Terminal, base station, and wireless communication method

Abstract

To provide a terminal and a wireless communication method that can appropriately control cell selection and / or cell re-selection.SOLUTION: In a wireless communication system, a terminal 10 comprises: a reception unit that receives lowest reception level information related to the lowest reception level for a terminal with a specific number of antennas in a specific cell, and / or lowest quality level information related to the lowest quality level for a terminal with a specific number of antennas in a specific cell; and a control unit that controls a cell selection and / or a cell re-selection on the basis of a reception level parameter that is derived on the basis of the lowest reception level information and / or a quality level parameter that is derived from the lowest quality level information.SELECTED DRAWING: Figure 14

Description

Cross - reference to related applications

[0001] This application is based on Japanese Patent Application No. 2021 - 055161 filed on March 29, 2021, claims the benefit of its priority, and all the contents of that patent application are incorporated herein by reference.

Technical Field

[0002] This disclosure relates to a terminal and a wireless communication method.

Background Art

[0003] In the Third Generation Partnership Project (3GPP), which is an international standards organization, Release 15 of New Radio (NR), which is the fifth - generation (5G) Radio Access Technology (RAT), has been standardized as a successor to Long Term Evolution (LTE), which is the 3.9 - generation RAT, and LTE - Advanced, which is the 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 for a terminal to select a cell to camp on and / or cell reselection to reselect the cell are performed.

Prior Art Documents

Non - Patent Documents

[0005]

Non - Patent Document 1

Summary of the Invention

[0006] In 3GPP (for example, Release 17 of NR), it is being considered to support a terminal for NR (hereinafter referred to as "Reduced Capability (RedCap) terminal") assuming lower performance and price range than a terminal for NR (hereinafter referred to as "existing NR terminal") introduced in Release 15 or 16. Also, it is being considered to define the RedCap terminal as a specific type of terminal. Further, it is being considered to support a terminal with a specific number of antennas reduced from a predetermined (given) number of antennas (for example, 4 or 2 receiving antennas) (for example, a terminal with a single or 2 receiving antennas).

[0007] Coverage of terminals of the above specific type and / or specific number of antennas is assumed to degenerate compared to existing NR terminals and / or terminals with a larger number of antennas than the specific number of antennas. For this reason, terminals of a specific type and / or specific number of antennas may not be able to appropriately select and / or reselect the cell to camp on in cell selection and / or cell reselection. One of the purposes 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 aspect of the present disclosure includes a receiving unit that receives minimum reception level information regarding the minimum reception level for a terminal with a specific number of antennas in a specific cell and / or minimum quality level information regarding the 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. Further, a terminal according to an aspect of the present disclosure includes a receiving unit that receives minimum reception level information regarding the minimum reception level in a specific cell and / or minimum quality level information regarding the minimum quality level in the specific cell, a reception level parameter derived based on the minimum reception level and an offset for a terminal with a specific number of antennas with respect to the minimum reception level, and / or a quality level parameter derived based on the minimum quality level and an offset for a terminal with a specific number of antennas with respect to the minimum quality level, and a control unit that controls cell selection and / or cell reselection based on the reception level parameter and / or the quality level parameter.

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

Brief Description of the Drawings

[0010]

Figure 1

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Figure 15

[0011] Embodiments of the present disclosure will be described with reference to the accompanying drawings. In each figure, those denoted by the same reference numerals may have the same or similar configurations.

[0012] FIG. 1 is a diagram showing an example of the outline of the 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 the terminal 10 and the base station 20 shown in FIG. 1 are merely illustrative and are not limited to the numbers shown.

[0013] As the radio access technology (RAT) of the wireless communication system 1, for example, NR is assumed, but it is not limited to this, and various RATs such as RATs after the 6th generation can be used.

[0014] The terminal 10 is a predetermined terminal or device such as, for example, 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 user terminal, a radio apparatus, a subscriber terminal, an access terminal, etc. The terminal 10 may be mobile or fixed. The terminal 10 is configured to be able to communicate using, for example, NR as the RAT.

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

[0016] The base station 20 may be referred to as, for example, a gNodeB (gNB), an 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 composed of a plurality of 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 corresponding to NR (5G Core Network: 5GC), but is not limited thereto. Devices on the core network 30 (hereinafter, also referred to as "core network devices") perform mobility management such as paging and location registration of the terminal 10. The core network device 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 (for example, information related to access and mobility management, etc.) and a User Plane Function (UPF) that performs transmission control of U-plane information (for example, user data).

[0019] In the wireless communication system 1, the terminal 10 receives a downlink (DL) signal from the base station 20 and / or transmits an uplink (UL) signal. One or more cells C are configured for 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, etc.

[0020] Also, the terminal 10 performs cell search based on synchronization signals from the base station 20 (e.g., Primary Synchronization Signal (PSS) and / or Secondary Synchronization Signal (SSS)). 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., Physical Layer Cell ID). A block including the above synchronization signals, a broadcast channel (e.g., Physical Broadcast Channel (PBCH)), and a demodulation reference signal (DMRS) for the broadcast channel is also called a Synchronization Signal Block (SSB), an 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 the cell is a cell in which access to the cell is prohibited (hereinafter referred to as a "barred cell") based on a parameter in the MIB (e.g., "cellBarred"). If the cell is a barred cell, the terminal 10 may reselect another cell having the same carrier frequency as the barred cell. Note that the parameter may also be called an Information Element (IE), etc.

[0022] On the one hand, when the cell is not a prohibited cell, system information block (SIB) (e.g., SIBx, x = 1, 2, …) may be obtained based on the MIB via a downlink shared channel (e.g., Physical Downlink Shared Channel: PDSCH). Specifically, the terminal 10 may determine a search space and / or a control resource set (CORESET) based on parameters (e.g., “pdcch-ConfigSIB1”) within the MIB, and monitor downlink control information (DCI) within the search space associated with the CORESET. The monitoring of the DCI is also called blind decoding, etc. The terminal 10 receives SIB1 via a PDSCH scheduled by the DCI detected within 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. The DCI of a predetermined format may be called a DCI format. For the DCI used for scheduling the PDSCH that transmits the SIB (e.g., SIB1, 2, or 4), cyclic redundancy check (CRC) bits (also referred to as CRC parity bits) scrambled by a predetermined (given) identifier (e.g., System Information radio network temporary identifier: SI-RNTI) may be added. Also, the DCI may be, for example, a downlink assignment used for scheduling the PDSCH (e.g., DCI format 1_0).

[0024] (Cell selection / reselection) When the terminal 10 is in the idle state, non-active state, or connected state with a specific timer running, it selects and / or re-selects a cell to camp on (hereinafter referred to as the "camp-on cell") based on a predetermined criterion (hereinafter referred to as the "Cell Selection Criterion"). The camp-on cell may be equivalently referred to as, for example, the "in-circuit cell", "suitable cell", "better cell", etc.

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

[0026] Also, the non-active state is a state in which the above RRC connection is established but suspended, and is also called the RRC_INACTIVE state, non-active mode, RRC non-active mode, etc. The terminal 10 in the non-active state receives the system information broadcast by the camp-on cell. When the RRC connection of the terminal 10 in the non-active state is resumed, it transitions to the connected state, and when the RRC connection is released, it transitions to the idle state.

[0027] The connected state is a state in which the above RRC connection is established, and is also called the RRC_CONNECTED state, connected mode, RRC connected mode, etc. When the RRC connection of the terminal 10 in the connected state is released, it transitions to the idle state, and when the RRC connection is suspended, it transitions to the non-active state.

[0028] In cell selection, the terminal 10 selects a camping cell based on the cell selection criterion S. For example, the terminal 10 may select, as the camping cell, a cell that satisfies the cell selection criterion S from the strongest cell 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 for 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 of the same carrier frequency as the camping cell (hereinafter referred to as "intra-frequency") and / or a cell of a different carrier frequency from the camping cell (hereinafter referred to as "inter-frequency") may be reselected. Further, the terminal 10 may control the cell reselection of the intra-frequency and / or inter-frequency based on information regarding 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 above 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 a reception level parameter and a quality level parameter, respectively. The cell selection criterion S may be that the Srxlev and / or Squal exceeds a predetermined value (for example, 0), or may be represented by the following Equation 1, for example. [Equation 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 referred to as "Q rxlevmeas ", for example, the Reference Signal Received Power (RSRP)) · The minimum reception level required in a specific cell (hereinafter referred to as "Q rxlevmin ") · The offset for Q rxlevmin (hereinafter referred to as "Q rxlevminoffset ") · The compensation value based on the maximum transmission power of the terminal 10 (hereinafter referred to as "P compensation ") · The temporary offset applied to a specific cell (hereinafter referred to as "Qoffset temp ")

[0032] Also, Squal may be derived based on at least one of the following parameters. · The quality measured by the terminal 10 for a specific cell (hereinafter, "Q" qualmeas , for example, the Reference Signal Received Quality (RSRQ)) · The minimum quality level required in a specific cell (hereinafter, "Q" qualmin ) · The offset with respect to Q (hereinafter, "Q" qualmeas ) qualminoffset · Qoffset · Qoffset temp

[0033] Note that P compensation may be a predetermined value, or a value based on the maximum transmission power level of the terminal 10 ("P" EMAX , "P" EMAX1 and "P" EMAX2 at least one of) and / or the maximum RF output class of the terminal 10 ("P" PowerClass ). For example, in Frequency Range (FR) 1 (for example, 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] Note that Q rxlevmin , Q rxlevminoffset , Qoffset temp , Q qualmin and Qqualminoffset Information regarding at least one of them may be notified by system information. Specifically, Q rxlevmin , Q rxlevminoffset , Qoffset temp , Q qualmin and Q qualminoffset Information regarding at least one of them 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. Hereinafter, SIB1, SIB2, and SIB4 are exemplified as examples of the first system information, the second system information, and the third system information, but it is needless to say that names other than SIB1, SIB2, and SIB4 may be used as long as they are similar system information. SIB1 includes information regarding cell selection (e.g., "cellSelectionInfo"), and the information may include information regarding at least one of Q rxlevmin , Q rxlevminoffset , Qoffset temp , Q qualmin and Q qualminoffset SIB2 includes information regarding intra-frequency cell reselection (e.g., "intraFreqCellReselectionInfo"), and the information may include information regarding at least one of Q rxlevmin , Q rxlevminoffset , Qoffset temp , Q qualmin and Q qualminoffset SIB4 includes information regarding inter-frequency cell reselection (e.g., "InterFreqCarrierFreqInfo"), and the information may include information regarding at least one of Q rxlevmin , Q rxlevminoffset , Qoffset temp , Q qualmin and Q qualminoffset of them.

[0035] (RedCap) In 3GPP (e.g., Release 17 of NR), it is being considered to support RedCap terminals that assume lower performance and price ranges than existing NR terminals introduced in Release 15 or 16. The RedCap terminals are expected to be used, for example, in industrial wireless sensors, video surveillance, wearable devices, etc.

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

[0037] Also, RedCap terminals identified by a specific type may have different capabilities. For example, a plurality of 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, a plurality of RedCap terminals with different capabilities may be identified by the above type or a subtype of the above type. Hereinafter, the terminal 10 with a single receiving antenna or the RedCap terminal with a single receiving antenna is referred to as a "single Rx terminal". Also, the terminal 10 with two receiving antennas or the RedCap terminal with two receiving antennas is referred to as a "two Rx terminal". Note that having a single receiving antenna and two receiving antennas may be equivalently described as having a single receiver and a dual receiver, respectively.

[0038] The coverage of the above specific type (for example, RedCap terminal), and / or the terminal 10 with a specific number of antennas (for example, single Rx terminal or two Rx terminal) is assumed to degenerate compared to existing NR terminals or terminals 10 with a larger number of antennas than the specific number of antennas. FIG. 2 is a diagram showing an example of the degradation of the coverage of the terminal 10 of a specific type and / or a specific number of antennas. For example, in FIG. 2, the terminal 10A is a single Rx terminal, and the terminal 10B is an existing NR terminal equipped with four receiving antennas.

[0039] For example, in FIG. 2, the Q measured at the terminal 10A with a single receiving antenna rxlevmeas and Q qualmeas are lower than those of the terminal 10B with a plurality of receiving antennas because the effect of receive diversity cannot be obtained. On the other hand, when the terminal 10A and the terminal 10B perform an evaluation of the cell selection criterion S based on the same value of a parameter (for example, at least one of Q rxlevmin , Q rxlevminoffset , Qoffset temp , Q qualmin and Q qualminoffset ), the Q of the terminal 10A rxlevmeasand Q qualmeas Since qualmeas is smaller than terminal 10B, the range in which terminal 10A satisfies the cell selection criterion S (for example, Srxlev > 0 and Squal > 0) may degenerate compared to the range in which terminal 10B satisfies the cell selection criterion S. That is, the coverage of terminal 10A may degenerate compared to the coverage of terminal 10B.

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

[0041] Therefore, in the present embodiment, (1) by prohibiting access of terminals 10 of a specific type and / or a specific number of antennas to a specific cell, a decrease in the utilization efficiency of radio resources in the specific cell is prevented. Also, (2) while allowing access of terminals 10 of a specific type and / or a specific number of antennas to a specific cell, degradation of the coverage of the terminals 10 is prevented.

[0042] Hereinafter, for example, it is assumed that 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 2Rx terminal. However, 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 reduced number of antennas compared to the terminal 10 of a predetermined number of antennas. For example, if the predetermined number of antennas is 8, the specific number of antennas may be 4.

[0043] (1) In the case of access prohibition The case of prohibiting (restricting or not permitting) access of at least one of a RedCap terminal, a single Rx terminal, and a 2Rx terminal to a specific cell will be described. In this case, the terminal 10 determines whether access to the specific cell is prohibited based on at least one of information regarding access of the RedCap terminal to the specific cell (hereinafter referred to as "RedCap access information"), information regarding access of the single Rx terminal in the specific cell (hereinafter referred to as "single Rx access information"), and information regarding access of the 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 of the RedCap terminal to a specific cell. 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 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 thereto. For example, the RedCap access information indicates that information indicating prohibition of the access (for example, set to "true" or "1" when the access is prohibited) is provided, is not included in the system information when the access is permitted, and may be included in the system information when the access is prohibited.

[0045] Also, the single Rx access information and the 2Rx access information are, respectively, for example, information regarding permission or prohibition of access to a specific cell by a single Rx terminal and a 2Rx terminal. For example, the single Rx access information and the 2Rx access information are information regarding 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 2Rx access information indicate that they are information indicating prohibition of the access (for example, set to "true" or "1" when the access is prohibited), are 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 above RedCap access information is included in the system information and / or whether the above single Rx access information and / or 2Rx access information is included in the system information.

[0047] Also, the terminal 10 may determine whether access to the specific 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 2Rx terminal.

[0048] FIG. 3 is a diagram showing an example of an access prohibition 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, a non-active state, or a connected state in which a specific timer (e.g., timer T311) is operating. Note that the specific timer defines the time until the RRC connection is re-established, is started when the re-establishment procedure is initiated, and may stop 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 where the specific timer is not operating (step S102; NO), this operation ends.

[0050] In step S103, the terminal 10 determines whether the terminal 10 is a RedCap terminal. If the terminal 10 is not a RedCap terminal (step S103; NO), this 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 access of the RedCap terminal to a specific cell is permitted. For example, the terminal 10 may determine whether RedCap access information is included in the system information received in step S101.

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

[0053] If access by the single Rx terminal to a specific cell is not permitted (step S105; NO), in step S106, terminal 10 determines 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, terminal 10 determines whether access by the dual Rx terminal to a specific cell is permitted. For example, terminal 10 may determine whether dual Rx access information is included in the system information received in step S101. If access by the dual Rx terminal to a specific cell is permitted (step S107; YES), this operation proceeds to step S110.

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

[0056] In step S109, terminal 10 determines that access to a specific cell is prohibited. As described above, terminal 10 can determine that access to a specific cell is prohibited 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 meets the cell selection criterion S, the terminal 10 may camp on the specific cell.

[0058] Note that the determination operation shown in FIG. 3 is only an example, and some steps may be omitted, or steps not shown may be added. Also, the order of at least some steps may be changed. For example, the determination order of steps 105 and S106, and steps S107 and S108 may be changed.

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

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

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

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

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

[0064] Note that in the above, it is determined 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 2Rx access information is included in the system information, but it is not limited to this. For example, when the RedCap access information, single Rx access information, or 2Rx access information is included in the system information regardless of whether it indicates permission or prohibition of the access, the terminal 10 may determine whether access to the specific cell is prohibited based on the value of the RedCap access information, single Rx access information, or 2Rx access information in the system information.

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

[0066] Note that in the following, the case where the cell selection criteria S1 and S2 are used for a single Rx terminal will be mainly described. However, when the cell selection criteria S1 and S2 are used for a 2Rx terminal, the following "single Rx terminal" may be read as "2Rx terminal".

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

[0068] Specifically, the terminal 10 receives information regarding Q for a single Rx terminal in a specific cell (hereinafter referred to as "Q rxlevmin information") and / or information regarding Q for a single Rx terminal in the specific cell (hereinafter referred to as "Q rxlevmin,SingleRx information"). The Q qualmin information can be rephrased as minimum reception level information regarding the minimum reception level for a single Rx terminal, and the Q qualmin,SingleRx information may be rephrased as minimum quality level information regarding the minimum quality level for a single Rx terminal. Also, the Q rxlevmin,SingleRx information and / or the Q qualmin,SingleRx information may be included in the system information. For example, the Q rxlevmin,SingleRx information and / or the Q qualmin,SingleRx information may be included in at least one of the above SIB1, SIB2, and SIB4. rxlevmin,SingleRx qualmin,SingleRx rxlevmin,SingleRx

[0069] The terminal 10 is Q rxlevmin,SingleRxDerive Q for a single Rx terminal based on information rxlevmin and derive Q qualmin,SingleRx for a single Rx terminal based on information qualmin The terminal 10 may control cell selection / reselection based on Srxlev derived based on the above Q rxlevmin for the single Rx terminal and Q rxlevmeas measured in the specific cell, and / or based on Squal derived based on the above Q qualmin for the single Rx terminal and Q qualmeas measured in the specific cell.

[0070] Note that Q rxlevmin and Q qualmin for the single Rx terminal may be smaller than Q rxlevmin and Q qualmin for terminals with a larger number of antennas than a specific number of antennas (for example, single or two receive antennas). Thereby, Q rxlevmeas and Q qualmeas measured by the single Rx terminal can more easily meet the cell selection criterion S1 even if it is smaller than Q rxlevmeas and Q qualmeas measured by the terminal with the larger number of antennas, so that the coverage of the 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 of the cell selection criterion S1 may be derived based on at least one of Q rxlevmin for the single Rx terminal in addition to Q rxlevmeas , Q rxlevminoffset , P compensation and Qoffset temp . Also, Squal may be based on at least one of Q qualmin for the single Rx terminal in addition to Q qualmeas , Q qualminoffset and Qoffset tempIt may be derived based on at least one of them. In FIG. 5, the formula of the cell selection criterion S1 is illustrated, but it is only an example and is not limited to what is shown. For example, if Srxlev and / or Squal of the cell selection criterion S1 is greater than (or equal to) a predetermined value, the predetermined value is not limited to 0.

[0072] Q in the cell selection criterion S1 rxlevmin is a parameter Q different from the parameter (e.g., "q-RxLevMin" or "q-RxLevMinSUL") used in the cell selection criterion S. rxlevmin,SingleRx It is derived based on the information. For example, as shown in FIG. 5, the terminal 10 is a single Rx terminal, and Q rxlevmin,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 for a specific cell (e.g., set to true), then Q rxlevmin is rxlevmin,SingleRx It may be derived based on the information (e.g., "q-RxLevMinSingleRx").

[0073] Also, Q in the cell selection criterion S1 qualmin is a parameter Q different from the parameter (e.g., "q-QualMin") used in the cell selection criterion S. qualmin,SingleRx It is derived based on the information. For example, as shown in FIG. 5, the terminal 10 is a single Rx terminal, and Q qualmin,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 for a specific cell (e.g., set to true), then Q qualmin is qualmin,SingleRx It may be derived based on the information (e.g., "q-QualMinSingleRx").

[0074] Note that when using the cell selection criterion S1 as described above for a 2Rx terminal, the above Q rxlevmin,SingleRx information is "Q for a 2Rx terminal in a specific cell rxlevminThe information regarding (hereinafter referred to as "Q rxlevmin,TwoRx information") may be read as such. Also, the Q qualmin,SingleRx information may be read as "the information regarding Q qualmin for 2Rx terminals in a specific cell (hereinafter referred to as "Q qualmin,TwoRx information")." An example of Q rxlevmin,SingleRx information, "q-RxLevMinSingleRx," may be read as an example of Q rxlevmin,TwoRx information, "RxLevMinTwoRx." Also, an example of Q qualmin,SingleRx information, "q-QualMinSingleRx," may be read as an example of Q qualmin,TwoRx information, "q-QualMinTwoRx." Also, "single Rx access information" may be read as "2Rx access information."

[0075] Figures 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 Figure 6, within the information regarding cell selection (e.g., "cellSelectionInfo") in SIB1, 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") are defined. The said Q rxlevmin,SingleRx information and Q qualmin,SingleRx information, or Q rxlevmin,TwoRx information and Q qualmin,TwoRx information may be used for the derivation of Q rxlevmin and Q qualmin of the cell selection criterion S1 at the time of cell selection. Note that when the terminal 10 is a single Rx terminal, if the said Q rxlevmin,SingleRx information and Q qualmin,SingleRx information are not included in SIB1, Q rxlevmin and Q qualmin are derived based on the existing parameters (e.g., "q-RxLevMin" and "q-QualMin") in SIB1, and the said Q rxlevmin and Q qualminCell selection may be controlled based on the existing cell selection criterion S based on this. Further, when the terminal 10 is a 2Rx terminal, when the Q rxlevmin,TwoRx information and Q qualmin,TwoRx information are not included in SIB1, Q rxlevmin and Q qualmin are derived respectively based on the existing parameters (for example, "q-RxLevMin" and "q-QualMin") in SIB1, and cell selection is controlled based on the existing cell selection criterion S based on the said Q rxlevmin and Q qualmin may be.

[0076] Further, at least one of the Q rxlevmin,SingleRx information, the Q qualmin,SingleRx information, the Q rxlevmin,TwoRx information, the Q qualmin,TwoRx information, and the information related to cell selection including these (for example, "cellSelectionInfo") may be conditional presence. Specifically, the Q rxlevmin,SingleRx information and the Q qualmin,SingleRx information are included in SIB1 when the single Rx access information indicates permission for access of a single Rx terminal (for example, when set to true in FIG. 6), and may not be included in SIB1 in other cases. Further, the Q rxlevmin,TwoRx information and the Q qualmin,TwoRx information are included in SIB1 when the 2Rx access information indicates permission for access of a 2Rx terminal (for example, when set to true in FIG. 6), and may not be included in SIB1 in other cases. Further, the information related to cell selection is included in SIB1 when the RedCap access information indicates permission for access of a RedCap terminal (for example, when set to true in FIG. 6), and may not be included in SIB1 in other cases.

[0077] In FIG. 7, within the information related to intra-frequency cell reselection of SIB2 (for example, "intraFreqCellReselectionInfo"), the Q rxlevmin,SingleRx information (for example, "q-RxLevMinSingleRx"), the Q qualmin,SingleRx information (for example, "q-QualMinSingleRx"), the Qrxlevmin,TwoRx Information (e.g., "RxLevMinTwoRx") and Q qualmin,TwoRx Information (e.g., "q-QualMinTwoRx") is defined. The Q rxlevmin,SingleRx Information and Q qualmin,SingleRx Information, or Q rxlevmin,TwoRx Information and Q qualmin,TwoRx Information is used for the derivation of Q and Q rxlevmin of the cell selection criterion S1 during intra-frequency cell reselection. Note that when the terminal 10 is a single Rx terminal, if the Q qualmin Information and Q rxlevmin,SingleRx Information is not included in SIB2, Q and Q qualmin,SingleRx are derived based on the existing parameters in SIB2 (e.g., "q-RxLevMin" and "q-QualMin" in "intraFreqCellReselectionInfo"), and cell reselection may be controlled based on the existing cell selection criterion S based on the Q rxlevmin and Q qualmin derived. Also, when the terminal 10 is a 2Rx terminal, if the Q rxlevmin Information and Q qualmin Information is not included in SIB2, Q and Q rxlevmin,TwoRx are derived based on the existing parameters in SIB2 (e.g., "q-RxLevMin" and "q-QualMin" in "intraFreqCellReselectionInfo"), and cell reselection may be controlled based on the existing cell selection criterion S based on the Q qualmin,TwoRx derived. rxlevmin and Q qualmin are derived, and cell reselection may be controlled based on the existing cell selection criterion S based on the Q rxlevmin and Q qualmin derived.

[0078] In FIG. 8, as information (e.g., "InterFreqNeighCellInfo") regarding each inter-frequency in the list of inter-frequency information in SIB4 (e.g., "interFreqCarrierFreqList"), 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 defined. The Q rxlevmin,SingleRx information and Q qualmin,SingleRx information, or Q rxlevmin,TwoRx information and Q qualmin,TwoRx information is used for deriving Q of cell selection criterion S1 during inter-frequency cell reselection rxlevmin and Q qualmin It may be used. Note that when the terminal 10 is a single Rx terminal, if the Q rxlevmin,SingleRx information and Q qualmin,SingleRx information is not included in SIB4, Q rxlevmin and Q qualmin are derived based on existing parameters in SIB4 (e.g., "q-RxLevMin" and "q-QualMin" in "InterFreqCarrierFreqInfo"), respectively, and cell reselection is controlled based on the existing cell selection criterion S based on the Q rxlevmin and Q qualmin It may be. Also, when the terminal 10 is a 2Rx terminal, if the Q rxlevmin,TwoRx information and Q qualmin,TwoRx information is not included in SIB4, Q rxlevmin and Q qualmin are derived based on existing parameters in SIB4 (e.g., "q-RxLevMin" and "q-QualMin" in "InterFreqCarrierFreqInfo"), respectively, and cell reselection is controlled based on the existing cell selection criterion S based on the Q rxlevmin and Q qualmin It may be.

[0079] As described above, according to the cell selection criterion S1, Srxlev is derived based on Q rxlevmin for a single Rx terminal or a 2Rx terminal, and / or Squal is derived based on Q qualmin for a single Rx terminal or a 2Rx terminal. Therefore, Q rxlevmeas and Q qualminThe range in which a single Rx terminal or a 2Rx terminal, for which the measured value is expected to be smaller than that of the terminal with the above larger number of antennas, satisfies the cell selection criterion S1 can be expanded. Therefore, the coverage for the single Rx terminal or the 2Rx terminal can be expanded.

[0080] (2.2) Cell selection criterion S2 In the cell selection criterion S2, the terminal 10 derives Srxlev based on the offset for a single Rx terminal or a 2Rx terminal with respect to Q in a specific cell (hereinafter referred to as "Q rxlevmin "), and / or derives Squal based on the offset for a single Rx terminal or a 2Rx terminal with respect to Q in a specific cell (hereinafter referred to as "Q rxlevminoffset,Rx "). qualmin Specifically, the terminal 10 receives information regarding Q in a specific cell (hereinafter referred to as "Q qualminoffset,Rx information"), and / or information regarding Q in the specific cell (hereinafter referred to as "Q

[0081] information"). The Q rxlevmin information may be paraphrased as minimum reception level information regarding the minimum reception level, and the Q rxlevmin information may be paraphrased as minimum quality level information regarding the minimum quality level. qualmin In addition, the Q qualmin information and / or the Q rxlevmin information may be included in the system information. For example, the Q qualmin information and / or the Q

[0082] information may be included in at least one of the above SIB1, SIB2, and SIB4. The terminal 10 derives Q rxlevmin based on the Q qualmin information. Also, the terminal 10 derives Q rxlevmin based on the Q qualmin information. Note that the Q rxlevmin and the Q rxlevmin may be common between the single Rx terminal or the 2Rx terminal and the terminal with the above larger number of antennas. qualmin In addition, the terminal 10 derives Q qualmin based on the Q rxlevmin information. Also, the terminal 10 derives Q qualmin based on the Q information. Note that the Q and the Q may be common between the single Rx terminal or the 2Rx terminal and the terminal with the above larger number of antennas.

[0083] The terminal 10 is Q rxlevmin and Q rxlevmin for a single Rx terminal or a 2Rx terminal with respect to Q rxlevminoffset,Rx and Q measured in a specific cell rxlevmeas Based on the derived Srxlev, and / or Q qualmin and Q qualmin for a single Rx terminal or a 2Rx terminal with respect to Q qualminoffset,Rx and Q measured in a specific cell qualmeas Based on the derived Squal, cell selection / reselection may be controlled.

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

[0085] The Q in the cell selection criterion S2 rxlevminoffset,Rx and / or Q qualminoffset,Rx may be a predetermined value (for example, a value defined in the specification). Alternatively, the terminal 10 may receive information regarding Q rxlevminoffset,Rx (hereinafter referred to as "Q rxlevminoffset,Rx information") and derive Q rxlevminoffset,Rx based on the received Q rxlevminoffset,Rx information. Also, the terminal 10 may Q qualminoffset,RxInformation regarding (hereinafter referred to as "Q" qualminoffset,Rx information") is received, and Q qualminoffset,Rx may be derived based on the received Q qualminoffset,Rx information.

[0086] Q rxlevminoffset,Rx information may be paraphrased as information regarding the offset with respect to Q rxlevmin . Also, Q qualminoffset,Rx information may be paraphrased as information regarding the offset with respect to Q qualmin . The said Q rxlevminoffset,Rx information and / or Q qualminoffset,Rx information may be included in the system information. For example, Q rxlevminoffset,Rx information and / or Q qualminoffset,Rx information may be included in at least one of SIB1, SIB2, and SIB4.

[0087] Also, Q rxlevminoffset,Rx information may include information regarding the offset for a single Rx terminal with respect to Q rxlevmin (hereinafter referred to as "Q rxlevminoffset,SingleRx information", for example, "q-RxLevMinOffsetSingleRx"), and / or information regarding the offset for a 2Rx terminal with respect to Q rxlevmin (hereinafter referred to as "Q rxlevminoffset,TwoRx information", for example, "q-RxLevMinOffsetTwoRx"). Also, Q rxlevminoffset,Rx information may include information regarding the offset for a single Rx terminal with respect to Q qualmin (hereinafter referred to as "Q qualminoffset,SingleRx information", for example, "q-RxLevMinOffsetSingleRx"), and / or information regarding the offset for a 2Rx terminal with respect to Q qualmin (hereinafter referred to as "Q qualminoffset,TwoRx information", for example, "q-RxLevMinOffsetTwoRx").

[0088] In cell selection criterion S2, Q rxlevminoffset,Rx and / or Q qualminoffset,Rx for a single Rx terminal or a 2Rx terminal is used, so Q rxlevmeas and Q qualmeasThe range in which a single Rx terminal or a 2Rx terminal, for which it is assumed that the measured value is smaller than that of a terminal with the above-mentioned large number of antennas, satisfies the cell selection criterion S2 can be expanded. Therefore, the coverage for a single Rx terminal or a 2Rx terminal can be expanded.

[0089] Figs. 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, in the information regarding cell selection in SIB1 (for example, "cellSelectionInfo"), Q rxlevminoffset,SingleRx information (for example, "q-RxLevMinOffsetSingleRx"), Q qualminoffset,SingleRx information (for example, "q-QualMinOffsetSingleRx"), Q rxlevminoffset,TwoRx information (for example, "q-RxLevMinOffsetTwoRx") and Q qualminoffset,TwoRx information (for example, "q-QualMinOffsetTwoRx") are defined. The Q rxlevminoffset,SingleRx information and Q qualminoffset,SingleRx information, or the Q rxlevminoffset,TwoRx information and Q qualminoffset,TwoRx information may be used for the derivation of Srxlev and Squal as an offset with respect to Q rxlevmin and Q qualmin in the cell selection criterion S2 at the time of cell selection. When the terminal 10 is a single Rx terminal, if the Q rxlevminoffset,SingleRx information and Q qualminoffset,SingleRx information are not included in SIB1, the terminal 10 may apply default values (for example, 0 (zero)) to Q rxlevminoffset,Rx and Q qualminoffset,Rx in the cell selection criterion S2. Also, when the terminal 10 is a 2Rx terminal, if the Q rxlevminoffset,TwoRx information and Q qualminoffset,TwoRx information are not included in SIB1, the terminal 10 may apply default values (for example, 0 (zero)) to Q rxlevminoffset,Rx and Q qualminoffset,Rx in the cell selection criterion S2.

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

[0091] In FIG. 11, within the information related to intra-frequency cell reselection of SIB2 (e.g., "intraFreqCellReselectionInfo"), 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") are defined. Q rxlevminoffset,SingleRx Information and Q qualminoffset,SingleRx Information, or Q rxlevminoffset,TwoRx Information and Q qualminoffset,TwoRx Information may be used for the derivation of Srxlev and Squal as the offset for Q rxlevmin and Q qualmin of the cell selection criterion S2 during intra-frequency cell reselection. Note that 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 is Q in the cell selection criterion S2.rxlevminoffset,Rx and Q qualminoffset,Rx A default value (e.g., 0 (zero)) may be applied to [the relevant items]. Also, when the terminal 10 is a 2Rx terminal, if Q rxlevminoffset,TwoRx information and Q qualminoffset,TwoRx information is not included in SIB2, the terminal 10 may apply a default value (e.g., 0 (zero)) to Q rxlevminoffset,Rx and Q qualminoffset,Rx A default value (e.g., 0 (zero)) may be applied to [the relevant items].

[0092] In FIG. 12, as information (e.g., "InterFreqNeighCellInfo") regarding each inter-frequency within the list of information regarding the inter-frequency of SIB4 (e.g., "interFreqCarrierFreqList"), 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") are defined. Q rxlevminoffset,SingleRx information and Q qualminoffset,SingleRx information, or Q rxlevminoffset,TwoRx information and Q qualminoffset,TwoRx information may be used for the derivation of Srxlev and Squal as an offset with respect to Q of the cell selection criterion S2 at the time of inter-frequency cell reselection. Note that when the terminal 10 is a single Rx terminal, if Q rxlevmin information and / or Q qualmin information is not included in SIB4, the terminal 10 may apply a default value (e.g., 0 (zero)) to Q in the cell selection criterion S2 rxlevminoffset,SingleRx information and / or Q qualminoffset,SingleRx information. Also, when the terminal 10 is a 2Rx terminal, if Q rxlevminoffset,Rx information and / or Q qualminoffset,Rx information is not included in SIB4, the terminal 10 may apply a default value (e.g., 0 (zero)) to Q rxlevminoffset,TwoRx information and / or Q qualminoffset,TwoRx information. If not, the terminal 10 may apply a default value (e.g., 0 (zero)) to Q rxlevminoffset,Rx and / or Q qualminoffset,Rx A default value (e.g., 0 (zero)) may be applied to [the relevant items].

[0093] As described above, according to the cell selection criterion S2, for a single Rx terminal or a 2Rx terminal, Q rxlevminoffset,Rx is used to derive Srxlev, and / or, for a single Rx terminal or a 2Rx terminal, Q qualminoffset,Rx is used to derive Squal. Therefore, the range in which a single Rx terminal or a 2Rx terminal, for which the measurement values of Q rxlevmeas and Q qualmin are assumed to be smaller than those of the terminals with the above-mentioned larger number of antennas, satisfies the cell selection criterion S2 can be expanded. Accordingly, the coverage for a single Rx terminal or a 2Rx terminal can be expanded.

[0094] Note that the cell selection criteria S1 and S2 may be combined. Specifically, Srxlev may be derived based on Q rxlevmin for a single Rx terminal or a 2Rx terminal in the cell selection criterion S1 and Q rxlevminoffset,Rx for a single Rx terminal or a 2Rx terminal in the cell selection criterion S2. Also, Squal may be derived based on Q qualmin for a single Rx terminal or a 2Rx terminal in the cell selection criterion S1 and Q qualminoffset,Rx for a single Rx terminal or a 2Rx terminal in the cell selection criterion S2.

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

[0096] Note that in the above cell selection criterion S1, Q rxlevmin and Q qualmin for a single Rx terminal or a 2Rx terminal have been described, but it goes without saying that they are also applicable to Q rxlevmin and Q qualmin for a RedCap terminal. Similarly, in the above cell selection criterion S2, Q rxlevminoffset,Rxand Q qualminoffset,Rx has been described, but Q for the RedCap terminal rxlevminoffset and Q qualminoffset is of course applicable as well.

[0097] Also, the above cases of (1) access prohibited and (2) access permitted can be combined. For example, when access to a specific cell is prohibited and access to cells of the same and / or different carrier frequencies 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 the wireless communication system) Next, the configuration of each device of the wireless communication system 1 as described above will be explained. Note that the following configuration is for showing the necessary configuration in the description of this embodiment, and does not exclude that each device includes functional blocks other than those shown in the figure.

[0099] <Hardware configuration> FIG. 13 is a diagram showing an example of the hardware configuration of each device in the wireless communication system according to this embodiment. Each device (for example, the terminal 10, the base station 20, the 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, an input device that receives 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 this embodiment by reading a program from the storage device 12 and executing it. Each device in the wireless communication system 1 may be configured by one or more processors 11. Also, each of these devices may be called a computer.

[0101] The storage device 12 is composed of, for example, storage such as a memory, HDD (Hard Disk Drive), and / or SSD (Solid State Drive). The storage device 12 may store various information necessary for the execution of processing by the processor 11 (for example, programs 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. Further, the communication device 13 may include an amplifier, an RF (Radio Frequency) device that processes radio signals, and a BB (BaseBand) device that performs baseband signal processing.

[0103] The RF device generates a radio signal to be transmitted from the antenna A, for example, by performing D / A conversion, modulation, frequency conversion, power amplification, etc. on the digital baseband signal received from the BB device. Further, the RF device generates a digital baseband signal by performing frequency conversion, demodulation, A / D conversion, etc. on the radio signal received from the antenna and transmits it to the BB device. The BB device performs processing to convert the digital baseband signal into a packet and processing to convert the packet into a digital baseband signal.

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

[0105] The hardware configuration described above is only an example. Each device in the wireless communication system 1 may have some of the hardware described in FIG. 13 omitted, or may be equipped with hardware not described in FIG. 13. Also, the hardware shown in FIG. 13 may be composed of one or more chips.

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

[0107] Note that all or part of the functions realized by the receiving unit 101 and the transmitting unit 102 can be realized using the communication device 13. Also, 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. Further, 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. Also, the receiving unit 101 may receive information and / or data transmitted via the downlink signal. Here, "receiving" may include performing processing related to reception such as, for example, reception of a radio signal, demapping, demodulation, decoding, monitoring, and measurement. The downlink signal may include, for example, at least one of PDSCH, PDCCH, a downlink reference signal, a synchronization signal, and PBCH.

[0109] The receiving unit 101 monitors PDCCH candidates in the search space and detects DCI. The receiving unit 101 may receive downlink user data and / or higher layer control information (for example, Medium Access Control Element (MAC CE), Radio Resource Control (RRC) message, etc.) via the PDSCH scheduled using the DCI.

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

[0111] Also, the receiving unit 101 is for the terminal 10 with a specific number of antennas in a specific cell (e.g., single Rx terminal and / or 2Rx terminal) rxlevmin (minimum reception level) regarding the minimum reception level information (e.g., Q rxlevmin,SingleRx information and / or Q rxlevmin,TwoRx information), and / or, for the terminal with the specific number of antennas in the specific cell qualmin (minimum quality level) regarding the minimum quality level information (e.g., Q qualmin,SingleRx information and / or Q qualmin,TwoRx information) may be received (e.g., FIGS. 6 to 8).

[0112] Also, the receiving unit 101 is for Q rxlevmin (minimum reception level) regarding the minimum reception level information (e.g., Q rxlevmin information), and / or, for Q in a specific cell qualmin (minimum quality level) regarding the minimum quality level information (e.g., Q qualmin information) may be received (e.g., FIGS. 6 to 8, 10 to 12).

[0113] Also, the receiving unit 101 is Q rxlevmin which is an offset for the terminal 10 with a specific number of antennas for Q (e.g., single Rx terminal and / or 2Rx terminal) rxlevminoffset,Rx regarding the information (e.g., Q rxlevminoffset,SingleRx information and / or Q rxlevminoffset,TwoRx information), and / or, Q qualmin which is an offset for the terminal 10 with the specific number of antennas for Q qualminoffset,Rx regarding the information (e.g., Q qualminoffset,SingleRx information and / or Q qualminoffset,TwoRx information) may be received (e.g., FIGS. 10 to 12).

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

[0115] The transmitting unit 102 may transmit uplink user data and / or higher layer control information (e.g., 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 specific type of terminal 10 (e.g., RedCap terminal) and / or a terminal 10 with a specific number of antennas (e.g., single Rx terminal and / or 2Rx terminal) to a specific cell. Further, the control unit 103 controls cell selection / reselection of the specific type of terminal 10 and / or the terminal 10 with the specific number of antennas.

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

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

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

[0120] Further, when the terminal 10 is a specific type of terminal 10 (e.g., a RedCap terminal) and the first access information (e.g., RedCap access information) is not included in the system information, the control unit 103 may determine that access of the terminal 10 to a specific cell is prohibited (e.g., FIG. 3).

[0121] Further, when the terminal 10 is a specific type of terminal 10 (e.g., a RedCap terminal) and the 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 2Rx terminal) and whether the 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, the system information contains RedCap access information, the terminal 10 is a single Rx access terminal, and the single Rx access information is not included in the system information, the control unit 103 may determine that the access of the terminal 10 to a specific cell is prohibited (for example, FIG. 3). On the other hand, when the terminal 10 is a single Rx access terminal and the single Rx access information is included in the system information, the control unit 103 may evaluate a 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 controls cell selection and / or cell reselection based on Srxlev (received level parameter) derived based on the minimum received level information for the terminal 10 with a specific number of antennas (for example, Q rxlevmin,SingleRx information or Q rxlevmin,TwoRx information), and / or Squal (quality level parameter) derived based on the minimum quality level information for the terminal 10 with a specific number of antennas (for example, Q qualmin,SingleRx information or Q qualmin,TwoRx information) (for example, 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 2Rx terminal), the control unit 103 may derive Srxlev based on the minimum received level information for the terminal 10 with the specific number of antennas (for example, Q rxlevmin,SingleRx information or Q rxlevmin,TwoRx information), and / or derive the Squal based on the minimum quality level information for the terminal 10 with the specific number of antennas (for example, Q qualmin,SingleRx information or Q qualmin,TwoRx information) (for example, FIG. 5). Thus, the control unit 103 may derive Srxlev and / or Squal based on whether it is a terminal 10 with a specific number of antennas.

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

[0126] In addition, the control unit 103 may control cell selection and / or cell reselection based on Srxlev derived based on Q rxlevmin information, Q rxlevmin and Q rxlevmin which is an offset for terminals 10 with a specific number of antennas with respect to Q rxlevminoffset,Rx , and / or based on Squal derived based on Q qualmin information, Q qualmin and Q qualmin which is an offset for terminals 10 with a specific number of antennas with respect to Q qualminoffset,Rx (e.g., FIG. 9).

[0127] The Q rxlevminoffset,Rx and / or Q qualminoffset,Rx may be predetermined values. Alternatively, the control unit 103 may derive report Q rxlevminoffset,Rx based on Q qualminoffset,Rx information and may derive report Q qualminoffset,Rx based on Q qualminoffset,Rx information.

[0128] <<Base Station>> FIG. 15 is a diagram showing an example of the functional block configuration of the base station according to the present embodiment. As shown in FIG. 15, the base station 20 includes a reception unit 201, a transmission unit 202, and a control unit 203.

[0129] Note that all or part of the functions realized by the receiving unit 201 and the transmitting unit 202 can be realized using the communication device 13. Also, 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. Further, 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 uplink signal. Also, the receiving unit 201 may receive information and / or data transmitted via the uplink signal.

[0131] The transmitting unit 202 transmits the downlink signal. Also, the transmitting unit 202 may transmit information and / or data transmitted via the downlink signal. Specifically, the transmitting unit 202 may transmit system information (for example, SIB1, SIB2, or SIB4). Also, the transmitting unit 202 may transmit minimum reception level information (for example, Q rxlevmin,SingleRx information and / or Q rxlevmin,TwoRx information) and minimum quality level information (for example, Q qualmin,SingleRx information and / or Q qualmin,TwoRx information) for the terminal 10 with a specific number of antennas (for example, FIGS. 6 to 8). Also, the transmitting unit 202 may transmit the above Q rxlevmin information and / or Q qualmin information (for example, FIGS. 6 to 8, 10 to 12). Also, the transmitting unit 202 may transmit the above Q rxlevminoffset,Rx information and / or Q qualminoffset,Rx information (for example, FIGS. 10 to 12).

[0132] The control unit 203 performs various controls in the base station 20. The control unit 203 controls access by specific types of terminals 10 and / or terminals 10 with a specific number of antennas to a specific cell. Further, the control unit 203 controls cell selection / reselection of specific types of terminals 10 and / or terminals 10 with a specific number of antennas.

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

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

[0135] Also, the uses of the terminal 10 in the above embodiments (e.g., for RedCap, IoT, etc.) are not limited to the examples and may be used for any use (e.g., eMBB, URLLC, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.) as long as it has a similar function. Further, the formats of the various information are not limited to the above embodiments and may be appropriately changed to bit representations (0 or 1), boolean values (Boolean: true or false), integer values, characters, etc. Also, the singular and plural in the above embodiments may be changed to each other.

[0136] The embodiments described above are for facilitating the understanding of the present disclosure and are not for limiting and interpreting the present disclosure. The flowcharts, sequences, each element included in the embodiments, and their arrangements, indexes, conditions, etc. described in the embodiments are not limited to those illustrated and can be changed as appropriate. Also, at least a part of the configurations described in the above embodiments can be partially replaced or combined.

[0137] Note that 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 for a specific cell (for example, set to true), Qrxlevmin is derived based on the Qrxlevmin, SingleRx information (for example, "q-RxLevMinSingleRx"), but is not limited thereto. When it is determined that the terminal 10 is permitted to access the cell based on the RedCap access information and / or the single Rx access information in SIB1 (that is, the cell is not prohibited for the terminal 10), Qrxlevmin may be derived based on the Qrxlevmin, SingleRx information (for example, "q-RxLevMinSingleRx").

[0138] Also, in FIG. 5, when the terminal 10 is a single Rx terminal, the Q qualmin,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 for a specific cell (for example, set to true), Q qualmin is derived based on the Q qualmin,SingleRx information (for example, "q-QualMinSingleRx"), but is not limited thereto. When it is determined that the terminal 10 is permitted to access the cell based on the RedCap access information and / or the single Rx access information in SIB1 (that is, the cell is not prohibited for the terminal 10), Qqualmin may be derived based on Q qualmin,SingleRx information (e.g., "q-QualMinSingleRx").

Claims

1. A receiving unit that receives minimum reception level information regarding the minimum reception level for a terminal with a specific number of antennas in a specific cell, and / or minimum quality level information regarding the minimum quality level for a terminal with a specific number of antennas in the specific cell; 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; A terminal comprising the above.

2. When the terminal is a terminal with the specific number of antennas, the control unit derives the reception level parameter based on the minimum reception level information and / or derives the quality level parameter based on the minimum quality level information. The terminal according to Claim 1.

3. When access by the specific type of terminal to the specific cell is permitted and / or access by the terminal with the specific number of antennas in the specific cell is permitted, the control unit derives the reception level parameter based on the minimum reception level information and / or derives the quality level parameter based on the minimum quality level information. The terminal according to Claim 2.

4. The minimum reception level information and / or the minimum quality level information is included in at least one of: first system information used for cell selection, second system information used for cell reselection at the same carrier frequency as the cell on which camping is performed, and third system information used for cell reselection at a carrier frequency different from the cell on which camping is performed. The terminal according to any one of Claims 1 to 3.

5. A receiving unit that receives minimum reception level information regarding the minimum reception level in a specific cell and / or minimum quality level information regarding the minimum quality level in the specific cell; 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 from the minimum reception level information and an offset for a terminal with a specific number of antennas with respect to the minimum reception level, and / or a quality level parameter derived based on the minimum quality level derived from the minimum quality level information and an offset for a terminal with a specific number of antennas with respect to the minimum quality level; A terminal comprising the above.

6. The receiving unit receives information regarding the offset with respect to the minimum reception level and / or information regarding the offset with respect to the minimum quality level. The terminal according to claim 5.

7. The offset with respect to the minimum reception level and / or the offset with respect to the minimum quality level is a predetermined value. The terminal according to claim 5.

8. The terminal with the specific number of antennas is a terminal with a single reception antenna and / or a terminal with two reception antennas. The terminal according to any one of claims 1 to 7.

9. A step of receiving minimum reception level information regarding the minimum reception level for a terminal with a specific number of antennas in a specific cell and / or minimum quality level information regarding the minimum quality level for a terminal with a specific number of antennas in the specific cell; A step of controlling 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; A wireless communication method for a terminal comprising the above.

10. A step of receiving minimum reception level information regarding the minimum reception level in a specific cell and / or minimum quality level information regarding the minimum quality level in the specific cell; Based on a reception level parameter derived based on the minimum reception level derived based on the minimum reception level information and the offset for a terminal with a specific number of antennas with respect to the minimum reception level, and / or based on a quality level parameter derived based on the minimum quality level derived based on the minimum quality level information and the offset for a terminal with a specific number of antennas with respect to the minimum quality level, a step of controlling cell selection and / or cell reselection; A wireless communication method for a terminal comprising the above.

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