1686 results about "Timing advance" patented technology

A wireless device receives a configuration for a layer 1 or layer 2 triggered mobility (LTM) of the wireless device and / or an early timing advance (ETA) acquisition of the wireless device. The wireless device transmits, to a base station, a report indicating an elapsed time between a first event associated with the ETA and / or the LTM and a second event associated with the ETA and / or the LTM.

A wireless device receives, from a base station, a UE capability enquiry message and transmits a UE capability information message indicating a maximum number of candidate cells for ETA. The UE receives, from the base station, an RRC reconfiguration message comprising a LTM configuration comprising a first configuration for layer 1 measurement reporting, a second configuration of resource, for the layer 1 measurement reporting, and a configuration for a candidate cell. The UE transmits, to the base station and based on the first configuration and the second configuration, a layer 1 measurement report and receives, from the base station, a downlink control information indicating the candidate cell for ETA. The UE transmits via the candidate cell a random access preamble for ETA, receives a cell switch command, for LTM, indicating the configuration of the candidate cell and a TA value of the candidate cell, and applies the configuration of the candidate cell and transmits, based on the TA value and via the candidate cell, a physical uplink shared channel (PUSCH).

A wireless device receives, from a base station, an indication that a first candidate cell of a plurality of candidate cells for a layer 1 / layer 2 triggered mobility (LTM) and a second candidate cell of the plurality of candidate cells are associated with a same timing advance value. The wireless device acquires a timing advance for the first candidate cell. The wireless device executes an LTM cell switch procedure for the second candidate cell as a target cell for the LTM. The wireless device transmits, via the second candidate cell, an uplink signal using a timing advance value associated with the first candidate cell.

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.

A wireless device receives a layer 1 or layer 2 triggered mobility (LTM) cell switch command. The LTM cell switch command comprises a configuration index indicating a cell for an LTM procedure and does not comprise a timing adjustment value for a primary timing advance group (PTAG) of the cell. In response to receiving the LTM cell switch command with no timing adjustment value, the wireless device starts a time alignment timer associated with the PTAG after measuring a timing advance of the cell.

This disclosure relates to techniques for managing multiple timing advances in a wireless communication system. A wireless device may establish wireless links with a first transmission reception point and a second transmission reception point. The wireless device may receive a timing advance command. The wireless device may determine whether the timing advance command is associated with the first TRP or the second TRP.

The invention relates to the technical field of satellite communication, in particular to a time synchronization method, device and equipment for satellite communication, a medium and a program product. A terminal receives a synchronization signal block broadcasted by a satellite base station to perform preliminary synchronization, and decodes a main information block broadcasted by the satellite base station to obtain a cell-level public timing advance parameter and a time-frequency resource; selecting a lead code and a time-frequency resource in combination with a cell-level public timing advance parameter, initiating a random access request, and sending a first message to a satellite base station; receiving a second message from the satellite base station, wherein the second message comprises a timing advance instruction fed back according to the detection result of the lead code; and adjusting uplink timing synchronization according to the timing advance instruction, and sending a third message to the satellite base station through the physical uplink shared channel. According to the invention, on the premise that an existing preamble format and a timing advance indication range do not need to be changed, a terminal without GNSS capability can also realize initial random access and maintain uplink time synchronization.

Aspects of the present disclosure provide methods and apparatuses for protecting a reference signal (RS) and / or adjusting timing advance (TA) values to be used for timing synchronization between an apparatus (e.g. user equipment (UE))) and a device (e.g. transmit-and-receive point (TRP)) in a wireless network. The device operates in full-duplex (FD) mode and the apparatus operates in half-duplex (HD) or FD mode. In some embodiments, RSs transmitted in uplink and downlink directions are protected by puncturing one or more portions of time-frequency resources so that interference from other signals can be avoided or mitigated. The punctured portion of the time-frequency resources may be one or more symbols that together overlaps with a symbol at which the RS is to be received or sent. The device may send information indicating the portion to puncture using a higher-layer signaling, a dynamic signaling, or a preconfiguration by the network.

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 present disclosure is generally related to wireless communications technologies, network topologies, and communication device implementations, and in particular, to multipletransmission reception point (multi-TRP) uplink (UL) transmission schemes. The multi-TRP UL transmission schemes include timing advance (TA) associations for multi-TRP operation, channel state information (CSI) enhancements, and codebook structural enhancements. To enhance the performance of Rel-16 codebook, a new codebook structure is constructed by preserving the Rel-16 codebook structure in the spatial dimension (SD) and frequency dimension (FD) while extending the Rel-16 codebook in the time dimension (TD) using a mutually orthogonal Discrete Fourier Transform (DFT) basis.

The present disclosure describes techniques for timing advance management during layer (L1 / L2) Triggered Mobility (LTM). In one aspect, a method comprises obtaining timing advances (TAs) for one or more LTM candidate cells based on indication from a serving gNB-DU and storing the obtained TAs and receiving LTM serving cell switch command to switch from a current serving cell to a target cell. The method further comprises transmitting, a list of candidate cell IDs and the stored TAs corresponding to the list of candidate cell IDs, to the target gNB-DU serving the target cell, in response to the successful completion of the LTM cell switch.

The invention discloses a joint estimation method for timing advance and frequency offset based on a conjugate symmetric ZC sequence, which relates to the technical field of wireless communication and comprises the following steps of: inputting a leader sequence extracted from a demodulated received signal; two ZC sequences in the leader sequence are respectively in cross-correlation with a local ZC sequence, and a peak value of a cross-correlation result amplitude is obtained; iteratively performing fractional frequency offset compensation estimation to obtain a fractional frequency offset estimation value and a compensated leader sequence; performing timing advance estimation and integer frequency offset estimation to obtain a timing advance estimator and an integer frequency offset estimator; obtaining a frequency offset estimation value by combining the decimal multiple and integer multiple frequency offset estimation values; and ending the timing advance and frequency offset estimation, and outputting estimated values of the timing advance and the frequency offset. According to the method, the negative influence of the decimal frequency offset on the ZC sequence is eliminated in a mode of iteratively compensating and estimating the decimal frequency offset, and high-performance timing advance and frequency offset joint estimation with robustness to frequency shift and noise is realized based on the structure of the conjugate symmetric ZC sequence; the method is suitable for a non-ground network communication scene with large Doppler frequency shift and low receiving signal-to-noise ratio.

A method for a user equipment (UE) in a non-terrestrial network (NTN) is provided. The method receives, from a base station (BS), an indication associated with a UE-specific timing advance (TA) report. The indication includes a value. The method initiates a random access (RA) procedure. The method then determines whether to transmit the UE-specific TA report based on the value of the indication. If the method determines that the value enables transmission of the UE-specific TA report, the method transmits, to the BS, the UE-specific TA report through the RA procedure.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may communicating a first uplink message using a first uplink carrier and a first timing advance (TA) value associated with a first transmission configuration indicator (TCI) state and a second uplink message using a second uplink carrier and a second TA value associated with a second TCI state for the UE. The UE may receive a timing advance group (TAG) configuration which indicates a TA value to apply for a supplementary uplink (SUL) carrier of the serving cell, which is one of the first TA or second TA values. The UE may then transmit a SUL message using the SUL carrier of the serving cell in accordance with the TA value determined for the SUL carrier based on the TAG configuration for the UE.

Methods and apparatus for Timing Advance (TA) validation are disclosed. In some embodiments, a method for wireless communication at a user equipment (UE) comprises receiving, from a base station, configuration information, where the configuration information specifying a configured grant (CG)-small data transfer (SDT) resource available for use by the UE and specifying a configuration for a Reference Signal Received Power (RSRP) change-based TA validation method to be met in order to perform a SDT while in the RRC inactive state, the RSRP change-based TA validation method having configured TA validation criteria that is evaluated based on two measurement windows for timing advance (TA) validation, and at least one boundary of at least one of the two measurement windows for TA validation is based on a minimum of either a Frequency Range 2 (FR2) measurement period and a scaled Discontinuous Reception (DRX) cycle period, existing at time of TA validation criteria evaluation.

A method for reporting a timing advance (TA) value. The method includes: sending TA value information to a network device, in which the TA value information includes at least information of time when a TA value determined by a terminal is applied.

Embodiments include methods for a centralized unit (CU) of a radio access network (RAN) node. Such methods include sending, to a distributed unit (DU) of the RAN node, a request for one or more timing advance (TA) measurements for a user equipment (UE) with respect to one or more cells served by the DU. Such methods include receiving from the DU one or more responses that include the respective one or more TA measurements and for each received TA measurement, determining a corresponding downlink (DL) propagation delay (PD) between the DU and the UE. Other embodiments include complementary methods for a DU of a RAN node, as well as CUs and DUs configured to perform such methods.

Methods, systems, and devices for wireless communications are described. In some aspects, a user equipment (UE) may receive first control signaling from a first transmission and reception point (TRP) scheduling a first uplink transmission from the UE to the first TRP and may receive second control signaling from a second TRP scheduling a second uplink transmission from the UE to the second TRP. The first TRP and the second TRP may be associated with different timing advance groups (TAGs) and the UE and the multiple TRPs may employ a transmission rule-based procedure according to which the UE and the multiple TRPs are able to resolve any potential overlapping between uplink transmissions associated with the first TAG and uplink transmissions associated with the second TAG based on one or both of logical time and actual time.

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 user equipment (UE) may receive, from a first network entity, an indication of a configuration for the UE to report, to the first network entity, an estimate of a first timing advance value for a second network entity. The UE may determine the estimate of the first timing advance value. The UE may transmit, to the first network entity, the estimate of the first timing advance value for the second network entity or a reference signal time difference associated with the estimate of the first timing advance value. The UE may receive, from the first network entity, an indication of an error value associated with the estimate of the first timing advance value. The UE may determine a second timing advance value based on the estimate of the first timing advance value and the error value. The UE may transmit communications using the second timing advance value.

A zone timing advance value corresponding to a zone associated with a non-terrestrial network node may be determined. A terrestrial network node facilitating delivery of traffic with respect to a user equipment may determine to offload a portion of the traffic for delivery via the non-terrestrial network node. The terrestrial node may request the zone timing advance value, from a core network or from the non-terrestrial node, and may transmit a path switch request message comprising the zone timing advance value to the user equipment. The path switch request message may indicate traffic flows for which traffic is to be offloaded to the non-terrestrial node and may comprise indication of uplink resources corresponding to the non-terrestrial node to be usable by the user equipment to transmit the offloaded uplink traffic to the non-terrestrial node.

Some present implementations provide a method for a user equipment (UE) connected to a non-terrestrial network (NTN). The method may receive, from a base station (BS) of the NTN at a downlink (DL) slot n, a timing advance (TA) command. The method may also adjust a timing of uplink (UL) transmissions to the BS according to the received TA command. The method may also include applying the adjusted timing for the UL transmissions by performing the UL transmissions from a beginning of a UL slot n+k+1+Koffset. Koffset may be a common delay broadcast by the BS to a plurality of UEs connected to the NTN including the UE, and k may be an additional delay specific to the UE.

A method of wireless communication performed by a wireless communication device includes: communicating a plurality of timing advance group (TAG) indicators, wherein each TAG indicator is associated with at least one cell of a plurality of cells, wherein at least one of the plurality of cells is configured with two CORESET pool index values and two TAG indicators. The method further includes communicating, at a first time based on a first TAG indicator associated with a first reference cell of the plurality of cells, a first communication signal, wherein the first reference cell is based on a number of CORESET pool index values and TAG indicators associated with at least one of the plurality of cells.

Various solutions for physical random access channel (PRACH) timing advance operation and PRACH configurations with respect to user equipment and network apparatus are described. An apparatus may determine a propagation delay between the apparatus and a network node. The apparatus may determine a pre-compensation timing margin. The apparatus may perform a timing advance pre-compensation according to the propagation delay and the pre-compensation timing margin. The apparatus may transmit an uplink signal by applying the timing advance pre-compensation.

A user equipment (UE) is configured to receive, from a serving base station of a radio access network, an uplink (UL) timing advance configuration including a first time alignment timer (TAT) corresponding to a first transmission and reception point (TRP) and a second TAT corresponding to a second TRP in a multi-TRP network arrangement, detect an out of synchronization (OOS) condition for the first TRP based on the first TAT while the second TRP remains synchronized based on the second TAT, or receive a physical downlink control channel (PDCCH) order from the network mapped to the first TRP triggering a physical random access channel (PRACH) transmission, stop UL transmissions for at least the first TRP and transmit the PRACH so that the network can determine and configure a new TAT for the first TRP.

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.

Certain aspects of the present disclosure provide a method for wireless communication by a user equipment (UE) generally including receiving a physical downlink control channel (PDCCH) order to trigger a PRACH transmission associated with an additional PCI different from a first PCI associated with a serving cell, transmitting a PRACH associated with the additional PCI, receiving an indication, via a MAC-CE, of a timing advance (TA) associated with the additional PCI, and applying the TA for an uplink transmission associated with the additional PCI.

Embodiments of the present application are related to a method and apparatus of adjusting timing for multi-TRP transmission. An exemplary method of the present application includes: receiving information indicating a plurality of timing advance groups (TAG)s in a serving cell configured with a plurality of indexes, wherein each control resource set (CORESET) in the serving cell is associated with a corresponding index of the plurality of indexes: receiving a TA command associated with a TAG of the plurality of TAGs, wherein the TAG is associated with an index of the plurality of indexes; and transmitting an uplink transmission associated with the index in the serving cell according to the TA command.

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.

The embodiment of the invention provides a timing advance reporting method and a communication device. Timing advance reporting in a cell switching process can be realized. The method comprises the following steps: receiving a switching command from access network equipment; wherein the switching command is used for indicating the terminal equipment to be switched from the source cell to the target cell. And when the switching command carries the first indication information and / or the second indication information, triggering the reporting of the timing advance. Wherein the timing advance is the timing advance corresponding to the target cell, the first indication information is used for indicating an offset threshold of the timing advance reported by the terminal equipment, and the second indication information is used for indicating the terminal equipment to report the timing advance.