8161results about "Synchronisation arrangement" patented technology

A wireless device receives, from a base station, a radio resource control (RRC) reconfiguration message comprising a layer 1 / layer 2 triggered mobility (LTM) configuration. The LTM configuration comprises an LTM candidate configuration of a candidate cell and a value of a time alignment timer for determining whether a timing advance (TA) value of the candidate cell is valid. The wireless device receives, from the base station, a downlink control information (DCI) indicating the candidate cell and to transmit a random access preamble for acquiring the TA value of the candidate cell. Based on the DCI, the wireless device transmits, via the candidate cell, the random access preamble for acquiring the TA value of the candidate cell. The wireless device receives, from the base station, a medium access control (MAC) control element (CE) indicating an identifier of the LTM candidate configuration of the candidate cell and the TA value.

The invention discloses a low-altitude unmanned aerial vehicle trajectory tracking and monitoring method based on a 5G-A communication sensing integrated base station, and relates to the technical field of low-altitude traffic management and communication sensing fusion, and the method comprises the steps: firstly collecting multi-source data such as a communication sensing fusion signal, environment interference and unmanned aerial vehicle attributes, and carrying out the alignment and packaging of a unified timestamp and a coordinate system into a synchronous data frame; then, deep fusion and anti-interference processing are carried out on the data frames, noise is filtered out, and pure fusion data is generated; and furthermore, real-time track calculation and motion trend prediction are carried out on pure data by utilizing multi-base-station cooperative calculation and prediction. Based on this, through a multi-target feature recognition and clustering separation mechanism, independent individual trajectories are accurately stripped from a complex mixed data stream, and compliance verification and anomaly judgment are performed on the trajectories in combination with an airspace rule base. In this way, the problems of signal interference and multi-target aliasing in a complex environment can be effectively solved, and therefore high-precision global tracking of the low-altitude unmanned aerial vehicle and real-time monitoring of abnormal behaviors are achieved.

A method can include transmitting, by a wireless device to a base station, via a first cell of the wireless device, an uplink signal based on determining a radio link failure of a second cell, the second cell being configured for early timing advance (TA) acquisition. The transmitting the uplink signal can be at least one of: based on the second cell being configured for early timing advance acquisition of the wireless device; or after receiving, by the wireless device, an indication to at least one of acquire a TA value of the second cell; start to acquire the TA value of the second cell; or transmit, by the wireless device via the second cell, a reference signal.

The invention discloses a time synchronization method suitable for a satellite communication system, and the method comprises the steps: analyzing a forward broadcast signal, and obtaining the reference time of a network clock; constructing a geometric prediction handle based on satellite orbit data, and predicting one-way propagation time delay between a terminal and a satellite by using the geometric prediction handle; estimating the processing delay of the terminal according to the symbol rate and the equipment working condition of the terminal and the delay calibration data; fusing the network clock reference time with the processing delay estimate to synthesize a terminal local time; and the sending time of the return link is calculated based on the local time and the propagation delay prediction. According to the method, the synchronization precision can be improved to a microsecond level, the convergence speed in a dynamic scene is accelerated, adaptive compression of the guard interval is supported, and the stability and spectrum efficiency of a satellite communication system are effectively improved.

The present disclosure relates to a wireless communication system and particularly to a method and an apparatus therefor, the method comprising the steps of: transmitting an RA preamble on one RO among a plurality of ROs, wherein, on ROs in a first RO group among a plurality of RO groups, a plurality of RA preambles having the same index are transmitted; receiving, on the basis of having transmitted the plurality of RA preambles, RAR by monitoring a plurality of PDCCH search spaces linked to the first RO group; and transmitting an uplink signal corresponding to the RAR, wherein a time resource of each PDCCH search space linked to the first RO group is linked to each RO of the first RO group.

Techniques are described herein for handling multi-modal synchronization. An example method can include processing first information relating to multi-modal synchronization between a first quality of service (QoS) flow and a second QoS flow. The method can further include processing second information indicating whether a packet data unit (PDU) discard is allowed based on a failure of the multi-modal synchronization. The method can further include generating, based on the first information and the second information, third information to configure a PDU discard behavior. The method can further include outputting the third information for transmission to a user equipment (UE).

A wireless transmit / receive unit (WTRU) may receive a radio resource control (RRC) message comprising configuration information. The configuration information may include one or more preconfigured candidate cell configurations. Each of the preconfigured candidate cell configurations may include a special cell (SpCell) configuration, a secondary cell (SCell) configurations, and / or a candidate cell index. The WTRU may receive a medium access control (MAC) control element (CE). The MAC CE may indicate to apply a first preconfigured candidate cell configuration of the one or more preconfigured candidate cell configurations and an activation state for each SCell in the first preconfigured candidate cell configuration. The WTRU may initiate a handover to a SpCell in the first preconfigured candidate cell configuration based on the indication in the MAC CE. The WTRU may transmit data to the SCells activated by the MAC CE.

Devices in a wireless communication system perform methods related to a GNSS position fix procedure. A user equipment connected to a network entity via a non-terrestrial network receives a measurement gap configuration and an indication of a remaining-validity-duration-update triggering condition. The UE conducts a GNSS position fix procedure for estimating a UE position during a measurement gap according to the measurement gap configuration. When the GNSS position fix procedure is successfully completed, the UE transmits a remaining GNSS validity duration. When the remaining-validity-duration-update triggering condition is met, the UE transmits an updated remaining GNSS validity duration.

A method may include a wireless device receiving resource control (RRC) messages comprising configuration parameters of a layer 1 / layer 2 triggered mobility (LTM) and a configured grant Type 1 for one or more physical uplink shared channel (PUSCH) transmissions of a random access channel (RACH)-less LTM cell switch. The method may also include receiving a medium access control (MAC) control element (CE) triggering an LTM cell switch procedure for the RACH-less LTM cell switch. The method may also include determining not to initiate a random access (RA) procedure based on the RACH-less LTM cell switch being ongoing. The method may also include, based on the RACH-less LTM cell switch being ongoing, not initiating the RA procedure. The method may also include transmitting, using the configured grant Type 1 and for the RACH-less LTM cell switch, a first PUSCH transmission of the one or more PUSCH transmissions.

The invention discloses a complex environment information acquisition method based on a sensor network, and relates to the technical field of sensor networks, and the method comprises the steps: building a complex environment portrait and a service level, and generating a scene configuration comprising an information freshness budget, a risk heat map and an alarm threshold; based on scene configuration, configuring mesh wireless networking, time synchronization parameters and candidate relays, and constructing observation configuration and quality rules; and generating a data stream and a real-time queue state according to a self-adaptive sampling strategy and an event mark, calculating an emergency degree and distributing a forwarding probability according to an information freshness budget by combining a candidate relay and a risk heat map, outputting uploaded data and a quality record, completing convergence and grading alarm according to an alarm threshold, and generating a disposal feedback and audit index. The state set, the uncertainty set, the link idle degree and the energy sufficiency are linked under the constraint of the information freshness budget, so that hot spot encryption, low-risk sparseness, reduction of energy consumption and conflict rate and standard observation time efficiency are realized.

The present disclosure relates to turning on / off a synchronization signal and a broadcast channel signal in a wireless communication system. This operating method of a terminal may comprise the steps of: receiving downlink control information (DCI) related to system information; acquiring allocation information for receiving the system information on the basis of the DCI; receiving the system information on the basis of the allocation information; acquiring first information related to the position of synchronization signal / physical broadcast channel blocks (SSBs) included in the system information; receiving second information related to on or off of the SSBs; and receiving at least one of the SSBs on the basis of the first information and the second information.

A first-type synchronization signal block (SSB) is transmitted on a cell at a first-type SSB time in a first mode. A second-type SSB is transmitted on the cell at a second-type SSB time on the basis of switching from the first mode to a second mode. The first type SSB includes a PSS, an SSS, and a PCBCH, and the second-type SSB has a different structure from the first-type SSB.

The invention discloses a seamless switching method and system for a high-speed terminal of a ground-non-ground convergence network based on trajectory prediction and resource pre-reservation, and belongs to the technical field of space-ground convergence communication. The core of the method is that a switching area is accurately judged through bidirectional motion prediction of a terminal and an NTN node; a dynamic switching window is calculated in a self-adaptive mode by combining factors such as terminal speed and network time delay; intelligently selecting an optimal target link by using an AI enabled link scoring model; and cooperative pre-reservation and uplink and downlink synchronization of resources are completed before the window. The method has the advantages that the problem of failure of traditional RSRP judgment in an NTN dynamic environment is solved, the switching success rate and prediction accuracy in a high-speed moving scene are remarkably improved, the service interruption time and signaling overhead are greatly reduced, the continuity and reliability of communication are effectively guaranteed, and the method is suitable for large-scale popularization and application. The method is suitable for high-dynamic service scenes such as intelligent network connection vehicles and unmanned aerial vehicles in a 6G network.

Disclosed, according to various embodiments, are a method by which a terminal performs cross link interference (CLI) measurement in a wireless communication system and an apparatus therefor. Disclosed are a method and an apparatus therefor, the method comprising the steps of: receiving information about a CLI measurement resource for CLI measurement; and transmitting, to a base station, measurement information including CLI measured on the basis of the CLI measurement resource, wherein, on the basis that timing advance (TA) information of a candidate cell is received, the measurement information further includes information about a cell ID determined on the basis of the TA information and a measurement timing when the CLI is measured.

A method according to an embodiment of the present disclosure comprises the steps of: receiving configuration information; transmitting a PRACH; and receiving an RAR on the basis of a window related to the RAR. The configuration information includes i) a first RACH configuration related to a PCI of a serving cell and ii) a second RACH configuration related to an additional PCI. The RAR is related to one of two TAGs. The PCI is related to a first TAG, and the additional PCI is related to a second TAG. On the basis that the PRACH is related to the additional PCI, a length of the window is determined on the basis of a response window parameter related to the second RACH configuration.

Aspects presented herein may improve network energy saving by enabling a base station to transmit SSBs in a set of SSBs with different periodicities. In one aspect, a base station configures each SSB in a set of SSBs with an SSB transmission periodicity for a time period, the time period including multiple SSB burst set transmission occasions, where at least a first SSB and a second SSB in the set of SSBs are configured with different SSB transmission periodicities. The base station transmits the set of SSBs based on a corresponding SSB transmission periodicity of each SSB over the time period.

Methods, devices, and systems for providing early timing advance (TA) acquisition are provided. A radio resource control (RRC) configuration of the early TA acquisition is received from a base station. A PDCCH order to trigger a random access channel (RACH) procedure toward a candidate cell is received from the base station. The RACH procedure for the early TA acquisition is initiated based on the received RRC configuration and PDCCH order. A preamble with a calculated transmission power on the candidate cell is transmitted to the base station.

The invention provides a compensation factor determination method and device, electronic equipment, a storage medium and a program product, and relates to the technical field of communication. According to the method, the traditional real-time index operation is replaced by a mode of pre-storing the time offset compensation factor value and searching the time offset compensation factor value by searching the address index, so that the hardware resource consumption is effectively reduced, the calculation delay is obviously reduced, and the high real-time requirement of the base station on the PUSCH channel estimation is met.

Apparatus and methods are provided to enhance communications for NTN. In some aspects, a base station (BS) comprises a processor configured to schedule an uplink transmission in response to an uplink transmission request from a user equipment (UE) using one or more subframes ranging from a first uplink subframe to a last uplink subframe. The processor is further configured to determine or receive a timing advance (TA) indicating amount of subframes transmitted during a time delay between the UE and the BS and schedule a downlink transmission aligned with the uplink transmission. The downlink transmission is blocked from subframes ranging from TA plus one or more subframes ahead of the first uplink subframe to TA minus one or more subframes ahead of the last uplink subframe. The processor is further configured to transmit and receive, via a non-terrestrial equipment, the uplink and the downlink.

Apparatuses and methods for transmission and reception between a reader and an Internet of Things (IoT) device. A method includes receiving a physical reader-to-device channel (PRDCH) from the reader. The PRDCH includes a medium access control (MAC) header and a payload. The MAC header indicates (i) a type of reader-to-device (R2D) message and (ii) information related to determining a size of the payload. The MAC header and the payload are jointly attached with a single set of cyclic redundancy check (CRC) bits. The method further includes determining, based on reception of the PRDCH, a transmission of a physical device-to-reader channel (PDRCH) to the reader including determining a type of device-to-reader (D2R) message, a size of a payload of the D2R message, a length of the PDRCH transmission, and a transmission timing of the PDRCH. The method further includes transmitting the PDRCH to the reader.

The invention discloses a wireless ranging method, device and equipment based on an HPLC and HRF dual-mode communication system, and belongs to the technical field of power line carrier communication. The method comprises the following steps: receiving wireless signals sent by a sending end in sequence, and performing frequency domain transformation on the wireless signals to obtain frequency domain response signals; performing interference suppression processing on the frequency domain response signal to obtain a target frequency domain response signal; calculating a synchronous timing deviation corresponding to the wireless signal based on the target frequency domain response signal; and calibrating the sampling clock frequencies of the transmitting end and the receiving end based on the synchronous timing deviations respectively corresponding to the successively received wireless signals, and performing ranging operation after calibration to obtain a ranging result. According to the invention, accurate and stable distance measurement can be realized in a dual-mode communication system based on HPLC and HRF.

The embodiment of the invention provides a downlink signal sending method and a downlink signal processing method, which are characterized in that a downlink signal is obtained on the satellite side based on a supplementary synchronization sequence, and then time-frequency synchronization is carried out on the terminal equipment side by using the downlink signal from the satellite. In the application, the terminal device can realize time-frequency offset tracking compensation without acquiring satellite ephemeris information and using GNSS (Global Navigation Satellite System) equipment, so that the influence of ephemeris errors and GNSS errors on time-frequency synchronization performance after the terminal device is shut down for a long time is eliminated, and the problem that the time-frequency synchronization performance of the terminal device is influenced in the related technology is solved. The problem of low precision of time-frequency offset tracking compensation in the satellite-ground communication process is solved, and the time-frequency synchronization success rate of satellite-ground communication under the conditions of inaccurate ephemeris and high speed is improved.

According to some embodiments, a method performed by a wireless device for non-terrestrial network (NTN) connection control comprises receiving a message comprising parameters from which the wireless device is informed that it is to disconnect from a terrestrial network (TN) and connect to one of one or more NTNs or disconnect from a NTN and connect to one of one or more TNs. Upon the parameters informing the wireless device to connect to one of one or more NTNs, the method further comprises: disconnecting from the TN; based at least in part on the one or more parameters, selecting one of the detected at least one of the one or more NTNs; and connecting to the selected NTN. Upon the parameters informing the wireless device to connect to one of one or more TNs: the method further comprises disconnecting from the NTN, and detecting, selecting, and connecting to the TN.

An operation method of a first device (100) in a wireless communication system is proposed. The method may comprise the steps of: on the basis of a first channel access priority class (CAPC) value related to a sidelink synchronization signal block (S-SSB), in order to transmit the S-SSB, performing channel sensing for a type 1 channel access procedure (CAP), wherein the first CAPC value is 1; and transmitting the S-SSB to a second device on the basis that a result of the channel sensing is idle.

The invention provides a random access response generation method, a program product, electronic equipment and a storage medium, and is applied to the technical field of communication, and the random access response generation method comprises the steps that after a random access preamble sent by a terminal is detected, a random access response is generated, the random access response carries a timing advance field, and the timing advance field is sent to the terminal; the value of the timing advance field is configured as follows: a first part in a preset value range represents a positive timing advance, and a second part in the preset value range represents a negative timing advance; and sending the random access response to the terminal. According to the scheme, the timing advance field value in the random access response is divided into the first part representing the positive timing advance and the second part representing the negative timing advance, so that the base station can transmit the timing adjustment information with relatively high accuracy to the terminal according to the actual arrival condition of the random access preamble, and the user experience is improved. Therefore, the accuracy of the detected leading TA is improved.

A wireless transmit / receive unit (WTRU) may be configured to receive configuration information indicating a plurality of sets of associations. Each set of associations may comprise a plurality of respective time instances and a plurality of respective timing advance (TA) offsets. The WTRU may transmit an indication of at least one of a mobile network node identification or WTRU location information. The WTRU may receive an indication of a first set of associations of the plurality of sets of associations. The WTRU may transmit a first sounding reference signal (SRS) for positioning (SRSp) transmission beginning at a first time. The first time may be determined based on at least a first TA offset of the first set of associations and a respective first time instance associated with the first TA offset.

Systems, methods, and instrumentalities may be configured for supporting relay node assisted positioning. A first wireless transmit / receive unit (WTRU) may receive, from a network node, configuration information indicating a Sounding Reference Signal for positioning (SRSp) configuration. The SRSp configuration may be associated with a second WTRU, a reference Timing Advance (TA) value associated with the first WTRU, a first threshold value, and a second threshold value. The first WTRU may receive, from the second WTRU, a first RSRP measurement. The first WTRU may determine a first TA value associated with the second WTRU, wherein the determination of the first TA value is based on the first RSRP measurement, the reference TA value, and a measurement associated with the network node. The first WTRU may transmit to the second WTRU, the SRSp configuration and the first TA value for the second WTRU.

An audio playback method includes: calculating an estimated playback delay difference of a current audio data, wherein the estimated playback delay difference is a difference value between a set playback delay and an estimated playback delay of the current audio data on a playback device; in response to the estimated playback delay difference being between a first lower limit value and a first upper limit value, adjusting a playback rate of audio on the playback device based on the estimated playback delay difference; in response to the estimated playback delay difference being greater than the first upper limit value or less than the first lower limit value, deleting audio data from or adding audio data to an audio buffer based on the estimated playback delay difference; and adding the current audio data to the audio buffer to play audio data that is in the audio buffer.

A technique for random access in conjunction with LTM operations is provided. The technique comprises performing an early random access procedure in a specific LTM candidate cell based on PDCCH order. Based on the early random access procedure, shorter cell switch delay is achieved. The specific LTM candidate cell is identified based on an implicit identifier determined from an explicit identifier indicated by the base station.

A method and an apparatus for paging in a wireless communication system are provided. The method includes determining, by a radio access network (RAN) node, information for paging, where the information for paging includes information for paging a User Equipment (UE) which is related to a synchronization signal block (SSB) beam; and paging, by the RAN node, the UE in an idle state or inactive state, based on the information for paging. The method can page a UE more accurately.