Methods, systems, and devices for wireless communications are described. In some examples, a wireless communications system may support short reference signals for sidelink communication. A transmitting user equipment (UE) and a receiving UE may receive, from a base station, configuration signaling that indicates a set of sidelink resources that includes a set of slots within a subcarrier. A subset of the slots may include a first set of symbols allocated to a physical sidelink shared channel (PSSCH) and a second set of symbols allocated to a reference signal, where the first set of symbols comes before the second set of symbols in a time domain. The transmitting UE may transmit, to the receiving UE, a reference signal over the second set of symbols and the receiving UE may utilize the reference signal to decode data message received from the transmitting UE.

This disclosure provides systems, methods and apparatus, for measurement and reporting procedures associated with a sidelink positioning reference signal (SL-PRS). In one aspect, a first user equipment (UE), which may function as a sidelink anchor node, may transmit an SL-PRS to a second UE in accordance with a slot format or structure that is dedicated for SL-PRS transmissions. The first UE may select resources for the transmission of the SL-PRS via sensing and exclusion or using a set of resources that are dedicated for SL-PRS transmissions. The second UE may receive the SL-PRS and use the SL-PRS to acquire positioning information, in accordance with an observed time difference of arrival (OTDOA)-based positioning method, or may transmit a second SL-PRS to the first UE to facilitate acquisition of positioning information at the first UE, in accordance with a round-trip-time (RTT)-based positioning method.

A method and apparatus for transmitting positioning information in sidelink communication system is provided. A first wireless device determines positioning information of the first wireless device based on a position of the first wireless device. A first wireless device split the positioning information into first positioning information and second positioning information. A first wireless device transmits, to a second wireless device, the first positioning information via sidelink control information (SCI). A first wireless device transmits, to the second wireless device, the second positioning information via a data unit.

A method for supporting activation/deactivation of serving cells by a base station (BS) in a wireless communication system provides decreased overhead and decreased power consumption for a user equipment (UE). The method includes configuring M supportable serving cells in the UE, configuring an indicator indicating activation/deactivation of each of the M serving cells, configuring a medium access control (MAC) message which includes a MAC control element (CE) and a logical channel identifier (LCID), the MAC CE including the indicator configured for each of the M serving cells and having a length corresponding to an integer multiple of 8 bits, the LCID indicating that the MAC CE includes the indicator indicating activation/deactivation of each serving cell, and transmitting the configured MAC message to the UE. Accordingly, a control channel or data channel regarding a component carrier is selectively received depending on whether the component carrier is activated.

This disclosure relates to methods and devices for wireless sidelink resource allocation for a user equipment (UE) assisted by an anchor UE. Various mechanisms are disclosed for handling releasing of the anchor UE initiated by either the anchor UE or the assisted UE, and for handling sidelink resources already allocated to the UE by the anchor UE prior to the release. Additional mechanisms are disclosed for using an anchor UE to assist in allocating sidelink resources to multiple UEs configurable in a shared manner or non-shared manner.

A method for performing radio communication by a first apparatus, and an apparatus for supporting same may be provided. The method may comprise the steps of: obtaining second bits by attaching cyclic redundancy check (CRC) bits to first bits associated with second sidelink control information (SCI); obtaining third bits on the basis of channel coding for the second bits; obtaining fourth bits by performing rate matching on the third bits on the basis of the number of modulation symbols, wherein the number of modulation symbols is obtained on the basis of the number of first bits, the number of CRC bits, a beta-offset value included in first SCI associated with the second SCI, an alpha value configured for each resource pool, the number of symbols associated with transmission of a physical sidelink shared channel (PSSCH), the number of resource elements (Res) associated with transmission of the second SCI for each symbol, and a gamma value, the gamma value being the number of vacant REs in a resource block (RB) to which a last symbol associated with the second SCI belongs; and transmitting the second SCI to a second apparatus via the PSSCH on the basis of scrambling, modulation, and mapping for the fourth bits.

A method and device for data transmission. The method comprises: a first device determines configuration information of a first resource, where the configuration information of the first resource comprises: cycle information of the first resource and information of the first resource; the first device transmits the configuration information of the first resource to multiple second devices; and the first device multicasts first information to the multiple second devices via the first resource. With the first device transmitting the first information to the multiple second devices in a multicasting manner, compared with the transmission of information in a unicasting manner, the redundancy of data transmitted is reduced, and the transmission efficiency is increased.

The present invention provides a method performed by user equipment, and user equipment. The method includes: determining sidelink resource pool configuration information; and determining the number Q′.sub.SCI2 of coded modulation symbols of second stage SCI. The second stage SCI is second stage sidelink control information carried by a physical sidelink shared channel (PSSCH).

A communications device is provided. The communications device (which is a receiving communications device) comprises a transceiver configured to receive signals from and/or to transmit signals to one or more of a plurality of other communications devices within sidelink communications resources of a plurality of resource pool instances of a sidelink interface, each of the resource pool instances being arranged in time in accordance with a resource pool periodicity, the resource pool being formed of a plurality of time-divided slots and a plurality of frequency-divided regions, and a controller. The controller is configured in combination with the transceiver to exchange control signaling with a first transmitting communications device of the plurality of other communications devices. Here, the control signaling comprises an indication of a current power saving status of the receiving communications device.

A transmitting user equipment comprising: means for generating assistance information for a network node. The network node provides a grant of resources for sidelink communications between the transmitting and at least one receiving user equipment. The receiving user equipment is configured to operate in a discontinuous reception mode comprising a discontinuous reception cycle with an active time and an inactive time. The assistance information comprises a plurality of elements indicative of characteristics of the sidelink communications and at least one of the plurality of elements comprises an indication of the discontinuous reception mode of the receiving user equipment.