Uplink signal resource configuration method and user equipment

Abstract

Provided are a method for configuring resources of an uplink signal and a user equipment. The method for configuring resources of an uplink signal comprises: obtaining configuration of random access resources of two-step random access and data resources of two-step random access based on resource configuration information of the uplink signal; and determining a mapping relationship between the random access resources of two-step random access and data resources of two-step random access based on a predetermined mapping mode between the random access resources of two-step random access and the data resources of two-step random access.

Description

Technical Field

[0001] The present application relates to the technical field of wireless communication systems, and more specifically, to a resource configuration method for uplink signals and user equipment. Background Art

[0002] The transmission in the wireless communication system includes: the transmission from the base station (BS) to the user equipment (UE) (called downlink transmission), and the corresponding time slot is called the downlink time slot; the transmission from the user equipment to the base station (called uplink transmission), and the corresponding time slot is called the uplink time slot.

[0003] In the downlink transmission of the wireless communication system, the wireless communication system can periodically send the synchronization signal and the broadcast channel to the user through the synchronization signal block (SSB and / or PBCH block), and the period is the SSB period or the SSB group period (SSBburst periodicity). At the same time, the base station can configure the physical random access channel (PRACH) configuration period, configure a specific number of random access transmission opportunities (also called random access opportunities, PRACH transmissionoccasion, RO) in the configuration period, and satisfy that all synchronization signal blocks can be mapped to the corresponding random access transmission opportunities within the mapping period (i.e., a specific time length).

[0004] In the new radio (NR) communication system, before the radio resource control is established, for example, during the random access process, the performance of random access directly affects the user experience. In traditional wireless communication systems, such as LTE and LTE-Advanced, the random access process is applied to multiple scenarios such as establishing an initial link, cell switching, reestablishing an uplink link, and reestablishing a radio resource control (RRC) connection, and is divided into contention-based random access and non-contention-based random access according to whether the user has exclusive preamble resources. Since in contention-based random access, each user selects a preamble from the same preamble resource in the process of trying to establish an uplink, multiple users may select the same preamble to send to the base station. Therefore, the conflict resolution mechanism is an important research direction for random access. How to reduce the probability of conflict and how to quickly resolve conflicts that have occurred are key indicators that affect the performance of random access.

[0005] In a mobile communication system such as LTE-A, the contention-based random access process can be divided into four steps. In the first step, the user randomly selects a preamble from the preamble resource pool and sends it to the base station. The base station performs correlation detection on the received signal to identify the preamble sent by the user. In the second step, the base station sends a random access response (RAR) to the user, which may include a random access preamble identifier, a timing advance instruction determined based on the delay estimation between the user and the base station, a temporary cell radio network temporary identifier (Cell-Radio Network Temporary Identifier, C-RNTI), and the time-frequency resources allocated for the user's next uplink transmission. In the third step, the user sends a third message (Msg3) to the base station based on the information in the RAR. Msg3 may include information such as the user terminal identifier and the RRC connection request, wherein the user terminal identifier is unique to the user and is used to resolve conflicts. In the fourth step, the base station sends a conflict resolution identifier to the user, which may include the user terminal identifier that wins the conflict resolution. After detecting its own identity, the user upgrades the temporary C-RNTI to C-RNTI and sends a confirmation signal to the base station to complete the random access process and wait for the base station to schedule. Otherwise, the user will start a new random access process after a specific time period.

[0006] For the non-contention-based random access process, since the base station knows the user identity and can allocate a preamble to the user, the user does not need to randomly select a preamble when sending a preamble, but can use the allocated preamble. After detecting the allocated preamble, the base station will send a corresponding random access response, which may include information such as timing advance and uplink resource allocation. After receiving the random access response, the user considers that the uplink synchronization has been completed and waits for further scheduling by the base station. Therefore, the non-contention-based random access process can include only two steps: the first step is that the user sends a preamble; the second step is that the base station sends a random access response.

[0007] In some mobile communication systems (licensed spectrum and / or unlicensed spectrum), in order to achieve faster transmission and reception of signals, it is considered to send a random access preamble together with a random access data part (expressed as message A), and then search for feedback from a user equipment in a downlink channel (expressed as message B). However, how to determine the configuration of the random access preamble and random access data resources in message A is a problem that needs to be solved.

[0008] In addition, how to determine the mapping relationship between the random access resource and the random access data resource so that the base station can better detect the message A sent by the user is also a problem that needs to be solved. Summary of the invention

[0009] According to one aspect of the present invention, a method for resource configuration of an uplink signal is provided, comprising: obtaining the configuration of random access resources of two-step random access and data resources of two-step random access based on resource configuration information of the uplink signal; and determining the mapping relationship between the random access resources of two-step random access and the data resources of two-step random access based on a predetermined mapping mode between the random access resources of two-step random access and the data resources of two-step random access.

[0010] The resource configuration information may include at least one of the following items: four-step random access configuration information, two-step random access configuration information, downlink beam configuration information, two-step random access data resource configuration information, and configuration type information.

[0011] The configuration type information may indicate one of two configuration types, wherein the first configuration type indicates at least one of the position, size and quantity of the random access resources of the two-step random access and the data resources of the two-step random access, and the second configuration type indicates the position of the random access resources of the two-step random access and the positional relationship between the random access resources of the two-step random access and the data resources of the two-step random access.

[0012] The resource configuration information may be obtained based on at least one of the following items: random access feedback, downlink control information for scheduling uplink transmission, high-layer control signaling, and pre-configured parameter information.

[0013] The predetermined mapping pattern between the random access resources of the two-step random access and the data resources of the two-step random access may include: a mapping period of the random access resources of the two-step random access and the data resources of the two-step random access; and a mapping rule between the random access resources of the two-step random access and the data resources of the two-step random access.

[0014] The mapping period of the random access resources of two-step random access and the data resources of two-step random access may include at least one of the following items: a predefined period; a related period of the random access resources of two-step random access; a related period of the data resources of two-step random access; a larger period or a smaller period between the related period of the random access resources of two-step random access and the related period of the data resources of two-step random access.

[0015] The relevant period of the random access resources of two-step random access may include at least one of the following items: a mapping ring of a downlink beam to random access resources of two-step random access, a configuration period of random access resources of two-step or four-step random access, a mapping period of a downlink beam to random access resources of two-step or four-step random access, and a mapping pattern period of a downlink beam to random access resources of two-step or four-step random access.

[0016] The relevant period of the data resources for two-step random access may include at least one of the following items: a mapping ring from a downlink beam to data resources for two-step random access, a configuration period of data resources for two-step random access, a mapping period from a downlink beam to data resources for two-step random access, and a mapping pattern period from a downlink beam to data resources for two-step random access.

[0017] The correlation comparison between the larger period or the smaller period in the correlation period of the random access resource of the two-step random access and the correlation period of the data resource of the two-step random access can be based on at least one of the following: the time length occupied by a single correlation period, the number of time units included in a single correlation period, the number of configuration resources included in a single correlation period, and the number of equivalent configuration resources included in a single correlation period.

[0018] The mapping rule between the random access resources of the two-step random access and the data resources of the two-step random access may include at least one of the following items: determining the mapping between the random access resources of the two-step random access and the data resources of the two-step random access from a predetermined starting point; when the mapping period of the random access resources of the two-step random access and the data resources of the two-step random access is determined, obtaining the mapping parameter N of the random access resources of the two-step random access and the data resources of the two-step random access from the RRC configuration, system message, downlink control information, or pre-configured parameter information of the user equipment sent by the base station, wherein N represents that N random access resources of the two-step random access are mapped to one data resource of the two-step random access; when the mapping period of the random access resources of the two-step random access and the data resources of the two-step random access is determined, During a mapping period, the number of random access opportunities N_roperassocationperiod of two-step random access in a mapping period, the number of preamble codes N_preambleperro used for two-step random access on a random access opportunity and the number of time-frequency resource units N_puschperassociationperiod of the physical uplink shared channel of two-step random access in a mapping period are determined according to the resource configuration information, and a mapping parameter N=N_roperassocationperiod*N_preambleperro / N_puschperassociationperiod of the random access resources of the two-step random access and the data resources of the two-step random access is determined.

[0019] According to another aspect of the present invention, a user equipment is provided, including a memory and a processor, wherein the memory stores computer executable instructions, and when the instructions are executed by the processor, the aforementioned method is executed.

[0020] According to another aspect of the present invention, a computer-readable medium is provided, on which computer-executable instructions are stored. When the instructions are executed, the above method is executed.

[0021] According to the embodiments described above, in general, configuration information can be sent to the user equipment, and possible random access preamble code signals can be detected on the configured random access opportunities, and uplink signals sent by the user equipment can be detected on the configured uplink transmission resources, so that the mapping relationship between random access resources and random access data resources can be determined, so that the base station can better detect the messages sent by the user. More specifically, the configuration of the random access resources of the two-step random access and the data resources of the two-step random access can be obtained by resource configuration information based on the uplink signal, so that the configuration can be further performed based on the obtained configuration of the random access resources and the data resources of the two-step random access; the mapping relationship between the random access resources of the two-step random access and the data resources of the two-step random access can be determined by a predetermined mapping mode between the random access resources of the two-step random access and the data resources of the two-step random access, so that the mapping relationship between the random access resources and the data resources can be determined; in addition, by indicating the configuration type information of one of the two configuration types according to the embodiment of the present invention, the user can obtain the correct configuration type, and the configuration means are enriched compared with the prior art that only has one configuration type; by the mapping period of the random access resources of the two-step random access and the data resources of the two-step random access according to the embodiment of the present invention, the mapping period can be directly determined, so that compared with the method of speculating the mapping period in the prior art, the user can more conveniently determine the mapping pattern, and the mapping period of the specific type according to the embodiment of the present invention can make the mapping period more comprehensive; by the mapping rule between the random access resources of the two-step random access and the data resources of the two-step random access according to the embodiment of the present invention, it can also be guaranteed that there is a complete mapping within a mapping period. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and other objects and features of the present invention will become more apparent from the following detailed description in conjunction with the accompanying drawings, in which:

[0023] Figure 1 is a flow chart showing a method for configuring uplink transmission resources according to an exemplary embodiment of the present invention;

[0024] Figure 2 is a block diagram illustrating a user equipment according to an exemplary embodiment of the present invention;

[0025] Figure 3 is a schematic diagram of an example of configuring a contention-free two-step random access preamble;

[0026] Figure 4 This is a schematic diagram of Example 2 of configuring a contention-free two-step random access preamble. DETAILED DESCRIPTION

[0027] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present disclosure. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0028] It will be understood by those skilled in the art that, unless expressly stated, the singular forms "one", "said", and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other element, or there may be intermediate elements. In addition, the "connection" or "coupling" used herein may include wireless connection or wireless coupling. The term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0029] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as herein.

[0030] It will be understood by those skilled in the art that the "terminal" and "terminal device" used herein include both devices with wireless signal receivers, which are devices with only wireless signal receivers without transmission capabilities, and devices with receiving and transmitting hardware, which are devices with receiving and transmitting hardware capable of performing two-way communication on a two-way communication link. Such devices may include: cellular or other communication devices, which have a single-line display or a multi-line display or a cellular or other communication device without a multi-line display; a personal communication system (Personal Communications Service, PCS), which may combine voice, data processing, fax and / or data communication capabilities; a personal digital assistant (Personal Digital Assistant, PDA), which may include a radio frequency receiver, a pager, Internet / intranet access, a web browser, a notepad, a calendar and / or a global positioning system (Global Positioning System, GPS) receiver; a conventional laptop and / or palmtop computer or other device, which has and / or includes a conventional laptop and / or palmtop computer or other device with a radio frequency receiver. The "terminal" or "terminal device" used herein may be portable, transportable, installed in a vehicle (air, sea and / or land), or adapted and / or configured to operate locally, and / or in a distributed form, at any other location on the earth and / or in space. The "terminal" or "terminal device" used herein may also be a communication terminal, an Internet terminal, a music / video playing terminal, such as a PDA, a mobile Internet device (MID) and / or a mobile phone with a music / video playing function, or a smart TV, a set-top box and other devices.

[0031] The time domain unit (also called time unit) in the present invention can be: an OFDM symbol, an OFDM symbol group (consisting of multiple OFDM symbols), a time slot, a time slot group (consisting of multiple time slots), a subframe, a subframe group (consisting of multiple subframes), a system frame, a system frame group (consisting of multiple system frames); it can also be an absolute time unit, such as 1 millisecond, 1 second, etc.; the time unit can also be a combination of multiple granularities, such as N1 time slots plus N2 OFDM symbols.

[0032] The frequency domain unit in the present invention can be: a subcarrier, a subcarrier group (consisting of multiple subcarriers), a resource block (RB), which can also be called a physical resource block (PRB), a resource block group (consisting of multiple RBs), a bandwidth part (BWP), a band part group (consisting of multiple BWPs), a band / carrier, a band group / carrier group; it can also be an absolute frequency domain unit, such as 1 Hz, 1 kHz, etc.; the frequency domain unit can also be a combination of multiple granularities, such as M1 PRBs plus M2 subcarriers.

[0033] In order to make the objectives, technical means and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0034] Figure 1 is a flow chart showing a method for configuring uplink transmission resources according to an exemplary embodiment of the present invention.

[0035] like Figure 1 As shown, in step S110, the configuration of the random access resources of the two-step random access and the data resources of the two-step random access is obtained based on the resource configuration information of the uplink signal.

[0036] In step S120, a mapping relationship between the random access resources of the two-step random access and the data resources of the two-step random access is determined based on a predetermined mapping mode between the random access resources of the two-step random access and the data resources of the two-step random access.

[0037] After the mapping relationship is determined, the random access resources of the two-step random access and the data resources of the two-step random access may be used accordingly to send the preamble sequence and the data.

[0038] Figure 1 The method shown may be performed by a UE.

[0039] Here, as an example only, the resource configuration information may include at least one of the following: four-step random access configuration information, two-step random access configuration information, downlink beam configuration information, two-step random access data resource configuration information, and configuration type information. It should be understood that the above-listed items are only exemplary and the present disclosure is not limited thereto.

[0040] Specifically, the four-step random access configuration information (i.e., conventional random access configuration information) may include at least one of the following: a four-step random access configuration period (P_4STEPRACH); a four-step random access opportunity (4STEPRO) time unit index (e.g., time slot index, symbol index, subframe index, etc.); a four-step random access opportunity frequency domain unit index (e.g., carrier index, BWP index, PRB index, subcarrier index, etc.); the number of four-step random access opportunities; a four-step random access preamble format (e.g., cyclic prefix length, preamble length and number of repetitions, guard interval length, subcarrier spacing used, etc.); the number of four-step random access preambles, the index of the root sequence, and the cyclic shift value; the number of SSBs that can be mapped on a four-step random access opportunity; one or more channel state information-reference signal (CSI-RS) indexes for four-step random access; the number of 4STEPROs mapped to a CSI-RS; and one or more 4STEPRO indexes mapped to a CSI-RS. It should be understood that the above-listed items are merely exemplary and the present disclosure is not limited thereto.

[0041] The two-step random access configuration information may include at least one of the following: a two-step random access configuration period (P_2STEPRACH); a two-step random access opportunity (2STEPRO) time unit index (for example, a time slot index, a symbol index, a subframe index, etc.); a two-step random access opportunity frequency domain unit index (for example, a carrier index, a BWP index, a PRB index, a subcarrier index, etc.); the number of two-step random access opportunities; a two-step random access preamble format (for example, a cyclic prefix length, a preamble length and the number of repetitions, a guard interval length, the subcarrier spacing used, etc.); the number of two-step random access preambles, the index of the root sequence, the cyclic shift value; the number of SSBs that can be mapped on a two-step random access opportunity; one or more CSI-RS indexes for two-step random access; the number of 2STEPROs mapped to a CSI-RS; one or more 2STEPRO indexes mapped to a CSI-RS. If the parameters in the above two-step random access configuration information are not configured separately, the user equipment can determine the parameters in the two-step random access configuration information based on the relative relationship with the corresponding parameters in the four-step random access configuration information, for example, the four-step random access configuration period is calculated with the predefined parameters to obtain the two-step random access configuration period. It should be understood that the above listed items are only exemplary and the present disclosure is not limited thereto.

[0042] Downlink beam (e.g., SSB and / or CSI-RS) configuration information may include at least one of the following: downlink beam period; the number of downlink beams sent in a downlink beam period; the index of the downlink beam sent in a downlink beam period; the time unit position of the downlink beam sent in a downlink beam period; the frequency domain unit position of the downlink beam sent in a downlink beam period. It should be understood that the above-listed items are only exemplary and the present disclosure is not limited thereto.

[0043] Data resource configuration information for two-step random access, for example, data resource configuration information for a physical uplink shared channel (PUSCH), each PUSCH resource unit (consisting of a PUSCH time-frequency resource unit and a DMRS resource) may include at least one of the PUSCH time-frequency resource configuration information and the DMRS configuration information. It should be understood that the above-listed items are only exemplary and the present disclosure is not limited thereto.

[0044] Here, the time-frequency resource configuration information of the PUSCH may include at least one of the following: one or more PUSCH time-frequency resource unit sizes (i.e., the PUSCH time-frequency resource size corresponding to a two-step random access preamble code, including M time units and N frequency domain units; if there are multiple PUSCH time-frequency resource units, the sizes of different PUSCH time-frequency resource units may be different, that is, the values ​​of M and / or N will vary according to the different PUSCH time-frequency resource units), and the size of the PUSCH time-frequency resource unit can be determined by looking up a table; the time-frequency resource configuration period of the PUSCH (P_PUSCH); the time unit index of the PUSCH time-frequency resource unit (for example, a time slot index, a symbol index, a subframe index, etc.); the frequency domain unit index of the PUSCH time-frequency resource unit (for example, Such as carrier index, BWP index, PRB index, subcarrier index, etc.); the time domain starting position of the PUSCH time-frequency resources; the frequency domain starting position of the PUSCH time-frequency resources; the number of PUSCH time-frequency resource units (or the number of PUSCH time-frequency resource units in the time domain and / or the number of PUSCH time-frequency resource units in the frequency domain are configured separately); the format of the PUSCH time-frequency resource unit (for example, the number of repetitions, the length of the guard interval GT, the guard frequency domain interval GP, etc.); the number of downlink beams that can be mapped on a PUSCH time-frequency resource unit; one or more downlink beam indices for two-step random access PUSCH transmission; the number of PUSCH time-frequency resource units mapped to a downlink beam; one or more PUSCH time-frequency resource unit indices mapped to a downlink beam, etc. It should be understood that the above-listed items are only exemplary and the present disclosure is not limited thereto.

[0045] The time domain starting position of the PUSCH time-frequency resource may include at least one of the following: the time domain interval between the PUSCH time-frequency resource configured by the network device and the corresponding two-step random access time-frequency resource (i.e., N time units); the time length occupied by the PUSCH time-frequency resource configured by the network device (i.e., M1 time units or M1 two-step random access PUSCH resource units (the resource unit is defined as the time-frequency resource size for sending a data portion of a specific size is composed of predefined X time units and Y frequency domain units)); the user equipment selects the two-step random access The first time unit after N (or N+x_id*M1; or N+x_id*M1*X; or N+x_id*M1+delta; or N+x_id*M1*X+delta) time units after the last time unit in the time range where the time-frequency resource is located is the time domain starting point position of the two-step PUSCH time-frequency resource corresponding to the selected two-step random access time-frequency resource, where x_id can be the index t_id or RO index on the time domain of the selected RO, and delta can be a predefined or configured additional time unit interval. It should be understood that the above-listed items are only exemplary and the present disclosure is not limited thereto.

[0046] Here, the time range where the selected two-step random access time-frequency resource is located may include at least one of the following: the selected two-step random access time-frequency resource (i.e., the selected RO); the random access time slot where the selected two-step random access time-frequency resource is located or the last RO therein in the time domain; the random access configuration period where the selected two-step random access time-frequency resource is located or the last RO therein in the time domain; a complete mapping (mapping circle) of the downlink beam where the selected two-step random access time-frequency resource is located to the random access resource or the last RO therein in the time domain; the mapping period (association period) of the downlink beam where the selected two-step random access time-frequency resource is located to the random access resource or the last RO therein in the time domain; the mapping pattern period (association pattern period) of the downlink beam where the selected two-step random access time-frequency resource is located to the random access resource or the last RO therein in the time domain. It should be understood that the above-listed items are only exemplary and the present disclosure is not limited thereto.

[0047] The frequency domain starting position of the time-frequency resource of PUSCH may be a predefined or configured frequency domain starting position, for example, N frequency domain units away from a frequency domain position are the frequency domain starting position of two-step random access PUSCH and / or M2 frequency domain units (or resource units of two-step random access PUSCH). Here, the one frequency domain position may be: a frequency band part, a carrier, etc.; the selected frequency domain starting position of two-step random access RO. The user equipment can determine that the frequency domain starting point position of the two-step random access PUSCH corresponding to the selected RO can be determined by the first frequency domain unit after N (or N+x_id*M2, or N+x_id*M2*Y, or N+x_id*M2+delta, or N+x_id*M2*Y+delta) frequency domain units, where x_id is the frequency domain index or RO index of the selected RO, or the selected preamble code index (the preamble code index on the entire RO or the preamble code index corresponding to the two-step random access available, for example, the preamble code index on the entire RO is 0 to 63, and the preamble codes available for two-step random access are 54 to 63, and the x_id available here is 0 to 9), and the special N can be 0, and delta can be represented as a protection carrier to avoid inter-carrier interference as much as possible. In particular, the time domain starting position of the indicated PUSCH time-frequency resources is the position of the first PUSCH time-frequency resource unit, the frequency domain starting position of the indicated PUSCH time-frequency resources is the position of the first PUSCH time-frequency resource unit, and the other time-frequency resources corresponding to all two-step random access time-frequency resources within the time range of the two-step random access time-frequency resources selected by the user equipment are derived sequentially by giving priority to the frequency domain and then the time domain, or giving priority to the time domain and then the frequency domain.

[0048] The DMRS configuration information may include at least one of the following: the number of DMRS ports N_DMRS and / or index available on a PUSCH time-frequency resource unit (i.e., the port configuration information corresponding to each DMRS port) and / or DMRS sequence index (e.g., scrambling ID, etc.); DMRS port configuration information. Here, the DMRS port configuration information may include at least one of the following: sequence type, such as indicating whether it is a ZC sequence, a gold sequence, etc.; cyclic shift interval; sequence length (i.e., the subcarrier occupied by the DMRS sequence); time domain orthogonal cover code (TD-OCC), for example, a TD-OCC with a length of 2 may be [+1-1], [-1, +1]; frequency domain orthogonal cover code (FD-OCC), for example, a FD-OCC with a length of 2 may be [+1-1], [-1, +1]; comb configuration, which may include comb size and / or comb offset, for example, if the comb size is 4 and the offset is 0, it means the 0th RE of every 4 REs of the DMRS sequence, and if the offset is 1, it means the 1st RE of every 4 REs of the DMRS sequence. It should be understood that the above-listed items are only exemplary and the present disclosure is not limited thereto.

[0049] The configuration type information may indicate one of two configuration types, wherein the first configuration type may indicate at least one of the positions, sizes and quantities of the two resources, namely, the random access resources of the two-step random access and the data resources of the two-step random access, and the second configuration type may indicate the positions of the random access resources of the two-step random access and the positional relationship between the random access resources of the two-step random access and the data resources of the two-step random access. More specifically, under the first configuration type, the user equipment may obtain the configured data resources of the two-step random access through the resource configuration information (e.g., the size and position of the data resources) configured separately by the base station, and then, through the predefined mapping mode of the random access resources and the data resources, the user equipment may obtain the mapping relationship between the random access resources and the data resources; under the second configuration type, the base station may obtain the configured random access resources of the two-step random access, and may obtain the configured data resources of the two-step random access and the mapping relationship between the random access resources and the data resources through the relative time-frequency relationship (e.g., time domain and / or frequency domain interval) between the data resources of the two-step random access and the random access resources of the two-step random access, or through the predefined mapping mode between the random access resources and the data resources. It should be understood that the above-listed items are merely exemplary and the present disclosure is not limited thereto.

[0050] The resource configuration information may be obtained based on at least one of the following items: random access feedback (RAR) of the random access process, for example, uplink scheduling (UL grant) information in the RAR; downlink control information for scheduling uplink transmission, for example, uplink scheduling (UL grant) information in the downlink control information or a separate DCI configuration, wherein the scheduled uplink transmission may be a new transmission of data or a retransmission of data; high-layer control signaling, for example, a system message sent by a base station or RRC configuration information obtained by a user equipment; pre-configured parameter information. It should be understood that the above-listed items are only exemplary and the present disclosure is not limited thereto.

[0051] Here, the user equipment can obtain all or part of the resource configuration information through at least one of the above information, for example, the time-frequency resource configuration information of PUSCH can be obtained from the system message, and the DMRS configuration information can be obtained from the RRC configuration information of the user equipment. More specifically, the user equipment can obtain a transmission resource configuration for two-step random access through the system message, and the user equipment can obtain another transmission resource configuration for two-step random access when the user is in a connected state through the RRC configuration information of the user equipment, for example, the DMRS resources in the transmission resources for two-step random access configured by the system message only include DMRS ports and use a preset DMRS sequence (for example, a preset scrambling ID), and the RRC configuration information of the user equipment can configure the DMRS resources to include DMRS ports and DMRS sequences (for example, multiple different scrambling IDs). Similarly, the above information can be used to configure a power control parameter (alphaMsgApusch) exclusive to the connected state to adjust the PUSCH transmission power of msgA when the user equipment performs two-step random access in the connected state.

[0052] In particular, when the first condition is met, the configured DMRS resources received by the UE include only DMRS ports and use a preset DMRS sequence (for example, a preset scrambling ID, only one scrambling ID), which means that the PUSCH resource unit at this time is composed of a PUSCH time-frequency resource unit and a DMRS port; when the first condition is not met, the DMRS resources configured by the DMRS resources received by the UE may include a DMRS port and a DMRS sequence (for example, there may be W different scrambling IDs, W is greater than 1, for example, W=2), which means that the PUSCH resource unit at this time is composed of a PUSCH time-frequency resource unit and a DMRS resource (including a DMRS port and a DMRS sequence); wherein the first condition may be a combination of one or more of the following:

[0053] 1. The number of random access preambles used for two-step random access within a time period or the number of random access preambles required to be mapped with the PUSCH resource unit of the two-step random access is less than or (not greater than) a preset value (or a value configured by the base station) X, for example, X=12 (considering that the maximum number of DMRS ports currently supported is 12), or X=8 (considering that it is easier to map with the preamble in integer multiples from a mathematical point of view); wherein the time period may be one of the following: one or more ROs, one or more RACH time slots, one or more RACH frames, one or more POs (PUSChoccasion, a time-frequency resource used to transmit the data part of the two-step random access, which has the same meaning as the PUSCH time-frequency resource unit in the present invention), one or more PUSCH time slots (PUSCH slot, including one or more POs), one or more PUSCH frames (PUSCH frame, including one or more PUSCH time slots), a mapping period of random access resources for two-step random access and data resources for two-step random access, a related period of random access resources for two-step random access, and a related period of data resources for two-step random access; wherein the number of random access preambles required for mapping with the PUSCH resource unit for two-step random access can be obtained by the number M1 of PUSCH resource units for two-step random access and a mapping parameter N between the random access preamble and the PUSCH resource unit. For example, if N=4, it means that 4 two-step random access preambles are mapped to 1 two-step random access PUSCH resource unit. If N=1 / 4, it means that 1 two-step random access preamble is mapped to 4 two-step random access PUSCH resource units. If M1=12 and N=4, the number of random access preambles required for mapping with the PUSCH resource unit for two-step random access is M / N=3.

[0054] 2. The number of DMRS resources used for two-step random access within a time period or the number of DMRS resources in the PUSCH resource unit required to be mapped with the random access preamble of the two-step random access is less than or (not greater than) a preset value (or a value configured by the base station) X, for example, X=12 (considering that the maximum number of DMRS ports currently supported is 12), or X=8 (considering that it is easier to map with the preamble in integer multiples from a mathematical point of view); wherein the time period may be one of the following: one or more ROs, one or more RACH time slots, one or more RACH frames, one or more POs (PUSCH occasions, time-frequency resources for transmitting the data part of the two-step random access), one or more PUSCH time slots (PUSCH slots, including one or more POs), one or more PUSCH frames (PUSCH frame, including one or more PUSCH time slots), a mapping period of random access resources for two-step random access and data resources for two-step random access, a related period of random access resources for two-step random access, and a related period of data resources for two-step random access; wherein the number of DMRS resources in the PUSCH resource unit that needs to be mapped with the random access preamble code of the two-step random access can be obtained by the random access preamble code M2 ​​of the two-step random access and the mapping parameter N of the random access preamble code and the PUSCH resource unit. For example, if N=4, it means that 4 two-step random access preamble codes are mapped to 1 two-step random access PUSCH resource unit. If N=1 / 4, it means that 1 two-step random access preamble code is mapped to 4 two-step random access PUSCH resource units. If M2=12, N=4, and there are M3=1 POs in the time period at this time, the number of DMRS resources in the PUSCH resource unit that needs to be mapped with the random access preamble code of the two-step random access is M2*N / M3=48.

[0055] 3. The initial power value (P0) configured by the base station is less than or not greater than a preset value (or the value configured by the base station)

[0056] In this way, when the required DMRS number does not exceed a certain value, the UE can give priority to using (the base station needs to be configured preferentially) the DMRS port to ensure the performance of two-step random access.

[0057] In addition, the user equipment can obtain the mapping information of the downlink beam to the RO (including four-step random access RO and / or two-step random access RO) based on the resource configuration information, and the mapping information may include at least one of the following items (here, it is assumed that the downlink beam is SSB): the mapping period of SSB to RO (for example, the number of random access configuration periods required to complete at least one SSB to RO mapping); the mapping pattern period of SSB to RO (for example, the time length to ensure that the mapping of SSB to RO in two adjacent mapping pattern periods is exactly the same, for example, the required number of SSB to RO mapping periods or the required number of random access configuration periods). Similarly, the user equipment may obtain CSI-RS to RO mapping information based on the resource configuration information, and the mapping information may include at least one of the following: CSI-RS to RO mapping period (for example, the number of random access configuration periods required to complete all CSI-RS to RO mappings within at least one CSI-RS period); CSI-RS to RO mapping pattern period (for example, the time length to ensure that the CSI-RS to RO mappings within two adjacent mapping pattern periods are exactly the same, for example, the number of CSI-RS to RO mapping periods required or the number of random access configuration periods required). It should be understood that the above-listed items are only exemplary and the present disclosure is not limited thereto.

[0058] The predetermined mapping mode between the random access resources of the two-step random access and the data resources of the two-step random access may include: a mapping period of the random access resources of the two-step random access and the data resources of the two-step random access; and a mapping rule between the random access resources of the two-step random access and the data resources of the two-step random access. It should be understood that the above-listed items are only exemplary and the present disclosure is not limited thereto.

[0059] Here, the mapping period of the random access resource of the two-step random access and the data resource of the two-step random access may include at least one of the following: a predefined period, for example, 10 milliseconds, 20 milliseconds, 40 milliseconds, 80 milliseconds, 160 milliseconds, etc.; a related period of the random access resource of the two-step random access; a related period of the data resource of the two-step random access; and a larger period or a smaller period in the related period of the random access resource of the two-step random access and the related period of the data resource of the two-step random access. It should be understood that the above-listed items are only exemplary and the present disclosure is not limited thereto.

[0060] The relevant period of the random access resource of the two-step random access may include at least one of the following: a mapping ring of a downlink beam to a random access resource of the two-step random access, for example, a mapping ring of SSB to RO; a configuration period of a random access resource of two-step or four-step random access; a mapping period of a downlink beam to a random access resource of two-step or four-step random access; a mapping pattern period of a downlink beam to a random access resource of two-step or four-step random access. It should be understood that the above-listed items are only exemplary and the present disclosure is not limited thereto.

[0061] The relevant period of the data resource of two-step random access may include at least one of the following: a mapping ring of downlink beam to data resource of two-step random access, for example, a mapping ring of SSB to PUSCH; a configuration period of data resource of two-step random access; a mapping period of downlink beam to data resource of two-step random access; a mapping pattern period of downlink beam to data resource of two-step random access. It should be understood that the above-listed items are only exemplary and the present disclosure is not limited thereto.

[0062] The correlation comparison of the larger or smaller period in the correlation period of the random access resource of the two-step random access and the correlation period of the data resource of the two-step random access may be based on at least one of the following: the time length occupied by a single correlation period (which may include the influence of different subcarrier sizes); the number of time units included in a single correlation period, for example, including N time slots, M OFDM symbols, etc.; the number of configuration resources included in a single correlation period; the number of equivalent configuration resources included in a single correlation period. It should be understood that the above-listed items are only exemplary and the present disclosure is not limited thereto.

[0063] Here, for the number of configured resources included in a single related period, 1) for a random access resource related period of two-step random access, the number of configured resources included is the number of random access opportunities N_ro of two-step random access included in a random access resource related period of two-step random access, and / or the number of preambles N_preambleperro used for two-step random access on a random access opportunity, and / or the number of random access opportunities multiplied by the number of preambles used for two-step random access on a random access opportunity, that is, N_ro*N_preambleperro; the number of configured resources may be the number of valid resources, for example, 20 random access opportunities are configured in one period, and resources determined to be invalid by a predefined validity judgment criterion may not be included in the number, for example, if 6 ROs conflict with downlink and become invalid ROs, and the remaining 14 ROs are valid, then the number of (valid) configured resources that can be obtained is 14; 2) for a data resource related period of two-step random access, the number of configured resources included is N_ro of two-step random access opportunities, and / or the number of preambles N_preambleperro of two-step random access opportunities multiplied by the number of preambles used for two-step random access on a random access opportunity, that is, N_ro*N_preambleperro; the number of configured resources may be the number of valid resources, for example, 20 random access opportunities are configured in one period, and resources determined to be invalid by a predefined validity judgment criterion may not be included in the number, for example, if 6 ROs conflict with downlink and become invalid ROs, and the remaining 14 ROs are valid, then the number of (valid) configured resources that can be obtained is 14; The number of configured resources included is the number N_pusch of PUSCH time-frequency resource units for two-step random access included in a data resource-related period for two-step random access, and / or the number N_dmrsperpusch of DMRS resources used for two-step random access on a PUSCH time-frequency resource, and / or the number of PUSCH time-frequency resource units multiplied by the number of DMRS resources used for two-step random access on a PUSCH time-frequency resource, that is, N_pusch*N_dmrsperpusch, which is the number of PUSCH resource units; the number of configured resources may be the number of valid resources, for example, 20 PUSCH time-frequency resource units are configured in one period, and resources determined to be invalid by a predefined validity judgment criterion are not included in the number, for example, if 6 PUSCH time-frequency resource units conflict with the downlink and become invalid PUSCH time-frequency resource units, and the remaining 14 PUSCH time-frequency resource units are valid, then the number of (valid) configured resources that can be obtained is 14. It should be understood that the above-listed items are merely exemplary and the present disclosure is not limited thereto.

[0064] Here, for the number of equivalent configuration resources contained in a single correlation period, that is, whether the configuration resources in a random access resource correlation period of a two-step random access can be completely mapped to the configuration resources in a data resource correlation period of a two-step random access is determined, and if so, the data resource correlation period of the two-step random access can be determined as a mapping period; or, whether the configuration resources in a data resource correlation period of a two-step random access can be completely mapped to the configuration resources in a random access resource correlation period of a two-step random access is determined, and if so, the random access resource correlation period of the two-step random access can be determined as a mapping period. For example, the user equipment can obtain a mapping parameter N between the random access resources of the two-step random access and the data resources of the two-step random access (which can be obtained from the RRC configuration, system message, downlink control information, or pre-configured parameter information of the user equipment sent by the base station), for example, if N=4, it means that 4 two-step random access preambles are mapped to 1 two-step random access PUSCH resource unit, and if N=1 / 4, it means that 1 two-step random access preamble is mapped to 4 two-step random access PUSCH resource units. The equivalent number of configured resources may be the equivalent number of configured resources of data resources of two-step random access obtained by using the mapping parameter N for the number of configured resources included in a random access resource-related period of two-step random access, or the equivalent number of configured resources of random access resources of two-step random access obtained by using the mapping parameter N for the number of configured resources included in a data resource-related period of two-step random access. For example, if the number of configuration resources included in a random access resource-related period of a two-step random access is 20 ROs, and the mapping parameter is N=4, then the equivalent number of configuration resources is 20 / 4=5 PUSCH resource units; if the number of configuration resources included in a data resource-related period of a two-step random access is 20 PUSCH resource units, which is greater than the equivalent number of configuration resources included in a random access resource-related period of a two-step random access, it indicates that the number of configuration resources included in a data resource-related period of a two-step random access can completely map the random access resources included in a random access resource-related period of a two-step random access, so a data resource-related period of a two-step random access can be determined as a mapping period; similarly, the equivalent number of configuration resources can be obtained by the number of configuration resources and mapping parameters of a data resource-related period of a two-step random access, and then compared with the configuration resources included in a random access resource-related period of a two-step random access to obtain a mapping period, wherein the configuration resources can be valid configuration resources. It should be understood that the above-listed items are only exemplary, and the present disclosure is not limited thereto.

[0065] The mapping rule between the random access resource of the two-step random access and the data resource of the two-step random access may include at least one of the following:

[0066] 1) determining a mapping between a random access resource of a two-step random access and a data resource of the two-step random access starting from a predetermined starting point, for example, starting from a system frame number (SFN) 0 (or resetting), and then mapping a maximum SFN;

[0067] 2) when the mapping period of the random access resources of the two-step random access and the data resources of the two-step random access is determined, the mapping parameter N of the random access resources of the two-step random access and the data resources of the two-step random access is obtained from the RRC configuration, system message, downlink control information, or pre-configured parameter information of the user equipment sent by the base station, wherein N represents that N random access resources of the two-step random access are mapped to one data resource of the two-step random access; more specifically, when the user equipment determines the mapping period of the random access resources of the two-step random access and the data resources of the two-step random access, and obtains the mapping parameter N of the random access resources of the two-step random access and the data resources of the two-step random access (which can be from the RRC configuration, system message, downlink control information, or pre-configured parameter information of the user equipment sent by the base station), the user equipment can further determine the number of random access opportunities N_roperassocationperiod of the two-step random access in the mapping period, and / or the number of preambles N_preambleperro for the two-step random access on a random access opportunity, and / or the number of random access opportunities N_roperassocationperiod for the two-step random access in the mapping period according to the resource configuration information. The number of preambles used for two-step random access on a random access opportunity is multiplied by the number of preambles used for two-step random access on a random access opportunity, that is, the number of all preambles included in the mapping period N_preambleperassociationperiod=N_roperassociationperiod*N_preambleperro; the user equipment may determine the number of PUSCH time-frequency resource units for two-step random access in the mapping period N_puschperassociationperiod according to the resource configuration information, and / or the number of DMRS resources used for two-step random access on a PUSCH time-frequency resource N_dmrsperpusch, and / or the number of PUSCH time-frequency resource units multiplied by the number of DMRS resources used for two-step random access on a PUSCH time-frequency resource N_pruperassociationperiod=N_puschperassociationperiod*N_dmrsperpusch, that is, the number of PUSCH resource units; at this time, the mapping mode may be at least one of the following:

[0068] i) Through the obtained N_preambleperassociationperiod and the mapping parameter N, the user equipment obtains the number of PUSCH resource units N_pusch_needed = N_preambleperassociationperiod / N required to completely map the random access resources of N_preambleperassociationperiod two-step random access (if N_preambleperassociationperiod / N is a non-integer, N_preambleperassociationperiod / N can be rounded up or down to obtain N_pusch_needed), wherein, if N_pusch_needed is less than or equal to the obtained N_preambleperassociationperiod, N_preambleperassociationperiod is mapped to N_pusch according to the configuration. ch_needed, the remaining (N_pruperassociationperiod-N_pusch_needed) are not used; in addition, if N_pruperassociationperiod = W*N_pusch_needed+delta, that is, the number of PUSCH resource units in one mapping period can complete the complete mapping of W (W is a positive integer greater than 0) random access resources to data resources, then only the remaining delta (that is, the complete mapping of one random access resource to the data resource cannot be completed) PUSCH resource units are considered as useless PUSCH resource units, and the user equipment does not map them, nor use them to send two-step random access uplink data; if N_pusch_needed is less than or equal to the obtained N_pruperassociationperiod, the user equipment can determine at least one of the following: a) this is an error condition, and the user equipment behavior is undefined; b) the user equipment does not expect this condition to occur;

[0069] c) Through the obtained N_pruperassociationperiod and the mapping parameter N, the user equipment obtains the number of random access resources N_preamble_needed=N_pruperassociationperio*N required to completely map the N_pruperassociationperio two-step random access data resources (if N_pruperassociationperio*N is a non-integer, N_pruperassociationperio*N can be rounded up or down to obtain N_preamble_needed); N_pruperassociationperiod is set according to the configuration Mapped to N_preamble_needed, the remaining (N_preambleperassociationperiod-N_preamble_needed) is not used; in addition, if N_preambleperassociationperiod=X*N_preamble_needed+delta, that is, the number of random access resources in one mapping period can complete the complete mapping of X (X is a positive integer greater than 0) data resources to random access resources, then only the remaining delta (that is, the complete mapping of one data resource to the random access resource cannot be completed) random access resources are considered to be useless random access resources, and the user equipment does not map them or select them.

[0070] ii) Through the obtained N_pruperassociationperiod and the mapping parameter N, the user equipment obtains the number of random access resources required to completely map the N_pruperassociationperio two-step random access data resources as N_preamble_needed=N_pruperassociationperio*N (if N_pruperassociationperio*N is a non-integer, N_pruperassociationperio*N can be rounded up or down to obtain N_preamble_needed), where, If N_preamble_needed is less than or equal to the obtained N_premableperassociationperiod, N_pruperassociationperiod is mapped to N_preamble_needed according to the configuration, and the remaining (N_preambleperassociationperiod-N_preamble_needed) is not used; in addition, if N_preambleperassociationperiod = X*N_preamble_needed+delta, that is, the random access resources in one mapping period The number of sources can complete the complete mapping of X (X is a positive integer greater than 0) data resources to random access resources, then only the remaining delta (that is, the complete mapping of one data resource to a random access resource cannot be completed) random access resources are considered as useless random access resources, and the user equipment does not map them or select them; if N_preamble_needed is less than or equal to the obtained N_preambleperassociationperiod, the user equipment can determine at least one of the following: a) this is an error condition, and the user equipment behavior is undefined; b) the user equipment does not expect this condition to occur; c) through the obtained N_preambleperas sociationperiod and mapping parameter N, the user equipment obtains the number of PUSCH resource units required to completely map the random access resources of N_preambleperassociationperiod two-step random accesses as N_pusch_needed=N_preambleperassociationperiod / N (if N_preambleperassociationperiod / N is a non-integer, N_preambleperassociationperiod / N can be rounded up or down to obtain N_pusch_needed);Map N_preambleperassociationperiod to N_pusch_needed according to the configuration, and the remaining (N_pruperassociationperiod-N_pusch_needed) is not used; in addition, if N_pruperassociationperiod = W*N_pusch_needed+delta, that is, the number of PUSCH resource units in a mapping period can complete the complete mapping of W (W is a positive integer greater than 0) random access resources to data resources, then only the remaining delta (that is, the complete mapping of a random access resource to a data resource cannot be completed) PUSCH resource units are considered as useless PUSCH resource units, and the user equipment does not map them, nor use them to send two-step random access uplink data. ;

[0071] 3) when the mapping period of the random access resources of the two-step random access and the data resources of the two-step random access is determined, the number of random access opportunities N_roperassocationperiod of the two-step random access in a mapping period, the number of preamble codes N_preambleperro for the two-step random access on a random access opportunity and the number of time-frequency resource units N_puschperassociationperiod of the physical uplink shared channel of the two-step random access in a mapping period are determined according to the resource configuration information, and the mapping parameter N=N_roperassocationperiod*N_preambleperro / N_puschperassociationperiod of the random access resources of the two-step random access and the data resources of the two-step random access is determined; more specifically, when the user equipment determines the mapping period of the random access resources of the two-step random access and the data resources of the two-step random access, the user equipment determines the number of random access opportunities N_roperassocationperiod of the two-step random access in the mapping period, and / or the number of preamble codes N_preambleperro for the two-step random access on a random access opportunity according to the resource configuration information. The user equipment then determines the number of PUSCH time-frequency resource units for two-step random access in the mapping period N_puschperassociationperiod according to the resource configuration information, and / or the number of DMRS resources for two-step random access on a PUSCH time-frequency resource, and / or the number of PUSCH time-frequency resource units multiplied by the number of DMRS resources for two-step random access on a PUSCH time-frequency resource, that is, N_pruperassociationperiod=N_puschperassociationperiod*N_dmrsperpusch, which is the number of PUSCH resource units;At this time, the user equipment determines the mapping parameter N of the random access resource and the data resource through the obtained N_preambleperassociationperiod and N_puschperassociationperiod, that is, N=N_preambleperassociationperiod / N_puschperassociationperiod, more specifically, N=[N_preambleperassociationperiod / N_puschperassociationperiod], wherein [x] represents a value operation performed on x, and the value operation may be an integer operation (for example, rounding up or rounding down), or may be a distance preset or found according to N_puschperassociationperiod / N_preambleperassociationperiod. The nearest value in the configured parameter set (or the minimum parameter value greater than (not less than) the calculated value), for example, if N_puschperassociationperiod=10, N_preambleperassociationperiod=56, the preset parameter set is {16, 8, 4, 2, 1, 1 / 2, 1 / 4, 1 / 8, 1 / 16}, then the nearest value greater than N_puschperassociationperiod / N_preambleperassociationperiod=5.6, that is, N=4, if the minimum parameter value greater than (not less than) the calculated value 5.6 is used, then N=8; here, N=4 means that 4 two-step random access preamble codes are mapped to 1 two-step random access PUSCH resource unit, and N=1 / 4 means that 1 two-step random access preamble code is mapped to 4 two-step random access PUSCH resource units. In addition, after the mapping is completed according to the obtained mapping parameters, if there are remaining random access resources or data resources for two-step random access, the remaining resources will not be mapped. For example, in the above example, N=8, 56 / 8=7 PUSCH resource units are required to complete the mapping of 56 preambles in one mapping cycle, and there are 10 PUSCH resource units in one mapping cycle, and the remaining 3 PUSCH resource units are not mapped. ;

[0072] According to the configuration information and mapping relationship settings received above, the user equipment can randomly access the RO and preamble code through the determined (selected) two-step random access, and then find the available PUSCH resources (PUSCH time-frequency resources and DMRS resources) through the mapping relationship. If N>1 PUSCH resources are found, the user equipment can select a PUSCH resource with medium probability for corresponding PUSCH transmission.

[0073] After the user equipment sends message A, it can search for possible downlink feedback on the configured or preset downlink control channel resources, and can perform subsequent operations according to the type of downlink feedback received and the content in the downlink feedback. Preferably, when searching for possible downlink feedback, the UE may use a second message radio network temporary identifier, such as msgB-RNTI; for example, when the UE searches for the RNTI used for CRC scrambling of a PDCCH and the msgB-RNTI, the UE may believe that the correct PDCCH has been found, thereby further decoding or interpreting the content of the PDCCH. The possible generation method of the msgB-RNTI may be related to the random access opportunity in the preamble code used by the UE to send message A, and is calculated as follows:

[0074] msgB-RNTI=1+s'_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id

[0075] Wherein, s'_id is the index of the first OFDM symbol of the random access opportunity in a time slot (expressed as s_id) plus 1, (0≤s_id<14), or s'_id is the index of the second OFDM symbol of the random access opportunity in a time slot, for example (1≤s'_id<14); or s'_id is the index of the last OFDM symbol of the random access opportunity in a time slot, for example (1≤s'_id<14); t_id is the index value of the (first) time slot where the random access opportunity is located in the system frame, for example (0≤t_id<80), f_id is the random access opportunity index of the random access opportunity in the frequency domain, for example (0≤f_id<8), ul_carrier_id is the frequency band distinction used to send the random access signal; for example (0 if the preamble is sent on the normal uplink frequency band (normal UL, NUL), then ul_carrier_id=0; if the preamble is sent on the positive supplementary uplink frequency band (supplementary UL, SUL), then ul_carrier_id = 1).

[0076] In another embodiment of the present invention, the present invention provides a method for sending a two-step random access for contention-free (non-contention or contention free) by a user equipment and a method for receiving a feedback message from a base station equipment. The user can obtain configuration information for contention-free two-step random access by one of the following methods (or a combination of multiple methods):

[0077] 1. Carry configuration information in DCI; for example, when the base station device uses PDCCH order to instruct the UE to perform contention-free two-step random access,

[0078] 2. Carrying configuration information through high-level configuration signaling; for example, when the base station device uses a handover command to instruct the UE to perform contention-free two-step random access and then perform handover;

[0079] 3. Carrying configuration information through beam failure recovery configuration signaling; for example, when the base station equipment configures the configuration information that can be used for contention-free two-step random access through the UE-specific beam failure recovery configuration signaling, when the UE meets the beam failure recovery rules and performs contention-free two-step random access according to the instructions of the base station;

[0080] 4. Carry configuration information through system information configuration;

[0081] Specifically, the configuration information for contention-free two-step random access may include at least one of the following:

[0082] 1. Dedicated preamble sequence index,

[0083] 2. Dedicated two-step random access opportunity (RACH occasion, RO), (can be notified by direct RO index or PRACH mask index)

[0084] 3. A downlink beam index (for example, an SSB index or a CSI-RS index), wherein the dedicated preamble sequence index and / or the dedicated two-step random access opportunity has a mapping relationship with the downlink beam index; specifically, the user equipment determines to send a contention-free two-step random access message A (including a preamble of the two-step random access and / or a data part of the two-step random access) by at least one of the following methods:

[0085] 1. Configure a preamble set for contention-free two-step random access, and the exclusive preamble sequence index received by the UE comes from the preamble set. Combined with the configured contention-free two-step random access configuration information; that is, when the user equipment has obtained the configuration information for contention-free two-step random access (such as the mapping relationship between the downlink beam index and the random access resources (including preambles and / or random access opportunities) of the contention-free two-step random access, the mapping relationship between the random access resources of the two-step random access and the data resources of the two-step random access, such as the time domain interval, etc.), the user equipment can find the available random access opportunities (sets) and / or random access preambles (sets) through the selected downlink beam index, and can find the corresponding PUSCH resources (including PUSCH time-frequency resources and DMRS resources, wherein the DMRS resources include DMRSport configuration and / or DMRS sequence configuration) for sending the data part according to the mapping relationship through the determined random access opportunities and random access preambles. Among them, the user equipment obtains the number of available random access preambles for a given SSB index through the contention-free two-step random access configuration information, which is W, and from the preamble index x to the preamble index y, that is, y=x+W-1; then the configuration of the preamble set for contention-free two-step random access can be determined by at least one of the following methods:

[0086] a. A subset of preambles specifically used for contention-free two-step random access is separated (reserved) from the configured preamble set for contention-free two-step random access, and the configuration information for contention-free two-step random access may also include a starting preamble index x', and / or an ending preamble index y', and / or the number of preambles Z used for contention-free two-step random access (in a single RO mapped by a given SSB index); specifically, the preamble index may be an actual preamble index (for example, obtained by sequentially numbering all 64 preambles in an RO), or a logical preamble index (for example, sequentially numbering the number of preambles used for contention-free two-step random access in an RO, i.e., W preambles, and the corresponding preambles under different SSBs will be re-numbered in sequence); in particular,

[0087] i. The starting preamble index x' is preset to the starting preamble index x of the competition, then the ending preamble index y'=x+Z-1; and / or

[0088] ii. The end preamble index y' is preset as the end preamble index y of the competition, then the start preamble index x' = y-Z + 1; if Figure 3As shown, if there are 2 SSBs mapped to 64 preambles of an RO, taking SSB0 as an example, the preambles for the competitive four-step random access are W=12. If the preambles for the configured competitive two-step random access are also 12, and x=12, y=23, then Z=4 preambles are configured for the contention-free random access, and 20 to 23 are obtained as preambles for the contention-free random access.

[0089] In this method, the exclusive preamble sequence index obtained by the user needs to come from the given contention-free two-step random access preamble. In particular, the base station can rewrite the SSB mapped to the preamble by configuring the SSB index. For example, it is originally mapped to SSB 0, but the base station can configure SSB 1 separately, then the UE considers that this preamble is mapped to SSB1. At the same time, when the user equipment performs contention-based two-step random access, it must select a preamble from the actual contention-based two-step random access preamble set, that is, remove the reserved two-step random access preamble set for contention-free from the configured contention-based two-step random access preamble set to obtain the actual contention-based two-step random access preamble set. The advantage of this method is that the UE can reuse the mapping relationship between the preamble and the PUSCH resource defined in the contention-based two-step random access, then the UE can find the corresponding PUSCH resource through the configured exclusive preamble sequence index. If the configured exclusive preamble sequence index does not correspond to a valid PUSCH resource, the UE considers that this is an incorrect configuration, or the UE does not expect to receive such a configuration.

[0090] b. A set of preambles specifically used for contention-free two-step random access is separated (reserved) from the configured preamble set for contention-free two-step random access, and the configuration information for contention-free two-step random access may also include a starting preamble index x', and / or an ending preamble index y', and / or the number of preambles Z used for contention-free two-step random access (in a single RO mapped by a given SSB index); specifically, the preamble index may be an actual preamble index (for example, obtained by sequentially numbering all 64 preambles in an RO), or a logical preamble index (for example, sequentially numbering the number of preambles used for contention-free two-step random access in an RO, that is, W, and the corresponding preambles under different SSBs will be re-numbered in sequence); in particular,

[0091] i. The start preamble index x' is preset as the end preamble index y of the contention, then the end preamble index y'=y+Z-1; in particular, the end preamble index of the contention may be the end preamble index of the contention of the four-step random access or the end preamble index of the contention of the two-step random access; and / or

[0092] ii. The end preamble index y' is preset to the start preamble index x of the contention, then the start preamble index x'=x-Z+1, which is equivalent to configuring the contention-free random access preamble set between the end preamble index of the four-step random access contention and the start preamble index of the two-step random access contention; and / or

[0093] iii. The starting preamble index x' is preset as the ending preamble index y2 of the four-step random access contention, and the ending preamble index y' is preset as the starting preamble index x of the two-step random access contention. This is equivalent to x'=y2, y'=x, and the implicit notification Z=x-y2+1; Figure 4 As shown, x'=y2=11, y'=x=16, then the UE can infer that the preamble code set used for contention-free two-step random access is preamble codes 12-15.

[0094] In this method, the exclusive preamble sequence index obtained by the user needs to come from the given contention-free two-step random access preamble. Specifically, the base station can configure the SSB index mapped to the preamble by configuring the SSB index. If not configured, the SSB index mapped to the contention preamble set is reused. The advantage of this method is that the UE can reuse the mapping relationship between the preamble and the PUSCH resource defined in the contention two-step random access. Then, through the configured exclusive preamble sequence index, the UE can find the corresponding PUSCH resource. If the configured exclusive preamble sequence index does not correspond to a valid PUSCH resource, the UE considers this to be an incorrect configuration, or the UE does not expect to receive such a configuration.

[0095] 2. The exclusive preamble sequence index received by the UE comes from the reserved preamble set, that is, the base station configures the exclusive exclusive preamble sequence index from the four-step random access preamble excluding contention and / or the two-step random access preamble excluding contention, and there is no need to separately configure the two-step random access preamble set for contention-free. At this time, the configuration of PUSCH resources can be completed by at least one of the following methods:

[0096] a. The configuration information for contention-free two-step random access also includes dedicated PUSCH resource configuration information, specifically,

[0097] i. The relative time domain position interval with the random access time slot (RACH slot) where the configured dedicated two-step random access opportunity or the two-step random access opportunity selected by the UE is located, for example, M time unit intervals, for example, M time slots; the frequency domain starting position is notified by the interval of N frequency domain units with the first PRB of the BWP in the frequency domain; and the specific PUSCH resource unit size can be the same as the PUSCH resource unit size configured for the competitive two-step random access, or reconfigured in the manner of the PUSCH resource unit size configured for the competitive two-step random access (for example, reconfiguring the SLIV value, start and length indicator value); and / or

[0098] ii. Configure a dedicated uplink grant (including the starting position and size of time domain resources, the starting position and size of frequency domain resources, the PUSCH mapping type, etc.), or configure a PUSCH uplink grant for contention-free two-step random access in a "configured grant" manner; and / or

[0099] iii. Configure the period information of the dedicated PUSCH resource, such as 10ms, 20ms, etc., which appear repeatedly, or use the proportional coefficient of the random access configuration period (P_prachperiod), such as X*P_prachperiod, for example, X=0.5, P_prachperiod=10ms, indicating that the period of the dedicated PUSCH resource is 5ms. At this time, a dedicated preamble will correspond to two PUSCH resources. The UE can send on both PUSCH resources, or randomly select one to send, or send on the first available resource; for example, X= 2, P_prachperiod = 10ms, indicating that the period of the dedicated PUSCH resource is 20ms. At this time, there are two random access opportunities to send the dedicated preamble code, which will correspond to one PUSCH resource. The UE can send on both random access opportunities, or randomly select an opportunity to send, or send on the first available opportunity; In particular, when the period information of the dedicated PUSCH resource is not configured, the UE follows the random access configuration period that is equivalent to the period of the dedicated PUSCH resource; In particular, the period of the dedicated PUSCH resource is directly fixed to be equivalent to the random access configuration period;

[0100] b. If the dedicated PUSCH resource configuration information is not configured, the UE obtains the PUSCH resource for sending the contention-free two-step random access according to the mapping relationship between the random access resource and the PUSCH resource unit determined by the contention-free two-step random access (time domain interval, and / or frequency domain starting position, and / or PUSCH configuration period, and / or DMRS resource, etc.);

[0101] c. The DMRS resource configuration for sending PUSCH can be determined by at least one of the following methods:

[0102] i. Explicitly indicate the DMRS resource configuration, including one or more of the following: antenna port, DMRS port index, DMRS type, maximum length of DMRS (i.e., the number of OFDM symbols used to send DMRS), number of DMRS CDM group(s) without data, number of front-load symbols, DMRS sequence scrambling ID

[0103] ii. Predefined DMRS resource configuration, DMRS port index, and / or DMRS sequence scrambling ID, for example, using DMRS port 0, DMRS sequence scrambling ID is cell index cell ID;

[0104] Indicates the index of the DMRS resources (composed of DMRS port and DMRS sequence scrambling ID) available on a PUSCH opportunity (PUSCH occasion, a time-frequency resource unit used to send msgA PUSCH), which can be numbered sequentially in the manner of DMRS port first and DMRS sequence scrambling ID second, or in the manner of DMRS sequence scrambling ID first and DMRS port second; for example, a PUSCH opportunity consists of 24 DMRS resources, which consist of 12 DMRS ports and 2 DMRS sequence scrambling IDs, and are numbered sequentially in the manner of DMRS port first and DMRS sequence scrambling ID second, then there are 0 to 23 DMRS resources, and the UE can determine the DMRS resources (DMRS port and / or DMRS sequence scrambling ID) to be used through the DMRS resource index of or;

[0105] Figure 2 is a block diagram illustrating a user equipment according to an exemplary embodiment of the present invention.

[0106] like Figure 2 As shown, a user equipment 200 according to an exemplary embodiment of the present invention may include a memory 201 and a processor 202, and computer executable instructions are stored in the memory. When the instructions are executed by the processor, the following method is performed: obtaining the configuration of random access resources of two-step random access and data resources of two-step random access based on resource configuration information of an uplink signal; determining the mapping relationship between the random access resources of two-step random access and the data resources of two-step random access based on a predetermined mapping mode between the random access resources of two-step random access and the data resources of two-step random access.

[0107] In addition, the present invention can also be implemented as a computer-readable medium having computer-executable instructions stored thereon. When the instructions are executed, the reference Figure 1 The method described.

[0108] According to the embodiments described above, in general, the base station can send configuration information to the user equipment (the configuration information is the same as described above and will not be repeated here), and detect possible random access preamble code signals on the configured random access opportunities, and can detect uplink signals sent by the user equipment on the configured uplink transmission resources, so as to determine the mapping relationship between random access resources and random access data resources, so that the base station can better detect messages sent by users. More specifically, the configuration of the random access resources of the two-step random access and the data resources of the two-step random access can be obtained by resource configuration information based on the uplink signal, so that the configuration can be further performed based on the obtained configuration of the random access resources and the data resources of the two-step random access; the mapping relationship between the random access resources of the two-step random access and the data resources of the two-step random access can be determined by a predetermined mapping mode between the random access resources of the two-step random access and the data resources of the two-step random access, so that the mapping relationship between the random access resources and the data resources can be determined; in addition, by indicating the configuration type information of one of the two configuration types according to the embodiment of the present invention, the user can obtain the correct configuration type, and the configuration means are enriched compared with the prior art that only has one configuration type; by the mapping period of the random access resources of the two-step random access and the data resources of the two-step random access according to the embodiment of the present invention, the mapping period can be directly determined, so that compared with the method of speculating the mapping period in the prior art, the user can more conveniently determine the mapping pattern, and the mapping period of the specific type according to the embodiment of the present invention can make the mapping period more comprehensive; by the mapping rule between the random access resources of the two-step random access and the data resources of the two-step random access according to the embodiment of the present invention, it can also be guaranteed that there is a complete mapping within a mapping period.

[0109] "User Equipment" or "UE" herein may refer to any terminal with wireless communication capabilities, including but not limited to mobile phones, cellular phones, smart phones or personal digital assistants (PDAs), portable computers, image capture devices such as digital cameras, gaming devices, music storage and playback devices, and any portable unit or terminal with wireless communication capabilities, or Internet facilities that allow wireless Internet access and browsing, etc.

[0110] The term "base station" (BS) or "network equipment" used in this document may refer to eNB, eNodeB, NodeB or base transceiver station (BTS) or gNB, etc., depending on the technology and terminology used.

[0111] The "memory" here can be of any type suitable for the technical environment of this article and can be implemented using any suitable data storage technology, including but not limited to semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory.

[0112] The processor here can be of any type suitable for the technical environment of this article, including but not limited to one or more of the following: a general-purpose computer, a special-purpose computer, a microprocessor, a digital signal processor DSP, and a processor based on a multi-core processor architecture.

[0113] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0114] It will be appreciated by those skilled in the art that the present invention includes devices related to performing one or more of the operations described in the present application. These devices may be specially designed and manufactured for the desired purpose, or may also include known devices in general-purpose computers. These devices have computer programs stored therein, which are selectively activated or reconstructed. Such computer programs may be stored in a device (e.g., computer) readable medium or in any type of medium suitable for storing electronic instructions and coupled to a bus, respectively, the computer readable medium including but not limited to any type of disk (including floppy disk, hard disk, optical disk, CD-ROM, and magneto-optical disk), read-only memory (ROM), random access memory (RAM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), flash memory, magnetic card or optical card. That is, the readable medium includes any medium that stores or transmits information in a readable form by a device (e.g., computer).

[0115] Those skilled in the art will appreciate that each block in these structure diagrams and / or block diagrams and / or flow charts and combinations of blocks in these structure diagrams and / or block diagrams and / or flow charts can be implemented using computer program instructions. Those skilled in the art will appreciate that these computer program instructions can be provided to a general-purpose computer, a professional computer, or a processor of other programmable data processing methods to implement, thereby executing the scheme specified in the block or multiple blocks of the structure diagram and / or block diagram and / or flow chart disclosed in the present invention through the processor of the computer or other programmable data processing method.

[0116] Those skilled in the art will appreciate that the various operations, methods, steps, measures, and schemes discussed in the present invention may be alternated, modified, combined, or deleted. Further, other steps, measures, and schemes in the various operations, methods, and schemes discussed in the present invention may also be alternated, modified, rearranged, decomposed, combined, or deleted. Further, the steps, measures, and schemes in the prior art that are similar to those disclosed in the present invention may also be alternated, modified, rearranged, decomposed, combined, or deleted.

[0117] While the invention has been shown and described with reference to the particular exemplary embodiments, it will be understood by those skilled in the art that various changes in form and details may be made without departing from the spirit and scope of the invention as defined by the claims and their equivalents.

Claims

1. A method performed by a user equipment UE in a wireless communication system, comprising: receiving, from a base station, information associated with a physical random access channel, PRACH, and a physical uplink shared channel, PUSCH, resource of a two-step random access type procedure; Mapping N preamble indices of valid PRACH opportunities to valid PUSCH opportunities and associated demodulation reference signal DMRS resources; as well as Send PUSCH to the base station on valid PUSCH opportunities, Wherein, N is the number of preamble code indices mapped to valid PUSCH opportunities and associated DMRS resources, and is determined based on the following items: The total number of valid PRACH opportunities per mapping pattern period multiplied by the number of preambles per valid PRACH opportunity, and The total number of valid PUSCH opportunities for each PUSCH configuration per mapping pattern period is multiplied by the number of DMRS resource indices for each valid PUSCH opportunity.

2. The method performed by a UE in a wireless communication system according to claim 1, wherein: The information includes a first configuration of random access parameters and a second configuration of PUSCH parameters, The number of preambles for each valid PRACH opportunity is determined based on the first configuration, The number of DMRS resource indexes for each valid PUSCH opportunity is determined based on the second configuration.

3. The method performed by a UE in a wireless communication system according to claim 1, wherein: N is determined as , Among them, T preamble The total number of valid PRACH opportunities for each mapping pattern period multiplied by the number of preambles for each valid PRACH opportunity, T PUSCH The total number of valid PUSCH opportunities configured for each PUSCH in each mapping pattern period is multiplied by the number of DMRS resource indices for each valid PUSCH opportunity.

4. The method performed by a UE in a wireless communication system according to claim 1, wherein: In case a PUSCH opportunity does not map to the preamble of a valid PRACH opportunity, PUSCH is not sent in the PUSCH opportunity.

5. The method performed by a UE in a wireless communication system according to claim 1, wherein: When the number of DMRS resources configured in one PUSCH opportunity is not greater than a threshold, only the DMRS port is configured but not the DMRS sequence.

6. A method performed by a base station in a wireless communication system, comprising: sending information associated with a physical random access channel PRACH and a physical uplink shared channel PUSCH resources of a two-step random access type procedure to a user equipment UE; as well as Receiving PUSCH from the UE on a valid PUSCH opportunity, Among them, N preamble code indices of valid PRACH opportunities are mapped to valid PUSCH opportunities and associated demodulation reference signal DMRS resources, Wherein, N is the number of preamble code indices mapped to valid PUSCH opportunities and associated DMRS resources, and is determined based on the following items: The total number of valid PRACH opportunities per mapping pattern period multiplied by the number of preambles per valid PRACH opportunity, and The total number of valid PUSCH opportunities for each PUSCH configuration per mapping pattern period is multiplied by the number of DMRS resource indices for each valid PUSCH opportunity.

7. The method performed by a base station in a wireless communication system according to claim 6, wherein: The information includes a first configuration of random access parameters and a second configuration of PUSCH parameters, The number of preambles for each valid PRACH opportunity is determined based on the first configuration, The number of DMRS resource indexes for each valid PUSCH opportunity is determined based on the second configuration.

8. The method performed by a base station in a wireless communication system according to claim 6, wherein: N is determined as , Among them, T preamble The total number of valid PRACH opportunities for each mapping pattern period multiplied by the number of preambles for each valid PRACH opportunity, T PUSCH The total number of valid PUSCH opportunities configured for each PUSCH in each mapping pattern period is multiplied by the number of DMRS resource indices for each valid PUSCH opportunity.

9. The method performed by a base station in a wireless communication system according to claim 6, wherein: In case a PUSCH opportunity does not map to the preamble of a valid PRACH opportunity, PUSCH is not sent in the PUSCH opportunity.

10. The method performed by a base station in a wireless communication system according to claim 6, wherein: When the number of DMRS resources configured in one PUSCH opportunity is not greater than a threshold, only the DMRS port is configured but not the DMRS sequence.

11. A user equipment UE in a wireless communication system, comprising: Transceiver; as well as The controller is configured to do the following: receiving, from a base station, information associated with a physical random access channel, PRACH, and a physical uplink shared channel, PUSCH, resource of a two-step random access type procedure; Mapping N preamble indices of valid PRACH opportunities to valid PUSCH opportunities and associated demodulation reference signal DMRS resources; as well as Send PUSCH to the base station on valid PUSCH opportunities, Wherein, N is the number of preamble code indices mapped to valid PUSCH opportunities and associated DMRS resources, and is determined based on the following items: The total number of valid PRACH opportunities per mapping pattern period multiplied by the number of preambles per valid PRACH opportunity, and The total number of valid PUSCH opportunities for each PUSCH configuration per mapping pattern period is multiplied by the number of DMRS resource indices for each valid PUSCH opportunity.

12. The UE in the wireless communication system according to claim 11, wherein: The information includes a first configuration of random access parameters and a second configuration of PUSCH parameters, The number of preambles for each valid PRACH opportunity is determined based on the first configuration, The number of DMRS resource indexes for each valid PUSCH opportunity is determined based on the second configuration.

13. The UE in the wireless communication system according to claim 11, wherein: N is determined as , Among them, T preamble The total number of valid PRACH opportunities for each mapping pattern period multiplied by the number of preambles for each valid PRACH opportunity, T PUSCH The total number of valid PUSCH opportunities configured for each PUSCH in each mapping pattern period is multiplied by the number of DMRS resource indices for each valid PUSCH opportunity.

14. The UE in the wireless communication system according to claim 11, wherein: In case a PUSCH opportunity does not map to the preamble of a valid PRACH opportunity, PUSCH is not sent in the PUSCH opportunity.

15. The UE in the wireless communication system according to claim 11, wherein: When the number of DMRS resources configured in one PUSCH opportunity is not greater than a threshold, only the DMRS port is configured but not the DMRS sequence.

16. A base station in a wireless communication system, comprising: Transceiver; as well as The controller is configured to do the following: sending information associated with a physical random access channel PRACH and a physical uplink shared channel PUSCH resources of a two-step random access type procedure to a user equipment UE; and Receiving PUSCH from the UE on a valid PUSCH opportunity, Among them, N preamble code indices of valid PRACH opportunities are mapped to valid PUSCH opportunities and associated demodulation reference signal DMRS resources, Wherein, N is the number of preamble code indices mapped to valid PUSCH opportunities and associated DMRS resources, and is determined based on the following items: The total number of valid PRACH opportunities per mapping pattern period multiplied by the number of preambles per valid PRACH opportunity, and The total number of valid PUSCH opportunities for each PUSCH configuration per mapping pattern period is multiplied by the number of DMRS resource indices for each valid PUSCH opportunity.

17. The base station in the wireless communication system according to claim 16, wherein: The information includes a first configuration of random access parameters and a second configuration of PUSCH parameters, The number of preambles for each valid PRACH opportunity is determined based on the first configuration, The number of DMRS resource indexes for each valid PUSCH opportunity is determined based on the second configuration.

18. The base station in the wireless communication system according to claim 16, wherein: N is determined as , Among them, T preamble The total number of valid PRACH opportunities for each mapping pattern period multiplied by the number of preambles for each valid PRACH opportunity, T PUSCH The total number of valid PUSCH opportunities configured for each PUSCH in each mapping pattern period is multiplied by the number of DMRS resource indices for each valid PUSCH opportunity.

19. The base station in the wireless communication system according to claim 16, wherein: In case a PUSCH opportunity does not map to the preamble of a valid PRACH opportunity, PUSCH is not sent in the PUSCH opportunity.

20. The base station in the wireless communication system according to claim 16, wherein: When the number of DMRS resources configured in one PUSCH opportunity is not greater than a threshold, only the DMRS port is configured but not the DMRS sequence.

21. A computer-readable medium having computer-executable instructions stored thereon, wherein when the instructions are executed, the method according to any one of claims 1 to 10 is executed.

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