Abstract: Embodiments of the disclosure provide a method and device for performing communication. The method comprises: determining a target transmission pattern from a set of candidate transmission patterns, wherein each of the candidate transmission patterns contains a DL transmission part and/or a UL transmission part, and the candidate transmission patterns differ from one another in terms of time durations of the respective DL transmission parts and/or the UL transmission parts; and performing communication between a network device and a terminal device by using the target transmission pattern.

Abstract: Embodiments of the present disclosure relate to a method and apparatus of transmitting a reference signal and a method and apparatus of receiving a reference signal. In one embodiment of the present disclosure, the method of transmitting a reference comprises receiving a reference signal configuration indication, wherein reference signal resources are divided into at least two reference signal groups, and the reference signal configuration indication indicates a reference signal configuration including a reference signal group configuration; and transmitting the reference signal using a reference signal sequence in a reference signal group as indicated by the reference signal group configuration, wherein the reference signal sequence can be multiplexed with another layer or another user in different reference signal groups.

Abstract: Embodiments of the present disclosure relate to methods and devices for reference signal (RS) transmission. In example embodiments, a method implemented in a network device is provided. According to the method, one or more RS patterns are determined for a plurality of RS ports. A RS pattern indicates a configuration of a RS to be transmitted to a terminal device via one or more RS ports. Afterwards, information of the RS patterns is transmitted to the terminal device.

Abstract: Embodiments of the present disclosure relate to a method, device and computer readable storage medium of communication. The method comprises receiving at a terminal device a DCI for scheduling at least one PUSCH transmission from a network device. The DCI comprises a first field indicating that the at least one PUSCH transmission is to be transmitted based on a SRS resource set from a plurality of SRS resource sets or the plurality of SRS resource sets, and a second field indicating an index of the single SRS resource set for transmitting the at least one PUSCH transmission. The method further comprises transmitting, by the terminal device, the at least one PUSCH transmission based on the DCI to the network device. In this way, when supporting dynamic switching between single-TRP transmission and multi-TRP transmission, the newly-introduced overhead may be minimized.

Abstract: Embodiments of the present disclosure provide method, device and computer readable medium for multi-TRP transmission. In example embodiments, a method implemented at a terminal device is provided. The method comprises, in response to a first bandwidth part (BWP) being configured for first and second Transmission and Reception Points (TRPs) in communication with the terminal device and different Physical Downlink Control Channels (PDCCHs) being configured for the first and second TRPs, receiving, from the first TRP, a first PDCCH in a first slot. The method further comprises, in response to the first PDCCH indicating BWP switching from the first BWP to a second BWP on the first TRP, ensuring BWPs on the first and second TRPs to be aligned. In this way, BWPs for multiple TRPs can be aligned in multi-PDCCH based multi-TRP transmission.

Abstract: Embodiments of the present disclosure relate to methods, devices and computer readable media for DMRS transmission. A method implemented at a terminal device comprises selecting, from a plurality of computer generated (CG) sequences, a CG sequence for an uplink channel modulated with a predetermined modulation technique. The method further comprises generating, based on the selected CG sequence, a DMRS sequence for the uplink channel. In addition, the method further comprises transmitting, over the uplink channel, the DMRS sequence to a network device. The embodiments of the present disclosure can provide a set of candidate CG sequences with low PAPR, good autocorrelation performance and good cross-correlation performance for generating DMRS sequences for ?/2-BPSK modulated PUSCH or PUCCH.

Abstract: Embodiments of the present disclosure relate to a method, network device, and apparatus for transmitting a preemption indication and a method, terminal device, and apparatus for receiving a preemption indication. In an embodiment of the present disclosure, the method of transmitting a preemption indication may comprise transmitting a preemption indication to a terminal device, wherein the preemption indication indicates information on a portion of resources allocated to a first transmission which is preempted by a second transmission, and wherein the preemption indication is associated with information on structure of the current slot. In embodiments of the present disclosure, by means of information on structure of a subframe, the indication monitoring and overhead for the preemption indication can be reduced remarkably, thereby providing a much more efficient preemption indication solution.

Abstract: Embodiments of the present disclosure relate to methods and apparatuses for Reference Signal (RS) transmission. In example embodiments, a method implemented in a network device is provided. According to the method, the network device determines at least one set of CSI-RS resources for transmitting Tracking Reference Signal (TRS) to a terminal device. The network device further determines a first offset between a first slot to transmit a first signal for enabling transmission of the TRS and a second slot to transmit the TRS in the at least one set of CSI-RS resources. The first offset is different from a second offset between a third slot to transmit a second signal for enabling transmission of CSI-RS and a fourth slot to transmit the CSI-RS. The network device transmits a configuration indicating the at least one set of CSI-RS resources and the first offset to the terminal device.

Abstract: Embodiments of the present disclosure relate to methods, devices and computer storage media for communication. According to embodiments of the present disclosure, a downlink control information (DCI) indicating a transmission configuration indication (TCI) state is transmitted from a network device to a terminal device. The terminal device applies, based on a first association, the TCI state for receiving a physical downlink shared channel (PDSCH) which is scheduled by the DCI from the network device. The terminal device applies, based on a time threshold and a second association, the TCI state for receiving a physical downlink control channel (PDCCH) transmitted from the network device. As such, a common beam used for PDCCH and PDSCH, which is indicated by a common TCI state, can be updated and the updated beam can be applied for PDCCH and PDSCH transmission/reception in case of multi-TRP transmission.

Abstract: Embodiments of the present disclosure relate to methods, devices and computer storage media for communication. A method comprises receiving, at a terminal device, a configuration from a network device, wherein the configuration indicates that each of a group of cells serving the terminal device is associated with at least one of a plurality of transmission and reception points (TRPs) coupled with the network device; and in response to a beam failure being detected on a cell in the group of cells, transmitting a beam failure recovery request to the network device, wherein the beam failure recovery request comprises TRP information related to the beam failure detected on the cell.

Abstract: Embodiments of the present disclosure relate to methods, devices and computer storage media for communication. A method comprises transmitting, from a network device to a terminal device, a set of repetitions of downlink control information (DCI) for scheduling data transmissions from the network device to the terminal device; performing, based on the set of repetitions of the DCI, the data transmissions from the network device to the terminal device; and receiving, from the terminal device, a single feedback signal for the data transmissions. Embodiments of the present disclosure can improve reliability and robustness for Physical Downlink Control Channel (PDCCH).

Abstract: Embodiments of the present disclosure relate to methods, devices and computer readable media for communication. A method comprises determining, at a first device, a first parameter for determination of a sequence group index based on at least one of the following: a second parameter indicating an identity associated with a physical channel between the first device and a second device, a third parameter indicating a scrambling identity, and a fourth parameter indicating a cell identity; determining the sequence group index based on the first parameter; generating, at least based on the sequence group index, a Demodulation Reference Signal (DMRS) sequence to be transmitted to the second device; and transmitting the generated DMRS sequence to the second device over the physical channel. Embodiments of the present disclosure can enable DMRS transmission with low Peak to Average Power Ratio (PAPR) and high flexibility.

Abstract: Embodiments of the present disclosure relate to methods, devices and computer storage media for communication. According to embodiments of the present disclosure, a first downlink control information (DCI) with an indication of a first transmission configuration indicator (TCI) state and a second DCI with an indication of a second TCI state are received by a terminal device. A hybrid automatic repeat request acknowledge (HARQ-ACK) codebook corresponding to the reception, is transmitted to the network device. At least one of a first physical downlink control channel (PDCCH) and a first physical downlink shared channel (PDSCH) with one of the first TCI state and the second TCI state is received after a timing based on an information of the HARQ-ACK codebook.

Abstract: Embodiments of the present disclosure relate to the communication processes in a wireless communication system based on short TTIs. According to one embodiment of the present disclosure, there provide a method for communication by a base station. The method comprise: receiving, from a user equipment, an uplink demodulation reference signal, DMRS, in an uplink transmission time interval, TTI, of an uplink subframe, which supports two or more uplink TTIs. At least one uplink TTI supported by the uplink subframe is configured to only transmit uplink control information and/or uplink data without any uplink DMRS. In the other aspects of the present disclosure, there also provides methods for communication by a user equipment and corresponding apparatuses.

Abstract: Embodiments of the present disclosure relate to methods, devices and computer storage media for communication. A method comprises monitoring, at a terminal device, a first Physical Downlink Control Channel (PDCCH) candidate and a second PDCCH candidate, wherein the first PDCCH candidate and the second PDCCH candidate are linked for PDCCH repetition. The method further comprises in response to a predetermined condition being satisfied, detecting, from at least one of the first and second PDCCH candidates, downlink control information (DCI) comprising a bandwidth part (BWP) indicator field indicating an active BWP change.

Abstract: Embodiments of the present disclosure relate to methods, devices and computer readable media for communication of a RS. According to embodiments of the present disclosure, the terminal device receives information indicating a set of resources for transmitting a reference signal from the network device. If the terminal device receives an indication in a first slot for triggering a transmission of the reference signal, the terminal device determines a second slot for transmitting the reference signal. The terminal device determines whether the second slot is valid based on a slot configuration. In this way, it can avoid the SRS transmission timing ambiguous or misalignment between terminal device and network.

Abstract: Embodiments of the present disclosure provide method, device and computer readable medium for beam failure recovery. In example embodiments, a method implemented at a terminal device is provided. The method comprises determining a configuration for receiving Physical Downlink Control Channels (PDCCHs) from a network device, the network device communicating with the terminal device via first and second Transmission and Reception Points (TRPs), wherein the configuration indicates which one of the first and second TRPs are the PDCCHs to be received from. The method further comprises determining whether a beam failure occurs in at least one of the first and second TRPs. In addition, the method further comprises, in response to determining that a beam failure occurs in at least one of the first and second TRPs, performing beam failure recovery (BFR) for the first and second TRPs at least based on the configuration.

Abstract: Embodiments of the present disclosure relate to methods, devices and computer readable media of communication. A terminal device receives, from a network device, a scheduling for a set of PUSCH transmissions in DCI, determines a first subset of SRS resources in a first SRS resource set and a second subset of SRS resources in a second SRS resource set, at most one of the first subset of SRS resources and the second subset of SRS resources comprising no SRS resource, and transmit, to a network device, the set of PUSCH transmissions based on the at least one of the first subset of SRS resources and the second subset of SRS resources. In this way, single DCI based multi-TRP PUSCH repetition scheme is provided with reduced overhead and increased flexibility.

Abstract: Embodiments of the present disclosure relate to methods, devices and computer storage media for communication. A method comprises receiving, at a terminal device, at least one configuration about a first control resource set (CORESET) and a second CORESET, wherein the at least one configuration indicates that the first CORESET is associated with a first set of reference signals (RSs) for beam failure detection (BFD), and the second CORESET is associated with the first set of RSs or a second set of RSs for BFD; and monitoring at least one PDCCH candidate based on detection of a beam failure with assessing radio link quality over at least one of the first set of RSs and the second set of RSs. As such, some meaningless blind detection for PDCCH can be avoided, so as to increase the efficiency of PDCCH detection.

Abstract: Embodiments of the present disclosure relate to methods and an apparatuses for synchronization signal (SS) transmission. In example embodiments, a method implemented in a network device is provided. According to the method, information on a plurality of SS blocks to be transmitted by the network device is determined based on at least one of a frequency range and a value of subcarrier spacing. The information at least in part indicates timing for transmitting the plurality of SS blocks The plurality of SS blocks are transmitted to at least one terminal device based on the determined information.