Abstract:
The present disclosure relates to a communication technique for converging IoT technology and a 5G communication system for supporting higher data transmission rate after a 4G system, and a system thereof. The present disclosure can be applied to an intelligent service (for example, a smart home, smart building, smart city, smart car or connected car, health care, digital education, retail business, and security and safety related service etc.) based on 5G communication technology and IoT related technology. The present invention relates to a signal receiving method and apparatus of a terminal in device-to-device wireless communication. In the present invention, a D2D reception terminal can measure a DM RS transmitted together with a PSBCH or detect energy with respect to the entirety of or a part of a symbol region through which the PSBCH or DM RS in a synchronization subframe can be transmitted so as to enable use as a criterion for determining whether to retry PSBCH decoding. When a DM RS measurement level or an energy detecting level is larger than a certain threshold value, the D2D reception terminal recognizes that the PSBCH has been transmitted and may retry the PSBCH decoding for a certain time or a certain number of times. When a DM RS measurement level or an energy detecting level is smaller than a certain threshold value, the D2D reception terminal recognizes that the PSBCH has not been transmitted and may not retry the PSBCH decoding. When the PSBCH decoding is not retried, the D2D reception terminal can try other PSSS/SSSS detection. Through the present invention, the D2D reception terminal can avoid inefficient operation of retrying the PSBCH decoding for a certain time or a certain number of times despite non-transmission of the PSBCH.
Abstract:
Provided are a communication method and system that combine IoT technologies with 5G communication systems supporting a higher data rate after 4G systems. The present disclosure may be applied to intelligent services, such as smart homes, smart buildings, smart cities, smart or connected cars, healthcare, digital education, retail businesses, and security and safety related services on the basis of 5G communication technologies and IoT related technologies. The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting uplink and downlink signals in a system supporting IoT terminals that perform transmission and reception using only one subcarrier. Specifically, there is provided a method including: allocating a resource for an IoT terminal; and exchanging a signal through a specific subcarrier of the resource between the IoT terminal and the base station supporting the IoT terminal.
Abstract:
The present disclosure relates to a communication method and a 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) is provided. 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 decoding method for a terminal is provided. The method includes receiving a downlink control channel, receiving a reference signal in respective physical resource block (PRB) pairs, performing a correlation operation between a first sequence for the received reference signal and a second sequence for a predetermined reference signal for decoding the downlink control channel, and performing decoding of a search space for the downlink control channel in the PRB pair determined based on a result of the correlation operation.
Abstract:
The present disclosure relates to a communication technique and a system thereof, which can combine a 5G communication system for supporting a higher data rate than that of a beyond 4G system with an IoT technology. The present disclosure may be applied to intelligent services on the basis of the 5G communication technology and 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 wireless communication system, in particular, a method and an apparatus for using downlink and uplink control channel transmission in a system that supports transmission/reception in a transmission timing interval that is shorter than 1 ms are provided to define physical channels that are necessary in the case of having a transmission timing interval that is shorter than 1 ms, in particular, a TTI of 1 OFDM symbol length, and to perform mapping of the physical channels on resource allocation and resource blocks.
Abstract:
Methods and apparatuses are provided for controlling power in a communication system. It is identified whether there is uplink transmission from a first UE. Sidelink transmission is transmitted from the first UE to a second UE based on a transmission power, if there is no uplink transmission from the first UE.
Abstract:
A communication method and apparatus of a terminal in a mobile communication system are provided. The method includes generating uplink control information for at least one activated cell; configuring, if the activated cell belongs to a Master Cell Group(MCG) under a control of a Master evolved Node B (MeNB), an uplink control channel based on the uplink control information of the activated cell belonging to the MCG; and transmitting the uplink control channel to a Primary Cell (PCell).
Abstract:
A method whereby a user equipment (UE) transmits hybrid automatic repeat request (HARQ) acknowledgement (ACK)/negative ACK (NACK) information corresponding to downlink data received from a corresponding base station (ENB) in a long term evolution-advanced (LTE-A) system supporting carrier aggregation (CA) is provided. When physical uplink shared channel (PUSCH) transmission is not scheduled at the time of transmission of HARQ ACK/NACK information, the UE transmits HARQ ACK/NACK information via physical uplink control channel (PUCCH). When PUSCH transmission is scheduled, the UE transmits HARQ ACK/NACK information multiplexed with PUSCH to the ENB. The amount of HARQ ACK/NACK information increases in proportion to the number of aggregated carriers. The present disclosure specifies scheduling operation of the ENB and HARQ ACK/NACK mapping of the UE that maintain reception performance of HARQ ACK/NACK and PUSCH when HARQ ACK/NACK information is multiplexed with PUSCH.
Abstract:
Methods and apparatus are provided for receiving a serving signal from a base station by a user equipment. A signal that includes the serving signal and an interference signal is received. A Log Likelihood Ratio (LLR) of the received signal is calculated according to each of a plurality of modulation orders applicable to the interference signal to obtain a plurality of LLR values. A modulation order of the interference signal is determined, based on the plurality of LLR values. The serving signal is reconstructed, based on the determined modulation order.
Abstract:
Methods and apparatus are provided for controlling transition of an operation state of a cell in a wireless communication system. The cell includes a transceiver configured to transmit and receive signals to and from a terminal and another cell. The cell also includes a controller configured to transition an operation state of the cell from an active state to a dormant state, transmit a discovery signal, determine whether a cell activation signal is received from a node that controls the cell, and transition the operation state of the cell from the dormant state to the active state when the cell activation signal is received.