To prevent occurrence of delay and/or increase in power consumption at the time of access to a network in future radio communication systems, one aspect of a user terminal according to the present disclosure includes: a receiving section that receives a synchronization signal block including a broadcast channel in a certain sync raster; and a control section that controls, based on certain bit information of a certain information element included in the synchronization signal block, a sync raster to be detected by variably interpreting bit information included in at least one of the certain information element and another information element.

An uplink transmission methods and apparatuses to reduce a probability that a collision between a user equipment (UE) and another UE occurs when the UE sends uplink data, thereby improving network performance are described. A plurality of different preamble signals are sent to a network device by a user equipment (UE). A feedback signal of the network device in response to the plurality of preamble signals is received by the UE. The feedback signal in response to each preamble signal carries a timing advance (TA) corresponding to the preamble signal. A valid TA is determined by the UE from the plurality of received TAs. A parameter used for uplink transmission is determined by the UE based on a feedback signal carrying the valid TA or a preamble signal corresponding to the valid TA. Uplink data are sent according to the parameter by the UE.

Methods, systems, and devices for wireless communications for determining a minimum time gap between an received downlink message and transmission of an uplink message in response to the received downlink message. In some cases, a user equipment (UE) may receive a downlink message to perform a random access procedure. The UE may determine a minimum time gap based on an uplink transmission preparation time. The UE may transmit a random access preamble based on the minimum time gap. In some examples, the UE may receive a timing advance (TA) command and may determine a minimum time gap between receipt of the TA command and transmission of a time-adjusted uplink message.

Aspects of the disclosure provide apparatuses and methods for wireless communications. One apparatus includes processing circuitry that selects one or more first available radio link monitoring reference signal (RLM-RS) samples from a plurality of received RLM-RS samples based on signal qualities of the one or more first available RLM-RS samples. The one or more first available RLM-RS samples are received within a first evaluation period. The processing circuitry determines whether a total number of the one or more first available RLM-RS samples is less than a target number. When the total number of the one or more first available RLM-RS samples is determined to be less than the target number, the processing circuitry determines a second evaluation period that is greater than the first evaluation period, and performs an RLM procedure in an unlicensed band within the second evaluation period.

Disclosed are techniques for handling of radio frequency (RF) front-end group delays for roundtrip time (RTT) estimation. In an aspect, a network node transmits first and second RTT measurement (RTTM) signals to a user equipment (UE) and receives first and second RTT response (RTTR) signals from the UE. The network node measures the transmission times of the RTTM signals and the reception times of the RTTR signals, and the UE measures the transmission times the RTTM signals and the transmission times of the RTTR signals. The group delays of the transmit/receive chains of the network node and the UE are determined for one set of transmit/receive chains based on the first RTTM signal and first RTTR signal. The group delays of the transmit/receive chain used for the second RTTM signal and the second RTTR signal are determined relative to the group delay of the one set of transmit/receive chains.

Disclosed are techniques for determining a beam-specific timing advance for Round-Trip Time (RTT) estimation. In an aspect, a first node receives a plurality of beams transmitted by a second node on a wireless channel, selects a first beam from the plurality of beams for transmitting a timing response, determines a timing statistic, a timing difference, and a timing advance for the first beam, wherein the timing difference comprises a difference between the timing statistic and an earliest time of arrival of the plurality of beams, and wherein the timing advance comprises a multiple of the timing difference, and transmits the timing response for the first beam to the second node on the wireless channel, wherein the first node transmits the timing response after a time delay from the timing statistic of the first beam, wherein the time delay comprises a difference between a predetermined time delay and the timing advance.

In accordance with example embodiments of the invention there is at least a method and apparatus to perform determining, by a network node, context information of a group of more than one user equipment, wherein the context information is based on at least service related information associated with the more than one user equipment; sending information comprising the context information towards at least one base station of a communication network; and based on the context information, negotiating with the at least one base station timing synchronization requirements for distribution to each user equipment of the group. Further, there is at least a method and an apparatus to perform receiving from a network node, by a network device of a communication network, information comprising context information associated with a group of more than one user equipment, wherein the context information is based on at least service related information associated with the more than one user equipment; based on the information, negotiating with the network node timing synchronization requirements for distribution to each user equipment of the group; and in response to the negotiating, selecting at least one network device of the communication network for the distribution by the at least one network device of the timing synchronization requirements to each user equipment of the group of more than one user equipment.

A configuration method, a communication device, and a computer readable storage medium are provided; where the above method includes: configuring, in a SMTC period, at least two SMTC measurement windows to obtain SMTC configuration information (S101); and sending the SMTC configuration information to a terminal (S102). The configuration method can improve efficiency and success rate of a measurement.

A control method of beacon receiving time performed in a station that includes a receiving stage, receiving a first beacon n times from an access point (AP), and n is a natural number greater than or equal to 1; a computing stage, computing a first waiting time of a difference between a station wake-up time for receiving the first beacon and a receiving time of the first beacon every time of the n times of receiving; a deriving stage, deriving a representative value out of the n first waiting times; and a setting stage, setting a sum of a first beacon interval and the representative value of the first waiting times as a first wake-up interval of the station.

Embodiments of this disclosure provide a time calibration method and device. The method includes: determining time amount information for calibrating reference time; and calibrating, based on the time amount information, the reference time transmitted by a network side.