A reception device includes: a receiver that receives a multiplexed signal; a first demapper that demaps the multiplexed signal, with a second modulated symbol stream of a second data series being included in the multiplexed signal as an undefined signal component, to generate a first bit likelihood stream of a first data series; a second demapper that demaps the multiplexed signal, with a first modulated symbol stream of the first data series being included in the multiplexed signal as an undefined signal component, to generate a second bit likelihood stream of the second data series; a first decoder that performs error control decoding on the first bit likelihood stream to derive the first data series; and a second decoder that performs error control decoding on the second bit likelihood stream to derive the second data series.

A wireless communication method and system are provided in which an uplink data stream that has uplink data associated with a user device is received. Channel performance data based at least in part on a portion of the uplink data stream is determined. A determination is made whether the channel performance data meets a predetermined performance level. The portion of the uplink data stream is discarded when the channel performance data does not meet the predetermined performance level. The portion of the uplink data stream is tagged for additional processing when the channel performance data meets the predetermined performance level.

The present invention relates to a variety of hybrid automatic repeat request (HARQ) methods, data buffering methods therefor, and apparatuses supporting the methods, in a wireless access system supporting a non-orthogonal multiple access (NOMA) scheme. As one embodiment of the present invention, a data buffering method, by a first terminal, for hybrid automatic repeat request (HARQ) in a wireless access system supporting a non-orthogonal multiple access (NOMA) scheme may comprise: a step of receiving, from a base station, data in which data for the first terminal and a second terminal are multiplexed in a NOMA scheme; a step of decoding the multiplexed data; a step of buffering data for the second terminal; and a step of transmitting HARQ-ACK information to the base station, depending on the decoding result.

Embodiments of this disclosure provide a method and apparatus for transmitting a signal and a communications system. The method includes: superimposing, by a transmitting device, symbols which are to be transmitted to multiple pieces of user equipment, to form a superimposed symbol; performing phase rotation on the superimposed symbol to form a rotated symbol; and transmitting the superimposed symbol by using a first antenna and transmitting the rotated symbol by using a second antenna. With the embodiments of this disclosure, channel conditions of multiple pieces of user equipment may be differentiated, and gains of NOMA in a microcell may be fully brought into play.

Various arrangements for performing uplink grant-free transmissions are presented herein. An instance of user equipment (UE) may determine data that is to be transmitted using a grant-free (GF) uplink transmission to a base station of a cellular network. The UE may select a first GF resource block and a second GF resource block. The UE may transmit GF transmissions that comprise: a data payload and a first pointer at the first GF resource block; and the data payload and a second pointer at the second GF resource block. The first pointer may refer to the second GF resource block, while the second pointer may refer to the first GP resource block.

A combined symbol constellation may be selected from a uniform symbol constellation that is supported by a de-mapper to provide additional power split options while reducing modifications to the de-mapper. In some examples, a signal may be constructed according to a combined symbol constellation selected from a larger uniform symbol constellation based on a desired power-ratio. The signal may include a base-layer, used to communicate a first set of data, and an enhancement-layer, used to communicate a second set of data, in accordance with the selected combined symbol constellation. The signal may be received and de-mapped according to the combined symbol constellation at a de-mapper that supports a uniform symbol constellation that is larger than the combined symbol constellation.

A method of assigning transmission resources by an access node includes allocating first transmission resources to a first device, and allocating second transmission resources to a second device, wherein the second transmission resources partially, but not completely, overlap the first transmission resources. An amount of overlap between the first transmission resources and the second transmission resources may be based on a target error rate for decoding transmissions received from the first device and the second device and/or a signal to interference plus noise ratio (SINR) of transmissions from the first device and the second device. Related access nodes are disclosed.

A disclosure of the present specification provides a method for determining whether to drive a symbol level interference canceller on the basis of a network support. The method comprises the steps of: determining whether to turn on the symbol level interference canceller on the basis of condition information on at least one between a serving cell and an interference cell; driving the symbol level interference canceller according to the determination; and determining whether to turn off the symbol level interference canceller, when the condition information has changed, while driving the symbol level interference canceller.

The present disclosure relates to a 5G or a pre5G communication system to be provided for supporting a higher data transmission rate after 4G communication systems, such as LTE. According to embodiments of the present invention, a method and an apparatus for receiving signals in a mobile communication system may be provided, the method comprising the steps of: receiving a second signal including an interference signal of a first signal transmitted by a first terminal and a first signal transmitted by a second terminal; obtaining information related to the interference signal; removing the interference signal on the basis of the obtained information; and decoding the first signal after removing the interference signal from the second signal, wherein the information related to the interference signal includes resource block allocation information with respect to the interference signal and/or a reference signal for demodulating the interference signal.

A non-orthogonal multiple access (NOMA) scheme data receiving method is provided. The method can comprise the steps of: receiving, by a user equipment (UE), downlink control information (DCI) for a NOMA scheme; receiving downlink data on the basis of the DCI; decoding interference data included in the received downlink data; cancelling decoded interference data in the received downlink data if the decoding is successful; and decoding the own downlink data remaining after the interference data has been cancelled.