A method for performing wireless communication by a first device is proposed in an embodiment. The method may comprise the steps of: selecting a synchronization source on the basis of a sidelink synchronization priority; acquiring synchronization on the basis of the synchronization source; transmitting a sidelink-synchronization signal block (S-SSB) to a second device on the basis of the acquired synchronization; transmitting, to the second device, information related to a pattern of a physical sidelink shared channel (PSSCH) demodulation reference signal (DMRS) for decoding a PSSCH through sidelink control information (SCI) on a physical sidelink control channel (PSCCH); mapping the PSSCH DMRS onto a time resource related to the PSSCH on the basis of the information related to the pattern of the SSCH DMRS and an interval of a time resource scheduled for transmission of the PSSCH related to the PSCCH; and transmitting the PSSCH DMRS to the second device through the PSSCH.

A communications network may include user equipment (UE) devices. When a first UE device becomes off-grid and has an emergency message, the first UE device may transmit device-to-device signals for receipt by a second UE device. The signals may include one or more preambles that precede the emergency message and that are used by the second UE device to perform synchronization with the first UE device. The second UE device may periodically activate a receiver during a series of windows to listen for the signals, may receive a preamble sequence during one of the windows, and may synchronize its timing to the first UE device for receipt of the emergency message based on the preamble sequence. This may allow the UE devices to be synchronized for transfer of the emergency message over long distances while consuming a minimal amount of power on the second UE device.

A system for updating vehicle time information includes a communication device configured to wirelessly communicate with a wireless network using a network communication protocol. The system also includes a processing unit configured to assess communications between the vehicle to determine whether a condition related to a potential local time offset error exists, and based on determining that the condition exists, transmit a message supported by the communication protocol to the wireless network. The message is configured to prompt the wireless network to return a response message including a local time offset. The process is also configured to update a vehicle local time record based on the local time offset.

A method and system for operating an ad hoc communication network under suboptimal commercial global navigation satellite system (GNSS) conditions and a loss of a base station communication link is disclosed. The method includes configuring the ad hoc communication network to operation in in-band or out-of-band mode, allowing device-to-device D2D communication. The method further includes configuring the ad hoc communication system to operate in overlay mode, sharing communication resources between network-controlled resources and D2D resources. The method further includes configuring the D2D resources with a base station precedent to the loss of the base station communication link and enabling the ad hoc communication network to operate in frequency hopping mode. The method further includes disabling physical sidelink control channel synchronization and/or resource management within the ad hoc communication network. In some embodiments of the method, and configuring the ad hoc communication network to include at least one nonstandard-GNSS time-synchronization method.

[Object] To provide innovation with respect to which synchronization signal a communication device uses to conduct a synchronization process. [Solution] Provided is a communication device including: a selection unit configured to select a synchronization signal from respective synchronization signals received from two or more other devices on a basis of origin information that is acquired by communication with another device and that indicates an origin of a synchronization signal used for acquisition of synchronization timing in the other device; and a synchronization processing unit configured to acquire synchronization timing using the synchronization signal selected by the selection unit.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a first set of synchronization signals from a first synchronization source and may receive a second set synchronization signals from a second synchronization source, where the UE determines a first priority for the first synchronization source based on a first identification (ID) associated with the first set of synchronization signals and a second priority for the second synchronization source based on a second ID associated with the second set of synchronization signals. Accordingly, the UE may then select the first synchronization source or the second synchronization source based on which synchronization source has a higher priority and communicate with the selected synchronization source (e.g., via sidelink communications).

An example system for a synchronizing audio on emergency vehicles can include a receiver configured to accept a synchronization signal. The example system can also include a processor configured to use the synchronization signal to determine a correct playback time for a message to remain in sync with other emergency vehicles.

Methods, systems, and devices for wireless communications are described in which synchronization of one or more direct communications links between a user equipment (UE) and one or more other UEs is provided by one or more sidelink synchronization signals. The sidelink synchronization signals may include a first sidelink synchronization signal that provides a relatively coarse synchronization (e.g., providing rough timing information about the start of the orthogonal frequency division multiplexing (OFDM) symbol, without providing any information identifying the source of the signal) that may be used to identify a search space for a second sidelink synchronization signal that provides relatively fine synchronization (e.g., identifying more precisely the OFDM symbol boundaries) and an identifier of the device that is transmitting the sidelink synchronization signals.

Sidelink synchronization facilitates providing timing reference for sidelink communications, including the transmitting of sidelink messages and/or the receiving of sidelink messages. Receive beams and transmission beams may change due to a change in the position and/or orientation of the transmitting wireless device. An apparatus for wireless communication at a wireless device determines a variable duration for a SLSS. The apparatus transmits the SLSS using the variable duration determined by the wireless device.

Presented herein are techniques for GPS attack prevention in association with wireless communication devices. In at least one embodiment, a method may include receiving, at a mobile device from a first access point (AP), first location information and one or more of a first token or first neighbor information relating to neighboring APs. The mobile device may receive from a second AP, second location information and one or more of a second token or second neighbor information relating to neighboring APs. The first token may be compared to the second token to determine whether the first and second tokens are consistent, and/or the first neighbor information may be compared to the second neighbor information to determine whether the first and second neighbor information are consistent. It may be determined whether the first location information provided by the first AP and the second location information provided by the second AP are valid based on the comparison(s).