The present disclosure relates to a communication technology for combining, with IoT technology, a 5G communication system for supporting a higher data transmission rate than a 4G system, and to a system therefor. The present disclosure may be applied to intelligent services, such as smart homes, smart buildings, smart cities, smart cars or connected cars, health care, digital education, retail, and security and safety related services, on the basis of 5G communication technologies and IoT-related technologies. The present invention may provide a method and apparatus by which a base station provides instructions on time and frequency offset information to a UE so as to correct the time and frequency by a value offset from the provided time and frequency offset information.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a first reference signal from a first transmission reception point (TRP) and a second reference signal from a second TRP. The UE may estimate a first Doppler shift associated with the first TRP based on receiving the first reference signal and may estimate a second Doppler shift associated with the second TRP based on receiving the second reference signal. In some cases, the UE may receive a first Doppler pre-compensated downlink transmission from the first TRP and a second Doppler pre-compensated downlink transmission from the second TRP based on a Doppler pre-compensation indication that indicates whether the downlink transmissions are Doppler pre-compensated.

Methods, systems, and devices for wireless communications are described. For instance, a user equipment (UE) may receive and measure a reference signal received from a node and may transmit, to the node, a channel feedback report using a resource, the channel feedback report including a first Doppler shift associated with measuring the reference signal. In some examples, the uplink resource may be one of a set of uplink resources indicated to the UE, and the uplink resource may be based on a mobility parameter associated with the UE. Additionally or alternatively, the UE may measure a second reference signal received from the node and may transmit, to the node, a second channel feedback report using a second resource, where the second resource is based on measuring the first reference signal and where the second channel feedback report includes a second Doppler shift associated with measuring the second reference signal.

Disclosed are a method and an apparatus for transmitting D2D signals, wherein the method comprises: detecting a synchronization signal and/or a D2D signal, and determining a synchronization reference for sending or receiving other D2D signals based on the synchronization signal and/or the D2D signal; based on information carried in the detected synchronization signal and/or the D2D signal, determining a D2D resource configuration; and based on the determined synchronization reference for sending or receiving the other D2D signals and the determined D2D resource configuration, determining a resource position used for transmitting D2D signals, and sending or receiving the other D2D signals in the resource position. By enabling a UE to learn the D2D resource configuration based on the synchronization signal and/or the D2D signal, the present application prevents the UE from always using fixed resources when transmitting D2D signals, thus reducing mutual interference and improving transmission efficiency and quality.

Embodiments herein relate to a first station (STA1) and a method performed by a first station (STA1) for handling Request-to-Send/Clear-to-Send, RTS/CTS, transmissions in a wireless communications network (100). The first station (STA1) is served by a first access point (AP1) in a first Basic Service Set (BSS1). The first station (STA1) receives a RTS/CTS transmission relating to a second Basic Service Set (BSS2). Then, the first station (STA1) determine whether or not to set a Network Allocation Vector, NAV, according to the RTS/CTS transmission based on whether the RTS/CTS transmission was sent from a second station (STA2) or from a second access point (AP2) in the second Basic Service Set (BSS2). Embodiments herein also relate to a first access point (AP1) and a method performed by a first access point (AP1) for handling RTS/CTS transmissions in a wireless communications network (100).

Disclosed are a device and method for realizing data synchronization. The device may include a synchronization circuit for a plurality of radio frequency (RF) chips, configured to realize work clock synchronization among the plurality of RF chips; and/or, a synchronization circuit for a plurality of channels in a single chip, configured to realize data synchronization among the plurality of channels in the single chip.

According to one embodiment, a base station apparatus includes: a radio equipment control that generates a baseband signal including data; a microwave apparatus that modulates the baseband signal to a microwave to transmit by radio; a microwave apparatus that demodulates the received first microwave to the baseband signal, then extracts a clock from a cycle of the data included in the baseband signal, imports the baseband signal in synchronization with the clock, and plays back the data; and a radio equipment that modulates the data played back by the microwave apparatus to a high-frequency signal, and the microwave apparatus outputs dummy data instead of the played back data when a frequency fluctuation amount of the clock exceeds a predetermined range.

In performing wireless communication between terminals to perform time difference measurement and propagation time measurement, first and second terminals that transmit a signal at least once in attempting space-time synchronization are included. The first terminal measures a reception phase of a locally transmitted signal, and a reception phase of a signal transmitted by the second terminal, adds a positive or negative phase to the measured reception phase, and makes a report to the second terminal. The second terminal measures a reception phase of a locally transmitted signal, and a reception phase of a signal transmitted by the first terminal, and makes a report to the first terminal. The first and second terminals obtain a time difference or propagation time according to a reception phase measured by a local device and reported from a counterpart, and obtain additional information based on a phase reflected in the time difference or propagation time.

A method for bidirectional data transmission, preferably in narrowband systems, between a base station and a terminal device includes providing the terminal device and the base station with frequency reference units and transmitting data between the base station and the terminal device over different frequencies. A basic transmit frequency is defined for transmitting data from terminal device to base station, the terminal device defines a terminal device transmit frequency on the terminal device side for transmitting data from terminal device to base station, a frequency offset Δf.sub.offset exists between the basic transmit frequency and the terminal device transmit frequency, the terminal device opens a receive window for data from the base station, and the frequency offset Δf.sub.offset is taken into account for opening the window. Base station determines the terminal device transmit frequency and base station transmits data to terminal device based on the determined terminal device transmit frequency.

Disclosed herein are a gateway-signaling method for frequency/timing offsets and an apparatus for the same. An apparatus for transmitting a broadcast signal according to an embodiment of the present invention includes a frequency/timing decision unit for determining a center frequency to which a frequency offset is applied using a carrier offset, which is identified using a timing and a management packet transmitted through a Studio-to-Transmitter Link (STL); and an RF signal generation unit for generating an RF signal to be transmitted, which corresponds to the center frequency.