98 results about "Cell Mobility" patented technology

In wireless communication, a device may change, add, or handover between cells of network access for inter-cell mobility. This may include Layer 1 and / or Layer 2 (L1 / L2) signaling for a user equipment (UE) moving between cells in a network. There may be a configuration message that includes configurations for one or more Layer 1 (“L1”) or Layer 2 (“L2”) Triggered Mobility (“LTM”) candidate cells. A measurement report with L1 measurements for the LTM candidate cells is used for a cell switch command to indicate a target LTM candidate cell to trigger execution of a LTM cell switch to the target LTM candidate cell. The LTM cell switch is from a source cell to the target LTM candidate cell.

A method (1300) by a user equipment, UE (402, 502, 602, 800), in a connected state is provided for configuring Layer 1 / Layer 2, L1 / L2, based inter-cell mobility. The method includes transmitting (1302) a Measurement Report comprising one or more measurements associated with one or more cells. The UE receives (1304) a Radio Resource Control, RRC, Reconfiguration message comprising at least one configuration of a L1 / L2 based inter-cell mobility candidate cell. The UE transmits (1306) an RRC Reconfiguration Complete message.

Embodiments include methods for a user equipment (UE) configured to communicate with a radio access network (RAN) node comprising a central unit (CU) and a distributed unit (DU) via a serving cell. Such methods include receiving, from the CU via the DU, an RRCReconfiguration message that includes channel state information (CSI) resource configurations associated with at least one candidate cell for L1 / L2-based inter-cell mobility. The at least one candidate cell is provided by one or more neighbor DUs. Such methods include performing CSI measurements on the at least one candidate cell according to the respective CSI resource configurations and sending, to the DU via the serving cell, one or more CSI reports based on the CSI measurements performed. Other embodiments include complementary methods for a CU, a first DU, and a second DU, as well as UEs, CUs, and DUs configured to perform such methods.

Embodiments include methods for a user equipment (UE) configured to communicate with a radio access network (RAN) node via a serving cell. Such methods include obtaining a configuration that defines one or more conditions that trigger lower layer measurements on one or more candidate cells for L1 / L2 inter-cell mobility. Such methods include performing one or more of the following measurements: lower layer measurements of the serving cell, first L3 measurements of the serving cell, and second L3 measurements of at least one of the candidate cells. Such methods include, based on detecting that the performed measurements fulfil at least one of the conditions, initiating lower layer measurements of at least one candidate cell associated with the fulfilled at least one condition, and sending to the RAN node a lower layer measurement report that includes results of the lower layer measurements performed on the at least one candidate cell.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive first control signaling indicating a configuration of a set of serving cells for inter-cell mobility procedures and a layer one (L1) report configuration. The UE may transmit, in accordance with the L1 report configuration, an L1 report including channel information associated with one or more cell groups of the set of serving cells, where the one or more cell groups include both active and inactive serving cells for the inter-cell mobility procedures. In some cases, the UE may receive second control signaling modifying the L1 report configuration. The second control signaling may indicate parameters of the L1 report configuration to be updated, such as cells or cell groups to be reported, quantities to measure and / or include in the L1 report, etc. The UE may update the L1 report configuration based on the second control signaling.

Presented are systems, methods, apparatuses, or computer-readable media for uplink timing alignment for inter-cell mobility. A wireless communication node of a candidate cell for a wireless communication device can send a configuration associated with the candidate cell, to the wireless communication device. The wireless communication node can receive a transmission sent by the wireless communication device according to the configuration.

Embodiments include methods for a user equipment (UE) configured to communicate with a radio access network (RAN) node comprising a central unit (CU) and a distributed unit (DU) that provides a serving cell for the UE. Such methods include receiving from the DU a lower layer signalling message indicating that the UE should perform L1 / L2-based inter-cell mobility to a first candidate cell provided by a candidate DU. The lower layer signaling message includes an indicator or identity of the first candidate cell, and an indication of a first TCI state to be used by the UE for communicating with the first candidate cell. Such methods include performing) an L1 / L2 mobility procedure towards the first candidate cell and communicating in the first candidate cell based on the first TCI state. Other embodiments include complementary methods for serving and candidate DUs, as well as UEs and DUs configured to perform such methods.

A method performed by a user equipment for Uplink access on a L1 / L2 triggered inter-cell mobility, LTM, candidate cell. The method includes receiving, from a network node, an LTM configuration for at least one LTM candidate cell, receiving a trigger from the network node, and receiving a first synchronization signal from the LTM candidate cell. The method further includes, in response to receiving the trigger, transmitting a UL signal to the LTM candidate cell during a UL resource occasion, where the UL resource occasion occurs during a period of time that is between receiving the trigger and receiving the first synchronization signal from the LTM candidate cell. The first synchronization signal is received after the trigger is received. Related network node methods, UEs and network nodes are also disclosed.

Methods, apparatuses, systems, devices, and computer program products for L1 / L2 inter-cell mobility and / or measurements are provided. One method may include performing measurements of a signal quality of a serving cell and, based on a first condition based on the signal quality of the serving cell being met, performing measurements of the signal quality of Layer 1 / Layer 2 triggered mobility (LTM) candidate cells, performing an evaluation of the measurements of the LTM candidate cells using a first measurement evaluation method, and / or reporting using a first reporting method. Based on a second condition based on a signal quality of the LTM candidate cells being met, performing measurements of signal quality of cells outside of the set of LTM candidate cells, evaluation of the measurements of the cells outside of the set of LTM candidate cells using a second measurement evaluation method, and / or reporting using a second reporting method.

A terminal according to one aspect of the present disclosure includes: a receiving section that receives a Medium Access Control Control Element (MAC CE) related to cell switching; and a control section that judges timing advance (TA) to apply to UL transmission, based on information included in the MAC CE. The MAC CE includes at least one of a field related to cell switching and a field related to the TA. According to one aspect of the present disclosure, even when inter-cell mobility is performed, communication can be appropriately controlled.

According to some embodiments, a method is performed by a wireless device for performing channel state information (CSI) measurements for layer one (L1) / layer two (L2) inter-cell mobility. The method comprises receiving a message from a network node. The message comprises at least one configuration of a target L1 / L2 inter-cell mobility candidate cell. The method further comprises: performing CSI measurements on at least one of a synchronization signal (SS) and a reference signal (RS) of the target L1 / L2 inter-cell mobility candidate cell based on the at least one configuration of the target L1 / L2 inter-cell mobility candidate cell and transmitting a CSI report including information based on the CSI measurements to the network node.

Aspects presented herein may improve the latency and efficiency of L1 / L2 inter-cell mobility by providing an improved TA management for a UE. In one aspect, a UE derives a TA for a set of deactivated cells based on an Rx time difference between an active cell and the set of deactivated cells. The UE maintains the TA for the set of deactivated cells prior to an activation of the set of deactivated cells. The UE applies the TA to the set of deactivated cells or to an initial Tx to the set of deactivated cells in response to the activation of the set of deactivated cells. The set of deactivated cells may correspond to one deactivated cell or a deactivated TAG that includes multiple deactivated cells.

Embodiments include methods for a user equipment (UE) configured to communicate with a radio access network (RAN) node comprising a central unit (CU) and a distributed unit (DU). Such methods include receiving, from the CU via the DU, a reconfiguration message that includes configurations associated with each of at least one candidate cell for L1 / L2-based inter-cell mobility from a serving cell provided by the DU. The candidate cells are provided by one or more neighbor DUs. Such methods include storing the received configurations and receiving, from the DU, a lower layer signalling message including a command for the UE to change its serving cell to a first candidate cell, for which a configuration was received in the reconfiguration message. Such methods include performing an L1 / L2 mobility procedure towards the first candidate cell and communicating in the first candidate cell according to the stored configuration associated with the first candidate cell.

Methods are described for a wireless device, such as a UE, to execute a Layer-1 (LI) or Layer-2 (L2) based inter-cell mobility serving cell change, based on the fulfillment of an execution condition (e.g., based on measurements), using a conditional reconfiguration. The UE receives, from a serving network node, a message containing at least one conditional reconfiguration for L1 / L2 based inter-cell mobility serving cell change. The at least one conditional reconfiguration includes at least one of an execution condition, an indication of a candidate target cell for L1 / L2 mobility, and a lower layer command. When an execution condition associated to the candidate target cell for L1 / L2 inter-cell mobility is fulfilled, the UE executes the conditional reconfiguration that results in a L1 / L2 based inter-cell mobility serving cell change to the candidate target cell. The UE then starts to operate according to a configuration of the candidate target cell in the L1 / L2 based inter-cell mobility serving cell change.

Embodiments includes methods for a user equipment (UE) configured for conditional layer- 1 / layer-2 triggered inter-cell mobility (LTM) in a radio access network (RAN). Such methods include receiving the following information from a first RAN node via a source cell: a 5 configuration for an LTM candidate cell provided by a second RAN node, an execution condition for LTM cell switch by a UE to the LTM candidate cell, and a configuration of resources for an initial transmission in the LTM candidate cell after the execution condition is fulfilled. Such methods include, in response to determining that the execution condition is fulfilled, performing an LTM cell switch from the source cell to the LTM candidate cell, including selectively 0 performing a random access (RA) to the LTM candidate cell based on whether the configured resources are activated. Other embodiments include complementary methods for the first and second RAN nodes. 5 Figure 7 is selected for publication.

In general, the current subject matter relates to secure layer 1 / layer 2 (L1 / L2) centric inter-cell mobility execution. In some implementations, secure L1 / L2 centric inter-cell mobility execution can include mapping a physical cell identifier (PCI) of at least one L1 / L2 triggered mobility (LTM) target cell of at least one target distributed unit (DU) of a base station that is a candidate for handover (HO) for a user equipment (UE) to an index, and securely transmitting the mapping from a centralized unit control plane (CU-CP) of the base station to the UE and to a serving DU of the base station that is currently serving the UE for at least one service.

Embodiments include methods for a user equipment (UE) configured for layer-1 / layer-2 triggered inter-cell mobility (LTM) in a radio access network (RAN). Such methods include receiving, from a RAN node, a single command for early synchronization with an LTM candidate cell. The single command includes an identifier of the LTM candidate cell and an identifier associated with a transmission configuration indicator (TCI) state of the LTM candidate cell. Such methods include, based on the single command, performing early uplink (UL) synchronization and early downlink (DL) synchronization with the LTM candidate cell. Other embodiments include complementary methods for a RAN node, as well as UEs and RAN nodes configured to perform such methods.

A method for wireless communication at a user equipment (UE) is provided. In the method, the UE receives, via radio resource control (RRC), a configuration of multiple candidate cells for layer 1 (L1) or layer 2 (L2) inter-cell mobility from a network entity, and receive information about an L2 reset when switching between the multiple candidate cells from the network entity. Then, the UE performs a serving cell switch within the candidate cells for the UE in response to L1 or L2 signaling, and resets or reuses an L2 cell configuration based on the information in response to the serving cell switch.

A method for performing an inter-cell mobility (LTM) cell change based on L1 / L2 by a UE includes receiving an LTM configuration, the LTM configuration including an LTM candidate cell configuration for LTM; receiving an indication of an LTM candidate cell; and performing DL pre-synchronization with the LTM candidate cell. The UE receives an LTM cell change command from a serving cell, wherein the command indicates that the UE needs to access and change to an LTM candidate cell; and transmitting an uplink (UL) signal to the LTM candidate cell in response to the LTM cell change command. Related network node methods are also disclosed.

A method of managing condition switching in a mobile network is provided. The method includes receiving, at a user equipment (UE) served by a first node, conditional switching configuration data for one or more nodes, the one or more nodes including a second node. The method further includes starting a timer in response to an event during a handover from the first node to the second node. The method further includes preventing initiation of a handover to the first node from the second node to the first node when the timer is running.

A terminal according to one embodiment of the present disclosure is provided with: a receiving unit that receives a downlink control channel (PDCCH) command for a certain candidate cell; and a control unit that determines, on the basis of the PDCCH command, execution of a power ramp for random access channel (PRACH) transmission, the control unit sets a preamble power ramp counter to 1 in addition to a case where a serving cell is instructed as a candidate cell for inter-L1 / L2 cell mobility (LTM) by the PDCCH command.

A wireless terminal of a cellular telecommunication system communicates with an access node via a cell and comprises receiver circuitry and processor circuitry. The receiver circuitry is configured to receive, from the cell, serving cell mobility information. The processor circuitry configured to determine, based on the serving cell mobility information, mobility state of the cell.

The present application provides a wireless communication method and a user equipment, which can reduce the delay and interruption of inter-cell mobility. In one embodiment, the wireless communication method provided by the present application can include: a user equipment in a serving cell of a mobile communication network receiving a configuration, the configuration including an active set of cells; the user equipment performing pre-synchronization and measurement with each active cell in the active set of cells based on the configuration, wherein the user equipment maintains downlink (DL) synchronization with each active cell; the user equipment receiving a cell handover command from the mobile communication network to hand over from the serving cell to a target cell belonging to the active set of cells; and after receiving the handover command, the user equipment applying RRC configuration of the target cell.

An apparatus for wireless communication at a UE is provided. The apparatus is configured to receive a layer 1 (L1) or layer 2 (L2) mobility cell configuration for a set of cells for L1 or L2 inter-cell mobility. The set of cells include multiple cells, and each cell in the set of cells is able to be activated or deactivated for data and / or control transfer using L1 or L2 signaling. The apparatus is further configured to receive L1 or L2 signaling indicating multiple activated cells, and activate one or more cells in the multiple activated cells in the priority order for the data and / or control transfer using L1 or L2 signaling. The apparatus provides configuration, cell activation or deactivation in an optimized order, and associated signaling to enable L1 / L2 mobility for more efficient and robust mobility management.

Some embodiments include an apparatus, method, and computer program product for using low layer protocols for inter-cell mobility management in a 5G wireless communications system. A serving 5G node B (gNB) can configure reports that a user equipment (UE) transmits to the serving gNB to make handover decisions. The serving gNB can configure a group of Transmission Configuration Indication (TCI) states (e. g., a group of beams) that correspond a physical cell, and the report includes layer 3 measurements corresponding to a neighboring or serving cell's TCI state. The report can be conveyed using lower layer protocols. The report can include layer 1 measurements conveyed using a layer 1 protocol and the serving gNB can perform filtering to generate corresponding layer 3 measurement results. Based on the reports, the serving gNB can perform a handover and synchronization using lower layer protocols, from one TCI state to another.

A terminal according to one aspect of the present disclosure includes a receiving section that receives a synchronization signal block of a non-serving cell, and a control section that determines a transmission configuration indication (TCI) state of a demodulation reference signal for a physical downlink shared channel or a physical downlink control channel of a serving cell, based on the synchronization signal block of the non-serving cell. According to one aspect of the present disclosure, communication overhead can be suppressed in inter-cell mobility.

Aspects of the disclosure provide a method for wireless communications by a user equipment (UE). The method generally includes receiving signaling of a plurality of candidate target physical cell identifiers (PCIs) of at least one candidate target cell that supports physical (PHY) layer or medium access control (MAC) layer mobility signaling, participating in a handover procedure to a target cell associated with a selected one or more of the candidate target PCIs based on the PHY layer or MAC layer mobility signaling, receiving a response message from the target cell indicating success of the handover procedure, and terminating activity with one or more source PCIs after receiving the response message.

This disclosure provides systems, devices, apparatus, and methods, including computer programs encoded on storage media, for beam indication techniques for ICM. A UE (102) receives (310), from a first network entity (304), an indication of a beam associated with a second network entity (305). The indication of the beam corresponds to at least one of a TCI state associated with non-dedicated signaling from the second network entity (305) or an activation delay time for the beam based on whether the beam corresponds to dedicated signaling from the second network entity (305) to the UE (102) or the non-dedicated signaling from the second network entity (305). The UE (102) attempts to receive a downlink communication from the second network entity (305) based on the indication.

A method performed by a user equipment (UE) for selecting a conditional L1 / L2 triggered inter-cell mobility (CLTM) candidate cell. The method includes receiving (1502), from a network node, a CLTM configuration for multiple CLTM candidate cells, where the CLTM configuration includes at least one or more CLTM candidate cell configurations and at least one or more CLTM execution conditions. The method further includes determining (1504) whether at least one CLTM execution condition is fulfilled for the CLTM candidate cell. In response to there being more than one triggered CLTM candidate cell, the method includes selecting (1506) one of the triggered CLTM candidate cells for CLTM execution, wherein the selected cells are selected based on one or more selection criteria. Related network node methods, UEs, and network nodes, are also disclosed.

According to some embodiments, a method is performed by a wireless device for timing advance (TA) management between the wireless device and at least one target candidate cell for layer one (L1) / layer two (L2) inter-cell mobility. The wireless device is operating in a serving cell different from the target candidate cell. The method comprises: receiving an uplink configuration for a target candidate cell; transmitting an uplink message to the target candidate cell based on the uplink configuration; and receiving a TA value associated with the target candidate cell. The TA value is received in a message from the serving cell.