Method, User Equipment, and Base Station Equipment for Unscheduled Uplink Transmission

Abstract

The present disclosure provides a scheduling-free uplink transmission method, which is executed on the user equipment side and includes: determining a radio network temporary identifier GF-RNTI for scheduling-free uplink transmission according to configuration information received from a base station, and sending an uplink signal; and searching for feedback from the base station in a downlink control channel by using the determined GF-RNTI. The present disclosure also provides a user equipment and a base station for scheduling-free uplink transmission.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless communication systems, and particularly to a method for unscheduled uplink transmission, and a user equipment and a base station equipment thereof. Background Art

[0002] With the rapid development of the information industry, especially the growing demand from the mobile Internet and the Internet of Things (IoT), unprecedented challenges have been brought to future mobile communication technologies. For example, according to the report ITU-R M.[IMT.BEYOND2020.TRAFFIC] of the International Telecommunication Union ITU, it is expected that by 2020, the mobile traffic will increase nearly 1000 times compared with 2010 (the 4G era), and the number of user equipment connections will also exceed 17 billion. As a large number of IoT devices gradually penetrate into the mobile communication network, the number of connected devices will be even more astonishing. To address these unprecedented challenges, the communication industry and academia have launched extensive research on the fifth-generation mobile communication technology (5G) for the 2020s. Currently, in the report ITU-R M.[IMT.VISION] of the ITU, the framework and overall goals of future 5G are being discussed, and the demand outlook, application scenarios, and various important performance indicators of 5G are described in detail. For the new requirements in 5G, the report ITU-R M.[IMT.FUTURE TECHNOLOGY TRENDS] of the ITU provides information related to the technical trends of 5G, aiming to solve significant problems such as a significant increase in system throughput, user experience consistency, scalability to support IoT, latency, energy efficiency, cost, network flexibility, support for emerging services, and flexible spectrum utilization.

[0003] Facing the more diverse service scenarios of 5G, flexible multiple access technologies are needed to support different scenarios and service requirements. For example, in the face of the service scenario of massive connections, how to connect more users with limited resources has become the core problem that 5G multiple access technologies need to solve. In the current 4G LTE network, the multiple access technology mainly adopted is based on Orthogonal Frequency Division Multiplexing (OFDM). However, the existing orthogonal-based access methods are obviously difficult to meet the 5G requirements of increasing the spectrum efficiency by 5 to 15 times and achieving millions of user connections per square kilometer. The Non-orthogonal Multiple Access (NoMA) technology can greatly increase the number of supported user connections by multiplexing the same resources among multiple users. Since users have more opportunities to access, the overall network throughput and spectrum efficiency are improved. In addition, in the face of the massive machine type communication (mMTC) scenario, considering the cost and implementation complexity of the terminals, a multiple access technology with simpler operation and processing may be required. In the face of low-latency or low-power service scenarios, the non-orthogonal multiple access technology can better achieve access without scheduling competition, realize low-latency communication, and reduce the startup time and device power consumption.

[0004] The non-orthogonal multiple access technologies currently under major research include Multiple User Shared Access (MUSA), Non-Orthogonal Multiple Access (NOMA), Pattern Division Multiple Access (PDMA), Sparse Code Multiple Access (SCMA), and Interleave Division Multiple Access (IDMA), etc. Among them, MUSA distinguishes users by relying on codewords, SCMA distinguishes users by relying on codebooks, NOMA distinguishes users by power, PDMA distinguishes users by different characteristic patterns, and IDMA distinguishes different users by interleaved sequences.

[0005] When a user equipment (UE) is in the connected state, that is, the UE has accessed the network and obtained the cell-radio network temporary identity (C-RNTI) configured by the network device. Therefore, the user can detect whether the received downlink control information is for itself based on this C-RNTI. However, when the UE is in the non-connected state, especially when the UE performs grant-free uplink transmission, how to determine the grant-free uplink transmission time-frequency resources or what kind of identifier to use to check whether the downlink control channel information belongs to itself is a problem to be solved. Summary of the Invention

[0006] In view of this, according to one aspect, the present disclosure provides a grant-free uplink transmission method, which is executed on the user equipment side and includes: determining a grant-free radio network temporary identity (GF-RNTI) for grant-free uplink transmission according to the configuration information received from the base station, and sending an uplink signal; and searching for feedback from the base station in the downlink control channel by using the determined GF-RNTI.

[0007] According to an embodiment of the present disclosure, the method further includes determining first information according to the configuration information received from the base station for grant-free uplink transmission, where the first information includes at least one of: grant-free uplink transmission time-frequency resources, grant-free preamble, demodulation reference signal (DMRS), and multiple access signature (MAS).

[0008] According to an embodiment of the present disclosure, the configuration information includes at least one of the following: a set of grant-free uplink transmission time-frequency resources; a mapping relationship between grant-free uplink transmission time-frequency resources and downlink beams; a mapping relationship between at least one of a grant-free preamble, DMRS, and multiple access signature resources and downlink beams; a resource pool of GF-RNTI; a mapping relationship between GF-RNTI and at least one of grant-free uplink transmission time-frequency resources, grant-free preamble, DMRS, and multiple access signature resources; a configuration of a control resource set and / or a search space for the UE to search for grant-free uplink transmission feedback; the maximum number of transmissions for grant-free uplink transmission; and the maximum transmission time for grant-free uplink transmission.

[0009] According to an embodiment of the present disclosure, determining the GF-RNTI for grant-free uplink transmission includes at least one of the following: determining a GF-RNTI resource pool according to the configuration information, and selecting a GF-RNTI from the GF-RNTI resource pool as the GF-RNTI for grant-free uplink transmission; determining the GF-RNTI for grant-free uplink transmission according to the first information; and when determining the grant-free uplink transmission time-frequency resources based on the configured random access time-frequency resources, calculating the radio network temporary identity (RA-RNTI) on the corresponding random access channel as the GF-RNTI.

[0010] According to an embodiment of the present disclosure, determining the GF-RNTI for grant-free uplink transmission based on the first information includes at least one of the following: determining the GF-RNTI for grant-free uplink transmission according to the determined first information and the mapping relationship between the GF-RNTI and the first information; and calculating the GF-RNTI for grant-free uplink transmission according to the first information.

[0011] According to an embodiment of the present disclosure, calculating the GF-RNTI for grant-free uplink transmission according to the first information includes: calculating the GF-RNTI for grant-free uplink transmission according to at least one of the index of the grant-free uplink transmission opportunity GFO where the determined grant-free uplink transmission time-frequency resource is located, the time unit index, the orthogonal frequency division multiplexing OFDM symbol index, the subframe index, and the carrier index.

[0012] According to an embodiment of the present disclosure, determining at least one of the grant-free uplink transmission time-frequency resource, the grant-free preamble, the demodulation reference signal DMRS, and the multiple access signature MAS includes: determining the downlink beam, and determining at least one of the grant-free uplink transmission time-frequency resource, the grant-free preamble, the demodulation reference signal DMRS, and the multiple access signature MAS according to the determined downlink beam and the mapping relationship between at least one of the grant-free uplink transmission time-frequency resource, the grant-free preamble, the demodulation reference signal DMRS, and the multiple access signature MAS and the downlink beam; and determining at least one of the grant-free uplink transmission time-frequency resource, the grant-free preamble, the demodulation reference signal DMRS, and the multiple access signature MAS according to the determined GF-RNTI and the mapping relationship between the GF-RNTI and at least one of the grant-free uplink transmission time-frequency resource, the grant-free preamble, the demodulation reference signal DMRS, and the multiple access signature MAS.

[0013] According to an embodiment of the present disclosure, the grant-free uplink transmission time-frequency resource set is determined by at least one of the following methods: determining by an indication of at least one of the number of time units and the starting position of the time units, the number of frequency domain units and the starting position of the frequency domain units, and the time-frequency resource repetition period; determining by an indication of the index of the grant-free uplink transmission opportunity GFO; and determining by an indication of the relative position with respect to the configured random access time-frequency resource.

[0014] According to an embodiment of the present disclosure, the indication of the relative position with respect to the configured random access time-frequency resource includes: indicating the relative position information in the frequency domain, the relative position information in the time domain, or the relative position information in the code domain between the grant-free uplink transmission time-frequency resource and the configured random access time-frequency resource.

[0015] According to an embodiment of the present disclosure, the relative position information indicated in the frequency domain includes the size of the frequency domain interval between the grant-free uplink transmission time-frequency resource and the random access resource indicated in the configuration information and the number of GFQs indicated in the frequency domain; the time division includes the size of the time interval between the grant-free uplink transmission time-frequency resource and the random access resource indicated in the configuration information and the number of GFQs indicated in the time domain; the code division includes indicating part or all of the random access resources as the grant-free uplink transmission time-frequency resource and indicating the preamble index or index range used in the grant-free uplink transmission.

[0016] According to an embodiment of the present disclosure, the relative position information indicated in the frequency domain is implemented by at least one of the following methods: a random access opportunity (RO) and a grant-free uplink transmission opportunity (GFO) are frequency division multiplexed, and the time-division preamble and data part are respectively transmitted in one GFO; multiple time-division random access opportunities (ROs) and a grant-free uplink transmission opportunity (GFO) are frequency division multiplexed, and the time-division or frequency-division preamble and data part are respectively transmitted in one GFO; and a random access opportunity (RO) and a grant-free uplink transmission opportunity (GFO) are frequency division multiplexed, and the frequency-division preamble and data part are respectively transmitted in one GFO.

[0017] According to an embodiment of the present disclosure, the relative position information indicated in the time domain is implemented by at least one of the following methods: a random access opportunity (RO) and a grant-free uplink transmission opportunity (GFO) are time division multiplexed, and the time-division preamble and data part are respectively transmitted in one GFO; multiple frequency-division random access opportunities and a grant-free uplink transmission opportunity are time division multiplexed, and the time-division or frequency-division preamble and data part are respectively transmitted in one GFO; and a random access opportunity (RO) and a grant-free uplink transmission opportunity (GFO) are time division multiplexed, and the frequency-division preamble and data part are respectively transmitted in one GFO.

[0018] According to an embodiment of the present disclosure, the mapping relationship between the grant-free uplink transmission time-frequency resource and the downlink beam is obtained by at least one of the following methods: configuring a separate mapping relationship between the grant-free uplink transmission time-frequency resource and the downlink beam; reusing the mapping relationship between the random access time-frequency resource and the downlink beam; and if no separate mapping relationship between the grant-free uplink transmission time-frequency resource and the downlink beam is configured, then reusing the mapping relationship between the random access time-frequency resource and the downlink beam; otherwise, using the configured separate mapping relationship between the grant-free uplink transmission time-frequency resource and the downlink beam.

[0019] According to an embodiment of the present disclosure, the mapping relationship between at least one of the grant-free preamble, DMRS, and multi-access signature resource and the downlink beam is obtained by at least one of the following methods:

[0020] Configure the mapping relationship of at least one of a dedicated grant-free preamble, DMRS, and multi-access signature resource to a downlink beam;

[0021] Reuse the mapping relationship between the random access preamble and the downlink beam to obtain the preamble for grant-free uplink transmission, and obtain the DMRS and multi-access signature resources for grant-free uplink transmission through the mapping relationship between the preamble for grant-free uplink transmission and the DMRS and multi-access signature resources;

[0022] Reuse the mapping relationship between the random access preamble and the downlink beam to obtain the preamble for grant-free uplink transmission, and use the configured mapping relationship of at least one of a dedicated grant-free preamble, DMRS, and multi-access signature resource to the downlink beam to obtain the DMRS and multi-access signature resources for grant-free uplink transmission; and

[0023] If the mapping relationship of at least one of a dedicated grant-free preamble, DMRS, and multi-access signature resource to the downlink beam is not configured, then reuse the mapping relationship between the random access preamble and the downlink beam and combine the mapping relationship between the preamble for grant-free uplink transmission and the DMRS and multi-access signature resources; otherwise, use the configured mapping relationship of at least one of a dedicated grant-free preamble, DMRS, and multi-access signature resource to the downlink beam.

[0024] According to another aspect, the present disclosure also provides a grant-free uplink transmission method, which is executed on the base station device side and includes: sending configuration information for determining a radio network temporary identity GF-RNTI for grant-free uplink transmission to the user equipment side; and detecting the signal transmission of the user on the configured grant-free uplink transmission time-frequency resource, and performing downlink feedback on the successfully detected and decoded signal transmission, and using the GF-RNTI corresponding to the successfully detected and decoded signal transmission in the downlink feedback.

[0025] According to an embodiment of the present disclosure, the configuration information includes at least one of the following: a set of grant-free uplink transmission time-frequency resources; the mapping relationship between the grant-free uplink transmission time-frequency resource and the downlink beam; the mapping relationship of at least one of a grant-free preamble, DMRS, and multi-access signature resource to the downlink beam; a resource pool of GF-RNTI; the mapping relationship between GF-RNTI and at least one of a grant-free uplink transmission time-frequency resource, a grant-free preamble, DMRS, and multi-access signature resource; the configuration of a control resource set and / or search space for the UE to search for grant-free uplink transmission feedback; the maximum number of transmissions for grant-free uplink transmission; and the maximum transmission time for grant-free uplink transmission.

[0026] According to an embodiment of the present disclosure, the configuration information is further used to determine at least one of a grant-free uplink transmission time-frequency resource, a grant-free preamble, a demodulation reference signal DMRS, and a multi-access signature MAS.

[0027] According to another aspect, the present disclosure also provides a user equipment for grant-free uplink transmission, including a memory and a processor. Computer-executable instructions are stored on the memory. When the instructions are executed by the processor, any method executed on the user equipment side described in the embodiments of the present disclosure is performed.

[0028] According to another aspect, the present disclosure also provides a base station device for grant-free uplink transmission, including a memory and a processor. Computer-executable instructions are stored on the memory. When the instructions are executed by the processor, any method executed on the base station device side described in the embodiments of the present disclosure is performed.

[0029] According to another aspect, the present disclosure also provides a computer-readable medium, on which computer-executable instructions are stored. When the instructions are executed, any method described in the embodiments of the present disclosure is performed.

[0030] In the present disclosure, the user equipment can determine the resource configuration for grant-free uplink transmission, such as available time-frequency resources, and / or preambles, and / or demodulation reference signals, and / or multiple access signature resources, etc., through the configuration information of the network device. At the same time, the user equipment can also determine the temporary identifier used to search for the downlink feedback from the base station device, thereby providing a complete method for grant-free uplink transmission for the user equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Through the following description of the embodiments of the present disclosure with reference to the drawings, the above and other objects, features, and advantages of the present disclosure will become clearer. In the drawings:

[0032] Figure 1 A schematic diagram showing a grant-free uplink transmission method executed on the user equipment side according to an embodiment of the present invention;

[0033] Figure 2 A schematic diagram showing a grant-free uplink transmission method executed on the base station device side according to an embodiment of the present invention;

[0034] Figure 3 A schematic diagram showing the interaction between the user equipment and the base station device during grant-free uplink transmission according to an embodiment of the present invention;

[0035] Figure 4 A schematic diagram showing the frequency division of the random access opportunity and the grant-free uplink transmission opportunity according to an embodiment of the present invention;

[0036] Figure 5 A schematic diagram showing the time division of the random access opportunity and the grant-free uplink transmission opportunity according to an embodiment of the present invention;

[0037] Figure 6Shows an example diagram of the mapping relationship between the unscheduled uplink transmission time-frequency resources and the downlink beam provided according to an embodiment of the present invention;

[0038] Figure 7 Shows a block diagram of a user equipment provided according to an embodiment of the present invention;

[0039] Figure 8 Shows a block diagram of a base station device provided according to an embodiment of the present invention;

[0040] Figure 9 Shows a schematic diagram of determining the uplink transmission resource situation according to an embodiment of the present invention;

[0041] Figure 10 Shows a schematic diagram of determining the uplink transmission resource situation according to another embodiment of the present invention;

[0042] Figure 11 Shows a schematic diagram of partial time-domain sharing of the two-step random access time-frequency resources provided according to an embodiment of the present invention;

[0043] Figure 12 Shows a schematic diagram of partial frequency-domain sharing of the two-step random access time-frequency resources provided according to an embodiment of the present invention;

[0044] Figure 13 Shows a schematic diagram of partial time-frequency domain sharing of the two-step random access time-frequency resources provided according to an embodiment of the present invention;

[0045] Figure 14 Shows a schematic diagram of the two-step random access time-frequency resource confirmation method provided according to an embodiment of the present invention; and

[0046] Figure 15 Shows a schematic diagram of the two-step random access time-frequency resource confirmation method provided according to an embodiment of the present invention. Detailed implementation manners

[0047] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are merely exemplary 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 unnecessarily obscuring the concepts of the present disclosure.

[0048] Those skilled in the art can understand that, unless specifically stated otherwise, the singular forms "a", "an", "the" and "said" used herein may also include the plural forms. It should be further understood that the term "comprising" used in the specification of the present invention means the presence of the stated 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 their groups. It should be understood that when we say that an element is "connected" or "coupled" to another element, it can be directly connected or coupled to other elements, or there may also be intermediate elements. In addition, the "connection" or "coupling" used herein may include wireless connection or wireless coupling. The phrase "and / or" used herein includes all or any unit and all combinations of one or more of the associated listed items.

[0049] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of those of ordinary skill in the art to which the present invention pertains. It should also be understood that terms such as those defined in a general dictionary should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted with an idealized or overly formal meaning unless specifically defined as here.

[0050] Those skilled in the art can understand that the "terminal" and "terminal device" used herein include both devices with a wireless signal receiver that only has the ability to receive and no ability to transmit, and devices with receiving and transmitting hardware that have the receiving and transmitting hardware capable of two-way communication on a two-way communication link. Such devices may include: cellular or other communication devices, which may have a single-line display or a multi-line display or a cellular or other communication device without a multi-line display; PCS (Personal Communications Service), which may combine voice, data processing, fax, and / or data communication capabilities; PDA (Personal Digital Assistant), which may include a radio frequency receiver, a pager, Internet / intranet access, a web browser, a notepad, a calendar, and / or a GPS (Global Positioning System) receiver; conventional laptop and / or palm computers or other devices, which are conventional laptop and / or palm computers or other devices with and / or including a radio frequency receiver. The "terminal" and "terminal device" used herein may be portable, transportable, installed in a vehicle (air, sea, and / or land), or suitable for and / or configured to operate locally and / or in a distributed manner at any other location on the earth and / or in space. The "terminal" and "terminal device" used herein may also be a communication terminal, an Internet access terminal, a music / video playback terminal, such as a PDA, a MID (Mobile Internet Device), and / or a mobile phone with music / video playback function, or may also be devices such as a smart TV, a set-top box, etc.

[0051] The time unit in the present invention may be: an OFDM symbol, a group of OFDM symbols (composed of multiple OFDM symbols), a time slot, a group of time slots (composed of multiple time slots), a subframe, a group of subframes (composed of multiple subframes), a system frame, a group of system frames (composed of multiple system frames); it may also be an absolute time unit, such as 1 millisecond, 1 second, etc.; the time unit may also be a combination of multiple granularities, such as N1 time slots plus N2 OFDM symbols.

[0052] The frequency domain units in the present invention can be: a subcarrier, a group of subcarriers (composed of multiple subcarriers), a resource block (RB), which can also be referred to as a physical resource block (PRB), a group of resource blocks (composed of multiple RBs), a bandwidth part (BWP), a group of bandwidth parts (composed of multiple BWPs), a frequency band / carrier, a group of frequency bands / carrier groups; 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, for example, M1 PRBs plus M2 subcarriers.

[0053] In order to make the objectives, technical means, and advantages of the present application clearer, the following further elaborates on the present application in detail with reference to the accompanying drawings and specific embodiments.

[0054] Figure 1 Schematic diagram showing the grant-free uplink transmission method 100 executed on the user equipment side according to an embodiment of the present invention.

[0055] The method 100 includes step S101 of determining a grant-free radio network temporary identity (GF-RNTI) for grant-free uplink transmission according to the configuration information received from the base station for grant-free uplink transmission and sending an uplink signal.

[0056] In this embodiment, the configuration information for grant-free uplink transmission may include at least one of the following: the time-frequency resource set for grant-free uplink transmission; the mapping relationship between the time-frequency resources for grant-free uplink transmission and the downlink beam; the mapping relationship between at least one of the grant-free preamble, de-modulation reference signal (DMRS), and multiple access signature resource (MAS) and the downlink beam; the resource pool of GF-RNTI; the mapping relationship between GF-RNTI and at least one of the time-frequency resources for grant-free uplink transmission, the grant-free preamble, DMRS, and multiple access signature resources; the configuration of the control resource set and / or search space for the UE to search for grant-free uplink transmission feedback; the maximum number of transmissions for grant-free uplink transmission; and the maximum transmission time for grant-free uplink transmission.

[0057] In this embodiment, according to the configuration information received from the base station for grant-free uplink transmission, other configurations for grant-free uplink transmission can also be determined, including determining at least one of the time-frequency resources for grant-free uplink transmission, the grant-free preamble, the de-modulation reference signal DMRS, and the multiple access signature MAS.

[0058] The method further includes step S102 of searching for feedback from the base station in the downlink control channel by using the determined GF-RNTI and performing further operations according to the content of the feedback.

[0059] This embodiment provides a way to determine the GF-RNTI, which is convenient for idle users to search for downlink feedback. At the same time, it also provides ways to determine time-frequency resources, preambles, etc. for unscheduled uplink transmission.

[0060] Figure 2 A schematic diagram showing an unscheduled uplink transmission method 200 executed on the base station device side according to an embodiment of the present invention.

[0061] The method 200 includes step S201 of sending configuration information to the user equipment side. According to the configuration information, a radio network temporary identifier (GF-RNTI) for unscheduled uplink transmission can be determined; other configurations for unscheduled uplink transmission can also be determined, including determining at least one of time-frequency resources for unscheduled uplink transmission, an unscheduled preamble, a demodulation reference signal DMRS, and a multi-access signature MAS.

[0062] The configuration information includes at least one of the following: sending configuration information to the user equipment side, and the configuration information includes at least one of the following: a set of time-frequency resources for unscheduled uplink transmission; a mapping relationship between time-frequency resources for unscheduled uplink transmission and downlink beams; a mapping relationship between at least one of an unscheduled preamble, DMRS, and multi-access signature resources and downlink beams; a resource pool of GF-RNTI; a mapping relationship between GF-RNTI and at least one of time-frequency resources for unscheduled uplink transmission, an unscheduled preamble, DMRS, and multi-access signature resources; a configuration of a control resource set and / or a search space for the UE to search for unscheduled uplink transmission feedback; the maximum number of transmissions for unscheduled uplink transmission; and the maximum transmission time for unscheduled uplink transmission.

[0063] In addition, the configuration information may further include the number N of times a user can repeatedly send data when performing a single grant-free uplink transmission. That is, each time the UE performs a grant-free uplink transmission, the UE will repeatedly send the data N times. For example, for each transmission, the UE repeatedly sends the data N = 4 times. In some embodiments, the data may be the data part in the grant-free transmission, or the whole including the preamble and the data part. In some embodiments, the number N of times of repeatedly sending data may be related to the size of the data to be sent by the UE or the size of the resources configured by the base station device. For example, there are four transmit block sizes (TBS), namely TBS1, TBS2, TBS3, and TBS4, and TBS1 < TBS2 < TBS3 < TBS4, then there are different choices for the corresponding number of times of repeatedly sending data, such as one-to-one correspondence with N1 < N2 < N3 < N4. In some embodiments, multiple TBSs may correspond to the same N value. The configuration information may include one or more threshold values. When the TBS exceeds the threshold, and / or the size of the resources configured by the base station device is greater than the threshold value, the UE determines the corresponding N value, such as a larger N value.

[0064] The method includes step S202 of detecting the signal transmission of the user on the configured grant-free uplink transmission time-frequency resources and performing downlink feedback on the successfully detected and decoded signal transmission, and using the GF-RNTI corresponding to the successfully detected and decoded signal transmission in the downlink feedback.

[0065] Figure 3 The figure shows an interaction schematic diagram between a user equipment and a base station device when performing grant-free uplink transmission according to an embodiment of the present invention.

[0066] Specifically, the base station sends the configuration information for grant-free uplink transmission to the user equipment through a downlink channel (such as the downlink control channel PDCCH, the downlink shared channel PDSCH, or the downlink broadcast channel PBCH). The configuration information for grant-free uplink transmission includes at least one of the following (1)-(8):

[0067] (1) The time-frequency resource set for grant-free uplink transmission

[0068] The time-frequency resource set can be determined by at least one of the following methods:

[0069] ◆ Clearly indicate at least one of the following: the number of time units and the starting position of the time units; the number of frequency domain units and the starting position of the frequency domain units; the time-frequency resource repetition period, such as the configured resources are repeated every 10 ms, that is, the time-frequency resource configuration information is configured according to each time-frequency resource repetition period.

[0070] ◆ Clearly indicate the index of the grant-free transmission occasion (GFO), i.e., the GFO index. A GFO is defined as the time-frequency resource for transmitting one or more specific transmit block sizes (TBS), and / or one or more specific MCSs, and / or one or more specific preamble formats, and / or one or more specific DMRS formats, and / or one or more specific MASs, which consists of M time units and N frequency domain units; according to different types and / or numbers of TBS, MCS, preamble format, DMRS format, MAS, the size of the time-frequency resource represented by the corresponding GFO is different.

[0071] In some embodiments, a multi-level time unit relationship can be indicated. For example, first indicate the slot index of the grant-free uplink transmission time-frequency resource, then indicate the starting position of the OFDM symbol of the GFO in each slot, and the number of GFOs; the configuration of the GFOs in each slot can be the same; the GFOs in each slot can be continuous, that is, only the starting position of the OFDM symbol of the first GFO and the number of GFOs in a slot need to be notified, and the positions of other GFOs in this slot can be inferred.

[0072] ◆ Determine the time-frequency resource of the grant-free uplink transmission by indicating the relative position with the configured random access time-frequency resource. In some embodiments, the random access time-frequency resource can be directly configured by the system information RMSI (such as directly indicated in the random access configuration table), or can be the final effective random access resource obtained by inference (such as excluding some unavailable random access resources considering conflicts with downlink transmission, conflicts with SSB, and inability to meet the complete mapping requirements, etc., and the remaining effective random access resources).

[0073] Indicating the relative position with the configured random access time-frequency resource includes: indicating the relative position information in the frequency domain, in the time domain, or in the code domain between the grant-free uplink transmission time-frequency resource and the configured random access time-frequency resource. That is, the grant-free uplink transmission time-frequency resource and the configured random access time-frequency resource are frequency division, time division, or code division, and the specific description is as follows:

[0074] ① Frequency division between the grant-free uplink transmission time-frequency resource and the configured random access time-frequency resource

[0075] Indicate the frequency-domain interval size between the unscheduled uplink transmission time-frequency resources and the random access resources in the configuration information. For example, indicate that the frequency-domain starting position of the unscheduled uplink transmission resources and the interval from the lowest subcarrier in the lowest PRB of the random access resources is W frequency-domain units. In the configuration information, the number of GFOs in the frequency domain can also be indicated. For example, there are Z consecutive GFOs in the frequency domain.

[0076] Figure 4 The following three frequency-division cases (a)-(c) of the random access opportunity (RACH occasion, RO) and the unscheduled uplink transmission opportunity are shown.

[0077] (a) One RO is frequency-divided with one GFO. The preamble and data parts are transmitted in a time-division manner in one GFO respectively; the data part can be composed of DMRS and data; in some embodiments, there can be only the data part, that is, all GFO resources are used to send the data part.

[0078] (b) Multiple X (X>1) time-division ROs are frequency-divided with one GFO. The preamble and data parts are transmitted in one GFO respectively, and the preamble and data parts can be frequency-divided or time-divided. Taking time-division as an example, the preamble is sent within the resource size of the first X1 ROs in the GFO, and the data part is sent within the resource size of X2 = X - X1 ROs; taking 2 ROs as an example, X1 = 1, that is, the UE sends the preamble within the resource of the size of the first RO in the GFO; the data part is sent within the resource of the size of X2 = 1 RO in the GFO; the data part can be composed of DMRS and data; in some embodiments, there can be only the data part, that is, all GFO resources are used to send the data part.

[0079] (c) One RO is frequency-divided with one GFO. The preamble and data parts are transmitted in a frequency-division manner in one GFO respectively, and the data part can be composed of DMRS and data; in some embodiments, there can be only the data part, that is, all GFO resources are used to send the data part.

[0080] The time-frequency resources of the unscheduled uplink transmission are time-division with the configured random access time-frequency resources

[0081] In the configuration information, the time interval size between the unscheduled uplink transmission time-frequency resources and the random access resources can be indicated. For example, indicate that the time starting position of the unscheduled uplink transmission resources and the time interval from the random access resources is: the interval from the last OFDM symbol in the last RO in a time slot is W time units; and / or the time interval between the time slot where the RO is located and the time slot where the GFO is located, and the starting OFDM symbol position of the GFO in the time slot where it is located; and in the configuration information, the number of GFOs in the time domain can also be indicated. For example, there are Z consecutive GFOs in time.

[0082] Figure 5 The following three time-division cases (a)-(c) of the random access opportunity and the grant-free uplink transmission opportunity are shown.

[0083] (a) One RO is time-divided with one GFO. The preamble and data parts are transmitted separately in one GFO; the data part may consist of DMRS and data; in some embodiments, there may be only the data part, that is, all GFO resources are used to transmit the data part.

[0084] (b) Multiple X (X>1) frequency-division ROs are time-divided with one GFO. The preamble and data parts are transmitted separately in one GFO, and the preamble and data parts may be frequency-divided or time-divided. Taking frequency division as an example, the preamble is transmitted within the resource size of X1 ROs in the GFO, and the data part is transmitted within the resource size of the following X2 = X - X1 ROs; taking 2 ROs as an example, X1 = 1, that is, the UE transmits the preamble within the resource of the size of 1 RO in the upper part of the GFO; the data part is transmitted within the resource of the remaining X2 = 1 RO size in the GFO; the data part may consist of DMRS and data; in some embodiments, there may be only the data part, that is, all GFO resources are used to transmit the data part.

[0085] (c) One RO is time-divided with one GFO. The frequency-divided preamble and data parts are transmitted separately in one GFO, and the data part may consist of DMRS and data; in some embodiments, there may be only the data part, that is, all GFO resources are used to transmit the data part.

[0086] ③ The time-frequency resources of the grant-free uplink transmission are code-divided from the configured random access time-frequency resources

[0087] In the configuration information, it is indicated that some or all of the random access resources can be used as the time-frequency resources of the grant-free uplink transmission. For example, it is indicated that the corresponding RO index is the available grant-free uplink transmission resource. However, the configuration information can also indicate the preamble index or index range used in the grant-free uplink transmission. For example, the preambles used for random access are the 0th to the M_ra - 1th preambles generated in the manner that the root sequence index is X and the cyclic shift is Y, and the M_ra th to the M_ra + M_gf - 1th preambles generated in the manner that the root sequence index is X and the cyclic shift is Y are used for the grant-free uplink transmission.

[0088] (2) The mapping relationship between the time-frequency resources of the grant-free uplink transmission and the downlink beam

[0089] The downlink beam may be an index of a synchronization signal / physical broadcast channel block (SSB), or an index of a channel state information-reference signal (CSI-RS). Here, the SSB is mainly used as an example for description, and its mapping relationship includes at least one of the following methods:

[0090] ◆ Configure the mapping relationship between the time-frequency resources of the unscheduled uplink transmission and the downlink beam.

[0091] Define the number of SSBs in each GFO, that is, numOfSSBperGFO. Through the number of SSBs configured by the network base station, the UE can infer the number of SSBs that can be mapped on a GFO. According to the principle of time-domain priority or frequency-domain priority, after selecting the SSB, the UE can infer the available GFO through the mapping relationship. For example, the network configures 4 SSBs, and at this time there are 4 GFOs in one period, 2 in the frequency domain and 2 in the time domain, as Figure 6 shown, Figure 6 FIG. shows a time-division schematic diagram of the random access opportunity and the unscheduled uplink transmission opportunity provided by an embodiment of the present invention. And the configured numOfSSBperGFO = 2, which means that 2 SSBs are mapped on one GFO. Taking the principle of frequency-domain priority as an example, the UE can infer that the GFO indexes corresponding to SSB1 and SSB2 are GFO1 and GFO3, and the GFO indexes corresponding to SSB3 and SSB4 are GFO2 and GFO4.

[0092] ◆ Reuse the mapping relationship between the random access time-frequency resources and the downlink beam.

[0093] For example, when there is a certain relative relationship (such as time division, frequency division, code division, etc.) between the time-frequency resources of the unscheduled uplink transmission and the random access time-frequency resources, the mapping relationship between the random access time-frequency resources and the downlink beam can be reused to find the corresponding time-frequency resources of the unscheduled uplink transmission;

[0094] ◆ A combination of the above two methods.

[0095] When the network base station does not configure the mapping relationship between the time-frequency resources of the unscheduled uplink transmission and the downlink beam, the UE uses the mapping relationship between the random access time-frequency resources and the downlink beam as the time-frequency resources of the unscheduled uplink transmission corresponding to the determined SSB. When the network base station configures the mapping relationship between the time-frequency resources of the unscheduled uplink transmission and the downlink beam, the UE uses the configured mapping relationship between the time-frequency resources of the unscheduled uplink transmission and the downlink beam as the time-frequency resources of the unscheduled uplink transmission corresponding to the determined SSB.

[0096] (3) Mapping relationship between preambles and / or demodulation reference signals (DMRS) and / or multiple access signatures (MAS) resources for unscheduled uplink transmission and downlink beams

[0097] In this embodiment, M_code is used to represent the maximum number of preambles available for unscheduled uplink transmission on a GFO, and / or the maximum number of demodulation reference signals (DMRS), and / or the maximum number of multiple access signatures (MAS). This maximum number can be the maximum number available configured by the system or the maximum physically available number.

[0098] In this embodiment, the multiple access signature can be a combination of one or more of the following: bit-level spreading sequence, bit-level interleaving sequence, bit-level scrambling sequence, bit-level to symbol-level codeword or codebook, symbol-level spreading sequence, symbol-level scrambling sequence, symbol-level interleaving sequence, symbol to resource element (RE) mapping codebook or pattern; power factor, phase factor, etc. In some embodiments, the spreading sequence can be a complex spreading sequence or a sparse spreading sequence, i.e., a spreading sequence containing zero values. In some embodiments, the bit-level to symbol-level codeword or codebook can be a sparse bit-level to symbol-level codeword or codebook, i.e., a bit-level to symbol-level codeword or codebook with zero values. In some embodiments, the symbol to RE mapping codebook or pattern can be a sparse symbol to RE mapping codebook or pattern, i.e., some REs are not mapped with symbols.

[0099] In this embodiment, the mapping relationship includes at least one of the following methods:

[0100] ◆ Configure a separate mapping relationship between preambles and / or DMRS and / or multiple access signature resources for unscheduled uplink transmission and downlink beams.

[0101] Define the number of SSBs in each GFO, i.e., numOfSSBperGFO. Through the number of SSBs configured by the network base station, the UE can infer the number of SSBs that can be mapped on a GFO. Through the principle of time domain priority or frequency domain priority, the UE can infer the available GFO through the mapping relationship after selecting the SSB. Then divide M_code into numOfSSBperGFO groups, each group corresponding to one SSB. Taking the DMRS sequence as an example, if the maximum DMRS sequence available on a GFO is M_code=12, and numOfSSBperGFO=2, the UE can know that there are 2 SSBs mapped on this GFO, and each SSB corresponds to 6 DMRS sequences. If SSB1 and SSB2 are taken as examples, it can be known that SSB1 corresponds to DMRS 0~5, and SSB2 corresponds to DMRS 6~11. In particular, SSB can also determine the corresponding DMRS according to a certain interval rule, such as SSB1 corresponds to DMRS even index (DMRS 0, 2, 4, 6, 8, 10), SSB2 corresponds to DMRS odd index (DMRS 1, 3, 5, 7, 9, 11); In particular, SSB can also determine the corresponding DMRS according to a certain root sequence index (sequential root sequence), such as SSB1 corresponds to the DMRS sequence generated by root sequence 1, and SSB corresponds to the DMRS sequence generated by root sequence 2;

[0102] ◆Reuse the mapping relationship between the random access preamble code and the downlink beam to obtain the preamble code for unscheduled uplink transmission, and obtain the DMRS and multi-access signature resources for unscheduled uplink transmission through the mapping relationship between the preamble code for unscheduled uplink transmission and DMRS and multi-access signature resources.

[0103] For example, through the mapping relationship between the random access preamble code and the downlink beam, the available preamble code resources for unscheduled uplink transmission corresponding to the determined SSB are obtained, and a preamble code is selected. Through the corresponding mapping relationship between the preamble code and the DMRS (such as 1 to 1, N to 1, 1 to N, N to M, etc.), the available DMRS sequence or sequence set is obtained, and then the UE can determine the DMRS sequence used. If it is 1 to 1, the UE can determine the available DMRS sequence after determining the preamble code. If it is 1 to N, the UE determines the available DMRS sequence set after determining the preamble code, and the UE randomly selects a DMRS sequence from the set with medium probability; the method for determining the MAS is similar. In some embodiments, the preamble code can be mapped to the DMRS and then mapped to the MAS, or the preamble code can be mapped to the MAS and then mapped to the DMRS, or the preamble code can be mapped to the DMRS and the MAS respectively.

[0104] ◆ Reuse the mapping relationship between random access preambles and downlink beams to obtain the available preamble resources for grant-free uplink transmission corresponding to a determined SSB. However, for the mapping relationship between DMRS and / or multi-access signature resources and downlink beams, obtain the available DMRS and / or multi-access signature resources for grant-free uplink transmission corresponding to a determined SSB according to the separately configured mapping relationship between the preamble and / or DMRS and / or multi-access signature resources for grant-free uplink transmission and downlink beams as described above.

[0105] ◆ Combinations of the above methods.

[0106] For example, if the network configures a separate mapping relationship between the preamble and / or DMRS and / or multi-access signature resources for grant-free uplink transmission and downlink beams, then according to this mapping relationship, obtain the available preamble and / or DMRS and / or multi-access signature resources for grant-free uplink transmission corresponding to a determined SSB. If the network does not configure a separate mapping relationship between the preamble and / or DMRS and / or multi-access signature resources for grant-free uplink transmission and downlink beams, then the UE obtains the available preamble and / or DMRS and / or multi-access signature resources for grant-free uplink transmission corresponding to a determined SSB according to the mapping relationship between random access preambles and downlink beams, such as the method of mapping preambles to DMRS and / or MAS as described above.

[0107] (4) Resource pool of radio network temporary identifiers (GF-RNTI) for grant-free uplink transmission

[0108] The resource pool includes a set of M available RNTI values, and the UE can equally probably select one RNTI from the M as the GF-RNTI for grant-free uplink transmission.

[0109] (5) Mapping relationship between GF-RNTI and at least one of the time-frequency resources, grant-free preambles, DMRS, and multi-access signature resources for grant-free uplink transmission

[0110] Taking the time-frequency resources for grant-free uplink transmission as an example, establish the mapping relationship between the time-frequency resources for grant-free uplink transmission and GF-RNTI. For example, one GFO maps to one GF-RNTI value or a set of GF-RNTIs. The UE obtains the available GF-RNTI value or set (then the UE can equally probably randomly select one GF-RNTI from the set) through the determined time-frequency resources for grant-free uplink transmission. Other methods of using the mapping relationship between grant-free preambles / DMRS / multi-access signature resources and GF-RNTI are similar.

[0111] (6) Configuration of the control resource set and / or search space for the UE to search for grant-free uplink transmission feedback

[0112] From this configuration information, the UE can obtain at least one of the following control resource information for searching for grant-free uplink transmission feedback:

[0113] - The frequency-domain position (frequency-domain starting position, number of frequency-domain units). The frequency-domain starting position can be an absolute starting position (e.g., notified by an absolute frequency value), and / or a relative starting position, such as based on a reference point and then notifying a frequency-domain offset to find the frequency-domain starting position. The reference point can be a reference point of the entire frequency-domain carrier, and / or a reference point of a certain bandwidth part (BWP) in the carrier; the frequency-domain offset can be the number of frequency-domain units notified to be offset.

[0114] - The time-domain position (time-domain starting position, number of time units). The time-domain starting position can be an absolute starting position, such as notified by a specific system frame number (SFN) and / or subframe index in the system frame, and / or slot index, and / or OFDM symbol index, and / or a relative starting position, such as relative to a reference time position and then notifying an offset on the time unit. The reference time position can be the last OFDM symbol of the received system information-configured PDSCH / PDCCH / PBCH, or the last OFDM symbol of the slot where it is located; the offset on the time unit can be a first-level time unit offset, such as N slots, or a multi-level time unit offset, such as N1 slots and N2 OFDM symbols.

[0115] - The search period. Notify the UE how long to repeat the search and detection. The search period can be an absolute time such as 5 ms, 10 ms, 20 ms, 40 ms, etc.; or the number of time units, such as 1 slot, 1 subframe, etc.

[0116] - The maximum number of detections. Notify the number of PDCCH candidates that the UE needs to search for a corresponding aggregation level (AL) on a control resource for detecting grant-free uplink transmission feedback.

[0117] - In some embodiments, the configuration information may further notify the UE of the number of control resources available for detecting grant-free uplink transmission feedback in a search period, such as the number of control resource sets, and / or the number of search spaces; and / or notify the UE of the number of control resources that need to be searched for detecting grant-free uplink transmission feedback in a search period. When the total number of available control resources M_all in a search period is greater than the number of control resources M_need that the UE needs to search, i.e., M_all > M_need, the UE also needs to determine the positions of the M_need control resources to be searched, for example, the first M_need among M_all, or the last M_need, or the corresponding M_need indices in M_all explicitly indicated in the configuration information.

[0118] (7) The maximum number of transmissions N_max for grant-free uplink transmission

[0119] (8) The maximum transmission time T_time for grant-free uplink transmission

[0120] Return reference Figure 3 , the user receives the system broadcast message (including the master broadcast message, RMSI, and / or other system information OSI), or the downlink control channel information, or the high-layer control signaling information from the base station through the downlink channel; the user obtains the configuration information for grant-free uplink transmission; then the UE determines the GF-RNTI for grant-free uplink transmission according to certain rules, where the above certain rules may at least include one of the following:

[0121] ◆ The UE obtains the RNTI resource pool (i.e., the RNTI resource set) for the user's grant-free uplink transmission from the configuration information, and the UE equally probably selects an RNTI from the RNTI resource pool as its GF-RNTI for grant-free uplink transmission.

[0122] ◆ Determine the GF-RNTI for grant-free uplink transmission according to the mapping relationship between the GF-RNTI and at least one of the time-frequency resources, preambles, DMRS, and multi-access signature resources for grant-free uplink transmission in the configuration information.

[0123] Specifically, the UE obtains the mapping relationship between the GF-RNTI and the time-frequency resources / preambles / DMRS / multiple access signature resources for grant-free uplink transmission from the configuration information; and determines the corresponding GF-RNTI through the selected time-frequency resources / preambles / DMRS / multiple access signature resources for grant-free uplink transmission. Taking the time-frequency resources for grant-free uplink transmission as an example, using the mapping relationship between the time-frequency resources for grant-free uplink transmission and the GF-RNTI, such as a GF-RNTI value or a set of GF-RNTIs is mapped on a GFO, the UE obtains the available GF-RNTI value or set through the determined time-frequency resources for grant-free uplink transmission (then the UE can randomly select a GF-RNTI from this set with equal probability). The methods for other uses of the mapping relationship between preambles / DMRS / multiple access signature resources and the GF-RNTI are similar.

[0124] ◆ Based on the determined time-frequency resources for grant-free uplink transmission, and / or the selected time-frequency resources / preambles / DMRS / multiple access signature resources for grant-free uplink transmission, the UE calculates the GF-RNTI for grant-free uplink transmission. Among them, the calculation method is as follows, for example:

[0125] Calculate based on the GFO index where the determined time-frequency resources for grant-free uplink transmission are located, and / or the time unit index, such as the slot index where it is located, and / or the OFDM symbol index where it is located, and / or the subframe index, and / or the carrier index (the carrier index can refer to different carriers, or a supplementary uplink carrier or a non-supplementary uplink carrier), etc.; possible calculation methods are:

[0126] GF-RNTI = 1 + s_id + 14×t_id + 14×80×f_id + 14×80×8×ul_carrier_id; where s_id is the index of the first OFDM symbol where the GFO determined by the UE is located, t_id is the slot index in the system frame where the GFO determined by the UE is located; f_id is the index of the GFO determined by the UE in the frequency domain; ul_carrier_id is the carrier index determined by the UE used to send the grant-free uplink transmission.

[0127] ◆ When determining the time-frequency resources for grant-free uplink transmission based on the configured random access time-frequency resources, obtain the GF-RNTI by calculating the radio network temporary identifier RA-RNTI on the corresponding random access channel. For example, there is a mapping relationship between the random access channel and the time-frequency resources for grant-free uplink transmission, find the corresponding random access channel through the determined time-frequency resources for grant-free uplink transmission, and use the RA-RNTI calculated on the corresponding random access channel.

[0128] In addition, the UE can also determine the time-frequency resources and / or preambles and / or DMRSs and / or multi-access signatures for grant-free uplink transmission according to at least one of the following methods.

[0129] - The mapping relationship between the time-frequency resources for grant-free uplink transmission and / or the grant-free preambles and / or DMRSs and / or MAS resources and the downlink beam; and

[0130] - The mapping relationship between the GF-RNTI and the time-frequency resources / grant-free preambles / DMRSs / multi-access signature resources for grant-free uplink transmission.

[0131] The GF-RNTI determined by the above several methods can also be used for the user to generate the scrambling sequence c when preparing for grant-free uplink transmission.

[0132] For example, when the user prepares the single-stream or multi-stream coded bit sequences b(0),..., b(M-1) after channel coding of the information bit sequence, where M is the length of the coded bit sequence. Specifically, when the user is multi-stream transmitting, M can be the total length before splitting or the length of a single stream after splitting. This coded bit sequence needs to be scrambled before modulation to obtain the scrambled coded sequence s(0),..., s(M-1), where s(i) = [b(i) + c(i)] mod 2, and mod2 represents the modulo-2 operation; among them, the initial value c_init of the scrambling sequence c(0),..., c(M-1) is obtained by one of the following formulas:

[0133] ■ c_init = n_rnti * 2 15 + n_id;

[0134] ■

[0135] Among them, n_id can be the data scrambling identity configured by higher-layer signaling, or the network identity of the cell (cell id, N ID cell );Among them, n s is the time unit index, for example, representing the slot number in a system frame (slot index in a radio frame); q can be the codeword index (codeword index), such as when only one single codeword is transmitted, q = 0; in the present invention, for grant-free uplink transmission, n_rnti can be the GF-RNTI; and the method for determining the GF-RNTI has been described above by several methods and will not be elaborated here. The scrambling sequence c(0),..., c(M-1) can be generated by a Gold sequence with a length of 31, such as

[0136] c(n) = [x1(n + N c ) + x2(n + N c )] mod 2, and

[0137] x1(n + 31) = [x1(n + 3) + x1(n)] mod 2; and

[0138] x2(n + 31) = [x2(n + 3) + x2(n + 2) + x2(n + 1) + x2(n)] mod 2;

[0139] where N c is a fixed value, such as N c = 1600; x1 and x2 respectively represent two M-sequences of length 31; and x1(n) is initialized as x1(0) = 1, x1(n) = 0, n = 1, 2,..., 30; while x2(n) is initialized as the above-generated c_init, such as which means converting c_init into a binary number, and then the data on each i-th bit is the value of x2(i).

[0140] The above is an example of generating a scrambling sequence, not the only way;

[0141] When the UE starts the initialization settings for unscheduled uplink transmission, if the configuration information received by the UE includes the maximum number of transmissions N_max for unscheduled uplink transmission and / or the maximum transmission time T_time for unscheduled uplink transmission; if this is the first transmission of the data by the UE, i.e., the initial transmission, the UE sets the transmission count counter GF_transmission_counter to 1, and / or starts the transmission timer GF_transmission_timer after the first transmission.

[0142] The UE performs unscheduled uplink transmission. The data to be uploaded may include a user identifier for conflict resolution. The user identifier can be one or more of the following:

[0143] · Temporary Mobile Subscriber Identity S-TMSI;

[0144] · C-RNTI (for users who have obtained a valid C-RNTI);

[0145] · Fixed random number, such as an N-bit (N is a positive integer, for example, a 40-bit) random number;

[0146] Reference Figure 3The base station detects the uplink signal transmission from the user on the time-frequency resources configured for grant-free uplink transmission. Downlink feedback is performed on the successfully detected and decoded uplink signal, and the GF-RNTI corresponding to the determined successfully detected and decoded signal is used in the downlink feedback. If it is fed back to the user using the downlink control channel, the GF-RNTI is used for scrambling in the cyclic redundancy check (CRC) of the downlink control channel; in the downlink feedback, one or more of the following may be included:

[0147] · Uplink transmission grant for new data;

[0148] · Uplink grant for data retransmission;

[0149] · An identifier, such as ACK, indicating that the previous uplink transmission was successful or that data retransmission is not required;

[0150] · Conflict resolution identifier, which may be the user identifier included by the UE for conflict resolution in grant-free uplink transmission;

[0151] · Temporary C-RNTI value; and

[0152] · Timing advance information.

[0153] Continue to refer to Figure 3 The UE detects possible feedback from the base station on the time-frequency resources obtained from the control resource set and / or search space configuration determined for searching for grant-free uplink transmission feedback using the previously determined GF-RNTI for grant-free uplink transmission. If the GF-RNTI is used to descramble the CRC of the detected PDCCH, and the descrambled CRC is successful, it indicates that the UE has obtained the correct PDCCH. The feedback from the base station to the UE can be directly in the PDCCH or in the PDSCH specified by the downlink scheduling in the PDCCH.

[0154] In the feedback detected by the UE:

[0155] · When the conflict resolution identifier included matches the user identifier included by the UE for conflict resolution in the previous grant-free uplink transmission, the UE considers this feedback to be the correct feedback that matches itself;

[0156] · When the uplink transmission grant for new data is included, the UE sends new data according to the uplink transmission grant for new data;

[0157] · When the uplink grant for data retransmission is included, the UE performs a retransmission of the data according to the uplink transmission grant for the retransmission of the previous data;

[0158] · When a kind of identifier (such as ACK) is included, indicating that the previous uplink transmission has been successful or data retransmission is not required, the UE considers that the previous transmission is completed and no retransmission or new transmission is required;

[0159] · When a temporary C-RNTI value is included, if the UE does not have a C-RNTI before, it sets this temporary C-RNTI value as its own C-RNTI value; if the UE has a C-RNTI value before, it clears the previous C-RNTI and sets this temporary C-RNTI value as its own C-RNTI value.

[0160] · When timing advance information is included, if the UE receives feedback from the base station at time N, the UE uses the indicated timing advance information for uplink transmission within the time unit after N + k; this uplink transmission includes subsequent grant-free transmissions or grant-based transmissions;

[0161] In some embodiments, when the UE does not detect the correct feedback (such as not detecting the correct PDCCH) or the detected feedback does not match the user identifier included for conflict resolution in the previous grant-free uplink transmission, the UE can perform the following actions:

[0162] · If the transmission timer GF_transmission_timer does not time out, and / or the transmission count counter GF_transmission_counter is incremented by 1, and the value of the transmission count counter after the increment does not exceed the maximum number of transmissions N_max for the grant-free uplink transmission, that is, GF_transmission_counter + 1 ≤ N_max, the UE re-performs the grant-free uplink transmission; or

[0163] · If the transmission timer GF_transmission_timer times out, and / or the transmission count counter GF_transmission_counter is incremented by 1, and the value of the transmission count counter after the increment exceeds the maximum number of transmissions N_max for the grant-free uplink transmission, that is, GF_transmission_counter + 1 > N_max, the UE stops performing the grant-free uplink transmission and reports the grant-free uplink transmission problem to the upper layer.

[0164] Specifically, in another embodiment of the present disclosure, a method for completing two-step random access transmission by using the grant-free uplink transmission proposed in the present disclosure will be introduced. In this embodiment, the grant-free uplink transmission can be regarded as two cases:

[0165] 1. If the grant-free uplink transmission includes a random access preamble transmission and an uplink data transmission, specifically, the time-frequency resource location of the random access preamble transmission in the grant-free uplink transmission time-frequency resource is called the two-step random access preamble time-frequency resource, and the time-frequency resource location of the uplink data transmission is called the two-step random access uplink data time-frequency resource; at this time, if the system configures random access time-frequency resources, then the random access time-frequency resources can be expressed as four-step random access time-frequency resources; then the method introduced in the above embodiments can be used to

[0166] a) Determine the resources of the grant-free uplink transmission (including the random access resources of the preamble in the grant-free uplink transmission and the resources of the data part in the grant-free uplink transmission) by the relative relationship between the configured four-step random access resources and the grant-free uplink transmission; for example, in the resources of the grant-free uplink transmission, the time-frequency resource where the preamble is located starts from the first time unit, and the relationship between the resources of the data part and the preamble is pre-fixed or configured, such as Figure 9 shown, taking only time units as an example, the time intervals T1 and / or T2 can be pre-defined or configured by the network side; the method using the relative relationship of time and / or frequency domain is similar, or

[0167] b) Determine the resources of the preamble in the grant-free uplink transmission by the relative relationship between the configured four-step random access resources (time-frequency resources and / or preamble resources)

[0168] and the random access resources (time-frequency resources and

[0169] / or preamble resources) of the preamble in the grant-free uplink transmission; then determine the resources of the data part in the grant-free uplink transmission by the relative relationship between the resources of the preamble in the grant-free uplink transmission and the resources of the data part (time-frequency resources and / or DMRS resources) in the grant-free uplink transmission.

[0170] 2. If the grant-free uplink transmission only includes an uplink data transmission (i.e., does not include a preamble transmission), the time-frequency resource location of the uplink data transmission is called the two-step random access uplink data time-frequency resource; at this time, if the system configures random access time-frequency resources, then the random access time-frequency resources can be expressed as two-step random access time-frequency resources; then the method introduced in the above embodiments can be used to determine the resources of the grant-free uplink transmission (i.e., the resources of the data part in the grant-free uplink transmission) by the configured two-step random access resources and the relative relationship between the pre-defined or configured two-step random access resources and the grant-free uplink transmission; such as Figure 10 shown, taking only time units as an example, the time interval T3 can be pre-defined or configured by the network side.

[0171] Specifically, the time intervals (i.e., time-domain relative relationships) in the above description can also be replaced by combining time-domain relative position relationships and / or frequency-domain relative relationships; the method is similar and will not be elaborated here.

[0172] In this embodiment, the base station sends configuration information for the transmission and reception of the uplink signal used in the present disclosure (referred to as the two-step random access 2step RACH process in this embodiment) to the user through the downlink channel (such as the downlink control channel PDCCH, the downlink shared channel PDSCH, the downlink broadcast channel PBCH) in system information, downlink control information, high-layer control information (such as RRC configuration messages), and handover command messages; the UE receives the configuration message, where the configuration information for the two-step random access includes at least one of the following: 1. Random access resource configuration (including random access time-frequency resources and / or preamble resources)

[0173] a) When the two-step random access time-frequency resources share the four-step random access time-frequency resources (for example, the network side predefines (defaults) or notifies the UE through SI, DCI, RRC messages that the two-step random access time-frequency resources share the four-step random access time-frequency resources), then

[0174] i. For the configuration of the two-step random access time-frequency resources, reuse the four-step random access time-frequency resource configuration, that is, according to the starting position of the four-step random access time-frequency resources configured by the network side, and / or the number of four-step random access time-frequency resources, and / or the period of the four-step random access time-frequency resources, and / or the mapping relationship between the four-step random access time-frequency resources and the downlink signal (SSB and / or CSI-RS), etc., the UE can find the available two-step random access time-frequency resources;

[0175] ■ Specifically, the two-step random access time-frequency resources partially share the four-step random access time-frequency resources; it includes at least one of the following partial sharing methods:

[0176] A. Partial time-domain sharing; that is, the network configures the starting position and / or number of the two-step random access time-frequency resources in the time domain of the four-step random access time-frequency resources; the UE obtains the two-step random access time-frequency resources by receiving the configuration information, and the configuration information can directly indicate the index of the starting RO and / or the number of ROs by N bits; or in a relative relationship manner, for example, indicating that the ROs after the Xth RO are the two-step random access time-frequency resources; for example, Figure 11In the time domain, there are 4 ROs in the time-frequency resources of four-step random access, denoted as RO 0 to 3; if the time-domain starting position of the two-step random access time-frequency resources is RO 2 and the number is 2, it means that the two-step random access time-frequency resources are the random access time-frequency resources at the last two RO positions in the time domain;

[0177] B. Partial frequency domain sharing; that is, the network configures the starting position and / or number of the two-step random access time-frequency resources in the frequency domain of the four-step random access time-frequency resources; the UE obtains the two-step random access time-frequency resources by receiving this configuration information, and this configuration information can directly indicate the index of the starting RO and / or the number of ROs through N bits; or in a relative relationship manner, for example, it indicates that the ROs after the Y-th RO are the two-step random access time-frequency resources; for example, Figure 12 In the frequency domain, there are 4 ROs in the four-step random access time-frequency resources, denoted as RO 0 to 3; if the time-domain starting position of the two-step random access time-frequency resources is RO 2 and the number is 2, it means that the two-step random access time-frequency resources are the random access time-frequency resources at the last two RO positions in the frequency domain;

[0178] C. Partial time-frequency domain sharing; that is, the network configures the starting position and / or number of the two-step random access time-frequency resources in the time domain and frequency domain of the four-step random access time-frequency resources; the UE obtains the two-step random access time-frequency resources by receiving this configuration information, and this configuration information can directly indicate the index of the starting RO and / or the number of ROs through N bits; or in a relative relationship manner, for example, it indicates that the ROs after the X / Y-th RO are the two-step random access time-frequency resources; for example, Figure 13 In the time domain and frequency domain, there are 4 ROs in the four-step random access time-frequency resources, denoted as RO_T 0 to 3 and RO_F 0 to 3; if the time-domain starting position of the two-step random access time-frequency resources is RO_T = 1, the number is 2 and RO_F = 3, the number is 1, it means that the two-step random access time-frequency resources are the second and third in the time domain; the last RO position in the frequency domain of the random access time-frequency resources;

[0179] ii. For the configuration of the two-step random access preamble resources, the UE needs to determine:

[0180] ■ The available starting index of the two-step random access preamble; the determination method can be at least one of the following:

[0181] A. The UE determines it through the default (preset) preamble index starting position, such as starting from the random access preamble index 0 or defaulting to the same as the determined four-step random access preamble index;

[0182] B. The UE determines it through the preamble index starting position configured by the network side, such as through PreambleFor2stepRACHStart;

[0183] C. The UE calculates the starting point of the four-step random access preamble solicitation. If the starting point of the four-step random access preamble solicitation determined by the UE is denoted as PreambleFor4stepRACHStart (for example, for a selected SSB index, the starting position of the mapped preamble is determined), and the number of available determined four-step random access preamble indexes is X (for example, for a selected SSB index, the number of mapped preambles is determined), then PreambleFor2stepRACHStart = PreambleFor4stepRACHStart + X; Specifically, the network configuration information can directly indicate that N four-step random access preambles are two-step random access preambles, and these N preambles can be predefined as the N preambles with the smallest (largest) index values among the four-step random access preambles;

[0184] ■ The number of available two-step random access preambles; The determination method can be at least one of the following:

[0185] A. The UE determines it through the default (pre-set) number of preambles. For example, the number of available preambles pre-set by the system is N, or it is defaulted to be the same as the number of four-step random access preambles;

[0186] B. The UE determines it through the number of preambles configured by the network side, such as through numberOfPreambleFor2stepRACH; Specifically, this value can be specifically indicated as the number of preambles in set A, for example

[0187] numberOfRA-PreamblesFor2stepRAGroupA INTEGER(1..64)

[0188] Wherein, when the data size in the user's message A is less than (not greater than) a preset or configured threshold S1, and / or the downlink PL (and / or RSRP) measured by the user is less than (not greater than) a preset or configured threshold S2, the UE selects a preamble from set A; when the data size in the user's message A is not less than (greater than) a preset or configured threshold S1, and / or the downlink PL (and / or RSRP) measured by the user is not less than (greater than) a preset or configured threshold S2, the UE selects a preamble from set B; at this time, the number of preambles in set B is the total number of available preambles minus the number of available preambles in set A; and the starting position of the preambles in set B can be the starting position of set A plus the number of available preambles in set A; specifically, the network configuration information can directly indicate that N four-step random access preambles are two-step random access preambles, and these N preambles can be predefined as the N preambles with the smallest (largest) preamble index values in the four-step random access (all, or set A, or set B).

[0189] C. The UE calculates based on the number of four-step random access preambles. If the starting point of the four-step random access preamble index determined by the UE is represented as numberOfRA-PreamblesFor4stepRACH (for example, for a selected SSB index, the number of its mapped preambles is determined), and then it is determined based on a preset or configured relative relationship, such as a multiple relationship BETA (i.e., numberOfRA-PreamblesFor2stepRACH = numberOfRA-PreamblesFor4stepRACH * BETA), or a difference relationship D (i.e., numberOfRA-PreamblesFor2stepRACH = numberOfRA-PreamblesFor4stepRACH + D); specifically, this method of determining preambles can be applied separately to determine the number of preambles in set A or B

[0190] b) When the two-step random access time-frequency resource does not share the four-step random access time-frequency resource (for example, the network predefines (by default) or notifies the UE through SI, DCI, RRC messages that the two-step random access time-frequency resource does not share the four-step random access time-frequency resource), that is, the UE is notified separately through the two-step random access time-frequency resource, then

[0191] i. For the configuration of the two-step random access time-frequency resource, the determination method of the UE is as follows:

[0192] ■ Completely separate notification. For example, the UE obtains the configuration of the two-step random access time-frequency resource by reading the information indicated by 2step RACH-ConfigCommon, and the information indicated at least includes one of the following:

[0193] A. The number of SSBs on each RO and / or the number of preambles corresponding to each SSB, ssb-perRACH-OccasionAndCB-PreamblesPerSSB;

[0194] B. The random access configuration index, prach-ConfigurationIndex, which indicates the configuration of the two-step random access time-frequency resources in the time dimension, including: the two-step random access configuration period (i.e., the time unit at a certain point where the configured two-step random access time-frequency resources periodically repeat); the occupied time length in each period (e.g., 10 ms) and the position X_2step of this time length (e.g., when the period is 40 ms, the time length of the random access time-frequency resources is 10 ms, which is the X_2step-th 10 ms in 40 ms, e.g., X_2step = 2, X_2step mod(4) = 2, representing the second 10 ms); the number and position of ROs configured within the occupied time length;

[0195] C. The number of ROs in the frequency domain on the same time unit;

[0196] D. The starting position of the RO in the frequency domain.

[0197] ■ Notify the (time and / or frequency domain) relative relationship configuration information of the two-step random access time-frequency resources relative to the four-step random access time-frequency resources, that is, the UE obtains the configuration information of the two-step random access time-frequency resources through the configured four-step random access time-frequency resource information and the (time and / or frequency domain) relative relationship configuration information of the two-step random access time-frequency resources relative to the four-step random access time-frequency resources; among them, the (time and / or frequency domain) relative relationship configuration information of the two-step random access time-frequency resources relative to the four-step random access time-frequency resources includes at least one of the following:

[0198] A. The indication of the time domain relative position information, including at least one of the following:

[0199] I) The relative relationship beta of the two-step random access configuration period 2stepRACH_period to the four-step random access configuration period 4stepRACH_period, which means 2stepRACH_period = beta * 4stepRACH_period. For example, 4stepRACH_period = 20 ms, beta = 2, and 2stepRACH_period is 40 ms; specifically, the relative relationship beta can also be preset by the system;

[0200] II) The offset X_delta in time units of the location X_2step of the time length (e.g., 10 ms) occupied by the two-step random access time-frequency resource within each random access configuration period relative to the location X_4step of the time length (e.g., 10 ms) occupied by the four-step random access time-frequency resource, then X_2step = X_4step + X_delta. For example, if the random access configuration period is 40 ms, X_delta = 1, and X_4step = 1, it means that the time length occupied by the four-step random access time-frequency resource is in the first 10 ms within 40 ms, and the time length occupied by the two-step random access time-frequency resource is in the next 10 ms relative to the time length occupied by the four-step random access time-frequency resource, that is, in the second 10 ms within 40 ms;

[0201] As Figure 14 shown in the example, if the random access configuration period is 20 ms, the time length occupied by the four-step random access time-frequency resource is in the first 10 ms of a random access configuration period, and X_delta = 1, then the time length occupied by the two-step random access time-frequency resource is in the second 10 ms of the first 10 ms of a random access configuration period, and the number and location of ROs within the time length occupied by the two-step random access time-frequency resource are the same as those within the time length occupied by the two-step random access time-frequency resource;

[0202] III) The number, and / or location, and / or period of the two-step random access time-frequency resource in the time domain are predefined or network-configured to be the same as those of the four-step random access time-frequency resource in the time domain;

[0203] B. Frequency domain relative position information indication, including at least one of the following (if it indicates that the starting position of the first RO in the frequency domain of the four-step random access resource on the same time unit is FDMed_RO_start_4step and /

[0204] or the number of ROs in the frequency domain on the same time unit is N_FDMed_RO_4step):

[0205] I) The interval size between the starting position of the first RO in the frequency domain of the two-step random access time-frequency resource (e.g., the first subcarrier on this RO) and the ending position of the last RO in the frequency domain of the four-step random access time-frequency resource (e.g., the last subcarrier on this RO), that is, N frequency domain units; As Figure 15 shown, if the UE receives an indicated interval size of 4 frequency domain units, then the first frequency domain unit after 4 frequency domain units starting from the ending position of the last RO in the four-step random access time-frequency resource is determined as the starting position of the first RO in the frequency domain of the two-step random access time-frequency resource;

[0206] II) For the number of ROs in the frequency domain of the time-frequency resources for two-step random access, it can be directly indicated by N bits, or the number of ROs in the frequency domain of the time-frequency resources for four-step random access is pre-defined for reuse (i.e., the same as the number of ROs in the frequency domain of the time-frequency resources for four-step random access), or the relative relationship (such as the ratio) with the number of ROs in the frequency domain of the time-frequency resources for four-step random access is configured.

[0207] C. Mapping relationship with the downlink beam; The mapping rules and corresponding parameter settings between the time-frequency resources for four-step random access and the downlink beam can be reused;

[0208] ii. For the configuration of the two-step random access preamble resources,

[0209] c) The format of the two-step random access preamble, and the determination method can be at least one of the following:

[0210] i. Separate network-side configuration, for example, the format of the preamble for two-step random access is indicated by preambleFormat_2step. For example, 4 possible preamble format configurations (including cyclic prefix length, and / or sequence length, and / or subcarrier spacing, and / or restricted set) are notified by 2 bits. Specifically, the possible preamble configurations can be in the form of a pre-set table;

[0211] ■ Specifically, the UE does not expect to receive a two-step random access preamble configuration different from the size of the time-frequency resources occupied by the four-step random access preamble (i.e., the size corresponding to one RO); for example, if the RO corresponding to the four-step random access preamble occupies 2 OFDM symbols (such as A1 configured as a short sequence), the UE expects to receive a two-step random access preamble that also occupies 2 OFDM symbols (such as A1 and / B1);

[0212] ii. Determined by the configured four-step random access preamble format; that is, the network configures the four-step random access preamble format, and the UE sets the format of the two-step random access preamble according to the four-step random access preamble format;

[0213] d) Other random access resource configuration information, including at least one of the following:

[0214] i. Two-step random access target reception power;

[0215] ii. Two-step random access maximum retransmission times;

[0216] iii. Fallback to four-step random access indication; If it is enabled, under certain conditions, the UE falls back to perform four-step random access;

[0217] iv. Two-step random access resource use indication, if activated (enable), when the UE is configured with four-step or two-step random access resources at the same time, the UE shall give priority to two-step random access;

[0218] 2. Data part (PUSCH and / or DMRS) resource configuration, including at least one of the following:

[0219] a) Time domain location configuration of PUSCH time-frequency resources:

[0220] i. The time domain interval between the PUSCH time-frequency resources configured by the network device and the corresponding two-step random access time-frequency resources, that is, N time units; and / or the time length occupied by the PUSCH time-frequency resources configured by the network device, that is, M1 time units or M1 two-step random access PUSCH resource units (the definition of the resource unit is similar to the definition of GFO in the aforementioned embodiment, that is, the time-frequency resource size for sending a data part of a specific size is composed of predefined X time units and Y frequency domain units); then 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 within the time range where the selected two-step random access time-frequency resource is located is the time domain starting 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 of the selected RO in the time domain, or the RO index, where delta is a predefined or configured additional time unit interval in order to minimize inter-symbol interference. Wherein, the time range of the selected two-step random access time-frequency resource can be at least one of the following:

[0221] ■ Directly select the two-step random access time-frequency resource (i.e. the selected RO);

[0222] ■The random access configuration period where the selected two-step random access time-frequency resource is located or the last RO in the time domain;

[0223] ■ A complete 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 in the time domain

[0224] ■ 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 in the time domain

[0225] ■ 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 in the time domain

[0226] b) Configuration of the frequency domain position of the time-frequency resource of the PUSCH:

[0227] i. Predefine or configure the starting position in the frequency domain. For example, N frequency domain units after a frequency domain position is the starting position of the two-step random access PUSCH in the frequency domain and / or M2 frequency domain units (or resource units of the two-step random access PUSCH);

[0228] Among them, the aforementioned one frequency domain position can be:

[0229] ■ Bandwidth part (bwp); carrier, etc.

[0230] ■ The starting position in the frequency domain of the selected two-step random access RO;

[0231] Then the UE can determine that the starting position of the two-step random access PUSCH corresponding to the selected RO can be the first frequency domain unit after N (or N + x_id * M2; or N + x_id * M2 * Y; or N + x_id * M2 + delta; N + x_id * M2 * Y + delta) frequency domain units; where x_id is the frequency domain index of the selected RO, or RO index; or the selected preamble index (the preamble index on the entire RO or the preamble index available for two-step random access, for example, the preamble index on the entire RO is 0 to 63, and the preambles available for two-step random access are 54 to 63 among them, then x_id here can be 0 to 9); specifically, N can be 0; where delta can represent a guard carrier, used to avoid inter-carrier interference as much as possible;

[0232] c) Specifically, the starting and ending positions in the frequency domain of the two-step random access time-frequency resource and its corresponding two-step random access PUSCH resource are the same;

[0233] d) If there is only one available DMRS resource on a two-step random access PUSCH, map and select the PUSCH in ascending order of the preamble index; in the way of frequency domain priority or time domain priority; among them, M1 * M2 needs to ensure that there are enough two-step random access PUSCH resources for the possible preambles on the corresponding two-step random access time-frequency resource;

[0234] e) If there is more than one (e.g., W, e.g., W = 12) available DMRS resource on a two-step random access PUSCH, they are mapped in ascending order of the selected preamble index, then in ascending order of the DMRS resource index, and then in ascending order of the available two-step random access PUSCH resources (or mapped in ascending order of the available two-step random access PUSCH resources and then in ascending order of the DMRS resource index); if there are 24 preambles for two-step random access on an RO, and now there are 2 PUSCHs, with 12 available DMRSs for each PUSCH, then for the user who has selected preambles from 0 to 11, the first PUSCH is determined, and the DMRSs are selected in sequence from 0 to 11 on the first PUSCH; for the user who has selected preambles from 12 to 23, the second PUSCH is determined, and the DMRSs are selected in sequence from 0 to 11 on the second PUSCH; where the ascending order of available PUSCH resources can be time-domain priority or frequency-domain priority; where the DMRS resource index can be represented as different (DMRS resource position, RE mapping pattern, sequence index, cyclic shift value, frequency-domain OCC, time-domain OCC, or comb pattern, etc.)

[0235] f) The subcarrier spacing or waveform configuration of the PUSCH for two-step random access is determined according to the subcarrier spacing or waveform configuration in the uplink BWP configuration;

[0236] 3. The control resource set and / or search space for search feedback can be configured separately, or predefined to have the same configuration as the control resource set and / or search space for search feedback (or RMSI) for four-step random access.

[0237] After the UE obtains the two-step random access resource configuration information, the UE can perform at least one of the following operations:

[0238] 1. When the time-frequency resources for two-step random access share the same time-frequency resources as those for four-step random access, the available two-step random access time-frequency resources (i.e., RO) are found according to the selected downlink beam and mapping relationship, then a preamble is selected from the set of available two-step random access preambles, and then the corresponding two-step random access PUSCH (including possible DMRS) is determined through the two-step random access PUSCH configuration information;

[0239] 2. When the time-frequency resources for two-step random access do not share the same time-frequency resources as those for four-step random access,

[0240] ■ If the time-frequency resources for two-step random access are configured separately, find the available time-frequency resources for two-step random access (i.e., RO) according to the selected downlink beam and mapping relationship, then select a preamble from the available set of two-step random access preambles, and then determine the corresponding two-step random access PUSCH (including possible DMRS) through the two-step random access PUSCH configuration information;

[0241] ■ If the time-frequency resources for two-step random access are configured relative to the time-frequency resources for four-step random access, find the available time-frequency resources for four-step random access (i.e., RO) according to the selected downlink beam and mapping relationship, and then select the available time-frequency resources for two-step random access (i.e., RO) through the configuration information; then select a preamble from the set of two-step random access preambles, and then determine the corresponding two-step random access PUSCH (including possible DMRS) through the two-step random access PUSCH configuration information.

[0242] After determining the resources, the UE prepares the preamble to be sent and the message content, coding method, etc. included in the PUSCH; after determining the transmission power after power control, send message A (preamble and / or PUSCH);

[0243] The UE searches for possible feedback information on the determined control resource set and / or search space for search and feedback, and performs subsequent operations;

[0244] If the UE does not detect the correct feedback (or there is no feedback), the UE increments a preamble transmission counter and proceeds to the next transmission; or when the preamble transmission counter exceeds the maximum value, report a random access problem, or fallback to four-step random access transmission.

[0245] This embodiment also provides a user equipment 700 for unscheduled uplink transmission. The user equipment includes a memory 701 and a processor 702. The memory stores computer-executable instructions, and when the instructions are executed by the processor, at least one method corresponding to the above embodiments of the present disclosure is executed.

[0246] Specifically, for example, the processor can be configured to determine a radio network temporary identity GF-RNTI for unscheduled uplink transmission and other configurations to send an uplink signal according to the configuration information received from the base station for unscheduled uplink transmission; and search for feedback from the base station in the downlink control channel using the determined GF-RNTI and perform further operations according to the content of the feedback.

[0247] This embodiment also provides a base station device 800 for unscheduled uplink transmission. The base station device includes a memory 801 and a processor 802. Computer-executable instructions are stored on the memory. When the instructions are executed by the processor, at least one method corresponding to the above embodiments of the present disclosure is executed.

[0248] Specifically, for example, the processor may be configured to send configuration information for determining a wireless network temporary identifier GF-RNTI for unscheduled uplink transmission to the user equipment side; and detect the signal transmission of the user on the configured unscheduled uplink transmission time-frequency resource, and perform downlink feedback on the successfully detected and decoded signal transmission, and use the GF-RNTI corresponding to the successfully detected and decoded signal transmission in the downlink feedback.

[0249] The configuration information may include at least one of the following: a set of unscheduled uplink transmission time-frequency resources; a mapping relationship between the unscheduled uplink transmission time-frequency resource and the downlink beam; a mapping relationship between at least one of the unscheduled preamble, DMRS, and multi-access signature resource and the downlink beam; a resource pool of GF-RNTI; a mapping relationship between GF-RNTI and at least one of the unscheduled uplink transmission time-frequency resource, unscheduled preamble, DMRS, and multi-access signature resource; a configuration of a control resource set and / or search space for the UE to search for unscheduled uplink transmission feedback; the maximum number of transmissions for unscheduled uplink transmission; and the maximum transmission time for unscheduled uplink transmission.

[0250] The configuration information may also be used to determine at least one of the unscheduled uplink transmission time-frequency resource, unscheduled preamble, demodulation reference signal DMRS, and multi-access signature MAS.

[0251] The present disclosure also provides a computer-readable medium, on which computer-executable instructions are stored. When the instructions are executed, any method described in the embodiments of the present disclosure is executed.

[0252] Specifically, for example, the processor may be configured to send configuration information (the configuration information is the same as described above and will not be elaborated here) to the user equipment side; and detect the signal transmission of the user on the configured unscheduled uplink transmission time-frequency resource, and perform downlink feedback on the successfully detected and decoded signal transmission, and use the GF-RNTI corresponding to the successfully detected and decoded signal transmission in the downlink feedback.

[0253] The "user equipment" or "UE" herein may refer to any terminal having 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 having wireless communication capabilities, or Internet facilities that allow wireless Internet access and browsing, etc.

[0254] As used herein, the term "base station" (BS) may refer to an eNB, eNodeB, NodeB, or base transceiver station (BTS) or gNB, etc., depending on the technology and terminology used.

[0255] The "memory" herein 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 storage devices, magnetic storage devices and systems, optical storage devices and systems, fixed memories, and removable memories.

[0256] The processor herein can be of any type suitable for the technical environment of this article, including but not limited to one or more of the following: general-purpose computers, special-purpose computers, microprocessors, digital signal processors (DSPs), and processors based on multi-core processor architectures.

[0257] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

[0258] Those skilled in the art of this technology can understand that the present invention includes devices for performing one or more of the operations described in this application. These devices can be specifically designed and manufactured for the required purposes or can also include known devices in general-purpose computers. These devices have computer programs stored therein, and these computer programs are selectively activated or reconfigured. Such computer programs can be stored in a device (e.g., a computer) readable medium or in any type of medium suitable for storing electronic instructions and coupled to the bus respectively. The computer readable medium includes but is not limited to any type of disk (including floppy disks, hard disks, optical disks, CD-ROMs, and magneto-optical disks), ROM (Read-Only Memory), RAM (Random Access Memory), EPROM (Erasable Programmable Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), flash memory, magnetic cards, or optical cards. That is, the readable medium includes any medium that stores or transmits information in a form readable by a device (e.g., a computer).

[0259] Those skilled in the art can understand that each block in these structure diagrams and / or block diagrams and / or flowcharts, as well as combinations of blocks in these structure diagrams and / or block diagrams and / or flowcharts, can be implemented using computer program instructions. Those skilled in the art can understand that these computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing methods to implement, so that the solutions specified in the blocks or multiple blocks of the structure diagrams and / or block diagrams and / or flowcharts disclosed by the present invention are executed by the processor of the computer or other programmable data processing methods.

[0260] Those skilled in the art can understand that the various operations, methods, steps, measures, and solutions in the processes discussed in the present invention can be alternated, changed, combined, or deleted. Further, other steps, measures, and solutions in the various operations, methods, and processes discussed in the present invention can also be alternated, changed, rearranged, decomposed, combined, or deleted. Further, those in the prior art having steps, measures, and solutions in the various operations, methods, and processes disclosed in the present invention can also be alternated, changed, rearranged, decomposed, combined, or deleted.

[0261] The above are only partial embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A method for a two-step random access procedure in wireless communication executed by a terminal, comprising: Receiving a message from a base station, the message including information on whether a physical random access channel (PRACH) opportunity of a four-step random access type is shared with the two-step random access type; In the case where the PRACH opportunity of the four-step random access type is shared with the two-step random access type, sending a message A to the base station, the message A including a preamble based on a first configuration of the PRACH opportunity, wherein the first configuration of the PRACH opportunity is common to the four-step random access type and the two-step random access type; In the case where the PRACH opportunity of the four-step random access type is not shared with the two-step random access type, sending a message A to the base station, the message A including a preamble based on a second configuration of the PRACH opportunity, wherein the second configuration of the PRACH opportunity is configured separately for the two-step random access type.

2. The method according to claim 1, wherein, In the case where the PRACH opportunity of the four-step random access type is shared with the two-step random access type, the preamble index of the preamble associated with the synchronization signal block (SSB) starts from the following index: the index is determined according to the starting point of the preamble index of the preamble assigned to the four-step random access type associated with the SSB and the total number of preambles for the four-step random access type.

3. The method according to claim 1, further comprising: Receiving the first configuration of the PRACH opportunity from the base station.

4. The method according to claim 1, wherein the message further includes information indicating a subset of the PRACH opportunities of the four-step random access type shared with the two-step random access type.

5. The method according to claim 4, wherein, The subset is a subset of the PRACH opportunities of the four-step random access type shared with the two-step random access type that are associated with the same SSB, and the subset is in the complete mapping circle from the SSB to the random access opportunity.

6. A method for a two-step random access procedure in wireless communication executed by a base station, comprising: Sending a message to a terminal, the message including information on whether a physical random access channel (PRACH) opportunity of a four-step random access type is shared with the two-step random access type; In the case where the PRACH opportunity of the four-step random access type is shared with the two-step random access type, receiving a message A from the terminal, the message A including a preamble based on a first configuration of the PRACH opportunity, wherein the first configuration of the PRACH opportunity is common to the four-step random access type and the two-step random access type; In the case where the PRACH opportunity of the four-step random access type is not shared with the two-step random access type, receiving a message A from the terminal, the message A including a preamble based on a second configuration of the PRACH opportunity, wherein the second configuration of the PRACH opportunity is configured separately for the two-step random access type.

7. The method according to claim 6, wherein, In the case where the PRACH opportunities of the four-step random access type are shared with the two-step random access type, the preamble index of the preamble associated with the synchronization signal block SSB starts from the following index: This index is determined according to the starting point of the preamble index of the preamble assigned to the four-step random access type associated with the SSB and the total number of preambles for the four-step random access type.

8. The method according to claim 6, further comprising: Sending a first configuration of the PRACH opportunity to the terminal.

9. The method according to claim 6, wherein the message further comprises information indicating a subset of the PRACH opportunities of the four-step random access type shared with the two-step random access type.

10. The method according to claim 9, wherein, The subset is a subset of the PRACH opportunities of the four-step random access type shared with the two-step random access type that are associated with the same SSB, and the subset is in the complete mapping circle from the SSB to the random access opportunity.

11. A terminal for a two-step random access procedure in wireless communication, comprising: A transceiver; And A controller, coupled to the transceiver and configured to: Receive a message from the base station, the message including information on whether the physical random access channel PRACH opportunities of the four-step random access type are shared with the two-step random access type; In the case where the PRACH opportunities of the four-step random access type are shared with the two-step random access type, send a message A to the base station, the message A including a preamble based on a first configuration of the PRACH opportunity, wherein the first configuration of the PRACH opportunity is common to the four-step random access type and the two-step random access type; In the case where the PRACH opportunities of the four-step random access type are not shared with the two-step random access type, send a message A to the base station, the message A including a preamble based on a second configuration of the PRACH opportunity, wherein the second configuration of the PRACH opportunity is configured separately for the two-step random access type.

12. The terminal according to claim 11, wherein, In the case where the PRACH opportunities of the four-step random access type are shared with the two-step random access type, the preamble index of the preamble associated with the synchronization signal block SSB starts from the following index: This index is determined according to the starting point of the preamble index of the preamble assigned to the four-step random access type associated with the SSB and the total number of preambles for the four-step random access type.

13. The terminal according to claim 11, further comprising: Receiving the first configuration of the PRACH opportunity from the base station.

14. The terminal according to claim 11, wherein the message further comprises information indicating a subset of the PRACH opportunities of the four-step random access type shared with the two-step random access type.

15. The terminal according to claim 14, wherein, The subset is a subset of the PRACH opportunities of the four-step random access type shared with the two-step random access type that are associated with the same SSB, and the subset is in the complete mapping circle from the SSB to the random access opportunity.

16. A base station for a two-step random access procedure in wireless communication, comprising: A transceiver; And A controller, coupled to a transceiver and configured to: Send a message to a terminal, the message including information on whether a Physical Random Access Channel (PRACH) opportunity of a four-step random access type is shared with a two-step random access type; When the PRACH opportunity of the four-step random access type is shared with the two-step random access type, receive Message A from the terminal, the Message A including a preamble based on a first configuration of the PRACH opportunity, wherein the first configuration of the PRACH opportunity is common to the four-step random access type and the two-step random access type; When the PRACH opportunity of the four-step random access type is not shared with the two-step random access type, receive Message A from the terminal, the Message A including a preamble based on a second configuration of the PRACH opportunity, wherein the second configuration of the PRACH opportunity is configured separately for the two-step random access type.

17. The base station according to claim 16, wherein, When the PRACH opportunity of the four-step random access type is shared with the two-step random access type, the preamble index of the preamble associated with the Synchronization Signal Block (SSB) starts from an index determined according to the starting point of the preamble index of the preamble assigned to the four-step random access type associated with the SSB and the total number of preambles for the four-step random access type.

18. The base station according to claim 16, further comprising: Send the first configuration of the PRACH opportunity to the terminal.

19. The base station according to claim 16, wherein the message further includes information indicating a subset of the PRACH opportunities of the four-step random access type shared with the two-step random access type.

20. The base station according to claim 19, wherein, The subset is a subset of the PRACH opportunities of the four-step random access type shared with the two-step random access type that are associated with the same SSB, and the subset is within the complete mapping circle from the SSB to the random access opportunity.

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