Abstract: A Method and Apparatus for sidelink positioning is provided. The method includes receiving a SystemInformationBlock12 in a first cell, initiating sidelink positioning in the first cell if the SystemInformationBlock12 includes a sl-PositioningAllowed field set to a first value, and performing sidelink positioning based on a sidelink positioning resource pool or based on a specific sidelink resource pool. Configuration information of the specific sidelink resource pool includes sl_Pos_Allowed field set to a first value. The SystemInformationBlock12 includes a SL-ConfigCommonNR and a SL_Pos_ConfigCommon. The SL_Pos_ConfigCommon includes a one or more Sl_Pos_ResourcePool IEs.

Abstract: A method and apparatus for layer 2 mobility is provided. Method for lower layer mobility includes transmitting the UECapabilityInformation to the base station, receiving a RRCReconfigruation from the base station, receiving a PDCCH order from the base station, transmitting a preamble to the base station based on the PDCCH order, receiving a response from the base station and determining Timing advance between downlink and uplink (TTA). If the type1 PDCCH order was received, the terminal determining TTA of a first cell based on the first field (TAC) and the subcarrier spacing for a first PUSCH transmission. The first cell is the cell where the first PDCCH order was received. If the type2 PDCCH order was received, the terminal determining TTA of a second cell based on the first field and the subcarrier spacing for the preamble transmission and the second field (CMG identifier).

Abstract: A method and apparatus for layer 2 mobility is provided. Method for lower layer mobility includes receiving from a base station a first RRC message and a second RRC message, receiving from the base station a first MAC CE, monitoring PDCCH for the first identifier and the second identifier, adjusting uplink transmission power based on TPC command in PDCCH addressed by the second identifier, performing uplink transmission based on uplink scheduling information in PDCCH addressed by the first identifier, receiving from the base station a second MAC CE, and adjusting uplink transmission power based on TPC command in PDCCH addressed by the fourth identifier, performing uplink transmission based on uplink scheduling information in PDCCH addressed by the second identifier.

Abstract: A method and apparatus for layer 2 mobility is provided. Method for lower layer mobility includes transmitting the UECapabilityInformation to the base station, receiving a RRCReconfigruation from the base station, receiving a PDCCH order from the base station and determining the transmission power of the preamble and transmitting a preamble to the base station based on the PDCCH order. If the PDCCH order is a type1 PDCCH order, preamble transmission power is determined based on a first parameter set and pathloss of a first cell. If PDCCH order is a type2 PDCCH order, preamble transmission power is determined based on a second parameter set and a first information (CMG identifier) and a second information (transmission power related information) and pathloss of a second cell.

Abstract: A method and apparatus for positioning in a mobile communication system are provided. Method for positioning includes receiving a SI, transmitting a UECapabilityInformation, transmitting a provideCapabilities, transmitting a RequestAssistanceData, receiving a ProvideAssistanceData, receiving a RRCRelease, transmitting a positioning SRS in RRC_INACTIVE state and transmitting and a ProvideLocationInformation in RRC_INACTIVE state. the ProvideAssistanceData includes a PRS data or a validity information. The UECapabilityInformation includes a capability information indicating support of SRS for positioning in RRC_INACTIVE. The provideCapabilities includes a capability information related to PRS in RRC_INACTIVE.

Abstract: A method for in-device coexistence information reporting is provided. The method includes receiving from a base station a first Radio Resource Control (RRC) message, transmitting a second RRC message, the second RRC message includes an in-device coexistence information, receiving a third RRC message, and applying a configuration based on the third RRC message. A first in-device coexistence information is included in the second RRC message if the first RRC message includes a first information, the first in-device coexistence information includes information related to frequency domain, the first information configures the terminal to report in-device coexistence information related to frequency domain.

Abstract: A Method and Apparatus for discontinuous reception and discontinuous transmission are provided. The method includes transmitting a UECapabilityInformation to the GNB, receiving a RRCReconfiguration form the GNB, performing a first DRX operation for a first cell and a third DRX operation for a second cell based on the RRCReconfiguration and current-drx2-ConfigId, receiving a first MAC CE from the GNB and performing DRX operation based on the first MAC CE. The performing DRX operation comprises receiving or not receiving downlink reference signal.

Abstract: A method and apparatus for accessing a NR cell in a mobile communication system are provided. Method for accessing a NR cell includes receiving, by a terminal from a base station, a System Information Block1, determining, by the terminal, a preamble format and a subframe and a starting symbol based on the prach-ConfigurationIndex included in the first RACH-ConfigCommon if the second RACH-ConfigCommon is not included in the ServingCellConfigCommon and the prach-ConfigurationIndex included in the second RACH-ConfigCommon if the second RACH-ConfigCommon is included in the ServingCellConfigCommon and transmitting, by the terminal, the preamble based at least in part on the preamble format and the subframe and the starting symbol.

Abstract: A method and apparatus for data transfer in RRC_INACTIVE state is provided. Method for data transfer in RRC_INACTIVE state includes transmitting a UECapabilityInformation, receiving a RRCRelease the RRC release message includes a first information for a second resume procedure, receiving a system information the system information includes a first threshold and a second threshold, initiating a second resume procedure and cancelling triggered PHR.

Abstract: A method and apparatus for layer 2 mobility is provided. Method for lower layer mobility includes receiving from a base station a first RRC message and a second RRC message, receiving from the base station a first MAC CE, the first MAC CE comprises an identifier related to the first configuration information, applying the first configuration information at a first point of time, receiving from the base station a second MAC CE, and applying the second configuration information at a second point of time. The first point of time is determined based on a number of a first slot and HARQ feedback transmission for first MAC CE. The second point of time is determined based on a number of a second slot and HARQ feedback transmission for second MAC CE.

Abstract: A method and apparatus for monitoring paging in a mobile communication system are provided. Method for monitoring paging includes receiving a first message including first paging cycle and second paging cycle from the AMF, receiving a second message including third paging cycle and fourth paging cycle from the base station, receiving a system information including an information related to the support of extended DRX, determining a reference DRX cycle and monitoring paging occasion based on the reference DRX cycle.

Abstract: method and apparatus for paging is provided. Method of base station for paging includes transmitting SystemInformationBlock1, receiving a paging message from the second base station or AMF, determining the index of the Paging-Occasion based at least in part on the information included in the paging message and transmitting an RRC paging message through a paging channel to the paging-occasion determined based on the index of the paging-occasion and the PF.

Abstract: A method and apparatus for layer 2 mobility is provided. Method for lower layer mobility includes receiving from a base station a first RRC message, the first RRC message comprises a first configuration information, establishing a PDCP entity and a first RLC entity, performing reception of PDCP SDUs via the PDCP entity and the first RLC entity, receiving from the base station a second RRC message, the second RRC message comprises a second configuration information, establishing a second RLC entities based on a RLC configuration information in the first configuration information and a RLC configuration information in the second configuration information, receiving a first MAC CE, and performing reception of PDCP SDUs via the PDCP entity and the second RLC entity.

Abstract: A method and apparatus for layer 2 mobility is provided. Method for lower layer mobility includes receiving from a base station a RRC message, receiving from the base station a first MAC CE in a first cell, monitoring PDCCH based on the first temporary identifier in a second cell, adjusting PUCCH transmission power based on TPC command in PDCCH addressed by the first temporary identifier, performing PUCCH transmission based on the first PUCCH information in the second cell, receiving from the base station a second MAC CE in the second cell, monitoring PDCCH for the second temporary identifier in the first cell, adjusting PUCCH transmission power based on TPC command in PDCCH addressed by the second temporary identifier and performing PUCCH transmission based on the second PUCCH information the first cell.

Abstract: A method and apparatus for accessing a NR cell in a mobile communication system are provided. Method for accessing a NR cell includes receiving in a first cell, by a terminal from a base station, a System Information Block1, monitoring, by the terminal, Physical Downlink Control Channel (PDCCH) for Random Access Response based at least in part on a specific ra-ResponseWindow and a specific ra-SearchSpace.

Abstract: A Method and Apparatus for performing small data transmission is provided. The method includes transmitting UECapabilityInformation to the base station, The UECapabilityInformation includes type 1 SDT support information and type 2 SDT support information, transmitting a message containing the UE NETWORK CAPACITY to the AMF, Specific bits in the UE NETWORK CAPABILITY indicate whether RRC CONNECTION RESUME3 is supported, receiving an RRCRelease from the base station, The RRCRelease comprises a SuspendConfig, In response to receiving said RRCRelease message, entering the RRC_INACTIVE state and performs cell selection, monitoring the paging channel in the selected cell, and initiating RRC CONNECTION RESUME3 or performing the first set of actions upon receiving a first paging message or a third paging message.

Abstract: A method and apparatus for layer 2 mobility is provided. Method for lower layer mobility includes receiving from a base station a first RRC message and a second RRC message, receiving from the base station a first MAC CE, performing DRX operation based on the first DRX configuration information and the first identifier, receiving from the base station a second MAC CE, and performing DRX operation based on the second DRX configuration information and the second identifier. The first MAC CE comprises an identifier related to a first configuration information. The first configuration information comprises the first identifier and the first DRX configuration information.

Abstract: A Method and Apparatus for sidelink positioning is provided. The method includes receiving a SystemInformationBlock12 in a first cell, and transmitting to a type1 UE either a SL MAC CE or a first sidelink signal or a second sidelink signal. The SystemInformationBlock12 includes a SL-ConfigCommonNR and a SL_Pos_ConfigCommon. The SL_Pos_ConfigCommon includes a one or more Sl_Pos_ResourcePool IEs. The first sidelink signal is transmitted on a second resource pool. The second sidelink signal is transmitted on a third resource pool. The first sidelink signal is Synchronization signal or PSBCH and the second sidelink signal is PRS. The first resource pool is configured by a first SL-ResourcePool IE in SystemInformationBlock12. The second resource pool is configured by a second SL-ResourcePool IE in SystemInformationBlock12. The third resource pool is configured by a SL_Pos_ResourcePool IE in the RRCReconfigurationSidelink. The SL MAC CE is transmitted on a first resource pool.

Abstract: A method and apparatus for layer 2 mobility is provided. Method for lower layer mobility includes receiving from a base station a first RRC message and a second RRC message, receiving from the base station a MAC CE, and performing an uplink transmission. The uplink transmission is performed based on the first PDCP configuration and the first BSR configuration and the first PHR configuration if the MAC CE is a first MAC CE. The uplink transmission is performed based on the first PDCP configuration and the second BSR configuration and the second PHR configuration if the MAC CE is a second MAC CE.

Abstract: A method and apparatus for accessing a NR cell in a mobile communication system are provided. Method for accessing a NR cell includes receiving in a first cell, by a terminal from a base station, a Master Information Block (MIB) and a System Information Block1 (SIB1), determining, by the terminal, if the first cell is barred and performing by the terminal either a first operation group or a second operation group if the cell is barred and perform, if the first cell is not barred, a third operation group.