This disclosure relates to techniques for supporting narrowband device-to-device (D2D) wireless communication, including possible techniques for providing synchronization and master information block signals in an off grid radio system. A wireless device may provide D2D synchronization signals for a D2D communication group. The D2D synchronization signals may be provided using multiple frequency channels. The D2D synchronization signals may be provided on each respective frequency channel of the frequency channels during a respective portion of a D2D synchronization signal cycle in a sequential manner.

The disclosure provides for control plane measurements in a wireless device. The wireless device may measure, across multiple sub-frames received over an unlicensed spectrum, received cell-specific reference signals (CRS) from a cell to obtain CRS measurements. The wireless device may identify one or both of a first subset of the CRS measurements associated with a first subset of the sub-frames including opportunistic transmissions and a second subset of the CRS measurements associated with a second subset of the sub-frames including guaranteed transmissions. The wireless device may compute one or both of a first signal to interference plus noise ratio (SINR) value for the first subset of the CRS measurements and a second SINR value for the second subset of the CRS measurements. The wireless device may monitor a radio link condition of the wireless device based at least in part on the first SINR value or the second SINR value.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may use a measurement procedure for beam detection within an existing cell. The UE perform a search procedure for a first synchronization signal block (SSB) to detect a first beam of a base station. The UE may determine a first timing offset for the first SSB based on the search procedure. The UE may estimate a second timing offset for a second SSB from the base station based on the first timing offset. The UE may perform a measurement procedure for the second SSB to detect a second beam of the base station based on the second timing offset. The UE may prune fake beams based on synchronization signals used for the measurement procedure.

Various embodiments are generally directed to improved channel quality information feedback techniques. In one embodiment, for example, an evolved node B (eNB) may comprise a processor circuit, a communication component for execution by the processor circuit to receive a channel quality index for a physical downlink shared channel (PDSCH), the channel quality index associated with a defined reference resource, and a selection component for execution by the processor circuit to select a modulation and coding scheme (MCS) for transmission over the PDSCH of user equipment (UE) data in one or more resource blocks, the selection component to compensate for a difference between a cell-specific reference signal (CRS) overhead of the defined reference resource and a CRS overhead of the one or more resource blocks when selecting the MCS. Other embodiments are described and claimed.

A method of detecting a synchronization switching pulse using a power detector in a time division duplexing (TDD) system includes receiving an input signal, detecting a power level associated with the input signal using a digital power meter, and determining a configuration associated with the input signal. The method also includes determining that a pulse width associated with the input signal is greater than a threshold, determining an offset associated with a special subframe configuration, and generating an estimated sync pulse. The method further includes forming a regenerated sync pulse, determining an error between the estimated sync pulse and the regenerated sync pulse, determining that the error is less than a threshold, and providing a lock detect.

A method of generating a device-to-device (D2D) signal by a user equipment (UE) in a wireless communication system, the method includes mapping a sequence for an automatic gain control (AGC) preamble to a resource element; and generating the AGC preamble by performing an inverse fast Fourier transform (IFFT) on the sequence for the AGC preamble mapped to the resource element, further the sequence for the AGC preamble is repeated N times when mapped to the resource element, and also N is determined based on at least one of a system frequency bandwidth or a transmission frequency bandwidth.

Time synchronization is precisely carried out based on pieces of time information in at least two time synchronization schemes. A time synchronization apparatus (1) includes: an acquisition section (11) that acquires pieces of time information of at least two time synchronization schemes among a plurality of time synchronization schemes; an extraction section (12) that extracts reliability of each of the pieces of time information; and a time synchronization section (13) that carries out time synchronization by deciding synchronization time information based on the reliability of each of the pieces of time information.

A method and a device in a User Equipment and a base station used for wireless communication. The UE receives a target radio signal and transmits first information on a target channel in turn. A channel measurement for the target radio signal is used for triggering the transmission of the first information. The target channel is a first type of physical layer channel or a second type of physical layer channel. If the target channel is the first type of physical layer channel, the transmission of the first information on the target channel is counted into the number of transmission times of the first information. Otherwise, the number of transmission times of the first information is unrelated to the transmission of the first information on the target channel. The present disclosure improves the success rate of retransmission, supports flexible configuration, and saves the transmit power consumption of the UE.

A method and a device in a User Equipment and a base station used for wireless communication. The UE receives a target radio signal and transmits first information on a target channel in turn. A channel measurement for the target radio signal is used for triggering the transmission of the first information. The target channel is a first type of physical layer channel or a second type of physical layer channel. If the target channel is the first type of physical layer channel, the transmission of the first information on the target channel is counted into the number of transmission times of the first information. Otherwise, the number of transmission times of the first information is unrelated to the transmission of the first information on the target channel. The present disclosure improves the success rate of retransmission, supports flexible configuration, and saves the transmit power consumption of the UE.

Techniques are described for millimeter wave wireless communication. One method includes configuring a synchronization slot associated with a plurality of synchronization blocks, configuring a transmission of each synchronization block of the plurality of synchronization blocks based on the configured synchronization slot, assigning a synchronization region to a first frequency portion associated with a transmission beam of each synchronization block, assigning at least one of a data region or a control region to a second frequency portion associated with the transmission beam of each synchronization block, and transmitting a synchronization signal during the synchronization region and transmitting at least one of data signal during the data region or control information during the control region to a wireless node.