This application discloses communication methods and apparatuses. In an example method, a physical layer protocol data unit (PPDU) is generated and sent. The PPDU includes multiple resource unit allocation subfields. The multiple resource unit allocation subfields include a resource unit allocation subfield corresponding to a multiple resource unit (MRU) to indicate that a 242-tone resource unit (RU) corresponding to the resource unit allocation subfield belongs to the MRU. A number of resource unit allocation subfields corresponding to the MRU in a resource unit allocation subfield corresponding to each 80 MHz subblock in a bandwidth for transmitting the PPDU is for determining or indicating a type of the MRU. A station can determine, based on the number of resource unit allocation subfields corresponding to the MRU in the resource unit allocation subfield corresponding to each 80 MHz subblock, which type of MRU is included in the bandwidth for transmitting the PPDU.

Embodiments of the invention provide a Space-Time coding device for encoding a digital data sequence according to a predefined space-time coding rate, said data sequence comprising a set of modulated symbols to be transmitted over at least two propagation modes, during a number of time slots, through an optical transmission channel in a single-core multimode optical fiber transmission system, wherein the device comprises: a codebook generator (53) configured to determine a set of codeword matrices defining a space-time code represented by a space dimension and a temporal dimension, each codeword matrix comprising complex values and a number of columns equal to said code temporal dimension, and a number of rows equal to said code space dimension, the codebook generator (53) being further configured to associate a difference codeword matrix and a distance metric to each pair of codeword matrices among said set of codeword matrices, each component of a difference codeword matrix associated with a given pair of codeword matrices being equal to the difference between the corresponding components of the codeword matrices of said pair, the distance metric associated with a given pair of codeword matrices being determined by computing the Euclidean norm of the difference codeword matrix associated with said pair, wherein the codebook generator (53) is configured to select the components of the codeword matrices depending on the number of pairs of codeword matrices that are associated with a unitary difference codeword matrix and with a distance metric equal to a given Euclidean distance; and an encoding unit (55) configured to encode said set of modulated symbols into a codeword matrix selected from said set of codeword matrices.

Various devices, methods, and processes are provided for handling conflicting and/or redundant power control and triggering information for transmitting reference signal(s) such as sounding reference signal (SRS) using carrier aggregation (CA). A user equipment (UE) receives a first downlink control information (DCI) and a second DCI including SRS control information that is in conflict with that of the first DCI, for controlling SRS transmission on a component carrier (CC). The UE determines a resolution to reconcile the conflict between the DCIs. Then the UE can transmit an SRS on the CC in accordance with the resolution.

The concepts relate to radio channel utilization. One example can channel bond a first available channel from a first radio frequency band with a second available channel from a second radio frequency band. The example can transmit a portion of a forward error correction coded data stream over the first available channel and a different portion of the forward error correction coded data stream over the second available channel.

This disclosure discloses methods and apparatuses for signal processing. In an implementation, a method comprises: generating first indication information, wherein the first indication information indicates L.sub.1 space domain vectors in a space domain vector set, K.sub.1 frequency domain vectors in a frequency domain vector set, and T.sub.1 space-frequency component matrices, wherein a precoding vector of one or more frequency domain units is determined by a weighted sum of the T.sub.1 space-frequency component matrices, wherein the L.sub.1 space domain vectors and the K.sub.1 frequency domain vectors correspond to M.sub.1 space-frequency component matrices that comprise the T.sub.1 space-frequency component matrices, wherein each of the M.sub.1 space-frequency component matrices is uniquely determined by a different combination of one of the L.sub.1 space domain vectors and one of the K.sub.1 frequency domain vectors; and sending the first indication information.

A method for determining a modulation and coding scheme is disclosed. The method is performed by a network device. The method includes: determining a quantity K of terminal devices that reuse a first time-frequency resource in a first time period to receive downlink data from the network device, where K≧2; obtaining a channel quality indicator (CQI), where the CQI is determined according to a signal to interference plus noise ratio (SINR) of a channel and the quantity K of the terminal devices, where the channel is a channel based on the first time-frequency resource, and the channel is used to transmit downlink data between a first terminal device and the network device in the first time period; and determining a Modulation and Coding scheme (MCS) of the first terminal device according to the CQI.

A method by which a terminal transmits an uplink signal in a wireless communication system, according to one embodiment of the present specification, comprises the steps of: receiving configuration information related to the transmission of the uplink signal; and transmitting the uplink signal on the basis of the configuration information. The configuration information includes a transmission configuration indicator state (TCI state). The uplink signal is transmitted on the basis of a specific panel and/or a specific spatial domain filter, according to the TCI state in which the panel ID and/or the reference RS is not configured.

A link between a PHY device and a link partner is established by performing link training. If the link becomes at least partially inoperable, a first fast retrain technique is executed. A signature indicating that the first fast retrain technique successfully began but failed during execution before completion of the first fast retrain technique is received at the PHY device. In response to receiving the signature, a second fast retrain technique is executed.

A radio communication node includes an upper node connecting unit, a lower node connecting unit, and a control unit that notifies an upper node or a network whether or not the upper node connecting unit and the lower node connecting unit are compatible with at least one of a space division multiplexing and a frequency division multiplexing.

A method performed by a user equipment (UE) in a wireless communication system, where the method includes: receiving, through higher layer signaling, uplink (UL)/downlink (DL) resource configuration including information regarding a first UL/DL resource pattern; determining, based on the received UL/DL resource configuration, the first UL/DL resource pattern that is applicable over a first configuration period; and based on the received UL/DL resource configuration also including information regarding a second UL/DL resource pattern: determining the second UL/DL resource pattern that is applicable over a second configuration period, wherein the first configuration period and the second configuration period are restricted to values such that an integer multiple of a sum of the first configuration period and the second configuration period is time-aligned with a 20 ms time duration.