Abstract: The present invention relates to a method of transmitting data units by a Radio Link Control (RLC) entity of a user equipment (UE) in a Radio Resource Control (RRC) INACTIVE state in a wireless communication system. Especially, the method includes the steps of transmitting at least one first data unit without the poll in the RRC INACTIVE state to a peer RLC entity; based on a number of the at least one first data unit without the poll being equal to or greater than a threshold value, shifting to a RRC CONNECTED state; transmitting a second data unit with the poll in the RRC CONNECTED state to the peer RLC entity; and receiving a status report for the at least one first data unit without the poll and the second data unit with the poll from the peer RLC entity.

Abstract: The present disclosure relates to a method of transmitting data units for on-time service by a Packet Data Convergence Protocol (PDCP) entity of a User Equipment (UE) in a wireless communication system. In particular, the method includes the steps of: receiving at least one PDCP service data unit (SDU) related to an on-time service from an upper layer with starting at least one delay timer of the at least one PDCP SDU for ensuring an arrival of the at least one PDCP SDU within a required time duration at a reception end; generating at least one PDCP protocol data unit (PDU) related to the at least one PDCP SDU based on the delay timer expiring; and submitting the at least one PDCP PDU to a lower layer.

Abstract: The present disclosure relates to a method of performing operations for a User Equipment (UE) in a wireless communication system. In particular, the method includes the steps of: receiving a first data unit from an upper layer; receiving a congestion indicator from a network; and based on the first data unit being a critical data unit, transmitting the first data unit to the network, wherein, based on the first data unit not being the critical data unit, the first data unit is discarded.

Abstract: The present invention relates to a method of transmitting a signal by a user equipment (UE) in a wireless communication system. Especially, the method includes the steps of receiving a handover command containing configurations for a second network, from a first network; performing a random access procedure to the second network; re-establishing a packet data convergence protocol (PDCP) entity associated with a signaling radio bearer (SRB) based on the configurations for the second network, after a random access procedure to the second network successes; transmitting a radio resource control (RRC) message to the second network using the re-established PDCP entity.

Abstract: The present disclosure relates to a method of performing operations for a User Equipment (UE) in a wireless communication system. In particular, the method includes configuring a Quality of Service (QOS) flow and at least two Sub-QoS flows associated with the QoS flow, wherein a first Sub-QoS flow of the at least two Sub-QoS flows is associated with a first data type and is mapped to a first data radio bearer (DRB), wherein a second Sub-QoS flow of the at least two Sub-QoS flows is associated with a second data type and is mapped to a second DRB, receiving an uplink data unit from an upper layer; and based on one of the first and second data types to which the uplink data unit belongs, submitting the uplink data unit to one of the first and second DRBs to which Sub-QoS flow associated with corresponding data type is mapped.

Abstract: The present invention relates to a method of transmitting a data unit by a packet data convergence protocol (PDCP) entity of a user equipment (UE) in a wireless communication system. Especially, the PDCP entity is associated with at least two radio link control (RLC) entities and is configured with PDCP duplication. Further, the method includes the steps of receiving a PDCP service data unit (SDU) from an upper layer; constructing a PDCP protocol data unit (PDU) using the PDCP SDU; duplicating the PDCP PDU based on the PDCP duplication being activated; and transmitting the PDCP PDU and at least one duplicated PDCP PDU to the at least two RLC entity, wherein, based on the PDCP duplication being activated, constructing the PDCP PDU comprises compressing the PDCP SDU.

Abstract: The present disclosure relates to a method for transmitting duplicated data units by considering measurement gap in a wireless communication system. In particular, the method includes the steps of: generating a Medium Access Control (MAC) Protocol Data Unit (PDU) containing a MAC Service Data Unit (SDU) associated with a logical channel; and transmitting the MAC PDU based on there being no measurement gap at the time of the transmission, wherein, based on there being the measurement gap at the time of the transmission, a Packet Data Convergence Protocol (PDCP) duplication of a Radio Bearer (RB) related to the logical channel is activated.

Abstract: The present disclosure relates to a method of performing operations by PDCP entity of a User Equipment (UE). In particular, the method includes performing a transmission of a first PDCP SDU compressed based on a first UDC context, wherein the first UDC context is updated based on the first PDCP SDU; receiving a successful delivery confirmation of the first PDCP SDU, wherein a second UDC context is updated based on the first PDCP SDU; performing a transmission of a second PDCP SDU compressed based on the first UDC context, wherein the first UDC context is updated based on the second PDCP SDU; based on an indication for re-establishment being received before receiving a successful delivery confirmation of the second PDCP SDU, overriding the second UDC context to the first UDC context and performing a retransmission of the second PDCP SDU compressed based on the overridden first UDC context.

Abstract: The present invention relates to a method for transmitting signals by a transmission end in a wireless communication system. In particular, the method includes the steps of: configuring one Packet Data Convergence Protocol (PDCP) entity, at least one first RLC entity related to the one PDCP entity and at least one second RLC entity related to the one PDCP entity; determining whether a service data unit (SDU) to be transmitted is a special SDU or not; if the SDU is the special SDU, transmitting the SDU to the at least one first RLC entity; and if the SDU is not the special SDU, transmitting the SDU to the at least one second RLC entity.

Abstract: The present disclosure relates to a method of performing a frame level discard operation by a user equipment (UE) in a wireless communication system.

Abstract: The present invention relates to a method of performing a user plane integrity protection (UPIP) based on data volume by a user equipment (UE) in a wireless communication system. Especially, the method includes the steps of activating an integrity protection for a radio bearer (RB): receiving a Packet Data Convergence Protocol (PDCP) data unit related to the RB from an upper layer; and transmitting the PDCP data unit via the RB to a reception end, with applying the integrity protection to the PDCP data unit, wherein, based on a data volume of the PDCP data being greater than a data volume threshold, applying the integrity protection is skipped.

Abstract: The present disclosure relates to a method of communicating via paired serving cells by a user equipment (UE) in a wireless communication system. In particular, the method includes the steps of: receiving a first Packet Data Convergence Protocol (PDCP) service data unit (SDU) from an upper layer, wherein a concatenation timer is started upon the first PDCP SDU is received based on the concatenation timer not being running; receiving a second PDCP SDU from the upper layer; generating a PDCP protocol data unit (PDU) including the first PDCP SDU and the second PDCP SDU, based on the concatenation timer being running; applying ciphering to the PDCP PDU; and submitting the PDCP PDU to a lower layer, wherein the concatenation timer is stopped upon the PDCP PDU is submitted to the lower layer.

Abstract: The present invention relates to a method of transmitting packets by a user equipment (UE) in a wireless communication system, wherein the UE is related to a first network and a second network. In particular, the method includes the steps of: transmitting packets containing compressed header information to the first network; receiving, from the first network, a handover command to connect with the second network; and transmitting packets containing a full header information to at least one of the first network or the second network.

Abstract: The present invention relates to a method for processing data units by a Packet Data Convergence Protocol (PDCP) entity of a user equipment (UE) in a wireless communication system. In particular, the method includes the steps of: receiving a first data unit having a specific count value from a lower layer; and discarding the first data unit, when there is a second data unit having the specific count value which was received before the first data unit and for which an integrity verification was successful.

Abstract: The present disclosure relates to a method of receiving data units by a user equipment (UE) in a wireless communication system.

Abstract: The present invention relates to a method for transmitting multiple data units by a user equipment (UE) in a wireless communication system. Especially, the method includes the steps of receiving information related to at least one configured grant, wherein each of the at least one configured grant comprises a plurality of configured grant occasions; selecting at least one configured grant occasion within a predetermined duration when the multiple data units to be transmitted becomes available, among the plurality of configured grant occasions belonging to the least one configured grant; and transmitting the multiple data units on the at least one configured grant occasion, wherein, based on a data unit among the multiple data units being transmitted firstly within the predetermined duration, information related to the at least one configured grant occasion to be used within the predetermined duration is transmitted.

Abstract: The present disclosure relates to a method of performing a frame level retransmission by a user equipment (UE) in a wireless communication system. In particular, the method includes the steps of: transmitting at least one first data unit among multiple data units associated with a frame to a receiving side; receiving a retransmission indication; and based on a second data unit among the multiple data units not being successfully transmitted to the receiving side, performing retransmission for the multiple data units associated with the frame.

Abstract: The present invention relates to a method of transmitting a scheduling request (SR) by a user equipment (UE) in a wireless communication system, wherein the UE is connected to a first network. In particular, the method includes the steps of: performing a random access procedure with a second network; and based on the random access procedure being successfully performed, discarding packets which are stored in a buffer for transmission to the first network.

Abstract: The present invention relates to a method of transmitting a data unit by a user equipment (UE) belonging to a UE group in a wireless communication system. Especially, the method includes the steps of receiving the data unit from an upper layer; associating first time information with the data unit; transmitting a request message for transmitting the data unit; receiving an uplink grant with second time information related to the UE group in response to the request message; transmitting the data unit with the first time information on the uplink grant based on the first time information not being matched with the second time information, wherein the data unit is discarded based on the first time information being matched with the second time information.

Abstract: The present disclosure relates to a method of performing data transmissions in a Radio Resource Control (RRC) INACTIVE state by a user equipment (UE) in a wireless communication system. Especially, the method includes the steps of generating at least one Small Data Transmission (SDT) data unit that can be transmitted in RRC INACTIVE state; triggering a SDT procedure for transmitting the at least one SDT data unit in RRC INACTIVE state; generating a non-SDT data unit that cannot be transmitted in RRC_INACTIVE during the SDT procedure; generating an indication message informing that there is the non-SDT data unit, based on an uplink grant related to the SDT procedure for transmitting the indication message being available; and transmitting the indication message via a Dedicated Control Channel (DCCH) during the SDT procedure to a network.