The present disclosure discloses an Internet of Things communication method. In the present disclosure, a downlink data frame sent by the network side device includes a legacy preamble, a HEW preamble, and a data field; a subcarrier resource that is corresponding to the data field in a frequency domain includes at least one resource unit RU; and the RU is used to send a downlink IoT frame to the IoT terminal, where the downlink IoT frame includes an IoT preamble and an IoT data field, the IoT preamble is used to transmit physical layer control information of the downlink IoT frame, and the IoT data field is used to transmit downlink data between the network side device and the IoT terminal. According to the present disclosure, a network side device in a WLAN can schedule an IoT terminal, thereby reducing a conflict risk in an IoT communication process.

In a case where signals branched from a single reference signal source are transmitted via a plurality of cables, a phase synchronization circuit can be used to stabilize a phase of a signal to be outputted from each cable. However, the phases of signal to be outputted from each cable is affected by combination of a length of each cable and an amount of delay caused by feedback control, so that phases of synchronization signals to be outputted from a plurality of transmission paths are not always the same as each other. In the present invention, since a frequency multiplier that multiplies a frequency of a signal outputted from each transmission path by an even number is provided for a phase synchronization circuit, the phases of the synchronization signals to be outputted from the transmission paths are aligned even when signals are branched from one reference signal.

In a case where signals branched from a single reference signal source are transmitted via a plurality of cables, a phase synchronization circuit can be used to stabilize a phase of a signal to be outputted from each cable. However, the phases of signal to be outputted from each cable is affected by combination of a length of each cable and an amount of delay caused by feedback control, so that phases of synchronization signals to be outputted from a plurality of transmission paths are not always the same as each other. In the present invention, since a frequency multiplier that multiplies a frequency of a signal outputted from each transmission path by an even number is provided for a phase synchronization circuit, the phases of the synchronization signals to be outputted from the transmission paths are aligned even when signals are branched from one reference signal.

Systems and methods for asynchronous communication are disclosed. For example, a method for asynchronous communication includes encoding, by a transmitter circuit and according to a first clock signal, a bit sequence by converting a one-bit in the bit sequence into a first sequence and a zero-bit in the bit sequence into a second sequence. A length of the first sequence and a length of the second sequence differ by at least three bits. The method also includes communicating, by the transmitter circuit, the first sequence and the second sequence to a receiver circuit that decodes the first sequence and the second sequence according to a second clock signal that is independent of the first clock signal.

Systems and methods for asynchronous communication are disclosed. For example, a method for asynchronous communication includes encoding, by a transmitter circuit and according to a first clock signal, a bit sequence by converting a one-bit in the bit sequence into a first sequence and a zero-bit in the bit sequence into a second sequence. A length of the first sequence and a length of the second sequence differ by at least three bits. The method also includes communicating, by the transmitter circuit, the first sequence and the second sequence to a receiver circuit that decodes the first sequence and the second sequence according to a second clock signal that is independent of the first clock signal.

Communication devices and systems with correct regeneration of an audio signal are disclosed. In one example, a communication device measures a number of predetermined reference clocks included in one cycle of a frequency divided signal, on the basis of an audio master clock having a frequency obtained by multiplying a frequency of a sampling clock to sample an audio signal, a frequency division ratio of a frequency divided signal of the audio master clock, and a predetermined reference clock. A packet generator generates a packet including information including the measured number, a bit width of serial data (SD) conforming to an Inter-IC Sound (I2S) standard, the frequency of the sampling clock, a frequency division ratio of the frequency divided signal to the audio master clock, a frequency ratio of the frequency of the audio master clock to the frequency of the sampling clock, and the SD.

Communication devices and systems with correct regeneration of an audio signal are disclosed. In one example, a communication device measures a number of predetermined reference clocks included in one cycle of a frequency divided signal, on the basis of an audio master clock having a frequency obtained by multiplying a frequency of a sampling clock to sample an audio signal, a frequency division ratio of a frequency divided signal of the audio master clock, and a predetermined reference clock. A packet generator generates a packet including information including the measured number, a bit width of serial data (SD) conforming to an Inter-IC Sound (I2S) standard, the frequency of the sampling clock, a frequency division ratio of the frequency divided signal to the audio master clock, a frequency ratio of the frequency of the audio master clock to the frequency of the sampling clock, and the SD.

Mixture of implicit and explicit signaling of the Synchronization Signal Block (SSB) time index for 5G New Radio. In NR, multiple SSBs (each containing PSS, SSS and PBCH) are sent on different beams, and on multiple time occurrences. The UE when detecting the SSB has therefore to identify the SSB time instance and the beam ID used by the gNB. This detection is allowed by said SSB time index. If sent on the PBCH, this prevents soft combining between PBCH time instances. It is therefore proposed to send the SSB time index via the DMRS interleaved with the PBCH. Problem: overhead would be too high for DMRS solution only. Solution: Part of the bits (the LSBs) of the SSB time index are signaled implicitly via the relative position of PSS, SSS and PBCH within a SSB. The other bits are explicitly sent using DMRS scrambling.

Various aspects described herein relate to techniques for synchronization channel design and signaling in wireless communications systems (e.g., a 5th Generation (5G) New Radio (NR) system). In an aspect, a method includes identifying a frequency band supported by a user equipment (UE), identifying one or more frequency locations based on the identified frequency band, and the one or more frequency locations are a subset of synchronization raster points used for synchronization signal transmission. The method further includes searching for at least one synchronization signal based on the one or more identified frequency locations.

Various aspects described herein relate to techniques for synchronization channel design and signaling in wireless communications systems (e.g., a 5th Generation (5G) New Radio (NR) system). In an aspect, a method includes identifying a frequency band supported by a user equipment (UE), identifying one or more frequency locations based on the identified frequency band, and the one or more frequency locations are a subset of synchronization raster points used for synchronization signal transmission. The method further includes searching for at least one synchronization signal based on the one or more identified frequency locations.