User equipment and method for falling back on physical uplink shared channel transmission

Abstract

Embodiments of the present application relate to a user equipment (UE) and a method for falling back on physical uplink shared channel (PUSCH) transmission. The method includes the UE being configured or indicated by a base station (BS) with a first transmit (Tx) beam and a second transmit (Tx) beam, wherein the first Tx beam and the second Tx beam are configured for transmission via a physical uplink control channel (PUCCH), and the UE sends the first Tx beam on a PUCCH resource in a first PUCCH resource group and the UE sends the second Tx beam on a PUCCH resource in a second PUCCH resource group.

Description

Technical Field

[0001] The present application relates to the field of communication systems, and in particular to user equipment (UE) and methods for falling back on physical uplink shared channel (PUSCH) transmission. Background Art

[0002] In the current design, the transmit (Tx) beam determination method is not applicable to the new design of Tx beam indication for physical uplink control channel (PUCCH) resources, wherein the Tx beam determination method is used for PUSCH scheduled by downlink control information (DCI) format, including DCI format 0_0. In particular, the current Tx beam indication design for PUSCH scheduled by DCI format 0_0 is not applicable to the case of multiple transmission and receiving points (TRP).

[0003] Therefore, a UE and a method for backing off PUSCH transmission are needed. Summary of the invention

[0004] The present application proposes a UE and a method for fallback PUSCH transmission, which can provide high reliability, low overhead and low delay signaling to support DCI format-based PUSCH transmission in a multi-TRP system.

[0005] In a first aspect of the present application, a method for backing off PUSCH for a UE is provided. The method includes the UE being configured or indicated with a first Tx beam and a second Tx beam through a base station (BS), wherein the first Tx beam and the second Tx beam are configured for transmission through a PUCCH, and the UE sends the first Tx beam on a PUCCH resource in a first PUCCH resource group and the UE sends the second Tx beam on a PUCCH resource in a second PUCCH resource group.

[0006] In a second aspect of the present application, a UE for fallback PUSCH transmission is provided. The UE includes a memory, a transceiver, and a processor coupling the memory and the transceiver. The processor is configured or indicated by a BS to have a first Tx beam and a second Tx beam, wherein the first Tx beam and the second Tx beam are configured to be used for transmission through a PUCCH, and the UE sends the first Tx beam on a PUCCH resource in a first PUCCH resource group and the UE sends the second Tx beam on a PUCCH resource in a second PUCCH resource group.

[0007] According to a third aspect of the present application, a non-transitory machine-readable storage medium storing instructions is provided. When the instructions are executed by a computer, the computer executes the above method.

[0008] In a fourth aspect of the present application, a chip is provided, comprising a processor configured to call and run a computer program stored in a memory so that a device equipped with the chip executes the above method.

[0009] In a fifth aspect of the present application, a computer-readable storage medium is provided, storing a computer program, wherein the computer program enables a computer to execute the above method.

[0010] In a sixth aspect of the present application, a computer program product is provided, comprising a computer program, wherein the computer program enables a computer to execute the above method.

[0011] In a seventh aspect of the present application, a computer program is provided, which enables a computer to execute the above method. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or related technologies, the embodiments are briefly introduced below through the accompanying drawings. Obviously, the accompanying drawings are only some embodiments of the present invention, and ordinary technicians in this field can obtain other drawings based on these drawings without paying any prerequisites.

[0013] Figure 1 is a block diagram of a transmitter for downlink or uplink transmission.

[0014] Figure 2 is a block diagram of a receiver for receiving downlink or uplink transmissions.

[0015] Figure 3 It is a block diagram of a UE and a BS for fallback PUSCH transmission provided in an embodiment of the present application.

[0016] Figure 4 It is a flowchart of the method for UE's fallback PUSCH transmission provided in an embodiment of the present application.

[0017] Figure 5 It is a flowchart of a method provided by an embodiment of the present application for determining the spatial relationship of PUSCH transmission scheduled by a DCI format including DCI format 0_0.

[0018] Figure 6 It is a block diagram of a system for wireless communication provided in an embodiment of the present application. DETAILED DESCRIPTION

[0019] The technical matters, structural features, objectives and effects of the embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. Specifically, the terms in the embodiments of the present invention are only used to illustrate the purpose of the embodiments of the present invention and are not used to limit the present invention.

[0020] 5G wireless systems are typically multi-beam based systems in frequency range 2 (FR2) from 24.25 GHz to 52.6 GHz, where base stations and / or user equipment use multiplexed Tx and receive (Rx) analog beams to combat large path losses in high-bands. In high-band systems, such as mmWave systems, base stations and user equipment are deployed with a large number of antennas, so that high-gain beamforming can be used to overcome large path losses and signal obstructions. Due to hardware limitations and costs, base stations and user equipment may be equipped with only a limited number of transmission and reception units (TXRUs). Therefore, hybrid beamforming mechanisms can be used in both base stations and user equipment. In order to obtain the best link quality between the base station and the user equipment, the base station and the user equipment need to align the direction of the analog beams for a specific downlink or uplink transmission. For downlink transmission, the base station and the user equipment need to find the best pair of base station transmit beams and user equipment receive beams, while for uplink transmission, the base station and the user equipment need to find the best pair of user equipment transmit beams and base station receive beams.

[0021] For communication between a user equipment and a base station, the base station and the user equipment need to determine which transmit and receive beams to use. When a user equipment moves, the beams used by the base station and the user equipment for communication may change. In the 3GPP5G specification, the following functions are defined to support this multi-beam based operation.

[0022] In operations associated with beam measurement and reporting, in this functionality, a user equipment may measure one or more transmit beams of a base station, and the user equipment may then select the best transmit beam and report its selection to the base station. By measuring the transmit beam of the base station, the user equipment may also measure one or more different receive beams, and then select the best receive beam for a particular transmit beam of the base station. In this functionality, the gNB may also measure one or more transmit beams of the user equipment, and then select the best transmit beam of the user equipment for uplink transmission. To support measuring the transmit beam of the base station, the BS may transmit multiple reference signal (RS) resources, and then configure the user equipment to measure these RS resources. Thereafter, the user equipment may report the index of one or more selected RS resources, the one or more selected RS resources being selected based on a certain metric (e.g., layer 1 reference signal received power (L1-RSRP)). To support measuring the transmit beam of the user equipment for uplink transmission, the base station may configure the user equipment to transmit one or more uplink RS resources (e.g., sounding reference signal (SRS) resources), and then the base station may measure these RS resources. The base station may determine which transmit beam of the user equipment is best for uplink transmission based on measuring, for example, the L1-RSRP of the RS resources.

[0023] In an operation associated with beam indication, for downlink transmission, the base station may indicate to the user equipment which transmit beam of the base station to use for transmission, so that the user equipment may use an appropriate receive beam to receive the downlink transmission. For physical downlink control channel (PDCCH) transmission, the base station may indicate to the user equipment an identifier (ID) of a transmit beam of the base station. For physical sidelink discovery channel (PSDCH) transmission, the base station may use the DCI in the PDCCH to indicate an identifier of a transmit beam used to transmit the corresponding PDSCH. For uplink transmission from the user equipment, the base station may also indicate to the user equipment which transmit beam to use. For example, for PUCCH transmission, the user equipment uses the transmit beam indicated by the base station through the configuration of spatial relationship information. For SRS transmission, the user equipment uses the transmit beam indicated by the base station through the configuration of spatial relationship information. For PUSCH transmission, the user equipment uses the transmit beam indicated by the information unit contained in the scheduling DCI.

[0024] In operations associated with beam switching, the base station uses this function to switch the transmit beam used for downlink or uplink transmission. This function is useful when the transmit beam currently used for transmission expires due to, for example, the movement of the user equipment. When the base station finds that the transmit beam currently used for downlink transmission is not good or finds another transmit beam that is better than the current transmit beam, the base station can send signaling to the user equipment to notify the change of the transmit beam. Similarly, the base station can switch the uplink transmit beam used for the user equipment transmitting some uplink transmissions.

[0025] In a communication system such as a new radio (NR) system, a downlink signal may include control signaling for transmitting DCI through PDCCH, data signals for transmitting information packets through PDSCH, and some types of reference signals. DCI may indicate information on how PDSCH is transmitted, including, for example, resource allocation and transmission parameters for PDSCH. A base station may transmit one or more types of reference signals for different purposes, including: a demodulation reference symbol (DM-RS) transmitted together with PDSCH and used by a user equipment to demodulate PDSCH, a channel state information reference signal (CSI-RS) used by a user equipment to measure the CSI of a transmit beam of a base station or a downlink channel between a base station and a user equipment, and a phase tracking reference signal (PT-RS) also transmitted together with PDSCH and used by a user equipment to estimate phase noise caused by imperfections in the radio frequency part of a transmitter and a receiver and then compensate for it when decoding PDSCH. In NR, downlink resource allocation for PDCCH, PDSCH and reference signals is performed in units of orthogonal frequency division multiplexing (OFDM) symbols and a set of physical resource blocks (PRBs). Each PRB contains several resource elements (REs) in the frequency domain, for example, 12 REs. The transmission bandwidth (BW) of a downlink transmission consists of frequency resource elements called resource blocks (RBs), and each RB consists of several subcarriers or REs (for example, 12 subcarriers or REs).

[0026] The UL signals transmitted by the user equipment to the base station may include: data signals for transmitting data packets through PUSCH, uplink control signals for transmitting UL control information (UCI) that may be transmitted in PUSCH or PUCCH, and UL reference signals. UCI may carry a scheduling request (SR) used by the user equipment to request uplink transmission resources, a hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback for PDSCH transmission, or a channel state information (CSI) report. For different purposes, the user equipment may transmit one or more types of uplink reference signals, including: DM-RS transmitted with PUSCH transmission and used by the base station to demodulate PUSCH, PT-RS also transmitted with PUSCH and used by the base station to estimate phase noise caused by imperfections in the RF part, which the base station can then compensate for when decoding PUSCH, and SRS signals used by the base station to measure CSI of one or more user equipment transmit beams or uplink channels between the user equipment and the base station. Similarly, UL resource allocation for PUSCH, PUCCH, and UL reference signal is also performed in units of symbols and a set of PRBs.

[0027] The transmission interval for DL ​​or UL channel / signal is called a time slot, and each time slot contains several (e.g. 14) symbols in the time domain. In the NR system, the duration of a time slot can be 1, 0.5, 0.25 or 0.123 milliseconds for subcarrier spacings of 15KHz, 30KHz, 60KHz and 120KHz, respectively. The NR system supports a flexible basic parameter set, and an embodiment can select a suitable OFDM subcarrier spacing based on deployment scenarios and service requirements. In the NR system, different basic parameter sets can be used for DL ​​and UL transmissions.

[0028] Figure 1 A block diagram of a transmitter for downlink or uplink transmission is shown. Figure 1The embodiment of the transmitter block shown is for illustration only. Other embodiments may be used without departing from the scope of the present disclosure. The information bits 001 may first be encoded by an encoder 002 (e.g., a low density parity check (LDPC) encoder or a polar encoder) and then modulated by a modulator 003. The modulation may be, for example, binary phase-shift keying (BPSK), quadrature amplitude modulation (QAM) 4, QAM 16, QAM 64, or QAM 256. A serial to parallel (S / P) converter 004 may then generate a plurality of modulation symbols in parallel, which are then input to an RE mapper and precoder 005. The RE mapper and precoder 005 may map the modulation symbols to selected REs and then apply a precoder to the modulation symbols on the bandwidth resources allocated for DL ​​or UL transmission. Then, in 006, the modulation symbol is applied with an inverse fast Fourier transform (IFFT), and then its output is serialized by a parallel to serial (P / S) converter 007. After that, the signal is sent to a transmitting unit 008 including, for example, a digital-to-analog (D / A) converter, a radio frequency converter, a filter, a power amplifier, and a transmitting antenna element, and is transmitted.

[0029] Figure 2 A block diagram of a receiver for receiving a downlink or uplink transmission is shown. Figure 2 The embodiment of the receiver block shown is for illustration only. Other embodiments may be used without departing from the scope of the present disclosure. The received signal 011 first passes through a receiving unit 012 including, for example, a receiving antenna element, a low noise power amplifier, a radio frequency converter and a filter. And its output passes through a P / S 013, and then a fast Fourier transform (FFT) 014 is applied. After conversion to the frequency domain, the useful signal is extracted by RE demapping 015 according to the resource allocation for DL ​​or UL transmission. Subsequently, a demodulator 016 demodulates the data symbols using a channel estimate calculated based on the DM-RS, and then a decoder 017 (e.g., an LDPC decoder or a polarization decoder) decodes the demodulated data to output information bits 018.

[0030] In NR3GPP specification version 15, beam indication is performed per PUCCH resource. For a given uplink bandwidth part (BWP) in a serving cell, four PUCCH resource sets can be configured for the UE, and in each PUCCH resource set, one or more PUCCH resources are configured for the UE. For transmission on each PUCCH resource, the UE is configured with the parameter PUCCH-spatialRelationInfo, which may contain one or more reference signal resource IDs. Each of these reference signal resources is used to provide information about which transmit beam the UE can use to transmit on the PUCCH resource. For example, if the reference signal resource is an SRS resource, the UE may use the same Tx beam used to transmit the SRS resource for transmission on the PUCCH resource. If the reference signal resource is a CSI-RS resource or a synchronization signal / physical broadcast channel (SS / PBCH) block, the UE may use the uplink Tx beam corresponding to the receive beam used to receive the CSI-RS resource transmission or the SS / PBCH block transmission for transmission on the PUCCH resource. The gNB may configure only one PUCCH-spatialRelationInfo for a PUCCH resource. When the gNB wants to switch the Tx beam for that PUCCH resource, the gNB may reconfigure the radio resource control (RRC) parameters. The gNB may also configure multiple PUCCH-spatialRelationInfo for a PUCCH resource in RRC, and then use medium access control control element (MAC CE) signaling to deactivate one of the configured PUCCH-spatialRelationInfo as the current Tx beam for that PUCCH resource. If the gNB wants to switch the Tx beam for a PUCCH resource, the gNB may use a MAC CE message to indicate another PUCCH-spatialRelationInfo for that PUCCH resource. The gNB may use a MAC CE message to indicate the PUCCH-spatialRelationInfo for each individual PUCCH resource. The advantage of this approach is that it is highly flexible and enables the gNB to apply different Tx beams on different PUCCH resources.

[0031] For a PUSCH scheduled by DCI format 0_0 on a cell, the UE may be requested to transmit the PUSCH according to the spatial relationship corresponding to the dedicated PUCCH resource with the smallest ID within the UL BWP of the cell. In other words, if a PUSCH transmission by DCI format 0_0 is scheduled for a UE in one UL BWP, the UE may transmit the PUSCH using the Tx beam configured for the PUCCH with the smallest PUCCH resource ID in the same UL BWP.

[0032] In 3GPP Release 16, the Tx beam indication / update of PUCCH resources will be changed to be performed by PUCCH group. In one UL BWP, all PUCCH resources can be divided into one group or two groups. The use case of one group is single TRP transmission, while the use case of two groups is multi-TRP transmission. Each TRP can schedule PUSCH transmission for the UE, and the UE can apply different Tx beams accordingly.

[0033] Figure 3 The UE 10 and BS 20 for backing off PUSCH transmission provided in some embodiments of the present application are shown. The UE 10 may include a processor 11, a memory 12, and a transceiver 13. The base station 20, such as a generating node B (gNB), may include a processor 21, a memory 22, and a transceiver 23. The processor 11 or 21 may be configured to implement the proposed functions, processes, and / or methods described in this specification. The layers of the radio interface protocol may be implemented in the processor 11 or 21. The memory 12 or 22 is operably coupled to the processor 11 or 21 and stores various information to operate the processor 11 or 21. The transceiver 13 or 23 is operably coupled to the processor 11 or 21, and the transceiver 13 or 23 sends and / or receives radio signals.

[0034] The processor 11 or 21 may include an application-specific integrated circuit (ASIC), other chipsets, logic circuits and / or data processing devices. The memory 12 or 22 may include a read-only memory (ROM), a random access memory (RAM), flash memory, a memory card, a storage medium and / or other storage devices. The transceiver 13 or 23 may include a baseband circuit for processing radio frequency signals. When the embodiment is implemented in software, the techniques described herein may be implemented with modules (e.g., processes, functions, etc.) that perform the functions described herein. The modules may be stored in the memory 12 or 22 and executed by the processor 11 or 21. The memory 12 or 22 may be implemented within the processor 11 or 21 or outside the processor 11 or 21, where those may be communicatively coupled to the processor 11 or 21 in various ways known in the art.

[0035] According to the sidelink technology developed under 3GPP Release 14, 15, 16 and above, the communication between UEs involves vehicle-to-everything (V2V), vehicle-to-pedestrian (V2P) and vehicle-to-infrastructure / network (V2I / N) vehicle-to-everything (V2X) communication. UEs communicate directly with each other through a sidelink interface such as a PC5 interface.

[0036] In some embodiments, the processor 11 is configured or indicated by the base station 20 to have a first Tx beam and a second Tx beam, wherein the first Tx beam and the second Tx beam are configured to be used for transmission through a PUCCH. The processor 11 is configured to send the first Tx beam on a PUCCH resource in a first PUCCH resource group and the UE sends the second Tx beam on a PUCCH resource in a second PUCCH resource group. The UE 10 may determine a Tx beam for PUSCH transmission based on an association between a PDCCH that detects a scheduling DCI, the first Tx beam, and the second Tx beam.

[0037] In some embodiments, the processor 11 is used to divide the PUCCH resources into a first PUCCH resource group and a second PUCCH resource group. In some embodiments, for a PUSCH transmission scheduled by a DCI format detected by the processor 11, the processor 11 also determines one of the first Tx beam and the second Tx beam to be used based on the configuration of the PDCCH and the association between the PDCCH, the first Tx beam and the second Tx beam, wherein the DCI format is detected in the PDCCH. In some embodiments, the DCI format includes DCI format 0_0. In some embodiments, the processor 11 is also configured with a high-layer index associated with the configuration of a control resource set, wherein the PUSCH transmission scheduled by the DCI format is performed by monitoring the PDCCH in a search space associated with the control resource set, and the method further includes determining the spatial relationship of the PUSCH transmission based on the value of the high-layer index.

[0038] In some embodiments, the processor 11 is configured to have multiple PUCCH resources in a given uplink bandwidth portion of a cell, and each PUCCH resource is linked or configured with a PUCCH resource group identifier. In some embodiments, the processor 11 is configured with a control resource set group identifier in a control resource set, and is configured with an association between the PUCCH resource group identifier and the control resource set group identifier. In some embodiments, the control resource set is associated with one or more PUCCH resources.

[0039] In some embodiments, the processor 11 is further configured with a time slot aggregation configuration for PUSCH transmission, wherein when the transceiver 13 receives a DCI format for scheduling PUSCH transmission, the processor 11 repeats the transmission block across N consecutive time slots according to the configuration of the time slot aggregation. In some embodiments, the processor 11 is indicated with a first PUCCH-spatial relationship information value and a second PUCCH-spatial relationship information value, and the method further includes determining which of the first PUCCH-spatial relationship information value and the second PUCCH-spatial relationship information value the value of the high-level index corresponds to. In some embodiments, the first PUCCH-spatial relationship information value and the second PUCCH-spatial relationship information value both include a channel state information reference signal resource index, a sounding reference signal resource index, or a synchronization signal / physical broadcast channel block index.

[0040] Figure 4The method 400 for fallback PUSCH transmission of a UE according to an embodiment of the present application is illustrated. The method 400 includes: a box 410, the UE is configured or indicated by the BS to have a first Tx beam and a second Tx beam, wherein the first Tx beam and the second Tx beam are configured for transmission through a PUCCH, and a box 420, the UE sends the first Tx beam on a PUCCH resource in a first PUCCH resource group and the UE sends the second Tx beam on a PUCCH resource in a second PUCCH resource group. The method 400 performed by the UE can determine the Tx beam used for PUSCH transmission based on the association between the physical downlink control channel (PDCCH) for scheduling downlink control information (DCI), the first Tx beam, and the second Tx beam.

[0041] In some embodiments, the method further includes dividing the PUCCH resources into a first PUCCH resource group and a second PUCCH resource group. In some embodiments, for a PUSCH transmission scheduled by a DCI format detected by the UE, the method further includes determining one of the first Tx beam and the second Tx beam to be used based on a configuration of a PDCCH and an association between the PDCCH, the first Tx beam, and the second Tx beam, wherein the DCI format is detected in the PDCCH. In some embodiments, the DCI format includes DCI format 0_0. In some embodiments, the method further includes being configured with a high-layer index associated with a configuration of a control resource set, wherein the PUSCH transmission scheduled by the DCI format is performed by monitoring the PDCCH in a search space associated with the control resource set, and the method further includes determining the spatial relationship of the PUSCH transmission based on the value of the high-layer index.

[0042] In some embodiments, the method further comprises being configured with a plurality of PUCCH resources in a given uplink bandwidth portion of the cell, and each PUCCH resource is linked or configured with a PUCCH resource group identifier. In some embodiments, in the configuration of the control resource set, the method comprises being configured with a control resource set group identifier in a control resource set, and being configured with an association between the PUCCH resource group identifier and the control resource set group identifier. In some embodiments, the control resource set is associated with one or more PUCCH resources.

[0043] In some embodiments, the method further includes being configured with a time slot aggregation configuration for PUSCH transmission, wherein when the UE receives a DCI format for scheduling PUSCH transmission, the UE repeats the transmission block across N consecutive time slots according to the configuration of the time slot aggregation. In some embodiments, the method further includes being indicated with a first PUCCH-spatial relationship information value and a second PUCCH-spatial relationship information value, the method further includes determining which of the first PUCCH-spatial relationship information value and the second PUCCH-spatial relationship information value the value of the high-level index corresponds to. In some embodiments, the first PUCCH-spatial relationship information value and the second PUCCH-spatial relationship information value both include a channel state information reference signal resource index, a sounding reference signal resource index, or a synchronization signal / physical broadcast channel block index.

[0044] Figure 5 A method for determining the spatial relationship of PUSCH transmission scheduled by a DCI format including DCI format 0_0 according to an embodiment of the present application is illustrated.

[0045] exist Figure 1 In the example shown. Figure 5, at operation 510, the UE is configured with two CORESETs. The first CORESET is associated with a high-layer index set to 0 and the second CORESET is associated with a high-layer index set to 1. At operation 520, the UE may be indicated with two spatialRelation_info values ​​for PUCCH resources in a given BWP, the first spatialRelation_info and the second spatialRelation_info. The UE may be requested to apply the first spatial relationship information to the transmission of a subset of PUCCH resources in a given BWP, and the UE may be requested to apply the second spatial relationship information to the transmission of other PUCCH resources in a given BWP. At operation 530, the UE may detect a DCI format 0_0 in the PDCCH and the DCI format 0_0 schedules a PUSCH transmission. Then at operation 540, the UE may determine the value of the high-layer index associated with the CORESET in which the DCI format 0_0 is detected. In other words, the UE may determine the value of the high-layer index associated with the CORESET associated with the search space in which the DCI format 0_0 is detected. At operation 550, the UE may determine whether the value of the high-layer index is 0 or 1. In other words, if the high-layer index associated with CORESET is set to 0, for that PUSCH scheduled by DCI format 0_0, the UE may transmit the PUSCH according to the spatial relationship corresponding to the indicated first spatialRelation_info at operation 560. On the other hand, if the high-layer index associated with CORESET is set to 1, for the PUSCH scheduled by DCI format 0_0, the UE may transmit the PUSCH according to the spatial relationship corresponding to the indicated first spatialRelation_info at operation 570.

[0046] In some embodiments of the present application, a transmission method of a PUSCH scheduled by DCI format 0_0 is proposed. In some embodiments, a beam may correspond to an RS resource, and the RS resource may be a CSI-RS resource, an SRS resource, an SS / PBCH block, or any other type of RS.

[0047] In one embodiment, the UE may be configured or indicated with two Tx beams, a first Tx beam and a second Tx beam, for uplink PUCCH transmission. The UE may divide the UE-specifically configured PUCCH resources into two groups, a first PUCCH resource group and a second PUCCH resource group. The UE may apply the first Tx beam to transmissions on PUCCH resources in the first group of PUCCH resources, and apply the second Tx beam to transmissions on PUCCH resources in the second group of PUCCH resources. For transmissions of PUSCH scheduled by DCI format 0_0, the UE may determine which of the first Tx beam or the second Tx beam may be used based on the configuration of the PDCCH detected for DCI format 0_0 and the association between the PDCCH and the Tx beam indicated for the PUCCH resources.

[0048] In one method, a UE may be configured with a first high-layer index associated with a configuration of a first control resource set (CORESET). For a PUCCH resource in a given UL BWP in a cell, the UE may be indicated by two PUCCH-SpatialRelationInfo values, a first PUCCH-SpatialRelationInfo value and a second PUCCH-SpatialRelationInfo value. In one example, the PUCCH-SpatialRelationInfo value may be signaled via high-layer signaling, such as a MAC CE message or an RRC message. For a PUSCH transmission scheduled by DCI format 0_0, which is detected by monitoring the PDCCH in a search space associated with the first CORESET, the UE may determine the spatial relationship of the transmission on the PUSCH based on the value of the high-layer index associated with the configuration of the first CORESET.

[0049] In some embodiments, if the first high-layer index associated with the configuration of the first CORSET is set to, for example, 0, the UE may send the PUSCH transmission according to the spatial relationship corresponding to the first PUCCH-SpatialRelationInfo value indicated for the PUCCH resource in a given UL BWP. In some embodiments, if the first high-layer index associated with the configuration of the first CORSET is set to, for example, 1, the UE may send the PUSCH transmission according to the spatial relationship corresponding to the second PUCCH-SpatialRelationInfo value indicated for the PUCCH resource in a given UL BWP. In some embodiments, each PUCCH-SpatialRelationInfo value contains a CSI-RS resource index or an SRS resource index or an SS / PBCH block index. For transmissions of PUSCH scheduled by DCI format 0_0, if the corresponding PUCCH-SpatialRelationInfo value used by the UE contains a CSI-RS resource or an SS / PBCH block, the UE may use the same spatial domain transmit filter as the spatial domain receive filter used to receive the CSI-RS resource or SS / PBCH block. In some embodiments, if the corresponding PUCCH-SpatialRelationInfo value used by the UE includes an SRS resource, the UE may use the same spatial domain transmit filter as that used to transmit the SRS resource.

[0050] In one method, multiple PUCCH resources can be configured for a UE in a given UL bandwidth part (BWP) in a cell. And these PUCCH resources can be configured in two PUCCH resource groups, and each PUCCH resource can be linked or configured with a PUCCH resource group ID. In the configuration of CORESET, a CORSET group ID of a CORESE can be configured for the UE. The UE can configure the association between the PUCCH resource group ID and the CORSET group ID. For each PUCCH resource group, a PUCCHspatialrelation_info value can be used to indicate or notify the UE, and the UE can be requested to send any PUCCH resource in the PUCCH resource group according to the spatial relationship corresponding to the PUCCHspatialrelation_info value configured or indicated for the group. In some embodiments, for a PUSCH scheduled by DCI format 0_0, the UE may be requested to send the PUSCH according to a spatial relationship corresponding to a PUCCH spatialrelation_info value configured or indicated for a PUCCH group with a PUCCH group ID, where the PUCCH group with the PUCCH group ID is associated with the CORESET group ID of the CORESET in which DCI format 0_0 is detected.

[0051] In one method, a UE may be configured with a CORSET and the CORSET is associated with one or more PUCCH resources. For a PUSCH scheduled by DCI format 0_0 detected in the CORESET, the UE may be requested to send the PUSCH according to the spatial relationship corresponding to the PUCCH spatailRelation_info configured to the PUCCH resource with the lowest ID in the PUCCH resources. The PUCCH resource is associated with the CORESET where DCI format 0_0 is detected.

[0052] As described in 3GPP Release 15, for PUSCH transmissions, the UE can configure a slot aggregation factor to indicate slot-level repetition of a PUSCH transmission. The slot aggregation slot factor can take values ​​of 2, 4, or 8. When the UE receives a DCI format 0_0 scheduling a PUSCH transmission in slot n, the UE shall repeat the same transport block in N consecutive slots, applying the same time-domain symbol allocation in each slot.

[0053] In one embodiment, the UE may be configured with time slot aggregation for PUSCH transmission, and the UE may configure / indicate that there are two Tx beams, a first Tx beam and a second Tx beam, for uplink PUCCH transmission in a BWP in the cell. The UE may explicitly or implicitly divide the PUCCH resources configured in the BWP into two groups, the UE may apply the first Tx beam to the transmission of PUCCH resources in those PUCCH resources in the first PUCCH group, and the UE may apply the second Tx beam to the transmission of PUCCH resources in those PUCCH resources in the second PUCCH resource group. When the UE receives DCI format 0_0 scheduling PUSCH transmission, the UE may repeat the transmission block on N consecutive time slots according to the time slot aggregation configuration for PUSCH transmission, and may request the UE to apply a spatial relationship on these PUSCH transmissions according to one or more of the following. 1. The UE may configure a CORESET, and the CORESET is associated with a high-level index (e.g., referred to as a CORESET group ID). When the UE detects a DCI format 0_0 in the CORESET, the UE may apply a spatial relationship to all transport block repetitions, which corresponds to the first Tx beam or the second Tx beam based on the value of the high-layer index associated with the CORESET in which the DCI format 0_0 is detected. For example, if the value of the high-layer index is 0, the UE selects the first Tx beam, and if the value of the high-layer index is 1, the UE selects the second Tx beam. The UE may apply the first Tx beam and the second Tx beam alternately on the transport block repetition according to some configuration or predefined pattern. For example, the UE may configure the time slot aggregation factor to be equal to 4. The UE receives a DCI format 0_0 in time slot n, which schedules PUSCH transmission starting from time slot n+m. The UE may then transmit PUSCH in time slots n+m, n+m+1, n+m+2, and n+m+3. For such PUSCH transmission, the UE may be requested or configured to apply the first Tx beam on the PUSCH in time slot n+m, the second Tx beam on the PUSCH in time slot n+m+1, the first Tx beam on the PUSCH in time slot n+m+2, and the second Tx beam on the PUSCH in time slot n+m+3.

[0054] In one method, the UE may be configured with a high-layer index associated with the configuration of the CORESET. For a PUCCH resource in a given UL BWP in a cell, the UE may be indicated by two PUCCH-SpatialRelationInfo values, a first PUCCH-SpatialRelationInfo value and a second PUCCH-SpatialRelationInfo value. In one example, the PUCCH-SpatialRelationInfo value may be signaled via high-layer signaling, such as a MACCE message or an RRC message. For PUSCH transmission, the UE may be configured with one or more of the following. 1. A PUSCH slot aggregation factor, which may be used to indicate how many slots (or subslots) the same PUSCH may be repeated. 2. A PUSCH spatial relationship mode for PUSCH repetition. An example of this parameter is a bitmap for indicating which Tx beam may be applied to a transport block transmission. For example, a bitmap a1a2…a8, and each bit in the bitmap may indicate which of the PUCCH-SpatialRelationInfo values ​​may be applied to the corresponding PUSCH repetition. For example, ai equal to 0 may indicate a first PUCCH-SpatialRelationInfo value, and ai equal to 1 may indicate a second PUCCH-SpatialRelationInfo value.

[0055] In some embodiments, for transmissions of a PUSCH scheduled by DCI format 0_0, the UE may determine the spatial relationship for each transmission opportunity of a transport block that applies to that PUSCH based on one or more of the following factors: 1. The higher layer index value configured for the CORESET for which DCI format 0_0 is detected. 2. The association between the higher layer index value configured for the CORSET and the PUCCH group, or the spatialrelation_info value indicated for the PUCCH in a given BWP. 3. The configured PUSCH aggregation factor. 4. The configured PUSCH spatial relation mode.

[0056] In one method, if the value of the configured higher layer index implicitly or explicitly corresponds to DCI format 0_0 detected in the CORESET of the first PUCCH-SpatialRelationInfo value, the UE may be requested to apply the spatial relationship at each transmission opportunity of the transport block as follows. 1. In the configured PUSCH spatial relationship mode, if a is equal to 0, the UE may apply the spatial relationship corresponding to the first PUCCH-SpatialRelationInfo at the nth transmission opportunity of the TB. 2. In the configured PUSCH spatial relationship mode, if a is equal to 1, the UE may apply the spatial relationship corresponding to the second PUCCH-SpatialRelationInfo at the nth transmission opportunity of the transport block.

[0057] In one method, if DCI format 0_0 is detected in a CORESET where the value of the configured higher layer index implicitly or explicitly corresponds to the second PUCCH-SpatialRelationInfo value, the UE may be requested to apply the spatial relationship at each transmission opportunity of the transport block as follows. 1. In the configured PUSCH spatial relationship mode, if a is equal to 0, the UE may apply the spatial relationship corresponding to the second PUCCH-SpatialRelationInfo at the nth transmission opportunity of the transport block. In the configured PUSCH spatial relationship mode, if a is equal to 1, the UE may apply the spatial relationship corresponding to the first PUCCH-SpatialRelationInfo at the nth transmission opportunity of the transport block.

[0058] In one method, if DCI format 0_0 is detected in a CORESET without a configured high-level index, the UE may be requested to apply a spatial relationship at each transmission opportunity of a transport block as follows. 1. In the configured PUSCH spatial relationship mode, if an is equal to 0, the UE may apply the spatial relationship corresponding to the first PUCCH-SpatialRelationInfo at the nth transmission opportunity of the transport block. 2. In the configured PUSCH spatial relationship mode, if an is equal to 1, the UE may apply the spatial relationship corresponding to the second PUCCH-SpatialRelationInfo at the nth transmission opportunity of the transport block.

[0059] In summary, in some embodiments of the present application, a method for a UE to determine spatial relationship information for transmission of a PUSCH scheduled by DCI format 0_0 is proposed. For all PUCCH resources configured in a given BWP, the PUCCH resources can be explicitly or implicitly divided into two groups. For one of such groups, the gNB can indicate a spatialrelation_info that applies to all PUCCH resources contained in the group. For a PUSCH scheduled by DCI format 0_0, the UE can determine the spatial relationship of the PUSCH transmission based on the value of the high-layer index configured for the PDCCH in which DCI format 0_0 is detected and the association between the high-layer index and the PUCCH group for spatialrelation_info indication.

[0060] According to some embodiments of the present application, in a multi-TRP system, each TRP can use DCI format 0_0 to flexibly and dynamically schedule PUSCH transmission to the UE. For different TRP receptions, the UE can apply different appropriate Tx beams on the PUSCH transmission accordingly. When switching PUSCH reception and scheduling TRP, no high-level signaling configuration and reconfiguration is required. Therefore, the method proposed in some embodiments of the present application can provide low-overhead and low-latency signaling for supporting PUSCH transmission based on DCI 0_0 in a multi-TRP system.

[0061] In an embodiment of the present application, a UE and a method for fallback PUSCH transmission can provide high reliability, low overhead and low latency signaling for supporting DCI formats to support PUSCH transmission based on DCI formats in TRP systems. Each TRP can schedule PUSCH transmission for the UE, and the UE can apply different Tx beams accordingly. The embodiments of the present application are a combination of technologies / processes that can be adopted in the 3GPP specification to create a final product.

[0062] Figure 6 7 is a block diagram of an example system 700 for wireless communication according to an embodiment of the present application. The embodiments described herein may be implemented into a system using any appropriately configured hardware and / or software. Figure 6 A system 700 is shown, which includes a radio frequency (RF) circuit 710, a baseband circuit 720, an application circuit 730, a memory / storage device 740, a display 750, a camera 760, a sensor 770, and an input / output (I / O) interface 780, coupled to each other at least as shown.

[0063] Application circuitry 730 may include circuitry such as, but not limited to, one or more single-core or multi-core processors. The processor may include any combination of general-purpose processors and special-purpose processors (e.g., graphics processors and application processors). The processor may be coupled to a memory / storage device and configured to execute instructions stored in the memory / storage device to enable various applications and / or operating systems to run on the system.

[0064] The baseband circuit 720 may include circuits, such as but not limited to one or more single-core or multi-core processors. The processor may include a baseband processor. The baseband circuit may handle various wireless control functions that can communicate with one or more wireless networks via RF circuits. The wireless control functions may include but are not limited to signal modulation, encoding, decoding, radio frequency shifting, etc. In some embodiments, the baseband circuit may provide communications compatible with one or more wireless technologies. For example, in some embodiments, the baseband circuit may support communications with an evolved universal terrestrial radio access network (EUTRAN) and / or other wireless metropolitan area networks (WMAN), wireless local area networks (WLAN), and wireless personal area networks (WPAN). An embodiment in which the baseband circuit is configured to support wireless communications of more than one wireless protocol may be referred to as a multi-mode baseband circuit. In various embodiments, the baseband circuit 720 may include circuits for operating with signals that are not strictly considered to be in the baseband frequency. For example, in some embodiments, baseband circuitry may include circuitry for operating with signals having an intermediate frequency between the baseband frequency and the radio frequency.

[0065] The RF circuit 710 can use modulated electromagnetic radiation to achieve communication with a wireless network through a non-solid medium. In various embodiments, the RF circuit may include switches, filters, amplifiers, etc. to facilitate communication with the wireless network. In various embodiments, the RF circuit 710 may include circuits for operating with signals that are not strictly considered to be in radio frequencies. For example, in some embodiments, the baseband circuit may include circuits for operating with signals having an intermediate frequency, which is between the baseband frequency and the radio frequency.

[0066] In various embodiments, the transmitter circuit, control circuit or receiver circuit discussed above with respect to the user equipment, eNB or gNB may be implemented in whole or in part in one or more of the RF circuit, baseband circuit and / or application circuit. As used herein, "circuit" may refer to part of or include the following: an application specific integrated circuit (ASIC), an electronic circuit that executes one or more software or firmware programs, a processor (shared, dedicated or group) and / or a memory (shared, dedicated or group), a combined logic circuit and / or other suitable hardware components that provide the described functions. In some embodiments, the electronic device circuit system may be implemented by one or more software or firmware modules, or the functions associated with the circuit system may be implemented by one or more software or firmware modules. In some embodiments, some or all of the components of the baseband circuit, application circuit and / or memory / storage device may be implemented together on a system on a chip (SOC).

[0067] The memory / storage device 740 can be used to load and store data and / or instructions for the system, for example. The memory / storage device of an embodiment can include any combination of suitable volatile memory (e.g., dynamic random access memory (DRAM)) and / or non-volatile memory (e.g., flash memory). In various embodiments, the I / O interface 780 can include one or more user interfaces and / or peripheral component interfaces, and the one or more user interfaces are designed to enable users to interact with the system, and the peripheral component interface is designed to enable peripheral components to interact with the system. The user interface can include, but is not limited to, a physical keyboard or keypad, a touch pad, a speaker, a microphone, etc. The peripheral component interface can include, but is not limited to, a non-volatile memory port, a universal serial bus (USB) port, an audio jack, and a power interface.

[0068] In various embodiments, sensor 770 may include one or more sensing devices for determining environmental conditions and / or location information related to the system. In some embodiments, sensors may include, but are not limited to, gyroscope sensors, accelerometers, proximity sensors, ambient light sensors, and positioning units. The positioning unit may also be part of or interact with a baseband circuit and / or RF circuit to communicate with components of a positioning network (e.g., a global positioning system (GPS) satellite). In various embodiments, display 750 may include displays such as a liquid crystal display and a touch screen display. In various embodiments, system 700 may be a mobile computing device, such as, but not limited to, a laptop computing device, a tablet computing device, a netbook, an ultrabook, a smart phone, etc. In various embodiments, the system may have more or fewer components and / or different architectures. Where appropriate, the method described herein may be implemented as a computer program. The computer program may be stored on a storage medium such as a non-temporary storage medium.

[0069] It will be appreciated by those skilled in the art that each unit, algorithm and step described and disclosed in the embodiments of the present application are implemented using electronic hardware or a combination of software and electronic hardware for a computer. Whether these functions are run by hardware or software depends on the application conditions and design requirements of the technical solution. Those skilled in the art can use different ways to implement the functions of each specific application, and such implementation should not exceed the scope of the present application. It will be appreciated by those skilled in the art that since the working processes of the above-mentioned systems, devices and units are substantially the same, reference can be made to the working processes of the systems, devices and units in the above-mentioned embodiments. For ease of description and brevity, these working processes will not be described in detail.

[0070] It should be understood that the systems, devices and methods disclosed in the embodiments of the present application can be implemented in other ways. The above embodiments are merely illustrative. The division of units is based only on logical functions, and in practice there may be other division methods. Multiple units or components may be combined or integrated into another system. Some features may be omitted or skipped. On the other hand, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interfaces, devices or units, which may be electrical, mechanical or other forms.

[0071] The units described as separate components may or may not be physically separated. The units used for display may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be used according to the purpose of the embodiment. In addition, the functional units in various embodiments may be integrated into one processing unit, or they may be physically independent, or two or more units may be integrated into one processing unit.

[0072] If the software functional unit is implemented and sold or used as an independent product, it can be stored in a readable storage medium in a computer. Based on such an understanding, the technical solution proposed in the present disclosure can be essentially or partially implemented in the form of a software product. Or a part of the technical solution that contributes to the prior art can be implemented in the form of a software product. The software product in the computer is stored in a storage medium, including multiple commands for a computing device (such as a personal computer, a server, or a network device) to run all or part of the steps disclosed in the embodiments of the present disclosure. The storage medium includes a USB disk, a mobile hard disk, a ROM, a RAM, a floppy disk, or other media capable of storing program code.

[0073] While the present disclosure has been described in connection with what is considered to be the most practical and preferred embodiments, it is to be understood that the application is not limited to the disclosed embodiments but is intended to cover various arrangements that may be made without departing from the broadest interpretation of the appended claims.

Claims

1. A method for fallback physical uplink shared channel transmission of a user equipment, characterized in that: include: The user equipment is configured or instructed by a base station to have a first transmit beam and a second transmit beam, wherein the first transmit beam and the second transmit beam are configured to be used for transmission through a physical uplink control channel; and The user equipment sends the first transmit beam on a physical uplink control channel resource in a first physical uplink control channel resource group, and the user equipment sends the second transmit beam on a physical uplink control channel resource in a second physical uplink control channel resource group; For physical uplink shared channel transmission scheduled by a downlink control information format detected by the user equipment, the method also includes determining one of the first transmit beam and the second transmit beam to be used based on the configuration of the physical downlink control channel and the association between the physical downlink control channel, the first transmit beam and the second transmit beam, wherein the downlink control information format is detected in the physical downlink control channel; the user equipment is also indicated with a first physical uplink control channel-spatial relationship information value and a second physical uplink control channel-spatial relationship information value, and is configured with a high-layer index associated with the configuration of a control resource set, the method also includes determining which of the first physical uplink control channel-spatial relationship information value and the second physical uplink control channel-spatial relationship information value the value of the high-layer index corresponds to; the user equipment is also configured with a time slot aggregation factor of the physical uplink shared channel and at least one of a bitmap of a physical uplink shared channel-spatial relationship pattern for indicating repetition of the physical uplink shared channel.

2. The method according to claim 1, characterized in that The downlink control information format includes downlink control information format 0_0.

3. The method according to claim 1, characterized in that The method also includes being configured with a high-layer index associated with the configuration of a control resource set, wherein the physical uplink shared channel transmission scheduled by the downlink control information format is performed by monitoring the physical downlink control channel in a search space associated with the control resource set, and the method also includes determining the spatial relationship of the physical uplink shared channel transmission based on the value of the high-layer index.

4. The method according to claim 3, characterized in that The method also includes being configured with a plurality of physical uplink control channel resources in a given uplink bandwidth portion of the cell, and each physical uplink control channel resource is linked or configured with a physical uplink control channel resource group identifier.

5. The method according to claim 4, characterized in that In the configuration of the control resource set, the method includes configuring a control resource set with a control resource set group identifier in a control resource set, and configuring an association between the physical uplink control channel resource group identifier and the control resource set group identifier.

6. The method according to claim 3, characterized in that The control resource set is associated with one or more physical uplink control channel resources.

7. The method according to claim 1, characterized in that The first physical uplink control channel-spatial relationship information value and the second physical uplink control channel-spatial relationship information value both include a channel state information reference signal resource index, a sounding reference signal resource index or a synchronization signal / physical broadcast channel block index.

8. A user equipment for falling back on physical uplink shared channel transmission, characterized in that: include: Memory; Transceiver; as well as A processor is coupled to the memory and the transceiver; wherein the processor is configured to: A first transmission beam and a second transmission beam are configured or indicated by a base station, wherein the first transmission beam and the second transmission beam are configured to be used for transmission through a physical uplink control channel; and Sending the first transmit beam on physical uplink control channel resources in a first physical uplink control channel resource group and sending the second transmit beam on physical uplink control channel resources in a second physical uplink control channel resource group; For a physical uplink shared channel transmission scheduled by a downlink control information format detected by the user equipment, the processor further comprises determining one of the first transmit beam and the second transmit beam to be used according to a configuration of a physical downlink control channel and an association between the physical downlink control channel, the first transmit beam, and the second transmit beam, wherein the downlink control information format is detected in the physical downlink control channel; The processor is also indicated with a first physical uplink control channel-spatial relationship information value and a second physical uplink control channel-spatial relationship information value, and is configured with a high-layer index associated with the configuration of a control resource set, and the processor also determines which of the first physical uplink control channel-spatial relationship information value and the second physical uplink control channel-spatial relationship information value the value of the high-layer index corresponds to; the processor is also configured with at least one of a time slot aggregation factor of a physical uplink shared channel and a bitmap of a physical uplink shared channel-spatial relationship pattern for indicating repetition of a physical uplink shared channel.

9. The user equipment according to claim 8, characterized in that The downlink control information format includes downlink control information format 0_0.

10. The user equipment according to claim 8, characterized in that The processor is also configured with a high-layer index associated with the configuration of a control resource set, wherein the physical uplink shared channel transmission scheduled by the downlink control information format is performed by monitoring the physical downlink control channel in a search space associated with the control resource set, and the processor also includes determining the spatial relationship of the physical uplink shared channel transmission based on the value of the high-layer index.

11. The user equipment according to claim 10, characterized in that: The processor is configured with a plurality of physical uplink control channel resources in a given uplink bandwidth portion of a cell, and each physical uplink control channel resource is linked or configured with a physical uplink control channel resource group identifier.

12. The user equipment according to claim 11, characterized in that In the configuration of the control resource set, the processor is configured with a control resource set group identifier in a control resource set, and is configured with an association between the physical uplink control channel resource group identifier and the control resource set group identifier.

13. The user equipment according to claim 10, characterized in that The control resource set is associated with one or more physical uplink control channel resources.

14. The user equipment according to claim 8, characterized in that The first physical uplink control channel-spatial relationship information value and the second physical uplink control channel-spatial relationship information value both include a channel state information reference signal resource index, a sounding reference signal resource index or a synchronization signal / physical broadcast channel block index.

15. A non-transitory machine-readable storage medium storing instructions, characterized in that: When the instructions are executed by a computer, the computer is caused to perform the method according to any one of claims 1 to 7.

16. A chip, characterized in that: include: The processor is configured to call and run a computer program stored in the memory so that a device equipped with the chip executes the method according to any one of claims 1 to 7.

17. A computer-readable storage medium, characterized in that: A computer program is stored, wherein the computer program causes a computer to execute the method according to any one of claims 1 to 7.

18. A computer program product, characterized in that A computer program is included, wherein the computer program causes a computer to execute the method as claimed in any one of claims 1 to 7.

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