A communication apparatus includes a circuitry and a transmitter. In operation, the circuitry generates a Demodulation Reference Signal (DMRS) and generates downlink control information indicating a mapping pattern of the DMRS from a plurality of mapping patterns, and the transmitter transmits the DMRS and the downlink control information. The plurality of mapping patterns include a first mapping pattern and a second mapping pattern. Resource elements used for the DMRS of the second mapping pattern are same as a part of resource elements used for the DMRS of the first mapping pattern. A number of the resource elements used for the DMRS of the first mapping pattern is larger than a number of the resource elements used for the DMRS of the second mapping pattern.

A method including forming a reservation signal including a first part and a second part; and transmitting the reservation signal by a base station in a first cell on a channel during a portion of a first subframe until start of a next following subframe. The first part is configured to reserve the channel between the base station and a user equipment (UE). The second part includes downlink Orthogonal Frequency Division Multiplexing (OFDM) symbols carrying at least one of Physical Downlink Shared Channel (PDSCH), Demodulation Reference Signal (DMRS), Cell Specific Reference Signal (CRS), Physical Downlink Control Channel (PDCCH), or a same Transport Block (TB) as a PDSCH on the next following subframe, and the portion is less than the entire first subframe.

A method and apparatus are disclosed from the perspective of a transmitting device. In one embodiment, the method includes being configured or allocated with an identity, wherein the identity comprises a first part of the identity and a second part of the identity. The method also includes the transmitting device generating a data packet for sidelink transmission, wherein the data packet includes the second part of the identity. Furthermore, the method includes transmitting device generating a control information associated with the data packet, wherein the control information includes the first part of the identity. The method further includes the transmitting device transmits the control information and the data packet.

A device-to-device (D2D) communication method includes: performing, by a terminal device using a same packet data convergence protocol (PDCP) entity, D2D communication in a long term evolution (LTE) standard and a new radio (NR) standard.

Methods, systems, and devices for signaling in cast-type indication for a wireless communication system may include receiving, at a first user equipment (UE), a first stage sidelink control information (SCI) format from a second UE, decoding the first stage SCI format, determining a second stage SCI format using the decoded first stage SCI format, decoding the second stage SCI format, and determining a sidelink feedback status using the second stage SCI format. The sidelink feedback status may indicate whether sidelink feedback is enabled or not enabled. Second stage SCI content may include a distance setting associated with a communication range between the first UE and the second UE.

A method for information transmission includes that: the terminal device receives first information from a network device through a first time-domain resource on a first carrier, where the first time-domain resource is in a first downlink transmission burst and the first information is used to indicate time-domain resource information of a first transmission burst according to a first subcarrier spacing, and the first carrier is an unlicensed carrier; and the terminal device determines the time-domain resource information of the first transmission burst according to the first information, and the first carrier is an unlicensed carrier.

The present disclosure provides example communication methods and apparatuses. One example communication method includes generating first scheduling information and second scheduling information by a network device, where the first scheduling information indicates a downlink transmission parameter and a downlink time-frequency resource that are used by a target terminal device and at least one cooperation terminal device to receive first data from the network device, the second scheduling information indicates a sidelink transmission parameter and a sidelink time-frequency resource that are used by the at least one cooperation terminal device to send second data to the target terminal device, the second data is generated based on the first data. The downlink control information is sent by the network device to the target terminal device and the at least one cooperation terminal device, where the downlink control information includes the first scheduling information and the second scheduling information.

This disclosure relates to the set-up, activation, and deactivation of sidelink carrier aggregation, and includes a method and apparatus for transmitting or receiving a reference signal to a second UE on a designated sidelink component carrier as part of an initial beam scanning procedure; receiving a configuration message from a network entity indicating one or more additional sidelink component carriers for the first UE and the second UE; and communicating with the second UE via a sidelink corresponding to at least one of the one or more additional sidelink component carriers or the designated sidelink component carrier based on the configuration message on a sidelink beam pairing performed in the designated sidelink component carrier, wherein the first UE and the second UE are configured in coverage with the network entity.

An LAA-LTE wireless device obtains data to be transmitted in subframes over a shared spectrum. The wireless device transmits a reservation message over the shared spectrum. The reservation message indicates that an initial synchronization message will be retransmitted a specified number of times at specified intervals, such as with a predetermined number of subframes between each retransmitted synchronization message. The wireless device transmits the initial synchronization message over the shared spectrum.

A communication apparatus includes control circuitry and a transmitter. In operation, the control circuitry selects a Demodulation Reference Signal (DMRS) mapping pattern from among a plurality of DMRS mapping patterns. The DMRS mapping patterns include a first DMRS mapping pattern with first DMRS resource elements to which first DMRSs in a first half of a subframe are mapped and second DMRS resource elements to which second DMRSs in a second half of the subframe are mapped. Also, in operation, the transmitter transmits downlink control information that includes a plurality of bits indicating the selected DMRS mapping pattern.