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 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 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 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. 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 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.

Abstract: Embodiments of the present disclosure relate to methods and apparatuses of synchronization signal transmission and receiving in a wireless communication system. The method of synchronization signal transmission in a wireless communication system may comprise transmitting a signal set containing one or more synchronization signals, wherein the one or more synchronization signals are transmitted in a predetermined signal transmission pattern within a signal transmission period, and wherein the predetermined signal transmission pattern indicates information on synchronization signal transmission. With embodiments of the present disclosure, it may indicate the information on synchronization signal transmission information by means of the signal transmission mode. Thus, especially for an initial access process, it can provide a common frame for both single beam based deployment and multi-beam based deployment.

Abstract: Embodiments of the present disclosure provide a solution for CSI reporting. In a method for communication, a terminal device receives one or more configurations for at least one of a first Channel State Information (CSI), a second CSI or a third CSI in a CSI reporting setting. The one or more configurations in the CSI reporting setting include at least one of at least two rank restrictions or at least two codebook subset restrictions (CBSRs). The terminal device transmits, to a network device, at least one of the first CSI, the second CSI or the third CSI based on the one or more configurations.

Abstract: Embodiments of the present disclosure relate to methods and devices for data transmission. In example embodiments, a method implemented in a network device is provided. According to the method, a target RS port group is determined from a plurality of RS ports for transmitting a RS. The RS ports are associated with at least one network device. Then, a configuration of the target RS port group is transmitted to the terminal device.

Abstract: Embodiments of the present disclosure relate to methods, devices and computer readable media for communication. A terminal device receives, from a network device, a first timing value set associated with a first HARQ feedback with a first priority, a second timing value set associated with a second HARQ feedback with a second priority different from the first priority, and a TDRA list for the first and second HARQ feedbacks, determines a third timing value set from the first and second timing value sets, constructs a HARQ codebook comprising the first and second HARQ feedbacks at least based on the third timing value set and the TDRA list, and transmits the HARQ codebook to the network device on an uplink control channel. In this way, unnecessary redundancy in HARQ bits can be removed and UCI overhead can be reduced.

Abstract: Embodiments of the present disclosure relate to methods, terminal device, network device and apparatuses for determining a Phase Tracking Reference Signal (PTRS) configuration parameter. In an embodiment of the present disclosure, the method of interference measurement comprises determining a PTRS transmission resource configuration parameter based on a resource allocation type to be used in data transmission. With embodiments of the present disclosure, it may determine different PTRS configuration parameters for different resource allocation types, and thus provide a more suitable PTRS configuration solution for different resource allocation cases.

Abstract: Embodiments of the present disclosure provide methods, apparatuses and computer program for signal configuration in a wireless communication system. A method implemented at a network device comprises: transmitting information related to a resource allocation for a signal, and broadcasting the signal in accordance with the resource allocation; wherein the signal includes at least one of: a reference signal and a control signal containing system information. By virtue of the method, resource utilization may be more flexibly controlled.