Embodiments of the present disclosure relate to methods, devices, apparatuses and computer readable storage media for signal source identification and determination. According to embodiments of the present disclosure, in response to detecting a signal, a device identifies at least one unit sequence from the signal. A bandwidth of each unit sequence is a common divisor of overlapping system bandwidths among a plurality of devices. The at least one unit sequence uniquely identifies a further device transmitting the signal. The device determines, based on the at least one unit sequence, the further device from the plurality of devices. As such, a device suffering interference due to atmospheric ducting can find out an interference source and perform an action to avoid the interference.

A method and apparatus for generation of orthogonal training signals for transmission in an antenna array are described. In this embodiment, a set of P training signals is generated. The generation of the P training signals includes generating a first set of Zadoff-Chu sequences, where the first set of sequences is based on a first reference Zadoff-Chu sequence and first subsequent Zadoff-Chu sequences, where each one of the first subsequent Zadoff-Chu sequences is a cyclic shift of the first reference Zadoff-Chu sequence. A second set of sequences is generated based on a second reference sequence and second subsequent sequences that are cyclic shift of the second reference sequence. The P training signals are determined based on the first set of sequences and the second set of sequences. The training signals are then transmitted through a plurality of transmit paths of a base station towards a wireless network.

The present disclosure provides a time-and-frequency synchronization method, a network device, and a terminal. The time-and-frequency synchronization method for the terminal includes: subsequent to determining that the terminal in an idle state or a DRX state needs to be woken up to receive a downlink signal, receiving a physical signal for time-and-frequency synchronization from the network device; and performing time-and-frequency synchronization in accordance with the physical signal.

Systems and methods for transmitting uplink control information, for example ACK/NACK, while in RRC_inactive state, are provided. Uplink control information is transmitted while in RRC_INACTIVE state by transmitting a sequence from a set of possible sequences to convey the uplink control information, the transmitted sequence associated with a value of the uplink control information. The sequence is asynchronously transmitted. Signalling may be used to configure a transmission resource within which to transmit the sequence, wherein the transmission resource has a time duration that is longer than a time duration to transmit the sequence. This has the effect of introducing a gap following sequence transmission that can ensure the sequence transmission does not interfere with a data transmission.

When a plurality of the subcarrier spacing values are applied, a reference signal is generated by using a sequence having a sequence length corresponding to a first ratio of a first subcarrier spacing set for transmission data to the maximum settable subcarrier spacing. The sequence of the reference signal is mapped to a frequency resource at mapping intervals in accordance with a second ratio which is the reciprocal of the first ratio, and the transmission data and the reference signal are transmitted.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a receiving user equipment (UE) may receive, from a transmitting UE, a sidelink reference signal in a first symbol of a slot. The receiving UE may perform a joint channel estimation and an automatic gain control (AGC) based at least in part on the sidelink reference signal received in the first symbol of the slot. Numerous other aspects are described.

Methods and apparatuses for transmitting synchronization signal in non-anchor carrier are disclosed. A method comprises transmitting a carrier configuration on an anchor carrier; and transmitting a synchronization signal in a non-anchor carrier based on the carrier configuration.

A method for generating, at a mobile device, a first flow control sequence for demodulating a first wireless channel transmitted by a base station; transitioning, by the user equipment device (UE), to a first power consumption state; monitoring, by the UE while in the first power consumption state, the first wireless channel for a second flow control sequence; detecting, at the UE, that the first flow control sequence matches the second flow control sequence; transitioning, by the UE from the first power consumption state to a second power consumption state, upon detecting that the first flow control sequence matches the second flow control sequence; and receiving, at the UE, a data flow from the base station via a second wireless channel.

A method for UE capability signaling to support NR-U is proposed. A UE transfers UE capability information to a mobile communication network, and the UE capability information includes information regarding whether the UE supports system information acquisition on an unlicensed cell. The UE receives configuration from a serving cell of the mobile communication network, and the configuration includes information for system information acquisition of one or more unlicensed cells on a frequency. The UE acquires system information of the one or more unlicensed cells on the frequency and reports the acquired system information to the serving cell, or stores the acquired system information in the UE.

A wireless node, such as an access point or a user equipment, includes a transceiver configured to transmit during a first frame in a first time interval and a second frame in a second time interval. The first and second time intervals are separated by an interframe space (IFS). The wireless node also includes a processor configured to generate a sensing waveform. The transceiver transmits the sensing waveform during the IFS. In some cases, the processor is configured to switch the transceiver from a transmit mode during the first time interval to a receive mode during the IFS. The transceiver receives a sensing waveform from a wireless node during the IFS.