Terminal, base station and wireless communication method

Abstract

A terminal according to the present invention is provided with: a reception unit that receives minimum reception level information pertaining to a minimum reception level for a terminal with a specific number of antennas in a specific cell and / or minimum quality level information pertaining to a minimum quality level for a terminal with a specific number of antennas in a specific cell; and a control unit that controls cell selection and / or cell reselection on the basis of a reception level parameter derived on the basis of the minimum reception level information, and / or a quality level parameter derived on the basis of the minimum quality level information.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is based on Japanese Patent Application No. 2021-055161, filed on March 29, 2021, and claims the benefit of priority thereto, the entire contents of which are incorporated herein by reference. [Technical field]

[0002] The present disclosure relates to a terminal and a wireless communication method. [Background technology]

[0003] The Third Generation Partnership Project (3GPP), an international standardization organization, has specified Release 15 of New Radio (NR), a fifth generation (5G) RAT, as a successor to Long Term Evolution (LTE), a 3.9th generation radio access technology (RAT), and LTE-Advanced, a fourth generation RAT (for example, Non-Patent Document 1). LTE and / or LTE-Advanced are also called Evolved Universal Terrestrial Radio Access (E-UTRA).

[0004] In E-UTRA and / or NR, cell selection is performed to select a cell on which a terminal camps and / or cell reselection is performed to reselect the cell. [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] 3GPP TS 38.300 V15.2.0 (2018-06) Summary of the Invention

[0006] In 3GPP (e.g., Release 17 of NR), it is considered to support NR terminals (hereinafter referred to as "reduced capability (RedCap) terminals") that are assumed to have lower performance and price range than NR terminals introduced in Release 15 or 16 (hereinafter referred to as "existing NR terminals"). It is also considered to specify the RedCap terminals as a specific type of terminal. It is also considered to support terminals with a specific number of antennas (e.g., terminals with one or two receive antennas) that are reduced from a given number of antennas (e.g., four or two receive antennas).

[0007] The coverage of the above-mentioned terminals having a specific type and / or a specific number of antennas is expected to be degenerate compared to existing NR terminals and / or terminals having a number of antennas greater than the specific number of antennas. For this reason, terminals having a specific type and / or a specific number of antennas may not be able to appropriately select and / or reselect a cell to camp on in cell selection and / or cell reselection. An object of the present disclosure is to provide a terminal and a wireless communication method capable of appropriately controlling cell selection and / or cell reselection.

[0008] A terminal according to an embodiment of the present disclosure includes a receiving unit that receives minimum reception level information on a minimum reception level for a terminal with a specific number of antennas in a specific cell, and / or minimum quality level information on a minimum quality level for a terminal with a specific number of antennas in the specific cell, and a control unit that controls cell selection and / or cell reselection based on a reception level parameter derived based on the minimum reception level information, and / or a quality level parameter derived based on the minimum quality level information. Also, a terminal according to an embodiment of the present disclosure includes a receiving unit that receives minimum reception level information on a minimum reception level in a specific cell, and / or minimum quality level information on a minimum quality level in the specific cell, and a control unit that controls cell selection and / or cell reselection based on a reception level parameter derived based on the minimum reception level derived based on the minimum reception level information and an offset for a terminal with a specific number of antennas for the minimum reception level, and / or a quality level parameter derived based on the minimum quality level derived based on the minimum quality level information and an offset for a terminal with a specific number of antennas for the minimum quality level.

[0009] According to one aspect of the present disclosure, cell selection and / or cell reselection can be appropriately controlled. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram showing an example of an overview of a wireless communication system according to this embodiment. [Diagram 2] FIG. 2 is a diagram illustrating an example of degeneration of coverage for a terminal 10 of a particular type and / or number of antennas. [Diagram 3] FIG. 3 is a diagram showing an example of an access denial determination operation according to the present embodiment. [Figure 4] FIG. 4 is a diagram showing an example of a specification change related to the RedCap access information and the single Rx access information according to the present embodiment. [Diagram 5] FIG. 5 is a diagram showing an example of the cell selection criterion S1 according to the present embodiment. [Figure 6] FIG. 6 is a diagram showing an example of a specification change related to the cell selection criterion S1 according to the present embodiment. [Figure 7] FIG. 7 is a diagram showing an example of a specification change related to the cell selection criterion S1 according to the present embodiment. [Figure 8] FIG. 8 is a diagram showing an example of a specification change related to the cell selection criterion S1 according to the present embodiment. [Figure 9] FIG. 9 is a diagram showing an example of the cell selection criterion S2 according to the present embodiment. [Figure 10] FIG. 10 is a diagram showing an example of a specification change related to the cell selection criterion S2 according to the present embodiment. [Figure 11] FIG. 11 is a diagram showing an example of a specification change related to the cell selection criterion S2 according to the present embodiment. [Figure 12] FIG. 12 is a diagram showing an example of a specification change related to the cell selection criterion S2 according to the present embodiment. [Figure 13] FIG. 13 is a diagram showing an example of the hardware configuration of each device in the wireless communication system according to this embodiment. [Figure 14] FIG. 14 is a diagram illustrating an example of a functional block configuration of a terminal according to this embodiment. [Figure 15] FIG. 15 is a diagram illustrating an example of a functional block configuration of a base station according to this embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The embodiments of the present disclosure will be described with reference to the accompanying drawings. In the drawings, components with the same reference numerals may have the same or similar configurations.

[0012] Fig. 1 is a diagram showing an example of an overview of a wireless communication system according to the present embodiment. As shown in Fig. 1, the wireless communication system 1 may include a terminal 10, a base station 20, and a core network 30. Note that the numbers of terminals 10 and base stations 20 shown in Fig. 1 are merely examples and are not limited to the numbers shown in the figure.

[0013] The radio access technology (RAT) of the wireless communication system 1 is assumed to be, for example, NR, but is not limited thereto, and various RATs such as, for example, RATs of the sixth generation or later can be used.

[0014] The terminal 10 is a specific terminal or device, such as a smartphone, a personal computer, an in-vehicle terminal, an in-vehicle device, a stationary device, a telematics control unit (TCU), etc. The terminal 10 may be called a user equipment (UE), a mobile station (MS), a terminal (User Terminal), a radio apparatus, a subscriber terminal, an access terminal, etc. The terminal 10 may be of a mobile type or a fixed type. The terminal 10 is configured to be capable of communicating using, for example, NR as a RAT.

[0015] The base station 20 forms one or more cells C and communicates with the terminal 10 using the cells. The cell C may be interchangeably referred to as a serving cell, a carrier, a component carrier (CC), or the like. For example, the base station 20 may set one primary cell and one or more secondary cells for the terminal 10 and communicate with the terminal 10 (also referred to as carrier aggregation). That is, the one or more cells C include at least a primary cell, and may also include a secondary cell.

[0016] The base station 20 may be called a gNodeB (gNB), en-gNB, a Next Generation-Radio Access Network (NG-RAN) node, a low-power node, a Central Unit (CU), a Distributed Unit (DU), a gNB-DU, a Remote Radio Head (RRH), an Integrated Access and Backhaul / Backhauling (IAB) node, etc. The base station 20 is not limited to one node, and may be configured with multiple nodes (for example, a combination of a lower node such as a DU and an upper node such as a CU).

[0017] The core network 30 is, for example, a core network (5G Core Network: 5GC) compatible with NR, but is not limited to this. An apparatus on the core network 30 (hereinafter also referred to as a "core network apparatus") performs mobility management such as paging and location registration of the terminal 10. The core network apparatus may be connected to the base station 20 via a predetermined interface (for example, an S1 or NG interface).

[0018] The core network device may include, for example, at least one of an Access and Mobility Management Function (AMF) that manages C-plane information (e.g., information related to access and mobility management, etc.) and a User Plane Function (UPF) that controls the transmission of U-plane information (e.g., user data).

[0019] In the wireless communication system 1, a terminal 10 receives a downlink (DL) signal and / or transmits an uplink (UL) signal from a base station 20. One or more cells C are configured in the terminal 10, and at least one of the configured cells is activated. The maximum bandwidth of each cell is, for example, 20 MHz or 400 MHz.

[0020] Furthermore, the terminal 10 performs a cell search based on a synchronization signal (e.g., a Primary Synchronization Signal (PSS) and / or a Secondary Synchronization Signal (PSS)) from the base station 20. The cell search is a procedure in which the terminal 10 acquires time and frequency synchronization in a cell and detects an identifier of the cell (e.g., a physical layer cell ID). A block including the above-mentioned synchronization signal, a broadcast channel (e.g., a Physical Broadcast Channel (PBCH)), and a demodulation reference signal (Demodulation Reference Signal (DMRS)) of the broadcast channel is also called a synchronization signal block (SSB), SS / PBCH block, etc. The SSB is provided at a predetermined period.

[0021] For example, the terminal 10 receives a Master Information Block (MIB) via the PBCH. The terminal 10 may determine whether or not the cell is a cell for which access is prohibited (hereinafter, referred to as a "barred cell") based on a parameter (e.g., "cellBarred") in the MIB. If the cell is a barred cell, the terminal 10 may reselect another cell having the same carrier frequency as the barred cell. The parameter may be called an information item (IE), etc.

[0022] On the other hand, if the cell is not a prohibited cell, the terminal 10 may acquire a system information block (SIB) (e.g., SIBx, where x=1, 2, ...) via a downlink shared channel (e.g., a physical downlink shared channel (PDSCH)) based on the MIB. Specifically, the terminal 10 may determine a search space and / or a control resource set (CORESET) based on a parameter in the MIB (e.g., "pdcch-ConfigSIB1"), and perform monitoring of downlink control information (DCI) in a search space associated with the CORESET. The monitoring of the DCI is also called blind decoding or the like. The terminal 10 receives SIB1 via a PDSCH scheduled by the DCI detected in the search space. The terminal 10 may receive SIBs other than SIB1 (e.g., SIB2 and SIB4, etc.) via a PDSCH scheduled by the DCI. Note that the system information may include the MIB and / or the SIB.

[0023] Here, the DCI may include DCI of one or more formats. DCI of a given format may be called a DCI format. A cyclic redundancy check (CRC) bit (also called a CRC parity bit) scrambled by a given identifier (e.g., System Information radio network temporary identifier: SI-RNTI) may be attached to the DCI used for scheduling the PDSCH that transmits the SIB (e.g., SIB1, 2, or 4). In addition, the DCI may be, for example, a downlink assignment (e.g., DCI format 1_0) used for scheduling the PDSCH.

[0024] (cell selection / reselection) A terminal 10 in an idle state, an inactive state, or a connected state with a specific timer running selects and / or reselects a cell to camp on (hereinafter, referred to as a "camped cell") based on a predetermined criterion (hereinafter, referred to as a "cell selection criterion"). The camped cell may be rephrased as, for example, a "serving cell", a "suitable cell", a "better cell", etc.

[0025] Here, the idle state is a state in which a Radio Resource Control (RRC) layer connection (hereinafter referred to as an "RRC connection") between the terminal 10 and the base station 20 has not been established, and is also called RRC_IDLE, idle mode, RRC idle mode, etc. The terminal 10 in the idle state receives system information broadcast by the camped-on cell. When an RRC connection is established, the terminal 10 in the idle state transitions to the connected state.

[0026] The inactive state is a state in which the RRC connection is established but suspended, and is also called an RRC_INACTIVE state, an inactive mode, an RRC inactive mode, etc. The terminal 10 in the inactive state receives system information broadcast by the camped-on cell. The terminal 10 in the inactive state transitions to a connected state when the RRC connection is resumed, and transitions to an idle state when the RRC connection is released.

[0027] The connected state is a state in which the RRC connection is established, and is also called an RRC_CONNECTED state, a connected mode, an RRC connected mode, etc. The terminal 10 in the connected state transitions to an idle state when the RRC connection is released, and transitions to an inactive state when the RRC connection is suspended.

[0028] In cell selection, the terminal 10 selects a camped-on cell based on cell selection criteria S. For example, the terminal 10 may select a cell that satisfies the cell selection criteria S as a camped-on cell from the strongest cells of each carrier frequency searched by cell search. Note that the carrier frequency is identified by a predetermined number (for example, Absolute Radio Frequency Channel Number (ARFCN)), and can be referred to as an RF reference frequency, an NR frequency, an EUTRA frequency, a center frequency, a channel raster, a frequency, etc. One or more cells C may be provided in each carrier frequency.

[0029] In cell reselection, the terminal 10 reselects a better cell than the cell selected by cell selection based on the cell selection criterion S. In cell reselection, for example, a cell having the same carrier frequency as the camped-on cell (hereinafter referred to as "intra-frequency") and / or a carrier frequency different from the camped-on cell (hereinafter referred to as "inter-frequency") may be reselected. In addition, the terminal 10 may control the intra-frequency and / or inter-frequency cell reselection based on information on the priority of one or more carrier frequencies (hereinafter referred to as "priority information", for example, "CellReselectionPriority" and / or "CellReselectionSubPriority").

[0030] Next, the cell selection criterion S used in the cell selection and / or cell reselection (hereinafter referred to as "cell selection / reselection") will be described. The cell selection criterion S is a criterion based on a parameter related to the reception level of a specific cell (hereinafter referred to as "Srxlev") and / or a parameter related to the quality level of a specific cell (hereinafter referred to as "Squal"). Srxlev and Squal are also called reception level parameter and quality level parameter, respectively. The cell selection criterion S may be that the Srxlev and / or Squal exceeds a predetermined value (e.g., 0), and may be represented by the following formula 1, for example. [Formula 1] Srxlev>0 and Squal>0 Srxlev = Q rxlevmeas - (Q rxlevmin + Q rxlevminoffset ) - P compensation - Qoffset temp Squal = Q qualmeas - (Q qualmin + Q qualminoffset ) - Qoffset temp

[0031] As illustrated in Equation 1, Srxlev may be derived based on at least one of the following parameters: The reception level measured by the terminal 10 for a specific cell (hereinafter, “Q rxlevmeas " For example, Reference Signal Received Power (RSRP) The minimum reception level required for a specific cell (hereinafter referred to as "Q rxlevmin ") Q rxlevmin offset to rxlevminoffset ") A compensation value based on the maximum transmission power of the terminal 10 (hereinafter, “P compensation ") A temporary offset applied to a particular cell (hereafter referred to as Qoffset temp ")

[0032] Squal may also be derived based on at least one of the following parameters: The quality measured by the terminal 10 for a particular cell (hereinafter, “Q qualmeas " For example, Reference Signal Received Quality (RSRQ) The minimum quality level required for a particular cell (hereafter referred to as "Q qualmin ") Q qualmeas offset to qualminoffset ") Qoffset temp

[0033] In addition, P compensation may be a predetermined value, or may be a value based on the maximum transmission power level of the terminal 10 ("P EMAX ", "P EMAX1 " and "P EMAX2 ") and / or the maximum RF output class of the terminal 10 ("P PowerClass For example, in a frequency range (FR) 1 (e.g., 410 MHz to 7125 MHz), P compensation may be calculated by the following formula 2. On the other hand, in FR2 (for example, 24250 MHz to 52600 MHz), P compensation may be set to 0 (zero). [Formula 2] max(P EMAX1 - P PowerClass , 0) - (min(P EMAX2 , P PowerClass ) - min(P EMAX1 , P PowerClass )) (dB) or max(P EMAX1 - P PowerClass , 0) (dB)

[0034] In addition, Q rxlevmin , Q rxlevminoffset , Qoffset temp , Q qualmin and Qqualminoffset Information regarding at least one of the above may be notified in the system information. rxlevmin , Q rxlevminoffset , Qoffset temp , Q qualmin and Q qualminoffset The information on at least one of the above may be included in at least one of the first system information (e.g., SIB1) used for cell selection, the second system information (e.g., SIB2) used for intra-frequency cell reselection, and the third system information (e.g., SIB4) used for inter-frequency cell reselection. In the following, SIB1, SIB2, and SIB4 are illustrated as examples of the above first system information, second system information, and third system information, but it goes without saying that names other than SIB1, SIB2, and SIB4 may be used as long as they are similar system information. SIB1 includes information on cell selection (e.g., "cellSelectionInfo"), and the information is Q. rxlevmin , Q rxlevminoffset , Qoffset temp , Q qualmin and Q qualminoffset The SIB2 may include information regarding intra-frequency cell reselection (e.g., "intraFreqCellReselectionInfo"), and the information may include information regarding Q rxlevmin , Q rxlevminoffset , Qoffset temp , Q qualmin and Q qualminoffset The SIB4 may include information regarding inter-frequency cell reselection (e.g., "InterFreqCarrierFreqInfo"), and the information may include information regarding Q rxlevmin , Q rxlevminoffset , Qoffset temp , Q qualmin and Q qualminoffset The information may include information regarding at least one of the above.

[0035] (RedCap) 3GPP (e.g., Release 17 of NR) is considering supporting RedCap terminals, which are expected to have lower performance and price range than existing NR terminals introduced in Release 15 or 16. The RedCap terminals are expected to be used in, for example, industrial wireless sensors, video surveillance, wearable devices, etc.

[0036] As the capabilities of the RedCap terminal that are reduced from the existing NR terminal, for example, the number of antennas (e.g., from 2 or 4 receiving antennas to 1 or 2 receiving antennas), the supported bandwidth (e.g., 20 MHz at the time of initial access of FR1), a change from full duplex to half duplex, the maximum modulation method (e.g., from 256QAM to 64QAM), and at least one of the maximum number of Multiple Input and Multiple Output (MIMO) are being considered. The RedCap terminal may be identified by a specific type. For example, the existing NR terminal and the RedCap terminal may be specified as different types (e.g., types 0 and 1, etc.). The type may be rephrased as a UE type, a category, a UE category, etc.

[0037] Also, the RedCap terminal identified by a specific type may have different capabilities. For example, multiple RedCap terminals with different numbers of receiving antennas (for example, RedCap terminals with a single receiving antenna, two receiving antennas, and three or more receiving antennas, etc.) may be provided. In this way, multiple RedCap terminals with different capabilities may be identified by the above types or subtypes of the above types. Hereinafter, a terminal 10 with a single receiving antenna or a RedCap terminal with a single receiving antenna is called a "single Rx terminal". Also, a terminal 10 with two receiving antennas or a RedCap terminal with two receiving antennas is called a "two Rx terminal". Incidentally, having a single receiving antenna and having two receiving antennas may be rephrased as having a single receiver and a dual receiver, respectively.

[0038] It is assumed that the coverage of a terminal 10 of the above-mentioned specific type (e.g., RedCap terminal) and / or with a specific number of antennas (e.g., single Rx terminal or 2 Rx terminal) is degenerated compared to a legacy NR terminal or a terminal 10 with a number of antennas greater than the specific number of antennas. FIG. 2 is a diagram showing an example of degeneration of the coverage of a terminal 10 of a specific type and / or with a specific number of antennas. For example, in FIG. 2, terminal 10A is a single Rx terminal, and terminal 10B is a legacy NR terminal equipped with four receiving antennas.

[0039] For example, in FIG. 2, the Q rxlevmeas and Q qualmeas Since the effect of reception diversity cannot be obtained, the transmission efficiency is lower than that of the terminal 10B having multiple reception antennas. On the other hand, when the terminals 10A and 10B have the same parameter (for example, Q rxlevmin , Q rxlevminoffset , Qoffset temp , Q qualmin and Q qualminoffset When the evaluation of the cell selection criterion S is performed based on at least one of the following, the Q of the terminal 10A rxlevmeasand Q qualmeas is smaller than that of terminal 10B, the range in which terminal 10A satisfies cell selection criterion S (for example, Srxlev>0 and Squal>0) may be degenerate compared to the range in which terminal 10B satisfies the cell selection criterion S. That is, the coverage of terminal 10A may be degenerate compared to the coverage of terminal 10B.

[0040] In order to complement the coverage of such a terminal 10 of a specific type and / or a specific number of antennas (e.g., a RedCap terminal and / or a single Rx terminal), it is also assumed that the channel is repeatedly transmitted. However, the coverage extension by repetition may reduce the utilization efficiency of radio resources (e.g., frequency domain resources and / or time domain resources).

[0041] Therefore, in this embodiment, (1) a terminal 10 of a specific type and / or with a specific number of antennas is prohibited from accessing a specific cell, thereby preventing a decrease in the utilization efficiency of radio resources in the specific cell, and (2) a terminal 10 of a specific type and / or with a specific number of antennas is allowed to access a specific cell, while preventing the degeneration of the coverage of the terminal 10.

[0042] In the following, for example, the terminal 10 of a specific type is a RedCap terminal, and the terminal 10 of a specific number of antennas is a single Rx terminal or a 2 Rx terminal, but it goes without saying that the terminal 10 of a specific type and / or a specific number of antennas is not limited to the above. For example, the terminal of a specific number of antennas may be a terminal with a number of antennas that is reduced compared to the terminal 10 of a predetermined number of antennas, and for example, if the predetermined number of antennas is 8, the specific number of antennas may be 4.

[0043] (1) If access is prohibited A case will be described where at least one of the access of a RedCap terminal, a single Rx terminal, and a 2Rx terminal to a specific cell is prohibited (restricted or not permitted). In this case, the terminal 10 judges whether or not access to the specific cell is prohibited based on at least one of information on the access of a RedCap terminal to the specific cell (hereinafter referred to as "RedCap access information"), information on the access of a single Rx terminal in the specific cell (hereinafter referred to as "single Rx access information"), and information on the access of a 2Rx terminal in the specific cell (hereinafter referred to as "2Rx access information").

[0044] Here, the RedCap access information is, for example, information regarding permission or prohibition of access to a specific cell by a RedCap terminal. In the following, the RedCap access information is information regarding permission of the access (for example, set to "true" or "1" when the access is permitted), is included in the system information (for example, SIB1) when the access is permitted, and is not included in the system information when the access is prohibited, but is not limited to this. For example, the RedCap access information may indicate that the access is prohibited (for example, set to "true" or "1" when the access is prohibited), is not included in the system information when the access is permitted, and is included in the system information when the access is prohibited.

[0045] Also, the single Rx access information and the 2 Rx access information are, for example, information on permission or prohibition of access to a specific cell by a single Rx terminal and a 2 Rx terminal, respectively. For example, the single Rx access information and the 2 Rx access information are information on permission of the access (for example, set to "true" or "1" when the access is permitted), and are included in the system information (for example, SIB1) when the access is permitted, and are not included in the system information when the access is prohibited, but are not limited thereto. For example, the single Rx access information and the 2 Rx access information indicate that the access is prohibited (for example, set to "true" or "1" when the access is prohibited), and may be not included in the system information when the access is permitted, and may be included in the system information when the access is prohibited.

[0046] For example, the terminal 10 receives system information. The terminal 10 may determine whether access to the specific cell is prohibited based on whether the RedCap access information is included in the system information and / or whether the single Rx access information and / or the 2 Rx access information is included in the system information.

[0047] The terminal 10 may also determine whether access to the particular cell is prohibited based on whether the terminal 10 is a RedCap terminal and / or whether the terminal 10 is a single Rx terminal or a 2 Rx terminal.

[0048] 3 is a diagram showing an example of an access denial determination operation according to the present embodiment. In step S101, the terminal 10 receives system information (for example, SIB1).

[0049] In step S102, the terminal 10 determines whether it is in an idle state, an inactive state, or a connected state in which a specific timer (e.g., timer T311) is operating. The specific timer specifies the time until the RRC connection is re-established, and may be started when the re-establishment procedure is started and stopped when a specific cell is selected. When the specific timer expires, the terminal 10 may transition to the idle state. If the terminal 10 is in a connected state in which the specific timer is not operating (step S102; NO), this operation ends.

[0050] In step S103, the terminal 10 judges whether or not the terminal 10 is a RedCap terminal. If the terminal 10 is not a RedCap terminal (step S103; NO), the operation proceeds to step S110.

[0051] On the other hand, if the terminal 10 is a RedCap terminal (step S103; YES), in step S104, the terminal 10 determines whether or not the RedCap terminal is permitted to access a specific cell. For example, the terminal 10 may determine whether or not RedCap access information is included in the system information received in step S101.

[0052] If the RedCap terminal is not permitted to access the specific cell (step S104; NO), this operation proceeds to step S109. On the other hand, if the RedCap terminal is permitted to access the specific cell (step S104; YES), in step S105, the terminal 10 determines whether or not the single Rx terminal is permitted to access the specific cell. For example, the terminal 10 may determine whether or not the single Rx access information is included in the system information received in step S101. If the single Rx terminal is permitted to access the specific cell (step S105; YES), this operation proceeds to step S107.

[0053] If the access of the single Rx terminal to the particular cell is not permitted (step S105; NO), in step S106, the terminal 10 judges whether the terminal 10 is a single Rx terminal. If the terminal 10 is a single Rx terminal (step S106; YES), this operation proceeds to step S109. If the terminal 10 is not a single Rx terminal (step S106; NO), this operation proceeds to step S107.

[0054] In step S107, the terminal 10 judges whether or not the access of the 2Rx terminal to the specific cell is permitted. For example, the terminal 10 may judge whether or not the 2Rx access information is included in the system information received in step S101. If the access of the 2Rx terminal to the specific cell is permitted (step S107; YES), the operation proceeds to step S110.

[0055] If the 2Rx terminal is not permitted to access the particular cell (step S107; NO), in step S108, the terminal 10 determines whether the terminal 10 is a 2Rx terminal. If the terminal 10 is a 2Rx terminal (step S108; YES), the operation proceeds to step S109. If the terminal 10 is not a 2Rx terminal (step S108; NO), the operation proceeds to step S110.

[0056] In step S109, the terminal 10 determines that access to a specific cell is prohibited. As described above, the terminal 10 can determine that access to a specific cell is prohibited by using, for example, the following determination conditions. 1> if in RRC_IDLE or RRC_INACTIVE or in RRC_CONNECTED while T311 is running; 2> if the UE is a reduced capability UE according to TS 38.306

[26] : 3> if redCap-AccessAllowed is not included in SIB1; or 3>if redCap-AccessAllowed is set to true in SIB1, and singleRx-AccessAllowed is not included in SIB1, and the reduced capability UE supports no more than a single receiver; or 3> if redCap-AccessAllowed is set to true in SIB1, and twoRx-AccessAllowed is not included in SIB1, and the reduced capability UE supports no more than a dual receiver: 4> consider the cell as barred in accordance with TS 38.304

[20] ;

[0057] In step S110, the terminal 10 determines whether to camp on a specific cell based on the cell selection criterion S. Specifically, if the specific cell satisfies the cell selection criterion S, the terminal 10 may camp on the specific cell.

[0058] 3 is merely an example, and some steps may be omitted, or steps not shown may be added. In addition, the order of at least some steps may be changed. For example, the order of determination of steps S105 and S106 and steps S107 and S108 may be changed.

[0059] Fig. 4 is a diagram showing an example of a specification change related to RedCap access information and single Rx access information according to the present embodiment. For example, in Fig. 4, information related to cell access in SIB1 (e.g., "cellAccessRelatedInfo") includes RedCap access information (e.g., "redCap-AccessAllowed"), single Rx access information (e.g., "singleRx-AccessAllowed"), and 2Rx access information (e.g., "twoRx-AccessAllowed").

[0060] For example, in FIG. 4, if a RedCap terminal is permitted to access a particular cell, the RedCap access information is set to true and included in SIB1. Also, if a single Rx terminal is permitted to access a particular cell, the single Rx access information is set to true and included in SIB1. Also, if a 2Rx terminal is permitted to access a particular cell, the 2Rx access information is set to true and included in SIB1.

[0061] In addition, the single Rx access information may be a conditional presence. Specifically, the single Rx access information is included in SIB1 when the RedCap access information indicates permission for access of the RedCap terminal (for example, when it is set to true in FIG. 4), and may not be included in SIB1 in other cases. In addition, the 2Rx access information may also be a conditional presence. Specifically, the 2Rx access information is included in SIB1 when the cell is on a frequency band in which it is essential for the terminal 10 to support four receiving antennas, and may not be included in SIB1 in other cases.

[0062] Note that the specification change example shown in FIG. 4 is merely an example and is not limited to the one shown in the figure. For example, at least one of the RedCap access information, the single Rx access information, and the 2Rx access information may be set to true when access is not permitted (i.e., restricted). Also, the single Rx access information and / or the 2Rx access information may not be the above-mentioned conditional presence. Also, SIB1 may include at least one of the RedCap access information, the single Rx access information, and the 2Rx access information.

[0063] As described above, when restricting access to at least one specific cell of a RedCap terminal, a single Rx terminal, and a 2Rx terminal, it is possible to avoid the occurrence of degeneration of the coverage of at least one of the RedCap terminal, the single Rx terminal, and the 2Rx terminal in the specific cell. This makes it possible to prevent a decrease in the utilization efficiency of radio resources caused by repeated transmission for coverage complementation.

[0064] In the above, whether or not the access to the specific cell is prohibited is determined based on whether or not the RedCap access information is included in the system information and / or whether or not the single Rx access information and / or the 2 Rx access information is included in the system information, but this is not limited to this. For example, if the RedCap access information, the single Rx access information, or the 2 Rx access information is included in the system information regardless of whether the access is permitted or prohibited, the terminal 10 may determine whether or not the access to the specific cell is prohibited based on the value of the RedCap access information, the single Rx access information, or the 2 Rx access information in the system information.

[0065] (2) When access is permitted Next, a case where at least one of a RedCap terminal, a single Rx terminal, and a 2Rx terminal is permitted to access a specific cell will be described. In this case, the coverage of at least one of a RedCap terminal, a single Rx terminal, and a 2Rx terminal may be expanded by using cell selection criteria S1 or S2, which is a relaxed version of the cell selection criteria S for a single Rx terminal or a 2Rx terminal.

[0066] In the following, we will mainly explain the case where cell selection criteria S1 and S2 are used for single Rx terminals. However, when using cell selection criteria S1 and S2 for 2 Rx terminals, the "single Rx terminal" below can be read as "2 Rx terminal."

[0067] (2.1) Cell selection criterion S1 In the cell selection criterion S1, the terminal 10 is Q rxlevmin Derive Srxlev based on and / or Q for single Rx terminals qualmin Derive Squal based on.

[0068] Specifically, the terminal 10 may select a Q for a single Rx terminal in a particular cell. rxlevmin Information regarding rxlevmin,SingleRx "information") and / or Q for single Rx terminals in that particular cell qualmin Information regarding qualmin,SingleRx Q rxlevmin,SingleRx The information is restated as minimum receive level information for single Rx terminals, and Q qualmin,SingleRx The information may be restated as minimum quality level information regarding the minimum quality level for a single Rx terminal. rxlevmin,SingleRx Information and / or Q qualmin,SingleRx The information may be included in the system information. For example, rxlevmin,SingleRx Information and / or Q qualmin,SingleRx The information may be included in at least one of SIB1, SIB2 and SIB4.

[0069] Terminal 10 is Q rxlevmin,SingleRxQ for single Rx terminal based on information rxlevmin Derive and Q qualmin,SingleRx Q for single Rx terminal based on information qualmin The terminal 10 derives the Q rxlevmin and the measured Q in that particular cell. rxlevmeas Srxlev and / or Q for the single Rx terminal qualmin and the measured Q in that particular cell. qualmeas The cell selection / reselection may be controlled based on Squal, which is derived based on the above.

[0070] In addition, the Q for single Rx terminals rxlevmin and Q qualmin is the Q for a terminal with more than a certain number of antennas (e.g., a single or two receive antennas). rxlevmin and Q qualmin This allows the Q measured at a single Rx terminal to be rxlevmeas and Q qualmeas is the Q measured on a device with a large number of antennas. rxlevmeas and Q qualmeas Since the cell selection criterion S1 is easily satisfied even if the cell number is smaller than 1, the coverage of a single Rx terminal can be expanded.

[0071] FIG. 5 is a diagram showing an example of the cell selection criterion S1 according to the present embodiment. For example, the terminal 10 in FIG. 5 is a single Rx terminal. As shown in FIG. 5, Srxlev in the cell selection criterion S1 is Q for a single Rx terminal. rxlevmin In addition, Q rxlevmeas , Q rxlevminoffset , P compensation and Qoffset temp Squal may be derived based on at least one of the following: qualmin In addition, Q qualmeas , Q qualminoffset and Qoffset tempIn Fig. 5, an equation of the cell selection criterion S1 is illustrated, but it is merely an example and is not limited to the one illustrated. For example, if Srxlev and / or Squal of the cell selection criterion S1 are larger than (or equal to or larger than) a predetermined value, the predetermined value is not limited to 0.

[0072] Q in cell selection criterion S1 rxlevmin is a parameter Q that is different from the parameters used in the cell selection criterion S (e.g., “q-RxLevMin” or “q-RxLevMinSUL”). rxlevmin,SingleRx For example, as shown in FIG. 5, the terminal 10 is a single Rx terminal and has Q in SIB1, SIB2, and SIB4. rxlevmin,SingleRx If the information is included and both the RedCap access information and the single Rx access information in SIB1 indicate access permission for a particular cell (e.g., are set to true), then Q rxlevmin Q rxlevmin,SingleRx It may be derived based on information (e.g., "q-RxLevMinSingleRx").

[0073] In addition, Q in cell selection criterion S1 qualmin is a parameter Q that is different from the parameter used in the cell selection criterion S (e.g., “q-QualMin”). qualmin,SingleRx For example, as shown in FIG. 5, the terminal 10 is a single Rx terminal and has Q in SIB1, SIB2, and SIB4. qualmin,SingleRx If the information is included and both the RedCap access information and the single Rx access information in SIB1 indicate access permission for a particular cell (e.g., are set to true), then Q qualmin Q qualmin,SingleRx It may be derived based on information (e.g., "q-QualMinSingleRx").

[0074] In addition, when using the above cell selection criterion S1 for a 2Rx terminal, the above Q rxlevmin,SingleRx The information is "Q for 2Rx terminals in a particular cell rxlevminInformation regarding rxlevmin,TwoRx In addition, Q qualmin,SingleRx The information is "Q for 2Rx terminals in a particular cell qualmin Information regarding qualmin,TwoRx Q rxlevmin,SingleRx An example of information is "q-RxLevMinSingleRx". rxlevmin,TwoRx It should be read as "RxLevMinTwoRx", which is an example of information. qualmin,SingleRx An example of information, "q-QualMinSingleRx", is qualmin,TwoRx The "single Rx access information" may be read as "two Rx access information."

[0075] 6 to 8 are diagrams showing an example of a specification change regarding the cell selection criterion S1 according to the present embodiment. For example, in FIG. 6, information regarding cell selection in SIB1 (for example, "cellSelectionInfo") includes Q rxlevmin,SingleRx Information (e.g., "q-RxLevMinSingleRx"), Q qualmin,SingleRx Information (e.g., "q-QualMinSingleRx"), Q rxlevmin,TwoRx Information (e.g., "RxLevMinTwoRx") and Q qualmin,TwoRx Information (e.g., "q-QualMinTwoRx") is specified. rxlevmin,SingleRx Information and Q qualmin,SingleRx Information or Q rxlevmin,TwoRx Information and Q qualmin,TwoRx The information is the Q of the cell selection criterion S1 at the time of cell selection. rxlevmin and Q qualmin In addition, when the terminal 10 is a single Rx terminal, the Q rxlevmin,SingleRx Information and Q qualmin,SingleRx If the information is not included in SIB1, then each Q is calculated based on existing parameters in SIB1 (e.g., "q-RxLevMin" and "q-QualMin"). rxlevmin and Q qualmin Derive and Q rxlevmin and Q qualminIn addition, when the terminal 10 is a 2Rx terminal, the cell selection may be controlled based on the existing cell selection criteria S based on the Q rxlevmin,TwoRx Information and Q qualmin,TwoRx If the information is not included in SIB1, then each Q is calculated based on existing parameters in SIB1 (e.g., "q-RxLevMin" and "q-QualMin"). rxlevmin and Q qualmin Derive and Q rxlevmin and Q qualmin The cell selection may be controlled based on an existing cell selection criterion S based on:

[0076] Also, Q rxlevmin,SingleRx Information and Q qualmin,SingleRx Information, Q rxlevmin,TwoRx Information and Q qualmin,TwoRx At least one of the information and information related to cell selection including the information (e.g., "cellSelectionInfo") may be conditional presence. rxlevmin,SingleRx Information and Q qualmin,SingleRx The information is included in SIB1 when the single Rx access information indicates permission for access of the single Rx terminal (for example, when it is set to true in FIG. 6), and may not be included in SIB1 in other cases. rxlevmin,TwoRx Information and Q qualmin,TwoRx The information is included in SIB1 when the 2Rx access information indicates permission for access of the 2Rx terminal (for example, when it is set to true in FIG. 6), and may not be included in SIB1 in other cases. Also, the information regarding cell selection is included in SIB1 when the RedCap access information indicates permission for access of the RedCap terminal (for example, when it is set to true in FIG. 6), and may not be included in SIB1 in other cases.

[0077] In FIG. 7, the information on intra-frequency cell reselection in SIB2 (e.g., “intraFreqCellReselectionInfo”) includes Q rxlevmin,SingleRx Information (e.g., "q-RxLevMinSingleRx"), Q qualmin,SingleRx Information (e.g., "q-QualMinSingleRx"), Qrxlevmin,TwoRx Information (e.g., "RxLevMinTwoRx") and Q qualmin,TwoRx Information (e.g., "q-QualMinTwoRx") is specified. rxlevmin,SingleRx Information and Q qualmin,SingleRx Information or Q rxlevmin,TwoRx Information and Q qualmin,TwoRx The information is the Q of cell selection criterion S1 during intra-frequency cell reselection. rxlevmin and Q qualmin In addition, when the terminal 10 is a single Rx terminal, the Q rxlevmin,SingleRx Information and Q qualmin,SingleRx If the information is not included in SIB2, then the Q value is determined based on the existing parameters in SIB2 (e.g., q-RxLevMin and q-QualMin in intraFreqCellReselectionInfo). rxlevmin and Q qualmin Derive and Q rxlevmin and Q qualmin In addition, when the terminal 10 is a 2Rx terminal, the cell reselection may be controlled based on the existing cell selection criteria S based on the Q rxlevmin,TwoRx Information and Q qualmin,TwoRx If the information is not included in SIB2, then the Q value is determined based on the existing parameters in SIB2 (e.g., q-RxLevMin and q-QualMin in intraFreqCellReselectionInfo). rxlevmin and Q qualmin Derive and Q rxlevmin and Q qualmin The cell reselection may be controlled based on an existing cell selection criterion S based on:

[0078] In FIG. 8, the information on each inter-frequency (e.g., “InterFreqNeighCellInfo”) in the list of information on the inter-frequency (e.g., “interFreqCarrierFreqList”) in SIB4 is Q rxlevmin,SingleRx Information (e.g., "q-RxLevMinSingleRx"), Q qualmin,SingleRx Information (e.g., "q-QualMinSingleRx"), Q rxlevmin,TwoRxInformation (e.g., "RxLevMinTwoRx") and Q qualmin,TwoRx Information (e.g., "q-QualMinTwoRx") is specified. rxlevmin,SingleRx Information and Q qualmin,SingleRx Information or Q rxlevmin,TwoRx Information and Q qualmin,TwoRx The information is the Q of cell selection criterion S1 during inter-frequency cell reselection. rxlevmin and Q qualmin In addition, when the terminal 10 is a single Rx terminal, the Q rxlevmin,SingleRx Information and Q qualmin,SingleRx If the information is not included in SIB4, then each Q is determined based on existing parameters in SIB4 (e.g., "q-RxLevMin" and "q-QualMin" in "InterFreqCarrierFreqInfo"). rxlevmin and Q qualmin Derive and Q rxlevmin and Q qualmin In addition, when the terminal 10 is a 2Rx terminal, the cell reselection may be controlled based on the existing cell selection criteria S based on the Q rxlevmin,TwoRx Information and Q qualmin,TwoRx If the information is not included in SIB4, then each Q is determined based on existing parameters in SIB4 (e.g., "q-RxLevMin" and "q-QualMin" in "InterFreqCarrierFreqInfo"). rxlevmin and Q qualmin Derive and Q rxlevmin and Q qualmin The cell reselection may be controlled based on an existing cell selection criterion S based on:

[0079] As described above, according to the cell selection criterion S1, Q for single Rx terminal or 2 Rx terminal rxlevmin Srxlev is derived based on and / or Q for single Rx terminal or 2 Rx terminal qualmin Since Squal is derived based on rxlevmeas and Q qualminThis makes it possible to expand the range in which single-Rx terminals or 2-Rx terminals, which are expected to have a smaller measured value of than the terminal with a large number of antennas, satisfy the cell selection criterion S1. Therefore, the coverage for single-Rx terminals or 2-Rx terminals can be expanded.

[0080] (2.2) Cell selection criterion S2 In the cell selection criterion S2, the terminal 10 selects Q rxlevmin offset for single Rx terminal or 2 Rx terminal (hereinafter referred to as "Q rxlevminoffset,Rx ") and / or derive Q in a particular cell. qualmin offset for single Rx terminal or 2 Rx terminal (hereinafter referred to as "Q qualminoffset,Rx " Squal is derived based on the

[0081] Specifically, the terminal 10 is rxlevmin Information regarding rxlevmin "information") and / or Q qualmin Information regarding qualmin Q rxlevmin The information is restated as minimum reception level information regarding the minimum reception level, and Q qualmin The information may be restated as minimum quality level information regarding the minimum quality level.

[0082] Also, Q rxlevmin Information and / or Q qualmin The information may be included in the system information. For example, rxlevmin Information and / or Q qualmin The information may be included in at least one of SIB1, SIB2, and SIB4. rxlevmin Informed Q rxlevmin The terminal 10 also derives Q qualmin Informed Q qualmin Derive the following. Note that the Q rxlevmin and Q qualmin may be common among single Rx terminals or 2 Rx terminals and terminals with a large number of antennas.

[0083] Terminal 10 is Q rxlevmin , Q rxlevmin Q for single Rx terminal or 2 Rx terminal rxlevminoffset,Rx and the measured Q in a particular cell rxlevmeas Srxlev and / or Q derived based on qualmin , Q qualmin Q for single Rx terminal or 2 Rx terminal qualminoffset,Rx and the measured Q in a particular cell qualmeas Cell selection / reselection may be controlled based on Squal, which is derived based on

[0084] FIG. 9 is a diagram showing an example of the cell selection criterion S2 according to the present embodiment. For example, the terminal 10 in FIG. 9 is a single Rx terminal. As shown in FIG. 9, Srxlev of the cell selection criterion S2 is Q rxlevmin , Q rxlevmeas , Q rxlevminoffset , Q rxlevminoffset,Rx , P compensation and Qoffset temp Squal may be derived based on at least one of Q qualmin , Q qualmeas , Q qualminoffset , Q qualminoffset,Rx and Qoffset temp In Fig. 9, an equation of the cell selection criterion S2 is illustrated, but it is merely an example and is not limited to the one illustrated. For example, if Srxlev and / or Squal of the cell selection criterion S2 are larger than (or equal to or larger than) a predetermined value, the predetermined value is not limited to 0.

[0085] Q in cell selection criterion S2 rxlevminoffset,Rx and / or Q qualminoffset,Rx may be a predetermined value (e.g., a value defined in a specification). Alternatively, the terminal 10 may rxlevminoffset,Rx Information regarding rxlevminoffset,Rx Receive the received Q rxlevminoffset,Rx Informed Q rxlevminoffset,Rx The terminal 10 may also derive Q qualminoffset,RxInformation regarding qualminoffset,Rx Receive the received Q qualminoffset,Rx Informed Q qualminoffset,Rx may be derived.

[0086] Q rxlevminoffset,Rx For information, please contact Q rxlevmin This can be rephrased as information about the offset for Q qualminoffset,Rx For information, please contact Q qualmin This can be rephrased as information about the offset for the Q rxlevminoffset,Rx Information and / or Q qualminoffset,Rx The information may be included in the system information. For example, rxlevminoffset,Rx Information and / or Q qualminoffset,Rx The information may be included in at least one of SIB1, SIB2, and SIB4.

[0087] Also, Q rxlevminoffset,Rx For information, please contact Q rxlevmin Information on the offset for single Rx terminals for rxlevminoffset,SingleRx Information" (e.g., "q-RxLevMinOffsetSingleRx") and / or Q rxlevmin Information on the offset for 2Rx terminals for rxlevminoffset,TwoRx Information such as "q-RxLevMinOffsetTwoRx" may also be included. rxlevminoffset,Rx For information, please contact Q qualmin Information on the offset for single Rx terminals for qualminoffset,SingleRx Information" (e.g., "q-RxLevMinOffsetSingleRx") and / or Q qualmin Information on the offset for 2Rx terminals for qualminoffset,TwoRx Information" such as "q-RxLevMinOffsetTwoRx").

[0088] In cell selection criterion S2, Q for single Rx terminal or 2 Rx terminal is rxlevminoffset,Rx and / or Q qualminoffset,Rx Since Q rxlevmeas and Q qualmeasThis makes it possible to expand the range in which single-Rx terminals or 2-Rx terminals, which are expected to have a smaller measured value of than the terminal with a large number of antennas, satisfy the cell selection criterion S2. Therefore, the coverage for single-Rx terminals or 2-Rx terminals can be expanded.

[0089] 10 to 12 are diagrams showing an example of a specification change regarding the cell selection criterion S2 according to the present embodiment. For example, in FIG. 10, information regarding cell selection in SIB1 (for example, "cellSelectionInfo") includes Q rxlevminoffset,SingleRx Information (e.g., "q-RxLevMinOffsetSingleRx"), Q qualminoffset,SingleRx Information (e.g., "q-QualMinOffsetSingleRx"), Q rxlevminoffset,TwoRx Information (e.g., "q-RxLevMinOffsetTwoRx") and Q qualminoffset,TwoRx Information (e.g., "q-QualMinOffsetTwoRx") is specified. rxlevminoffset,SingleRx Information and Q qualminoffset,SingleRx Information or Q rxlevminoffset,TwoRx Information and Q qualminoffset,TwoRx The information is the Q of the cell selection criterion S2 at the time of cell selection. rxlevmin and Q qualmin In addition, when the terminal 10 is a single Rx terminal, the Q rxlevminoffset,SingleRx Information and Q qualminoffset,SingleRx If the information is not included in SIB1, the terminal 10 does not use Q in the cell selection criterion S2. rxlevminoffset,Rx and Q qualminoffset,Rx A default value (e.g., 0 (zero)) may be applied to Q. rxlevminoffset,TwoRx Information and Q qualminoffset,TwoRx If the information is not included in SIB1, terminal 10 rxlevminoffset,Rx and Q qualminoffset,Rx A default value (e.g., 0 (zero)) may be applied to

[0090] Also, Q rxlevminoffset,SingleRx Information and Q qualminoffset,SingleRx Information, Q rxlevminoffset,TwoRx Information and Q qualminoffset,TwoRxAt least one of the information and information related to cell selection including the information (e.g., "cellSelectionInfo") may be conditional presence. rxlevminoffset,SingleRx Information and Q qualminoffset,SingleRx The information is included in SIB1 when the single Rx access information indicates permission for access of the single Rx terminal (for example, when it is set to true in FIG. 10), and may not be included in SIB1 in other cases. rxlevminoffset,TwoRx Information and Q qualminoffset,TwoRx The information is included in SIB1 when the 2Rx access information indicates permission for access of the 2Rx terminal (for example, when set to true in FIG. 10), and may not be included in SIB1 in other cases. Also, the information regarding cell selection is included in SIB1 when the RedCap access information indicates permission for access of the RedCap terminal (for example, when set to true in FIG. 10), and may not be included in SIB1 in other cases.

[0091] In FIG. 11, the information on intra-frequency cell reselection in SIB2 (e.g., “intraFreqCellReselectionInfo”) includes Q rxlevminoffset,SingleRx Information (e.g., "q-RxLevMinOffsetSingleRx"), Q qualminoffset,SingleRx Information (e.g., "q-QualMinOffsetSingleRx"), Q rxlevminoffset,TwoRx Information (e.g., "q-RxLevMinOffsetTwoRx") and Q qualminoffset,TwoRx Information (e.g., "q-QualMinOffsetTwoRx") is specified. Q rxlevminoffset,SingleRx Information and Q qualminoffset,SingleRx Information or Q rxlevminoffset,TwoRx Information and Q qualminoffset,TwoRx The information is the Q of cell selection criterion S2 during intra-frequency cell reselection. rxlevmin and Q qualmin In addition, when the terminal 10 is a single Rx terminal, Q rxlevminoffset,SingleRx Information and Q qualminoffset,SingleRx If the information is not included in SIB2, the terminal 10 does not use Q in the cell selection criterion S2.rxlevminoffset,Rx and Q qualminoffset,Rx A default value (e.g., 0 (zero)) may be applied to Q. rxlevminoffset,TwoRx Information and Q qualminoffset,TwoRx If the information is not included in SIB2, terminal 10 rxlevminoffset,Rx and Q qualminoffset,Rx A default value (e.g., 0 (zero)) may be applied to

[0092] In FIG. 12, the information on each inter-frequency (e.g., “InterFreqNeighCellInfo”) in the list of information on the inter-frequency (e.g., “interFreqCarrierFreqList”) in SIB4 is Q rxlevminoffset,SingleRx Information (e.g., "q-RxLevMinOffsetSingleRx"), Q qualminoffset,SingleRx Information (e.g., "q-QualMinOffsetSingleRx"), Q rxlevminoffset,TwoRx Information (e.g., "q-RxLevMinOffsetTwoRx") and Q qualminoffset,TwoRx Information (e.g., "q-QualMinOffsetTwoRx") is specified. Q rxlevminoffset,SingleRx Information and Q qualminoffset,SingleRx Information or Q rxlevminoffset,TwoRx Information and Q qualminoffset,TwoRx The information is the Q of cell selection criterion S2 during inter-frequency cell reselection. rxlevmin and Q qualmin In addition, when the terminal 10 is a single Rx terminal, Q rxlevminoffset,SingleRx Information and / or Q qualminoffset,SingleRx If the information is not included in SIB4, the terminal 10 does not use Q in the cell selection criterion S2. rxlevminoffset,Rx and / or Q qualminoffset,Rx A default value (e.g., 0 (zero)) may be applied to Q. rxlevminoffset,TwoRx Information and / or Q qualminoffset,TwoRx If the information is not included in SIB4, terminal 10 rxlevminoffset,Rx and / or Q qualminoffset,Rx A default value (e.g., 0 (zero)) may be applied to

[0093] As described above, according to the cell selection criterion S2, Q for single Rx terminal or 2 Rx terminal rxlevminoffset,Rx Srxlev is derived based on and / or Q for single Rx terminal or 2 Rx terminal qualminoffset,Rx Since Squal is derived based on rxlevmeas and Q qualmin This makes it possible to expand the range in which single-Rx terminals or 2-Rx terminals, which are expected to have a smaller measured value of than the terminal with a large number of antennas, satisfy the cell selection criterion S2. Therefore, the coverage for single-Rx terminals or 2-Rx terminals can be expanded.

[0094] In addition, the cell selection criteria S1 and S2 may be combined. Specifically, the Q for single-Rx terminals or 2-Rx terminals in the cell selection criteria S1 rxlevmin and Q for single Rx terminal or 2 Rx terminal in cell selection criterion S2 rxlevminoffset,Rx In addition, Q for a single Rx terminal or a two Rx terminal in cell selection criterion S1 may be derived based on qualmin and Q for single Rx terminal or 2 Rx terminal in cell selection criterion S2 qualminoffset,Rx Squal may be derived based on

[0095] As described above, when allowing access to at least one specific cell for a RedCap terminal, a single Rx terminal, and a 2Rx terminal, by using cell selection criteria S1 and / or S2, it is possible to prevent degeneration of coverage for at least one of the RedCap terminal, the single Rx terminal, and the 2Rx terminal, and to appropriately control cell selection / reselection.

[0096] In addition, in the above cell selection criterion S1, Q for single Rx terminal or 2 Rx terminal is rxlevmin and Q qualmin I explained about the Q for RedCap terminal. rxlevmin and Q qualmin Similarly, in the above cell selection criterion S2, the Q rxlevminoffset,Rxand Q qualminoffset,Rx I explained about the Q for RedCap terminal. rxlevminoffset and Q qualminoffset Of course, the present invention can also be applied to the above.

[0097] In addition, the above (1) case of access prohibition and (2) case of access permission may be combined. For example, when access to a specific cell is prohibited and access to a cell having the same and / or different carrier frequency as the specific cell is permitted, the terminal 10 may control reselection of the cell based on the above cell selection criteria S1 and / or S2.

[0098] (Configuration of wireless communication system) Next, a description will be given of the configuration of each device of the above-described wireless communication system 1. Note that the following configuration is intended to show the configuration required in the description of this embodiment, and does not exclude each device from having a functional block other than that shown in the figure.

[0099] <Hardware configuration> 13 is a diagram showing an example of a hardware configuration of each device in the wireless communication system according to the present embodiment. Each device (e.g., a terminal 10, a base station 20, a CN 30, etc.) in the wireless communication system 1 includes a processor 11, a storage device 12, a communication device 13 that performs wired or wireless communication, and an input device that accepts various input operations and an input / output device 14 that outputs various information.

[0100] The processor 11 is, for example, a CPU (Central Processing Unit) and controls each device in the wireless communication system 1. The processor 11 may execute various processes described in the present embodiment by reading and executing a program from the storage device 12. Each device in the wireless communication system 1 may be configured with one or more processors 11. Furthermore, each of the devices may be called a computer.

[0101] The storage device 12 is configured with, for example, storage such as a memory, a hard disk drive (HDD) and / or a solid state drive (SSD), etc. The storage device 12 may store various information necessary for the processor 11 to execute processing (for example, a program executed by the processor 11, etc.).

[0102] The communication device 13 is a device that communicates via a wired and / or wireless network, and may include, for example, a network card, a communication module, a chip, an antenna, etc. The communication device 13 may also include an amplifier, an RF (Radio Frequency) device that performs processing related to wireless signals, and a BB (BaseBand) device that performs baseband signal processing.

[0103] The RF device performs, for example, D / A conversion, modulation, frequency conversion, power amplification, etc. on the digital baseband signal received from the BB device to generate a radio signal to be transmitted from the antenna A. The RF device also performs frequency conversion, demodulation, A / D conversion, etc. on the radio signal received from the antenna to generate a digital baseband signal and transmit it to the BB device. The BB device performs a process of converting the digital baseband signal into a packet, and a process of converting the packet into a digital baseband signal.

[0104] The input / output device 14 includes, for example, input devices such as a keyboard, a touch panel, a mouse, and / or a microphone, and output devices such as a display and / or a speaker.

[0105] The hardware configuration described above is merely an example. Each device in the wireless communication system 1 may omit some of the hardware shown in Fig. 13, or may include hardware not shown in Fig. 13. Furthermore, the hardware shown in Fig. 13 may be configured by one or more chips.

[0106] <Function block configuration> <Device> 14 is a diagram showing an example of a functional block configuration of a terminal according to this embodiment. As shown in FIG. 14, the terminal 10 includes a receiving unit 101, a transmitting unit 102, and a control unit 103.

[0107] All or part of the functions realized by the receiving unit 101 and the transmitting unit 102 can be realized by using the communication device 13. All or part of the functions realized by the receiving unit 101 and the transmitting unit 102 and the control unit 103 can be realized by the processor 11 executing a program stored in the storage device 12. The program can be stored in a storage medium. The storage medium storing the program may be a non-transitory computer readable medium. The non-transitory storage medium is not particularly limited, and may be, for example, a storage medium such as a USB memory or a CD-ROM.

[0108] The receiving unit 101 receives a downlink signal. The receiving unit 101 may also receive information and / or data transmitted via the downlink signal. Here, "receive" may include performing at least one of reception-related processes such as reception, demapping, demodulation, decoding, monitoring, and measurement of a radio signal. The downlink signal may include at least one of a PDSCH, a PDCCH, a downlink reference signal, a synchronization signal, a PBCH, and the like.

[0109] The receiver 101 monitors PDCCH candidates in a search space to detect DCI. The receiver 101 may receive downlink user data and / or higher layer control information (e.g., Medium Access Control Element (MAC CE), Radio Resource Control (RRC) message, etc.) via a PDSCH scheduled using DCI.

[0110] Specifically, the receiving unit 101 may receive system information (eg, SIB1, SIB2, or SIB4).

[0111] The receiver 101 also calculates a Q for a terminal 10 (e.g., a single Rx terminal and / or a two Rx terminal) having a specific number of antennas in a specific cell. rxlevmin Minimum reception level information (e.g., Q rxlevmin,SingleRx Information and / or Q rxlevmin,TwoRx information), and / or Q for the terminal with the particular number of antennas in the particular cell qualmin (Minimum quality level) minimum quality level information (e.g., Q qualmin,SingleRx Information and / or Q qualmin,TwoRx Information) may be received (eg, FIGS. 6 to 8).

[0112] In addition, the receiving unit 101 receives Q rxlevmin Minimum reception level information (e.g., Q rxlevmin information) and / or Q in a particular cell qualmin (Minimum quality level) minimum quality level information (e.g., Q qualmin Information) may be received (for example, FIGS. 6 to 8, 10 to 12).

[0113] In addition, the receiving unit 101 rxlevmin Q is the offset for a terminal 10 with a particular number of antennas (e.g., a single Rx terminal and / or a two Rx terminal) relative to rxlevminoffset,Rx Information about (e.g., Q rxlevminoffset,SingleRx Information and / or Q rxlevminoffset,TwoRx Information), and / or Q qualmin Q is the offset for the terminal 10 with the specific number of antennas qualminoffset,Rx Information about (e.g., Q qualminoffset,SingleRx Information and / or Q qualminoffset,TwoRx Information) may be received (eg, FIGS. 10 to 12).

[0114] The transmitting unit 102 transmits an uplink signal. The transmitting unit 102 may also transmit information and / or data transmitted via the uplink signal. Here, "transmitting" may include performing processing related to transmission, such as at least one of encoding, modulation, mapping, and transmission of a radio signal. The uplink signal may include at least one of an uplink shared channel (e.g., a Physical Uplink Shared channel (PUSCH)), a random access preamble (e.g., a Physical Random Access Channel (PRACH)), an uplink reference signal, etc.

[0115] The transmitting unit 102 may transmit uplink user data and / or higher layer control information (for example, MAC CE, RRC message, etc.) via a PUSCH scheduled using the DCI received by the receiving unit 101.

[0116] The control unit 103 performs various controls in the terminal 10. Specifically, the control unit 103 controls access of a terminal 10 of a specific type (e.g., a RedCap terminal) and / or a terminal 10 with a specific number of antennas (e.g., a single Rx terminal and / or a 2 Rx terminal) to a specific cell. In addition, the control unit 103 controls cell selection / reselection of the terminal 10 of the specific type and / or the terminal 10 with the specific number of antennas.

[0117] In addition, the control unit 103 may determine whether access to a specific cell is prohibited based on first access information (e.g., RedCap access information) regarding access of a specific type of terminal 10 and / or second access information (e.g., single Rx access information and / or 2 Rx access information) regarding access of a terminal 10 with a specific number of antennas.

[0118] In addition, the control unit 103 may determine whether access to a specific cell is prohibited based on whether the system information received by the receiving unit 101 includes the first access information (e.g., RedCap access information) and / or whether the system information includes the second access information (e.g., single Rx access information and / or 2 Rx access information) (e.g., Figure 3).

[0119] In addition, the control unit 103 may determine whether access to a particular cell is prohibited based on whether the terminal 10 is a terminal 10 of a particular type (e.g., a RedCap terminal) and / or whether the terminal 10 is a terminal 10 with a particular number of antennas (e.g., a single Rx terminal and / or a 2 Rx terminal) (e.g., FIG. 3).

[0120] In addition, the control unit 103 may determine that the terminal 10 is prohibited from accessing a particular cell when the terminal 10 is a particular type of terminal 10 (e.g., a RedCap terminal) and the above-mentioned first access information (e.g., RedCap access information) is not included in the system information (e.g., FIG. 3).

[0121] In addition, when the terminal 10 is a terminal 10 of a specific type (e.g., a RedCap terminal) and the above-mentioned first access information (e.g., RedCap access information) is included in the system information, the control unit 103 may determine whether access to a specific cell is prohibited based on whether the terminal 10 is a terminal 10 with a specific number of antennas (e.g., a single Rx access terminal or a 2 Rx terminal) and whether the above-mentioned second access information (e.g., single Rx access information) is included in the system information (e.g., FIG. 3).

[0122] For example, when the terminal 10 is a RedCap terminal, and the system information includes RedCap access information, and when the terminal 10 is a single Rx access terminal, and the system information does not include the single Rx access information, the control unit 103 may determine that the terminal 10 is prohibited from accessing a specific cell (for example, FIG. 3). On the other hand, when the terminal 10 is a single Rx access terminal and the system information includes the single Rx access information, the control unit 103 may evaluate the specific cell based on a predetermined criterion and camp on the specific cell based on the evaluation result.

[0123] In addition, the control unit 103 may generate minimum reception level information (e.g., Q rxlevmin,SingleRx Information or Q rxlevmin,TwoRx information) and / or minimum quality level information (e.g., Q qualmin,SingleRx Information or Q qualmin,TwoRx The method controls cell selection and / or cell reselection based on Squal (a quality level parameter), which is derived based on the received information (eg, FIG. 5).

[0124] In addition, when the terminal 10 is a terminal 10 with a specific number of antennas (for example, a single Rx terminal or a 2 Rx terminal), the control unit 103 may set the minimum reception level information (for example, Q rxlevmin,SingleRx Information or Q rxlevmin,TwoRx information) for the terminal 10 with the particular number of antennas, and / or derive Srxlev based on the minimum quality level information (e.g., Q qualmin,SingleRx Information or Q qualmin,TwoRx The control unit 103 may derive Squal based on the received signal (e.g., FIG. 5). In this manner, the control unit 103 may derive Srxlev and / or Squal based on whether the terminal 10 itself has a specific number of antennas.

[0125] In addition, when a terminal 10 of a specific type (e.g., a RedCap terminal) is permitted to access a specific cell, and / or when a terminal 10 of a specific number of antennas (e.g., a single Rx terminal or a 2 Rx terminal) is permitted to access the specific cell, the control unit 103 may obtain minimum reception level information (e.g., Q rxlevmin,SingleRx Information or Q rxlevmin,TwoRx information) for the terminal 10 with the particular number of antennas, and / or derive Srxlev based on the minimum quality level information (e.g., Q qualmin,SingleRx Information or Q qualmin,TwoRx The Squal may be derived based on the following information (eg, FIG. 5).

[0126] In addition, the control unit 103 rxlevmin Informed Q rxlevmin And, Q rxlevmin Q is the offset for terminal 10 with a particular number of antennas rxlevminoffset,Rx and Srxlev and / or Q derived based on qualmin Informed Q qualmin And, Q qualmin Q is the offset for terminal 10 with a particular number of antennas qualminoffset,Rx The cell selection and / or cell reselection may be controlled based on Squal, which is derived based on and (eg, FIG. 9).

[0127] Q in question rxlevminoffset,Rx and / or Q qualminoffset,Rx is a predetermined value Alternatively, the control unit 103 may Q rxlevminoffset,Rx Informed Q rxlevminoffset,Rx Derive and Q qualminoffset,Rx Informed Q qualminoffset,Rx Derive You may do so.

[0128] ≪Base station≫ 15 is a diagram showing an example of a functional block configuration of a base station according to this embodiment. As shown in FIG. 15, the base station 20 includes a receiving unit 201, a transmitting unit 202, and a control unit 203.

[0129] All or part of the functions realized by the receiving unit 201 and the transmitting unit 202 can be realized by using the communication device 13. All or part of the functions realized by the receiving unit 201 and the transmitting unit 202 and the control unit 203 can be realized by the processor 11 executing a program stored in the storage device 12. The program can be stored in a storage medium. The storage medium storing the program may be a computer-readable non-transitory storage medium. The non-transitory storage medium is not particularly limited, and may be, for example, a storage medium such as a USB memory or a CD-ROM.

[0130] The receiving unit 201 receives the upstream signal. The receiving unit 201 may also receive information and / or data transmitted via the upstream signal.

[0131] The transmitting unit 202 transmits the downlink signal. The transmitting unit 202 may also transmit information and / or data to be transmitted via the downlink signal. Specifically, the transmitting unit 202 may transmit system information (e.g., SIB1, SIB2, or SIB4). The transmitting unit 202 may also transmit minimum reception level information (e.g., Q rxlevmin,SingleRx Information and / or Q rxlevmin,TwoRx information) and minimum quality level information (e.g., Q qualmin,SingleRx Information and / or Q qualmin,TwoRx The transmitting unit 202 may transmit the above Q rxlevmin Information and / or Q qualmin The transmitting unit 202 may transmit information (for example, FIGS. 6 to 8, 10 to 12). rxlevminoffset,Rx Information and / or Q qualminoffset,Rx Information may be transmitted (eg, FIGS. 10 to 12).

[0132] The control unit 203 performs various controls in the base station 20. The control unit 203 controls access of a specific type of terminal 10 and / or a terminal 10 with a specific number of antennas to a specific cell. The control unit 203 also controls cell selection / reselection of a specific type of terminal 10 and / or a terminal 10 with a specific number of antennas.

[0133] (Other embodiments) Various signals, information, and parameters in the above embodiments may be signaled in any layer. That is, the above various signals, information, and parameters may be replaced with signals, information, and parameters of any layer, such as an upper layer (e.g., a Non Access Stratum (NAS) layer, an RRC layer, a MAC layer, etc.) or a lower layer (e.g., a physical layer). In addition, notification of predetermined information is not limited to being explicitly performed, and may be performed implicitly (e.g., by not notifying information or by using other information).

[0134] In addition, the names of various signals, information, parameters, IEs, channels, time units, and frequency units in the above embodiments are merely examples and may be replaced with other names. For example, a slot may be any name as long as it is a time unit having a predetermined number of symbols. Also, an RB may be any name as long as it is a frequency unit having a predetermined number of subcarriers.

[0135] In addition, the applications of the terminal 10 in the above embodiments (e.g., RedCap, IoT, etc.) are not limited to those exemplified, and as long as it has similar functions, it may be used for any application (e.g., eMBB, URLLC, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.). In addition, the format of various information is not limited to the above embodiments, and may be changed as appropriate to bit representation (0 or 1), boolean value (Boolean: true or false), integer value, character, etc. In addition, singular and plural in the above embodiments may be changed mutually.

[0136] The above-described embodiments are intended to facilitate understanding of the present disclosure, and are not intended to limit the present disclosure. The flowcharts, sequences, elements included in the embodiments, and their arrangements, indexes, conditions, etc. described in the embodiments are not limited to those exemplified, and can be changed as appropriate. In addition, at least some of the configurations described in the above embodiments can be partially replaced or combined.

[0137] In Fig. 5, when the terminal 10 is a single Rx terminal, the Qrxlevmin, SingleRx information is included in SIB1, SIB2, and SIB4, and both the RedCap access information and the single Rx access information in SIB1 indicate access permission to a specific cell (for example, set to true), the Qrxlevmin is derived based on the Qrxlevmin, SingleRx information (for example, "q-RxLevMinSingleRx"). However, this is not limited. When the terminal 10 is determined to be permitted to access a cell based on the RedCap access information and / or the single Rx access information in SIB1 (i.e., the cell is not prohibited for the terminal 10), the Qrxlevmin may be derived based on the Qrxlevmin, SingleRx information (for example, "q-RxLevMinSingleRx").

[0138] Also, in FIG. 5, the terminal 10 is a single Rx terminal and has Q in SIB1, SIB2, and SIB4. qualmin,SingleRx If the information is included and both the RedCap access information and the single Rx access information in SIB1 indicate access permission for a particular cell (e.g., are set to true), then Q qualmin Q qualmin,SingleRx In the above description, the Q-QualMinSingleRx information (e.g., “q-QualMinSingleRx”) is derived based on the UE 10. If the UE 10 determines that access to the cell is permitted (i.e., the cell is not prohibited for the UE 10) based on the RedCap access information and / or the single Rx access information in the SIB1, the Q-QualMinSingleRx information is derived based on the UE 10.qualmin Q qualmin,SingleRx It may be derived based on information (e.g., "q-QualMinSingleRx").

Claims

1. a receiver for receiving system information in a cell; A control unit that, when information indicating whether the cell is barred for a terminal having a specific number of receivers is included in the system information, determines whether the cell is barred based on whether the terminal is a terminal having the specific number of receivers; The control unit controls at least one of cell selection or cell reselection based on a reception level value derived based on information indicating a minimum reception level in the cell included in the system information and a value for the minimum reception level for a terminal equipped with the specific number of receivers, the terminal with the particular number of receivers is a terminal with a single receiver, the value for the minimum reception level for a terminal having the particular number of receivers is a predetermined value for a terminal having a single receiver; Terminal.

2. The receiving unit receives the system information including information indicating a minimum quality level in the cell; The control unit controls at least one of the cell selection or the cell reselection based on a quality value derived based on the information indicating a minimum quality level in the cell and a value for the terminal having the specific number of receivers for the minimum quality level; the value for the minimum quality level for a terminal with the particular number of receivers is a predetermined value for a terminal with a single receiver. The terminal according to claim 1.

3. The system information is system information block 1 (SIB1); A terminal according to claim 1 or 2.

4. The terminal having the specific number of receivers is a RedCap (Reduced Capability) terminal. A terminal according to any one of claims 1 to 3.

5. a transmitter for transmitting system information in a cell; A control unit that controls whether or not the cell is prohibited for a terminal having a specific number of receivers based on information indicating whether or not the cell is prohibited for a terminal having the specific number of receivers included in the system information, The control unit controls at least one of cell selection or cell reselection based on a reception level value derived based on information indicating a minimum reception level in the cell included in the system information and a value for the minimum reception level for a terminal equipped with the specific number of receivers, the terminal with the particular number of receivers is a terminal with a single receiver, the value for the minimum reception level for a terminal having a particular number of receivers is a predetermined value for a terminal having a single receiver; Base station.

6. The transmitter transmits the system information including information indicating a minimum quality level in the cell; The control unit controls at least one of the cell selection or the cell reselection based on a quality value derived based on the information indicating a minimum quality level in the cell and a value for the terminal having the specific number of receivers for the minimum quality level; the value for the minimum quality level for a terminal with a particular number of receivers is a predetermined value for a terminal with a single receiver. The base station according to claim 5.

7. The system information is system information block 1 (SIB1); A base station as claimed in claim 5 or 6.

8. The terminal having the specific number of receivers is a RedCap (Reduced Capability) terminal. A base station according to any one of claims 5 to 7.

9. receiving system information in a cell; if the system information includes information indicating whether the cell is barred for a terminal with a specific number of receivers, determining whether the cell is barred based on whether the terminal is a terminal with the specific number of receivers; and controlling at least one of cell selection or cell reselection based on a reception level value derived based on information indicating a minimum reception level in the cell included in the system information and a value for the minimum reception level for a terminal having the specific number of receivers, the terminal with the particular number of receivers is a terminal with a single receiver, the value for the minimum reception level for a terminal having the particular number of receivers is a predetermined value for a terminal having a single receiver; The wireless communication method of the terminal.

10. receiving the system information including information indicative of a minimum quality level in the cell; and controlling at least one of the cell selection or the cell reselection based on a quality value derived based on the information indicative of a minimum quality level in the cell and a value for the minimum quality level for terminals with the particular number of receivers, the value for the minimum quality level for a terminal with the particular number of receivers is a predetermined value for a terminal with a single receiver. The wireless communication method according to claim 9.

11. The system information is system information block 1 (SIB1); 11. The wireless communication method according to claim 9 or 10.

12. The terminal having the specific number of receivers is a RedCap (Reduced Capability) terminal. A wireless communication method according to any one of claims 9 to 11.

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