Method, apparatus and computer program

Abstract

An apparatus is provided. The apparatus comprises means (700) for receiving, on a source cell, a radio resource control configuration for at least one candidate cell, wherein the radio resource control configuration of the at least one candidate cell comprises first configuration information for performing at least one measurement for the at least one candidate cell and second configuration information for transitioning from the source cell to the at least one candidate cell; means (702) for decoding for the first configuration information and the second configuration information; means (704) for receiving, on the source cell, a command to transition the apparatus from the source cell to a target cell selected from the at least one candidate cell; and means (706) for transitioning from the source cell to the target cell based on the second configuration information.

Description

Technical Field

[0001] This application relates to an apparatus, method, and computer program. In particular, but not exclusively, this application relates to managing low-level triggered mobility in a communication system. Background Technology

[0002] A communication system can be viewed as a facility that enables a communication session between two or more entities (such as user terminals, base stations, and / or other nodes) by providing carrier waves between various entities involved in the communication path. For example, a communication system can be provided by means of a communication network and one or more compatible communication devices. For instance, a communication session may include data communications for carrying communications, such as voice, video, email, text messaging, multimedia, and / or content data. Non-limiting examples of the services provided include two-way or multi-way calling, data communication or multimedia services, and access to data network systems such as the Internet.

[0003] Communication systems and related equipment typically operate according to a given standard or specification that defines what the various entities associated with the system are allowed to do and how they should be implemented. Communication protocols and / or parameters used for connectivity are also usually defined. One example of a communication system is UTRAN (3G Radio). Other examples are the Long Term Evolution (LTE) of Universal Mobile Telecommunications System (UMTS) radio access technology and so-called 5G or New Radio (NR) networks. NR is being standardized by the 3rd Generation Partnership Project (3GPP). Summary of the Invention

[0004] According to one aspect, an apparatus is provided, comprising: means for receiving, on a source cell, a radio resource control configuration for at least one candidate cell, wherein the radio resource control configuration for the at least one candidate cell includes first configuration information for performing at least one measurement on the at least one candidate cell and second configuration information for switching from the source cell to the at least one candidate cell; means for decoding the first configuration information and the second configuration information; means for receiving, on the source cell, a command to switch the apparatus from the source cell to a target cell selected from the at least one candidate cell; and means for switching from the source cell to the target cell based on the second configuration information.

[0005] The apparatus may include: components for decoding first configuration information and second configuration information in response to receiving radio resource control configuration for at least one candidate cell; components for performing at least one measurement for at least one candidate cell based on the first configuration information; and components for transmitting a measurement report on the source cell including at least one result of the at least one measurement for at least one candidate cell.

[0006] The apparatus may include: components for decoding first configuration information in response to receiving radio resource control configuration for at least one candidate cell; components for performing at least one measurement for at least one candidate cell based on the first configuration information; components for transmitting a measurement report on a source cell including at least one result of at least one measurement for at least one candidate cell; and components for decoding second configuration information in response to transmitting the measurement report.

[0007] The apparatus may include: components for decoding first configuration information in response to receiving radio resource control configuration for at least one candidate cell; components for performing at least one measurement for at least one candidate cell based on the first configuration information; components for transmitting a measurement report on a source cell including at least one result of at least one measurement for at least one candidate cell; components for receiving on the source cell a message that triggers the apparatus to decode second configuration information; components for decoding the second configuration information; and components for receiving on the source cell a command to switch the apparatus from the source cell to the target cell.

[0008] The message may include a request to perform a timed advance acquisition of at least one candidate cell.

[0009] The request may be a physical downlink control channel command configured to cause the device to transmit a preamble on the physical random access channel of at least one candidate cell.

[0010] The device may include a component for performing a timing advance acquisition for at least one candidate cell.

[0011] The message may include a request to add at least one transmission configuration information status of at least one candidate cell to the list of active transmission configuration information statuses.

[0012] The apparatus may include a component for adding at least one transmission configuration information status of at least one candidate cell to an active transmission configuration information status list.

[0013] This request can be received in the media access control unit.

[0014] The command to switch the device from the source cell to the target cell can be received in the media access control unit.

[0015] The apparatus may include: components for performing at least one measurement on a source cell; and components for transmitting a measurement report on the source cell including at least one result of the at least one measurement on the source cell.

[0016] The source cell and at least one candidate cell can be served by the same base station; or the source cell and at least one candidate cell can be served by different base stations.

[0017] The apparatus may include: components for transmitting data on a physical uplink shared channel of a target cell in at least one cell; components for transmitting control on a physical uplink control channel of a target cell in at least one cell; or components for transmitting a preamble on a physical random access channel of a target cell in at least one cell.

[0018] The device can be a user equipment.

[0019] According to one aspect, an apparatus is provided, the apparatus comprising at least one processor and at least one memory, the at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus to at least: receive, on a source cell, a radio resource control configuration for at least one candidate cell, wherein the radio resource control configuration for the at least one candidate cell includes first configuration information for performing at least one measurement for the at least one candidate cell and second configuration information for switching from the source cell to the at least one candidate cell; decode the first configuration information and the second configuration information; receive, on the source cell, a command to switch the apparatus from the source cell to a target cell selected from the at least one candidate cell; and switch from the source cell to the target cell based on the second configuration information.

[0020] According to one aspect, a method is provided, the method comprising: receiving, on a source cell, a radio resource control configuration for at least one candidate cell, wherein the radio resource control configuration for the at least one candidate cell includes first configuration information for performing at least one measurement for the at least one candidate cell and second configuration information for switching from the source cell to the at least one candidate cell; decoding the first configuration information and the second configuration information; receiving, on the source cell, a command to switch a device from the source cell to a target cell selected from the at least one candidate cell; and switching from the source cell to the target cell based on the second configuration information.

[0021] This method can be performed by the device.

[0022] The method may include: decoding first configuration information and second configuration information in response to receiving radio resource control configuration for at least one candidate cell; performing at least one measurement for at least one candidate cell based on the first configuration information; and transmitting a measurement report on the source cell including at least one result of the at least one measurement for at least one candidate cell.

[0023] The method may include: decoding first configuration information in response to receiving radio resource control configuration for at least one candidate cell; performing at least one measurement for at least one candidate cell based on the first configuration information; transmitting a measurement report on the source cell including at least one result of the at least one measurement for at least one candidate cell; and decoding second configuration information in response to transmitting the measurement report.

[0024] The method may include: decoding first configuration information in response to receiving radio resource control configuration for at least one candidate cell; performing at least one measurement for at least one candidate cell based on the first configuration information; transmitting a measurement report on a source cell including at least one result of the at least one measurement for at least one candidate cell; receiving on the source cell a message that triggers the device to decode second configuration information; decoding the second configuration information; and receiving on the source cell a command to switch the device from the source cell to the target cell.

[0025] The message may include a request to perform a timed advance acquisition of at least one candidate cell.

[0026] The request may be a physical downlink control channel command configured to cause the device to transmit a preamble on the physical random access channel of at least one candidate cell.

[0027] The method may include: performing timed advance acquisition of at least one candidate cell.

[0028] The message may include a request to add at least one transmission configuration information status of at least one candidate cell to the list of active transmission configuration information statuses.

[0029] The method may include adding at least one transmission configuration information status of at least one candidate cell to the list of active transmission configuration information statuses.

[0030] This request can be received in the media access control unit.

[0031] The command to switch the device from the source cell to the target cell can be received in the media access control unit.

[0032] The method may include: performing at least one measurement on a source cell; and a component for transmitting a measurement report on the source cell, the measurement including at least one result of the at least one measurement of the source cell.

[0033] The source cell and at least one candidate cell can be served by the same base station; or the source cell and at least one candidate cell can be served by different base stations.

[0034] The method may include: transmitting data on a physical uplink shared channel of a target cell in at least one cell; a component for transmitting control on a physical uplink control channel of a target cell in at least one cell; or transmitting a preamble on a physical random access channel of a target cell in at least one cell.

[0035] The device can be a user equipment.

[0036] According to one aspect, a computer-readable medium including instructions, when executed by an apparatus, causes the apparatus to at least: receive a radio resource control configuration for at least one candidate cell on a source cell, wherein the radio resource control configuration for the at least one candidate cell includes first configuration information for performing at least one measurement for the at least one candidate cell and second configuration information for switching from the source cell to the at least one candidate cell; decode the first configuration information and the second configuration information; receive a command on the source cell to switch the apparatus from the source cell to a target cell selected from the at least one candidate cell; and switch from the source cell to the target cell based on the second configuration information.

[0037] According to one aspect, a non-transitory computer-readable medium is provided comprising program instructions that, when executed by an apparatus, cause the apparatus to at least: receive, on a source cell, a radio resource control configuration for at least one candidate cell, wherein the radio resource control configuration for the at least one candidate cell includes first configuration information for performing at least one measurement for the at least one candidate cell and second configuration information for switching from the source cell to the at least one candidate cell; decode the first configuration information and the second configuration information; receive, on the source cell, a command to switch the apparatus from the source cell to a target cell selected from the at least one candidate cell; and switch from the source cell to the target cell based on the second configuration information.

[0038] Various other aspects are also described in the following detailed description and the appended claims. List of abbreviations AF: Application Functions AI: Artificial Intelligence AMF: Access and Mobility Management Functions API: Application Programming Interface BS: Base Station CE: Control Unit CU: Centralized Unit DCI: Downlink Control Information DL: Downlink DU: Distributed Unit gNB: gNodeB GSM: Global System for Mobile Communications HSS: Home Subscriber Server IE: Information Element IoT: Internet of Things LMF: Location Management Function LPP: Location Protocol LTE: Long Term Evolution LTM: Low-level triggered mobility or L1 / L2 triggered mobility MAC: Media Access Control ML: Machine Learning MS: Mobile Station MTC: Machine Type Communication NEF: Network Exposure Function NF: Network Functions NR: New Radio NRF: Network Repository Functionality PDCCH: Physical Downlink Control Channel PRACH: Physical Random Access Channel PUCCH: Physical Uplink Control Channel PUSCH: Physical Uplink Shared Channel PDU: Packet Data Unit RA: Random Access RAM: Random Access Memory (R)AN: (Radio) Access Network ROM: Read-Only Memory RRC: Radio Resource Control SMF: Session Management Function SSB: Synchronization Signal Block TA: Scheduled in advance TR: Technical Report TS: Technical Specification TTI: Transmission Time Interval UE: User Equipment UMTS: Universal Mobile Telecommunications System 3GPP: Third Generation Partnership Project 5G: Fifth Generation 5GC: 5G Core Network 5GS: 5G system Attached Figure Description

[0039] Embodiments will now be described by way of example only with reference to the accompanying drawings, wherein:

[0040] Figure 1 A schematic diagram of a 5G system is shown;

[0041] Figure 2 A schematic diagram of the control device is shown;

[0042] Figure 3 A schematic diagram of the user equipment is shown;

[0043] Figure 4a and Figure 4b A signaling diagram is shown for a process used to manage LTM in a 5G system;

[0044] Figure 5a and Figure 5b A signaling diagram is shown for another process used to manage LTM in a 5G system;

[0045] Figure 6 A block diagram is shown of a method for managing LTM in a 5G system, executed by a user equipment.

[0046] Figure 7 A block diagram illustrating a method for managing LTM in a 5G system, executed by a user equipment; and

[0047] Figure 8 A schematic diagram is shown of a non-volatile storage medium for storing instructions, which allow the processor to execute these instructions when they are executed by the processor. Figure 6 and Figure 7 One or more steps in the method. Detailed Implementation

[0048] In the following explanation, certain embodiments will be described with reference to mobile communication devices capable of communicating via wireless cellular systems and mobile communication systems serving such mobile communication devices. Before explaining the exemplary embodiments in detail, refer to... Figure 1 , Figure 2 and Figure 3 A brief explanation of some general principles of wireless communication systems, their access systems, and mobile communication devices is provided to aid in understanding the underlying technology of the described examples.

[0049] Figure 1 A schematic diagram of a 5G system (5GS) is shown. 5GS may include user equipment (UE), (radio) access network ((R)AN), 5G core network (5GC), one or more application functions (AF), and one or more data networks (DN).

[0050] 5G(R)AN may include one or more gNodeB (gNB) distributed unit functions connected to one or more gNodeB (gNB) centralized unit functions.

[0051] 5GC may include Access and Mobility Management Functions (AMF), Session Management Functions (SMF), Authentication Server Functions (AUSF), User Data Management (UDM), User Plane Functions (UPF), Network Exposure Functions (NEF), Unified Data Repository (UDR), Application Functions (AF), and / or Location Management Functions (LMF).

[0052] Figure 2 The diagram illustrates the control methods such as Figure 1 An example of a control device 200 for the functions of (R)AN or 5GC is shown. The control device may include at least one random access memory (RAM) 211a, at least one read-only memory (ROM) 211b, at least one processor 212, 213, and an input / output interface 214. At least one processor 212, 213 may be coupled to RAM 211a and ROM 211b. At least one processor 212, 213 may be configured to execute appropriate software code 215. Software code 215 may, for example, allow the execution of one or more steps to perform one or more aspects of this aspect. Software code 215 may be stored in ROM 211b. Control device 200 may be interconnected with another control device 200 that controls another function of the 5G(R)AN or 5GC. In some embodiments, each function of (R)AN or 5GC includes control device 200. In alternative embodiments, two or more functions of (R)AN or 5GC may share a control device.

[0053] Figure 3 An example of UE 300 is illustrated, such as Figure 1 The UE 300 is shown. UE 300 can be provided by any device capable of transmitting and receiving radio signals. Non-limiting examples include user equipment, mobile station (MS) or mobile device (such as a mobile phone or so-called 'smartphone'), computer provided with a wireless interface card or other wireless interface facilities (e.g., a USB dongle), personal data assistant (PDA) or tablet computer provided with wireless communication capabilities, machine-type communication (MTC) device, cellular Internet of Things (CIoT) device, or any combination of these devices. UE 300 can provide, for example, data communication for carrying communication. Communication can be one or more of voice, email, text messages, multimedia, data, machine data, etc.

[0054] UE 300 can receive signals via air or radio interface 307 through appropriate means for receiving, and can transmit signals via appropriate means for transmitting radio signals. Figure 3In the diagram, the transceiver device is schematically represented by block 306. The transceiver device 306 can be provided, for example, by means of radio components and an associated antenna arrangement. The antenna arrangement can be located inside or outside the mobile device.

[0055] UE 300 may provide at least one processor 301, at least one memory ROM 302a, at least one RAM 302b, and other possible components 303 for software and hardware-assisted execution of tasks it is designed to perform, including controlling access to and communication with access systems and other communication devices. At least one processor 301 is coupled to RAM 302b and ROM 302a. At least one processor 301 may be configured to execute appropriate software code 308. The software code 308 may, for example, allow the execution of one or more aspects of this aspect. The software code 308 may be stored in ROM 302a.

[0056] The processor, memory, and other related control devices can be housed in a suitable circuit board and / or chipset. This feature is indicated by reference numeral 304. The device may optionally have a user interface, such as a keypad 305, a touch-sensitive screen or touchpad, or a combination thereof. Depending on the type of device, one or more of a display, speaker, and microphone may optionally be provided.

[0057] One or more aspects of this disclosure relate to low-level triggered mobility or L1 / L2 triggered mobility (LTM) in a communication system.

[0058] LTM can refer to the UE being switched from a source cell to a target cell triggered by lower-layer signaling, rather than by upper-layer signaling. Lower-layer signaling can refer to Layer 1 signaling (e.g., Downlink Control Information (DCI)) or Layer 2 signaling (e.g., Medium Access Control (MAC) Control Unit (CE)). Upper-layer signaling can refer to Layer 3 signaling (e.g., Radio Resource Control (RRC) signaling). The target cell can be selected from candidate cells based on at least one of Layer 1, Layer 2, or Layer 3 measurements of the candidate cells.

[0059] One or more aspects of this disclosure relate to managing LTM mobility in a communication system such that the delay between the UE receiving a command to switch the UE from a source cell to a target cell and the UE making a transmission on the target cell is minimized.

[0060] This objective can be achieved by configuring the UE to (fully) decode the RRC configuration of the candidate cell before receiving the command to switch the UE from the source cell to the target cell (rather than after receiving the Layer 1 or Layer 2 signaling that triggers the switch from the source cell to the target cell).

[0061] Decoding the RRC configuration of a candidate cell may include at least one of the following: creating a complete RRC configuration for the candidate cell from a reference RRC configuration and an incremental RRC configuration, performing ASN.1 verification (e.g., syntax checking), or retrieving / interpreting information about the candidate cell.

[0062] In this way, after receiving the command to switch the UE from the source cell to the target cell, it is not necessary to decode the RRC configuration of the target cell. Therefore, the delay between the UE receiving the command to switch the UE from the source cell to the target cell and the UE transmitting the command on the target cell is minimized.

[0063] It should be understood that the RRC configuration of at least one candidate cell may include first configuration information for performing at least one of Layer 1, Layer 2, or Layer 3 measurements for the candidate cell.

[0064] It should be understood that the RRC configuration of at least one candidate cell may include second configuration information for transitioning from the source cell to the candidate cell (if one of the at least one candidate cell is selected as the target cell).

[0065] It should be understood that the RRC configuration can consist of first configuration information and second configuration information. That is, the RRC configuration can include only first and second configuration information. Alternatively, the RRC configuration can include both first and second configuration information. In other words, the RRC configuration can include not only first and second configuration information but also additional configuration information. In implementation, the UE can be configured to decode the first configuration information in response to receiving the RRC configuration of a candidate cell in an RRC reconfiguration message on the source cell. The UE can be configured to decode the second configuration information in response to receiving a request to perform Time Acquisition (TA) for at least one target cell on the source cell. This request can be a Physical Downlink Control Channel (PDCCH) command configured to cause the UE to transmit a Random Access (RA) preamble on the Physical Random Access Channel (PRACH) of one of the candidate cells.

[0066] In implementation, the UE can be configured to decode first configuration information in response to receiving RRC configuration of at least one candidate cell in an RRC reconfiguration message on the source cell. The UE can also be configured to decode second configuration information in response to receiving a request on the source cell to add a Transmission Control Information (TCI) state to the active TCI state list in the MAC CE. This request can be sent via TCI state activation of the MAC CE.

[0067] In implementation, the UE can be configured to decode first configuration information in response to receiving the RRC configuration of a candidate cell in an RRC reconfiguration message on the source cell. The UE can be configured to decode second configuration information in response to sending a measurement report on the source cell that includes at least one of Layer 1 measurement, Layer 2 measurement, or Layer 3 measurement of the candidate cell.

[0068] In implementation, the UE can be configured to decode both the first configuration information and the second configuration information in response to receiving the RRC configuration of the candidate cell in the RRC reconfiguration message on the source cell.

[0069] The source cell can be served by a BS (e.g., a gNB). Candidate cells can be served by the same BS (i.e., intra-BS switching) or by another base station (i.e., inter-BS switching). The BS may or may not be aware of the implementation of the RRC configuration used by the UE to decode the candidate cell. The UE can send explicit or implicit information on the source cell to the BS indicating the implementation of the RRC configuration used by the UE to decode the candidate cell.

[0070] Figure 4a and Figure 4b The signaling diagram of the LTM process in 5GS is shown.

[0071] Initially, the UE can be served by a source cell provided by the gNB. The UE can be in an RRC connected state. The UE can perform at least one of the following: Layer 1, Layer 2, or Layer 3 measurements of the source cell and other detected cells (e.g., possible candidate cells). For example, Layer 1 measurements may include Synchronization Signal Block (SSB) measurements and / or Channel State Information (CSI) Reference Signal (RS) measurements. The UE can perform Layer 3 measurements of the source cell based on the Layer 1 measurements of the source cell.

[0072] The UE can send a report to the gNB on the source cell, including the results of at least one of the Layer 1, Layer 2, or Layer 3 measurements of the source cell.

[0073] In step 1, the UE may receive an RRC reconfiguration message from the gNB on the source cell, including the RRC configuration of the candidate cells. For example, the gNB may select one or more candidate cells based on at least one of a Layer 1 measurement, a Layer 2 measurement, or a Layer 3 measurement of the candidate cells performed by the UE based on a previous RRC reconfiguration message. The RRC reconfiguration message may include at least one of a first configuration information or a second configuration information.

[0074] In step 2, the UE can extract and decode the first configuration information of the candidate cell. At this time, the UE does not need to perform RRC ASN.1 verification on the second configuration. When the UE receives a trigger message or indication, the UE will extract and decode the second configuration information of the candidate cell. The UE can also choose not to decode the complete second configuration, but only partially parse it. For example, the UE can parse the second configuration to identify the configuration associated with the candidate cell. That is, in step 2, the UE can partially extract and decode the RRC configuration.

[0075] In step 3, the UE can send an RRC reconfiguration complete message on the source cell.

[0076] It is understandable that steps 2 and 3 can be reversed.

[0077] In step 4, the UE may receive synchronization signal blocks (SSBs) on one or more selected candidate cells.

[0078] In step 5, the UE can perform at least one of the Layer 1 measurement, Layer 2 measurement, or Layer 3 measurement of the candidate cell by using the first configuration information.

[0079] In step 6, the UE may send a measurement report on the source cell that includes the results of at least one of the Layer 1, Layer 2, or Layer 3 measurements of the candidate cells. The gNB may determine that the TCI states of some or all of the candidate cells should be added to the list of active TCI states stored at the UE.

[0080] In step 7, the UE may receive a MAC CE on the source cell, which includes a request to add the TCI states of some or all of the candidate cells to a list of active TCI states stored at the UE. This request may include the cell identifiers of some or all of the candidate cells. This request may be a TCI state-activated MAC CE.

[0081] In step 8, the UE can extract and decode second configuration information for some or all of the candidate cells whose TCI states have been added to the active TCI state list. The UE performs LTM RRC processing in advance (i.e., before the cell handover command). By doing so, when the UE performs a cell handover to the target cell, the UE does not need to perform the LTM_RRC_processing procedure, and the cell handover delay can be reduced.

[0082] Alternatively, in step 9, the UE may send a measurement report on the source cell, which includes the results of at least one of the Layer 1, Layer 2, or Layer 3 measurements of the candidate cell.

[0083] In step 10, the UE may receive a PDCCH command on the source cell. This PDCCH command causes the UE to perform a random access procedure to obtain the timing advance (TA) of one or more candidate cells. The PDCCH command may cause the UE to transmit a random access (RA) preamble on the PRACH of one or more candidate cells. The PDCCH command also causes the UE to pre-execute LTM RRC processing using second configuration information. The LTM RRC processing may occur directly after the PDCCH command is received, or it may occur after the UE successfully performs the PRACH preamble transmission.

[0084] In step 11, the UE can extract and decode the second configuration information of one or more candidate cells. One or more candidate cells can be determined based on the measurements in step 5.

[0085] In step 12, the UE may send the RA preamble on the PRACH of one or more candidate cells.

[0086] Steps 6 to 8 are executed for the candidate TCI state activation process, and steps 9 to 12 are executed for the early TA acquisition process. Steps 6 to 8 and steps 9 to 12 are independent of each other. When the UE receives a trigger at step 7 or step 9, the UE can perform LTM RRC processing by using the second configuration information. The trigger used to perform LTM RRC processing can be one or both of the TCI state activation MACCE or PDCCH instructions.

[0087] In step 13, the UE may receive a MAC CE on the source cell, which includes a command to switch the UE from the source cell to the target cell. The target cell may be selected by the gNB from among the candidate cells based on at least one of the Layer 1, Layer 2, or Layer 3 measurements of the candidate cells received in step 6 or step 9.

[0088] If the UE receives a cell handover command, the UE performs a cell handover from the source cell to the target cell. In order to perform a cell handover, the UE can calculate the cell handover delay.

[0089] Step 14 represents the UE cell handover delay D during the cell handover process. LTM LTM conversion delay D LTM This could be the delay from the end of the last TTI containing the MAC CE command for cell handover to the time the UE sends the first UL message on the target cell. To determine this delay, it is necessary to determine the time interval including TTI. cmd T LTM-RRC-processing T first-ssb T delta and / or T marginThe value of at least one of the following (e.g., component). However, the UE has already performed LTM RRC processing at step 8 or 11, so the UE no longer needs T during cell handover. LTM-RRC-processing This reduces cell handover delay during the cell handover process. The calculation will be explained in detail below. For example, the UE can calculate the delay D from the end of the Transmission Time Interval (TTI), including the MAC CE, to transmission on the target cell. LTM The MAC CE has a command to switch the UE from the source cell to the target cell.

[0090] It allows the UE to delay D LTM Transmit or receive data or control information on the target cell. In delay D LTM Within this cell, the UE may be prohibited from transmitting on the target cell. Delay D LTM This can be referred to as cell switching delay.

[0091] Transmissions on the target cell may include sending data or control information on the Physical Uplink Shared Channel (PUSCH) or Physical Uplink Control Channel (PUCCH) of the target cell, and reception on the target cell may include receiving data or control information on the Physical Downlink Shared Channel (PDSCH) or Physical Downlink Control Channel (PDCCH). Transmissions on the target cell may include sending an RA preamble on the PRACH of the target cell.

[0092] Delay D in step 14 LTM It can be represented as follows: .

[0093] Delay D LTM It may include component T cmd This component can be responsible for confirming the receipt of the command sent on the source cell to switch the UE from the source cell to the target cell. Component T cmd It can be equal to T HARQ +3ms, where T HARQ This is the time between receiving the command to switch the UE from the source cell to the target cell and sending an acknowledgment (e.g., as described in 3GPP TS 38.213). Component T cmd It can be represented as follows:

[0094] Delay D LTM It may include component T LTM-RRC-processingThis component can be responsible for decoding the second configuration information of the target cell after receiving the command to switch the UE from the source cell to the target cell. If the second configuration information of the target cell has already been decoded in step 8 or step 11 before receiving the command to switch the UE from the source cell to the target cell in step 13, then component T... LTM-RRC-processing It can be set to zero. If the second configuration information of the target cell has not been decoded in step 8 or step 11 before receiving the command to switch the UE from the source cell to the target cell in step 13, then component T LTM-RRC-processing It can be set to a non-zero value. A non-zero value can be a default value (e.g., up to 10ms).

[0095] Delay D LTM It may include component T, which is responsible for applying second configuration information to the target cell. LTM-processing .

[0096] Delay D LTM It may include component T first-SSB This component is responsible for time tracking and acquiring timing information for the target cell. In some cases, such as if the target cell's TCI state is in the list of active TCI states stored by the UE, component T... first-SSB It can be set to zero. In other cases, such as if the target cell's TCI state is not in the list of active TCI states stored by the UE, component T... first-SSB It can be set to a non-zero value. A non-zero value can be responsible for the time between receiving the command to switch the UE from the source cell to the target cell and receiving the first SSB on the target cell. A non-zero value can be a default value (e.g., up to 160ms). In some cases, T... first-SSB It can also refer to the first transmission of another reference signal (such as TRS (Transmission Reference Signal)).

[0097] Delay D LTM This can include those responsible for T first-SSB The component T of the UE processing time of the reference signal (e.g., SSB) measured in the middle. margin Component T margin It can be set to a non-zero value. A non-zero value can be the default value (e.g., up to 2ms).

[0098] Delay D LTM It may include a component T responsible for waiting for resources to be used for transmission on the target cell. LTM-IU If the UE performs a RACH procedure with the target cell, then component T... LTM-IU It can be responsible for waiting for the PRACH resource used to transmit the RA preamble on the target cell. Component T LTM-IUIt can be up to the sum of the SSB to PRACH resource-related time period (e.g., as described in Table 8.1-1 of 3GPP TS 38.213) and non-zero values. This non-zero value can be a default value (e.g., up to 160ms).

[0099] If the UE does not perform the RACH procedure with the target cell, then component T LTM-IU It can be responsible for waiting for PUSCH or PUCCH resources used to transmit data or control on the target cell. The UE can switch from the source cell to the target cell. The UE can switch at a delay of D. LTM The transmission is performed on the target cell.

[0100] It should be understood that aspects related to the decoding of the second configuration information of the candidate cell in step 8 or step 11 can be specified in the standard.

[0101] It is understandable that, with delay D LTM Relevant aspects can be specified in the standard. For example, 3GPP TS 38.133 may include the following clauses. 6.X.1.2 LTM Cell Switching Delay LTM cell switching delay D LTM It is from the end of the last TTI containing the MAC-CE command for cell handover to the UE in The delay in sending the first UL message on the target cell, where: , in T cmd equal to T HARQ +3ms, where T HARQ It is the definition of the cell handover command and confirmation as specified in TS 38.213. hour T LTM-RRC-processing This is the time used for UE decoding and validity checks of the target cell's RRC configuration. If the UE... The cell handover command for the target cell indicated in the cell handover command has been preceded by a complete LTM according to TS 38.331. If the candidate cell configuration performs early decoding and early validity checks, then T LTM-RRC-processing =0, otherwise T LTM-RRC-processing =

[10] ms. After the PDCCH command has been executed before the cell handover command, T LTM-RRC-processing =0 After the candidate cell TCI state activation has been executed before the cell handover command, T LTM-RRC-processing =0 T LTM-interrupt As described in Section 6.X.1.2.1. 6.X.1.2.1 Interruption Time The interruption time is the period between the end of the last TTI containing the MAC-CE command used for cell handover and the UE transmitting on the target cell. The time between sending the first UL message, excluding the T specified in Section 6.X.1.2 cmd and T LTM-RRC-processing 。

[0102] It should be understood that decoding the second configuration information of the candidate cell in step 8 or step 11 can be based on UE capabilities. UE capabilities may include the UE capability to decode the second configuration information of the candidate cell in step 8 or step 11, i.e., the UE capability to decode the first configuration information of the candidate cell "earlier" (e.g., before receiving the command to switch from the source cell to the target cell in step 13). UE capabilities may include the UE capability to decode the second configuration information of a single candidate cell. UE capabilities may include the UE capability to decode the second configuration information of multiple candidate cells. For example, the UE may be able to store multiple TCI states of multiple candidate cells in the active TCI state list. The UE may be able to store N TCI states of N candidate cells in the active TCI state list, where the N TCI states of the N candidate cells are the last N TCI states added by the UE to the active TCI state list. The gNB may or may not know the UE capabilities. For example, the UE may send information indicating its capabilities explicitly or implicitly to the gNB on the source cell.

[0103] It should be understood that one or more of steps 1 through 13 may be optional (e.g., redundant) and therefore may be omitted. It should be understood that although steps 1 through 13 are shown in a single signaling diagram, these steps 1 through 14 may not be part of a single implementation. As explained above, one or more of steps 1 through 13 may be redundant or optional. One or more of steps 1 through 13 may be omitted to form different implementations.

[0104] It is understood that, in the above context, the source cell and the candidate cell can be served by the same gNB (i.e., intra-BS handover) or by another gNB (i.e., inter-BS handover). For example, the source cell and at least one candidate cell may be controlled by the serving gNB, or the source cell may be controlled by the serving gNB, while at least one candidate cell may be controlled by one or more other gNBs.

[0105] Figure 5a and Figure 5b A signaling diagram is shown for another process used to manage LTM in 5GS.

[0106] Initially, the UE can be served by a source cell provided by the gNB. The UE can be in an RRC connected state. The UE can perform at least one of the following: Layer 1 measurement, Layer 2 measurement, or Layer 3 measurement of the source cell and other detected cells (e.g., possible candidate cells). The UE can perform a Layer 3 measurement of the source cell based on the Layer 1 measurement of the source cell and other detected cells (e.g., possible candidate cells).

[0107] The UE can send a report on the source cell that includes the results of at least one of the Layer 1, Layer 2, or Layer 3 measurements of the source cell.

[0108] In step 1, the UE may receive an RRC reconfiguration message on the source cell that includes the RRC configuration of the candidate cell. For example, the gNB may select a candidate cell based on a Layer 1 or Layer 3 measurement of the candidate cell performed by the UE based on a previous RRC reconfiguration message. The RRC reconfiguration message may include at least one of a first configuration information or a second configuration information.

[0109] In step 2, the UE can extract and decode the first configuration information of the candidate cell. The UE can also extract and decode the second configuration information of the candidate cell. That is, in step 2, the UE can (completely) extract and decode the RRC configuration of the candidate cell.

[0110] In step 3, the UE can send an RRC reconfiguration complete message on the source cell.

[0111] It is understandable that steps 2 and 3 can be reversed.

[0112] In step 4, the UE can perform at least one of the Layer 1 measurement, Layer 2 measurement, or Layer 3 measurement of the candidate cell by using the first configuration information.

[0113] In step 5, the UE can receive a synchronization signal block (SSB) on the candidate cell.

[0114] In step 6, the UE may perform at least one of the Layer 1 measurement, Layer 2 measurement, or Layer 3 measurement of the candidate cell (e.g., if it has not been completed in step 4).

[0115] In step 7, the UE may send a measurement report on the source cell, which includes the results of at least one of the Layer 1, Layer 2, or Layer 3 measurements of the candidate cell (e.g., if not completed in step 4).

[0116] In step 8, the UE can extract and decode the second configuration information of the candidate cell (e.g., if it has not been completed in step 2).

[0117] The gNB can determine that the TCI status of some or all of the candidate cells should be added to the list of active TCI statuses stored at the UE.

[0118] In step 9, the UE may receive a MAC CE on the source cell, which includes a request to add the TCI states of some or all of the candidate cells to a list of active TCI states stored at the UE. This request may include the cell identifiers of some or all of the candidate cells. This request may be a TCI state-activated MAC CE.

[0119] In step 10, the UE can extract and decode the second configuration information of some or all of the candidate cells (whose TCI states have been added to the active TCI state list) (e.g., if not completed in step 2 or step 8). The UE performs LTM RRC processing in advance (i.e., before the cell handover command). By doing so, when the UE performs a cell handover to the target cell, the UE does not need to perform the LTM_RRC_processing procedure, and the cell handover delay can be reduced.

[0120] Alternatively, in step 11, the UE may send a measurement report on the source cell, which includes the results of Layer 1, Layer 2, or Layer 3 measurements of the candidate cell (e.g., if not completed in step 4).

[0121] In step 12, the UE may decode the remainder of the RRC configuration of some or all of the candidate cells.

[0122] In step 13, the UE may receive a PDCCH instruction on the source cell, which causes the UE to perform a TA on one or more candidate cells. The PDCCH instruction may also cause the UE to send a random access (RA) preamble to the gNB on the PRACH of one or more candidate cells.

[0123] In step 14, the UE may decode the second configuration information of the candidate cell (e.g., if it has not been completed in step 2).

[0124] In step 15, the UE may send the RA preamble on the PRACH of one or more candidate cells among the candidate cells.

[0125] Steps 7 through 10 are executed for the candidate TCI state activation process, and steps 11 through 15 are executed for the early TA acquisition process. Steps 7 through 10 and steps 11 through 15 are independent of each other. When the UE receives a trigger at step 9 or step 13, the UE can perform LTM RRC processing by using the second configuration information. The trigger used to perform LTM RRC processing can be one or both of the TCI state activation MAC CE or PDCCH instructions.

[0126] In step 16, the UE may receive a MAC CE on the source cell, which includes a command to switch the UE from the source cell to the target cell. The target cell may be selected by the gNB from among the candidate cells based on at least one of the Layer 1, Layer 2, or Layer 3 measurements of the candidate cells received in steps 4, 7, or 11.

[0127] Step 17 represents the UE cell handover delay D during the cell handover process. LTM (See above for reference) Figure 4a and Figure 4b (The explanation is as follows).

[0128] The UE can switch from the source cell to the target cell. The UE can do so with a delay of D. LTM It transmits or receives data on the target cell.

[0129] Here, if the second configuration of the target cell has been decoded in step 2, step 8, step 10, step 12, or step 14 before receiving the command to switch the UE from the source cell to the target cell in step 16, then component T can be... TLTM-RRC-processing The processing is set to zero. If the second configuration information of the target cell has not been decoded in steps 2, 8, 10, 12, or 14 before receiving the command to switch the UE from the source cell to the target cell in step 16, then component T can be... TLTM-RRC-processing The processing value is set to a non-zero value. A non-zero value can be the default value (e.g., up to 10ms).

[0130] It should be understood that although steps 1 through 17 are shown in a single signaling diagram, these steps 1 through 17 may not be part of a single implementation. As explained above, one or more steps in steps 1 through 17 may be redundant or optional. One or more steps in steps 1 through 17 may be omitted to be part of a different implementation.

[0131] It is understood that, in the above context, the source cell and the candidate cell can be served by the same gNB (i.e., intra-BS handover) or by another gNB (i.e., inter-BS handover).

[0132] Figure 6A block diagram is shown of a method executed by the UE for managing LTM in 5GS.

[0133] In step 600, the UE may receive RRC configuration for at least one candidate cell on the source cell, wherein the RRC configuration for at least one candidate cell includes first configuration information for performing at least one measurement for at least one candidate cell and second configuration information for switching from the source cell to at least one candidate cell.

[0134] In step 602, the UE can decode the first configuration information.

[0135] In step 604, the UE may perform at least one measurement on at least one candidate cell based on the first configuration information.

[0136] In step 606, the UE may send a measurement report on the source cell that includes at least one result of at least one measurement.

[0137] In step 608, the UE can receive a message on the source cell that triggers the UE to decode the second configuration information.

[0138] In step 610, the UE can decode the second configuration information.

[0139] In step 612, the UE may receive a command on the source cell to switch the UE from the source cell to the target cell selected from at least one candidate cell.

[0140] In step 614, the UE can switch from the source cell to the target cell based on the second configuration information.

[0141] The message may include a request to perform a timed advance acquisition of at least one candidate cell.

[0142] The request may be a PDCCH instruction configured to cause the UE to send a preamble on the PRACH of at least one candidate cell.

[0143] The UE can perform TA acquisition for at least one candidate cell.

[0144] The message may include a request to add at least one TCI state of at least one candidate cell to the list of active TCI states.

[0145] The UE can add at least one TCI to the list of active TCI states.

[0146] This request can be received in MAC CE.

[0147] The UE can determine the delay from which transmission on the target cell begins after the reception of a command to switch the UE from the source cell to the target cell, wherein this delay includes a component responsible for decoding second configuration information after the reception of a command set to zero. The UE can then transmit on the target cell within this delay.

[0148] The UE can transmit data on the PUSCH of the target cell. The UE can transmit control on the PUCCH of the target cell. The UE can transmit preambles on the PRACH of the target cell.

[0149] The delay may also include at least one of the following: a component responsible for sending an acknowledgment of the receipt of a command on the source cell; a component responsible for applying second configuration information to the target cell; a component responsible for obtaining timing information of the target cell; a component responsible for the margin after obtaining the timing information of the target cell; a component responsible for waiting for physical random access channel resources on the target cell; a component responsible for waiting for physical uplink shared channel resources on the target cell; or a component responsible for waiting for physical uplink control channel resources on the target cell.

[0150] This command can be received in MAC CE.

[0151] Figure 7 A block diagram is shown of a method executed by the UE for managing LTM in 5GS.

[0152] In step 700, the UE may receive RRC configuration for at least one candidate cell on the source cell, wherein the RRC configuration for at least one candidate cell includes first configuration information for performing at least one measurement for at least one candidate cell and second configuration information for switching from the source cell to at least one candidate cell.

[0153] In step 702, the UE can decode the first configuration information and the second configuration information.

[0154] In step 704, the UE may receive a command on the source cell to switch the device from the source cell to the target cell selected from at least one candidate cell.

[0155] In step 706, the UE can switch from the source cell to the target cell based on the second configuration information.

[0156] The UE can decode first configuration information and second configuration information in response to receiving RRC configuration information for at least one candidate cell. The UE can perform at least one measurement for the at least one candidate cell based on the first configuration information. The UE can transmit a measurement report on the source cell, which includes at least one result of at least one measurement of the at least one candidate cell.

[0157] The UE may decode first configuration information in response to receiving RRC configuration for at least one candidate cell. The UE may perform at least one measurement for the at least one candidate cell based on the first configuration information. The UE may transmit a measurement report on the source cell, the measurement report including at least one result of at least one measurement for the at least one candidate cell. The UE may decode second configuration information in response to transmitting the measurement report.

[0158] The UE can decode first configuration information in response to receiving radio resource control configuration for at least one candidate cell. The UE can perform at least one measurement for the at least one candidate cell based on the first configuration information. The UE can transmit a measurement report on the source cell, which includes at least one result of the at least one measurement for the at least one candidate cell. The UE can receive a message on the source cell triggering the device to decode second configuration information. The UE can decode the second configuration information. The UE can receive a command on the source cell to switch the UE from the source cell to the target cell.

[0159] The message may include a request to perform a timed advance acquisition of at least one candidate cell.

[0160] The request may be a PDCCH instruction configured to cause the UE to send a preamble on the PRACH of at least one candidate cell.

[0161] The UE can perform TA acquisition for at least one candidate cell.

[0162] The message may include a request to add at least one TCI state of at least one candidate cell to the list of active TCI states.

[0163] The UE can add at least one TCI state of at least one candidate cell to the list of active TCI states.

[0164] This request can be received in MAC CE.

[0165] Commands to switch the UE from the source cell to the target cell can be received in the MAC CE.

[0166] The UE can perform at least one measurement on at least one candidate cell. The UE can send a measurement report on the source cell, which includes at least one result of at least one measurement of at least one candidate cell.

[0167] The source cell and at least one candidate cell can be served by the same base station. Alternatively, the source cell and at least one candidate cell can be served by different base stations.

[0168] The UE can transmit data on the PUSCH of the target cell in at least one of the cells. The UE can transmit control on the PUCCH of the target cell in at least one of the cells. The UE can transmit a preamble on the PRACH of the target cell in at least one of the cells.

[0169] Figure 8 A schematic diagram is shown of a non-volatile storage medium for storing instructions, which allow the processor to execute these instructions when they are executed by the processor. Figure 6 and Figure 7 One or more steps in the method.

[0170] Note that while some embodiments have been described for 5GS, similar principles can be applied to other communication systems. Therefore, although certain embodiments have been described by way of example with reference to certain example architectures of wireless networks, technologies, and standards, these embodiments can be applied to any other suitable form of communication system besides those shown and described herein.

[0171] It is also noted in this document that although exemplary embodiments have been described above, several changes and modifications may be made to the disclosed solutions without departing from the scope of the invention.

[0172] As used in this article, "at least one" should be interpreted as "one or more".

[0173] As used herein, “at least one of the following: ” and “<at least one of the list of two or more elements>”, and similar wording (where the list of two or more elements is connected by “and” or “or”) means at least any one of these elements, or at least any two or more of these elements, or at least all of these elements. Similarly, phrases such as “X and / or Y” or “X / Y” can be considered to cover only X, only Y, or both X and Y.

[0174] When we say that a node or element (e.g., a UE or gNB) "determines" information, this can be considered to cover the various ways in which the node becomes aware of or acquires that information. For example, determining may include performing one or more processing steps. Determining may also cover, for example, receiving information from another entity.

[0175] In general, various embodiments can be implemented in hardware or dedicated circuitry systems, software, logic, or any combination thereof. Some aspects of this disclosure can be implemented in hardware, while others can be implemented in firmware or software that can be executed by a controller, microprocessor, or other computing device, but this disclosure is not limited thereto. While various aspects of this disclosure may be shown and described as block diagrams, flowcharts, or using some other graphical representation, it is well understood that, by way of non-limiting example, these blocks, apparatuses, systems, techniques, or methods described herein can be implemented in hardware, software, firmware, dedicated circuitry or logic, general-purpose hardware or controllers or other computing devices, or some combination thereof.

[0176] As used in this application, the term "circuit system" may refer to one or more or all of the following: (a) Pure hardware circuit implementation (such as implementations only in analog and / or digital circuit systems) and (b) A combination of hardware circuitry and software, such as (if applicable): (i) A combination of (multiple) analog and / or digital hardware circuits and software / firmware, and (ii) Any part of a hardware processor(s) having software (including (multiple) digital signal processors, software, and (multiple) memories, which work together to cause a device such as a mobile phone or server to perform various functions), and (c) (Multiple) hardware circuits and / or (multiple) processors, such as (multiple) microprocessors or a portion thereof, which require software (e.g., firmware) to operate, but may be absent when operation is not required.

[0177] This definition of circuit system applies to all uses of the term in this application, including in any claim. As another example, as used herein, the term circuit system also covers implementations of hardware circuitry or processors (or processors) or portions thereof and their accompanying software and / or firmware. For instance, if applicable to a particular claim element, the term circuit system also covers baseband integrated circuits or processor integrated circuits for mobile devices, or similar integrated circuits in servers, cellular network devices, or other computing or networking devices.

[0178] Embodiments of this disclosure can be implemented by computer software executable by the data processor of a mobile device, such as in a processor entity, or by hardware, or by a combination of software and hardware. Computer software or programs (also referred to as program products, including software routines, applets, and / or macros) can be stored in any device-readable data storage medium, and they include program instructions for performing specific tasks. A computer program product may include one or more computer-executable components that, when the program is run, are configured to perform the embodiments. The one or more computer-executable components may be at least one piece of software code or a portion thereof.

[0179] Furthermore, it should be noted in this regard that any block of the logic flow shown in the figure can represent a program step, or an interconnected logic circuit, block and function, or a combination of program steps and logic circuits, blocks and functions. Software can be stored on physical media, such as memory chips or memory blocks implemented within a processor, magnetic media such as hard disks or floppy disks, and optical media such as DVDs and their data variants, CDs. The physical media can be non-transitory.

[0180] As used herein, the term "non-transient" refers to a limitation on the medium itself (i.e., tangible, not signal-based), rather than a limitation on the persistence of data storage (e.g., RAM vs. ROM). The memory can be of any type suited to the local technological environment and can be implemented using any suitable data storage technology, such as semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed-state memory, and removable memory. The data processor can be of any type suited to the local technological environment and, by way of non-limiting example, can include one or more of general-purpose computers, special-purpose computers, microprocessors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), FPGAs, gate-level circuits, and processors based on multi-core processor architectures. Embodiments of this disclosure can be implemented in various components such as integrated circuit modules. The design of integrated circuits is largely a highly automated process. Complex and powerful software tools can be used to translate logic-level designs into semiconductor circuit designs for etching and formation on semiconductor substrates.

[0181] The scope of protection sought by the various embodiments of this disclosure is defined by the independent claims. Embodiments and features described in this specification that are not within the scope of the independent claims (if any) are to be interpreted as examples that aid in understanding the various embodiments of this disclosure.

[0182] The foregoing description provides a complete and informative description of exemplary embodiments of the present disclosure by way of non-limiting examples. However, various modifications and adaptations will be apparent to those skilled in the art when read in conjunction with the accompanying drawings and appended claims, given the foregoing description. Nevertheless, all such and similar modifications to the teachings of this disclosure will still fall within the scope of the invention as defined in the appended claims. Indeed, further embodiments may include combinations of one or more embodiments with any other embodiments discussed above.

Claims

1. An apparatus comprising: Components for receiving radio resource control configuration for at least one candidate cell on a source cell, wherein the radio resource control configuration for the at least one candidate cell includes first configuration information for performing at least one measurement for the at least one candidate cell and second configuration information for switching from the source cell to the at least one candidate cell; A component for decoding the first configuration information in response to receiving the radio resource control configuration for the at least one candidate cell; A component for performing at least one measurement for the at least one candidate cell based on the first configuration information; A component for decoding the second configuration information in response to the following: (i) Sending a measurement report on the source cell that includes at least one result of the at least one measurement for the at least one candidate cell. (ii) A request to perform a timed advance acquisition for the at least one candidate cell is received on the source cell, or (iii) A request is received on the source cell to add at least one transmission configuration information status of the at least one candidate cell to the list of active transmission configuration information statuses; A component for receiving, on the source cell, a command to switch the device from the source cell to a target cell selected from the at least one candidate cell; as well as A component used to switch from the source cell to the target cell based on the second configuration information.

2. The apparatus of claim 1, wherein the request to perform a timed advance acquisition for the at least one candidate cell is configured to cause the apparatus to transmit a physical downlink control channel instruction with a preamble on the physical random access channel of the at least one candidate cell.

3. The apparatus according to claim 1 or 2, wherein the apparatus comprises: A component for performing timed advance acquisition for the at least one candidate cell.

4. The apparatus according to claim 1, comprising: A component for adding the at least one transmission configuration information status of the at least one candidate cell to the active transmission configuration information status list.

5. The apparatus according to any one of claims 1 to 4, wherein the request to add at least one transmission configuration information status of the at least one candidate cell to the active transmission configuration information status list is received in the media access control unit.

6. The apparatus according to any one of claims 1 to 5, wherein the command to switch the apparatus from the source cell to the target cell is received in the media access control unit.

7. The apparatus according to any one of claims 1 to 6, wherein the apparatus comprises: Components for performing at least one measurement on the source cell; as well as A component for transmitting a measurement report on the source cell that includes at least one result of the at least one measurement of the source cell.

8. The apparatus according to any one of claims 1 to 7, wherein the source cell and the at least one candidate cell are served by the same base station; or The source cell and the at least one candidate cell are served by different base stations.

9. The apparatus according to any one of claims 1 to 8, wherein the apparatus comprises: Components for transmitting data on the physical uplink shared channel of the target cell in the at least one cell; A component for transmitting control on the physical uplink control channel of the target cell in the at least one cell; or A component for transmitting a preamble on the physical random access channel of the target cell in the at least one cell.

10. The apparatus according to any one of claims 1 to 9, wherein the apparatus is a user equipment.

11. The apparatus according to any one of claims 1 to 10, wherein the apparatus comprises: At least one processor; And at least one memory, the at least one memory storing instructions that, when executed by the at least one processor, cause performance issues in the device.

12. A method comprising: Receive radio resource control configuration for at least one candidate cell on the source cell, wherein the radio resource control configuration for the at least one candidate cell includes first configuration information for performing at least one measurement for the at least one candidate cell and second configuration information for switching from the source cell to the at least one candidate cell; In response to receiving the radio resource control configuration for the at least one candidate cell, the first configuration information is decoded; Perform at least one measurement for the at least one candidate cell based on the first configuration information; The second configuration information is decoded in response to the following: (i) Sending a measurement report on the source cell that includes at least one result of the at least one measurement for the at least one candidate cell. (ii) A request to perform a timed advance acquisition for the at least one candidate cell is received on the source cell, or (iii) A request is received on the source cell to add at least one transmission configuration information status of the at least one candidate cell to the list of active transmission configuration information statuses; Receive on the source cell a command to switch the device from the source cell to a target cell selected from the at least one candidate cell; as well as The process of switching from the source cell to the target cell is based on the second configuration information.

13. The method of claim 12, wherein the request to perform a timed advance acquisition for the at least one candidate cell is configured to cause the device to transmit a physical downlink control channel instruction with a preamble on the physical random access channel of the at least one candidate cell.

14. The method according to claim 12 or 13, wherein the method comprises: A timed advance acquisition is performed for the at least one candidate cell.

15. The method of claim 12, comprising: Add the at least one transmission configuration information status of the at least one candidate cell to the active transmission configuration information status list.

16. The method according to any one of claims 12 to 15, wherein the request to add at least one transmission configuration information state of the at least one candidate cell to the active transmission configuration information state list is received in the media access control unit.

17. The method according to any one of claims 12 to 16, wherein the command to switch the device from the source cell to the target cell is received in the medium access control unit.

18. The method according to any one of claims 12 to 17, wherein the method comprises: Data is transmitted on the physical uplink shared channel of the target cell in at least one of the cells; Control is transmitted on the physical uplink control channel of the target cell in at least one of the cells; or A preamble is transmitted on the physical random access channel of the target cell in at least one of the cells.

19. A computer-readable medium comprising instructions that, when executed by a means, cause the means to perform at least the following: Receive radio resource control configuration for at least one candidate cell on the source cell, wherein the radio resource control configuration for the at least one candidate cell includes first configuration information for performing at least one measurement for the at least one candidate cell and second configuration information for switching from the source cell to the at least one candidate cell; In response to receiving the radio resource control configuration for the at least one candidate cell, the first configuration information is decoded; Perform at least one measurement for the at least one candidate cell based on the first configuration information; The second configuration information is decoded in response to the following: (i) Sending a measurement report on the source cell that includes at least one result of the at least one measurement for the at least one candidate cell. (ii) A request to perform a timed advance acquisition for the at least one candidate cell is received on the source cell, or (iii) A request is received on the source cell to add at least one transmission configuration information status of the at least one candidate cell to the list of active transmission configuration information statuses; Receive on the source cell a command to switch the device from the source cell to a target cell selected from the at least one candidate cell; as well as The process of switching from the source cell to the target cell is based on the second configuration information.

20. A non-transitory computer-readable medium comprising program instructions that, when executed by a device, cause the device to perform at least: Receive radio resource control configuration for at least one candidate cell on the source cell, wherein the radio resource control configuration for the at least one candidate cell includes first configuration information for performing at least one measurement for the at least one candidate cell and second configuration information for switching from the source cell to the at least one candidate cell; In response to receiving the radio resource control configuration for the at least one candidate cell, the first configuration information is decoded; Perform at least one measurement for the at least one candidate cell based on the first configuration information; The second configuration information is decoded in response to the following: (i) Sending a measurement report on the source cell that includes at least one result of the at least one measurement for the at least one candidate cell. (ii) A request to perform a timed advance acquisition for the at least one candidate cell is received on the source cell, or (iii) A request is received on the source cell to add at least one transmission configuration information status of the at least one candidate cell to the list of active transmission configuration information statuses; Receive on the source cell a command to switch the device from the source cell to a target cell selected from the at least one candidate cell; as well as The process of switching from the source cell to the target cell is based on the second configuration information.

21. An apparatus comprising at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus to perform: Receive radio resource control configuration for at least one candidate cell on the source cell, wherein the radio resource control configuration for the at least one candidate cell includes first configuration information for performing at least one measurement for the at least one candidate cell and second configuration information for switching from the source cell to the at least one candidate cell; In response to receiving the radio resource control configuration for the at least one candidate cell, the first configuration information is decoded; Perform at least one measurement for the at least one candidate cell based on the first configuration information; The second configuration information is decoded in response to the following: (i) Sending a measurement report on the source cell that includes at least one result of the at least one measurement for the at least one candidate cell. (ii) A request to perform a timed advance acquisition for the at least one candidate cell is received on the source cell, or (iii) A request is received on the source cell to add at least one transmission configuration information status of the at least one candidate cell to the list of active transmission configuration information statuses; On the source cell, a command is received to switch the device from the source cell to a target cell selected from the at least one candidate cell; as well as The process of switching from the source cell to the target cell is based on the second configuration information.

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