Data retransmission method is disclosed. The method includes: obtaining a mapping relationship between GTP-U sequence numbers of N data packets sent by a source node and source PDCP sequence numbers assigned to the N data packets by the source node; and performing data retransmission based on the mapping relationship.

A method by a user equipment (UE) for transmitting one or more power headroom reports (PHRs) is provided. The method includes receiving, from a base station (BS), a Radio Resource Control (RRC) configuration comprising a first RRC parameter that indicates a first operation mode of multiple PHRs for multiple transmission reception points (TRPs); and transmitting, to the BS, a PHR medium access control control element comprising a first power headroom (PH) associated with a first TRP and a second PH associated with a second TRP. The first TRP and the second TRP are associated with a serving cell of the BS. The first PH is a first Type-1 PH associated with first physical uplink shared channel (PUSCH) transmission toward the first TRP. The second PH is a second Type-1 PH associated with second PUSCH transmission toward the second TRP. The UE is configured with multi-TRP based PUSCH repetitions.

A method and a user equipment (UE) for handling a survival time state are provided. The method includes: receiving a Packet Data Convergence Protocol (PDCP) configuration for indicating that a Data Radio Bearer (DRB) associated with a PDCP entity supports a survival time state functionality, the PDCP entity being associated with at least two Radio Link Control (RLC) entities; receiving an Uplink (UL) grant for retransmission of a Medium Access Control (MAC) Protocol Data Unit (PDU), the MAC PDU including data from the DRB; entering the survival time state for the DRB upon receiving the UL grant; and activating a PDCP duplication for the PDCP entity during the survival time state.

A user equipment (UE) is described. The LE may comprise high-layer processing circuit configured to acquire a first RRC parameter, a second RRC parameter, a third RRC parameter, and a fourth RRC parameter, and transmission circuity configured to transmit a PUSCH in multiple slots.

A wireless device receives a first downlink control information (DCI) that schedules a reception of a transport block and indicates a hybrid automatic request (HARQ) process number with feedback disabled. The wireless device receives a second DCI that schedules a retransmission of the transport block and indicates the HARQ process number with feedback disabled, where the retransmission of the transport block overlaps in time with at least one symbol of a transmission of an uplink signal. Based on successfully decoding the transport block scheduled by the first DCI, the wireless device drops the retransmission of the transport block scheduled by the second DCI and transmits the uplink signal.

A method and apparatus are disclosed for efficient hybrid automatic repeat request (HARQ) process utilization for semi-persistent and dynamic data transmissions, wherein a reserved HARQ process identification (ID) can be reused. A subset of a plurality of HARQ process IDs is reserved to use for a semi-persistent allocation, and data is transmitted based on the semi-persistent allocation. A dynamic allocation is received via a physical downlink control channel (PDCCH). At least one of the reserved HARQ process IDs is selectively used for transmitting data based on the dynamic allocation.

Terminal device comprising; MAC layer control circuitry configured to manage a first timer for a HARQ process and a second timer for the HARQ process which starts with expiry of the first timer, and reception circuitry configured to receive a first PDCCH indicating a first transmission of a HARQ-ACK feedback for a transport block for the HARQ process and a second PDCCH indicating a second transmission of a second HARQ-ACK feedback for the transport block for the HARQ process where the second transmission occurs later than the first transmission, wherein, the MAC layer control circuitry configured to start the first timer for the HARQ process at a timing of the first transmission, the MAC layer control circuitry configured to start or restart the first timer for the HARQ process at a timing of the second transmission.

A wireless device receives a first downlink control information (DCI) comprising a first hybrid automatic request (HARQ) process identifier and a first new data indicator (NDI). A second DCI is received with the first HARQ process identifier and a second NDI. The second NDI is considered as toggled regardless of a value of the second NDI in response to the first DCI indicating postponing a HARQ acknowledgement transmission for a HARQ process identified by the first HARQ process identifier. The wireless device flushes a HARQ buffer associated with the HARQ process based on the second NDI being toggled.

An uplink channel resource indication method, an uplink channel resource determination method, a base station, a terminal and a medium are pr. The uplink channel resource indication method includes: indicating frequency domain resource information corresponding to N subbands contained in a current carrier to a UE through high-layer signaling, where N>1; and indicating one or more subbands for uplink data transmission to the UE through downlink control information, so that the UE uses a frequency domain resource corresponding to the one or more subbands for uplink data transmission to transmit uplink data based on frequency domain resource information corresponding to the one or more subbands for uplink data transmission. Resource utilization and performance of a NR network may be improved.

Certain aspects of the present disclosure provide techniques for cross-carrier retransmission. A method that may be performed by a user equipment (UE) includes monitoring for an initial transmission of data from a network on a first entity, generating a negative acknowledgement message indicating that decoding of the initial transmission of the data was unsuccessful, transmitting the negative acknowledgement message, and monitoring for a retransmission of the data on a second entity after the transmission of the negative acknowledgement message, the second entity being different than the first entity.