A radio frequency communication device (100) comprising a radio frequency communications interface (130) and a controller (110), wherein said controller (110) is configured to establish network communication with a network node (310) and to establish device-to-device communication with a second radio frequency communication device (325) via said radio frequency communication interface (130). The controller is further configured to determine whether there is to be performed a simultaneous transmission comprising a network transmission over said network communication with said network node (310) and a D2D transmission over said device-to-device communication with said second radio frequency communication device (325); determine if there is a transmission problem related to said simultaneous transmission; and if so determine a mitigation technique; and perform said network transmission and said D2D transmission according to said mitigation technique to mitigate said transmission problem.

The present invention relates to a communication technique for converging IoT technology with a 5G communication system for supporting a higher data transmission rate than that of a 4G system and subsequent systems, and a system thereof. The present invention can be applied to intelligent services on the basis of 5G communication technology and IoT-related technology (for example, smart home, smart building, smart city, smart car or connected car, health care, digital education, retail, security, and safety related services and the like). The present invention provides a method and a device for transmitting a synchronization signal for device-to-device (D2D) communication. According to the present invention, a first terminal receives a D2D synchronization signal (D2DSS) and a physical D2D synchronization channel (PD2DSCH) corresponding to the D2DSS from a second terminal, and transmits the D2DSS to the second terminal according to a method preassigned with the second terminal so as to indicate that the first terminal has successfully received the D2DSS or the PD2DSCH.

The present invention relates to a method by which a first device-to-device (D2D) terminal transmits a D2D signal in a wireless communication system, and a device therefor. More particularly, the method comprises the steps of: setting a D2D transmission power reference on the basis of a timing reference applied according to a D2D signal type; and transmitting a D2D signal to a second D2D terminal on the basis of D2D transmission power determined according to the D2D transmission power reference, wherein the D2D transmission power reference is configured using a power reference of a wide area network (WAN)-based physical uplink control channel (PUCCH) when the timing reference follows a downlink timing, and configured using a power reference of a WAN-based physical uplink shared channel (PUSCH) when the timing reference follows an uplink timing.

A user apparatus is provided. The user apparatus is used in a mobile communication system in which Device to Device (D2D) communications are supported. The user apparatus includes an acquisition unit configured to acquire transmission power information for D2D signal transmission at a transmission side user apparatus, and a distance estimation unit configured to measure reception power of a reference signal multiplexed with a D2D signal received from the transmission side user apparatus, and to estimate a distance between the transmission side user apparatus and the user apparatus from the reception power and the transmission power.

A method of power control for synchronization signals includes, at a wireless device, receiving a signal from an access point that is determinative of a power control mode of the wireless device for transmission of D2D synchronization signals. The method also includes transmitting, by the wireless device, D2D synchronization signals according to the power control mode. The power control mode may include a controlled power mode or a maximal power mode.

The embodiment of the present disclosure relates to a data transmission method and a terminal device. The method includes if a terminal device determines, according to first configuration information, to perform a first type of transmission on a target transmission resource, and determines, according to second configuration information, to perform a second type of transmission on the target transmission resource, the terminal device determines whether the first type of transmission or the second type of transmission is a target type of transmission according to a first preset rule, wherein the first type of transmission is sidelink transmission between the terminal device and another terminal device, and the second type of transmission is uplink transmission or downlink transmission between the terminal device and a network device; and performing data transmission on the target transmission resource by using the target type of transmission.

Systems and methods for device handshaking are described. Embodiments for client device and associated wearable device initiated handshaking are described. In certain embodiments, a device such as wearable camera eyeglasses having both high-speed wireless circuitry and low-power wireless circuitry communicates with a client device. The low-power wireless circuitry is used for signaling and to manage power on handshaking for the high-speed circuitry in order to reduce power consumption. An analysis of a high-speed connection status may be performed by a client device, and used to conserve power at the glasses with signaling from the client device to indicate when the high-speed circuitry of the glasses should be powered on.

The present invention provides a V2X operation method implemented by a V2X (vehicle-to-X) terminal in a wireless communication system, the method characterized by: receiving information which indicates that another communication is implemented on V2X resources; and transmitting a V2X message on the basis of the information, wherein a V2X terminal is a terminal having limited capability to detect the implementation of the other communication on the V2X resources.

The present disclosure is characterized by including the steps of: obtaining a resource pool for use in D2D communication in a wireless communication system, wherein the resource pool includes at least one of a scheduling assignment (SA) resource pool that represents a resource region to which the SA is transmitted, or a data resource pool that represents a resource region to which D2D data is transmitted; transmitting SA including information related to D2D data transmission to a second terminal through the SA resource pool; and transmitting D2D data to the second terminal.

Method and apparatus for monitoring the status and location of personnel using a remote timer. In some embodiments, a method includes logging in, through a network accessible device, a geo position of a subject to initiate a monitored session associated with the subject. A countdown timer of a remote server is initiated to denote a monitored time interval, the remote server in communication with the network accessible device over a network. A notification is generated and transmitted across the network to a monitoring device responsive to a conclusion of the monitored time interval.