A wireless communication system comprises a source node, a destination node, and a plurality of half-duplex relay nodes disposed between the source node and the destination node. The half-duplex relay nodes are configured in two disjoint paths each comprising an equal number of hops from the source node to the destination node. The source node is configured to alternately transmit information via the two disjoint paths in alternating time slots, and the destination node is configured to alternately receive information via the two disjoint paths in alternating time slots.

The present invention provides a method and device for transmitting/receiving an uplink signal. When a user equipment of the present invention is configured by multiple cell groups and multiple pieces of uplink control information (UCI) to be transmitted by the user equipment in a subframe are generated, the user equipment separately transmits, to the multiple cell groups, the UCI one by one from the piece of UCI having the highest priority, and drops the pieces of UCI having lower priorities among the multiple pieces of UCI.

The present disclosure relates to a pre-5.sup.th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4.sup.th-Generation (4G) communication system such as Long Term Evolution (LTE). The present disclosure provides a method of receiving downlink channel and/or downlink reference signal on an unlicensed band. An LTE user equipment (UE) receives control information of a cell operating on an unlicensed band, and receives downlink channel and/or downlink reference signal transmitted in the cell according to the control information. According to the present disclosure, data can be properly received on an unlicensed band.

The present disclosure relates to a pre-5.sup.th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4.sup.th-Generation (4G) communication system such as Long Term Evolution (LTE). The present disclosure provides a method of receiving downlink channel and/or downlink reference signal on an unlicensed band. An LTE user equipment (UE) receives control information of a cell operating on an unlicensed band, and receives downlink channel and/or downlink reference signal transmitted in the cell according to the control information. According to the present disclosure, data can be properly received on an unlicensed band.

One embodiment of the present specification provides a method by which a machine type communication (MTC) device configured to operate only in some bands among the system bands of a cell transmits a demodulation reference signal (DMRS) for the demodulation of uplink data. The method can comprise the steps of: selecting any one DMRS sequence among a plurality of sets of DMRS sequences having a length M according to a group hopping number and allocation area information of a sub-physical resource block (PRB), when an uplink signal is transmitted through the sub-PRB including the M number of subcarriers which is less than twelve subcarriers; and mapping the selected DMRS sequence on the M number of subcarriers of the sub-PRB, and transmitting the same.

The present invention provides a massive carrier aggregating method performed by a terminal in a wireless communication system, the method comprising the steps of: controlling a plurality of sounding reference signal (SRS) transmission powers with respect to a plurality of SRS cells to be triggered, respectively; and simultaneously transmitting a plurality of SRSs relating to the plurality of SRS cells to be triggered to a network, wherein the plurality of SRS transmission powers are different from each other.

The present invention provides an uplink signal transmission/receiving method and an apparatus therefor, and a downlink signal transmission/receiving method and an apparatus therefor. In a half duplex frequency division duplex (HD-FDD), when uplink transmission and downlink receipt are performed on the same subframe or neighboring subframes, a user equipment drops one of the uplink transmission and the downlink receipt according to a priority, and performs only transmission which is not dropped. The priority includes periodically unavailable resources, that is, aperiodic resources, taking priority over periodically available resources. If the uplink transmission is periodic, for example assigned in a semi-static manner or in a semi-persistent manner, and a downlink transmission is aperiodic, for example assigned dynamically, the user equipment drops the uplink transmission and performs the downlink receipt.

The present invention provides an uplink signal transmission/receiving method and an apparatus therefor, and a downlink signal transmission/receiving method and an apparatus therefor. In a half duplex frequency division duplex (HD-FDD), when uplink transmission and downlink receipt are performed on the same subframe or neighboring subframes, a user equipment drops one of the uplink transmission and the downlink receipt according to a priority, and performs only transmission which is not dropped. The priority includes periodically unavailable resources, that is, aperiodic resources, taking priority over periodically available resources. If the uplink transmission is periodic, for example assigned in a semi-static manner or in a semi-persistent manner, and a downlink transmission is aperiodic, for example assigned dynamically, the user equipment drops the uplink transmission and performs the downlink receipt.

Enhancement of long term evolution (LTE) time division duplex (TDD) carrier aggregation for half duplex user equipments (UEs) is discussed. In one aspect of enhanced TDD carrier aggregation, the UE monitoring for a control signal indicating subframe configuration for each TDD cell of an aggregated set of TDD cells in the same band. The UE may determine the downlink subframes and receive downlink transmissions on such subframes based on the control signal. In another aspect, the UE compares the number of scheduled uplink and downlink subframes between the TDD cells in the same band to determine the downlink error-control messaging timing for each cell.

A communication control method is disclosed, including: connecting, by a small cell by using a built-in soft SIM card or an inserted SIM card, to a Uu air interface of a macro cell to access the macro cell; after receiving a broadcast synchronization signal of the macro cell, synchronizing, by the small cell, with the macro cell, and acquiring configuration information of the macro cell; and performing, by the small cell, system configuration for the small cell according to the configuration information of the macro cell. A SIM card is added to the small cell, so that the small cell can access a macro cell in a terminal form, which is equivalent to addition of a Uu air interface between the small cell and the macro cell. Therefore, configuration management, performance optimization, admissible subscriber configuration, and the like are implemented for the small cell by using this air interface.