Terminal and wireless communication method

Abstract

This terminal receives a reconfiguration message that is of a specific layer and that contains a reconfiguration parameter for a secondary cell group that was deactivated; and on the basis of the reconfiguration parameter contained in the reconfiguration message that was received, the terminal executes reconfiguration of a specific layer related to the secondary cell group.

Description

[Technical field]

[0001] The present disclosure relates to a terminal and a wireless communication method that support dual connectivity. [Background technology]

[0002] The 3rd Generation Partnership Project (3GPP) has developed specifications for the 5th generation mobile communication system (5G, also known as New Radio (NR) or Next Generation (NG)), and is also developing specifications for the next generation, known as Beyond 5G, 5G Evolution, or 6G.

[0003] For example, 3GPP Release-17 is considering an extension of Multi-RAT Dual Connectivity (MR-DC) (Non-Patent Document 1), specifically, to support efficient activation / deactivation mechanisms for secondary cell groups (SCGs) and secondary cells (SCells).

[0004] In addition, with regard to supporting such an SCG activation / deactivation mechanism, it has been agreed to consider the processing of Radio Resource Control layer (RRC) messages (specifically, RRC Reconfiguration) (Non-Patent Document 2). [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] "Revised WID on Further Multi-RAT Dual-Connectivity enhancements", RP-201040, 3GPP TSG RAN Meeting #88e, 3GPP, June 2020 [Non-Patent Document 2] "Report of 3GPP TSG RAN2#112-e meeting, Online", R2-2100001, 3GPP TSG-RAN WG2 meeting #113-e, 3GPP, December 2020 Summary of the Invention

[0006] In the existing specifications for RRC (specific layer), parameters that are required for a normal activated SCG but are not required for adding or changing a deactivated SCG (deactivated SCG) are specified, and it was found that there is a problem that the specifications cannot be applied as is to a deactivated SCG. For this reason, if the specifications are applied as is to a deactivated SCG, the terminal (User Equipment, UE) will not operate normally.

[0007] Therefore, the following disclosure has been made in consideration of such circumstances, and aims to provide a terminal and a wireless communication method that can achieve normal operation in a specific layer even in the case of a deactivated SCG.

[0008] One aspect of the present disclosure is a terminal (UE200) comprising a receiver (RRC processing unit 220) that receives a reconfiguration message of a specific layer including reconfiguration parameters of a deactivated secondary cell group, and a control unit (control unit 240) that performs reconfiguration of the specific layer for the secondary cell group based on the reconfiguration parameters included in the received reconfiguration message.

[0009] One aspect of the present disclosure is a terminal (UE 200) having a receiver (RRC processing unit 220) that receives a reconfiguration message of a specific layer, and a control unit (control unit 240) that avoids the use of reconfiguration parameters included in the reconfiguration message when a secondary cell group is inactive.

[0010] One aspect of the present disclosure is a wireless communication method including a step of a terminal receiving a reconfiguration message of a specific layer including reconfiguration parameters of a deactivated secondary cell group, and a step of the terminal performing a reconfiguration of the specific layer for the secondary cell group based on the reconfiguration parameters included in the received reconfiguration message.

[0011] One aspect of the present disclosure is a wireless communication method including a step of a terminal receiving a reconfiguration message of a specific layer, and a step of the terminal avoiding use of a reconfiguration parameter included in the reconfiguration message when a secondary cell group is inactive. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a diagram showing an overall schematic configuration of a wireless communication system 10. As shown in FIG. [Diagram 2] FIG. 2 is a functional block diagram of the eNB100A. [Diagram 3] FIG. 3 is a functional block diagram of UE 200. [Figure 4] FIG. 4 is a diagram showing an example of a communication sequence regarding a conventional PSCell addition. [Diagram 5] FIG. 5 is a diagram illustrating an example of a communication sequence regarding addition of a PSCell according to the first operation example. [Figure 6] FIG. 6 is a diagram showing an example of the configuration of CellGroupConfig including ReconfigurationWithdeactivatedSCG. [Figure 7] FIG. 7 is a diagram showing an operation procedure of UE 200 using ReconfigurationWithdeactivatedSCG. [Figure 8] FIG. 8 is a diagram showing an operation procedure of UE 200 using ReconfigurationWithdeactivatedSCG. [Figure 9] FIG. 9 is a diagram illustrating an example of the hardware configuration of eNB100A, gNB100B, and UE200. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, an embodiment will be described with reference to the drawings. Note that the same or similar reference numerals are used to designate the same functions or configurations, and the description thereof will be omitted as appropriate.

[0014] (1) Overall configuration of wireless communication system 1 is a schematic diagram of an overall configuration of a wireless communication system 10 according to the present embodiment. The wireless communication system 10 is a wireless communication system conforming to Long Term Evolution (LTE) and 5G New Radio (NR). Note that LTE may be called 4G, and NR may be called 5G. The wireless communication system 10 may also be a wireless communication system conforming to a method called Beyond 5G, 5G Evolution, or 6G.

[0015] LTE and NR may be interpreted as radio access technologies (RATs), and in this embodiment, LTE may be referred to as the first radio access technology, and NR may be referred to as the second radio access technology.

[0016] The wireless communication system 10 includes an Evolved Universal Terrestrial Radio Access Network 20 (hereinafter, E-UTRAN 20) and a Next Generation-Radio Access Network 30 (hereinafter, NG RAN 30). The wireless communication system 10 also includes a terminal 200 (hereinafter, UE 200, User Equipment).

[0017] The E-UTRAN 20 includes an eNB 100A that is a radio base station conforming to LTE. The NG RAN 30 includes a gNB 100B that is a radio base station conforming to 5G (NR). In addition, a User Plane Function 40 (hereinafter, UPF 40) that is included in the 5G system architecture and provides a user plane function is connected to the NG RAN 30. Note that the E-UTRAN 20 and the NG RAN 30 (which may be the eNB 100A or the gNB 100B) may simply be referred to as a network.

[0018] The eNB100A, gNB100B and UE200 are capable of supporting carrier aggregation (CA) using multiple component carriers (CCs), and dual connectivity for simultaneously transmitting component carriers between multiple NG-RAN nodes and the UE.

[0019] The eNB100A, the gNB100B and the UE200 perform wireless communication via a radio bearer, specifically, a Signalling Radio Bearer (SRB) or a Data Radio Bearer (DRB).

[0020] In this embodiment, the eNB100A may configure a master node (MN) and the gNB100B may configure a secondary node (SN) in a Multi-Radio Dual Connectivity (MR-DC), specifically, an E-UTRA-NR Dual Connectivity (EN-DC) may be implemented, or the gNB100B may configure an MN and the eNB100A may configure an SN in an NR-E-UTRA Dual Connectivity (NE-DC). Alternatively, an NR-NR Dual Connectivity (NR-DC) may be implemented in which the gNB configures an MN and an SN.

[0021] In this way, UE200 supports dual connectivity connecting to eNB100A and gNB100B.

[0022] The eNB 100A is included in a master cell group (MCG), and the gNB 100B is included in a secondary cell group (SCG). In other words, the gNB 100B is an SN included in the SCG.

[0023] The eNB100A and the gNB100B may be referred to as radio base stations or network devices.

[0024] Furthermore, the wireless communication system 10 may support addition or change of a Primary SCell (PSCell). Note that the PSCell addition / change may include conditional addition or change of a PSCell.

[0025] A PSCell is a type of secondary cell. A PSCell means a Primary SCell (secondary cell), and may be interpreted as corresponding to any one of a plurality of SCells.

[0026] In addition, the secondary cell may be read as a secondary node (SN) or a secondary cell group (SCG).

[0027] Furthermore, a conditional inter-SN PSCell change procedure may be supported in the wireless communication system 10. Specifically, an MN-initiated conditional inter-SN PSCell change and / or an SN-initiated conditional inter-SN PSCell change may be supported.

[0028] (2) Functional block configuration of wireless communication system Next, a description will be given of a functional block configuration of the wireless communication system 10. Specifically, a description will be given of a functional block configuration of the eNB 100A and the UE 200.

[0029] (2.1) eNB100A Fig. 2 is a functional block diagram of the eNB 100A. As shown in Fig. 2, the eNB 100A includes a radio communication unit 110, an RRC processing unit 120, a DC processing unit 130, and a control unit 140. Note that the gNB 100B may also have similar functions to the eNB 100A, except that the gNB 100B supports NR.

[0030] The wireless communication unit 110 transmits a downlink signal (DL signal) conforming to LTE, and also receives an uplink signal (UL signal) conforming to LTE.

[0031] The RRC processing unit 120 executes various processes in a radio resource control layer (RRC). Specifically, the RRC processing unit 120 can transmit an RRC Reconfiguration to the UE 200. In addition, the RRC processing unit 120 can receive an RRC Reconfiguration Complete from the UE 200, which is a response to the RRC Reconfiguration.

[0032] In this embodiment, the eNB 100A supports LTE. In this case, the name of the RRC message may be RRC Connection Reconfiguration or RRC Connection Reconfiguration Complete.

[0033] The DC processing unit 130 executes processing related to dual connectivity, specifically, Multi-RAT Dual Connectivity (MR-DC). In this embodiment, the eNB100A supports LTE and the gNB100B supports NR, so the DC processing unit 130 may execute processing related to E-UTRA-NR Dual Connectivity (EN-DC). Note that, as described above, the type of DC is not limited, and may correspond to, for example, NR-E-UTRA Dual Connectivity (NE-DC) or NR-NR Dual Connectivity (NR-DC).

[0034] The DC processing unit 130 can transmit and receive messages defined in 3GPP TS37.340 and the like, and perform processing related to setting and releasing DC between the eNB100A, the gNB100B, and the UE200.

[0035] The control unit 140 controls each functional block constituting the eNB 100 A. In particular, in this embodiment, the control unit 140 executes control related to addition or change of a secondary cell (which may be a secondary node).

[0036] Specifically, the control unit 140 can execute control related to addition or change of a secondary node (SN) based on a measurement report from the UE 200 or the like.

[0037] Furthermore, the control unit 140 can execute control related to activation / de-activation of a secondary cell group (SCG). Specifically, the control unit 140 may activate (which may be called activation) or deactivate (which may be called deactivation) an SCG. More specifically, the control unit 140 may activate or deactivate one or more SCells (which may include a PSCell, the same applies below) included in the SCG.

[0038] An active SCG (SCell) may be interpreted as a state in which the UE 200 can immediately use the SCG (SCell). An inactive SCG (SCell) may be interpreted as a state in which the UE 200 cannot immediately use the SCG (SCell), but configuration information is held.

[0039] In this embodiment, the channels include a control channel and a data channel. The control channels include a physical downlink control channel (PDCCH), a physical uplink control channel (PUCCH), a physical random access channel (PRACH), and a physical broadcast channel (PBCH).

[0040] The data channels include a Physical Downlink Shared Channel (PDSCH) and a Physical Uplink Shared Channel (PUSCH).

[0041] In addition, the reference signal includes a Demodulation reference signal (DMRS), a Sounding Reference Signal (SRS), a Phase Tracking Reference Signal (PTRS), and a Channel State Information-Reference Signal (CSI-RS), and the signal includes a channel and a reference signal. In addition, the data may mean data transmitted through a data channel.

[0042] (2.2)UE200 3 is a functional block diagram of the UE 200. As shown in FIG. 3, the UE 200 includes a radio communication unit 210, an RRC processing unit 220, a DC processing unit 230, and a control unit 240.

[0043] The wireless communication unit 210 transmits an uplink signal (UL signal) conforming to LTE or NR. The wireless communication unit 210 also receives a downlink signal (DL signal) conforming to LTE. That is, the UE 200 can access the eNB 100A (E-UTRAN 20) and the gNB 100B (NG RAN 30) and can support dual connectivity (specifically, EN-DC).

[0044] The RRC processing unit 220 executes various processes in the radio resource control layer (RRC). Specifically, the RRC processing unit 220 can transmit and receive messages of the radio resource control layer. The radio resource control layer may be expressed as a specific layer.

[0045] The RRC processing unit 220 can receive RRC Reconfiguration from the network, specifically, from the E-UTRAN 20 (or the NG RAN 30). The RRC processing unit 220 can also transmit RRC Reconfiguration Complete, which is a response to the RRC Reconfiguration, to the network. The RRC Reconfiguration may be interpreted as a type of reconfiguration message that reconfigures the RRC.

[0046] The RRC processing unit 220 can receive an RRC reconfiguration message including reconfiguration parameters of the deactivated SCG, specifically, an RRC Reconfiguration. In this embodiment, the RRC processing unit 220 constitutes a receiving unit.

[0047] Specifically, the RRC processing unit 220 can receive RRC Reconfiguration including SCG RRC Reconfiguration from the MN (e.g., eNB100A). The SCG RRC Reconfiguration may include an information element (IE) called ReconfigurationWithdeactivatedSCG (may be a tentative name). The ReconfigurationWithdeactivatedSCG may include reconfiguration parameters (may be fields) such as sPCellConfigCommon, newUE-Indentity, and smtc (SSB based RRM Measurement Timing Configuration window). Details of the reconfiguration parameters will be described later.

[0048] The DC processing unit 230 executes a process related to dual connectivity, specifically, MR-DC. As described above, in this embodiment, the DC processing unit 230 may execute a process related to EN-DC, but may also correspond to NE-DC and / or NR-DC.

[0049] The DC processing unit 230 can access each of the eNB100A and the gNB100B and perform configuration at multiple layers including RRC (such as the medium access control layer (MAC), the radio link control layer (RLC), and the packet data convergence protocol layer (PDCP)).

[0050] The control unit 240 controls each functional block constituting the UE 200. In particular, in this embodiment, the control unit 240 can execute control related to activation / de-activation (active / de-active) of a secondary cell group (SCG).

[0051] Specifically, the control unit 240 may execute RRC reconfiguration for the SCG based on reconfiguration parameters included in the received RRC Reconfiguration (reconfiguration message). More specifically, the control unit 240 may execute control related to activation of a deactivated SCG based on parameters included in ReconfigurationWithdeactivatedSCG.

[0052] For example, the control unit 240 may perform RRC reconfiguration of the deactivated SCG to reactivate the SCG. Also, the control unit 240 may avoid using reconfiguration parameters included in the RRC Reconfiguration when the SCG is inactive (i.e., the deactivated SCG). Note that the reconfiguration parameters included in the RRC Reconfiguration may be interpreted as being for the activated SCG, not for the deactivated SCG as described above.

[0053] Avoiding use may include not using the reconfiguration parameter (for example, a parameter included in reconfigurationWithSync), ceasing to use (suspending), or ignoring the reconfiguration parameter.

[0054] Furthermore, the control unit 240 may determine whether the SCG is in an inactive state. Specifically, the control unit 240 may determine whether the SCG is in an inactive state based on an information element (for example, secondaryCellGroupState (which may be a tentative name)) included in sPcellConfig (see 3GPP TS38.331).

[0055] When the SCG is inactive, the control unit 240 may suspend at least one of the SCG bearer and the SCG transmission. The SCG bearer may be interpreted as a radio bearer set via a SCell included in the SCG. The SCG transmission may be interpreted as transmission and reception of a signal (data) via the radio bearer. In addition, "suspend" may include the meaning of stopping, interrupting, etc.

[0056] On the other hand, when the SCG is in an active state, the control unit 240 may execute at least one of the bearer of the SCG or the transmission in the SCG. Specifically, when a deactivated SCG returns to an active state, the control unit 240 may resume the bearer of the SCG or the transmission in the SCG.

[0057] (3) Operation of wireless communication system Next, a description will be given of the operation of the wireless communication system 10. Specifically, a description will be given of the operation related to activation / de-activation of a secondary cell group (SCG).

[0058] (3.1) Conventional operation examples and issues Fig. 4 shows an example of a conventional communication sequence related to PSCell addition. As shown in Fig. 4, in the conventional communication sequence example, when an MN transmits an RRC Reconfiguration to a UE 200 in a PSCell addition / change, an SCG RRC Reconfiguration is included in the RRC Reconfiguration. The SCG RRC Reconfiguration may include an information element such as reconfigurationWithSync.

[0059] The reconfigurationWithSync includes parameters of T304 and Dedicated RACH resource. The timer T304 is started when an RRC Reconfiguration message including reconfigurationWithSync is received or when a PSCell addition or change is performed, that is, when an RRC Reconfiguration message including reconfigurationWithSync is applied, and may be stopped when random access is successfully completed in a corresponding Special Cell (SpCell).

[0060] However, in the case of addition / change of a deactivated SCG, T304 and Dedicated RACH resource are not required. When the timer T304 expires, it is determined as a Radio Link Failure (RLF), a handover failure, or a synchReconfigFailureSCG (SCG failure), so it is necessary to avoid using this parameter.

[0061] That is, the MN needs to configure resources for the deactivated SCG in the UE 200 by RRC signaling, separately from the activated SCG.

[0062] (3.2) Example of operation An example of operation that can solve the above-mentioned problem and execute addition / change of a normal deactivated SCG will be described below.

[0063] (3.2.1) Example 1 5 shows an example of a communication sequence related to the addition of a PSCell according to operation example 1. Below, differences from the above-mentioned conventional communication sequence example related to the addition of a PSCell (see FIG. 4) will be mainly described.

[0064] As shown in FIG. 5, under RRC Reconfiguration, ReconfigurationWithdeactivatedSCG, which is an IE separate and independent from reconfigurationWithSync, may be provided.

[0065] ReconfigurationWithdeactivatedSCG may include the fields sPCellConfigCommon, newUE-Indentity, and smtc.

[0066] Figure 6 shows an example of the configuration of CellGroupConfig including ReconfigurationWithdeactivatedSCG. ReconfigurationWithdeactivatedSCG (or ReconfigurationWithSCGdeactivated) may be mandatory in an RRC Reconfiguration message regarding addition / change of a PSCell with a deactivated SCG. Otherwise, it may be optional.

[0067] As shown in FIG. 6, ReconfigurationWithdeactivatedSCG may include sPCellConfigCommon, newUE-Indentity, and smtc.

[0068] In addition, ReconfigurationWithdeactivatedSCG may further include a dedicated RACH resource (Contention free RACH resource). By using the dedicated RACH resource after adding / changing the deactivated SCG, it is possible to transition (return) to the active state more quickly.

[0069] sPCellConfigCommon may specify the configuration of the cell (which may be the serving cell) related to the SCG. newUE-Indentity may be any identification information of the UE 200, and may be, for example, a Radio Network Temporary Identifier (RNTI). smtc may indicate the configuration of the synchronization signal block (SSB: SS / PBCH Block) and the measurement timing by the radio resource management (RRM).

[0070] A network (specifically, an MN and / or an SN) may use reconfigurationWithSync when adding / changing an activated SCG, whereas a network may use ReconfigurationWithdeactivatedSCG when adding / changing a deactivated SCG.

[0071] 7 and 8 show an operation procedure of the UE 200 using ReconfigurationWithdeactivatedSCG (ReconfigurationWithSCGdeactivated). Specifically, the operation procedure shown in Fig. 7 may be specified in, for example, Chapter 5 of 3GPP TS38.331.

[0072] As shown in Fig. 7 and Fig. 8, when ReconfigurationWithdeactivatedSCG is included in CellGroupConfig (spCellConfig), UE 200 may perform reconfiguration of the deactivated SCG (see Chapter 5.3.5.5.x in Fig. 8). Note that, when transitioning the SCG from the deactivated state to the activated state, UE 200 may perform a random access procedure (i.e., transmit a RACH) using a dedicated RACH resource (Contention free RACH resource) included in beamFailuerRecoveryConfig.

[0073] Alternatively, by providing a dedicated RACH resource (Contention free RACH resource) under the sPCellConfigDedicated(servingCellConfig) IE included in the SpCellConfig, UE200 may perform a random access procedure (i.e., transmit a RACH) using the dedicated RACH resource when transitioning the SCG from a deactivated state to an activated state.

[0074] (3.2.2) Example 2 In this operation example, the parameters of T304 and Dedicated RACH resource included in reconfigurationWithSync do not need to be used by UE200.

[0075] Specifically, when the state of secondaryCellGroupConfig, sPCellConfig, or mrdc-SecondaryCellGroupConfig included in the received RRC Reconfiguration is deactivated, UE 200 may not use (or may be expressed as ignoring) T304 and the Dedicated RACH resource included in reconfigurationWithSync. Furthermore, UE 200 may not use the Dedicated RACH resource included in reconfigurationWithSync when adding / changing a deactivated SCG, and may use the dedicated RACH resource when transitioning from the deactivated state to the activated state thereafter.

[0076] In this case, the UE 200 may execute the operation procedure shown in FIG. 8 (see section 5.3.5.5.x in FIG. 8).

[0077] (3.2.3) Example 3 In this operation example, an IE called secondaryCellGroupState (which may be a tentative name, see FIG. 7) may be provided under sPcellConfig.

[0078] When the secondaryCellGroupState is set to activate, the UE 200 may set the SCG configuration and / or the PSCell configuration to the activate state and resume the SCG radio bearer and transmission over the radio bearer.

[0079] On the other hand, if the secondaryCellGroupState is set to de-active, the UE200 may set the SCG configuration and / or the PSCell configuration to the de-active state (which may be the deactivate state) and suspend the SCG radio bearer and transmission over the SCG radio bearer.

[0080] (4) Actions and Effects According to the above-described embodiment, the following advantageous effects can be obtained: The UE 200 receives an RRC Reconfiguration including a reconfiguration parameter (ReconfigurationWithdeactivatedSCG) for a deactivated SCG, and can perform reconfiguration of the RRC (specific layer) for the SCG based on the reconfiguration parameter.

[0081] The UE 200 may also avoid using the conventional reconfiguration parameter (reconfigurationWithSync) included in the RRC Reconfiguration when the SCG is inactive.

[0082] This clarifies the RRC signaling required to set the deactivated SCG resource, and enables the addition / change function of the deactivated SCG. In other words, the wireless communication system 10 can avoid the use of T304 and the Dedicated RACH resource, and can achieve normal operation in the RRC even in the case of a deactivated SCG.

[0083] In this embodiment, when the SCG is inactive, the UE 200 may stop at least one of the SCG bearer and the SCG transmission. Therefore, the UE 200 can more reliably avoid using the SCG bearer in the case of a deactivated SCG, and can achieve normal operation.

[0084] (5) Other embodiments Although the embodiment has been described above, it will be apparent to those skilled in the art that the present invention is not limited to the description of the embodiment and that various modifications and improvements are possible.

[0085] For example, in the above-mentioned embodiment, the EN-DC in which the MN is an eNB and the SN is a gNB has been described as an example, but as mentioned above, other DCs may be used. Specifically, the NR-DC in which the MN is a gNB and the SN is a gNB, or the NE-DC in which the MN is a gNB and the SN is an eNB may be used.

[0086] Furthermore, SCG deactivation may be replaced with other terms having similar meanings, such as the above-mentioned deactivation and resting.

[0087] Moreover, the block diagrams (FIGS. 2 and 3) used in the description of the above-mentioned embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized by using one device that is physically or logically combined, or may be realized by using two or more devices that are physically or logically separated and directly or indirectly connected (for example, by using wires, wirelessly, etc.). The functional blocks may be realized by combining the one device or the multiple devices with software.

[0088] Functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs the function of transmission is called a transmitting unit or a transmitter. As described above, there is no particular limitation on the method of realization of any of these.

[0089] Furthermore, the above-mentioned eNB100A, gNB100B and UE200 (the devices) may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 9 is a diagram showing an example of a hardware configuration of the devices. As shown in Fig. 9, the devices may be configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

[0090] In the following description, the term "apparatus" may be interpreted as a circuit, a device, a unit, etc. The hardware configuration of the apparatus may be configured to include one or more of the apparatuses shown in the drawings, or may be configured to exclude some of the apparatuses.

[0091] Each functional block of the device (see Figure 2.3) is realized by any hardware element of the computer device, or a combination of the hardware elements.

[0092] In addition, each function in the device is realized by loading a specific software (program) onto hardware such as the processor 1001, memory 1002, etc., so that the processor 1001 performs calculations, controls communication by the communication device 1004, and controls at least one of reading and writing of data in the memory 1002 and storage 1003.

[0093] The processor 1001 controls the entire computer by running, for example, an operating system, and may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control unit, an arithmetic unit, a register, and the like.

[0094] Furthermore, the processor 1001 reads out programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these. As the programs, programs that cause a computer to execute at least a part of the operations described in the above-mentioned embodiments are used. Furthermore, the above-mentioned various processes may be executed by one processor 1001, or may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The programs may be transmitted from a network via a telecommunications line.

[0095] The memory 1002 is a computer-readable recording medium, and may be configured by at least one of, for example, a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically Erasable Programmable ROM (EEPROM), a Random Access Memory (RAM), etc. The memory 1002 may also be called a register, a cache, a main memory (primary storage device), etc. The memory 1002 can store a program (program code), a software module, etc., capable of executing a method according to an embodiment of the present disclosure.

[0096] Storage 1003 is a computer-readable recording medium, and may be composed of at least one of, for example, an optical disk such as a Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray (registered trademark) disk), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, and the like. Storage 1003 may be referred to as an auxiliary storage device. The above-mentioned recording medium may be, for example, a database, a server, or other suitable medium including at least one of memory 1002 and storage 1003.

[0097] The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also called, for example, a network device, a network controller, a network card, or a communication module.

[0098] The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like to realize, for example, at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD).

[0099] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, an LED lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0100] In addition, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0101] Furthermore, the device may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc., and some or all of the functional blocks may be realized by the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0102] Furthermore, the notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB)), other signals, or a combination of these. Furthermore, the RRC signaling may be called an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0103] Each aspect / embodiment described in the present disclosure may be applied to at least one of a system using Long Term Evolution (LTE), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), Future Radio Access (FRA), New Radio (NR), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), other suitable systems, and next-generation systems extended based on these. In addition, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A and 5G, etc.) may be applied.

[0104] The order of the steps, sequences, flow charts, etc. of each aspect / embodiment described in this disclosure may be changed unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0105] In the present disclosure, a specific operation performed by a base station may be performed by its upper node in some cases. In a network consisting of one or more network nodes having a base station, it is clear that various operations performed for communication with a terminal may be performed by at least one of the base station and other network nodes other than the base station (e.g., MME or S-GW, etc., but are not limited to these). Although the above example illustrates a case in which there is one other network node other than the base station, it may also be a combination of multiple other network nodes (e.g., MME and S-GW).

[0106] Information, signals (information, etc.) may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), and may be input and output via multiple network nodes.

[0107] The input / output information may be stored in a specific location (e.g., memory) or may be managed using a management table. The input / output information may be overwritten, updated, or appended. The output information may be deleted. The input information may be transmitted to another device.

[0108] The determination may be based on a value represented by a single bit (0 or 1), a Boolean (true or false) value, or a numerical comparison (e.g., comparison with a predetermined value).

[0109] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched according to execution. In addition, notification of predetermined information (e.g., notification that "X is the case") is not limited to being done explicitly, but may be done implicitly (e.g., not notifying the predetermined information).

[0110] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0111] Additionally, software, instructions, information, etc. may be transmitted or received over a transmission medium. For example, if the software is transmitted from a website, server, or other remote source using wired and / or wireless technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave, etc.), then these wired and / or wireless technologies are included within the definition of transmission media.

[0112] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0113] In addition, the terms described in this disclosure and the terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Also, a signal may be a message. Also, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0114] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0115] In addition, the information, parameters, etc. described in the present disclosure may be represented using absolute values, may be represented using relative values ​​from a predetermined value, or may be represented using other corresponding information. For example, a radio resource may be indicated by an index.

[0116] The names used for the above-mentioned parameters are not limiting in any way. Furthermore, the formulas using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not limiting in any way.

[0117] In this disclosure, terms such as "base station (BS)", "radio base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", "component carrier", etc. may be used interchangeably. A base station may also be referred to by terms such as a macro cell, a small cell, a femto cell, a pico cell, etc.

[0118] A base station can accommodate one or more (e.g., three) cells (also called sectors). When a base station accommodates multiple cells, the entire coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can also be provided with communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head: RRH)).

[0119] The term "cell" or "sector" refers to part or all of the coverage area of ​​a base station and / or a base station subsystem that provides communication services within that coverage.

[0120] In this disclosure, the terms "Mobile Station (MS)", "user terminal", "User Equipment (UE)", "terminal", etc. may be used interchangeably.

[0121] A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0122] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned moving body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may include a device that does not necessarily move during communication operation. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0123] Furthermore, a base station in the present disclosure may be read as a mobile station (user terminal, the same applies below). For example, each aspect / embodiment of the present disclosure may be applied to a configuration in which communication between a base station and a mobile station is replaced with communication between multiple mobile stations (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the mobile station may be configured to have the functions of a base station. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to communication between terminals (for example, "side"). For example, an uplink channel, a downlink channel, etc. may be read as a side channel.

[0124] Similarly, a mobile station in the present disclosure may be interpreted as a base station, in which case the base station may have the functions of a mobile station. A radio frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe. A subframe may further be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0125] Numerology may be a communication parameter that applies to the transmission and / or reception of a signal or channel, and may indicate, for example, at least one of a SubCarrier Spacing (SCS), a bandwidth, a symbol length, a Cyclic Prefix length, a Transmission Time Interval (TTI), a number of symbols per TTI, a radio frame structure, a particular filtering operation that the transceiver performs in the frequency domain, a particular windowing operation that the transceiver performs in the time domain, etc.

[0126] A slot may consist of one or more symbols in the time domain (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol, a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) A slot may be a numerology-based unit of time.

[0127] A slot may include multiple minislots. Each minislot may be composed of one or more symbols in the time domain. A minislot may also be called a subslot. A minislot may be composed of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0128] A radio frame, a subframe, a slot, a minislot, and a symbol each represent a time unit for transmitting a signal. The radio frame, the subframe, the slot, the minislot, and the symbol may each be referred to by a different name.

[0129] For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0130] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0131] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) in which a transport block, a code block, a code word, etc. are actually mapped may be shorter than the TTI.

[0132] In addition, when one slot or one minislot is called TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit of scheduling. Also, the number of slots (minislots) constituting the minimum time unit of scheduling may be controlled.

[0133] A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, etc.

[0134] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0135] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of the numerology, for example, 12. The number of subcarriers included in an RB may be determined based on the numerology.

[0136] In addition, the time domain of the RB may include one or more symbols and may be one slot, one minislot, one subframe, or one TTI in length. Each of one TTI, one subframe, etc. may be composed of one or more resource blocks.

[0137] One or more RBs may be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, or the like.

[0138] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0139] A Bandwidth Part (BWP), which may also be referred to as a fractional bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a numerology on a carrier, where the common RBs may be identified by the index of the RBs relative to a common reference point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0140] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be configured for a UE within one carrier.

[0141] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell", "carrier", etc. in this disclosure may be replaced with "BWP".

[0142] The above-mentioned structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0143] The terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using at least one of one or more wires, cables, and printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

[0144] The reference signal may also be abbreviated as Reference Signal (RS), and may be called a pilot depending on the applicable standard.

[0145] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0146] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0147] Any reference to an element using a designation such as "first," "second," etc., used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed therein or that the first element must precede the second element in some way.

[0148] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, as is the term "comprising." Further, as used in this disclosure, the term "or" is not intended to be an exclusive or.

[0149] In this disclosure, where articles have been added due to translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0150] As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., searching in a table, database, or other data structure), ascertaining, and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in a memory), and the like. In addition, "judgment" and "decision" can include considering resolving, selecting, choosing, establishing, comparing, etc., to be a "judgment" or "decision." In other words, "judgment" and "decision" can include considering some action to be a "judgment" or "decision." In addition, "judgment" can be interpreted as "assuming," "expecting," "considering," etc.

[0151] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0152] Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure. [Explanation of symbols]

[0153] 10. Wireless communication systems 20 E-UTRAN 30 NGRAN 40 UPF 100A eNB 100B gNB 110 Wireless Communication Division 120 RRC processing unit 130 DC Processing Unit 140 Control section 200UE 210 Wireless Communication Department 220 RRC Processing Unit 230 DC Processing Unit 240 Control Unit 1001 Processor 1002 Memory 1003 Storage 1004 Communication equipment 1005 Input Device 1006 Output device 1007 Bus

Claims

1. A receiving unit for receiving a radio resource control layer reconfiguration message including a reconfiguration parameter of a secondary cell group; A control unit that avoids using the reconfiguration parameters included in the reconfiguration message when the secondary cell group is in an inactive state. A terminal comprising:

2. The terminal described in claim 1, wherein the control unit avoids the use of random access resources or timer values ​​included in the reconfiguration parameters.

3. The terminal according to claim 1 , wherein the control unit determines whether the secondary cell group is in an inactive state based on an information element included in the reconfiguration message.

4. Receiving a radio resource control layer reconfiguration message; avoiding use of reconfiguration parameters included in the reconfiguration message when a secondary cell group is in an inactive state. A wireless communication method for a terminal comprising:

5. A wireless base station and a terminal, The wireless base station A transmitter for transmitting a radio resource control layer reconfiguration message including a reconfiguration parameter of a secondary cell group, The terminal includes: A receiving unit for receiving the reconfiguration message; A control unit that avoids use of the reconfiguration parameters included in the reconfiguration message when the secondary cell group is in an inactive state. Wireless communication system.

Images