Abstract: Disclosed are example embodiments of methods, apparatuses and systems supporting beam diversity for multimedia broadcast multicast services. A method may comprise receiving information of one or more beams and abeam-specific repetition pattern for at least one of the one or more beams for transmission of a service from a network device, and receiving the service on the at least one of the one or more beams based on the beam-specific repetition pattern.

Abstract: Example embodiments of the present disclosure relate to devices, methods, apparatuses and computer readable storage media for semi-static scheduling of multicast broadcast service traffic. In example embodiments, at least one of enabling, disabling or modification of a semi-persistent scheduling configuration is determined for a group of devices on a bandwidth part for multicast broadcast service traffic. The at least one of enabling, disabling or modification of the semi-persistent scheduling configuration is indicated to the group of devices.

Abstract: Example embodiments of the present disclosure relate to semi-static HARQ-ACK codebook construction for frequency-multiplexed DL data transmission. A first device includes at least one processor; and at least one memory including computer program codes; wherein the at least one memory and the computer program codes are configured to, with the at least one processor, cause the first device to: receive downlink configuration information from a second device, receive at least two frequency-multiplexed downlink transmissions at one downlink data transmission occasion, and set, based on the downlink configuration information and an error state of the frequency-multiplexed downlink data transmissions, an acknowledgment indication in a semi-static HARQ-ACK codebook to be transmitted to the second device for the downlink data transmission occasion.

Abstract: This disclosure presents methods and processes to allow a user equipment (UE) to map a hybrid automatic retransmission request-acknowledgement (HARQ-ACK) feedback to one or more HARQ-ACK sub-codebooks for received services. The one or more HARQ-ACK sub-codebooks can be concatenated into one HARQ-ACK codebook and then communicated to a communication node, when those services use a HARQ-ACK feedback that is scheduled for the same time instance. Various methods can be used for the concatenation order depending on the number of multicast and broadcast services (MBS) for which HARQ feedback is to be provided, and depending on whether HARQ-ACK feedback is to be sent for unicast services at the scheduled time instance. The concatenation order can utilize an increasing order or a decreasing order of the concatenation order parameters.

Abstract: Embodiments of the present disclosure relate to frequency domain resource allocation for multicast traffic. A method comprises: receiving, at a first device and from a core network element, multicast traffic to be scheduled for a second device; generating assistance information for the second device, the assistance information enabling the second device to identify, within a bandwidth part configured for the second device, a frequency domain resource allocated for the multicast traffic; and transmitting the assistance GC information to the second device. The method further comprises: receiving, at the second device, the assistance information from a first device; and determining the frequency domain resource from downlink control information based on the assistance information. In this way, a significant flexibility to schedule multicast traffic can be provided, and a significant complexity reduction to a terminal device can be provided.

Abstract: Embodiments of the present disclosure relate to methods, apparatuses and computer readable storage media for search space configuration for multicast traffic. According to embodiments of the present disclosure, a first device determines, from a group of search space sets configured to the first device, at least one search space set for monitoring multicast traffic from a second device, based on at least one of a priority of the multicast traffic and respective types of the search space sets. The first device monitors the multicast traffic from the second device in the at least one search space set. The solution enables multicast traffic to be monitored in a common search space set, a user-specific search space set or a multicast search space set in different scenarios.

Abstract: Embodiments of the present disclosure relate to methods, apparatuses and computer readable storage media for channel state information (CSI) reporting. According to embodiments of the present disclosure, a first device receives from a second device a configuration for CSI reporting. The configuration comprises at least a block error rate target and an indication of a number of HARQ transmissions. The first device determines Channel Quality Indicator (CQI) based on the block error rate target and the number of HARQ transmissions indicated by the configuration and transmits a CSI report comprising the CQI to the second device. The solution enables CSI feedback that is suitable for spectrally efficient and reliable delivery of Point to Multipoint services while meeting the delay requirement, in particular in the context of NACK-only feedback on common feedback resources.

Abstract: Embodiments of the present disclosure relate to downlink control and data channel configuration. A method comprises: determining, at a first device, a transmission scheme of control information for a second device based on at least one multicast and broadcast service related criterion, the control information related to scheduling multicast service traffic to the second device; transmitting, to the second device, configuration information for causing the second device to obtain the control information; and transmitting, to the second device and based on the determined transmission scheme, the control information on a control channel between the first device and the second device. In this way, the correlation between the scheduling mechanism of multicast traffic on the downlink data channel and the transmission mechanism of control information on the downlink control channel can be decoupled, resulting in a flexible and dynamic downlink channel configuration and an increased radio resource efficiency.

Abstract: Embodiments of the present disclosure relate to time domain resource allocation for multicast broadcast service. A first device receives, from a second device, DCI comprising a TDRA field, and determines, based on at least one of an identifier for scrambling the DCI, a RRC state of the first device or a type of traffic configured for the first device, a TDRA list from a set of configurations for TDRA. Then the first device applies, based on the TDRA list, the TDRA field for reception of the traffic from the second device. In this way, a TDRA list to be used may be determined in an optimal manner, with all terminal devices receiving multicast and broadcast traffic determining common values for time domain resources where data traffic would be scheduled.

Abstract: Embodiments of the present disclosure relates to estimating downlink size for a multicast traffic. According to embodiments of the present disclosure, a first device receives downlink control information (DCI) for a multicast traffic. The first device determines field size(s) in the DCI based on one or more parameters which are associated with the field size estimation for the multicast traffic. The first device decodes the DCI based on the determined field sizes(s). In this way, the DCI can be blindly decoded correctly.

Abstract: A method comprises receiving a reference signal from a first node, estimating channel information from said received reference signal, and causing a signal to be transmitted to said first node, said signal comprising a reference signal and information dependent on said channel information.

Abstract: A technique including determining that a first access node serving a communication device is currently in a dormant, first state in which said first access node is not receiving radio transmissions; and controlling a radio transmitter or radio transceiver at said communication device to transmit a radio signal that triggers at least one second access node to alert said first access node of a request for said first access node to switch from said first state to a second state in which said first access node receives radio transmissions.

Abstract: A method for network synchronization of a first network element is provided, comprising: receiving, from each of at least two synchronization candidate network elements, a first synchronization accuracy value; determining, for each of the at least two synchronization candidate network elements, a signal quality indicator; determining for each synchronization candidate network element a second synchronization accuracy value based on the signal quality indicator and the first synchronization accuracy value related to the synchronization candidate network element, and selecting a synchronizing network element, for synchronizing the first network element to, from the at least two synchronization candidate network elements, based on the determined second synchronization accuracy values. The present disclosure enhances the performance of RIB network synchronization by indicating an estimate of an accumulated synchronization error magnitude.

Abstract: There is provided a method comprising configuring at least one physical resource block of a first transmission time interval, comprising determining allocation of resource elements of the at least one physical resource block to at least one resource element group per physical resource block or per virtual resource block.

Abstract: A method and an apparatus for transmitting Hybrid Automatic Repeat reQuest (HARQ) indication information are provided. The method includes transmitting, by a UE, uplink data on a Physical Uplink Shared CHannel (PUSCH) according to scheduling of a base station; detecting, by the UE, a new UpLink (UL) grant and enhanced Physical HARQ Indication CHannel (ePHICH) information of the base station for the uplink data according to a synchronous HARQ timing relationship, wherein ePHICH resources used for bearing the ePHICH information are mapped to a portion of time-frequency resources of a distributed enhanced Physical Downlink Control CHannel (ePDCCH) set; and if the UL grant is not detected, the UE retransmitting the uplink data or not transmitting the uplink data according to an indication of the ePHICH information.

Abstract: A method comprises receiving a reference signal from a first node, estimating channel information from said received reference signal, and causing a signal to be transmitted to said first node, said signal comprising a reference signal and information dependent on said channel information.

Abstract: A method comprising: sending information from a first node to a second node, said first node comprised in a first layer and said second node comprised in a second layer of a layered network, receiving at said first node channel information from said second node; and using said channel information for antenna calibration at said first node.

Abstract: A method for network synchronization of a first network element is provided, comprising: receiving, from each of at least two synchronization candidate network elements, a first synchronization accuracy value; determining, for each of the at least two synchronization candidate network elements, a signal quality indicator; determining for each synchronization candidate network element a second synchronization accuracy value based on the signal quality indicator and the first synchronization accuracy value related to the synchronization candidate network element, and selecting a synchronizing network work element, for synchronizing the first network element to, from the at least two synchronization candidate network elements, based on the determined second synchronization accuracy values. The present disclosure enhances the performance of RIB network synchronization by indicating an estimate of an accumulated synchronization error magnitude.

Abstract: A technique including determining that a first access node serving a communication device is currently in a dormant, first state in which said first access node is not receiving radio transmissions; and controlling a radio transmitter or radio transceiver at said communication device to transmit a radio signal that triggers at least one second access node to alert said first access node of a request for said first access node to switch from said first state to a second state in which said first access node receives radio transmissions.

Abstract: A method and an apparatus for transmitting Hybrid Automatic Repeat reQuest (HARQ) indication information are provided. The method includes transmitting, by a UE, uplink data on a Physical Uplink Shared CHannel (PUSCH) according to scheduling of a base station; detecting, by the UE, a new UpLink (UL) grant and enhanced Physical HARQ Indication CHannel (ePHICH) information of the base station for the uplink data according to a synchronous HARQ timing relationship, wherein ePHICH resources used for bearing the ePHICH information are mapped to a portion of time-frequency resources of a distributed enhanced Physical Downlink Control CHannel (ePDCCH) set; and if the UL grant is not detected, the UE retransmitting the uplink data or not transmitting the uplink data according to an indication of the ePHICH information.