Abstract: A method and apparatus are provided for transmitting power headroom information by a terminal in a mobile communication system. The method includes receiving, by the terminal, information for an allocated uplink transmission resource; identifying whether a path loss has changed by more than a threshold, after transmitting last power headroom information, when the terminal has the allocated uplink transmission resource; in case that the path loss has changed by more than the threshold when the terminal has the allocated uplink transmission resource, determining a transmission of the power headroom information; and transmitting an uplink packet including the power headroom information based on the allocated uplink transmission resource. The power headroom information is obtained based on a difference between a maximum transmission power of the terminal and a transmission power of the terminal.

Abstract: Method for radio communication with base station, by user equipment (UE), apparatus in UE for radio communication with base station, a method for radio communication with a UE by a base station, and an apparatus in a base station for radio communication with a UE are provided. The method for radio communication with a base station, by a UE, includes identifying whether an uplink resource allocated for data transmission to the base station is available, in response to a buffer status report for transmission to the base station being triggered; transmitting an uplink packet including the buffer status report using the available uplink resource, in response to the uplink resource being available; and transmitting a scheduling request to the base station, in response to the UE not having an available uplink resource and a first timer being expired, wherein the first timer starts when the buffer status report is triggered.

Abstract: Methods and apparatuses are provided for establishing time alignment by a User Equipment (UE) in a wireless communication system. Information for identifying a dedicated preamble on a downlink control channel is received from a base station. The dedicated preamble is transmitted to the base station based on the information. A response message to the transmitted dedicated preamble is received from the base station on a downlink shared channel. The response message includes a timing adjustment information and information for a Channel Quality Indicator (CQI) report. Time alignment is established based on the timing adjustment information included in the response message. The CQI report based on the information for CQI report is transmitted to the base station.

Abstract: The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as long term evolution (LTE). A method for performing a measurement procedure by a user equipment (UE) in a wireless communication system supporting a dual connectivity (DC) is provided. The method includes receiving control information including measurement gap configuration information indicating gap configuration for at least one operating frequency band to which a measurement gap is applied; obtaining a system frame number (SFN) of a serving cell and a sub-frame of the serving cell based on the measurement gap configuration information; determining a first sub-frame of the measurement gap based on the SFN and the sub-frame; and performing a measurement on at least one serving cell including the serving cell at the first sub-frame.

Abstract: Methods and apparatus are provided in which a configuration message to configure at least one uplink carrier is received. A power headroom report (PHR) is triggered for a first uplink carrier if a predetermined event occurs. An allocation of an uplink transmission resource is detected for the PHR. It is identified whether the first uplink carrier for which a power headroom (PH) is to be determined is different from a second carrier to which the uplink transmission resource is allocated. The PH is determined based on a first pathloss associated with the first uplink carrier, if the first uplink carrier is different from the second carrier. The PHR generated based the determined PH is transmitted.

Abstract: A method and apparatus are provided for transmitting power headroom information by a terminal in a mobile communication system. The method includes receiving, by the terminal, information on an allocated uplink transmission resource; determining whether a path loss has changed more than a threshold, after transmitting last power headroom information, when the terminal has the allocated transmission resource; if the path loss has changed more than the threshold when the terminal has the allocated transmission resource, determining a transmission of the power headroom information; and transmitting an uplink packet including the power headroom information using the allocated uplink transmission resource.

Abstract: A wireless communication unit capable of moving between communication cells is described. The wireless communication unit comprises: a receiver arranged to receive a wireless signal; and a controller operably coupled to the receiver and comprising a layer 1 filtering module and a layer 3 filtering module. The controller is arranged to implement on the received wireless signal both: layer 1 filtering by the layer 1 filtering module at a physical layer; and layer 3 filtering by the layer 3 filtering module at a radio resource control layer. The layer 3 filtering module is operably coupled to a gradient calculation module arranged to calculate a gradient change that is representative of at least one of: a rate of change of received signal strength with a serving cell; a rate of received signal strength difference between a neighbour cell and a serving cell, such that at least a portion of layer 3 filtering of the received wireless signal is based on the calculated gradient change.

Abstract: Methods and apparatuses are provided for establishing time alignment by a terminal in a wireless communication system. Information for identifying a preamble is received from the base station on the downlink control channel. The preamble is transmitted to the base station based on the information for identifying the preamble. A message including information for a channel quality indicator (CQI) request is received from the base station. A CQI is transmitted to the base station based on the information for the CQI request response message. A CQI is transmitted to the base station based on the information for the CQI request.

Abstract: A method and an apparatus are provided in a wireless communication system. Mobility history information is generated including information on a time duration corresponding to out-of-service. It is identified whether the terminal is in a radio resource control (RRC) connected mode. The mobility history information is transmitted to a base station if the terminal is in the RRC connected mode.

Abstract: Methods and apparatuses are provided for communication between a UE and a node B in a communication system. The UE generates a media access control protocol data unit (MAC PDU) comprising at least one media access control service data unit (MAC SDU) and at least one field related to an amount of data. Each of the at least one field related to the amount of data corresponds to a respective identifier, and the at least one field related to the amount of data is placed prior to the at least one MAC SDU in the MAC PDU. The MAC PDU comprising the at least one MAC SDU and the at least one field related to the amount of data is transmitted to the node B. Grant information is received from the node B. Data is transmitted to the node B based on the grant information.

Abstract: A method and an apparatus are provided in a first radio access technology (RAT). Mobility history information is generated including information on a time duration while in a second RAT. It is identified whether the terminal is in a Radio Resource Control (RRC) connected mode. The mobility history information is transmitted to a base station if the terminal is in the RRC connected mode.

Abstract: A method and apparatus for increasing the success rate of a handover of a connected mode UE while minimizing the power consumption of the UE during DRX operation in a mobile communication system is provided. The method includes the steps of transmitting a cell change report to the serving base station, and then suspending the DRX operation to transition to an active mode; receiving a handover command message, and completing the handover to a target cell; checking if the handover command message includes a DRX resume command; waiting until a control message including the DRX resume command is received from the target base station; and after the control message including the DRX resume command is received, transitioning from the active mode to a sleep mode, and resuming the DRX operation.