510 results about "Timing advance" patented technology

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.

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.

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 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.

This application provides a communication method and a communication apparatus applied to the field of L1 / L2 triggered mobility. The method includes: A first network device receives a contention-free random access preamble of a first candidate cell; and the first network device sends an identifier of a target cell of a switch and timing advance (timing advance, TA) information of the target cell to a terminal device, where the target cell is a second candidate cell, and the TA information of the target cell is determined based on the contention-free random access preamble of the first candidate cell. The TA information of the candidate cell that the terminal device switches to and accesses may be determined based on the candidate cell for which the terminal device initiates the random access procedure.

A satellite communication method, applied to a first communication apparatus, includes determining a global navigation satellite system (GNSS) validity duration. The satellite communication method also determining an extension duration of the GNSS validity duration based on a validity duration of a timing advance command (TAC). The starting point of the extension duration is an ending point of the GNSS validity duration. An ending point of the extension duration is an ending point of the validity duration of the TAC. The validity duration of the TAC is received within the GNSS validity duration. The satellite communication method further includes performing a GNSS measurement or entering an idle state, in response to the GNSS validity duration ending and no information for triggering the GNSS measurement being received.

Embodiments include methods for a user equipment (UE) configured to operate in a cell served by a radio access network (RAN) node. Such methods include receiving at least the following information from the RAN node during a first procedure: downlink (DL) data associated with an application hosted by the UE, and a timing advance (TA) command applicable to UE uplink (UL) transmissions to the RAN node. Such methods include initiating a time alignment timer (TAT) in response to receiving the TA command. Such methods include, after completion of the first procedure and based on determining that the TAT has not expired, transmitting to the RAN node one or more messages according to a timing adjusted based on the TA command. Other embodiments include complementary methods for a RAN node, as well as UEs and RAN nodes configured to perform such methods.

The invention provides a method and a device used in a node for wireless communication. The method comprises the following steps: a first node determines propagation time delay according to a first parameter; and compensating the sending time of the first data in advance according to the propagation time delay. Wherein the first parameter comprises at least one of the following information: position information of the first node, ephemeris information of a service satellite, public timing advance, parameter effective time, reference signal sending time or an identifier of a track section where the satellite is located.

This application provides a communication method and a communication apparatus. The method includes: receiving first information, where the first information indicates a manner of obtaining a timing advance (TA) of a first cell; and obtaining the TA of the first cell based on the first information. According to the technical solution provided in this application, the obtaining manner of obtaining the TA of the first cell is configured for the terminal apparatus based on the first information. Therefore, before receiving a cell handover command, the terminal apparatus may obtain the TA of the first cell in the manner indicated by the first information, to complete uplink synchronization with the first cell. Therefore, after the terminal apparatus is handed over to the first cell, it may no longer perform the uplink synchronization process. Therefore, a handover delay of handover to the first cell can be reduced.

Various aspects of the present disclosure relate to methods, apparatuses, and systems that support TA for positioning. For instance, implementations provide a set of signalling and procedural enhancements to enable the support of timing advance (TA)-based and / or TA-assisted positioning procedures over non-terrestrial supported networks. Further, measurement reporting procedures are provided for TA-based and / or TA-assisted positioning, as well as application and configuration aspects of the procedures for both single and multiple satellite systems.

Methods and apparatuses for methods and apparatuses for facilitating signaling of multiple timing advance (TA) values to a user equipment (UE), facilitating the use of multiple TA values by a UE for communication with multiple transmission and reception points (TRPs), and facilitating updating of TA values in a wireless communications network. A UE comprises a transceiver and a processor operably coupled to the transceiver. The transceiver is configured to receive a first TA command that includes a first TA value and a first TA group (TAG) identifier (ID) associated with a first entity, and a second TA value and a second TAG ID associated with a second entity. The processor is configured to identify a TAG ID associated with an uplink (UL) transmission, and identify, based on the TAG ID, a TA value. The transceiver is further configured to transmit the UL transmission using the TA value.

This disclosure relates to the field of communication technologies, and discloses a timing advance adjustment method and an apparatus. The method includes: A terminal device receives a handover command from a first cell, where the handover command instructs to perform handover to a second cell, sends a sounding reference signal (SRS) to the second cell based on a first timing advance (TA), receives a TA adjustment command from the second cell, where the TA adjustment command includes an adjustment amount for the first TA, and the adjustment amount is determined by the second cell based on the received SRS, and sends an uplink signal to the second cell based on a second TA, where the second TA is determined based on the first TA and the adjustment amount.

The application relates to the technical field of ground network communication, and provides a timing advance reporting method and device, wherein a terminal device generates an information unit according to an estimated timing advance, and sends the information unit to a non-ground network device; the information unit comprises a first characteristic field and a second characteristic field; the first characteristic field comprises data of a first dimension; and the second characteristic field comprises data of a second dimension. According to the application, the data of different dimensions is determined according to the timing advance, the reporting accuracy of the timing advance is improved, and the optimization design requirement of the non-ground network device is met.

A method for small data transmission (SDT) in RRC_INACTIVE state and related devices are provided. The method includes receiving a first SDT Timing Advance Command Media Access Control (MAC) Control Element (CE) from the network; starting or restarting Timing Alignment Timer (TAT) upon the reception of a Timing Advance (TA) command carried by the first SDT Timing Advance Command MAC CE, for keeping uplink (UL) time alignment during SDT in RRC_INACTIVE state; and when UL data arriving in UE TX buffer, transmitting SDT to the network while the TAT is running. With this method, UL synchronization / timing maintenance in RRC_INACTIVE state is realized.

Embodiments of the present application relate to methods and apparatuses for lower layer-based mobility with timing advance (TA) acquisition failure and preamble transmission collision under a 3rd Generation Partnership Project (3GPP) 5G system or the like. According to an embodiment of the present application, a candidate distributed unit (DU) of a base station (BS) includes a transceiver and a processor coupled to the transceiver, and the processor is configured to cause the candidate DU to: receive a request of a cell switching procedure associated with a candidate cell from a centralized unit (CU) of the BS; and transmit a response including configuration information associated with the candidate cell to the CU based on the request.

Apparatuses, methods, and systems are disclosed for timing and frequency adjustments in non-terrestrial networks. One apparatus includes a processor that determines a first frequency from one of a first reference signal received from a mobile wireless communication network and a configuration message received from the mobile wireless communication network. The processor determines a second frequency from a second reference signal received from the mobile wireless communication network. The processor computes a second timing advance value based on a first timing advance value, the first determined frequency, and the second determined frequency, the first timing advance value received as part of a control message. The apparatus includes a transceiver that transmits, to the mobile wireless communication network, an uplink signal using the second timing advance value.

To managing synchronization, radio access network (RAN) node transmits, to a user equipment (UE), a first timing advance (TA) value for managing synchronization of first transmissions between the UE and a first transmission and reception point (TRP) of the RAN node (606); transmits, to the UE, a second TA value for managing synchronization of second transmissions between the UE and a second TRP of the RAN node (608); stops scheduling the first transmissions in response to determining that the synchronization of the first transmissions is invalid (612); and stops scheduling the second transmissions in response to determining that the synchronization of the second transmissions is invalid (614).

Provided in the present application are a method for acquiring a timing advance (TA), and a related apparatus, which are applied to a terminal, wherein the terminal communicates with a satellite over a first channel. The method includes: acquiring a Doppler shift of a first channel; acquiring, on the basis of a preconfigured correspondence between the Doppler shift and an elevation angle of a satellite, a first elevation angle corresponding to the Doppler shift of the first channel; calculating the distance between a terminal and the satellite by using the first elevation angle; and acquiring a TA on the basis of the distance, wherein the TA is used for compensating for a service link delay between the terminal and the satellite. Acquiring an elevation angle on the basis of a preconfigured correspondence between a Doppler shift and the elevation angle of a satellite does not need to use location information of a terminal. Therefore, even if the terminal cannot use a positioning method such as GNSS positioning, the TA for compensating for a service link delay between the terminal and the satellite can also be acquired, thereby acquiring the TA for communication with a network.

Described herein is a A User Equipment, UE, comprising: at least one processor, and at least one memory storing instructions that, when executed by the at least one processor, cause the UE at least to: receive, before or when entering a Radio Resource Control, RRC, inactive state, from a network node, configuration information associated with a plurality of candidate cells for the UE to perform a Random Access Channel less, RACH-less access, the configuration information being further associated with a state transition of the UE from the RRC inactive state to an RRC connected state, wherein the plurality of candidate cells comprises a last serving cell of the UE before the state transition and / or one or more neighboring cells of the last serving cell, wherein the configuration information comprises Timing Advance related, TA-related configurations for determining a Timing Advance, TA, value at least for a target cell from the plurality of candidate cells, wherein the target cell is the last serving cell or one of the neighboring cells, wherein the UE is further configured to, while in the RRC inactive state: determine to transition from the RRC inactive state to the RRC connected state in response to an indication relating to data associated with the target cell; determine, for the target cell, the TA value based on the TA-related configurations; and perform the RACH-less access to the target cell based on the determined TA value for the target cell.

A method and an apparatus v are provided. The method includes: configuring a frame structure and related parameters of a satellite based on a channel feature, a service feature, and a transmission / reception unit capability; determining a resource scheduling scheme based on configuration information of the frame structure and related parameters and historical resource scheduling information; and performing a timing error compensation on the resource scheduling scheme based on a timing advance obtained by time-frequency synchronization, and performing a data transmission / reception based on the resource scheduling scheme after the timing error compensation.

Systems and methods are disclosed herein for supporting coherent transmissions in a wireless network such as a Non-Terrestrial Network (NTN). In one embodiment, a method performed by a wireless communication device comprises starting an uplink transmission and performing one or more actions comprising creating a time gap within the uplink transmission and / or muting a portion of the uplink transmission to support a timing advance of the continued uplink transmission. The method further comprises performing time-frequency compensation during a time period created by performing the one or more actions and continuing the uplink transmission after performing the time-frequency compensation. In this manner, a low-complexity method for achieving a compensation for a time variant Doppler shift is provided. This offers a predictability that can be used in a wireless network such as, for example, an NTN for supporting coherent demodulation and optimized receiver implementations.

A communication method and a related apparatus are provided. The method includes: receiving a first timing advance TA adjustment amount from a network device; and determining a first TA value, and sending, based on the first TA value, a 1st uplink signal after global navigation satellite system GNSS measurement. When a first condition is met, the first TA value is determined based on a first GNSS measurement value obtained through the GNSS measurement, the first TA adjustment amount, and a first value. When a second condition is met, the first TA value is determined based on the first GNSS measurement value, the first TA adjustment amount, and a second value. The first value is different from the second value.

The present invention is related to a method for enhanced RACH-less handover, performed by an UE in wireless communication with a first base station and a second base station. The method (100) comprises the following steps: (101) receiving, by the UE, an uplink timing advance (UL TA) of the second base station, and (102) providing, by the first base station, response to the UE, including an updated timing advance, wherein the uplink timing advance is either determined by the first base station, the second base station, a combination of both first and second base stations, or determined and reported by UE to the first base station.

Various aspects of the present disclosure relate to methods, apparatuses, and systems that support TA for positioning. For instance, implementations provide a set of signalling and procedural enhancements to enable the support of timing advance (TA) based and / or TA-assisted positioning procedures over non-terrestrial supported networks. Further, application and configuration aspects for TA-based and / or TA-assisted positioning are provided for both single and multiple satellite systems.

An apparatus of a user equipment (UE) configured to perform an uplink (UL) transmission in an asymmetric multiple transmit receive point (TRP) deployment scenario. The user equipment may determine and maintain timing advances (TA) tor respective transmit receive points in a heterogeneous network The heterogeneous network may include macro node supporting downlink (DL) and UL communications and micro and pico nodes with DL communications disabled.

Various solutions for synchronization and feeder link delay drift in non-terrestrial network (NTN) communications are described. An apparatus (e.g., a UE) receives from a network information of a common timing advance (TA), a common TA drift rate, and a common TA drift rate variation at a reference time. The apparatus determines a TA delay based on the information. The apparatus then performs NTN communications with the network with the TA delay accounted for.

Provided are a communication method and a communication device, relating to the technical field of communications, the method being applied to a first communication device, the method comprising: the first communication device obtaining an estimated value of Doppler frequency offset between the first communication device and a second communication device; obtaining the distance between the first communication equipment and the second communication equipment according to the estimated value of the Doppler frequency offset; and calculating a timing advance according to the distance, wherein the timing advance is used for synchronization between the first communication equipment and the second communication equipment. According to the method, the distance between the satellite and the user equipment and the timing advance can be calculated under the condition that the user equipment cannot obtain the position information of the satellite and the position information of the user equipment.

A wireless device receives one or more radio resource control (RRC) messages comprising one or more configuration parameters. The one or more configuration parameters indicate two timing advance groups (TAGs) for a cell, a list of transmission configuration indicator (TCI) states used for both uplink transmissions and downlink receptions via the cell, and TAG indicators for the list of TCI states. A TAG indicator of the TAG indicators indicates a TAG, of the two TAGs, for a TCI state in the list of TCI states. The wireless device receives a control command indicating the TCI state among the list of TCI states, wherein the TCI state is associated with the TAG of the two TAGs. The wireless device transmits an uplink signal based on the TCI state and a timing advance value of the TAG associated with the TCI state.

This disclosure provides a method for a user equipment to determine a radio wave delay time value, the method comprising the steps of: requesting a radio wave delay time from a base station; transmitting a time measurement signal via time measurement resources allocated by the base station; receiving a response from the base station including an extended timing advance command (extended TA command); and applying time information and starting a timer based on the received response. This disclosure also provides a method for a user equipment to perform communication in an unlicensed frequency band, the method comprising determining whether to transmit data via a configured license (CG), comparing the priority between the CG and uplink resources, and changing the priority of the CG based on a listen-before-tell (LBT) failure.

There is provided a method. computer program and apparatus for causing an apparatus of a second access node to perform: causing a first timing advance value to be provided to a user equipment for enabling the user equipment to synchronize uplink transmissions to a timing of a target cell supported by the second access node: determining a validity time of the first timing advance value, wherein, the first timing advance value is considered invalid after the validity time: and signaling. to a first access node supporting a serving cell connected to the user equipment. said validity time.