A method for receiving Channel State Information (CSI) by a base station (BS) in a wireless communication system, includes receiving an encoded value for a specific CSI report mode, wherein the encoded value is joint encoded value of a rank indicator (RI) and a first precoding matrix indicator (PMI), obtaining the RI and a codebook index for the first PMI based on the encoded value, wherein the RI and the first PMI are jointly encoded into the encoded value in a way that following conditions are satisfied: when the encoded value is an integer ranging from 0 to 7, the RI is 1 and a codebook index for the first PMI is same as the encoded value, and when the encoded value is integer ranging from 8 to 15, the RI is 2 and the codebook index for the first PMI is the encoded value minus 8.

For multiplexing channel state information (CSI), a user equipment (UE) includes a transceiver configured to receive configuration information for CSI reporting and a processor configured to decode the configuration information and calculate a CSI according to the configuration information. The transceiver is configured to transmit the calculated CSI on an uplink (UL) channel, where the CSI includes N segments and is transmitted in one slot, where N>1. A first of the N segments includes a rank indicator (RI) and at least one other CSI parameter. A base station (BS) includes a processor configured to generate configuration information for CSI reporting and a transceiver configured to transmit, to a UE, the configuration information via a downlink (DL) channel; and receive, from the UE, a CSI report calculated in accordance with the configuration information on an uplink UL channel.

A channel state information request requesting a device to feedback channel state information can be received. Whether the channel state information request corresponds to regular latency based operation or reduced latency based operation can be determined. Channel state information can be derived based on a first reference resource when the channel state information request corresponds to regular latency based operation. Channel state information can be derived based on a second reference resource when the channel state information request corresponds to reduced latency based operation. The reduced latency based operation can have a latency less than the regular latency based operation. The derived channel state information can be reported to a network.

Embodiments of this application relate to the field of communications technologies, and disclose a precoding matrix configuration method and apparatus, to help improve performance of decoding data. The method may include: receiving first configuration information, where the first configuration information is used to configure M precoding matrices, M≥2, and M is an integer; and aggregately sending a signal in N time domain units based on the first configuration information, where the signal is a signal obtained after precoding is performed by using a precoding matrix corresponding to each of the N time domain units, the precoding matrix corresponding to each time domain unit is one of the M precoding matrices, N≥2, and N is an integer.

Provided is a mechanism capable of allowing signals transmitted by use of different communication methods classified as V2X communication to appropriately coexist in a resource pool. A terminal apparatus for performing communication using any of communication methods classified as vehicle to X (V2X) communication, the terminal apparatus including: an acquisition unit that acquires allocation information regarding allocation of a first resource pool and setting information regarding priority use of the first resource pool, the first resource pool being available to a plurality of terminal apparatuses using the different communication methods classified as V2X communication; and a transmission processing unit that performs a process of packet transmission using the first resource pool on the basis of the communication method of the terminal apparatus itself, the allocation information, and the setting information regarding priority use.

Methods and apparatus for channel detection in an uplink shared control channel. In an exemplary embodiment, a method includes generating soft-combined bit streams for an acknowledgement (ACK) indicator, rank indicator (RI), and channel quality indicator (CQI) received in an uplink shared channel. The method also includes decoding the ACK, RI, and CQI soft-combined bit streams to generate Top-M decoded bit streams for each indicator, and generating Top-Q symbols for each indicator from the Top-M decoded bit streams for each indicator. The method also includes calculating metrics from the Top-Q symbols and uplink control information (UCI) symbols extracted from the uplink shared channel, combining the metrics to form a search space, and searching the search space to determine transmitted ACK, RI, and CQI bits.

A client terminal sends a signal to a wireless access device. The wireless access device receives the signal, determines channel state information corresponding to the client terminal according to identity information of the client terminal in the signal, and calculates data sent by the client terminal according to the channel state information and the signal. The client terminal sends a request signal for acquiring channel state information, wherein the request signal includes identity information of the client terminal. The wireless access device receives the request signal, obtains the channel state information corresponding to the client terminal according to the identity information of the client terminal in the request signal, and sends the obtained channel state information to the client terminal. The client terminal receives the channel state information and the signal and calculates the data sent to the client terminal according to the channel state information and the signal.

A method and system are provided for scheduling data transmission in a Multiple-Input Multiple-Output (MIMO) system. The MIMO system may comprise at least one MIMO transmitter and at least one MIMO receiver. Feedback from one or more receivers may be used by a transmitter to improve quality, capacity, and scheduling in MIMO communication systems. The method may include generating or receiving information pertaining to a MIMO channel metric and information pertaining to a Channel Quality Indicator (CQI) in respect of a transmitted signal; and sending a next transmission to a receiver using a MIMO mode selected in accordance with the information pertaining to the MIMO channel metric, and an adaptive coding and modulation selected in accordance with the information pertaining to the CQI.

The invention relates to a transmitting device, which performs a resource sensing procedure to acquire information about radio resources usable for transmitting data at a later point in time. After data becomes available for transmission, the transmitting device performs an autonomous radio resource allocation to select radio resources within a transmission window to be used for transmitting the data, based on the information acquired by the resource sensing procedure during a sensing window. The autonomous radio resource allocation comprises selecting radio resources in primary subframes of the transmission window preferably over radio resources in secondary subframes of the transmission window. The secondary subframes correspond to those subframes in the sensing window during which the transmitting device did not perform the resource sensing procedure, and the primary subframes correspond to those subframes in the sensing window during which the transmitting device did perform the resource sensing procedure.

A channel selection method and a transmit end are provided. The method includes: ranking multiple channels, and generating a backoff count value; sequentially decrementing, from an initial timeslot, the backoff count value in each timeslot according to a ranking sequence of the channels and busy/idle states of all the channels until the backoff count value is 0; and selecting, from the multiple channels according to a result of the decrement performed on the backoff count value and a busy/idle state of at least one of the multiple channels, a channel that is used by the transmit end for sending data. The method and the transmit end can improve channel utilization.