Disclosed herein are wireless devices operable at intermediate wireless at ranges of thousands of meters, utilizing packets that include a preamble and a data payload. Devices may be such things as keypads, door latches, occupancy monitors, sprinkler controllers and other devices needing a communications link. A digital spread-spectrum frequency hopping rotation is used, wherein packet transmissions rotate through frequency sequences. A spectrum-impact-smoothed channel set is fashioned using sequences that each specify a unique preamble frequency relative to the other sequences and channels. The set is traversed as packets are transmitted, thereby distributing the focused radio-frequency emission impact of packets having long preambles over time. Traversal of the set is by way of time slots relative to a point of synchronization in a first packet. Detailed information on various example embodiments of the inventions are provided in the Detailed Description below, and the inventions are defined by the appended claims.

The present invention relates to a terminal device adapted to perform Licensed Assisted Access, LAA, synchronization and cell discovery, and data reception and transmission on a licensed carrier and on an unlicensed carrier. The terminal device comprises a reception unit adapted to receive, on the licensed carrier, control information message. The control information message includes synchronization and discovery signal information indicating the position of a synchronization and discovery signal on the unlicensed carrier. The reception unit of the terminal device can receive, on the unlicensed carrier at the position indicated by the synchronization and discovery signal information, the synchronization and discovery signal. A timing unit adjusts the timing for transmission and reception of data according to the received synchronization and discovery signal.

A method performed by a wireless transmit/receive unit (WTRU) may include receiving a configuration message including timing information for monitoring at least a subset of a plurality of beams to receive a set of synchronization signals and receiving the set of synchronization signals based on the timing information. The received set of synchronization signals include a primary synchronization signal and a secondary synchronization signal. The method may include receiving a reference signal along with a physical broadcast channel (PBCH) transmission. The reference signal comprises a sequence that is derived from an index associated with one of the at least the subset of beams and associated with the received set of synchronization signals. The method may include transmitting a random access channel (RACH) transmission. The RACH transmission includes a preamble sequence corresponding to the one of the subset of the plurality of beams.

A transmitting apparatus for a wireless communication system, where the wireless communication system includes an OFDM based waveform corresponding to a plurality of pre-defined subcarrier spacing values including at least a first subcarrier spacing value f.sub.1 and at least a second subcarrier spacing value f.sub.2. The transmitting apparatus includes a processor and a transmitter where the processor is configured to generate a signal S.sub.1 that is a N.sub.SF time repetition of an another signal S.sub.2. A duration of the another signal S.sub.2 is 1/f.sub.2, N.sub.SF=f.sub.2/f.sub.1 is an integer greater than 1, and the transmitter is configured to transmit a symbol comprising S.sub.1.

The present invention relates to a method for electricity measurement by a vehicle-to-vehicle (V2V) device for V2V communications in a wireless communication system and to a device therefor. In particular, the present invention comprises the steps of: receiving at least one synchronization signal for V2V through a physical sidelink broadcast channel (PSBCH); and measuring received electricity from said at least one synchronization signal if the ID of said at least one synchronization signal is linked to a demodulation reference signal (DMRS) sequence having, applied thereto, an orthogonal cover code (OCC) having one fixed value, wherein the measurement is performed by means of averaging for each ID of said at least one synchronization signal.

Embodiments are directed to systems and methods for selecting appropriate transmission configurations in a mobile ad hoc frequency division duplexing mesh network. In one scenario, a node receives transmission parameters from a neighboring node, where the transmission parameters include an indication of the node's current transmission configuration. The node receives network parameters from neighboring nodes, where the network parameters include connection information describing the node's current network connection to the neighboring nodes. Then, based on the received transmission parameters and the received network parameters, the node calculates a change factor which indicates the desirability of changing transmission configuration. The node accesses the calculated change factor to determine whether the transmission configuration of the node is to be changed and, upon determining that the change factor indicates that the transmission configuration of the node should be changed, the transmission configuration of the node is changed to a second, different transmission configuration.

This application provides a communication method and a communications device. The method includes: determining configuration information of a plurality of synchronization signal blocks located at different frequency domain positions on one carrier, where the configuration information indicates configuration parameters of the plurality of synchronization signal blocks, the configuration parameter comprises configuration pattern indication information, and the configuration pattern indication information indicates synchronization signal blocks actually sent; and sending the configuration information to a terminal device.

A synchronization device has a signal reception unit and a signal generation unit. The latter provides a multicarrier signal, which serves as an internally transmitted signal. The former receives the same type of externally received signal as the internally transmitted signal. An STO timing detection unit detects a position at which a correlation value in the correlation calculation between sampled data of the internally transmitted signal shifted at a predetermined sampling interval and sampled data of the externally received signal is maximum as an STO timing. A difference calculation unit calculates a difference between phases of the externally received signal and the internally transmitted signal at each subcarrier in a state in which the STO timing is detected. A correction control unit executes correction control on the signal generation unit such that a difference in a phase of each calculated subcarrier is added as a correction amount.

A radio device applies a carrier frequency for transmission of data between the radio device and a base station of a cellular network. Further, the radio device configures a measurement time interval in which the radio device temporarily switches from the transmission of data to receiving at least one broadcast signal conveying system information from the base station. Based on the received at least one broadcast signal, the radio device estimates an offset of the carrier frequency as applied by the radio device to a frequency of a carrier signal as received from the base station.

Methods and apparatus for initial cell search and selection using beamforming are described. An apparatus is configured with multiple receive beams and includes an antenna and a processor. The processor is operatively coupled to the antenna and sweeps a respective one of the multiple receive beams during each of multiple synchronization sub-frames, using a pre-defined sweep time and dwell period, to detect a synchronization signal. The processor also obtains symbol timing information and a synchronization signal index from the detected synchronization signal. The obtained synchronization signal index corresponds to a synchronization signal index of the set. The process decodes a first broadcast channel using the obtained symbol timing information, the obtained synchronization signal index and a predefined or blind-coded symbol distance between the detected synchronization signal and the first broadcast channel. The process decodes a second broadcast channel using information obtained from decoding the first broadcast channel.