Abstract: A communication method and a terminal and a base station adapted to the method are provided. The communication method of a terminal includes: receiving a message containing information regarding a semi-persistent scheduling (SRS) configuration from a base station; determining whether a sub-frame configured with a non-adaptive re-transmission is identical to a sub-frame configured with an uplink grant according to the SPS configuration; and when: a sub-frame configured with a non-adaptive re-transmission is identical to a sub-frame configured with an uplink grant according to the SPS configuration; and the terminal does not have data to be first transmitted via the sub-frame configured with an uplink grant according to the SPS configuration, performing the non-adaptive re-transmission.

Abstract: The present invention proposes a method of processing a buffer state report when a wireless communication system uses inter-eNB carrier aggregation technology. According to the present invention, a terminal may be provided with a proper amount of uplink resource allocations by notifying base stations of a buffer state.

Abstract: According to an embodiment, a method for selecting an access network at user equipment in a mobile communication system includes step of receiving, from a base station, first setting information, and step of selecting the access network based on second setting information if the second setting information is received from the base station, or selecting the access network based on the first setting information if no second setting information is received. Using the proposed method, the user equipment can reduce user's inconvenience and save battery by blocking unnecessary offloading and wireless LAN scanning, and also can improve the quality of use and immediately respond to a cell change by preventing a ping-pong phenomenon.

Abstract: A multicarrier-based data transmission method and an apparatus for use in a mobile communication system are provided. A Radio Network Temporary Identity (RNTI) reception method of a terminal in a wireless communication system supporting inter-evolved Node B (eNB) carrier aggregation includes receiving cell information on at least one activated cell under control of an eNB, configuring first and second RNTIs allocated by the eNB, monitoring the at least one activated cell for the first RNTI, and monitoring a primary cell among the at least one activated cell for the second RNTI.

Abstract: The present disclosure relates to a communication method and system for converging a 5th Generation (5G) communication system for supporting higher data rates beyond a 4th Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A cell selection/re-selection method and an apparatus adapted thereto is provided.

Abstract: A random access method and an apparatus of a terminal for performing random access procedure to multiple base stations in parallel in a Long Term Evolution (LTE) system supporting dual connectivity are provided. The method includes determining whether a first preamble transmission to a first cell of a first base station is overlapped with a second preamble transmission to a second cell of a second base station in a time domain, determining, when the first preamble transmission is overlapped with the second preamble transmission in the time domain, whether a sum of transmit powers calculated for the first and second preamble transmissions is greater than a maximum allowed transmit power of the terminal, and controlling, when the sum of the first and second preamble transmit powers is greater than the maximum allowed transmit power, the transmit power calculated for the second preamble transmission.

Abstract: A method for transmitting packet data units Packet Data Units (PDUs) at a PDU transmitter in a communication system is provided. The method includes transmitting a first PDU comprising a PDU header and a data portion, receiving Negative Acknowledgement NACK information for the first PDU, segmenting the first PDU to form one or more PDU segments if a size of a second PDU for retransmission is smaller than a size of the first PDU, wherein each of the one or more PDU segment comprises a PDU segment header and a data portion, and transmitting the one or more PDU segment to a PDU receiver.

Abstract: The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method for managing system information (SI) window in a wireless communication system is provided. The method includes determining a plurality of SI messages to be transmitted at a time point, identifying a SI window number at the time point, and determining at least one of SI message among the plurality of SI messages, the at least one of SI message being included in a SI window corresponding to the SI window number.

Abstract: A System Frame Number (SFN) acquisition method is provided. The System Frame Number (SFN) acquisition method of a terminal according to the present invention includes receiving a first message for adding a secondary cell of a secondary base station from a primary cell of a primary base station, receiving a Master Information Block (MIB) broadcast in the secondary cell, and acquiring a SFN information for the secondary cell from the MIB, and applying the SFN information to at least one cell of the secondary base station.

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: Methods and apparatuses are provided for transmitting a status report by a receiving device including an automatic repeat request (ARQ) entity and a hybrid ARQ (HARQ) processor, in a mobile communication system. The method includes transmitting, by the HARQ processor, a packet provided from the ARQ entity to a receiving device; receiving, by the HARQ processor, a packet including a status report including a reception status of the transmitted packet from the receiving device; and providing, by the HARQ processor, the status report to the ARQ entity. The status report is generated, by an ARQ entity of the receiving device at a transmission opportunity indicated by a HARQ processor of the receiving device, in response to the status report being triggered based on at least one triggering condition by the ARQ entity of the receiving device.

Abstract: A method for operating a terminal in a wireless communication system is provided. The method includes decoding data which is received data or combined data, in case that the data is successfully decoded, determining whether the decoding of the data is a first successful decoding, and, in case that the decoding of the data is the first successful decoding, delivering the decoded data to a disassembly and demultiplexing entity.

Abstract: A method and apparatus are provided for controlling an active state in a mobile communication system. The method includes receiving, from a base station, information related to a starting position of an active state and information related to a length of a first timer; deriving the starting position of the active state based on the information related to the starting position; starting the first timer set to the length of the first timer and entering the active state at the derived starting position; extending the active state, in response to control data indicating a new transmission of user data being received on a control channel; and terminating the active state, based on a control signal indicating a termination of the active state and a second timer for extending the active state. The second timer is started while the first timer is running, and the active state is terminated by the expiration of the second timer.

Abstract: A bearer reconfiguration method performed by a User Equipment (UE) in a wireless communication system supporting a multi-bearer is provided. The bearer reconfiguration method includes, if the UE performs a bearer reconfiguration from a single bearer to the multi-bearer, reordering Packet Data Convergence Protocol (PDCP) Protocol Data Units (PDUs) received through the multi-bearer, using a timer after a completion of the bearer reconfiguration, and processing the reordered PDCP PDUs into at least one PDCP Service Data Unit (SDU). The method may also include, if the UE performs bearer reconfiguration from the multi-bearer to the single bearer, reordering PDCP PDUs received through the multi-bearer, using a timer until a predetermined condition is satisfied, and processing the reordered PDCP PDUs into at least one PDCP SDU.

Abstract: A communication technique of fusing a fifth generation (5G) communication system for supporting higher data transmission rate beyond a fourth generation (4G) system with an Internet of things (IoT) technology and a system thereof are provided. The communication technique may be used for an intelligent service (for example, a smart home, a smart building, a smart city, a smart car or a connected car, health care, digital education, a retail business, a security and safety related service, or the like) based on the 5G communication technology and the IoT related technology. A method for defining media access control (MAC) sub-header structures suitable for a next generation mobile communication system and applying the MAC sub-header structures to provide a high data transmission rate and a low latency in the next generation mobile communication system is provided.

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: A method for transmitting packet data units Packet Data Units (PDUs) at a PDU transmitter in a communication system is provided. The method includes transmitting a first PDU comprising a PDU header and a data portion, receiving Negative Acknowledgement NACK information for the first PDU, segmenting the first PDU to form one or more PDU segments if a size of a second PDU for retransmission is smaller than a size of the first PDU, wherein each of the one or more PDU segment comprises a PDU segment header and a data portion, and transmitting the one or more PDU segment to a PDU receiver.

Abstract: A method for transmitting terminal capability information in a communication system supporting a plurality of carriers is provided. The method includes transmitting a control message including terminal capability information, wherein the terminal capability information includes at least one of an information element (IE) indicating whether to support a multi-bearer, an IE indicating whether to support a secondary cell group (SCG) bearer, or an IE indicating whether to support dual connectivity (DC).

Abstract: The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A communication method and apparatus in a wireless communication system is provided. The communication method of a terminal in a wireless communication system includes: connecting to a cellular network via a base station; receiving a control message comprising measurement-related information associated with a wireless local area network (WLAN) from the base station; and measuring the WLAN based on the measurement-related information.

Abstract: A transmission control method for HARQ is provided for improving HARQ performance in a mobile communication system. The transmission control method for Hybrid Automatic Repeat reQuest (HARQ) in a mobile communication system according to the present invention includes receiving an downlink resource assignment message; determining whether configured downlink assignment has been indicated to an HARQ entity since a previously received downlink assignment for a User Equipment's (UE's) Cell-Radio Network Temporary Identifier (C-RNTI) for the same HARQ process; maintaining, if the configured downlink assignment has not been indicated to the HARQ entity, the HARQ process; and processing, if the configured downlink assignment has been indicated to the HARQ entity, the downlink resource assignment message as a resource assignment message for initial transmission.