A terminal apparatus for communicating with a base station apparatus includes a receiver configured to receive at least one synchronization signal burst periodically transmitted. A first synchronization signal and a second synchronization signal are mapped at a particular time position in a radio frame. Each of the at least one synchronization signal burst includes at least one synchronization signal block. Each of the at least one synchronization signal block includes at least one of the first synchronization signal, the second synchronization signal, or a physical broadcast channel. The receiver receives, from the base station apparatus, information for indicating the number of the at least one synchronization signal block included in each of the at least one synchronization signal burst.

Provided is a method and device for transmitting and receiving a Synchronization Signal block (SS-block). The method for transmitting the SS-block includes: configuring the SS-block in an NR unlicensed spectrum, wherein the SS-block occupies x OFDM symbols, with x being a positive integer no greater than 4; and transmitting the S S-block to a user equipment with a preset or configured subcarrier spacing. By this method, during the configuration of SS-block, the SS-block occupies x Orthogonal Frequency Division Multiplexing symbols. If the SS-block occupies a relatively small number of symbols, it is possible to reduce the duty cycle of DRS. In other words, it is possible to shorten the transmission duration of the SS-block, so as to reduce the time that the SS-block occupies the channel in the unlicensed spectrum.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a first synchronization signal (SS) block that does not include remaining minimum system information (RMSI). The first SS block may indicate an offset for obtaining a second SS block that includes RMSI. The UE may determine a location of the second SS block based at least in part on the offset. Numerous other aspects are provided.

Methods, systems, and devices for wireless communication are described. In some cases, due to blind decoding and channel estimation (CE) limits, one or more user equipment (UE) specific search sets may be pruned for blind decoding and/or CE purposes. For instance, after hashing a set of common decoding candidates to control channel elements (CCEs) within the control region, the UE specific search sets may be pruned so as to conform to the blind decode limitation, since a common search space has already occupied a portion of the total blind decode limit. Following pruning, the UE may hash the sets of UE-specific decoding candidates associated with the one or more UE specific search sets to CCEs within the control region. The UE may further prune UE specific search sets, based on CE limits, while reusing CE for overlapping hashed locations.

In one aspect of the present invention, user equipment includes a reception unit configured to receive first system information in a frequency block where a synchronization signal is placed and third system information in another frequency block; and a control unit configured to stop detecting the synchronization signal, (1) when a control channel search space for receiving second system information does not exist based on a parameter value determined from the first system information and (2) when the control channel search space for receiving the second system information does not exist based on a parameter value determined from the third system information.

Methods, systems, and devices for wireless communication are described. In some cases, due to blind decoding and channel estimation (CE) limits, one or more user equipment (UE) specific search sets may be pruned for blind decoding and/or CE purposes. For instance, after hashing a set of common decoding candidates to control channel elements (CCEs) within the control region, the UE specific search sets may be pruned so as to conform to the blind decode limitation, since a common search space has already occupied a portion of the total blind decode limit. Following pruning, the UE may hash the sets of UE-specific decoding candidates associated with the one or more UE specific search sets to CCEs within the control region. The UE may further prune UE specific search sets, based on CE limits, while reusing CE for overlapping hashed locations.

A method of indicating a position of a cell-defining SSB includes: acquiring on-off indication information set in a physical broadcast channel (PBCH) of a non-cell-defining SSB, where the on-off indication information is a first value or a second value. In response to that the on-off indication information is the first value, the base station sets SSB position indication information in the PBCH to indicate a position of a raster or a raster group in which a cell-defining SSB is located. In response to that the on-off indication information is the second value, the base station sets gap indication information in the PBCH to indicate that there is no cell-defining SSB within a range of a current frequency band. The range has a length of a gap value and is centered at a position of the current SSB; and sending the SSB to user equipment (UE).

In one aspect of the present invention, user equipment includes a reception unit configured to receive first system information in a frequency block where a synchronization signal is placed and third system information in another frequency block; and a control unit configured to stop detecting the synchronization signal, (1) based on a parameter value determined from the first system information, (1-1) when a control channel search space for receiving second system information does not exist and (1-2) when the parameter value is within a predetermined range and (2) when the control channel search space for receiving the second system information does not exist based on a parameter value determined from the third system information.

The present disclosure provides an operation method of a terminal and a base station in a wireless communication system supporting an unlicensed band, and an apparatus supporting same. As a specific example, the present disclosure comprises an operation method of a terminal and an operation method of a base station corresponding thereto, by which a terminal can obtain timing information relating to a unlicensed band on the basis of a PBCH payload in a synchronization signal/physical broadcast channel (SS/PBCH) block and a demodulation reference signal (DMRS) sequence for the PBCH.

The present invention discloses a method for a user equipment to receive system information in a wireless communication system. Particularly, the method is characterized in detecting a first synchronization signal block configured with a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS) and a Physical Broadcasting Channel (PBCH) at a specific frequency position, determining a presence or non-presence of system information corresponding to the first synchronization signal block within a first synchronization raster corresponding to a specific frequency position based on a system information indicator included in the PBCH, and if the system information corresponding to the first synchronization signal block is determined as not existing, determining a second synchronization raster having system information exist therein based on the system information indicator.