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, devices and computer readable media for Reference Signal (RS) transmission. A method for communication comprises determining one or more RS ports for RS transmission, the one or more RS ports being included in one or more RS groups. The method further comprises determining a plurality of parameters for generating a RS sequence specific to a RS group in the one or more RS groups, the RS group including at least one of the one or more RS ports. The method further comprises generating the RS sequence based on the plurality of parameters. In addition, the method further comprises transmitting the generated RS sequence over the at least one of the one or more RS ports. The embodiments of the present disclosure can solve the PAPR issue caused by mapping a same RS sequence to antenna ports across RS port 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 methods and devices for timing advance adjustment. In example embodiments, a method implemented in a network device is provided. According to the method, in response to receiving a Physical Random Access Channel (PRACH) sequence from a terminal device served by the network device, a first value indicating an adjustment of timing advance is determined based on the PRACH sequence and at least one value of subcarrier spacing. An indication of the first value is transmitted to the terminal device to enable the terminal device to adjust timing of uplink transmission.

Abstract: Embodiments of the present disclosure relate to a method and apparatus of transmitting uplink (UL) information and a method and apparatus of receiving UL information. In one embodiment of the present disclosure, the method of transmitting UL information comprises transmitting a reference signal using a first sequence; and transmitting UL control information using a second sequence; wherein a reference signal and the UL control information are staggered-multiplexed in frequency domain. With embodiments of the present disclosure, the uplink information can be transmitted in reduced uplink symbols so as to adapt for a proposed subframe structure with reduced uplink symbols and thus, the transmission latency can be reduced greatly.

Abstract: Embodiments of the present disclosure provide methods, devices and computer readable media for multi-TRP transmission. According to a method for communication, a terminal device receives downlink control information (DCI) from at least one of a plurality of network devices in communication with the terminal device, each of the plurality of network devices having a different demodulation reference signal (DMRS) group comprising a plurality of DMRS ports for transmitting DMRSs. The terminal device determines, from the DCI, respective transmission configuration indication (TCI) states for DMRS groups of the plurality of network devices and DMRS ports for receiving DMRSs transmitted by the plurality of network devices. The terminal device receives the DMRSs from the plurality of network devices on the DMRS ports based on the TCI states. The embodiments of the present disclosure provide solution of multi-TRP communication with reduced overhead.

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, the size of a field for indicating a RS configuration to a terminal device served by the network device is determined based on at least one condition related to RS transmission. A first indication of the RS configuration is transmitted to the terminal device. The first indication is included in the field with the determined size.

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 mediums for timing adjustment. In example embodiments, a method implemented at a terminal device is provided. The method comprises, in response to a network device providing a serving cell to serve the terminal device and the serving cell being configured with at least a first procedure for adjusting timing of uplink transmissions and a second procedure for adjusting timing of uplink transmissions, determining, from the first and second procedures, at least one procedure to be applied to an uplink transmission. The method further comprises determining at least one timing advance (TA) value for the at least one procedure. In addition, the method further comprises applying the at least one procedure to the uplink transmission by adjusting the timing of the uplink transmission based on the at least one TA value.

Abstract: Embodiments of the present disclosure relate to methods, devices and computer readable mediums for uplink transmission. In example embodiments, a method implemented at a terminal device is provided. The method comprises, in response to being configured with at least one SRS resource set by a network device and the at least one SRS resource set being associated with first and second CSI-RS resources, receiving, from the network device, a first CSI-RS transmitted via a first TRP over the first CSI-RS resource and a second CSI-RS transmitted via a second TRP over the second CSI-RS resource. The method further comprises determining, based on the received first and second CSI-RSs, first precoding information for uplink transmission via the first TRP and second precoding information for uplink transmission via the second TRP respectively.

Abstract: Embodiments of the present disclosure relates to the communication processes in a FDD 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: transmitting, to a user equipment, downlink control information in a downlink TTI of a mth downlink subframe which supports two or more downlink TTIs; and receiving, from the user equipment, uplink data scheduled by the downlink control information carried in a mth or (m+1)th uplink subframe which supports two or more uplink TTIs. The downlink control information transmitted in at least one of downlink TTIs supported by downlink subframes is arranged to schedule uplink data transmission in at least two of uplink TTIs supported by uplink subframes. 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 readable mediums for reducing channel state information (CSI) feedback overhead. In example embodiments, a method implemented at a terminal device comprises receiving a codebook configuration and a reference signal from a network device the codebook configuration indicating at least one codebook subset restriction (CBSR); determining, based on reference signal at least one precoding matrix indicator (PMI) associated with a plurality of beams of a set of beams between the terminal device and the network device selected at least partially based on the at least one CBSR; and transmitting the at least one PMI to the network device.

Abstract: Embodiments of the disclosure provide a method and device for indicating numerology. The method comprises: determining numerology information of a carrier, the numerology information indicating numerologies of one or more basic units for the carrier; and transmitting the numerology information to a terminal device to enable reception based on the numerology information.

Abstract: Embodiments of the present disclosure provide a method, a device and a computer readable medium for communication based on a multi-TRP codebook. According to a method for communication, a terminal device measures downlink channel conditions related to a plurality of network devices in communication with the terminal device. The terminal device selects a precoding matrix from a codebook based on the downlink channel conditions, elements in a column of the codebook represent respective beam sets for the plurality of network devices, and the precoding matrix indicates respective beams for the plurality of network devices. The terminal device transmits an index of the precoding matrix to at least one of the plurality of network devices. The embodiments of the present disclosure enable multi-TRP PMI feedback based on the proposed multi-TRP codebook.

Abstract: Embodiments of the disclosure provide a method and device for cross-numerology scheduling. The method comprises: determining at least one of a first time position associated with a first communication and a time interval between the first communication and a second communication, the first communication using a first numerology, the second communication using a second numerology and being performed in response to the first communication.

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.

Abstract: Embodiments of the present disclosure relate to methods, devices and apparatuses of channel state information (CSI) reporting for multiple reception point (TRP) transmission. In an embodiment of the present disclosure, a method may include transmitting a first CSI report on a first TRP of multiple TRPs serving a terminal device for a channel state information reference signal (CSI-RS) resource set for CSI acquisition. The method may further include transmitting a second CSI report on a second TRP of the multiple TRPs serving the terminal device for the CSI-RS resource set. With embodiments of the present disclosure, it is possible to support CSI reporting for multiple TRP transmission.

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.

Abstract: Embodiments of the present disclosure relate to a method, device and apparatus for Channel State Information (CSI) measurement and a method, device and apparatus for transmitting a CSI reference signal. In an embodiment of the present disclosure, a CSI-RS resource configuration is received from a network device, the CSI-RS resource configuration indicating a CSI-RS resource set including a plurality of CSI-RS resources. CSI measurement is then performed using one of a plurality of CSI-RS resource combinations, wherein the plurality of CSI-RS resource combinations being determined from the CSI-RS resource set based on a predefined combination rule. With embodiments of the present disclosure, it is possible to support CSI measurement for a multiple TPR/multiple panel transmission.

Abstract: Embodiments of the present disclosure relate to a method and apparatus of transmitting uplink (UL) information and a method and apparatus of receiving UL information. In one embodiment of the present disclosure, the method of transmitting UL information comprises transmitting a reference signal using a first sequence; and transmitting UL control information using a second sequence; wherein a reference signal and the UL control information are staggered-multiplexed in frequency domain. With embodiments of the present disclosure, the uplink information can be transmitted in reduced uplink symbols so as to adapt for a proposed subframe structure with reduced uplink symbols and thus, the transmission latency can be reduced greatly.