WO2023080036A1

WO2023080036A1 - Communication device, base station, and communication method

Info

Publication number: WO2023080036A1
Application number: PCT/JP2022/040001
Authority: WO
Inventors: 樹長野; 秀明 ▲高▼橋
Original assignee: 株式会社デンソー; トヨタ自動車株式会社
Priority date: 2021-11-02
Filing date: 2022-10-26
Publication date: 2023-05-11

Abstract

This communication device (100) comprises: a transmission unit (111) for transmitting a sounding reference signal (SRS); a reception unit (112) for receiving, from a base station (200), configuration information that includes an SSB index indicating a synchronization signal and physical notification channel block (SSB), which is referenced for the SRS transmission; and a control unit (120) for referring to the SSB indicated by the SSB index and controlling the SRS transmission. Upon reception of an absolute radio frequency channel number indicating a frequency position at which a non-cell-defining SSB is transmitted, the control unit (120) specifies that the SSB indicated by the SSB index is a non-cell-defining SSB (502).

Description

Communication device, base station, and communication method

Cross-references to related applications

This application is based on and claims the benefit of priority from patent application number 2021-179799, filed November 2, 2021, the entire contents of which are incorporated by reference. incorporated herein by.

The present disclosure relates to communication devices, base stations, and communication methods used in mobile communication systems.

In recent years, in the 3GPP (registered trademark; the same shall apply hereinafter) (3rd Generation Partnership Project), which is a standardization project for mobile communication systems, a specific user device having a reduced communication capacity compared to general user devices is designated as a 5th generation (5G) system. are being considered to be provided. A specific user device is a user device that has middle-range performance and price for IoT (Internet of Things). a small number of receivers. Such a specific user equipment is called RedCap UE (Reduced Capability User Equipment).

In addition, in the 5G system, a bandwidth part (BWP: Bandwidth Part) is defined for the purpose of reducing power consumption of user equipment and making effective use of broadband carriers (see, for example, Non-Patent Document 1). A user equipment for which BWP is set does not need to support the same bandwidth as the cell bandwidth, and can perform communication in a frequency band narrower than the cell bandwidth. BWP includes initial BWP (initial DL BWP and initial UL BWP) and dedicated BWP (dedicated DL BWP and dedicated UL BWP). Here, DL refers to downlink and UL refers to downlink. The initial BWP is a BWP that is used at least for initial access, and is commonly used by a plurality of user devices. A dedicated BWP is a BWP that is dedicated (UE-specific) to a certain user equipment.

The base station transmits a synchronization signal block (SSB: Synchronization Signal/PBCH (Physical Broadcast Channel) block) at the initial BWP (initial DL BWP). A synchronization signal block may also be referred to as a synchronization signal and physical broadcast channel block. An SSB associated with System Information Block Type 1 (SIB1) is called a Cell Defining SSB (CD-SSB). From the perspective of one UE, one serving cell is associated with one CD-SSB. SIB1 is also called RMSI (Remaining Minimum System Information). For example, the user equipment performs cell search and cell selection/reselection based on the received CD-SSB.

In 3GPP, assuming RedCap UE, it has been agreed to set an initial BWP for RedCap UE independently of the conventional initial BWP. Such a newly introduced initial BWP is called a separate initial BWP. Also, it has been proposed to set SSB transmission in separate initial DL BWP (for example, see Non-Patent Documents 2 and 3).

By the way, for the purpose of beam control of a physical uplink control channel (PUCCH) that transmits uplink control information (UCI) from the user equipment to the base station, spatial setting from the base station to the user equipment ) is set. Such spatial settings include parameters for setting signals to be referred to in PUCCH beam control, and SSB indexes can be set as such parameters (see Non-Patent Document 4, for example). A user equipment for which an SSB index is set as a spatial setting for PUCCH transmission performs PUCCH transmission using the same spatial domain filter as the spatial domain filter used for receiving the SSB indicated by the SSB index (for example, non-patent literature 5).

A communication device (100) according to a first aspect shows a transmitter (111) that performs sounding reference signal (SRS) transmission, and a synchronization signal and a physical broadcast channel block (SSB) that are referred to for the SRS transmission. It comprises a receiver (112) that receives configuration information including an SSB index from the base station (200), and a controller (120) that controls the SRS transmission by referring to the SSB indicated by the SSB index. The control unit (120) identifies the SSB indicated by the SSB index as the non-cell-defined SSB (502) when receiving the absolute radio frequency channel number indicating the frequency position where the non-cell-defined SSB is transmitted.

The base station (200) according to the second aspect includes a receiving unit (212) that receives sounding reference signal (SRS) transmission from the communication device (100), and a synchronization signal and physical broadcast that are referred to the SRS transmission. a transmitter (211) configured to transmit configuration information including an SSB index indicating a channel block (SSB) to the communication device (100). The transmitting unit (211) transmits an absolute radio frequency channel number indicating a frequency position where the non-cell defined SSB is transmitted, for specifying the SSB indicated by the SSB index as a non-cell defined SSB (502). Send to the communication device (100).

A communication method according to the third aspect is a communication method executed by the communication device (100). The communication method comprises the step of transmitting a sounding reference signal (SRS), and transmitting configuration information including a synchronization signal and an SSB index indicating a physical broadcast channel block (SSB) to be referred to for the SRS transmission to the base station (200). ), and controlling the SRS transmission by referring to the SSB indicated by the SSB index. The controlling step includes identifying the SSB indicated by the SSB index as the non-cell-defined SSB (502) when receiving an absolute radio frequency channel number indicating a frequency location on which the non-cell-defined SSB is transmitted. .

A communication method according to the fourth aspect is a communication method executed by the base station (200). The communication method includes steps of receiving a sounding reference signal (SRS) transmission from a communication device (100), and setting a synchronization signal and an SSB index indicating a physical broadcast channel block (SSB) to be referenced for the SRS transmission. transmitting information to said communication device (100); absolute radio indicating a frequency location on which said non-cell-defined SSB is transmitted, for identifying said SSB indicated by said SSB index as a non-cell-defined SSB (502); and sending a frequency channel number to the communication device (100).

The objects, features, advantages, etc. of the present disclosure will become clearer from the detailed description below with reference to the accompanying drawings.

FIG. 1 is a diagram showing the configuration of a mobile communication system according to an embodiment. FIG. 2 is a diagram showing a configuration example of a protocol stack in the mobile communication system according to the embodiment. FIG. 3 is a diagram illustrating an example of RRC parameters for SSB. FIG. 4 is a diagram showing an example of the relationship between SSB and initial BWP according to the embodiment. FIG. 5 is a diagram showing the configuration of the UE according to the embodiment. FIG. 6 is a diagram showing the configuration of a base station according to the embodiment. FIG. 7 is a diagram illustrating an example of SSB identification operation in the UE according to the first embodiment. FIG. 8 is a diagram illustrating an example of PUCCH transmission beam control according to the first embodiment. FIG. 9 is a diagram showing an example of spatial relationship setting information (PUCCH-SpatialRelationInfo) according to the first embodiment. FIG. 10 is a diagram showing an example of spatial relationship setting information (PUCCH-SpatialRelationInfo) according to the first embodiment. FIG. 11 is a diagram illustrating an example of SRS transmission beam control according to the first embodiment. FIG. 12 is a diagram showing an example of spatial relationship setting information (SRS-SpatialRelationInfo) according to the first embodiment. FIG. 13 is a diagram showing an example of RLM/BFD control according to the first embodiment. FIG. 14 is a diagram illustrating an example of RLM reference signal configuration information (RadioLinkMonitoringRS) according to the first embodiment. FIG. 15 is a diagram illustrating an example of RLM reference signal configuration information (RadioLinkMonitoringRS) according to the first embodiment. FIG. 16 is a diagram illustrating an example of RLM reference signal configuration information (RadioLinkMonitoringRS) according to the first embodiment. FIG. 17 is a diagram illustrating an example of UL transmission power control according to the first embodiment. FIG. 18 is a diagram showing an example of pathloss reference signal setting information according to the first embodiment. FIG. 19 is a diagram showing an example of pathloss reference signal setting information according to the first embodiment. FIG. 20 is a diagram showing an example of setting information (PUSCH-PowerControl) for setting UE-specific parameters for PUSCH transmission power control according to the first embodiment. FIG. 21 is a diagram showing an example of setting information (PUSCH-PowerControl) for setting UE-specific parameters for PUSCH transmission power control according to the first embodiment. FIG. 22 is a diagram showing an example of SSB identification operation in the UE 100 according to the second embodiment. FIG. 23 is a diagram illustrating an example of PUCCH transmission beam control according to the second embodiment. FIG. 24 is a diagram illustrating an example of SRS transmission beam control according to the second embodiment. FIG. 25 is a diagram showing an example of RLM/BFD control according to the second embodiment. FIG. 26 is a diagram illustrating an example of UL transmission power control according to the second embodiment. FIG. 27 is a diagram illustrating an example of UL transmission power in a UE according to the second embodiment; FIG. 28 is a diagram illustrating an example of UL transmission power in a UE according to the second embodiment; 29 is a diagram illustrating an example of UL transmission power in a UE according to the second embodiment; FIG. FIG. 30 is a diagram illustrating an example of UL transmission power in a UE according to the second embodiment; 31 is a diagram illustrating an example of UL transmission power in a UE according to the second embodiment; FIG. FIG. 32 is a diagram illustrating an example of UL transmission power in a UE according to the second embodiment;

A mobile communication system according to an embodiment will be described with reference to the drawings. In the description of the drawings, the same or similar parts are denoted by the same or similar reference numerals.

In one cell of the base station, when a separate initial BWP is set in addition to the conventional initial BWP, the base station transmits CD-SSB in the conventional initial DL BWP and non It is conceivable to transmit cell-defined SSB (Non-CD-SSB).

In the existing 3GPP technical specifications, when SSB is used for PUCCH beam control, an SSB index is set in the user equipment on the assumption that there is only one SSB in the serving cell. However, if only one SSB is transmitted in the serving cell, there is no problem, but in addition to CD-SSB, when Non-CD-SSB is transmitted in the cell, which SSB the user equipment uses for PUCCH beam control There is a problem of not knowing whether to use it or not.

Therefore, the present disclosure provides a user equipment, base station, and communication that enable appropriate control of PUCCH transmission even when Non-CD-SSB is transmitted in a cell in addition to CD-SSB The purpose is to provide a method.

[First embodiment]
(Configuration of mobile communication system)
A configuration of a mobile communication system 1 according to an embodiment will be described with reference to FIG. The mobile communication system 1 is, for example, a system conforming to 3GPP Technical Specifications (TS). Hereinafter, as the mobile communication system 1, a mobile communication system based on the 3GPP standard 5th Generation System (5GS), that is, NR (New Radio) will be described as an example.

The mobile communication system 1 has a network 10 and user equipment (UE) 100 communicating with the network 10 . The network 10 includes an NG-RAN (Next Generation Radio Access Network) 20, which is a 5G radio access network, and a 5GC (5G Core Network) 30, which is a 5G core network.

UE 100 is a communication device that communicates via base station 200 . UE 100 is a device used by a user. The UE 100 is, for example, a portable device such as a mobile phone terminal such as a smart phone, a tablet terminal, a notebook PC, a communication module, or a communication card. The UE 100 may be a vehicle (eg, car, train, etc.) or a device provided therein. The UE 100 may be a transport body other than a vehicle (for example, a ship, an airplane, etc.) or a device provided thereon. The UE 100 may be a sensor or a device attached thereto. Note that the UE 100 includes a mobile station, a mobile terminal, a mobile device, a mobile unit, a subscriber station, a subscriber terminal, a subscriber device, a subscriber unit, a wireless station, a wireless terminal, a wireless device, a wireless unit, a remote station, and a remote terminal. , remote device, or remote unit.

In the embodiment, two types of UEs are assumed as NR UEs 100: a general UE (Non-RedCap UE) 100A and a specific UE (RedCap UE) 100B having reduced communication capacity compared to the general UE 100A. The general UE 100A has advanced communication capabilities such as high-speed, large-capacity (enhanced mobile broadband: eMBB) and ultra-reliable and low-latency communications (URLLC), which are features of NR. Therefore, the general UE 100A has higher communication capability than the specific UE 100B. The general UE 100A may be an existing UE, that is, a UE prior to release 16 of the 3GPP technical specifications (so-called legacy UE).

The specific UE 100B is a UE with reduced device cost and complexity compared to the general UE 100A. The specific UE 100B is a UE 100 having middle-range performance and price for IoT. For example, compared to the general UE 100A, the maximum bandwidth used for wireless communication is set narrower, and the number of receivers is smaller. . Note that the receiver is sometimes called a reception branch. The specific UE 100B is sometimes called a Reduced capability NR device. Hereinafter, when the general UE 100A and the specific UE 100B are not distinguished, they are simply referred to as UE 100.

The specific UE 100B complies with the LPWA (Low Power Wide Area) standard, for example, the LTE (Long Term Evolution) Cat. 1/1bis, LTE Cat. M1 (LTE-M), LTE Cat. It may be possible to communicate at a communication speed equal to or higher than the communication speed specified by NB1 (NB-IoT). The specific UE 100B may be able to communicate with a bandwidth equal to or greater than the bandwidth defined by the LPWA standard. The specific UE 100B may have a limited bandwidth for communication compared to UEs of Release 15 or Release 16 of the 3GPP technical specifications. For example, for FR1 (Frequency Range 1), the maximum bandwidth (also referred to as UE maximum bandwidth) supported by a particular UE 100B may be 20 MHz. Also, for FR2 (Frequency Range 2), the maximum bandwidth supported by the specific UE 100B may be 100 MHz. The specific UE 100B may have only one receiver that receives radio signals. The specific UE 100B may be, for example, a wearable device, a sensor device, or the like.

NG-RAN 20 includes multiple base stations 200 . Each base station 200 manages at least one cell. A cell constitutes the minimum unit of a communication area. For example, one cell belongs to one frequency (carrier frequency) and is configured by one component carrier. The term “cell” may represent a radio communication resource and may also represent a communication target of UE 100 . Each base station 200 can perform radio communication with the UE 100 residing in its own cell. The base station 200 communicates with the UE 100 using the RAN protocol stack. Base station 200 provides NR user plane and control plane protocol termination towards UE 100 and is connected to 5GC 30 via NG interface. Such an NR base station 200 is sometimes referred to as a gNodeB (gNB).

The 5GC 30 includes a core network device 300. The core network device 300 includes, for example, AMF (Access and Mobility Management Function) and/or UPF (User Plane Function). AMF performs mobility management of UE100. UPF provides functions specialized for user plane processing. The AMF and UPF are connected with the base station 200 via the NG interface.

A configuration example of a protocol stack in the mobile communication system 1 according to the embodiment will be described with reference to FIG.

The protocol of the radio section between the UE 100 and the base station 200 includes a physical (PHY) layer, a MAC (Medium Access Control) layer, an RLC (Radio Link Control) layer, a PDCP (Packet Data Convergence Protocol) layer, It has an RRC (Radio Resource Control) layer.

The PHY layer performs encoding/decoding, modulation/demodulation, antenna mapping/demapping, and resource mapping/demapping. Data and control information are transmitted between the PHY layer of the UE 100 and the PHY layer of the base station 200 via physical channels.

A physical channel is composed of multiple OFDM (Orthogonal Frequency Division Multiplexing) symbols in the time domain and multiple subcarriers in the frequency domain. One subframe consists of a plurality of OFDM symbols in the time domain. A resource block (RB) is a resource allocation unit, and is composed of multiple OFDM symbols and multiple subcarriers. Specifically, in 5G systems, downlink and uplink transmissions are organized within a radio frame of 10 ms duration.

For example, a radio frame consists of 10 subframes. For example, one subframe may be 1 ms. Also, one subframe may consist of one or more slots. For example, the number of symbols forming one slot is 14 for a normal CP (Cyclic Prefix) and 12 for an extended CP. Also, the number of slots forming one subframe changes according to the set subcarrier interval. For example, for normal CP, if the subcarrier spacing is set to 15 kHz, the number of slots per subframe is 1 (i.e., 14 symbols), and if the subcarrier spacing is set to 30 kHz, the subframe If the number of slots per subframe is 2 (i.e. 28 symbols) and the subcarrier spacing is set to 60kHz, the number of slots per subframe is 4 (i.e. 56 symbols) and the subcarrier spacing is 120kHz. is set, the number of slots per subframe is 8 (ie, 128 symbols). Also, when 60 kHz is set as the subcarrier spacing for the extended CP, the number of slots per subframe is 4 (that is, 48 symbols).

Among physical channels, the physical downlink control channel (PDCCH) plays a central role, for example, for purposes such as downlink scheduling assignments, uplink scheduling grants, and transmission power control. For example, the UE100 is C -RNTI (Cell -Radio Network Temporary Identifier) and MCS -C -RNTI (MCS -C -RNTI) assigned from base station 200 to UE100. EME -C -RNTI), or CS -RNTI (CONFIGURED SCHEDULING- RNTI) is used to blind-decode the PDCCH, and the successfully decoded DCI is acquired as the DCI addressed to the own UE. Here, the DCI transmitted from the base station 200 is added with CRC parity bits scrambled by C-RNTI and MCS-C-RNTI or CS-RNTI.

The UE 100 can use a bandwidth narrower than the system bandwidth (that is, the cell bandwidth). The base station 200 configures the UE 100 with a bandwidth part (BWP) made up of consecutive PRBs. UE 100 transmits and receives data and control signals on the active BWP. Each BWP may have different subcarrier spacing and may overlap each other in frequency. If multiple BWPs are configured for the UE 100, the base station 200 can specify which BWP to activate through downlink control. This allows the base station 200 to dynamically adjust the UE bandwidth according to the amount of data traffic of the UE 100, etc., and reduce UE power consumption.

For example, the base station 200 can configure up to 3 control resource sets (CORESET) for each of up to 4 BWPs on the serving cell. CORESET is a radio resource for control information that the UE 100 should receive. UE 100 may be configured with up to 12 CORESETs on the serving cell. Each CORESET has an index from 0 to 11. For example, a CORESET consists of 6 resource blocks (PRBs) and 1, 2 or 3 consecutive OFDM symbols in the time domain.

The MAC layer performs data priority control, retransmission processing by hybrid ARQ (HARQ: Hybrid Automatic Repeat reQuest), random access procedures, and the like. Data and control information are transmitted between the MAC layer of the UE 100 and the MAC layer of the base station 200 via transport channels. The MAC layer of base station 200 includes a scheduler. The scheduler determines uplink and downlink transport formats (transport block size, modulation and coding scheme (MCS)) and allocation resources to the UE 100 .

The RLC layer uses the functions of the MAC layer and PHY layer to transmit data to the RLC layer on the receiving side. Data and control information are transmitted between the RLC layer of the UE 100 and the RLC layer of the base station 200 via logical channels.

The PDCP layer performs header compression/decompression and encryption/decryption.

An SDAP (Service Data Adaptation Protocol) layer may be provided as an upper layer of the PDCP layer. The SDAP (Service Data Adaptation Protocol) layer performs mapping between an IP flow, which is the unit of QoS (Quality of Service) control performed by the core network, and a radio bearer, which is the unit of AS (Access Stratum) QoS control.

The RRC layer controls logical channels, transport channels and physical channels according to radio bearer establishment, re-establishment and release. RRC signaling for various settings is transmitted between the RRC layer of UE 100 and the RRC layer of base station 200 . When there is an RRC connection between the RRC of UE 100 and the RRC of base station 200, UE 100 is in the RRC connected state. If there is no RRC connection between the RRC of the UE 100 and the RRC of the base station 200, the UE 100 is in RRC idle state. When the RRC connection between the RRC of UE 100 and the RRC of base station 200 is suspended, UE 100 is in RRC inactive state.

The NAS layer located above the RRC layer performs session management and mobility management for UE100. NAS signaling is transmitted between the NAS layer of the UE 100 and the NAS layer of the core network device 300 (AMF). Note that the UE 100 has an application layer and the like in addition to the radio interface protocol.

(BWP)
BWP is defined to reduce the power consumption of the UE 100 and effectively utilize broadband carriers. BWP includes initial BWP (initial DL BWP and initial UL BWP) and dedicated BWP (dedicated DL BWP and dedicated UL BWP). The UE 100 is configured with up to four DL BWPs and up to four UL BWPs in one serving cell according to its capabilities. In the following description, DL BWP and UL BWP are simply referred to as BWP when not distinguished from each other.

The initial BWP is a BWP that is used at least for initial access and is commonly used by multiple UEs 100 . Each of the initial DL BWP and the initial UL BWP is defined with a BWP identifier bwp-id of "0". The initial BWP includes the initial BWP derived and set by the master information block (MIB) transmitted on the PBCH, and the system information block (SIB), specifically set by the system information block type 1 (SIB1). There are two types: the initials BWP. The initial BWP set by the MIB has a bandwidth according to CORESET#0 which is set using parameters contained in the MIB. The initial BWP set by SIB1 is set by various parameters (locationAndBandwidth, subscriberSpacing, cyclicPrefix) included in ServingCellConfigCommonSIB, which is an information element in SIB1.

At the time of initial access to the cell, UE100 that has received the SSB of the cell, from the setting value of controlResourceSetZero (integer value from 0 to 15) in pdcch-ConfigSIB1 is an information element included in the PBCH (MIB), Type -0 Acquire the PDCCH CSS set bandwidth (24, 48, or 96 RBs). The UE 100 then monitors the Type-0 PDCCH CSS set to acquire SIB1, and acquires locationAndBandwidth, which is a parameter indicating the frequency position and/or bandwidth of the initial BWP, from SIB1. The UE 100 uses the initial BWP set by the MIB, that is, the bandwidth based on CORESET #0, for the initial BWP until it receives message 4 (Msg.4) in the random access procedure in the initial access. On the other hand, Msg. 4, the UE 100 uses the bandwidth set by locationAndBandwidth in SIB1 for the initial BWP. In addition, Msg. 4 may be the RRCSetup message, the RRCResume message, or the RRCReestablishment message. The UE 100 transitions from, for example, the RRC idle state to the RRC connected state by such initial access (random access procedure).

A dedicated BWP is a BWP that is set exclusively for a certain UE 100 (UE-specific). A bwp-id other than "0" may be set for the dedicated BWP. For example, a dedicated DL BWP and a dedicated UL BWP are set based on BWP-Downlink and BWP-Uplink, which are information elements included in the SavingcellConfig in the RRC message, which is dedicated signaling transmitted from the base station 200 to the UE 100. . For example, each of BWP-Downlink and BWP-Uplink may include various parameters (locationAndBandwidth, subsidiarySpacing, cyclicPrefix) for setting the BWP.

The base station 200 can notify the UE 100 of the BWP used for communication with the base station 200 (that is, the active BWP) among one or more set BWPs. For example, the base station 200 can transmit to the UE 100 a BWP identifier indicating the BWP to be activated when executing the configuration, that is, the BWP that is first used in communication with the base station 200 . In addition, for the control of switching from an active BWP to a BWP that is not an active BWP (hereinafter referred to as inactive BWP) and switching from an inactive BWP to an active BWP, for example, PDCCH (DCI), RRC signaling, MAC control element (MAC CE), or switching by a timer is used.

In addition, communication in the active BWP means transmission in the uplink shared channel (UL-SCH: Uplink-Shared Channel) in the BWP, transmission in the random access channel (RACH: Random Access Channel) in the BWP (physical random access channel (PRACH: Physical RACH) opportunity is set), monitoring of the physical downlink control channel (PDCCH: Physical Downlink Control Channel) in the BWP, physical uplink control channel (PUCCH: Physical Uplink Control Channel in the BWP ) (when the PUCCH resource is set), a report of channel state information (CSI: Channel State Information) for the BWP, and a downlink shared channel (DL-SCH: Downlink-Shared Channel) in the BWP may include at least one of receiving

Here, the UL-SCH is a transport channel and is mapped to a physical uplink shared channel (PUSCH: Physical Uplink Shared Channel). Data transmitted on the UL-SCH is also referred to as UL-SCH data. For example, it may correspond to UL-SCH data and uplink user data. DL-SCH is a transport channel and is mapped to a physical downlink shared channel (PDSCH: Physical Downlink Shared Channel). Data transmitted on the DL-SCH is also referred to as DL-SCH data. For example, it may correspond to DL-SCH data and downlink user data.

PUCCH is used to transmit uplink control information (UCI). For example, the uplink control information includes HARQ-ACK (Hybrid Automatic Repeat Request), CSI, and/or SR (Scheduling Request). HARQ-ACK includes positive acknowledgment or negative acknowledgment. For example, PUCCH is used to transmit HARQ-ACK for PDSCH (that is, DL-SCH (DL-SCH data, downlink user data)). Here, DL-SCH data and/or downlink user data are also referred to as downlink transport blocks.

UE 100 monitors, for example, a set of PDCCH candidates in one or more control resource sets (CORESET(s): Control Resource Set(s)) in an active DL BWP. PDCCH monitoring may include decoding each of the PDCCH candidates according to a monitored downlink control information (DCI) format. Here, the UE 100 may monitor a DCI format to which a CRC (Cyclic Redundancy Check, also referred to as a CRC parity bit) scrambled by an RNTI (Radio Network Temporary Identifier) set by the base station 200 is added. . Here, RNTI is SI-RNTI (System Information-RNTI), RA-RNTI (Random Access RNTI), TC-RNTI (Temporary C-RNTI), P-RNTI (Paging RNTI), and/or C-RNTI (Cell-RNTI) may be included. A set of PDCCH candidates monitored by the UE 100 may be defined as a PDCCH search space set. The search space set includes a common search space set (CSS set(s): Common Search Space set(s)) and/or a UE-specific search space set (USS set(s): UE Specific Search Space set(s)). It's okay. Therefore, the base station 200 configures the CORESET and/or search space set to the UE 100, and the UE 100 may monitor the PDCCH in the configured CORESET and/or search space set.

(SSB)
Base station 200 transmits SSB in initial DL BWP. For example, the SSB is composed of four consecutive OFDM symbols, in which a primary synchronization signal (PSS), a secondary synchronization signal (SSS), a PBCH (MIB), and a demodulation reference signal (DMRS) for the PBCH are arranged. The position of the resource element (time resource/frequency resource) to which the SSB is mapped is specified in the technical specifications of 3GPP, for example, "Section 7.4.3.1" of "TS38.211 v16.2.0" and "TS38 .213 v16.2.0, section 4.1. The bandwidth of SSB is, for example, 240 consecutive sub-carriers, ie a bandwidth of 20 RBs.

The SSB associated with SIB1 is called cell-specific SSB (CD-SSB). From the perspective of one UE 100, one serving cell is associated with one CD-SSB. In addition, SIB1 is also called RMSI (Remaining Minimum System Information). One CD-SSB corresponds to one cell with a unique NCGI (NR Cell Global Identifier). SSBs not associated with SIB1 (RMSI) are referred to as non-cell-specific SSBs (Non-CD-SSBs).

As shown in FIG. 3, the base station 200 notifies the UE 100 of the SSB being transmitted, for example, by the parameters (ssb-PositionsInBurst, ssb-periodicityServingCell) included in the information element ServingCellConfigCommonSIB in SIB1. ssb-PositionsInBurst indicates the time position of the SSB being transmitted within the half-frame (5 ms) SS burst. ssb-periodicityServingCell indicates the SSB transmission period.

Based on ssb-PositionsInBurst, the UE 100 can grasp the SSB of which SSB index is being transmitted. Specifically, the maximum number of SSBs in a half-frame (up to 64) is determined according to the subcarrier spacing and the frequency band, and the UE 100 can identify SSB candidate positions in the time domain based on the SSB index. Based on ssb-PositionsInBurst, UE 100 recognizes whether or not SSB is actually being transmitted at the candidate position. However, the SSB index is not associated with the frequency position on which the corresponding SSB is transmitted. Therefore, when multiple SSBs are transmitted in one cell, UE 100 cannot grasp the frequency position based on the SSB index.

(Separate initial BWP)
In 3GPP, assuming a specific UE 100B (RedCap UE), it is agreed to set an initial BWP (second initial BWP) for the specific UE 100B (RedCap UE) independently of the conventional initial BWP. Such a newly introduced initial BWP is called a separate initial BWP. A conventional initial BWP is a first initial BWP assuming a general UE 100 (Non-RedCap UE). The separate initials BWP are second initials BWP different from the first initials BWP.

The bandwidth of the separate initial BWP may be less than or equal to the maximum bandwidth of the specific UE 100B (RedCap UE). The frequency band of the separate initial BWP may be set so as not to overlap with the frequency band of the conventional initial BWP so as not to adversely affect UL transmission of the general UE 100 (Non-RedCap UE).

For example, the base station 200 transmits a parameter (for example, locationAndBandwidth) indicating the frequency position and/or bandwidth for each of the separate initial DL BWP and/or the separate initial UL BWP using SIB1. The subcarrier spacing and cyclic prefix parameters (for example, subcarrierSpacing, cyclicPrefix) for each of the separate initial DL BWP and/or the separate initial UL BWP may or may not be set. CORESET#0 does not have to be set in the separate initial DL BWP. Also, in the separate initial DL BWP, SIB1 does not have to be transmitted.

In the embodiment, it is assumed that SSB is transmitted in separate initial DL BWP. FIG. 4 shows an example of the relationship between SSB and initial BWP.

In the example shown in FIG. 4, the base station 200 (cell) transmits CD-SSB 501 within the frequency band of the first initial BWP 503 and transmits Non-CD-SSB 502 within the frequency band of the second initial BWP 504. The second initial BWP 504 is spaced apart from the first initial BWP 503 in the frequency domain. Since Non-CD-SSB 502 is transmitted in second initial BWP 504, specific UE 100B (RedCap UE) efficiently controls communication in second initial BWP 504 at the same frequency position based on Non-CD-SSB 502. becomes possible.

For example, assume that the specific UE 100B uses the measurement result for the CD-SSB 501 upon initial access with the second initial BWP 504. In this case, since the CD-SSB 501 and the second initial BWP 504 have different frequency bands, there is concern that the measurement results may differ from the actual radio quality of the second initial BWP 504 . On the other hand, when the specific UE 100B performs initial access with the second initial BWP504 based on the measurement results for the Non-CD-SSB502, since the frequency band is the same for the Non-CD-SSB502 and the second initial BWP504, Correct measurement results are available. Further, the specific UE 100B does not need to perform frequency switching (retuning) between the frequency band of the first initial BWP 503 and the frequency band of the second initial BWP 504.

Thus, in the embodiment, the base station 200 (cell) transmits CD-SSB 501 in the first initial BWP 503, which is the conventional initial DL BWP, and non-CD in the second initial BWP 504, which is the separate initial DL BWP. - Send SSB 502;

By the way, for UE 100, spatial setting is set by base station 200 for the purpose of PUCCH beam control. Such spatial setting includes a parameter for setting a signal to be referred to in PUCCH beam control, and can set an SSB index as the parameter. UE 100 for which an SSB index is set as a spatial setting for PUCCH transmission performs PUCCH transmission using the same spatial domain filter as the spatial domain filter used for reception of SSB indicated by the SSB index.

Also, for the purpose of beam control of sounding reference signals (SRS) transmitted from UE 100 to base station 200, spatial setting is set from base station 200 to UE 100. Such spatial settings include parameters for setting signals to be referred to in SRS beam control, and SSB indexes can be set as the parameters. UE 100 for which an SSB index is set as a spatial setting for SRS transmission performs SRS transmission using the same spatial domain filter as the spatial domain filter used for reception of SSB indicated by the SSB index.

Also, the UE 100 performs at least one of radio link monitoring (RLM) and beam failure detection (BFD) based on the reference signal received from the base station 200 . The base station 200 transmits to the UE 100 RLM reference signal configuration information for configuring reference signals used for at least one of RLM and BFD (hereinafter abbreviated as “RLM/BFD” as appropriate). Such configuration information includes parameters for configuring signals to be referenced in RLM/BFD, and SSB indexes can be configured as the parameters.

Also, the UE 100 performs path loss estimation for uplink transmission power control based on the reference signal received from the base station 200 . The base station 200 transmits to the UE 100 pathloss reference signal setting information for setting reference signals used for pathloss estimation. Such setting information includes a parameter for setting a signal to be referred to in pathloss estimation, and can set an SSB index as the parameter. UE 100 in which such an SSB index is set performs path loss estimation (calculation of path loss) using the SSB indicated by the SSB index.

According to existing 3GPP technical specifications, when SSB is used for PUCCH and/or SRS beam control, an SSB index is set in UE 100 on the assumption that there is only one SSB in the serving cell. However, there is no problem if only one SSB is transmitted in the serving cell, but in addition to CD-SSB 501, when Non-CD-SSB 502 is transmitted in the cell, UE 100 uses which SSB for PUCCH and / or SRS. It becomes unclear whether it should be used for beam control.

Similarly, in existing 3GPP technical specifications, when SSB is used for RLM/BFD, an SSB index is set in UE 100 on the assumption that there is only one SSB in the serving cell. However, if Non-CD-SSB 502 is transmitted in the cell in addition to CD-SSB 501, UE 100 will not know which SSB to use for RLM/BFD.

Similarly, in existing 3GPP technical specifications, when SSB is used for path loss estimation for uplink transmission power control, an SSB index is set in UE 100 on the assumption that there is only one SSB in the serving cell. However, if Non-CD-SSB 502 is transmitted in the cell in addition to CD-SSB 501, UE 100 will not know which SSB to use for pathloss estimation.

(Configuration of user device)
A configuration of the UE 100 according to the embodiment will be described with reference to FIG. The UE 100 may be a general UE 100A or a specific UE 100B. UE 100 includes communication unit 110 and control unit 120 .

The communication unit 110 performs wireless communication with the base station 200 by transmitting and receiving wireless signals to and from the base station 200 . The communication unit 110 has at least one transmitter 111 and at least one receiver 112 . The transmitter 111 and receiver 112 may be configured to include multiple antennas and RF circuits. The antenna converts a signal into radio waves and radiates the radio waves into space. Also, the antenna receives radio waves in space and converts the radio waves into signals. The RF circuitry performs analog processing of signals transmitted and received through the antenna. The RF circuitry may include high frequency filters, amplifiers, modulators, low pass filters, and the like.

The control unit 120 performs various controls in the UE 100. Control unit 120 controls communication with base station 200 via communication unit 110 . The operations of the UE 100 described above and below may be operations under the control of the control unit 120 . The control unit 120 may include at least one processor capable of executing a program and a memory that stores the program. The processor may execute a program to operate the control unit 120 . The control unit 120 may include a digital signal processor that performs digital processing of signals transmitted and received through the antenna and RF circuitry. The digital processing includes processing of the protocol stack of the RAN. Note that the memory stores programs executed by the processor, parameters related to the programs, and data related to the programs. The memory is ROM (Read Only Memory), EPROM (Erasable Programmable Read Only Memory), EEPROM (Electrically Erasable Programmable Read Only Memory), RAM (Random Access Mem ory) and flash memory. All or part of the memory may be included within the processor.

The UE 100 configured in this way receives the SSB transmitted in the initial BWP, which is part of the bandwidth of the cell of the base station 200 (serving cell). In UE 100 according to the first embodiment, transmission section 111 performs PUCCH transmission to base station 200 . Receiving section 112 receives, from base station 200, configuration information including an SSB index indicating an SSB to be referred to for controlling PUCCH transmission. Control section 120 refers to the SSB indicated by the SSB index included in the received configuration information to control PUCCH transmission. In the first embodiment, the receiving unit 112 receives setting information further including identification information for specifying whether the SSB indicated by the SSB index is CD-SSB 501 or Non-CD-SSB 502 . Thereby, the UE 100 can identify whether the SSB indicated by the set SSB index is CD-SSB 501 or Non-CD-SSB 502 based on the identification information. Therefore, even when Non-CD-SSB 502 is transmitted in a cell (serving cell) in addition to CD-SSB 501, it is possible to appropriately control PUCCH transmission.

Such configuration information may be spatial relationship configuration information that configures spatial settings for beam control for transmitting PUCCH. When the SSB indicated by the SSB index is identified as Non-CD-SSB502, control unit 120 performs PUCCH transmission using the same spatial domain filter as the spatial domain filter used to receive Non-CD-SSB502. Control. On the other hand, when the SSB indicated by the SSB index is identified as CD-SSB 501, control section 120 controls to perform PUCCH transmission using the same spatial domain filter as the spatial domain filter used for receiving CD-SSB 501. . Therefore, even when Non-CD-SSB 502 is transmitted in a cell (serving cell) in addition to CD-SSB 501, beam control of PUCCH transmission can be appropriately performed.

Also, in the UE 100 according to the first embodiment, the transmission section 111 performs SRS transmission to the base station 200 . Receiving section 112 receives, from base station 200, configuration information including an SSB index indicating an SSB to be referred to for controlling SRS transmission. The control unit 120 controls SRS transmission by referring to the SSB indicated by the SSB index included in the received configuration information. In the first embodiment, the receiving unit 112 receives setting information further including identification information for specifying whether the SSB indicated by the SSB index is CD-SSB 501 or Non-CD-SSB 502 . Thereby, the UE 100 can identify whether the SSB indicated by the set SSB index is CD-SSB 501 or Non-CD-SSB 502 based on the identification information. Therefore, even when Non-CD-SSB 502 is transmitted in a cell (serving cell) in addition to CD-SSB 501, SRS transmission can be appropriately controlled.

Note that SRS transmission refers to an operation in which the base station 200 transmits an SRS, which is an uplink physical signal for channel estimation used to estimate an uplink channel state, to the base station 200 . SRS transmission is performed according to the setting. That is, SRS transmission is an operation for uplink link adaptation. Link adaptation adapts the modulation and coding scheme (MCS) applied to data transmission to channel conditions.

Such configuration information may be spatial relationship configuration information that configures spatial settings for beam control for transmitting SRS. When the SSB indicated by the SSB index is identified as Non-CD-SSB 502, control section 120 performs SRS transmission using the same spatial domain filter as the spatial domain filter used for receiving Non-CD-SSB 502. Control. On the other hand, when the SSB indicated by the SSB index is identified as CD-SSB 501, control section 120 controls to perform SRS transmission using the same spatial domain filter as the spatial domain filter used for receiving CD-SSB 501. . Therefore, even when non-CD-SSB 502 is transmitted in a cell (serving cell) in addition to CD-SSB 501, beam control for SRS transmission can be appropriately performed.

Also, in the UE 100 according to the first embodiment, the receiving section 112 receives from the base station 200 configuration information including an SSB index indicating an SSB to be referenced for performing RLM/BFD. The control unit 120 performs RLM/BFD by referring to the SSB indicated by the SSB index included in the received configuration information. In the first embodiment, the receiving unit 112 receives setting information further including identification information for specifying whether the SSB indicated by the SSB index is CD-SSB 501 or Non-CD-SSB 502 . Thereby, the UE 100 can identify whether the SSB indicated by the set SSB index is CD-SSB 501 or Non-CD-SSB 502 based on the identification information. Therefore, even when Non-CD-SSB 502 is transmitted in a cell (serving cell) in addition to CD-SSB 501, it is possible to perform RLM/BFD appropriately.

Note that the RLM/BFD includes, for example, a process of monitoring the reception state of the reference signal in the PHY layer of the UE 100 and detecting a failure event (for example, loss of synchronization). The UE 100 counts failure event notifications sent from the PHY layer to the MAC layer using a counter, and detects radio link failure or beam failure when the count value reaches a specified number of times or more within a predetermined time. When the SSB index is configured in the configuration information, UE 100 performs RLM/BFD using SSB.

Such configuration information may be RLM reference signal configuration information that configures reference signals used for at least one of RLM and BFD. When determining that the SSB indicated by the SSB index is the Non-CD-SSB 502, the control unit 120 uses the Non-CD-SSB 502 to perform RLM/BFD. On the other hand, when the control unit 120 identifies that the SSB indicated by the SSB index is the CD-SSB 501, the CD-SSB 501 is used to perform RLM/BFD. Therefore, even when Non-CD-SSB 502 is transmitted in a cell (serving cell) in addition to CD-SSB 501, it is possible to perform RLM/BFD appropriately.

Also, in the UE 100 according to the first embodiment, the receiving unit 112 receives from the base station 200 configuration information including an SSB index indicating an SSB to be referenced for path loss estimation for uplink (UL) transmission power control. do. The control unit 120 performs path loss estimation by referring to the SSB indicated by the SSB index included in the configuration information. In the first embodiment, the receiving unit 112 receives setting information further including identification information for specifying whether the SSB indicated by the SSB index is CD-SSB 501 or Non-CD-SSB 502 . Thereby, the UE 100 can identify whether the SSB indicated by the set SSB index is CD-SSB 501 or Non-CD-SSB 502 based on the identification information. Therefore, even when Non-CD-SSB 502 is transmitted in a cell (serving cell) in addition to CD-SSB 501, path loss estimation can be performed appropriately.

Such setting information may be pathloss reference signal setting information for setting reference signals used for pathloss estimation. When the SSB indicated by the SSB index is identified as Non-CD-SSB 502, control section 120 uses Non-CD-SSB 502 to perform path loss estimation. On the other hand, when the SSB indicated by the SSB index is identified as CD-SSB501, control section 120 uses CD-SSB501 to perform path loss estimation. Therefore, even when Non-CD-SSB 502 is transmitted in a cell (serving cell) in addition to CD-SSB 501, path loss estimation can be performed appropriately.

Here, the CD-SSB 501 may be the SSB transmitted in the first initial BWP 503 (that is, the conventional initial DL BWP) of the cell (serving cell). Non-CD-SSB 502 may be SSB transmitted in a second initial BWP 504 (that is, a separate initial DL BWP) different from the first initial BWP 503 in the cell (serving cell). Thus, since Non-CD-SSB502 is transmitted in the second initial BWP504, the UE 100 efficiently controls the communication in the second initial BWP504 in the same frequency position based on the Non-CD-SSB502. becomes possible.

The first initial BWP 503 may be an initial BWP for general UE 100A (that is, Non-RedCap UE). The second initial BWP 504 may be an initial BWP for a specific UE 100B (that is, RedCap UE) whose communication capacity is reduced compared to the general UE 100A. This enables the specific UE 100B (RedCap UE) to efficiently control communication in the second initial BWP504 located at the same frequency position based on the Non-CD-SSB502.

In the first embodiment, the identification information may be frequency information indicating the frequency position where the SSB indicated by the SSB index is transmitted. The frequency information may be a frequency identifier, eg, an Absolute Radio-Frequency Channel Number (ARFCN). The frequency information may be RB numbers indicating radio resource locations in the frequency domain. Thereby, the UE 100 can grasp the frequency position where the SSB indicated by the SSB index is transmitted based on the frequency information as the identification information, and can appropriately receive the SSB indicated by the SSB index.

In the first embodiment, the identification information may be a BWP identifier (bwp-id) indicating the downlink BWP in which the SSB indicated by the SSB index is transmitted. If it is assumed that the BWP to which the CD-SSB 501 is sent and the BWP to which the Non-CD-SSB 502 is sent are necessarily different, the BWP identifier is suitable as identification information. The BWP identifier can be configured with a smaller amount of information (that is, a shorter bit length) than the information indicating the frequency position described above.

In the first embodiment, the identification information may be an SSB type identifier indicating either CD-SSB 501 or Non-CD-SSB 502 as the SSB type indicated by the SSB index. Assuming that the information necessary for the UE 100 to receive the Non-CD-SSB 502, such as the frequency to which the Non-CD-SSB 502 is sent, is set separately, the SSB type identifier is suitable as the identification information. The SSB type identifier may be 1-bit flag information such as "0" for CD-SSB 501 and "1" for Non-CD-SSB 502, for example. As a result, the identification information can be configured with a small amount of information.

(Base station configuration)
The configuration of the base station 200 according to the embodiment will be described with reference to FIG. Base station 200 has communication unit 210 , network interface 220 , and control unit 230 .

For example, the communication unit 210 receives radio signals from the UE 100 and transmits radio signals to the UE 100. The communication unit 210 has at least one transmitter 211 and at least one receiver 212 . The transmitting section 211 and the receiving section 212 may be configured including an RF circuit. The RF circuitry performs analog processing of signals transmitted and received through the antenna. The RF circuitry may include high frequency filters, amplifiers, modulators, low pass filters, and the like.

The network interface 220 transmits and receives signals to and from the network. The network interface 220, for example, receives signals from adjacent base stations connected via an Xn interface, which is an interface between base stations, and transmits signals to adjacent base stations. Also, the network interface 220 receives signals from the core network device 300 connected via the NG interface, for example, and transmits signals to the core network device 300 .

The control unit 230 performs various controls in the base station 200. The control unit 230 controls communication with the UE 100 via the communication unit 210, for example. Also, the control unit 230 controls communication with nodes (for example, adjacent base stations, core network device 300) via the network interface 220, for example. The operations of the base station 200 described above and below may be operations under the control of the control unit 230 . The control unit 230 may include at least one processor capable of executing programs and a memory storing the programs. The processor may execute a program to operate the controller 230 . Control unit 230 may include a digital signal processor that performs digital processing of signals transmitted and received through the antenna and RF circuitry. The digital processing includes processing of the protocol stack of the RAN. Note that the memory stores programs executed by the processor, parameters related to the programs, and data related to the programs. All or part of the memory may be included within the processor.

The base station 200 according to the first embodiment manages the cell (serving cell) in which the UE 100 is located. Transmitter 211 transmits SSB in initial BWP. Receiving section 212 receives PUCCH (UCI) from UE 100 located in the cell (serving cell). In the first embodiment, the transmitting unit 211, the SSB index indicating the SSB to be referred to by the UE 100 to control the transmission of the PUCCH, and the SSB indicated by the SSB index is either CD-SSB501 or Non-CD-SSB502 and setting information including identification information for specifying whether or not is transmitted to the UE 100. This allows the UE 100 to appropriately control PUCCH transmission even when Non-CD-SSB 502 is transmitted in the cell (serving cell) in addition to CD-SSB 501 .

Also, in the base station 200 according to the first embodiment, the receiving unit 212 receives SRS from the UE 100 located in the cell (serving cell). Transmitting section 211 includes an SSB index indicating an SSB that UE 100 refers to for controlling SRS transmission, and an identification for specifying whether the SSB indicated by the SSB index is CD-SSB 501 or Non-CD-SSB 502. and the setting information including the information is transmitted to the UE 100 . This allows the UE 100 to appropriately control SRS transmission even when Non-CD-SSB 502 is transmitted in the cell (serving cell) in addition to CD-SSB 501 .

In addition, in the base station 200 according to the first embodiment, the transmitting section 111 transmits to the UE 100 configuration information including an SSB index indicating the SSB that the UE 100 refers to in order to perform RLM/BFD. The configuration information further includes identification information for specifying whether the SSB indicated by the SSB index is CD-SSB 501 or Non-CD-SSB 502 . This enables the UE 100 to appropriately perform RLM/BFD even when Non-CD-SSB 502 is transmitted in the cell (serving cell) in addition to CD-SSB 501.

Also, in the base station 200 according to the first embodiment, the transmitting unit 211 transmits to the UE 100 configuration information including an SSB index indicating an SSB that the UE 100 refers to in order to perform path loss estimation for uplink transmission power control. . The configuration information further includes identification information for specifying whether the SSB indicated by the SSB index is CD-SSB 501 or Non-CD-SSB 502 . Thereby, even when Non-CD-SSB502 is transmitted in the cell (serving cell) in addition to CD-SSB501, the UE 100 can appropriately perform path loss estimation for uplink transmission power control. Become.

(Example of operation according to the first embodiment)
An operation example of the mobile communication system 1 according to the first embodiment will be described. First, with reference to FIG. 7, an example of the SSB identification operation in the UE 100 according to the first embodiment will be described. In this operation, the UE 100 may be in the RRC connected state.

In step S11, the receiving unit 112 receives configuration information including the SSB index and identification information from the base station 200. The configuration information may be sent from the base station 200 to the UE 100 in UE-specific signaling, for example, an RRC message such as an RRC Reconfiguration message.

In step S12, the control unit 120 determines whether or not the identification information received in step S11 corresponds to the Non-CD-SSB502.

If the identification information received in step S11 corresponds to Non-CD-SSB 502 (step S12: YES), in step S13, control unit 120 determines that the SSB index received in step S11 is the SSB index of Non-CD-SSB. Identify there is.

If the identification information received in step S11 corresponds to CD-SSB 501 (step S12: NO), in step S14, control unit 120 identifies that the SSB index received in step S11 is the SSB index of CD-SSB 501. .

Note that when a plurality of pieces of configuration information each including an SSB index are configured from base station 200, control section 120 determines that the SSB index of CD-SSB 501 is based on the identification information corresponding to the SSB index for each configuration information. It may be specified whether it is the SSB index or the SSB index of the Non-CD-SSB 502 .

(1) PUCCH Transmission Beam Control Next, an example of PUCCH transmission beam control according to the first embodiment will be described with reference to FIG.

In step S101, the base station 200 transmits to the UE 100 spatial relationship setting information (PUCCH-SpatialRelationInfo) for setting spatial settings regarding beam control for transmitting PUCCH. UE 100 receives the spatial relationship setting information (PUCCH-SpatialRelationInfo).

Spatial relationship setting information (PUCCH-SpatialRelationInfo) specifies an SSB index indicating an SSB to be referred to for controlling PUCCH transmission, and whether the SSB indicated by the SSB index is CD-SSB 501 or Non-CD-SSB 502. and identification information for

The base station 200 may set multiple pieces of spatial relationship setting information (PUCCH-SpatialRelationInfo) in the UE 100. Each of the plurality of spatial relationship setting information (PUCCH-SpatialRelationInfo) may include a combination of SSB index and identification information. The base station 200 may activate/deactivate the spatial relationship setting information (PUCCH-SpatialRelationInfo) by transmitting PUCCH spatial relation Activation/Deactivation MAC CE to the UE 100.

In step S102, based on the identification information received in step S101, UE 100 identifies whether the SSB index corresponding to the identification information is the SSB index of CD-SSB 501 or the SSB index of Non-CD-SSB 502. do.

In step S103, the UE 100 receives the SSB identified in step S102 from the base station 200.

In step S104, the UE 100 performs beam control for PUCCH transmission using the SSB received in step S103. Specifically, the UE 100 for which an SSB index (ssb-Index) is set as a spatial setting for PUCCH transmission uses the same spatial domain filter as the spatial domain filter used for receiving the SSB of the ssb-Index for PUCCH transmission. apply to For example, ssb-Index is configured as a spatial setting for a PUCCH resource, and the UE 100 uses the same spatial domain filter as the spatial domain filter used for receiving the SSB of the ssb-Index when performing transmission on the PUCCH resource. Use a spatial domain filter.

In step S105, the UE 100 performs PUCCH transmission to the base station 200. Base station 200 receives PUCCH.

An example of the spatial relationship setting information (PUCCH-SpatialRelationInfo) 1101 according to the first embodiment will be described with reference to FIGS. 9 and 10. FIG. 9 and 10 show description examples in the 3GPP RRC layer technical specification "TS38.331".

Spatial relationship setting information (PUCCH-SpatialRelationInfo) 1101 may include a serving cell identifier (servingCellId) 1102 to which the spatial relationship setting information (PUCCH-SpatialRelationInfo) 1101 is applied. Spatial relationship setting information (PUCCH-SpatialRelationInfo) 1101 may include an SSB index (ssb-Index) 1103 as a setting of a reference signal (referenceSignal).

Spatial relationship setting information (PUCCH-SpatialRelationInfo) 1101 includes frequency information (ssbFrequency-r17) 1104, SSB subcarrier spacing (ssbSubcarrierSpacing-r17) 1105, BWP as identification information associated with SSB index (ssb-Index) 1103. At least one of an identifier (ssb-DL-BWP-r17) 1106 and an SSB type identifier (ssb-Type-r17) 1107 is included. Here "-r17" means that the information element is introduced in Release 17 of the 3GPP technical specifications, but may be introduced in Release 18 or later. The condition (Cond) under which such identification information is provided as mandatory is the condition (NCD-SSB) that Non-CD-SSB 502 is transmitted in the separate initial DL BWP set for the RedCap UE. good too.

(2) SRS Transmission Beam Control Next, an example of SRS transmission beam control according to the first embodiment will be described with reference to FIG.

In step S201, the base station 200 transmits to the UE 100 spatial relationship setting information (SRS-SpatialRelationInfo) for setting spatial settings regarding beam control for transmitting SRS. The UE 100 receives spatial relationship setting information (SRS-SpatialRelationInfo).

Spatial relationship setting information (SRS-SpatialRelationInfo) specifies an SSB index indicating an SSB to be referred to for controlling SRS transmission, and whether the SSB indicated by the SSB index is CD-SSB 501 or Non-CD-SSB 502. and identification information for

In step S202, based on the identification information received in step S201, UE 100 identifies whether the SSB index corresponding to the identification information is the SSB index of CD-SSB 501 or the SSB index of Non-CD-SSB 502. do.

In step S203, the UE 100 receives the SSB identified in step S202 from the base station 200.

In step S204, the UE 100 performs beam control for SRS transmission using the SSB received in step S203. Specifically, the UE 100 for which the SSB index (ssb-Index) is set as the spatial setting for SRS transmission uses the same spatial domain filter as the spatial domain filter used for receiving the SSB of the ssb-Index for SRS transmission. apply to For example, ssb-Index is set as a spatial setting for an SRS resource, and when the UE 100 performs transmission on the SRS resource, the spatial domain filter is the same as the spatial domain filter used for reception of the SSB of the ssb-Index. Use a spatial domain filter.

In step S205, the UE 100 performs SRS transmission to the base station 200. Base station 200 receives the SRS.

An example of the spatial relationship setting information (SRS-SpatialRelationInfo) according to the first embodiment will be described with reference to FIGS. 12 and 13. FIG. 12 and 13 show description examples in the 3GPP RRC layer technical specification "TS38.331".

Spatial relationship setting information (SRS-SpatialRelationInfo) 1201 is included in SRS settings (SRS-Config). Spatial relationship setting information (SRS-SpatialRelationInfo) 1201 may include a serving cell identifier (servingCellId) 1202 to which the spatial relationship setting information (SRS-SpatialRelationInfo) 1201 is applied. Spatial relationship setting information (SRS-SpatialRelationInfo) 1201 may include an SSB index (ssb-Index) 1203 as a setting of a reference signal (referenceSignal).

As identification information associated with the SSB index (ssb-Index) 1203, frequency information (ssbFrequency-r17) 1204, SSB subcarrier spacing (ssbSubcarrierSpacing-r17) 1205, BWP identifier (ssb-DL-BWP-r17) 1206, and SSB type identifier (ssb-Type-r17) 1207 are provided. The condition (Cond) under which such identification information is provided as mandatory is the condition (NCD-SSB) that Non-CD-SSB 502 is transmitted in the separate initial DL BWP set for the RedCap UE. good too.

(3) RLM/BFD Control Next, an example of RLM/BFD control according to the first embodiment will be described with reference to FIG.

In step S301, the base station 200 transmits RLM reference signal setting information (RadioLinkMonitoringRS) for setting reference signals used for RLM/BFD to the UE100. The UE 100 receives RLM reference signal configuration information (RadioLinkMonitoringRS).

The RLM reference signal configuration information (RadioLinkMonitoringRS) specifies an SSB index indicating an SSB to be referenced for performing RLM/BFD, and whether the SSB indicated by the SSB index is CD-SSB 501 or Non-CD-SSB 502. and identification information for.

In step S302, based on the identification information received in step S301, UE 100 identifies whether the SSB index corresponding to the identification information is the SSB index of CD-SSB 501 or the SSB index of Non-CD-SSB 502. do.

In step S303, the UE 100 receives the SSB identified in step S302 from the base station 200.

In step S304, the UE 100 performs RLM/BFD using the SSB received in step S303. The UE 100 may perform RLM on a cell-by-cell basis. When the UE 100 detects a radio link failure (RLF) by RLM, the UE 100 may perform processing to recover from the RLF. The UE 100 may perform BFD on a beam-by-beam basis within a cell. When the UE 100 detects a beam failure by BFD, the UE 100 may perform processing for recovery from the beam failure.

An example of the RLM reference signal setting information (RadioLinkMonitoringRS) according to the first embodiment will be described with reference to FIGS. 15 and 16 show description examples in the 3GPP RRC layer technical specification "TS38.331".

The RLM reference signal setting information (RadioLinkMonitoringRS) 1301 can set the purpose of the corresponding reference signal, that is, BFD (beamFailure), RLM (rlf), or both (both) as the detection target. RLM reference signal configuration information (RadioLinkMonitoringRS) 1301 may include an SSB index (ssb-Index) 1302 as a configuration of detection resource (detectionResource).

As identification information associated with the SSB index (ssb-Index) 1302, frequency information (ssbFrequency-r17) 1303, SSB subcarrier spacing (ssbSubcarrierSpacing-r17) 1304, BWP identifier (ssb-DL-BWP-r17) 1305, and an SSB type identifier (ssb-Type-r17) 1306 are provided. The condition (Cond) under which such identification information is provided as mandatory is the condition (NCD-SSB) that Non-CD-SSB 502 is transmitted in the separate initial DL BWP set for the RedCap UE. good too.

(4) UL Transmission Power Control Next, an example of UL transmission power control according to the first embodiment will be described with reference to FIG.

In step S401, the base station 200 transmits to the UE 100 pathloss reference signal setting information for setting reference signals used for pathloss estimation for UL transmission power control. UE 100 receives the pathloss reference signal configuration information. The target of UL transmission power control is at least one of PUCCH, PUSCH, and SRI (Service Request Indicator)-PUSCH.

The pathloss reference signal configuration information includes an SSB index indicating an SSB to be referenced for pathloss estimation, and identification information for specifying whether the SSB indicated by the SSB index is CD-SSB 501 or Non-CD-SSB 502. and including.

In step S402, based on the identification information received in step S401, UE 100 identifies whether the SSB index corresponding to the identification information is the SSB index of CD-SSB 501 or the SSB index of Non-CD-SSB 502. do.

In step S403, the UE 100 receives the SSB identified in step S402 from the base station 200.

In step S404, the UE 100 performs path loss estimation using the SSB received in step S403. For example, the UE 100 measures the reception power of the SSB received from the base station 200 in step S403, and estimates the path loss by subtracting the reception power from the transmission power of the SSB. Note that the UE 100 can grasp the SSB transmission power from the SSB transmission power information (ss-PBCH-BlockPower) transmitted from the base station 200, for example, in the system information.

In step S405, the UE 100 determines UL transmission power using the path loss estimated in step S404. A specific example of the calculation formula for determining the UL transmission power will be described later.

At step S406, the UE 100 transmits a UL signal to the base station 200 with the UL transmission power determined at step S405. The UL signal is at least one of PUCCH signal, PUSCH signal, and SRI-PUSCH signal.

An example of the pathloss reference signal setting information according to the first embodiment will be described with reference to FIGS. 18 to 21. FIG. 18 to 21 show description examples in the 3GPP RRC layer technical specification "TS38.331".

　Figures 18 and 19 show an example of setting information (PUCCH-PowerControl) for setting UE-specific parameters for PUCCH transmission power control. Configuration information (PUCCH-PowerControl) includes pathloss reference signal configuration information (PUCCH-PathlossReferenceRS-r17) 1401 . Pathloss reference signal configuration information (PUCCH-PathlossReferenceRS-r17) 1401 includes SSB index (ssb-Index-r16) 1406 when SSB (ssb-r17) is configured as the reference signal (referenceSignal-r17). Pathloss reference signal configuration information (PUCCH-PathlossReferenceRS-r17) 1401 includes frequency information (ssbFrequency-r17) 1402, SSB subcarrier spacing (ssbSubcarrierSpacing- r17) 1403, BWP identifier (ssb-DL-BWP-r17) 1404, and/or SSB type identifier (ssb-Type-r17) 1405 are provided. The condition (Cond) under which such identification information is provided as mandatory is the condition (NCD-SSB) that Non-CD-SSB 502 is transmitted in the separate initial DL BWP set for the RedCap UE. good too.

　Figures 20 and 21 show an example of setting information (PUSCH-PowerControl) for setting UE-specific parameters for PUSCH transmission power control. Configuration information (PUSCH-PowerControl) includes pathloss reference signal configuration information (PUSCH-PathlossReferenceRS-r17) 1501 . Pathloss reference signal configuration information (PUSCH-PathlossReferenceRS-r17) 1501 includes SSB index (ssb-Index-r16) 1506 when SSB (ssb-r17) is configured as the reference signal (referenceSignal-r17). Pathloss reference signal configuration information (PUSCH-PathlossReferenceRS-r17) 1501 includes frequency information (ssbFrequency-r17) 1502, SSB subcarrier spacing (ssbSubcarrierSpacing- r17) 1503, BWP identifier (ssb-DL-BWP-r17) 1504, and/or SSB type identifier (ssb-Type-r17) 1505 are provided. The condition (Cond) under which such identification information is provided as mandatory is the condition (NCD-SSB) that Non-CD-SSB 502 is transmitted in the separate initial DL BWP set for the RedCap UE. good too.

[Second embodiment]
Regarding the second embodiment, differences from the above-described first embodiment will be mainly described.

In the first embodiment described above, an example in which the UE 100 identifies whether the SSB indicated by the SSB index is the CD-SSB 501 or the Non-CD-SSB 502 based on the identification information from the base station 200 has been described. In contrast, in the second embodiment, the UE 100 uses such identification information (eg, identification information included in spatial relationship setting information (PUCCH-SpatialRelationInfo), identification information included in spatial relationship setting information (SRS-SpatialRelationInfo), information, identification information included in the RLM reference signal configuration information (RadioLinkMonitoringRS), and identification information included in the pathloss reference signal configuration information), the SSB indicated by the SSB index is CD-SSB 501 and Non-CD - Autonomously identify which of the SSBs 502 it is.

In the UE 100 according to the second embodiment, the transmitting section 111 performs PUCCH transmission to the base station 200. Receiving section 112 receives, from base station 200, configuration information including an SSB index indicating an SSB to be referred to for controlling PUCCH transmission. Control section 120 refers to the SSB indicated by the SSB index included in the received configuration information to control PUCCH transmission. In the second embodiment, when the UE 100 is a specific UE 100B whose communication capacity is reduced compared to the general UE 100A and a predetermined condition is satisfied, the SSB indicated by the SSB index is Non-CD- Identify it as SSB502. That is, UE 100 autonomously identifies which SSB indicated by the set SSB index is CD-SSB 501 or Non-CD-SSB 502 . Therefore, even when Non-CD-SSB 502 is transmitted in a cell (serving cell) in addition to CD-SSB 501, it is possible to appropriately control PUCCH transmission.

Predetermined conditions, the second initial BWP503 for the general UE100A and the second initial BWP504 for the specific UE100B is set in the cell (serving cell), and the second initial BWP504 on the condition that Non-CD-SSB502 is transmitted. be. That is, when Non-CD-SSB 502 is transmitted in second initial BWP 504, UE 100 (specific UE 100B) identifies that SSB indicated by the set SSB index is Non-CD-SSB 502. Note that the UE 100 (specific UE 100B) may ascertain whether or not the Non-CD-SSB 502 is being transmitted by monitoring (searching) the Non-CD-SSB 502 in the cell (serving cell). UE 100 (specific UE 100B) may grasp whether Non-CD-SSB 502 is transmitted based on the system information of the cell (serving cell).

The control unit 120 of the UE 100 may specify that the SSB indicated by the set SSB index is the CD-SSB 501 when the UE 100 is the specific UE 100B and the predetermined condition is not satisfied. For example, UE 100, in the cell (serving cell), if the second initial BWP504 is not set and / or if Non-CD-SSB502 is not transmitted, the SSB indicated by the set SSB index is CD-SSB501 may be specified as

In the UE 100 according to the second embodiment, the transmission section 111 performs SRS transmission to the base station 200. Receiving section 112 receives, from base station 200, configuration information including an SSB index indicating an SSB to be referred to for controlling SRS transmission. The control unit 120 controls SRS transmission by referring to the SSB indicated by the SSB index included in the received configuration information. In the second embodiment, when the UE 100 is a specific UE 100B whose communication capacity is reduced compared to the general UE 100A and a predetermined condition is satisfied, the SSB indicated by the SSB index is Non-CD- Identify it as SSB502. That is, UE 100 autonomously identifies which SSB indicated by the set SSB index is CD-SSB 501 or Non-CD-SSB 502 . Therefore, even when Non-CD-SSB 502 is transmitted in a cell (serving cell) in addition to CD-SSB 501, SRS transmission can be appropriately controlled.

In the UE 100 according to the second embodiment, the receiving section 112 receives from the base station 200 configuration information including SSB indexes indicating SSBs to be referred to for performing RLM/BFD. The control unit 120 performs RLM/BFD by referring to the SSB indicated by the SSB index included in the received configuration information. In the second embodiment, when the UE 100 is a specific UE 100B whose communication capacity is reduced compared to the general UE 100A and a predetermined condition is satisfied, the SSB indicated by the SSB index is Non-CD- Identify it as SSB502. That is, UE 100 autonomously identifies which SSB indicated by the set SSB index is CD-SSB 501 or Non-CD-SSB 502 . Therefore, even when Non-CD-SSB 502 is transmitted in a cell (serving cell) in addition to CD-SSB 501, it is possible to perform RLM/BFD appropriately.

In the UE 100 according to the second embodiment, the receiving section 112 receives from the base station 200 configuration information including SSB indexes indicating SSBs to be referenced for path loss estimation for uplink transmission power control. The control unit 120 performs path loss estimation by referring to the SSB indicated by the SSB index included in the received configuration information. In the second embodiment, when the UE 100 is a specific UE 100B whose communication capacity is reduced compared to the general UE 100A and a predetermined condition is satisfied, the SSB indicated by the SSB index is Non-CD- Identify it as SSB502. That is, UE 100 autonomously identifies which SSB indicated by the set SSB index is CD-SSB 501 or Non-CD-SSB 502 . Therefore, even when Non-CD-SSB 502 is transmitted in a cell (serving cell) in addition to CD-SSB 501, path loss estimation can be performed appropriately.

(Example of operation according to the second embodiment)
An operation example of the mobile communication system 1 according to the second embodiment will be described. First, with reference to FIG. 22, an example of the SSB specifying operation in the UE 100 according to the second embodiment will be described. Here, it is assumed that the UE 100 is the specific UE 100B. In this operation, the UE 100 may be in the RRC connected state.

In step S21, the receiving unit 112 receives configuration information including the SSB index and identification information from the base station 200. The configuration information may be sent from the base station 200 to the UE 100 in UE-specific signaling, for example, an RRC message such as an RRC Reconfiguration message.

At step S22, the control unit 120 determines whether or not a predetermined condition is satisfied. The predetermined condition is that the first initial BWP 503 for the general UE 100A and the second initial BWP 504 (separate initial DL BWP) for the specific UE 100B are set in the serving cell, and Non-CD-SSB 502 is transmitted in the second initial BWP 504. This is the condition.

When it is determined that the predetermined condition is satisfied (step S22: YES), in step S23, the control unit 120 identifies that the SSB index received in step S21 is the SSB index of Non-CD-SSB.

If it is determined that the predetermined condition is not satisfied (step S22: NO), in step S24, the control unit 120 identifies that the SSB index received in step S21 is the SSB index of the CD-SSB 501.

Note that when a plurality of pieces of configuration information each including an SSB index are configured from base station 200, control section 120 determines whether the SSB index is CD-CD based on whether a predetermined condition is satisfied for each configuration information. It may be specified whether it is the SSB index of SSB 501 or the SSB index of Non-CD-SSB 502 .

(1) PUCCH Transmission Beam Control Next, an example of PUCCH transmission beam control according to the second embodiment will be described with reference to FIG.

In step S111, the base station 200 transmits to the UE 100 spatial relationship setting information (PUCCH-SpatialRelationInfo) for setting spatial settings regarding beam control for transmitting PUCCH. UE 100 receives the spatial relationship setting information (PUCCH-SpatialRelationInfo).

Spatial relationship setting information (PUCCH-SpatialRelationInfo) includes an SSB index that indicates an SSB that is referenced to control PUCCH transmission. In the second embodiment, the spatial relationship setting information (PUCCH-SpatialRelationInfo) does not include identification information for specifying whether the SSB indicated by the SSB index is CD-SSB501 or Non-CD-SSB502. good.

In step S112, the UE 100 autonomously determines whether the set SSB index is the SSB index of the CD-SSB 501 or the SSB index of the Non-CD-SSB 502 based on whether a predetermined condition is satisfied. to be specified.

In step S103, the UE 100 receives the SSB identified in step S112 from the base station 200.

(2) SRS Transmission Beam Control Next, an example of SRS transmission beam control according to the second embodiment will be described with reference to FIG.

In step S211, the base station 200 transmits to the UE 100 spatial relationship setting information (SRS-SpatialRelationInfo) for setting spatial settings regarding beam control for transmitting SRS. The UE 100 receives spatial relationship setting information (SRS-SpatialRelationInfo).

Spatial relationship setting information (SRS-SpatialRelationInfo) includes an SSB index that indicates an SSB that is referenced to control SRS transmission. In the second embodiment, the spatial relationship setting information (SRS-SpatialRelationInfo) does not include identification information for specifying whether the SSB indicated by the SSB index is CD-SSB 501 or Non-CD-SSB 502. good.

In step S212, the UE 100 autonomously determines whether the set SSB index is the SSB index of the CD-SSB 501 or the SSB index of the Non-CD-SSB 502 based on whether a predetermined condition is satisfied. to be specified.

In step S203, the UE 100 receives the SSB identified in step S212 from the base station 200.

(3) RLM/BFD Control Next, an example of RLM/BFD control according to the second embodiment will be described with reference to FIG.

In step S311, the base station 200 transmits to the UE 100 RLM reference signal setting information (RadioLinkMonitoringRS) for setting reference signals used for RLM/BFD. The UE 100 receives RLM reference signal configuration information (RadioLinkMonitoringRS).

The RLM reference signal setting information (RadioLinkMonitoringRS) includes an SSB index indicating an SSB to be referenced for performing RLM/BFD. In the second embodiment, the RLM reference signal configuration information (RadioLinkMonitoringRS) may not include identification information for identifying whether the SSB indicated by the SSB index is CD-SSB501 or Non-CD-SSB502. .

In step S312, the UE 100 autonomously determines whether the set SSB index is the SSB index of the CD-SSB 501 or the SSB index of the Non-CD-SSB 502 based on whether a predetermined condition is satisfied. to be specified.

In step S303, the UE 100 receives the SSB identified in step S312 from the base station 200.

(4) UL Transmission Power Control Next, an example of UL transmission power control according to the second embodiment will be described with reference to FIG.

In step S411, the base station 200 transmits to the UE 100 pathloss reference signal setting information for setting reference signals used for pathloss estimation for UL transmission power control. UE 100 receives the pathloss reference signal configuration information. The target of UL transmission power control is at least one of PUCCH, PUSCH, and SRI (Service Request Indicator)-PUSCH.

The pathloss reference signal setting information includes an SSB index indicating an SSB to be referenced for pathloss estimation. The pathloss reference signal configuration information may not include identification information for specifying whether the SSB indicated by the SSB index is CD-SSB 501 or Non-CD-SSB 502 .

In step S412, the UE 100 autonomously determines whether the set SSB index is the SSB index of the CD-SSB 501 or the SSB index of the Non-CD-SSB 502 based on whether a predetermined condition is satisfied. to be specified.

In step S403, the UE 100 receives the SSB identified in step S412 from the base station 200.

In step S405, the UE 100 determines UL transmission power using the path loss estimated in step S404.

Here, an example of UL transmission power in the UE 100 according to the second embodiment will be described with reference to FIGS. 27 to 32. FIG. 27 to 32 show description examples in the 3GPP PHY layer technical specification “TS38.213”.

FIG. 27 shows a calculation formula for determining the PUSCH transmission power. Path loss (PL) is used in this calculation formula. For example, the UE 100 performs transmission power control such that the PUSCH transmission power increases as the path loss increases.

FIG. 28 shows an operation example of the UE 100 (specific UE 100B). In step S501, the specific UE 100B (RedCap UE) determines whether or not a predetermined condition is satisfied. Specifically, the specific UE 100B determines whether or not the second initial BWP 504 (separate initial DL BWP) is set and Non-CD-SSB 502 is transmitted in the second initial BWP 504. If the predetermined condition is satisfied, in step S502, the specific UE 100B is provided with pathloss reference signal configuration information (PUSCH-PathlossReferenceRS) and enableDefaultBeamPL-ForSRS, or the specific UE 100B is provided with a dedicated higher layer parameter (dedicated higher layer parameters) are provided. If pathloss reference signal configuration information (PUSCH-PathlossReferenceRS) and enableDefaultBeamPL-ForSRS are not provided, or if the specific UE 100B is not provided with dedicated higher layer parameters (dedicated higher layer parameters), in step S503, the specific UE 100B calculates the pathloss (PL) using the Non-CD-SSB 502 transmitted in the second initial BWP 504 (separate initial DL BWP) and indicated by the SSB index (SS/PBCH block index).

If the second initial BWP 504 (separate initial DL BWP) is not set and/or if the Non-CD-SSB 502 is not transmitted in the second initial BWP 504, the specific UE 100B proceeds to step S504.

In step S504, the UE 100 determines whether the pathloss reference signal configuration information (PUSCH-PathlossReferenceRS) and the enableDefaultBeamPL-ForSRS are not provided, or before the dedicated higher layer parameters are provided to the UE 100. judge. If pathloss reference signal configuration information (PUSCH-PathlossReferenceRS) and enableDefaultBeamPL-ForSRS are not provided, or before dedicated higher layer parameters are provided to UE 100, UE 100 acquires the MIB. Calculate the path loss (PL) using the SSB of the SSB index used for

FIG. 29 shows a calculation formula for determining PUCCH transmission power. Path loss (PL) is used in this calculation formula. For example, the UE 100 performs transmission power control such that PUCCH transmission power is increased as the path loss increases.

FIG. 30 shows an operation example of the UE 100 (mainly the specific UE 100B). In step S511, the specific UE 100B (RedCap UE) determines whether or not a predetermined condition is satisfied. Specifically, the specific UE 100B determines whether or not the second initial BWP 504 (separate initial DL BWP) is set and Non-CD-SSB 502 is transmitted in the second initial BWP 504. If the predetermined condition is satisfied, in step S512, the specific UE 100B is not provided with pathloss reference signal configuration information (PathlossReferenceRS), or the specific UE 100B is provided with dedicated higher layer parameters. determine whether it is before If the pathloss reference signal configuration information (PathlossReferenceRS) is not provided, or if the specific UE 100B is before the dedicated higher layer parameters (dedicated higher layer parameters), then in step S513, the specific UE 100B uses the second initial BWP 504 Calculate path loss (PL) using Non-CD-SSB 502 transmitted in (separate initial DL BWP) and indicated by SSB index (SS/PBCH block index).

If the second initial BWP 504 (separate initial DL BWP) is not set and/or if the Non-CD-SSB 502 is not transmitted in the second initial BWP 504, the specific UE 100B proceeds to step S514.

In step S514, the UE 100 determines whether the pathloss reference signal configuration information (PathlossReferenceRS) is not provided or before the dedicated higher layer parameters are provided to the UE 100. If the pathloss reference signal configuration information (PUCCH-PathlossReferenceRS) is not provided, or before the UE 100 is provided with dedicated higher layer parameters (dedicated higher layer parameters), the UE 100 is used to acquire the MIB Compute the pathloss (PL) using the SSB of the SSB index.

FIG. 31 shows a calculation formula for determining the SRS transmission power. Path loss (PL) is used in this calculation formula. For example, the UE 100 performs transmission power control such that the SRS transmission power increases as the path loss increases.

FIG. 32 shows an operation example of the UE 100 (specific UE 100B). In step S521, the specific UE 100B (RedCap UE) determines whether or not a predetermined condition is satisfied. Specifically, the specific UE 100B determines whether or not the second initial BWP 504 (separate initial DL BWP) is set and Non-CD-SSB 502 is transmitted in the second initial BWP 504. If the predetermined condition is satisfied, in step S522, the specific UE 100B is not provided with pathloss reference signal configuration information (PathlossReferenceRS) or SRS-PathlossReferenceRS-Id, or the specific UE 100B is provided with a dedicated higher layer parameter (dedicated higher layer parameters) are provided. If the pathloss reference signal configuration information (PathlossReferenceRS) or SRS-PathlossReferenceRS-Id is not provided, or before the dedicated higher layer parameters are provided to the specific UE 100B, in step S523, the specific UE 100B calculates the pathloss (PL) using the Non-CD-SSB 502 transmitted in the second initial BWP 504 (separate initial DL BWP) and indicated by the SSB index (SS/PBCH block index).

If the second initial BWP 504 (separate initial DL BWP) is not set and/or if the Non-CD-SSB 502 is not transmitted in the second initial BWP 504, the specific UE 100B proceeds to step S524.

In step S524, the UE 100 is provided with no pathloss reference signal configuration information (PathlossReferenceRS) or SRS-PathlossReferenceRS-Id, or before the dedicated higher layer parameters are provided to the specific UE 100B. judge. If pathloss reference signal configuration information (PathlossReferenceRS) or SRS-PathlossReferenceRS-Id is not provided, or before dedicated higher layer parameters are provided to UE 100, UE 100 acquires the MIB. Calculate the path loss (PL) using the SSB of the SSB index used for

[Other embodiments]
The second embodiment may be used in combination with the first embodiment described above. For example, the UE 100 performs the operation according to the second embodiment before receiving the identification information from the base station 200, and then performs the operation according to the first embodiment after receiving the identification information from the base station 200. good.

The operation sequences (and operation flows) in the above-described embodiments do not necessarily have to be executed in chronological order according to the order described in the flow diagrams or sequence diagrams. For example, the steps in the operations may be performed out of order or in parallel with the order illustrated in the flow diagrams or sequence diagrams. Also, some steps in the operation may be omitted and additional steps may be added to the process. Further, the operation sequences (and operation flows) in the above-described embodiments may be implemented independently, or two or more operation sequences (and operation flows) may be combined and implemented. For example, some steps of one operation flow may be added to another operation flow, or some steps of one operation flow may be replaced with some steps of another operation flow.

In the above-described embodiment, the mobile communication system 1 based on NR has been described as an example. However, the mobile communication system 1 is not limited to this example. The mobile communication system 1 may be a TS-compliant system of either LTE or another generation system (eg, 6th generation) of the 3GPP standard. Base station 200 may be an eNB that provides E-UTRA user plane and control plane protocol termination towards UE 100 in LTE. The mobile communication system 1 may be a system conforming to a TS of a standard other than the 3GPP standard. The base station 200 may be an IAB (Integrated Access and Backhaul) donor or an IAB node.

A program that causes a computer to execute each process performed by the UE 100 or the base station 200 may be provided. The program may be recorded on a computer readable medium. A computer readable medium allows the installation of the program on the computer. Here, the computer-readable medium on which the program is recorded may be a non-transitory recording medium. The non-transitory recording medium is not particularly limited, but may be, for example, a recording medium such as CD-ROM (Compact Disk Read Only Memory) or DVD-ROM (Digital Versatile Disc Read Only Memory). good. Also, circuits that execute each process performed by the UE 100 or the base station 200 may be integrated, and at least a part of the UE 100 or the base station 200 may be configured as a semiconductor integrated circuit (chipset, SoC (System On Chip)).

In the above embodiments, "transmit" may mean performing at least one layer of processing in the protocol stack used for transmission, or physically transmitting the signal wirelessly or by wire. It may mean sending to Alternatively, "transmitting" may mean a combination of performing the at least one layer of processing and physically transmitting the signal wirelessly or by wire. Similarly, "receive" may mean performing processing of at least one layer in the protocol stack used for reception, or physically receiving a signal wirelessly or by wire. may mean that Alternatively, "receiving" may mean a combination of performing the at least one layer of processing and physically receiving the signal wirelessly or by wire. Similarly, "obtain/acquire" may mean obtaining information among stored information, and may mean obtaining information among information received from other nodes. Alternatively, it may mean obtaining the information by generating the information. Similarly, "include" and "comprise" are not meant to include only the recited items, and may include only the recited items or in addition to the recited items. Means that it may contain further items. Similarly, in the present disclosure, "or" does not mean exclusive OR, but means logical OR.

Although the embodiments have been described in detail with reference to the drawings, the specific configuration is not limited to the above, and various design changes can be made without departing from the scope of the invention.

Although the present disclosure has been described with reference to examples, it is understood that the present disclosure is not limited to those examples or structures. The present disclosure also includes various modifications and modifications within the equivalent range. In addition, various combinations and configurations, as well as other combinations and configurations, including single elements, more, or less, are within the scope and spirit of this disclosure.

(Appendix)
Features related to the above-described embodiments are added.

(Appendix 1)
A user equipment (100) that receives a synchronization signal block (SSB) transmitted in an initial bandwidth part (BWP) that is part of the bandwidth of a cell of a base station (200),
a transmitting unit (111) that transmits a sounding reference signal (SRS) to the base station (200);
a receiving unit (112) that receives configuration information including an SSB index indicating the SSB that is referred to for controlling the SRS transmission from the base station (200);
a control unit (120) that controls the SRS transmission by referring to the SSB indicated by the SSB index included in the configuration information;
The receiving unit (112) receives the configuration information further including identification information for specifying whether the SSB indicated by the SSB index is a cell-defined SSB (501) or a non-cell-defined SSB (502). User Equipment (100).
(Appendix 2)
the cell-defined SSB (501) is the SSB transmitted in the first initial BWP (503) of the cell;
The user equipment (100) of Claim 1, wherein said non-cell defined SSB (502) is an SSB transmitted in said cell in a second initial BWP (504) different from said first initial BWP (503).
(Appendix 3)
The first initial BWP (503) is an initial BWP for general user equipment (100A),
The user device (100) according to appendix 1 or 2, wherein the second initial BWP (504) is an initial BWP for a specific user device (100B) whose communication capability is reduced compared to the general user device (100A). .
(Appendix 4)
The user apparatus (100) according to any one of appendices 1 to 3, wherein the identification information is information indicating a frequency position where the SSB indicated by the SSB index is transmitted.
(Appendix 5)
The user equipment (100) according to any one of appendices 1 to 3, wherein the identification information is a BWP identifier indicating a downlink BWP in which the SSB indicated by the SSB index is transmitted.
(Appendix 6)
The identification information is an SSB type identifier indicating either the cell-defined SSB (501) or the non-cell-defined SSB (502) as the type of the SSB indicated by the SSB index. 1. A user equipment (100) according to one.
(Appendix 7)
A user equipment (100) that receives a synchronization signal block (SSB) transmitted in an initial bandwidth part (BWP) that is part of the bandwidth of a cell of a base station (200),
a transmitting unit (111) that transmits a sounding reference signal (SRS) to the base station (200);
a receiving unit (112) that receives configuration information including an SSB index indicating the SSB that is referred to for controlling the SRS transmission from the base station (200);
a control unit (120) that controls the SRS transmission by referring to the SSB indicated by the SSB index included in the configuration information;
When the user device (100) is a specific user device (100B) whose communication capability is reduced compared to a general user device (100A) and a predetermined condition is satisfied, the control unit (120) A user equipment (100) identifying that said SSB indicated by said SSB index is a non-cell defined SSB (502).
(Appendix 8)
The predetermined condition is that a first initial BWP (503) for the general user equipment (100A) and a second initial BWP (504) for the specific user equipment (100B) are set in the cell, and User equipment (100) according to clause 7, provided that said non-cell defined SSB (502) is transmitted in an initial BWP (504).
(Appendix 9)
When the user equipment (100) is a specific user equipment (100B) and the predetermined condition is not satisfied, the control unit (120) controls that the SSB indicated by the SSB index is a cell-defined SSB (501). A user equipment (100) according to clause 7 or 8.
(Appendix 10)
10. The user equipment (100) according to any one of appendices 1 to 9, wherein said configuration information is spatial relationship configuration information for configuring spatial settings related to beam control for transmitting said SRS.
(Appendix 11)
When the control unit (120) identifies that the SSB indicated by the SSB index is the non-cell-defined SSB (502), The user equipment (100) according to any one of appendices 1 to 10, wherein the SRS transmission is controlled using a domain filter.
(Appendix 12)
A base station (200) that manages a cell,
a transmitter (211) for transmitting a synchronization signal block (SSB) in an initial bandwidth part (BWP), which is part of the bandwidth of the cell;
A receiving unit (212) that receives a sounding reference signal (SRS) from the user equipment (100) located in the cell,
The transmitting unit (211) generates an SSB index indicating the SSB that the user equipment (100) refers to in order to control the transmission of the SRS, and A base station (200) that transmits configuration information including identification information for specifying which one of the cell-defined SSBs (502) and the user equipment (100).
(Appendix 13)
1. A communication method for execution in a user equipment (100) receiving a synchronization signal block (SSB) transmitted in an initial bandwidth part (BWP) of a cell bandwidth of a base station (200), comprising:
a step of receiving configuration information from the base station (200) including an SSB index indicating the SSB to be referred to for controlling sounding reference signal (SRS) transmission (S201);
referring to the SSB indicated by the SSB index included in the configuration information and controlling the SRS transmission (S202, S203, S204);
A step (S205) of performing the SRS transmission to the base station (200),
The receiving step includes receiving the configuration information further including identification information for specifying whether the SSB indicated by the SSB index is a cell-defined SSB (501) or a non-cell-defined SSB (502). including communication methods.
(Appendix 14)
1. A communication method for execution in a user equipment (100) receiving a synchronization signal block (SSB) transmitted in an initial bandwidth part (BWP) of a cell bandwidth of a base station (200), comprising:
a step of receiving configuration information from the base station (200) including an SSB index indicating the SSB to be referred to for controlling sounding reference signal (SRS) transmission (S211);
referring to the SSB indicated by the SSB index included in the configuration information and controlling the SRS transmission (S212, S203, S204);
A step (S205) of performing the SRS transmission to the base station (200),
In the step of controlling, when the user device (100) is a specific user device (100B) whose communication capability is reduced compared to a general user device (100A) and a predetermined condition is satisfied, the SSB The SSB indicated by the index is a non-cell defined SSB (502)
A communication method, including a step (S212) of specifying that the

Claims

A communication device (100),
a transmission unit (111) that performs sounding reference signal (SRS) transmission;
a receiving unit (112) for receiving configuration information including an SSB index indicating a synchronization signal and a physical broadcast channel block (SSB) referred to for the SRS transmission from the base station (200);
A control unit (120) that controls the SRS transmission by referring to the SSB indicated by the SSB index,
The control unit (120) identifies the SSB indicated by the SSB index as the non-cell-defined SSB (502) when receiving an absolute radio frequency channel number indicating a frequency position where the non-cell-defined SSB is transmitted. A device (100).
2. The communication device (100) of claim 1, wherein the non-cell defined SSB (502) is transmitted in an initial BWP for RedCap user equipment in the cell of the base station.
When the communication device (100) is a RedCap user device and has not received an absolute radio frequency channel number indicating a frequency position where the non-cell defined SSB is transmitted, The communication device (100) of claim 1, wherein the SSB indicated by the SSB index is identified as a cell-defined SSB (501).
2. The communication device (100) of claim 1, wherein the configuration information includes spatial relationship configuration information regarding transmission of the SRS.
When the control unit (120) identifies that the SSB indicated by the SSB index is the non-cell-defined SSB (502), The communication device (100) according to claim 1, wherein the SRS transmission is controlled using a domain filter.
A base station (200),
a receiver (212) for receiving sounding reference signal (SRS) transmissions from the communication device (100);
a transmission unit (211) configured to transmit configuration information including an SSB index indicating a synchronization signal and a physical broadcast channel block (SSB) referenced for the SRS transmission to the communication device (100),
The transmitting unit (211) transmits an absolute radio frequency channel number indicating a frequency position where the non-cell defined SSB is transmitted, for specifying the SSB indicated by the SSB index as a non-cell defined SSB (502). A base station (200) that transmits to a communication device (100).
A communication method performed by a communication device (100), comprising:
performing a Sounding Reference Signal (SRS) transmission;
receiving from the base station (200) configuration information including an SSB index indicating a synchronization signal and a physical broadcast channel block (SSB) referenced for the SRS transmission;
and controlling the SRS transmission by referring to the SSB indicated by the SSB index;
The controlling step includes identifying the SSB indicated by the SSB index as the non-cell-defined SSB (502) when receiving an absolute radio frequency channel number indicating a frequency location on which the non-cell-defined SSB is transmitted. Communication method.
A communication method performed in a base station (200), comprising:
receiving a Sounding Reference Signal (SRS) transmission from a communication device (100);
a step of transmitting configuration information including an SSB index indicating a synchronization signal and a physical broadcast channel block (SSB) referenced for the SRS transmission to the communication device (100);
transmitting to the communication device (100) an absolute radio frequency channel number indicating a frequency position on which the non-cell defined SSB is transmitted, for identifying the SSB indicated by the SSB index as a non-cell defined SSB (502); and a communication method.