Abstract: Embodiments of the present disclosure relate to methods, devices and computer readable media for communication. A terminal device determines CSI based on a measurement on a set of RSs from a network device, and determines a compression method based on a configuration from the network device. The terminal device compresses the CSI based on the compression method, and transmits, to the network device, the compressed CSI. The network device determines the compression method applied for the compressed CSI based on the configuration, and recoveries CSI based on the compressed CSI and the compression method. In this way, CSI feedback overhead and compression performance may be balanced.

Abstract: Embodiments of the present disclosure relate to methods, devices and computer storage media for communication. The method comprises receiving, at a terminal device and from a network device, a configuration of Channel State Information, CSI, report at least indicating information related to at least one of: a collection procedure of the network device for collecting one or more CSI reports collected from the terminal device; or an inference procedure of the network device for inferencing one or more CSI based on the collected one or more CSI reports; and transmitting the CSI report based on the information, wherein the CSI report comprises at least one of a periodic CSI report, a semi-persistent CSI report and a first type of CSI report.

Abstract: Embodiments of the present disclosure relate to communications. According to embodiments of the present disclosure, a network device transmits at least one configuration associated with precoding matrix to a terminal device. The network device also transmits downlink control information (DCI) for scheduling a physical uplink shared channel (PUSCH) to the terminal device. The DCI comprises an indication of a precoding matrix index. The terminal device determines a precoding matrix based on the at least one configuration and the indication. The terminal device transmits the PUSCH based on the precoding matrix. In this way, the precoding matrix can be selected properly.

Abstract: Embodiments of the present disclosure relate to method, device and computer readable medium of communication. A terminal device deployed with first and second sets of antenna ports receives DCI for scheduling an uplink transmission, the DCI comprising a first SRI and a second SRI. The terminal device determines a first set of antenna port indexes based on a first number of layers of the uplink transmission indicated by the first SRI and indexes of SRS resources in a first set of SRS resources, and determines a second set of antenna port indexes based on indexes of SRS resources in a second set of SRS resources, a second number of layers of the uplink transmission indicated by the second SRI and the number of SRS resources in the first set of SRS resources. Then the terminal device performs the uplink transmission over antenna ports corresponding to the first and second sets of antenna port indexes. In this way, a simultaneous transmission across multi-panels is well supported.

Abstract: Embodiments of the present disclosure relate to methods, devices, and computer readable medium for communication. According to embodiments of the present disclosure, a first terminal device transmits a set of reference signals to a second terminal device on a set of reference signal resources based on a reference signal configuration. The reference signal configuration at least indicates an association between a first transmission of a first reference signal and a second transmission of a last reference signal in the set of reference signals. The second terminal device transmits a measurement report for a reference signal in the set of reference signals on a sidelink resource. The sidelink resource is associated with a reference signal resource on which the reference signal is transmitted.

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 readable media of communication. A terminal device receives, from a network device, a first indication indicating a set of TCI states for a CORESET and determines whether a BFR procedure is to be performed in application time associated with at least one TCI state in the set of TCI states. If no BFR procedure is to be performed, the terminal device stops the BFR procedure in the application time associated with the at least one TCI state. If the BFR procedure is to be performed, the terminal device performs the BFR procedure in the application time associated with the at least one TCI state. In this way, management of a BFR procedure based on beam prediction may be achieved.

Abstract: Embodiments of the present disclosure relate to methods, devices, and computer readable medium for communication. According to some embodiments, in accordance with a determination that beam failure is detected for all of a plurality of beam failure detection-reference signal (BFD-RS) sets on a cell, initiating, with a network device in the cell, a random access (RA) procedure on the cell; and in accordance with a determination that the RA procedure is successfully completed, cancelling a plurality of beam failure recovery (BFR) procedures triggered for the plurality of BFD-RS sets on the cell.

Abstract: Embodiments of the present disclosure provide a solution for. In a method for communication, a terminal device receives, from a network device, control information indicating a set of resources and transmission configuration indicator (TCI) states for a communication between the terminal device and the network device. The terminal device determines resource subsets associated with the respective TCI states, each resource subset being a part of the set of resources in frequency domain. The terminal device determines a mapping of phase-tracking reference signals (PT-RSs) to the resource subsets. Embodiments of the present disclosure provide practical details on how to decide PT-RS presence/density/pattern/offset if a scheduled set of resources are shared by a plurality of TCI states, especially in case of scheme 2a/2b.

Abstract: Embodiments of the present disclosure relate to methods, devices, and computer readable medium for communication. According to embodiments of the present disclosure, a terminal device receives a measurement configuration or transmission configuration from a network device. The terminal device performs a measurement based on the measurement configuration and report results of the measurement to the network device. Alternatively, if the terminal device performs transmissions based on the transmission configuration, the network device performs a measurement based on the transmissions. The network device trains an intelligent (AI) or machine learning (ML) based on the results of the measurement. In this way, the real measurement results are used for constructing a suitable dataset for the AI or ML model at the network device.

Abstract: Embodiments of the present disclosure relate to methods, devices, and computer readable medium for communication. According to embodiments of the present disclosure, a first network device receives a plurality of SSB signals from a second network device in a plurality of periods. The first network device transmits the plurality of SSB signals by a first network device via a plurality of first beams towards respective directions. A first beam for transmitting the plurality of SSB signals is changed per period, and random access resources correspond to the plurality of SSB signals being associated with the plurality of periods. The first network device receives, from a terminal device, a random access signal on one of the random access resources associated with a corresponding one of the plurality of periods. The first network device transmits the random access signal to the second network device. In this way, the beam determination procedure for the link between the repeater and the UE can be facilitated.

Abstract: Example embodiments of the present disclosure relate to an effective mechanism for handing the scenario of discontinuous coverage. In this solution, the terminal device generates at least one beam report based on an active transmission configuration indicator (TCI) state of the terminal device, where the terminal device is configured with at least one of a serving cell associated with a first physical cell identity (PCI) and a neighbor cell associated with a second PCI. The terminal device further transmits the at least one beam measurement report in the serving cell or in the neighbor cell. In this way, the number of reporting the useless and unnecessary measurements result is reduced.

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 first configuration information transmitted on a first cell, wherein the first configuration information includes a set of TCI states, and the set of TCI states is associated with a second cell different from the first cell. The terminal device receives a first activation command to activate one or more TCI states, wherein the one or more TCI states comprise at least one TCI state from the set of TCI states. The terminal device applies the one or more activated TCI states from a first slot after a predefined timing. In this way, a beam for the second cell can be indicated according to the TCI state indicated by the first cell before serving cell change; accordingly, the latency, the overhead and the interruption time during the inter-cell mobility can be reduced.

Abstract: Embodiments of the present disclosure relate to methods, devices, and computer readable medium for communication. According to some embodiments, a method comprises determining, at a terminal device, that a negative acknowledgment (NACK) feedback is to be transmitted for at least one of a set of transport blocks (TBs) transmitted from a network device; selecting, from a mapping table associated with the set of TBs, a cyclic shift value mapped to a combination of the at least one TB; generating a sequence at least based on the selected cyclic shift value; and transmitting, to the network device, the NACK feedback for the at least one TB using the generated sequence.

Abstract: Example embodiments of the present disclosure relate to an effective mechanism for reference signal (RS) configuration. In this solution, the terminal device determines at least one cyclic shift (CS) for an SRS transmission with four antenna ports, the at least one CS comprising: at least one first CS and at least one second CS, where the at least one second CS is different from the at least one first CS. Further, the terminal device transmits, to a network device and based on the at least one first CS and the at least one second CS, the SRS transmission over a comb-structure resource with a comb value of eight. In this way, the peak to average power ratio (PAPR) performance is improved.

Abstract: Embodiments of the present disclosure relate to methods, devices and computer readable mediums for beam management. In example embodiments, a method implemented at a first network device is provided. According to the method, a first group of resources are determined to be used by a terminal device for determining a first group of beams from the first network device. The first group of resources are different from a second group of resources configured by a second network device to the terminal device for determining a second group of beams from the second network device. The first group of resources are configured to the terminal device. A plurality of synchronization and/or reference signals are transmitted, using the first group of beams, on the first group of resources to the terminal device.

Abstract: Embodiments of the present disclosure relate to methods, devices and computer storage media for communication. A method comprises transmitting, from a first device to a second device, a plurality of repetitions for a physical channel for scheduling a communication between the first device and the second device, wherein the plurality of PDCCH repetitions indicate same offset information for the communication; determining, based on the same offset information and index information about a repetition of the plurality of repetitions, a time offset between the repetition and the communication; and performing, based on the time offset, the communication with the second device. Embodiments of the present disclosure enable both the network device and the terminal device to obtain, from the physical channel repetitions, the real time offset for a corresponding communication and improve reliability and robustness for the physical channel.

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 relate to methods, devices and computer storage media for communication. According to embodiments of the present disclosure, a terminal device transmits, to a network device, a first hybrid automatic repeat request acknowledgement (HARQ-ACK) information corresponding to a first downlink control information (DCI) in a first physical downlink control channel (PDCCH), wherein the first DCI indicates a first transmission configuration indicator (TCI) state. If a condition is fulfilled, the terminal device applies the first TCI state. In this way, the terminal device understands when and/or whether to apply the indicated TCI state.

Abstract: A method at a base station for performing data transmission to a user equipment in a communications system supporting carrier aggregation of at least one first carrier on which a short TTI is applied and at least one second carrier on which a long TTI is applied. The method transmits at least one DL scheduling grant corresponding to data transmission to the user equipment in a DL control region of at least one of a short TTI on a first carrier and a long TTI on a second carrier and performs DL data transmission towards the user equipment in a data transmission region of a short TTI on the first carrier and in the data transmission region of a long TTI on the second carrier as indicated by the at least one DL scheduling grant.