Abstract: This application relates to a configuration method and a communication apparatus. The configuration method includes: receiving first configuration information from a network device, where the first configuration information is used to configure a plurality of first channel bandwidths; and receiving second configuration information from the network device, where the second configuration information is used to configure a plurality of first bandwidth parts BWPs, the plurality of first BWPs include at least two second BWPs with a same SCS, and the SCS of the second BWP is the same as the SCS corresponding to the second channel bandwidth. According to the configuration method of this application, a terminal device may determine a plurality of associated BWPs (namely, BWPs with a same SCS) in a channel bandwidth configured by the network device, to reduce a switching delay of the terminal device switching between two associated BWPs.

Abstract: This application provides a communication method and a communication apparatus. The method includes: sending first configuration information to a plurality of terminal devices, where the first configuration information is used to configure the plurality of terminal devices to detect paging early indication information on a first bandwidth unit, and the paging early indication information indicates to detect or not to detect paging indication information; and sending a reference signal on the first bandwidth unit, where the reference signal is used by the plurality of terminal devices to perform time synchronization and/or frequency synchronization with a network device, to reduce power consumption of a terminal device.

Abstract: A low-computation underwater acoustic wake-up method based on a multi-carrier signal is provided. A multi-carrier signal corresponding to communication nodes is constructed, absolute values of the multi-carrier signal in a window at a receiver are summed for signal arrival detection, and then frequency points of the multi-carrier signal are detected many times by using the real fast Fourier transform to realize wake-up detection. The method is suitable for accurate wake-up at any distance within a maximum communication distance of two underwater acoustic nodes, has a small amount of calculation, and is suitable for low-power single-chip microcomputers. The modem can be in a low-power sleep state for a long time.

Abstract: Embodiments of this application disclose a three-dimensional audio signal processing method and apparatus, to implement sound field classification of a three-dimensional audio signal, to accurately identify the three-dimensional audio signal. An embodiment of this application provides a three-dimensional audio signal processing method, including: performing linear decomposition on a current frame of a three-dimensional audio signal, to obtain a linear decomposition result; obtaining, based on the linear decomposition result, a sound field classification parameter corresponding to the current frame; and determining a sound field classification result of the current frame based on the sound field classification parameter.

Abstract: Computer-readable media, methods, and systems are disclosed for utilizing partition-based locking mechanisms to improve execution of overlapping data definition language (DDL) and data manipulation language (DML) operations on a partitioned database table. A first node receives a DML statement associated with a first transaction. The first node acquires a intent exclusive lock on table metadata. A second node receives a DDL statement associated with a second transaction and acquires an exclusive metadata lock on the partitioned table metadata. Next, an intent exclusive lock is acquired for the relevant partition table data on the second node and an exclusive lock on table metadata on the second node. The second transaction waits for the DML operation of the first transaction to complete. Then the first transaction is committed. Finally exclusive locks are acquired on table data and metadata and the second transaction is executed and committed.

Abstract: A double-deck rail vehicle and a vehicle body thereof are provided. An underframe (11) of the vehicle body comprises a lower-layer underframe (111), end underframes (112, 115), sealing plates (114, 116), and side underframes (118, 119); wherein the lower-layer underframe is provided with an underframe middle beam (1111); the end underframe is fixedly connected to the underframe middle beam by means of reinforcement middle beams (113, 117); the sealing plate is fixedly connected between the end underframe and the lower-layer underframe; and the side underframe comprises side beams (1181, 1191) of the side underframe that are integrated, and the side underframe is fixedly connected to the end underframe by means of the side beams of the side underframe. The vehicle body supplements the reinforcement middle beams capable of increasing the connection strength between the end underframe and the lower-layer underframe, and uses the integrated side beams of the side underframe.

Abstract: This application discloses a three-dimensional audio signal coding method and apparatus, and an encoder, and relates to the multimedia field. The method includes: After determining a first quantity of virtual speakers and a first quantity of vote values based on a current frame of a three-dimensional audio signal, a candidate virtual speaker set, and a voting round quantity, the encoder selects a second quantity of representative virtual speakers for the current frame from the first quantity of virtual speakers based on the first quantity of vote values, and further encodes the current frame based on the second quantity of representative virtual speakers for the current frame to obtain a bitstream. This achieves efficient data compression.

Abstract: A three-dimensional audio signal coding method, apparatus, and encoder are described. The method includes, after obtaining a first correlation between a current frame of a three-dimensional audio signal and a representative virtual speaker set for a previous frame, the encoder determines whether the first correlation satisfies a reuse condition, where the first correlation is used to determine whether to reuse the representative virtual speaker set for the previous frame when the current frame is encoded. The method further encodes the current frame based on the representative virtual speaker set for the previous frame when the first correlation satisfies the reuse condition, to obtain a bitstream. A virtual speaker in the representative virtual speaker set for the previous frame is a virtual speaker used for encoding the previous frame of the three-dimensional audio signal.

Abstract: Computer-readable media, methods, and systems are disclosed for database table partition pruning based on statistical information associated with non-partition columns. A tree partition specification is received defining partitions for a plurality of computed column statistics. Respective partitions are created for the plurality of computed column statistics based on the tree partition specification. A request is received to compute statistics for a plurality of columns of the plurality of computed column statistics to result in a plurality of computed column statistics. In response to determining that one or more modifications have been made to the partitioned database, the plurality of computed column statistics is marked as invalid. The computed column statistics are refreshed in response to modifications of the partitioned table. Thereafter, the statistics are marked as valid. Unnecessary table partitions are pruned based on the statistics, and the associated query is executed.

Abstract: Computer-readable media, methods, and systems are disclosed for linear interval-based dynamic range partitioning in one or more database systems. A request is received by a database management system to insert a new row into a partitioned database table. The partitioned database table may include a plurality of existing partitions and a partition others partition. Based on determining that the new row should be inserted into the partition others partition a series of steps are performed. First, one or more new partitions are added to the partitioned database table. Then, the new row is inserted into the one of the one or more new partitions in the partitioned database table.

Abstract: Computer-readable media, methods, and systems are disclosed for utilizing partition-based locking mechanisms to improve execution of overlapping data definition language (DDL) and data manipulation language (DML) operations on a partitioned database table. A first node receives a DML statement associated with a first transaction. The first node acquires a intent exclusive lock on table metadata. A second node receives a DDL statement associated with a second transaction and acquires an exclusive metadata lock on the partitioned table metadata. Next, an intent exclusive lock is acquired for the relevant partition table data on the second node and an exclusive lock on table metadata on the second node. The second transaction waits for the DML operation of the first transaction to complete. Then the first transaction is committed. Finally exclusive locks are acquired on table data and metadata and the second transaction is executed and committed.

Abstract: Computer-readable media, methods, and systems are disclosed for database table partition pruning based on statistical information associated with non-partition columns. A tree partition specification is received defining partitions for a plurality of computed column statistics. Respective partitions are created for the plurality of computed column statistics based on the tree partition specification. A request is received to compute statistics for a plurality of columns of the plurality of computed column statistics to result in a plurality of computed column statistics. In response to determining that one or more modifications have been made to the partitioned database, the plurality of computed column statistics is marked as invalid. The computed column statistics are refreshed in response to modifications of the partitioned table. Thereafter, the statistics are marked as valid. Unnecessary table partitions are pruned based on the statistics, and the associated query is executed.

Abstract: A method may include generating a database table to include a first partition having a first range and a dynamic partition associated with an undefined range of a specified length. A record may be inserted into the database table. In response to one or more values of the record being outside of the first range of the first partition, a second partition having a second range of the specified length that includes the one or more values of the record may be generated. The record may be stored in the second partition. Moreover, a query on the database table may be executed by the first partition and/or the second partition of the database table. Related systems and articles of manufacture are also provided.

Abstract: A method for processing a query may include evaluating a query on a database table to identify a time based function included in the query. One or more partitions of the database table may be pruned from the query based at least on the partitions being associated with a first time range that does not overlap with a second time range associated with the time based function. An execution plan for the query may be generated to include a sequence of operations that avoids accessing the one or more partitions pruned from the query. The query may be executed based at least on the execution plan by at least accessing a second partition of the database table but not the first partition of the database table pruned from the query. Related systems and articles of manufacture are also provided.

Abstract: A method may include generating a database table to include a first partition having a first range and a dynamic partition associated with an undefined range of a specified length. A record may be inserted into the database table. In response to one or more values of the record being outside of the first range of the first partition, a second partition having a second range of the specified length that includes the one or more values of the record may be generated. The record may be stored in the second partition. Moreover, a query on the database table may be executed by the first partition and/or the second partition of the database table. Related systems and articles of manufacture are also provided.

Abstract: A double-deck rail vehicle and a vehicle body thereof are provided. An underframe (11) of the vehicle body comprises a lower-layer underframe (111), end underframes (112, 115), sealing plates (114, 116), and side underframes (118, 119); wherein the lower-layer underframe is provided with an underframe middle beam (1111); the end underframe is fixedly connected to the underframe middle beam by means of reinforcement middle beams (113, 117); the sealing plate is fixedly connected between the end underframe and the lower-layer underframe; and the side underframe comprises side beams (1181, 1191) of the side underframe that are integrated, and the side underframe is fixedly connected to the end underframe by means of the side beams of the side underframe. The vehicle body supplements the reinforcement middle beams capable of increasing the connection strength between the end underframe and the lower-layer underframe, and uses the integrated side beams of the side underframe.