896 results about "Timing advance" 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.

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.

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.

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.

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.

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.

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.

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.

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.

A wireless device receives, from a base station, a radio resource control (RRC) reconfiguration message comprising a layer 1 and / or layer 2 triggered mobility (LTM) configuration of the wireless device. The LTM configuration comprises a configuration of a candidate cell for an LTM, a first identifier of the candidate cell, and a second identifier of the candidate cell for an early timing advance acquisition (ETA). The ETA comprises a user equipment (UE) based timing advance (TA) measurement. The wireless device measures a TA value of the candidate cell based on the RRC reconfiguration message comprising the second identifier. The wireless device receives an LTM cell switch command indicating the candidate cell. In response to receiving the LTM cell switch command, the wireless device transmits, via the candidate cell and based on the TA value, an uplink packet.

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 resource configuration method and apparatus, a terminal, a device, and a storage medium, are provided. The resource configuration method, performed by a first network node, includes: obtaining configuration information of an uplink resource of a target cell, where the uplink resource is shared by a plurality of terminals served by the first network node; and sending a first command, where the first command is used to allocate at least a part of the obtained uplink resource of the target cell for a target terminal in the plurality of terminals, and indicate the target terminal to obtain a Timing Advance (TA) value of the target cell based on the uplink resource or perform handover to the target cell based on the uplink resource, and the target cell belongs to a second network node.

Apparatus and methods are provided for timing advance management for the UE in the LTM to reduce latency. In one novel aspect, early UL synchronization for timing advance management is provided. In one embodiment, the UE receives PDCCH order from the connected serving cell indicating an early UL synchronization procedure towards a candidate cell and receives a timing advance (TA) of the candidate cell in the cell switch command. In one embodiment, the PDCCH order indicates whether the PRACH is to be an initial transmission or a retransmission to the candidate cell and the UE increments a power ramping counter when the PDCCH order indicates a retransmission. In one embodiment, the PDCCH order includes a cell indicator of the candidate cell with one or more reserve bits of DCI 1_0 of the PDCCH order. In one embodiment, the PDCCH order indicates whether a RAR is expected.

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.

A wireless device receives a radio resource control (RRC) message comprising configuration parameters indicating two control resource set (CORESET) pool indexes for a downlink bandwidth part (BWP) of a cell, two timing advance groups (TAGs) for the cell, and a list of joint transmission configuration indication (TCI) states for both uplink transmissions and downlink receptions via the cell, wherein each joint TCI state in the list of joint TCI states is associated with a respective TAG among the two TAGs. The wireless device receives a second message indicating a timing advance (TA) value. The wireless device receives a control command indicating a joint TCI state from the list of joint TCI states. The wireless device transmits, using the joint TCI state, an uplink signal based on the TA value in response to the joint TCI state being associated with the TAG.

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.

An uplink synchronization method is performed by a terminal device, and includes: sending an uplink reference signal to a network device of at least one candidate cell, wherein the uplink reference signal is configured by a network device of a serving cell where the terminal device is located, and is used to determine timing advance (TA) information by the network device of the at least one candidate cell; receiving TA indication information sent by the network device of the serving cell where the terminal device is located, wherein the TA indication information sent by the network device of the serving cell at least comprises: TA information of a target cell to be switched to by the terminal device among the at least one candidate cell; and performing uplink synchronization according to the TA information of the target call, based on the network device of the serving cell instructing the terminal device to switch to the target cell.

A second base station distributed unit receives, from a base station central unit, a user equipment context setup or modification request message indicating a request for a parameter, of an early timing advance, ETA, acquisition, indicating a radio resource of a cell, and sends, to the base station central unit, the parameter of the ETA indicating the radio resource.

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.

A method and apparatus are disclosed. In an example from the perspective of a User Equipment (UE), the UE receives one or more uplink grants scheduling a first uplink transmission and a second uplink transmission on a first serving cell. The first uplink transmission is associated with a first Timing Advance (TA). The second uplink transmission is associated with a second TA. The first uplink transmission at least partially overlaps with the second uplink transmission in time domain. Based on a comparison of a TA difference, between the first TA and the second TA, with a first threshold, the UE transmits at least one of the first uplink transmission or the second uplink transmission.

A method and apparatus for processing data, and a user equipment (UE) are provided. The method for processing data includes: in response to a determination that a change in a first reference signal received power (RSRP) is less than a first threshold, or in response to a determination that changes in a plurality of first RSRPs are all less than a second threshold, or in response to a determination that changes in a plurality of first RSRPs are less than respective thresholds thereof, determining that a timing advance or timing alignment is valid. The present disclosure can improve data transmission quality of small data transmission (SDT) and reduce a power consumption of the UE.

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.

Embodiments of the present disclosure relate to a contention-based message 3 (Msg3) transmission. In an aspect, a terminal device determines uplink (UL) timing advance (TA) estimation error associated with an estimated TA. The terminal device further, based on determining the UL TA estimation error, disables a contention-based Msg3 transmission or adjusts the estimated TA to obtain a TA. In this way, unnecessary contention-based Msg3 transmission can be avoided to reduce the uplink and downlink signaling.

Embodiments of the present application relate to methods and apparatuses for handling different timing advance (TA) in a multiple transmission reception points (TRPs) operation. According to an embodiment of the present application, a user equipment (UE) includes a transceiver and a processor coupled to the transceiver. The processor may be configured to: access a serving cell with a transmission reception point (TRP) associated with a timing advance (TA); receive a radio resource control (RRC) reconfiguration message related to another TRP associated with another TA via the transceiver from a network, wherein the abovementioned another TA is different from the TA; and perform a random access (RA) procedure to the abovementioned another TRP, after receiving the RRC reconfiguration message.

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.