Early indication for dual connectivity and / or carrier aggregation

Abstract

A method comprising: monitoring whether a base station, in a connection establishment procedure for a connection between a terminal and the base station in a connected state, receives an indication from a terminal that a condition has been met by a performance measurement of at least one candidate cell performed while the terminal was not in a connected state, wherein the connection establishment procedure includes a random access procedure, or a connection setup request, or a connection reactivation request; and, if an indication is received, requesting each of the candidate cells to prepare as a secondary cell for the terminal's carrier aggregation or dual connectivity; determining a suitable cell among the candidate cells, wherein the performance measurement of the suitable cell meets the condition; providing the terminal with a configuration that includes the suitable cell as a secondary cell; and notifying the suitable cell that the terminal is configured with the suitable cell as a secondary cell.

Description

Technical Field

[0001] This disclosure relates to dual connectivity and / or carrier aggregation.

[0002] Abbreviations 3GPP 3rd Generation Partnership Project 5G / 6G / 7G 5th / 6th / 7th Generation AMF Access and Mobility Function AoA Angle of Arrival AR Augmented Reality AS Access Stratum CA Carrier Aggregation CM Connection Management CSSF Carrier-Specific Scaling Factor DC Dual Connectivity DL Downlink DN Domain Name DRB Data Radio Bearer DRX Discontinuous Reception EMR Early Measurement Report FR Frequency Range gNB Next Generation NodeB IAB-MT Integrated Access and Backhaul-Mobile Termination I-RNTI Inactive RNTI MN Master Node Msg Message NAS Non-Access Stratum NR New Radio PDU Protocol Data Unit PRACH Physical Random Access Channel PSCell Primary Serving Cell RA Random Access RAN Radio Access Network RNTI Radio Network Temporary Identifier RRC Radio Resource Control RRM Radio Resource Management RSRP Reference Signal Received Power RSRQ Reference Signal Reception Quality Rx Receiver SCell Secondary Cell SCG Secondary Cell Group SgNB docigNB SMTC SSB-based RRM measurement timing configuration SN Secondary Node SRB Signaling Radio Bearer SSB Synchronization Signal Block TDM time division multiplexing TR Technical Report TS Technical Specifications Tx transmitter UE User Equipment UL Uplink URLLC: Ultra-high reliability, low latency communication XR Extended Reality [Background technology]

[0003] In carrier aggregation (CA), the capabilities of radio cells in separate frequency allocations are combined. The UE first connects to one carrier for both uplink and downlink; this is the PCell. Secondary DL carriers can then be added (SCells).

[0004] Dual connectivity (DC) enables the aggregation of two radio links with a non-ideal backhaul without low latency requirements. To enable this, the links are aggregated at the PDCP level by combining PDCP PDUs. This differs from carrier aggregation (CA), which combines MAC layer blocks. In resource aggregation, a UE in the RRC_CONNECTED state is allocated two radio links from two different network nodes connected via a non-ideal backhaul, utilizing normal X2 connectivity. The nodes play different roles. Macrocells act as mobility and signaling anchors (referred to as master eNBs that terminate S1-MMEs), while small cells act as local "capacity boosters" (referred to as secondary eNBs, providing additional radio resources to the UE). The two resource sets involved in the process are called the master cell group (associated with MCG and MeNB, and consisting of a PCell and 0, 1, or more SCells) and the secondary cell group (associated with SCG and SeNB, and consisting of a PSCell (primary SCell) and 0, 1, or more SCells). The term "MN" refers to any PCell and SCell of the MCG, and the term "SN" refers to any PSCell and SCell of the SCG.

[0005] For the purposes of this application, DC and CA can be used interchangeably. That is, unless otherwise stated, if a description relates to either DC or CA, that description is applicable to the other DC or CA accordingly. Typically, this equivalence is represented by "DC / CA," meaning any one of DC or CA.

[0006] For the purposes of this application, unless otherwise indicated, the terms "idle mode" and "connected mode" are used such that the UE is in both RRC idle mode and CM idle mode, and in both RRC connected mode and CM connected mode. The gNB does not maintain the UE context in RRC idle mode, but the last serving gNB maintains the UE context while the UE is in RRC_INACTIVE mode. Thus, the UE is in CM connected mode when in RRC inactive mode.

[0007] As proposed in the Release-18 Further NR Mobility Enhancements work item description [3GPP RP-213565], the objective is to study FR2 SCG / SCell measurement acquisition procedures and investigate potential enhancements and mechanisms to improve the FR2 DC / CA setup / resumption delay for users in RRC idle / inactive states.

Summary of the Invention

[0008] The object of the present invention is to improve the prior art.

[0009] According to a first aspect of the present invention, an apparatus comprising one or more processors and a memory storing instructions, which when executed by the one or more processors cause the apparatus to monitor whether the base station receives an indication that a condition is satisfied by at least one performance measurement of at least one of one or more candidate cells executed by the terminal while the terminal is not in the connected state, within a terminal connection establishment procedure for establishing a connection between the terminal and the base station in the connected state, the connection establishment procedure including at least one of a random access procedure of the terminal, or a connection setup request of the terminal, or a connection resume request of the terminal, when the indication is received from the terminal · Require each of one or more candidate cells to be prepared as a secondary cell for carrier aggregation or dual connectivity of the terminal, · Determine an appropriate cell among one or more candidate cells, where the performance measurement of the appropriate cell meets the conditions, · Provide the terminal with a configuration including the appropriate cell as a secondary cell, · Notify the appropriate cell that the terminal is configured using the appropriate cell as a secondary cell, An apparatus is provided that causes the above to be executed.

[0010] When the instructions are executed by one or more processors, the apparatus is further caused to Provide the terminal with one or more sets of preambles, Monitoring whether an indication that the condition is satisfied by the performance measurement of at least one candidate cell is received from the terminal within the connection establishment procedure of the terminal includes monitoring whether the terminal uses one of the preambles of one or more sets of preambles in the random access procedure.

[0011] When the instructions are executed by one or more processors, the apparatus is further caused to Provide the terminal with an indication of a dedicated random access channel occasion, Monitoring whether an indication that the condition is satisfied by the performance measurement of at least one candidate cell is received from the terminal within the connection establishment procedure of the terminal by monitoring whether the terminal selects a dedicated random access channel occasion in the random access procedure, And further cause the above to be executed.

[0012] When the instructions are executed by one or more processors, the apparatus is further caused to By monitoring whether the terminal provides explicit indications in connection setup requests or connection resume requests, it is possible to perform monitoring within the terminal's connection establishment procedure to check whether an indication is received from the terminal that a condition has been met by a performance measurement of at least one candidate cell.

[0013] When an instruction is executed by one or more processors, the device, To provide the terminal with a measurement configuration for performance measurement, or Providing conditions to the device, At least one of these can be made to perform an additional action.

[0014] When an instruction is executed by one or more processors, if there are two or more candidate cells, the device will, Further actions can be taken to free up candidate cells that are different from the appropriate cells, preventing them from becoming secondary cells in the device's carrier aggregation or dual connectivity.

[0015] When an instruction is executed by one or more processors, if there are two or more candidate cells, the device will, The terminal is provided with a configuration that includes a cell suitable as a secondary cell, by providing the terminal with a configuration for each candidate cell, wherein each configuration includes each candidate cell as a secondary cell. The terminal is instructed to select the appropriate cell from the candidate cells and apply only the configuration of the appropriate cell. It can be made to execute.

[0016] When an instruction is executed by one or more processors, the device, The terminal can be made to provide the terminal with the configuration for each of the candidate cells prior to requesting a performance measurement report.

[0017] When an instruction is executed by one or more processors, if there are two or more candidate cells, the device will, By providing the terminal with configurations that include the appropriate cell as a secondary cell after determining the appropriate cell, it is possible to ensure that the terminal is provided with configurations that include the appropriate cell as a secondary cell.

[0018] The indication can include the appropriate cell indication.

[0019] When an instruction is executed by one or more processors, the device, Requesting a performance measurement report from the device, By analyzing the performance measurement report, we can determine the appropriate cell from a group of candidate cells, This can be made to perform further actions.

[0020] When an instruction is executed by one or more processors, the device, Based on information about the primary cell to which the terminal is camped, it can be further performed to estimate candidate cells from a set of potential candidate cells.

[0021] Performance measurements may include early measurement reports.

[0022] According to a second aspect of the present invention, the apparatus is, The device comprises one or more processors and memory for storing instructions, and when an instruction is executed by one or more processors, the device... The system monitors whether to perform performance measurements on one or more candidate cells while the terminal is disconnected and not connected, If the device is disconnected and performance measurements are performed while it is not connected, • Check whether at least one of the performance measurements meets the conditions, • Supervising whether a terminal intends to connect to a base station in a connected state through a connection establishment procedure, wherein the connection establishment procedure includes at least one of the following: a random access procedure for the terminal, a terminal connection setup request, or a terminal connection resumption request. If at least one of the performance measurements satisfies the condition, and the terminal intends to connect with the base station in a connected state by the connection establishment procedure, the terminal shall provide an indication to the base station within the connection establishment procedure, the indication shall indicate that at least one of the performance measurements satisfies the condition. A device is provided to perform this action.

[0023] When an instruction is executed by one or more processors, the device, This can be done by providing an explicit indication in a connection setup request or a connection resume request.

[0024] When an instruction is executed by one or more processors, the device, The terminal can be further made to monitor whether it receives one or more preambles, and when the instruction is executed by one or more processors, the device will In a random access procedure, it is possible to perform an action that provides an indication by using one of the preambles from a set of one or more preambles.

[0025] When an instruction is executed by one or more processors, the device, The device can further monitor whether the terminal receives an indication of a random access channel opportunity, and when the instruction is executed by one or more processors, the device will be instructed to do so. It is possible to perform an action that provides indication by selecting random access channel opportunities in a random access procedure.

[0026] When an instruction is executed by one or more processors, the device, To receive a measurement configuration for performance measurement, or, Receiving the conditions, At least one of these can be made to perform an additional action.

[0027] When an instruction is executed by one or more processors, the device, The monitoring involves checking whether the terminal receives a configuration from the base station, the configuration including one of the candidate cells as the terminal's secondary cell, When a device receives a configuration, it applies the configuration to the device, This can be made to perform further actions.

[0028] When the instruction is executed by one or more processors, if the measurement configuration includes performance measurements of two or more candidate cells, the device will, The terminal monitors whether it receives from the base station, for each candidate cell, a command to select only one of the components and the configuration, wherein each configuration includes the respective candidate cell as a secondary cell of the terminal. When the terminal receives the configuration and instructions of candidate cells, it selects one of the candidate cells based on the results of performance measurements of the candidate cells, Apply only the configuration of the selected candidate cells to the terminal, This can be made to perform further actions.

[0029] The indication can further show candidate cells that meet the performance measurement criteria.

[0030] Performance measurements may include early measurement reports.

[0031] According to a third aspect of the present invention, The base station monitors, in the terminal connection establishment procedure for establishing a connection between the terminal and the base station in a connected state, whether it receives an indication from the terminal that a condition has been met by a performance measurement of at least one of one or more candidate cells performed while the terminal was not in a connected state, wherein the connection establishment procedure includes at least one of the terminal random access procedure, or the terminal connection setup request, or the terminal connection reactivation request. If the indication is received from the device, • Requesting each of one or more candidate cells to be prepared as a secondary cell for terminal carrier aggregation or dual connectivity, • Determining an appropriate cell from a group of candidate cells, and determining that the performance of the appropriate cell meets the conditions. • To provide the terminal with a configuration that includes a cell suitable as a secondary cell, • Notify the appropriate cell that the terminal is configured using the appropriate cell as a secondary cell, A method is provided that includes this.

[0032] The method is, This may further include providing the terminal with a set of one or more preambles. Monitoring whether an indication is received from the terminal that a condition is met by performance measurement of at least one candidate cell within the terminal connection establishment procedure may include monitoring whether the terminal uses one of the preambles from one or more sets of preambles in the random access procedure.

[0033] The method is, This may further include providing the terminal with indications for dedicated random access channel opportunities. Monitoring whether an indication is received from the terminal that the condition is met by performance measurement of at least one candidate cell within the terminal connection establishment procedure may include monitoring whether the terminal selects a dedicated random access channel opportunity in the random access procedure.

[0034] Monitoring whether an indication is received from the terminal that a condition has been met by performance measurement of at least one candidate cell within the terminal connection establishment procedure may include monitoring whether the terminal provides an explicit indication in a connection setup request or a connection resume request.

[0035] The method is, To provide the terminal with a measurement configuration for performance measurement, or Providing conditions to the device, It can further include:

[0036] The method is, This may further include freeing up candidate cells that are different from the appropriate cells so that they do not become secondary cells in the device's carrier aggregation or dual connectivity.

[0037] Providing a terminal with a configuration that includes a suitable cell as a secondary cell may include providing the terminal with a configuration for each of the candidate cells, each of which includes each of the candidate cells as a secondary cell, and the method is The system may further include instructing the terminal to select the appropriate cell from the candidate cells and to apply only the configuration of the appropriate cell.

[0038] The terminal can provide the respective configuration for each of the candidate cells prior to requesting a performance measurement report from the terminal.

[0039] Providing a terminal with a configuration that includes a cell suitable as a secondary cell may include providing the terminal with only a configuration that includes a cell suitable as a secondary cell after the appropriate cell has been determined.

[0040] The indication can include the appropriate cell indication.

[0041] The method is, This could further include requesting a performance measurement report from the device. Determining the appropriate cell from one or more candidate cells can be done by analyzing performance measurement reports.

[0042] The method is, This may further include estimating candidate cells from a set of potential candidate cells based on information about the primary cell to which the terminal is camped.

[0043] Performance measurements may include early measurement reports.

[0044] According to a fourth aspect of the present invention, The method includes one or more processors and memory for storing instructions, and when an instruction is executed by one or more processors, The system monitors whether to perform performance measurements on one or more candidate cells while the terminal is disconnected and not connected, If the device is disconnected and performance measurements are performed while it is not connected, • Check whether at least one of the performance measurements meets the conditions, • Supervising whether a terminal intends to connect to a base station in a connected state through a connection establishment procedure, wherein the connection establishment procedure includes at least one of the following: a random access procedure for the terminal, a terminal connection setup request, or a terminal connection resumption request. If at least one of the performance measurements satisfies the condition, and the terminal intends to connect with the base station in a connected state by the connection establishment procedure, the terminal shall provide an indication to the base station within the connection establishment procedure, the indication shall indicate that at least one of the performance measurements satisfies the condition. A method is provided to perform this action.

[0045] Providing this may include providing explicit indications in connection setup requests or connection resumption requests.

[0046] The method is, This may further include monitoring whether the terminal receives one or more sets of preambles. Providing an indication may include using one of a set of preambles in a random access procedure.

[0047] The method is, This further includes monitoring whether the terminal receives an indication of a random access channel opportunity, Providing indications may include selecting random access channel opportunities in random access procedures.

[0048] The method is, To receive a measurement configuration for performance measurement, or, Receiving the conditions, It may further include at least one of the following.

[0049] The method is, The monitoring involves checking whether the terminal receives a configuration from the base station, the configuration including one of the candidate cells as the terminal's secondary cell, When a device receives a configuration, it applies the configuration to the device, It can further include:

[0050] The method is as follows: If the measurement configuration includes performance measurements of two or more candidate cells, The terminal monitors whether it receives from the base station, for each candidate cell, a command to select only one of the components and the configuration, wherein each configuration includes the respective candidate cell as a secondary cell of the terminal. When the terminal receives the configuration and instructions of candidate cells, it selects one of the candidate cells based on the results of performance measurements of the candidate cells, Apply only the configuration of the selected candidate cells to the terminal, It can further include:

[0051] The indication can further show candidate cells that meet the performance measurement criteria.

[0052] Performance measurements may include early measurement reports.

[0053] Each of the third and fourth embodiments of the method may be a dual connectivity and / or carrier aggregation method.

[0054] According to a fifth aspect of the present invention, a computer program product is provided which, when executed on a device, includes a set of instructions configured to cause the device to perform the method according to either the third or fourth aspect. The computer program product can be embodied as a computer-readable medium or can be directly loaded onto a computer.

[0055] According to some embodiments of the present invention, at least one of the following advantages can be achieved. • UEs are connected quickly via secondary nodes.

[0056] It is understood that any of these changes may be applied individually or in combination with the respective embodiments they refer to, unless otherwise explicitly stated to exclude alternatives.

[0057] Further details, features, purposes, and advantages will become apparent from the following detailed description of preferred embodiments of the invention, in conjunction with the accompanying drawings. [Brief explanation of the drawing]

[0058] [Figure 1] This figure shows the EMR measurement and functionality of the T331 timer using conventional technology. [Figure 2] This figure shows a message sequence chart for the transition from idle mode to connected mode in EMR measurement using conventional technology. [Figure 3] This figure shows a message sequence chart of the transition from inactive mode to connected mode in EMR measurement using conventional technology. [Figure 4] This figure shows a message sequence chart of the transition from idle mode to connected mode in EMR measurement according to some exemplary embodiments of the present invention. [Figure 5] This figure shows a message sequence chart for the transition from inactive mode to connected mode in EMR measurement, according to some exemplary embodiments of the present invention. [Figure 6] This figure shows an apparatus according to an exemplary embodiment of the present invention. [Figure 7] This figure shows a method according to an exemplary embodiment of the present invention. [Figure 8] This figure shows an apparatus according to an exemplary embodiment of the present invention. [Figure 9] This figure shows a method according to an exemplary embodiment of the present invention. [Figure 10] This figure shows an apparatus according to an exemplary embodiment of the present invention. [Modes for carrying out the invention]

[0059] Certain embodiments of the present invention are described below in detail with reference to the accompanying drawings. Herein, the features of the embodiments can be freely combined with each other unless otherwise stated. However, it should be clearly understood that the description of certain embodiments is given merely as examples and is not intended in any way to be understood as limiting the present invention to the disclosed details.

[0060] Furthermore, while the apparatus is configured to perform the corresponding method, in some cases only the apparatus or only the method is described.

[0061] Millimeter wave (mm wave) communication Compared to FF1, gNBs typically feature a relatively large number of antenna elements to compensate for further propagation path losses in transmissions at mm-wave frequencies (e.g., FR2), where the signal is beamformed and transmitted through different spatially filtered narrowband beams.

[0062] Unlike the FR1 device architecture, where the majority of devices are constructed with a single antenna panel (with spherical coverage), in FR2, to provide complete spatial coverage, devices are expected to have multiple directional antenna panels (Rx / Tx beams) located on different sides of the device, each covering a portion of the space. In the NR network, the initial connection (cell detection / measurement) establishment procedure and beam selection phase are performed by measuring the SSB broadcast from the gNB through different spatial filters that are multiplexed and swept using a TDM scheme. In NR FR2, UE cell detection and measurement times are relaxed compared to FR1 due to the assumption of multiple UE antenna panels (in typical directional Rx and Tx). Currently, RAN4 assumes that the user can receive from only one Rx panel (one spatial direction) at a time. Therefore, in order to properly measure the cell / carrier frequency, the UE is expected to continuously measure the reference signal by sweeping its receiving panel, which results in additional measurement time compared to that required for a single-panel UE, such as those typically used in FR1 [3GPP TS38.133].

[0063] Interfrequency measurements to establish DC / CA To improve user throughput and data transmission latency (e.g., by reducing packet queuing / buffering delays), and to improve reliability, it is crucial to reduce secondary link establishment / restart delays for PSCell / SCell setup in DC / CA operation scenarios. This is especially true for UEs connecting from idle / inactive states where network information is limited in terms of available UE measurement status.

[0064] To set up a DC / CA connection, the UE must perform measurements and report the configured inter-frequency carriers. Measurement acquisition delay has been shown to be a major component contributing to the DC / CA setup delay [3GPP R4-2212869].

[0065] For example, based on the connected mode UE measurement requirements provided in [3GPP TS38.133] and the performed analysis detailed in [3GPP R4-2212869], gap-assisted measurement, FR2 UE (Mpss / sss_sync_inter=40, Mmeas_period_inter=40, M SSB_index_inter =24), and SMTC periodicity of 40 msec, no DRX, 40 msec measurement gap repetition period (MGRP), and no concurrently configured / concurrent measurements (i.e., CSSF inter Assuming =1), the measurement acquisition delay is equal to the following: T(FR2) identify_inter_with_index =(T PSS / SSS_sync_inter +T SSB_measurement_period_inter +T SSB_time_index_inter ) = 40*40 + 40*40 + 24*40 = 4160 msec

[0066] To avoid such high latency, especially for UEs connecting from idle / inactive mode, an EMR (Electromagnetic Resonance) mechanism was proposed in NR Rel-16 that enables faster DC / CA setup by configuring the UE to perform measurements in idle / inactive mode for potential DC / CA frequencies / cells (EMR measurements) while a specific timer (T331) is running. These measurements are typically performed on a carrier different from the Pcell's carrier. The UE prepares a report of the EMR measurements and sends it to the network when it enters RRC connection mode. This eliminates the need for measurements in connection mode. Once T331 expires, it is up to the UE to decide whether to continue the measurements. Figure 1 shows an example of a UE transitioning from connection mode to idle mode, then to the T331 timer expiration event, and back to connection mode.

[0067] Figure 2 shows the corresponding message sequence chart for the transition from idle mode to connected mode using conventional technology. The actions are essentially as follows: - Action #1: The UE is in idle mode and performs EMR measurements of the DC / CA carrier. - Actions #2-3: The UE sends a pre-configured RA preamble and receives an RA response from the gNB. These actions form a "random access procedure". - Action #4: The UE requests the gNB to set up a new connection from RRC_IDLE by sending an RRC setup request message. - Action #5: The gNB sends an RRC setup response to the UE. - Action #6: UE is in RRC connection mode, but is still in CM idle mode. - Action #7: The UE sends an RRC setup complete message to the network. This may include an EMR availability indication. - Action #8: RRCSetupComplete: The first NAS message from the UE, which is piggybacked, is sent to the AMF. - Action #9: Here, the UE is in RRC connection mode and CM connection mode. - Actions #10-13: Additional NAS messages can be exchanged between the UE and AMF. See 3GPP TS 23.502. - Action 14: The AMF prepares the UE context data (including PDU session context, security key, UE radio capability and security capability, etc.) and sends it to the gNB. - Actions #15-16: gNB uses UE to activate AS security. - Actions #17-18: gNB will perform reconfiguration to set up SRB2 and DRB for UE, or SRB2 and DRB optionally for IAB-MT. - Action #19: gNB notifies AMF that the setup procedure is complete. - Actions #20-21: The gNB sends an EMR measurement request to the UE, and the UE responds by sending an EMR measurement report.

[0068] Figure 3 shows the transition of the UE from RRC_INACTIVE mode to RRC_CONNECTED mode, triggered by the UE, using conventional technology. The actions are essentially as follows: - Action #1: The UE is in inactive mode and performs EMR measurements of DC / CA carriers. - Actions #2-3: The UE sends a pre-configured RA preamble and receives an RA response from the gNB. These actions form a "random access procedure". - Action #4: The UE resumes the RRC connection from RRC_INACTIVE and provides the I-RNTI allocated by the last serving gNB. - Action #5: gNB requests that the last serving gNB provide UE context data if it is possible to resolve the gNB identity contained in I-RNTI. - Action #6: The last serving gNB provides UE context data. - Actions #7-9: The gNB and UE complete the reactivation of the RRC connection, and the UE reports EMR measurements to the network. - Action #10: If loss of buffered DL user data is prevented in the last serving gNB, the gNB provides a forwarding address. - Actions #11-12: Additional NAS messages can be exchanged between the UE and AMF. See 3GPP TS23.502. - Action #13: gNB triggers the release of UE resources in the last serving gNB.

[0069] As described above in this specification, in order to initiate preparation and establish PScell / Scell ​​in the DC / CA, the network awaits EMR measurements available after full connectivity establishment (and security key exchange). This includes processing time in addition to the exchange of several messages between the UE and the network. These actions delay the DC / CA setup. This is particularly detrimental in applications with high throughput and low latency requirements (XR, AR, etc.), or in applications where the DC / CA requires enhanced reliability, such as ultra-high reliability low latency communication (URLLC).

[0070] Some exemplary embodiments of the present invention accelerate DC / CA setup for a UE to transition from RRC idle mode or RRC inactive mode to RRC connected mode.

[0071] According to some exemplary embodiments of the present invention, the UE provides EMR-related information to the network in a connection establishment procedure that includes a random access procedure (for example, when sending an RA preamble). Some key actions are as follows: - Action #1: Configure the UE to perform EMR measurements (including enhanced EMR configurations, e.g., rel-18 eEMR configurations), i.e., performance measurements in idle or inactive mode. - Action #2: The network assigns a set of RA preambles to the UE and configures the UE to use these when performing RA if certain conditions are met during EMR measurement evaluation. For example, this could be detecting cells with quality and / or power (RSRQ and / or RSRP) thresholds that exceed certain thresholds (additional details / examples are provided below). The network can also provide conditions to the UE, or conditions can be predefined in the UE. If the network provides conditions, they typically take precedence over pre-configured conditions. - Action #3: During RA, if the measurement conditions are met, the UE performs RA by sending preambles across a set of RA preambles. - Action #4: Based on the received indications, and potentially by combining this with the location information of PCells during camping (AoA estimated beams and PCell locations accessed during RACH), the network can estimate potential PSCells / SCells and prepare them for DC / CA. - Action #5: After receiving the EMR report, the network can quickly trigger a DC / CA setup using the correct prepared cells and send release messages to other candidates not selected by the network for DC / CA setup.

[0072] As a further option, the UE may indicate to the network that the conditions are met in other ways within the connection establishment procedure, for example, by selecting a dedicated RACH opportunity and / or by explicit indication in an RRC setup request following an RA procedure (for a transition from RRC idle mode) or an RRC restart request following an RA procedure (for a transition from RRC inactive mode). In this case, the network may or may not provide the UE with a set of RA preambles. In some exemplary embodiments, if the UE receives a set of preambles, the UE may indicate that the conditions are met by using the preambles of the set of preambles, by selecting a dedicated RACH opportunity, or by explicit indication in an RRC setup request or RRC restart request. In some exemplary embodiments, the UE indicates that the conditions are met by using the preambles of the set of preambles, by selecting a dedicated RACH opportunity, and by explicit indication in an RRC setup request or RRC restart request.

[0073] In some exemplary embodiments, the indications provided in the connection establishment procedure (e.g., preamble, RACH opportunity, and / or explicit indications) may indicate not only that one of the measured cells of the EMR measurement meets the criteria, but also which of the measured cells meet the criteria. In some exemplary embodiments, the gNB requests an EMR measurement report from the UE and evaluates it to determine which of the measured cells meets the criteria (i.e., which is the appropriate cell).

[0074] The advantage of these exemplary embodiments is that they reduce the delay of the SN additional setup (DC / CA preparation phase) and allow for faster DC / CA establishment without waiting for the full EMR report and additional UE reconfiguration delays.

[0075] Figure 4 shows a message sequence chart according to several exemplary embodiments of the present invention. The message sequence chart is for the transition from idle mode to connected mode. Actions not described (or not described in detail) correspond to actions described with respect to Figure 2. The procedure in Figure 4 uses dedicated preamble options. The corresponding procedure applies to dedicated RACH opportunities and explicit indication options. The actions in Figure 4 are substantially as follows: Action 1: The gNB configures the UE with a set of preambles to indicate when certain conditions are met during the EMR measurement. This can also be described as the "type of eEMR". The conditions may be, for example: ○ Find cells with RSRP (Signal Strength) or RSRQ (Signal Quality) values ​​that exceed a certain threshold. ◆The list of PSCell / SCells whose signals are checked against a threshold can be shown by MN. ○The previous serving SN cell (before transitioning to idle state) is known, and the received signal is of good quality (in the case of low-mobility UE). If necessary, the UE may provide the gNB with one of the following pieces of information instead of, or in addition to, an indication that the conditions are met: ○ The EMR measurement is expired or invalid. ○EMR measurement is in progress. ○Verification of EMR measurement is currently underway. If the network (gNB) knows that an EMR measurement has expired or is invalid, the network can quickly configure the UE with an improved / enhanced measurement. If an EMR measurement is in progress (or has not yet been validated), the network may decide not to configure the UE with additional measurements that may further delay the EMR measurement. The mapping of preambles (or RACH opportunities) to PSCell or SCell can be shown to the UE via broadcast signaling or UE-specific signaling. ◆In the case of UE-specific signaling, the mapping between preambles or RACH opportunities and PSCells or SCells can be shared among RAN nodes, allowing RAN nodes to indicate mapping information for neighboring RAN nodes while releasing a UE. Therefore, a UE will know which preamble or RACH opportunity to select if it is roaming towards these RAN nodes. ◆This information can be accompanied by a list of cells where the information is valid, and the UE can disable this feature if it is camped on to a cell where this information is not signaling. Action 2: UE transitions in idle mode. Action 3: The UE performs an EMR measurement and checks whether the conditions for the EMR measurement are met at least one of the candidate nodes. Action 4: When performing an RA, the UE uses a predefined (configured) RA preamble if the conditions are met. Actions 5-12 correspond to the same actions in Figure 2. Actions 13-15: Based on information about the camped-on Pcells (optional) (and optionally, based on the SSB beam used for RA transmission) and the EMR configuration, the MN estimates potential PScells and / or Scells and initiates DC / CA preparation by communicating with these potential PScells and / or Scells through SN additional requests and responses. Action 18: The MN provides the UE with candidate SN configurations and configures the UE to apply only the configurations that match the conditions in the UE EMR measurement. Action 19: The UE applies an SN configuration that matches the conditions in the EMR measurement. ○In one option (or alternative), MN provides UE with an SN configuration corresponding to the appropriate PSCell / SCell after receiving the EMR report in Action 23. In this specification, the appropriate PSCell / SCell may correspond to the one with the strongest reported measurement in the EMR report. Actions 20-23 correspond to the same actions in Figure 2. Actions 24-25: Based on the detailed EMR report, the MN sends a notification of SN reconstruction completion to the appropriate (selected) SN and a notification of SN release to other candidate SNs. Action 26: The UE executes an RA towards the appropriate (selected) SN.

[0076] The advantages of some exemplary embodiments are that the UE can connect to the SN more quickly based on EMR measurements during the legacy procedure, and the MN does not need to wait for the EMR report (step 23) to identify the SN and then configure the SN. The SN configuration then needs to be sent to the UE, which takes some time to apply the SN configuration. The UE then further sends the SN configuration completion to the target SN, after which the target SN can begin using DCCA.

[0077] Figure 5 shows a message sequence chart according to some exemplary embodiments of the present invention. The message sequence chart is for the transition from RRC inactive mode to connected mode. Actions not described (or not described in detail) correspond to the actions described with respect to Figure 3.

[0078] The procedure in Figure 5 uses a dedicated preamble option. The corresponding procedure applies to dedicated RACH opportunities and explicit indication options. The procedure in Figure 5 includes the following actions: Action 1: The gNB configures the UE with a set of preambles to indicate when certain conditions are met during the EMR measurement. This can also be described as the "type of eEMR". The mapping conditions and indications can be the same as those described with respect to Figure 4. Action 2: The UE transitions in RRC inactive mode. Action 3: The UE performs an EMR measurement and checks whether the conditions for the EMR measurement are met at least one of the candidate nodes. Action 4: When performing an RA, the UE uses a predefined (configured) RA preamble if the conditions are met. Actions 5-8 correspond to the same actions in Figure 3. Actions 9-11: Based on information about camped-on Pcells (optional) (and optionally, based on the SSB beam used for RA transmission) and EMR configuration, the MN estimates potential PScells and / or Scells and initiates DC / CA preparation by communicating with these potential PScells and / or Scells through SN additional requests and responses. Action 12: The gNB requests an EMR measurement in the RRC setup response. The RRC setup response may include multiple SN configurations, one for each candidate SN. Action 13: The UE applies an SN configuration that matches the conditions in the EMR measurement. ○In one option (or alternative), MN provides UE with an SN configuration corresponding to the appropriate PSCell / SCell after receiving the EMR report in Action 23. In this specification, the appropriate PSCell / SCell may correspond to the one with the strongest reported measurement in the EMR report. Action 14: Using the RRC completion message, the UE provides the EMR measurement report to the gNB. Actions 15-16: Based on the detailed EMR report, the MN sends a notification of SN reconstruction completion to the appropriate (selected) SN and a notification of SN release to other candidate SNs. Actions 17-20 correspond to conventional techniques for adding selected candidates as SCell or PSCell.

[0079] As described above in this specification, some exemplary embodiments of the present invention provide one or more of the following options. Each option in each category can be combined with any option from any of the other categories. The categories are as follows: • Options to indicate that one or more conditions are met by at least one of the EMR measurements: - Preamble - RACH opportunity - Explicit indication in RRC setup requests or RRC restart requests. Options for gNB to determine the appropriate cell - An indication from the UE that the condition is met by at least one EMR measurement may include an indication of a cell whose EMR measurement satisfies the condition; i.e., gNB can determine the appropriate cell from the indication; - Evaluate the EMR measurement report. Options for providing conditions to the UE: - The conditions are predefined in UE (for example, according to some 3GPP specification). - gNB provides conditions to the UE in the RRC connection state.

[0080] In some exemplary embodiments, two or more options from a single category can be combined. In such cases, depending on the practice, one option may take precedence over another, or both options may have to be satisfied.

[0081] The gNB can select all cells constituting the EMR measurement in the UE as candidate cells for Scell ​​or PSCell, and configure them according to the SgNB additional request. In some exemplary embodiments, the number of candidate cells can also be constrained based on other measurements such as AoA.

[0082] If the indication from the UE includes indications for suitable candidate cells, the gNB can adopt this selection. Alternatively, or if the indication from the UE does not include indications for suitable candidate cells, the gNB can select suitable candidate cells based on the EMR measurement report from the UE. Even in this case, configuration is faster because the suitable cells are pre-configured as Scell ​​or PScell.

[0083] You can add one or more cells as Scell ​​or PScell.

[0084] Figure 6 shows an apparatus according to an exemplary embodiment of the present invention. The apparatus may be a base station (e.g., eNB or gNB) or an element thereof. Figure 7 shows a method according to an exemplary embodiment of the present invention. The apparatus according to Figure 6 can, but is not limited to, the method of Figure 7. The method of Figure 7 can, but is not limited to, the apparatus of Figure 6.

[0085] The device comprises monitoring means 110, requesting means 120, determining means 130, providing means 140, and notifying means 150. The monitoring means 110, requesting means 120, determining means 130, providing means 140, and notifying means 150 can be monitoring means, requesting means, determining means, providing means, and notifying means, respectively. The monitoring means 110, requesting means 120, determining means 130, providing means 140, and notifying means 150 can be monitoring device, requesting device, determining device, providing device, and notifying device, respectively. The monitoring means 110, requesting means 120, determining means 130, providing means 140, and notifying means 150 can be monitoring processor, requesting processor, determining processor, providing processor, and notifying processor, respectively.

[0086] The monitoring means 110 monitors whether the base station receives an indication from the terminal (S110). The indication is received in the connection establishment procedure. The connection establishment procedure is for connecting the terminal to the base station in a connected state. The connection establishment procedure includes at least one of the following: a random access procedure for the terminal, or a terminal connection setup request following the random access procedure for the terminal, or a terminal connection resumption request following the random access procedure for the terminal. The indication shows that a condition has been met by a performance measurement of at least one of one or more candidate cells performed while the terminal is not in a connected state (e.g., in an idle or inactive state). The performance measurement may include an EMR measurement. The connected state may be an RRC connected state.

[0087] If an indication is received from the terminal (S110=yes), the first requesting means 120, the determining means 130, the providing means 140, the second requesting means 150, and the notifying means 160 perform the following actions: The first requesting means 120 requests that each of one or more candidate cells be prepared as a secondary cell for terminal carrier aggregation or dual connectivity (S120). The determining means 130 determines the appropriate cell from one or more candidate cells (S130). The performance measurement of the appropriate cell satisfies the conditions.

[0088] S120 and S130 can be executed in the order S120-S130 or S130-S120. They can be executed entirely or partially in parallel.

[0089] The providing means 140 provides the terminal with a configuration that includes a cell suitable as a secondary cell. The notifying means 150 notifies the appropriate node that the terminal is configured with a cell suitable as a secondary cell (S150).

[0090] Figure 8 shows an apparatus according to an exemplary embodiment of the present invention. The apparatus can be a terminal (e.g., UE) or an element thereof. Figure 9 shows a method according to an exemplary embodiment of the present invention. The apparatus according to Figure 8 can, but is not limited to, the method of Figure 9. The method of Figure 9 can, but is not limited to, the apparatus of Figure 8.

[0091] The device comprises monitoring means 210, checking means 220, supervising means 230, and providing means 240. The monitoring means 210, checking means 220, supervising means 230, and providing means 240 can be monitoring means, checking means, supervising means, and providing means, respectively. The monitoring means 210, checking means 220, supervising means 230, and providing means 240 can be monitoring device, checking device, supervising device, and providing device, respectively. The monitoring means 210, checking means 220, supervising means 230, and providing means 240 can be monitoring processor, checking processor, supervising processor, and providing processor, respectively.

[0092] The monitoring means 210 monitors whether the terminal has exited the RRC connection state and performs performance measurements on one or more candidate cells while the terminal is not in a connection state (e.g., while in an idle or inactive state) (S210). Performance measurements may include EMR measurements. The connection state can be the RRC connection state.

[0093] When the terminal leaves the RRC connection state and performance measurement is performed (S210=yes), the checking means 220, the supervising means 230, and the providing means 240 perform the following actions: The checking means 220 checks whether at least one of the performance measurements satisfies the conditions (S220). The supervising means 230 supervises whether the terminal intends to connect with the base station in a connected state by the connection establishment means (S230). The connection establishment procedure includes at least one of the following: a random access procedure for the terminal, or a connection setup request for the terminal, or a connection resumption request for the terminal.

[0094] S220 and S230 can be executed in the order S220-S230 or S230-S220. They can be executed entirely or partially in parallel.

[0095] If at least one of the performance measurements satisfies the condition (S220=yes) and the terminal intends to connect to the base station by a connection establishment procedure in a connected state (S230=yes), the providing means 240 provides an indication to the base station (S240). The providing means 240 provides an indication within the connection establishment means. The indication indicates that at least one of the performance measurements satisfies the condition. The indication can be explicit or implicit by using a dedicated preamble or RACH opportunity in the random access procedure.

[0096] Figure 10 shows an apparatus according to an exemplary embodiment of the present invention. The apparatus comprises at least one processor 810 and at least one memory 820 that stores instructions causing the apparatus to perform at least one of the methods shown in the following figures and related description: Figure 7 or Figure 9, when executed by the at least one processor 810.

[0097] Some exemplary embodiments of the present invention are useful for mm wave frequencies (FR2). However, the present invention is not limited to FR2 and can be applied to any frequency range.

[0098] Unless otherwise specified, the terms "node" and "cell" can be considered synonymous; that is, "node" refers to the corresponding "cell."

[0099] Several exemplary embodiments relating to 5G networks are described. However, the present invention is not limited to 5G. The present invention can also be used in other communication networks, such as past or future generations of 3GGP networks, including 4G, 6G, or 7G.

[0100] Information can be sent from one entity to another entity in one or more messages. Each of these messages may contain further (different) information.

[0101] The names of network elements, network functions, protocols, and methods are based on the current standard. In other versions or other technologies, the names of these network elements and / or network functions and / or protocols and / or methods may differ, provided they provide the corresponding functionality. The same applies to terminals.

[0102] Unless otherwise stated or made clear from the context, the difference between two entities means that they perform different functions. This does not necessarily mean that they are based on different hardware; that is, each of the entities described herein may be based on different hardware, or some or all of the entities may be based on the same hardware. This does not necessarily mean that they are based on different software; that is, each of the entities described herein may be based on different software, or some or all of the entities may be based on the same software. Each of the entities described herein may be deployed in the cloud.

[0103] Therefore, as described above, it is clear that exemplary embodiments of the present invention provide, for example, a base station (eNB or gNB) or its components, an apparatus that embodies the same, a method for controlling and / or operating the same, a computer program for controlling and / or operating the same, and a medium for holding such a computer program and forming a computer program product. Therefore, as described above, it is clear that exemplary embodiments of the present invention provide, for example, a terminal (e.g., UE, MTC device, etc.) or its components, an apparatus that embodies the same, a method for controlling and / or operating the same, a computer program for controlling and / or operating the same, and a medium for holding such a computer program and forming a computer program product.

[0104] Implementation of any of the blocks, apparatus, systems, techniques, or methods described above includes, but is not limited to, hardware, software, firmware, dedicated circuitry or logic, general-purpose hardware or controllers, or other computing devices, or combinations thereof. Each of the entities described herein may be embodied in the cloud.

[0105] It is understood that what is described above is considered to be a preferred exemplary embodiment of the present invention at present. However, it should be understood that the description of the preferred exemplary embodiment is given merely as an example, and various modifications can be made without departing from the scope of the invention as defined by the appended claims.

[0106] The terms “first X” and “second X” include the option that “first X” is the same as “second X” and “first X” is different from “second X,” unless otherwise indicated. When used herein, “at least one of the following: <list of two or more elements>” and “at least one of the <list of two or more elements>,” and similar phrases in which lists of two or more elements are joined by “and” or “or,” mean at least any one of the elements, or at least any two or more of the elements, or at least all of the elements.

Claims

1. It is a device, The device comprises one or more processors and a memory for storing instructions, and when an instruction is executed by the one or more processors, the device The base station monitors, in the terminal connection establishment procedure for establishing a connection between the terminal and the base station in a connected state, whether it receives an indication from the terminal that a condition has been met by a performance measurement of at least one of one or more candidate cells performed while the terminal was not in the connected state, wherein the connection establishment procedure includes at least one of the terminal's random access procedure, the terminal's connection setup request, or the terminal's connection reactivation request. When the aforementioned indication is received from the terminal, - Requesting each of the one or more candidate cells to be prepared as a secondary cell for the terminal's carrier aggregation or dual connectivity, - Determining an appropriate cell from among the one or more candidate cells, wherein the performance measurement of the appropriate cell satisfies the above conditions. - To provide the terminal with a configuration that includes the appropriate cell as a secondary cell, - Notifying the appropriate cell that the terminal is configured using the appropriate cell as the secondary cell, A device that performs an action.

2. When the instruction is executed by the one or more processors, the device will: To provide the aforementioned terminal with a set of one or more preambles, Monitoring whether the terminal uses one of the preambles from the set of one or more preambles in the random access procedure, thereby monitoring whether an indication is received from the terminal during the terminal's connection establishment procedure that the condition is met by the performance measurement of at least one candidate cell, The apparatus according to claim 1, which further performs the following.

3. When the instruction is executed by the one or more processors, the device will: To provide the aforementioned terminal with an indication of a dedicated random access channel opportunity, The monitoring includes monitoring whether the terminal selects the dedicated random access channel opportunity in the random access procedure, and whether an indication is received from the terminal during the connection establishment procedure that the condition is met by the performance measurement of at least one candidate cell, The apparatus according to claim 1 or 2, which further enables the following:

4. When the instruction is executed by the one or more processors, the device will: The apparatus according to any one of claims 1 to 3, further comprising monitoring whether the terminal provides an explicit indication in the connection setup request or the connection resume request, thereby causing the terminal to further monitor whether an indication is received from the terminal that the condition is met by the performance measurement of at least one candidate cell within the connection establishment procedure of the terminal.

5. When the instruction is executed by the one or more processors, the device will: To provide the terminal with a measurement configuration for performance measurement, or To provide the aforementioned conditions to the aforementioned terminal, The apparatus according to any one of claims 1 to 4, further comprising performing at least one of the above.

6. When the instruction is executed by one or more processors, if there are two or more candidate cells, the device will: The apparatus according to any one of claims 1 to 5, further comprising the action of freeing up candidate cells different from the appropriate cells so that they do not become secondary cells for the carrier aggregation or dual connectivity of the terminal.

7. When the instruction is executed by one or more processors, if there are two or more candidate cells, the device will: To provide the terminal with the configuration including the appropriate cell as the secondary cell by providing the terminal with the respective configuration for each of the candidate cells, wherein each of the configurations includes each of the candidate cells as the secondary cell. The terminal is instructed to select the appropriate cell from the candidate cells and to apply only the configuration of the appropriate cell. The apparatus according to any one of claims 1 to 6, which causes to perform the following.

8. When the instruction is executed by the one or more processors, the device will: The apparatus according to claim 7, wherein the terminal is made to provide the terminal with the respective configurations for each of the candidate cells prior to the request for the performance measurement report.

9. When the instruction is executed by one or more processors, if there are two or more candidate cells, the device will: The apparatus according to any one of claims 1 to 6, wherein after the determination of the appropriate cell, the device causes the terminal to perform the act of providing the terminal with the configuration including the appropriate cell as a secondary cell.

10. The apparatus according to any one of claims 1 to 9, wherein the indication includes the indication of the appropriate cell.

11. When the instruction is executed by the one or more processors, the device will: Requesting the performance measurement report from the aforementioned terminal, By analyzing the report of the performance measurement, the appropriate cell among the one or more candidate cells is determined. The apparatus according to any one of claims 1 to 10, which further enables the following:

12. When the instruction is executed by the one or more processors, the device will: The apparatus according to any one of claims 1 to 11, further comprising causing the terminal to estimate a candidate cell from a set of potential candidate cells based on information about the primary cell on which it is camped.

13. The apparatus according to any one of claims 1 to 12, wherein the performance measurement includes early measurement report measurement.

14. It is a device, The device comprises one or more processors and a memory for storing instructions, and when an instruction is executed by the one or more processors, the device The terminal leaves the connection state and monitors whether or not to perform performance measurements on one or more candidate cells while the terminal is not in the said connection state. If the terminal leaves the connection state and the performance measurement is performed while the terminal is not in the connection state, - Check whether at least one of the aforementioned performance measurements satisfies the conditions, - Supervising whether the terminal intends to connect with the base station in the connection state by means of a connection establishment procedure, wherein the connection establishment procedure includes at least one of the following: a random access procedure for the terminal, a connection setup request for the terminal, or a connection resumption request for the terminal. - If at least one of the performance measurements satisfies the conditions, and the terminal intends to connect with the base station in the connection state by the connection establishment procedure, the terminal shall provide an indication to the base station within the connection establishment procedure, wherein the indication indicates that at least one of the performance measurements satisfies the conditions. A device that performs an action.

15. When the instruction is executed by the one or more processors, the device will: The apparatus according to claim 14, wherein the provision is performed by providing an explicit indication in the connection setup request or the connection resumption request.

16. When the instruction is executed by the one or more processors, the device will: The terminal is made to monitor whether it receives one or more preambles, and when the instruction is executed by the one or more processors, the device is made to The apparatus according to claim 14 or 15, further comprising using one of the preambles of the set of one or more preambles in the random access procedure to provide the indication.

17. When the instruction is executed by the one or more processors, the device will: The terminal further monitors whether it receives an indication of a random access channel opportunity, and when the instruction is executed by one or more processors, the device, The apparatus according to any one of claims 14 to 16, which causes the apparatus to perform the provision of the indication by selecting the random access channel opportunity in the random access procedure.

18. When the instruction is executed by the one or more processors, the device will: To receive the measurement configuration for the performance measurement, or To receive the aforementioned conditions, The apparatus according to any one of claims 14 to 17, further comprising performing at least one of the above.

19. When the instruction is executed by the one or more processors, the device will: Monitoring whether the terminal receives a configuration from the base station, wherein the configuration includes one of the candidate cells as the secondary cell of the terminal. When the terminal receives the configuration, the configuration is applied to the terminal. The apparatus according to any one of claims 14 to 18, which further enables the following:

20. When the instruction is executed by the one or more processors, if the measurement configuration includes performance measurement of two or more candidate cells, the device shall: The terminal monitors whether it receives from the base station, for each of the candidate cells, a command to select only one of the components and the configuration, wherein each of the configurations includes the respective candidate cell as the secondary cell of the terminal. When the terminal receives the configuration and instructions of the candidate cells, it selects one of the candidate cells based on the results of the performance measurement of the candidate cells, Applying only the above configuration of the selected candidate cell to the terminal, The apparatus according to claim 19, which further performs the following.

21. The apparatus according to any one of claims 14 to 20, wherein the indication further indicates the candidate cell that satisfies the performance measurement conditions.

22. The apparatus according to any one of claims 14 to 21, wherein the performance measurement includes early measurement report measurement.

23. It is a method, The base station monitors, in the terminal connection establishment procedure for establishing a connection between the terminal and the base station in a connected state, whether it receives an indication from the terminal that a condition has been met by a performance measurement of at least one of one or more candidate cells performed while the terminal was not in the connected state, wherein the connection establishment procedure includes at least one of the terminal's random access procedure, the terminal's connection setup request, or the terminal's connection reactivation request. When the aforementioned indication is received from the terminal, - Requesting each of the one or more candidate cells to be prepared as a secondary cell for the terminal's carrier aggregation or dual connectivity, - Determining an appropriate cell from among the one or more candidate cells, wherein the performance measurement of the appropriate cell satisfies the above conditions. - To provide the terminal with a configuration that includes the appropriate cell as a secondary cell, - Notifying the appropriate cell that the terminal is configured using the appropriate cell as the secondary cell, Methods that include...

24. The aforementioned method, The terminal is further provided with a set of one or more preambles. The method of claim 23, wherein monitoring in the terminal's connection establishment procedure whether an indication is received from the terminal that the condition is met by the performance measurement of at least one candidate cell includes monitoring whether the terminal uses one of the preambles of the set of one or more preambles in the random access procedure.

25. The aforementioned method, The further includes providing the terminal with an indication of a dedicated random access channel opportunity, The method according to claim 23 or 24, wherein monitoring in the terminal's connection establishment procedure whether an indication is received from the terminal that the condition is met by the performance measurement of at least one candidate cell includes monitoring whether the terminal selects the dedicated random access channel opportunity in the random access procedure.

26. The method according to any one of claims 23 to 25, wherein monitoring whether an indication is received from the terminal that the condition is met by the performance measurement of at least one candidate cell within the connection establishment procedure of the terminal includes monitoring whether the terminal provides an explicit indication in the connection setup request or the connection resume request.

27. The aforementioned method, To provide the terminal with a measurement configuration for performance measurement, or To provide the aforementioned conditions to the aforementioned terminal, The method according to any one of claims 23 to 26, further comprising:

28. The aforementioned method, The method according to any one of claims 23 to 27, further comprising freeing up the candidate cell, which is different from the appropriate cell, so that it does not become a secondary cell in the carrier aggregation or dual connectivity of the terminal.

29. Providing the terminal with the configuration including the appropriate cell as the secondary cell includes providing the terminal with the respective configuration for each of the candidate cells, each of which includes the respective candidate cell as the secondary cell, and the method is The method according to any one of claims 23 to 28, further comprising instructing the terminal to select the appropriate cell from the candidate cells and to apply only the configuration of the appropriate cell.

30. The method according to claim 29, wherein the terminal is provided with the respective configuration for each of the candidate cells prior to requesting the report of the performance measurement to the terminal.

31. The method according to any one of claims 23 to 28, wherein providing the terminal with the configuration including the appropriate cell as the secondary cell includes providing the terminal with only the configuration including the appropriate cell as the secondary cell after the determination of the appropriate cell.

32. The method according to any one of claims 23 to 31, wherein the indication includes the indication of the appropriate cell.

33. The aforementioned method, The further includes requesting the terminal to submit the performance measurement report, The method according to any one of claims 23 to 32, wherein determining the appropriate cell from the one or more candidate cells is performed by analyzing the report of the performance measurement.

34. The aforementioned method, The method according to any one of claims 23 to 33, further comprising estimating a candidate cell from a set of potential candidate cells based on information about the primary cell on which the terminal is camped.

35. The method according to any one of claims 23 to 34, wherein the performance measurement includes an early measurement report measurement.

36. It is a method, The system includes one or more processors and a memory for storing instructions, and when the instructions are executed by the one or more processors, the method includes: The terminal leaves the connection state and monitors whether or not to perform performance measurements on one or more candidate cells while the terminal is not in the said connection state. If the terminal leaves the connection state and the performance measurement is performed while the terminal is not in the connection state, - Check whether at least one of the aforementioned performance measurements satisfies the conditions, - Supervising whether the terminal intends to connect with the base station in the connection state by means of a connection establishment procedure, wherein the connection establishment procedure includes at least one of the following: a random access procedure for the terminal, a connection setup request for the terminal, or a connection resumption request for the terminal. - If at least one of the performance measurements satisfies the conditions, and the terminal intends to connect with the base station in the connection state by the connection establishment procedure, the terminal shall provide an indication to the base station within the connection establishment procedure, wherein the indication indicates that at least one of the performance measurements satisfies the conditions. A method to make it happen.

37. The method according to claim 36, wherein providing the above includes providing an explicit indication in the connection setup request or the connection resume request.

38. The aforementioned method, The terminal further includes monitoring whether it receives one or more sets of preambles, The method according to claim 36 or 37, wherein providing the indication includes using one of the preambles of the set of one or more preambles in the random access procedure.

39. The aforementioned method, The further includes monitoring whether the terminal receives an indication of a random access channel opportunity, The method according to any one of claims 36 to 38, wherein providing the indication includes selecting the random access channel opportunity in the random access procedure.

40. To receive the measurement configuration for the performance measurement, or To receive the aforementioned conditions, The method according to any one of claims 36 to 39, further comprising at least one of the above.

41. The aforementioned method, Monitoring whether the terminal receives a configuration from the base station, wherein the configuration includes one of the candidate cells as the secondary cell of the terminal. When the terminal receives the configuration, the configuration is applied to the terminal. The method according to any one of claims 36 to 40, further comprising:

42. If the measurement configuration includes performance measurement of two or more candidate cells, The terminal monitors whether it receives from the base station, for each of the candidate cells, a command to select only one of the components and the configuration, wherein each of the configurations includes the respective candidate cell as the secondary cell of the terminal. When the terminal receives the configuration and instructions of the candidate cells, it selects one of the candidate cells based on the results of the performance measurement of the candidate cells, Applying only the above configuration of the selected candidate cell to the terminal, The method according to claim 41, further comprising:

43. The method according to any one of claims 36 to 42, wherein the indication further indicates the candidate cell that satisfies the conditions for the performance measurement.

44. The method according to any one of claims 36 to 43, wherein the performance measurement includes an early measurement report measurement.

45. A computer program product comprising a set of instructions configured to cause a device to perform the method described in any one of claims 23 to 44 when executed on the device.

46. The computer program product according to claim 45, which is embodied as a computer-readable medium or is directly loadable onto a computer.

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