Disclosed are a method for transmitting and receiving a synchronization signal in a wireless communication system and an apparatus therefor. Specifically, a method for performing synchronization signal by transmitting and receiving a synchronization signal includes: receiving, from a base station, a primary synchronization signal (PSS) and a secondary synchronization signal (SSS); and performing synchronization by using the received PSS and the received SSS, in which a sequence for the SSS may be generated by a product between a first sequence and a second sequence and the number of first sequences may be configured to be larger than the number of second sequences.

The present invention discloses a method of transmitting an SSS (secondary synchronization signal), which is transmitted by a base station, in a wireless communication system. The method includes the steps of determining a first shift based on a first and a second cell identifiers for identifying a cell, and determining a second shift index based on the first cell identifier and transmitting the SSS using a first sequence which is generated based on the first shift index and a second sequence which is generated based on the second shift index. In this case, the first shift index can be determined as K times a value determined based on the first and second cell identifiers, where K is an integer equal to or greater than 3.

Inventive concepts and embodiments associated therewith are provided wherein a first device transmits first information to a destination device using a first band of frequencies comprising microwave frequencies and cellular frequencies while a second device, that comprises a connection to the first device, transmits second information to the destination device using a second band of frequencies that differs from the first band of frequencies, is devoid of cellular frequencies and comprises microwave frequencies. In some embodiments, the connection of the second device to the first device comprises a wireless connection. In further embodiments, at least one of said first and second devices comprises a smartphone.

The present document relates to a method for transmitting a signal using a long sequence in a wireless communication system. According to the method, a transmission side device transmits a signal using the long sequence comprising a combination of a plurality of sub-subsequences, wherein each of the plurality of sub-subsequences comprises a combination of a plurality of short base sequences, each having a length equal to or shorter than a predetermined length, and sequences obtained by multiplying each of the base sequences by a cover sequence.

Embodiments of the present invention relate to the communications field and provide a group communications method, device, and system to reduce a waste of an uplink resource and a downlink resource. The method may include obtaining, by a group communications server, group communication data to be sent by first user equipment and a cell identifier of a first cell, wherein the first cell provides a service for the first user equipment; obtaining, by the group communications server according to the cell identifier of the first cell, a group identifier of a first mobile group corresponding to the cell identifier of the first cell from a first preset correspondence; and sending, by the group communications server, the group communication data to a user equipment in the first mobile group other than the first user equipment according to the group identifier of the first mobile group.

Provided is an anti-interference method and system. The anti-interference method includes: setting an orthogonal code division sequence according to a subcarrier position in a frequency domain of resource elements (REs) of a data channel in at least one sub-frame; and configuring transmitting frequency domain symbols of the REs by using the orthogonal code division sequence corresponding to the subcarrier position of the REs.

A method for a base station processing an in-band emission interference signal caused when the base station operating in a Full Duplex Radio (FDR) mode transceives signals using a Frequency Division Multiplexing (FDM) manner includes transmitting a downlink signal in a flexible downlink duration of an uplink band; and processing the in-band emission interference signal caused by transmission of the downlink signal in an uplink duration of the uplink band, wherein the processing of the in-band emission interference signal is performed by puncturing a corresponding resource of the uplink duration, wherein the resource on the downlink signal is transmitted is mirrored to the corresponding resource of the uplink duration from a Direct Current (DC) subcarrier as a reference.

Aspects of the disclosure provide a method for radio resource management (RRM) measurement and channel estimation. The method can include receiving first reference signals of a first system in a wireless communication network at a user equipment (UE), receiving second reference signals of a second system in the wireless communication network at the UE, receiving a quasi-co-location (QCL) configuration from one of the first system and the second system, the QCL configuration indicating the first reference signals and the second reference signals are quasi-co-located (QCLed) or co-located, and performing an RRM measurement and/or a channel estimation based on a combination of the QCLed first reference signals and second reference signals.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit a random access preamble to a base station as part of a two-step random access procedure. The UE may generate the preamble by identifying a discrete Fourier transform (DFT) matrix and generating a set of sequences based on the DFT matrix. Each sequence of the set of sequences may be generated by selecting a column of the DFT matrix and performing deterministic sampling of respective entries from the selected column in accordance with a sampling function. The UE may then select a sequence from the set of sequences based on generating the set of sequence. The UE may transmit the selected sequence to a wireless device (e.g., a base station).

A terminal is disclosed that includes a first transmitter configured to transmit control information for D2D by using a physical control channel for D2D multiplexed with a physical data channel for D2D in a frequency domain and a second transmitter configured to transmit data corresponding to the control information for D2D by using the physical data channel for D2D, where a plurality of the control information for D2Ds are mapped in a wireless resource unit. In other aspects, another terminal is also disclosed.