1275 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, 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.

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 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.

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.

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.

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.

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.

A method for transmitting information is performed by an access network device, and includes: sending first information to a user equipment (UE) in response to configuring a secondary cell for the UE, wherein the first information is configured to indicate at least one of a satellite ephemeris or one or more common timing advance (TA) parameters corresponding to the secondary cell, and the common TA parameters are configured for the UE to determine a common TA of the secondary cell.

Certain aspects of the present disclosure provide techniques for wireless communication by a user equipment (UE), generally including detecting that the UE is scheduled to transmit a first uplink (UL) transmission associated with a first timing advance group (TAG) that at least potentially overlaps with a second uplink transmission associated with a second TAG, selecting, based on one or more conditions, one of the first or second UL transmissions to transmit, and transmitting the selected UL transmission.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may measure a downlink reception timing difference between a reference active cell in a first timing advance group (TAG) and a reference deactivated cell in a second TAG, wherein the second TAG is a deactivated TAG. The UE may derive a timing advance for the second TAG based at least in part on a timing advance for the first TAG and the downlink reception timing difference between the reference active cell and the reference deactivated cell. The UE may transmit, on one or more cells in the second TAG, one or more uplink communications using the timing advance for the second TAG, in connection with activation of the one or more cells in the second TAG. Numerous other aspects are described.

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.

A method can include receiving one or more messages indicating multiple timing advance groups (TAGs) that include a first primary timing advance group (PTAG), for a special cell (SpCell), associated with a first uplink transmission configuration indication (TCI) state; a second PTAG, for the SpCell, associated with a second uplink TCI state; and a secondary TAG (STAG) for a secondary cell (SCell). The one or more messages can also indicate a first time alignment timer (TAT) for the first PTAG, a second TAT for the second PTAG, and a third TAT for the STAG. The method can also include transmitting, via a physical uplink shared channel (PUSCH) of the SpCell, an uplink transport block while the second TAT is running and the first TAT is expired.

A user equipment with a communication session existing with terrestrial radio network node may receive from the terrestrial node a link recovery configuration comprising a context identifier indicative of context information corresponding to the communication session. Based on poor radio link conditions or radio link failure, the user equipment may determine to transmit to a non-terrestrial node, identified in the link recovery configuration, a session transfer request that includes the context identifier. The session transfer request may be transmitted according to a timing advance or according to a non-terrestrial resource, associated with a non-terrestrial node identifier corresponding to the non-terrestrial node in the link recovery configuration. The session transfer request may request transfer of the existing communication session from the terrestrial node to the non-terrestrial node. Based on the context identifier, the non-terrestrial node may retrieve, from the terrestrial node, session context information usable to facilitate the existing communication session.

Methods, systems, and devices for wireless communications are described. A first device may identify first sidelink communication timing of a first UE and a second sidelink communication timing of a second UE. The first UE and the second UE may be in communication with the first device. The first device may determine a sidelink timing offset to be used by the first device in repeating a sidelink message between the first UE and the second UE. The first device may determine the sidelink timing offset based at on the first sidelink communication timing and the second sidelink communication timing. The first device may repeat the sidelink message between the first UE and the second UE in accordance with the sidelink timing offset.

The invention discloses a random access preamble and detection algorithm design based on low earth orbit satellite communication. Specifically, firstly, a novel lead code with a plurality of subsequences is provided, in order to enlarge the number of available lead codes in a wave beam, a ZCM sequence is introduced to form the subsequences, and orthogonal frequency division multiplexing is adopted for modulation and is sent to a channel. Subsequently, a timing advance (TA) detection algorithm is proposed. The first sub-sequence is used for decimal time delay detection, and the other sub-sequences are used for integer time delay detection. In addition, the peak detection ingeniously utilizes the variance of the power delay spectrum, so that the detection performance is improved. Finally, a simulation result shows that the lead code provided by the invention is almost not influenced by frequency offset, does not need pre-compensation, and is suitable for being applied to low-orbit satellite communication with relatively large frequency offset.

A method comprises receiving, by a wireless device, a first physical downlink control channel (PDCCH) order initiating a random access procedure associated with early timing advance acquisition procedure of a layer 1 and / or 2 triggered mobility (LTM) procedure. The method further comprises, based on the first PDCCH order, setting a preamble power ramping counter (PPRC) to an initial value, and transmitting a first preamble via the first candidate cell, with a first power. The method further comprises receiving a second PDCCH order, and transmitting, with a second power determined based on increasing the PPRC by one, a second preamble via the first candidate cell, based on: a first field of the second PDCCH order indicating the first candidate cell and a second field of the second PDCCH order indicating a retransmission.

Wireless communication devices, systems, and methods related to bundling of uplink communication signals under timing advance (TA) conditions are provided. For example, a method of wireless communication performed by a user equipment can include receiving, from a base station, a timing advance (TA), wherein the TA is scheduled to be implemented by the user equipment at a first time, the first time being after a start of a first uplink communication of a group of bundled uplink communications scheduled with phase coherence and before a start of a second uplink communication of the group of bundled uplink communications; determining whether to implement the TA at the first time or a second time, the second time being after transmission of the second uplink communication; and implementing the TA based on the determining.

Provided is a method for indicating timing advances. The method is applicable to a terminal device and the method includes: receiving first indication information, wherein the first indication information indicates information of a timing advance (TA) for a first cell, the first cell comprising at least one of a candidate cell for cell handover or a target cell for cell handover.

Embodiments of this application provide a timing advance determining method and a communication apparatus, to improve precision of calculating a timing advance (Timing Advance, TA) by a terminal, and reduce inter-symbol interference (Inter-Symbol Interference, ISI). The method includes: A first network device determines a first parameter based on a first delay compensation value, where the first delay compensation value is delay compensation made by the first network device for receiving a signal sent by a terminal, the first parameter indicates a difference between a round-trip delay of a feeder link in a non-terrestrial network NTN and the first delay compensation value, and the difference is used to determine a TA used by the terminal for signal sending; and the first network device sends the first parameter.