Abstract: A method and apparatus for inter-RAT cell selection mechanism in NB-IOT in a wireless communication system is provided. A wireless device receives a configuration related to periodic uplink transmission. A wireless device performs the periodic uplink transmission on a suitable cell. A wireless device selects other suitable cell, based on a periodicity of the periodic uplink transmission. A wireless device performs the periodic uplink transmission on the selected suitable cell.

Abstract: A method and apparatus for start and stop of reception of downlink (DL) transmission based on a paging in a wireless communication system is provided. A wireless device, upon receiving a paging, resumes a radio bearer in an idle state (e.g., RRC_IDLE) and/or an inactive state (e.g., RRC_INACTIVE).

Abstract: A method and an apparatus for entering a connected state with a network for continuing transmission in a wireless communication system is provided. The method may include starting a Time Alignment Timer (TAT). The method may include leaving a connected state with a network. The method may include performing transmission with a configured grant, wherein the configured grant is received from the network, while in leaving the connected state. The method may include performing a random access (RA) to the network, after the TAT is expired.

Abstract: A method and apparatus for random access procedure with an acknowledgement in wireless communication system is provided. A wireless device, in the wireless communication system, performs a first Random Access (RA) transmission to a network. The wireless device receives, from the network, a first Random Access Response (RAR) message in response to the first RA transmission. The wireless device attempts to decode the first RAR message. The wireless device transmits an acknowledgment (ACK) to the network based on that the first RAR message is successfully decoded. The wireless device performs a second RA transmission to the network based on that the first RAR message is not successfully decoded.

Abstract: Provided are a method for a user equipment (UE) to perform access barring check in a wireless communication system, and an apparatus supporting the same. The method may include: receiving a list of barring information, wherein each of the barring information includes a barring factor and a barring time; receiving information on an access category related to barring information included in the list; performing the access barring check for the access category, based on the barring information related to the access category; and performing uplink transmission, if an access attempt is allowed for the access category.

Abstract: A disclosure of the present specification provides a method for transmitting a radio resource control (RRC) message by a wireless device. The method may comprise the steps of: acquiring, by an access stratum (AS) layer of a wireless device, at least one of the value and indication of an RRC establishment cause field from a non-access stratum (NAS) layer which requests transmission of an NAS signaling request message; transmitting, to a base station, an RRC connection request message including the at least one of the value and indication of the RRC establishment cause field; and when the at least one of the value and indication of the RRC establishment cause field is set to a value, which indicates that the NAS signaling request message includes user data, according to an optimization scheme through a control plane (CP), if a network is in an overload state, receiving an RRC connection rejection message or an RRC connection release request message from the base station.

Abstract: A method and apparatus for access control for data transmission in idle mode and/or inactive mode in a wireless communication system is provided. An allowed timer is defined, and the allowed timer is started based on a result of access barring check. While the allowed timer is running, the wireless device can perform an uplink (UL) transmission without further access barring check.

Abstract: Provided are a method for a user equipment (UE) to perform early data transmission (EDT) in a wireless communication, and an apparatus supporting the same. The method may include: transmitting a first radio resource control (RRC) message for the EDT, to a base station; receiving a second RRC message in response to the first RRC message, from the base station; if the second RRC message indicates that the EDT is successful, considering that the EDT ends successfully; if the second RRC message indicates that the EDT is unsuccessful, considering that the EDT ends unsuccessfully; and entering a RRC_IDLE state.

Abstract: Provided are a method for a user equipment (UE) to perform early data transmission (EDT) in a wireless communication, and an apparatus supporting the same. The method may include: transmitting a first radio resource control (RRC) message for the EDT, to a base station; receiving a second RRC message in response to the first RRC message, from the base station; if the second RRC message indicates that the EDT is successful, considering that the EDT ends successfully; if the second RRC message indicates that the EDT is unsuccessful, considering that the EDT ends unsuccessfully; and entering a RRC_IDLE state.

Abstract: Provided are a method for a user equipment (UE) to perform early data transmission (EDT) in a wireless communication, and an apparatus supporting the same. The method may include: receiving system information including a threshold for the EDT; determining whether or not a condition for initiating the EDT is satisfied, by comparing the threshold for the EDT with a size of data for transmission; if the condition is satisfied, performing the EDT; and if the condition is not satisfied, performing a radio resource control (RRC) connection establishment or resume procedure.

Abstract: Provided are a method for a user equipment (UE) to perform access to a cell in a wireless communication, and an apparatus supporting the same. The method may include: receiving, from a first system, access control information for the first system; camping on the cell of a second system; mapping the access control information for the first system to access control information for the second system; and performing access to the cell of the second system, based on the mapped access control information for the second system.

Abstract: Provided are a method for a user equipment (UE) to perform access to a cell in a wireless communication, and an apparatus supporting the same. The method may include: receiving, from a first system, access control information for the first system; camping on the cell of a second system; mapping the access control information for the first system to access control information for the second system; and performing access to the cell of the second system, based on the mapped access control information for the second system.

Abstract: Provided are a method for a user equipment (UE) to perform access barring check in a wireless communication system, and an apparatus supporting the same. The method may include: receiving a list of barring information, wherein each of the barring information includes a barring factor and a barring time; receiving information on an access category related to barring information included in the list; performing the access barring check for the access category, based on the barring information related to the access category; and performing uplink transmission, if an access attempt is allowed for the access category.

Abstract: Provided are a method for a user equipment (UE) to perform access to a cell in a wireless communication, and an apparatus supporting the same. The method may include: receiving, from a first system, access control information for the first system; camping on the cell of a second system; mapping the access control information for the first system to access control information for the second system; and performing access to the cell of the second system, based on the mapped access control information for the second system.

Abstract: A method and apparatus for path selection scheme for a master cell group (MCG) failure reporting is provided. A wireless device configured to operate in a wireless communication system determines a path for master cell group (MCG) failure information to inform a failure on a primary cell (PCell) of a MCG from among the at least one secondary ell (SCell) of the MCG and a secondary cell group (SCG), and transmits the MCG failure information via the determined path.

Abstract: Disclosed are an overload control method in a wireless communication system and a device for the same. Specifically, a method by which a base station performs an overload control in a wireless communication system can include: a step of receiving an overload start message from a core network; a step of receiving a first radio resource control (RRC) message including a non-access stratum (NAS) message from user equipment (UE); and a step of transmitting an RRC connection release message, for instructing the release of an RRC connection, to the UE when an instruction for instructing data transmission through a control plane in the first RRC message is included.

Abstract: A method and apparatus for discarding data among associated transmission buffers in a wireless communication system is provided. A wireless device generates a first data packet and a second data packet, and performs a random access (RA) procedure based on the first data packet. When the RA procedure based on the first data packet fails, the wireless device discards the first data packet, and continues the RA procedure based on the second data packet. A media access control (MAC) layer indicates a radio resource control (RRC) layer that the RA procedure based on the second data packet is performed.

Abstract: Provided are a method for transmitting a message by a user equipment (UE) in a wireless communication, and an apparatus supporting the same. The method may include: initiating early data transmission; receiving a random access response message including an uplink grant, from a base station (BS); based on the uplink grant, determining whether or not to transmit a first message related to the early data transmission to the BS, in response to the random access response message; and after determining to transmit the first message related to the early data transmission, resuming radio bearers for the early data transmission.

Abstract: Provided are a method for skipping contention resolution. According to an embodiment of the present disclosure, the method includes leaving radio resource control (RRC) connected state, while leaving RRC connected state, receiving information on timing advance in a paging occasion, adapting the timing advance and performing transmission based on the adapted timing advance.

Abstract: A method and apparatus for random access fallback procedure related to MT EDT in a wireless communication system is provided. A wireless device receives, from the network, a paging including a dedicated random access (RA) resource corresponding to a first coverage enhancement (CE) level. A wireless device initiates a first RA attempt using the dedicated RA resource. A wireless device increases a CE level of the wireless device to a second CE level based on failure of the first RA attempt. A wireless device selects a non-dedicated RA resource corresponding the second CE level. A wireless device performs a second RA attempt using the non-dedicated RA resource.