to add a compensation frequency to the frequency domain resources used for transmitting PRACH signals according to the compensation frequency corresponding to each RO in the RO group.

[0159] Transmitting unit 702 is configured to transmit a frequency-compensated PRACH signal using the RO group.

[0160] In some embodiments, the compensation frequency corresponding to each RO in the RO group is a multiple of the basic compensation frequency; and / or

[0161] The compensation frequency value sequence of the RO group can be a linear sequence or a nonlinear sequence. The compensation frequency value sequence of the RO group is a sequence composed of the compensation frequency values ​​corresponding to each RO in the RO group.

[0162] In some embodiments, the compensation frequency corresponding to each RO in the RO group is determined according to the basic compensation frequency associated with the RO group and the compensation frequency calculation rule, wherein the compensation frequency calculation rule is a rule that includes the basic compensation frequency.

[0163] In some embodiments, when multiple PRACH repeat transmissions are configured, the RO group configurations used for each PRACH repeat transmission are different.

[0164] Among them, the compensation frequency corresponding to each RO in each RO group is determined according to the basic compensation frequency associated with each RO group and the compensation frequency calculation rules;

[0165] Among them, the basic compensation frequency associated with each RO group is different, and the calculation rules for the compensation frequency associated with each RO group may be the same or different. The calculation rules for the compensation frequency include the basic compensation frequency.

[0166] In some embodiments, the RO group includes a plurality of first RO groups, and the processing unit is configured to add a compensation frequency to the frequency domain resources used for transmitting PRACH signals according to the compensation frequency corresponding to each RO in each first RO group.

[0167] Among them, the compensation frequency corresponding to each RO in each first RO group is determined according to the basic compensation frequency associated with each first RO group and the compensation frequency calculation rules;

[0168] Among them, the basic compensation frequency associated with each first RO group is different, and the calculation rules for the compensation frequency associated with each first RO group are the same or different. The calculation rules for the compensation frequency include the basic compensation frequency.

[0169] In some embodiments, for a RO group with a configured time-domain period, the time-domain period includes multiple SSB-RO association mode periods, and each association mode period includes one or more RO groups.

[0170] Among them, the compensation frequency of each RO in one or more RO groups included in the same association mode period is determined according to the basic compensation frequency and compensation frequency calculation rules of each RO group association.

[0171] Among them, the basic compensation frequencies associated with RO groups in different association mode periods are different, and the calculation rules for the compensation frequencies associated with one or more RO groups in the same association mode period are the same or different. The calculation rules for the compensation frequencies include the basic compensation frequencies.

[0172] In some embodiments, the same SSB is associated with multiple second RO groups;

[0173] The processing unit is configured to add a compensation frequency to the frequency domain resources used for transmitting PRACH signals according to the compensation frequency corresponding to each RO in each second RO group.

[0174] Among them, the compensation frequency corresponding to each RO in each second RO group is determined according to the basic compensation frequency associated with each second RO group and the compensation frequency calculation rules;

[0175] Among them, the basic compensation frequency associated with each second RO group is different, and the calculation rules for the compensation frequency associated with each second RO group are the same or different. The calculation rules for the compensation frequency include the basic compensation frequency.

[0176] In some embodiments, as shown in FIG8, the random access device applied to the terminal device side further includes:

[0177] The first receiving unit 703 is configured to receive indication information from the network device. The indication information is used to indicate RO group information and / or time-domain periodic RO group information for PRACH repetitive transmission, as well as frequency compensation information of the RO group.

[0178] In some embodiments, as shown in FIG9, the random access device applied to the terminal device side further includes:

[0179] The second receiving unit 704 is configured to receive random access response messages from the network device.

[0180] The processing unit 701 is also configured to, if no random access response message is received within a preset time period, redetermine the compensation frequency corresponding to each RO in the RO group, re-execute the addition of compensation frequency to the frequency domain resources used for transmitting PRACH signals, and re-transmit the frequency-compensated PRACH signals using the transmitting unit 702.

[0181] It is worth noting that the above description only covers the components or modules relevant to this application, but this application is not limited thereto. The random access device applied to the terminal device side in the embodiments of this application may also include other components or modules. For details regarding these components or modules, please refer to related technologies.

[0182] Furthermore, for simplicity, Figures 7-9 only illustrate the connection relationships or signal flows between the various components or modules, but those skilled in the art should understand that various related technologies such as bus connections can be used. The aforementioned components or modules can be implemented using hardware facilities such as processors, memory, transmitters, and receivers; this application does not limit this implementation.

[0183] The above embodiments are merely illustrative examples of embodiments of this application, but this application is not limited thereto, and appropriate modifications can be made based on the above embodiments. For example, the above embodiments can be used alone, or one or more of the above embodiments can be combined.

[0184] Fifth aspect of the embodiment

[0185] In some embodiments, a random access device for use on a network device side is also provided, as shown in FIG10. The random access device for use on a network device includes:

[0186] The receiving unit 1001 is configured to receive multiple PRACH signals sent by the terminal device, and the frequency domain resources used to transmit the PRACH signals are supplemented with a compensation frequency.

[0187] Processing unit 1002 is configured to determine the optimal dynamic compensation frequency based on the plurality of PRACH signals.

[0188] The first transmitting unit 1003 is configured to transmit a response message indicating the optimal dynamic compensation frequency.

[0189] In some embodiments, as shown in FIG11, the random access device applied to the network device side further includes:

[0190] The second transmitting unit 1004 is configured to transmit indication information to the terminal device. The indication information is used to indicate RO group information and / or time-domain periodic RO group information for PRACH repetitive transmission, as well as frequency compensation information of the RO group.

[0191] It is worth noting that the above description only covers the components or modules relevant to this application, but this application is not limited thereto. The random access device applied to the network device side in the embodiments of this application may also include other components or modules; for details regarding these components or modules, please refer to related technologies.

[0192] Furthermore, for simplicity, Figures 10 and 11 only illustrate the connection relationships or signal flows between the various components or modules, but those skilled in the art should understand that various related technologies such as bus connections can be used. The aforementioned components or modules can be implemented using hardware facilities such as processors, memory, transmitters, and receivers; this application does not limit this implementation.

[0193] The above embodiments are merely illustrative examples of embodiments of this application, but this application is not limited thereto, and appropriate modifications can be made based on the above embodiments. For example, the above embodiments can be used alone, or one or more of the above embodiments can be combined.

[0194] In summary, this application addresses how a terminal device can carry real-time and high-precision frequency compensation when sending random access information, enabling the base station to receive access information at a matching frequency and achieve better reception performance. This application is applicable to high-dynamic NTN scenarios. When a UE uses PRACH retransmission to implement enhanced initial access, it proposes flexibly pre-setting a set of real-time and high-precision frequency offsets (compensations) in each PRACH repeatedly transmitted on RO group resources. This allows network devices (e.g., base stations) to receive access information at a matching frequency to achieve better reception performance. The application also indicates the optimal offset (compensation) frequency to the terminal device, allowing the UE to use an appropriate frequency offset for information transmission, thereby improving reception performance.

[0195] This application combines the random access timing group method with PRACH transmit frequency compensation, and provides specific details accordingly. The compensation (offset) frequencies involved in this application are described based on the initial compensation (i.e., calculated above based on ephemeris and its own position).

[0196] This application also provides a terminal device, but the application is not limited to this and other devices may also be used.

[0197] Figure 12 is a schematic diagram of a terminal device according to an embodiment of this application. As shown in Figure 12, the terminal device 1200 may include a processor 1210 and a memory 1220; the memory 1220 stores data and programs and is coupled to the processor 1210. It is worth noting that this figure is exemplary; other types of structures may also be used to supplement or replace this structure to implement telecommunications functions or other functions.

[0198] For example, the processor 1210 can be configured to execute a program to implement a random access method applied to the terminal device side.

[0199] As shown in Figure 12, the terminal device 1200 may further include: a communication module 1230, an input unit 1240, a display 1250, and a power supply 1260. The functions of these components are similar to those in the prior art and will not be described in detail here. It is worth noting that the terminal device 1200 does not necessarily include all the components shown in Figure 12; these components are not essential. Furthermore, the terminal device 1200 may also include components not shown in Figure 12, which can be referred to in the prior art.

[0200] This application also provides a network device, such as a base station, but this application is not limited to this and may also include other network devices.

[0201] Figure 13 shows a schematic diagram of the network device according to an embodiment of this application. As shown in Figure 13, the network device 1300 may include: a processor 1310 (e.g., a central processing unit CPU) and a memory 1320; the memory 1320 is coupled to the processor 1310. The memory 1320 can store various data; in addition, it also stores an information processing program 1330, and executes the program 1330 under the control of the processor 1310.

[0202] For example, the processor 1310 can be configured to execute a program to implement the random access method described above for use on the network device side.

[0203] In addition, as shown in Figure 13, network device 1300 may also include a transceiver 1340 and an antenna 1350, etc.; the functions of the above components are similar to those in the prior art, and will not be described in detail here. It is worth noting that network device 1300 does not necessarily have to include all the components shown in Figure 13; in addition, network device 1300 may also include components not shown in Figure 13, which can be referred to in the prior art.

[0204] Figure 14 illustrates a schematic diagram of a random access procedure according to an embodiment of this application, using a 4-step CBRA as an example. As shown in Figure 14, the method includes:

[0205] 1401. The UE adds a compensation frequency to the frequency domain resources used for transmitting PRACH signals according to the compensation frequency corresponding to each RO in the RO group. That is, each time-frequency resource (RO) in the RO group is used to transmit PRACH signals after frequency compensation, and sends a random access preamble (Msg1) to the gNB.

[0206] Wherein, the compensation frequency corresponding to each RO in the RO group is a multiple of the basic compensation frequency; and / or

[0207] The compensation frequency value sequence of the RO group is a linear sequence or a nonlinear sequence, wherein the compensation frequency value sequence of the RO group is a sequence composed of the compensation frequency values ​​corresponding to each RO in the RO group.

[0208] 1402, The network device receives multiple PRACH signals sent by the terminal device; determines the optimal dynamic compensation frequency based on the multiple PRACH signals; sends a random access response message indicating the optimal dynamic compensation frequency; and sends a random access response (RAR) message indicating the optimal dynamic compensation frequency (Msg2) to the terminal device.

[0209] 1403, the UE sends a connection request message (Schedule Transmission) (Msg3) on the acquired uplink resources;

[0210] 1404, the network device sends a Contention Resolution message (Msg4) to the UE that has successfully accessed the network.

[0211] In some embodiments, other operations may also be included, the specific implementation of which can be referred to the foregoing embodiments, and the same content will not be repeated.

[0212] In some embodiments, 1402 to 1404 are similar to the prior art, and will not be described in detail here.

[0213] This application also provides a computer-readable program, wherein when the program is executed in a random access device or network device, the program causes the computer to perform the aforementioned random access method on the network device side, i.e., the method of the third aspect embodiment.

[0214] This application also provides a storage medium storing a computer-readable program, wherein the computer-readable program causes a computer to execute the aforementioned random access method on the network device side in a random access or network device, namely the method of the third aspect embodiment.

[0215] This application also provides a computer-readable program, wherein when the program is executed in a signal random access device or terminal device, the program causes the computer to execute the aforementioned random access method on the terminal device side in the random access device or terminal device, i.e., the method of the second aspect embodiment.

[0216] This application also provides a storage medium storing a computer-readable program, wherein the computer-readable program causes a computer to execute the aforementioned random access method on the terminal device side in a random access device or terminal device, namely the method of the second aspect embodiment.

[0217] The apparatus and methods described above in this application can be implemented in hardware or in combination with software. This application relates to a computer-readable program that, when executed by a logic component, enables the logic component to implement the apparatus or components described above, or to implement the various methods or steps described above. Logic components include, for example, field-programmable logic devices (FPGAs), microprocessors, and processors used in computers. This application also relates to storage media for storing the above programs, such as hard disks, magnetic disks, optical disks, DVDs, and flash memory.

[0218] The methods / apparatus described in conjunction with the embodiments of this application can be directly embodied in hardware, software modules executed by a processor, or a combination of both. For example, one or more and / or combinations of one or more functional block diagrams shown in the figures can correspond to various software modules in a computer program flow, or to various hardware modules. These software modules can correspond to the various steps shown in the figures, respectively. These hardware modules can be implemented, for example, using a field-programmable gate array (FPGA) to embed these software modules.

[0219] The software module can reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. A storage medium can be coupled to the processor, enabling the processor to read information from and write information to the storage medium; or the storage medium can be an integral part of the processor. The processor and storage medium can reside in an ASIC. The software module can be stored in the memory of a mobile terminal or in a memory card that can be inserted into the mobile terminal. For example, if the device (such as a mobile terminal) uses a high-capacity MEGA-SIM card or a high-capacity flash memory device, the software module can be stored in the MEGA-SIM card or the high-capacity flash memory device.

[0220] One or more and / or one or more combinations of functional blocks described in the accompanying drawings can be implemented as a general-purpose processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, or any suitable combination thereof for performing the functions described herein. One or more and / or one or more combinations of functional blocks described in the accompanying drawings can also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in communication with a DSP, or any other such configuration.

[0221] The present application has been described above with reference to specific embodiments. However, those skilled in the art should understand that these descriptions are exemplary and not intended to limit the scope of protection of the present application. Those skilled in the art can make various modifications and variations to the present application based on its spirit and principles, and these modifications and variations are also within the scope of the present application.

Claims

1. A random access device, wherein, For use in terminal devices, including: The processing unit is configured to add a compensation frequency to the frequency domain resources used for transmitting PRACH signals according to the compensation frequency corresponding to each RO in the RO group. A transmitting unit configured to transmit a frequency-compensated PRACH signal using the RO group.

2. The apparatus of claim 1, wherein, The compensation frequency corresponding to each RO in the RO group is a multiple of the basic compensation frequency; and / or The compensation frequency value sequence of the RO group is a linear sequence or a nonlinear sequence, wherein the compensation frequency value sequence of the RO group is a sequence composed of the compensation frequency values ​​corresponding to each RO in the RO group.

3. The apparatus of claim 1, wherein, The compensation frequency corresponding to each RO in the RO group is determined according to the basic compensation frequency associated with the RO group and the compensation frequency calculation rule, wherein the compensation frequency calculation rule includes the basic compensation frequency.

4. The apparatus of claim 1, wherein, When configuring multiple PRACH repeat transmissions, the RO group configurations used for each PRACH repeat transmission are different. The compensation frequency corresponding to each RO in each RO group is determined according to the basic compensation frequency associated with each RO group and the compensation frequency calculation rules. Among them, the basic compensation frequency associated with each RO group is different, and the calculation rules for the compensation frequency associated with each RO group may be the same or different. The calculation rules for the compensation frequency include the basic compensation frequency.

5. The apparatus according to any one of claims 1 to 4, wherein, The RO group includes multiple first RO groups, and the processing unit is configured to add a compensation frequency to the frequency domain resources used for transmitting PRACH signals according to the compensation frequency corresponding to each RO in each first RO group.

6. The apparatus of claim 5, wherein, The compensation frequency corresponding to each RO in each first RO group is determined based on the basic compensation frequency associated with each first RO group and the compensation frequency calculation rules. Among them, the basic compensation frequency associated with each first RO group is different, and the calculation rules for the compensation frequency associated with each first RO group are the same or different. The calculation rules for the compensation frequency include the basic compensation frequency.

7. The apparatus of claim 1, wherein, For RO groups configured with time-domain periods, the time-domain period contains multiple SSB-RO association mode periods, and each association mode period contains one or more RO groups. Among them, the compensation frequency of each RO in one or more RO groups included in the same association mode period is determined according to the basic compensation frequency and compensation frequency calculation rules of each RO group association. Among them, the basic compensation frequencies associated with RO groups in different association mode periods are different, and the calculation rules for the compensation frequencies associated with one or more RO groups in the same association mode period are the same or different. The calculation rules for the compensation frequencies include the basic compensation frequencies.

8. The apparatus of claim 1, wherein, The same SSB is associated with multiple second RO groups; The processing unit is configured to add a compensation frequency to the frequency domain resources used for transmitting PRACH signals according to the compensation frequency corresponding to each RO in each second RO group.

9. The apparatus of claim 8, wherein, The compensation frequency corresponding to each RO in each second RO group is determined based on the basic compensation frequency associated with each second RO group and the compensation frequency calculation rules. Among them, the basic compensation frequency associated with each second RO group is different, and the calculation rules for the compensation frequency associated with each second RO group are the same or different. The calculation rules for the compensation frequency include the basic compensation frequency.

10. The apparatus according to any one of claims 1 to 9, wherein, Also includes: A first receiving unit is configured to receive indication information from a network device, the indication information being used to indicate RO group information and / or time-domain periodic RO group information for PRACH repetitive transmission, as well as frequency compensation information for the RO group.

11. The apparatus according to any one of claims 1 to 9, wherein, Also includes: The second receiving unit is configured to receive random access response messages from the network device. The processing unit is further configured to, if no random access response message is received within a preset time period, redetermine the compensation frequency corresponding to each RO in the RO group, re-execute the addition of compensation frequency to the frequency domain resources used for transmitting PRACH signals, and re-transmit the frequency-compensated PRACH signals using the transmitting unit.

12. A random access device, wherein, Applied to network devices, including: The receiving unit is configured to receive multiple PRACH signals sent by the terminal device, wherein the frequency domain resources used for transmitting the PRACH signals are supplemented with a compensation frequency. A processing unit configured to determine an optimal dynamic compensation frequency based on the plurality of PRACH signals; The first sending unit is configured to send a random access response message indicating the optimal dynamic compensation frequency.

13. The apparatus of claim 12, wherein, Also includes: The second transmitting unit is configured to transmit indication information to the terminal device. The indication information is used to indicate RO group information and / or time-domain periodic RO group information for PRACH repetitive transmission, as well as frequency compensation information of the RO group.

14. A random access method, wherein, For use in terminal devices, including: Based on the compensation frequency corresponding to each RO in the RO group, a compensation frequency is added to the frequency domain resources used for transmitting PRACH signals. The RO group is used to transmit a frequency-compensated PRACH signal.

15. The method of claim 14, wherein, The compensation frequency corresponding to each RO in the RO group is a multiple of the basic compensation frequency; and / or The compensation frequency value sequence of the RO group is a linear sequence or a nonlinear sequence, wherein the compensation frequency value sequence of the RO group is a sequence composed of the compensation frequency values ​​corresponding to each RO in the RO group.

16. The method of claim 14, wherein, The compensation frequency corresponding to each RO in the RO group is determined according to the basic compensation frequency associated with the RO group and the compensation frequency calculation rule, wherein the compensation frequency calculation rule includes the basic compensation frequency.

17. The method as described in claim 14, wherein when configuring multiple PRACH repeat transmissions, the RO groups used for PRACH repeat transmissions are different, and the compensation frequency corresponding to each RO in each RO group is determined according to the basic compensation frequency associated with each RO group and the compensation frequency calculation rule. in, The basic compensation frequencies associated with each RO group are different, and the calculation rules for the compensation frequencies associated with each RO group may be the same or different. The calculation rules for the compensation frequencies include the basic compensation frequencies.

18. The method as claimed in any one of claims 14 to 17, wherein, The RO group includes multiple first RO groups. Based on the compensation frequency corresponding to each RO in each first RO group, a compensation frequency is added to the frequency domain resources used for transmitting PRACH signals.

19. The method of claim 18, wherein, The compensation frequency corresponding to each RO in each first RO group is determined based on the basic compensation frequency associated with each first RO group and the compensation frequency calculation rules. Among them, the basic compensation frequency associated with each first RO group is different, and the calculation rules for the compensation frequency associated with each first RO group are the same or different. The calculation rules for the compensation frequency include the basic compensation frequency.

20. The method of claim 14, wherein, Also includes: For RO groups configured with time-domain periods, the time-domain period contains multiple SSB-RO association mode periods, and each association mode period contains one or more RO groups. Among them, the compensation frequency of each RO in one or more RO groups included in the same association mode period is determined according to the basic compensation frequency and compensation frequency calculation rules of each RO group association. Among them, the basic compensation frequencies associated with RO groups in different association mode periods are different, and the calculation rules for the compensation frequencies associated with one or more RO groups in the same association mode period are the same or different. The calculation rules for the compensation frequencies include the basic compensation frequencies.

21. The method of claim 14, wherein, The same SSB is associated with multiple second RO groups; Based on the compensation frequency corresponding to each RO in each second RO group, a compensation frequency is added to the frequency domain resources used for transmitting PRACH signals.

22. The method of claim 21, wherein, The compensation frequency corresponding to each RO in each second RO group is determined based on the basic compensation frequency associated with each second RO group and the compensation frequency calculation rules. Among them, the basic compensation frequency associated with each second RO group is different, and the calculation rules for the compensation frequency associated with each second RO group are the same or different. The calculation rules for the compensation frequency include the basic compensation frequency.

23. The method as described in any one of claims 14 to 22, wherein, Also includes: The network device receives indication information, which is used to indicate RO group information and / or time-domain periodic RO group information for PRACH repetitive transmission, as well as frequency compensation information for the RO group.

24. The method as described in any one of claims 14 to 22, wherein, Also includes: Receive random access response messages from network devices; If no random access response message is received within the preset time period, the compensation frequency corresponding to each RO in the RO group is re-determined, and the compensation frequency is re-applied to the frequency domain resources used for transmitting the PRACH signal, and the frequency-compensated PRACH signal is sent again.

25. A random access method, wherein, Applied to network devices, including: The receiving terminal device sends multiple PRACH signals, and the frequency domain resources used to transmit the PRACH signals are supplemented with compensation frequencies. Determine the optimal dynamic compensation frequency based on the multiple PRACH signals; Send a random access response message indicating the optimal dynamic compensation frequency.

26. The method of claim 25, wherein, Also includes: Send indication information to the terminal device. The indication information is used to indicate the RO group information and / or the time domain period of the RO group for PRACH repeated transmission, as well as the frequency compensation information of the RO group.

27. A terminal device, comprising a processor and a memory, wherein the memory stores a program, wherein The processor is configured to implement the random access method according to any one of claims 14 to 24 when executing the program.

28. A network device comprising a processor and a memory, the memory storing a program, wherein, The processor is configured to implement the random access method of any one of claims 25 to 26 when executing the program.

29. A communication system, wherein, include: Terminal equipment and network equipment; The terminal device is configured to perform the random access method according to any one of claims 14 to 24; The network device is configured to perform the random access method as described in any one of claims 25 to 26.

30. A computer-readable storage medium storing a computer-readable program, wherein, When the computer-readable program is executed by the processor of a computer, it implements the random access method according to any one of claims 14 to 26.

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