WO2023013548A1

WO2023013548A1 - Communication apparatus and communication control method

Info

Publication number: WO2023013548A1
Application number: PCT/JP2022/029309
Authority: WO
Inventors: 大輝前本; 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: 2021-08-05
Filing date: 2022-07-29
Publication date: 2023-02-09
Also published as: JP2023023409A

Abstract

A communication apparatus (100) comprises: a communication unit (120) that, after performing an uplink transmission in a first frequency band, performs an uplink transmission in a second frequency band which is different from the first frequency band; and a control unit (140) that, on the basis of a sub-carrier interval used in the uplink transmissions, determines a symbol number constituting a guard period for changing the frequency band from the first frequency band to the second frequency band.

Description

Communication device and communication control method

Cross-references to related applications

This application is based on and claims the benefit of priority from patent application number 2021-128929, filed on August 5, 2021, the entire contents of which are incorporated by reference. incorporated herein by.

The present disclosure relates to communication devices and communication control methods used in mobile communication systems.

In a fourth generation (4G) mobile communication system (4G system), when a communication device performs uplink transmission in a first frequency band and then performs uplink transmission in a second frequency band different from the first frequency band, A guard period is created for changing the frequency band from the first frequency band to the second frequency band (see Non-Patent Document 1). Thereby, the communication device performs the switching operation in the guard period.

The length of the guard period is the length of the number of symbols defined in advance. Let the last symbol of the transmission and/or the last symbol of the second uplink transmission be the guard period.

A communication apparatus according to a first aspect includes a communication unit that performs uplink transmission in a second frequency band different from the first frequency band after performing uplink transmission in a first frequency band, and a subcarrier interval used for the uplink transmission. and a control unit that determines the number of symbols for forming a guard period for changing the frequency band from the first frequency band to the second frequency band, based on:

A communication control method according to a second aspect is a communication control method executed by a communication device, wherein after performing uplink transmission in a first frequency band, uplink transmission is performed in a second frequency band different from the first frequency band. and determining the number of symbols for forming a guard period for changing the frequency band from the first frequency band to the second frequency band based on the subcarrier interval used for the uplink transmission; Prepare.

Objects, features, advantages, etc. of the present disclosure will become clearer from the following detailed description 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 illustrating a configuration example of a protocol stack according to the embodiment; FIG. 3 is a diagram illustrating the configuration of a UE according to the embodiment; FIG. 4 is a diagram showing the configuration of a base station according to the embodiment. FIG. 5 is a sequence diagram for explaining the first operation example of the mobile communication system according to the embodiment. FIG. 6 is an explanatory diagram for explaining a first operation example of the mobile communication system according to the embodiment. FIG. 7 is a sequence diagram for explaining a second operation example of the mobile communication system according to the embodiment. FIG. 8 is an explanatory diagram for explaining a second operation example of the mobile communication system according to the 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 the 4G system, the subcarrier spacing is fixed, whereas in the fifth generation (5G) mobile communication system (5G system), the subcarrier spacing (ie, symbol length) can be changed. Therefore, if a guard period is generated in the 5G system in the same way as in the 4G system, the length of the generated guard period may be inappropriate. Therefore, the present disclosure provides a communication device and communication control that can generate an appropriate guard period when performing uplink transmission in a second frequency band different from the first frequency band after performing uplink transmission in the first frequency band. One of the purposes is to provide a method.

(System configuration)
First, the configuration of a mobile communication system 1 according to this embodiment will be described with reference to FIG. The mobile communication system 1 is, for example, a system conforming to Technical Specifications (TS) of 3GPP (registered trademark; hereinafter the same) (3rd Generation Partnership Project). Hereinafter, as the mobile communication system 1, a mobile communication system based on the 3GPP standard 5th Generation System (5G system), that is, NR (New Radio) will be described as an example.

The mobile communication system 1 has a network 10 and a user equipment (UE) 100 that communicates 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.

The UE 100 is an example of a communication device. The UE 100 may be a mobile wireless communication device. UE 100 may be 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 (eg, Vehicle UE). The UE 100 may be a transport body other than a vehicle (eg, a ship, an airplane, a squadron, etc.) or a device provided thereon (eg, an Aerial UE). The UE 100 may be a sensor or a device attached thereto. UE 100 includes mobile station, mobile terminal, mobile device, mobile unit, subscriber station, subscriber terminal, subscriber device, subscriber unit, wireless station, wireless terminal, wireless device, wireless unit, remote station, remote terminal. , remote device, or remote unit.

In the present embodiment, as the UE 100 of NR, a general UE (general communication device, general user device) 100A and a specific UE (specific communication device, specific user device) 100B having communication capacity reduced compared to the general UE 100A Assume two types of UEs. 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 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 or a RedCap UE. Hereinafter, for clarity of explanation, a general UE or a specific UE is also described, but the general UE or the specific UE in this embodiment is a UE. That is, the general UE in this embodiment may be replaced with a UE. Also, the specific UE in this embodiment may be replaced with a UE.

Specifically, the specific UE 100B complies with the LPWA (Low Power Wide Area) standard, such as LTE Cat. (Long Term Evolution UE Category) 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 Rel-15 or Rel-16 UEs. 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. One cell belongs to one frequency (carrier frequency). 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. Details of the protocol stack will be described later. Base stations 200 are also connected to other base stations 200 (which may be referred to as adjacent base stations) via Xn interfaces. Base station 200 communicates with neighboring base stations via the Xn interface. The base station 200 also provides NR user plane and control plane protocol termination towards the UE 100 and is connected to the 5GC 30 via the 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 U-plane processing. The AMF and UPF are connected with the base station 200 via the NG interface.

(Example of protocol stack configuration)
Next, a configuration example of a protocol stack according to this embodiment will be described with reference to FIG.

The protocol of the wireless 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.

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 in the UE 100 performs session management and mobility management for the UE 100. NAS signaling is transmitted between the NAS layer of UE 100 and the NAS layer of core network device 300 .

Note that the UE 100 has an application layer and the like in addition to the radio interface protocol.

(Radio frame structure)
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 normal CP (Cyclic Prefix) and 12 for 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). That is, the number of slots forming one subframe is determined based on the subcarrier spacing set by base station 200 . Also, based on the subcarrier spacing set by base station 200, the number of symbols forming one subframe is determined. That is, based on the subcarrier interval set by base station 200, the number of symbols forming a 1 ms subframe is determined, and the length of each symbol (length in the time direction) changes.

(Bandwidth part)
UE 100 and base station 200 communicate using a bandwidth portion (BWP), which is a portion of the total bandwidth of a cell. Specifically, the base station 200 configures one or more BWPs for the UE100. 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. Specifically, the base station 200 can transmit to the UE 100 an identifier indicating the BWP to be activated when executing the setting, that is, the BWP that is first used in communication with the base station 200 . In addition, for controlling switching from an active BWP to a BWP that is not an active BWP (hereinafter referred to as an inactive BWP) and switching from an inactive BWP to an active BWP (so-called BWP switching), for example, a physical downlink control channel (e.g., downlink link assignment, uplink assignment), timer (ie bwp-InactivityTimer), RRC signaling, or MAC entity.

Here, communication in BWP (that is, active BWP) means transmission on the uplink shared channel (UL-SCH: Uplink-Shared Channel) in the BWP, and random access channel (RACH: Random Access Channel) in the BWP. Transmission of the 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 in the BWP ( PUCCH: Physical Uplink Control Channel) transmission (when PUCCH resource is configured), channel state information (CSI: Channel State Information) report for the BWP, and downlink shared channel (DL-SCH) in the BWP : Downlink-Shared Channel).

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.

Also, the PUCCH is used to transmit uplink control information. 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.

The BWP includes an initial bandwidth portion (initial BWP) and a bandwidth portion dedicated to each UE 100 (dedicated BWP). Initial BWP is used at least for initial access of UE 100 . The initial BWP is commonly used for multiple UEs 100 . For example, the initial BWP is set using parameters common to multiple UEs 100 (cell-specific parameters). The initial BWP includes an initial BWP for downlink communication (hereinafter referred to as initial downlink BWP (Initial DL BWP)) and an initial BWP for uplink communication (hereinafter referred to as initial uplink BWP (Initial UL BWP)). For example, the value of the identifier (ie, bwp-id) indicating each of the initial downlink BWP and the initial uplink BWP may be 0.

For example, the UE 100 can identify the initial BWP (that is, the initial downlink BWP and the initial uplink BWP) using two methods. In the first method, the UE 100 identifies the initial BWP based on CORESET#0, which is set using information contained in the master information block (MIB) within the physical broadcast channel (PBCH). In the second method, the UE 100 identifies the initial BWP based on the location and bandwidth in the frequency domain that are set using information included in the system information block (SIB). UE 100 may apply the BWP identified by the first method to communication with base station 200, for example, until reception of message 4 in the random access procedure. UE 100 may apply the BWP identified by the second method to communication with base station 200, for example, after receiving message 4 (Msg.4). Here, message 4 in the random access procedure may include an RRC setup message, an RRC resume message and/or an RRC (re)establishment message.

A dedicated BWP is set exclusively for the UE 100. The dedicated BWP includes a dedicated BWP for downlink communication (hereinafter referred to as a dedicated downlink BWP (UE dedicated DL BWP)) and a dedicated BWP for uplink communication (hereinafter referred to as a dedicated uplink BWP (UE dedicated UL BWP)). For example, the value of the identifier indicating each of the dedicated downlink BWP and the dedicated uplink BWP may be other than 0.

In the UE 100, for example, a dedicated BWP is configured based on information included in the RRC message (eg, information for BWP downlink (ie, BWP-Downlink) and information for uplink BWP (ie, BWP-Uplink)). be. For each of the information for downlink BWP and the information for dedicated uplink BWP, for example, information indicating the position and bandwidth in the frequency domain (eg, locationAndBadwidth), information indicating subcarrier spacing (eg, subcarrierSpacing), and extended size At least one of information indicating a click prefix (eg, cyclicPrefix) may be included.

(resource block)
A resource block (RB) is defined as 12 consecutive subcarriers in the frequency domain. As RBs, for example, common resource blocks (CRBs), physical resource blocks (PRBs), etc. are defined. The common resource blocks are numbered in ascending order from 0 in the frequency domain with a subcarrier spacing setting μ. The physical resource blocks (PRBs) of the subcarrier spacing setting μ are defined within the bandwidth portion and numbered from 0 to the following numbers (PRB numbers to be described later). Hereinafter, PRB numbers are also referred to as PRB indexes. That is, in this embodiment, the PRB number and the PRB index may be the same.

Also, the relationship between common resource blocks and physical resource blocks is given by the following equation.

(PUCCH resource)
For example, when receiving the first PUCCH configuration information but not receiving the second PUCCH configuration information, the UE 100 determines PUCCH resources in the initial uplink BWP based on predefined information. Here, when the first PUCCH configuration information and / or the second PUCCH configuration information is received, the UE 100 has the first PUCCH configuration information and / or the second PUCCH configuration information (that is, holds) may include Further, when the first PUCCH configuration information and / or the second PUCCH configuration information is not received, the UE 100 does not have the first PUCCH configuration information and / or the second PUCCH configuration information (that is, does not hold) may contain. Hereinafter, the case where the UE 100 receives the first PUCCH configuration information but does not receive the second PUCCH configuration information will also be referred to as the first case.

For example, the first PUCCH configuration information is PUCCH configuration common information (pucch-ConfigCommon). That is, the first PUCCH configuration information is a PUCCH cell-specific parameter. Also, for example, the second PUCCH configuration information is PUCCH configuration information (PUCCH-Config). That is, the second PUCCH configuration information is the UE specific parameters of PUCCH.

For example, an index (eg, an index from 0 to 15) is associated with each of a plurality of PUCCH resources (eg, 16 PUCCH resources), and by specifying the index using the first PUCCH configuration information, a certain one one PUCCH resource may be indicated. Here, each of the plurality of PUCCH resources may include at least one of the PUCCH format, the first symbol used for PUCCH, the period (number of symbols) used for PUCCH, the PRB offset, and the initial CS (cyclic shift) index. .

For example, in the first case, the UE 100 may determine the index by the following formula. Also, UE 100 determines a PUCCH resource based on the determined index.

Also, in the first case, the UE 100 may determine whether or not Equations 1 and 2 are satisfied. UE 100 is provided with PUCCH resources by the PUCCH resource common information, and if one of Equation 1 and Equation 2 is satisfied, UE 100 determines the PRB index of the PUCCH resource hopping in the frequency direction. That is, UE 100 determines PRB indices of one or more PUCCH resources used for frequency hopping applied to PUCCH transmission.

For example, when formula 1 is satisfied, UE 100 uses the following formula to calculate the PRB index of the PUCCH resource used for the first hop (first PUCCH resource) and the PUCCH resource used for the second hop (second PUCCH determine the PRB index of the resource); Here, the size of the initial uplink BWP in "Equation 5" may correspond to the size of the bandwidth portion i in "Equation 1". That is, the PRBs of the initial uplink BWP in "Formula 5" may correspond to the PRB numbers (indexes).

Further, when formula 2 is satisfied, UE 100 uses the following formula to calculate the PRB index of the PUCCH resource used for the first hop (first PUCCH resource) and the PUCCH resource used for the second hop (second PUCCH determine the PRB index of the resource);

Note that the UE 100 may determine the initial CS index within the initial CS index set by the following equation.

Also, when receiving the second PUCCH configuration information, the UE 100 determines PUCCH resources based on the second PUCCH configuration information. That is, when receiving the second PUCCH configuration information, UE 100 may determine PUCCH resources based on the second PUCCH configuration information regardless of whether or not the first PUCCH configuration information is received. Hereinafter, the case where the UE 100 receives at least the second PUCCH configuration information (that is, has the second PUCCH configuration information) will also be referred to as the second case.

For example, the second PUCCH configuration information includes PUCCH resource set information (PUCCH-ResourceSet), PUCCH resource identifier (pucch-ResourceId), starting PRB information (startingPRB), second hop PRB information (secondHopPRB), and intra-slot frequency hopping information. (intraSlotFrequencyHopping). For example, PUCCH resource set information indicates a PUCCH resource set. Also, the PUCCH resource identifier indicates a PUCCH resource index. Also, a PUCCH resource set is associated with a PUCCH resource index. Also, the start PRB information indicates the first PRB index before frequency hopping or without frequency hopping. Also, the second hop PRB information indicates the first PRB index after frequency hopping. Also, the intra-slot frequency hopping information indicates whether intra-slot frequency hopping is enabled or disabled. That is, in the second case, the UE 100 may determine the PUCCH resource (PRB index of the PUCCH resource) to be applied for PUCCH transmission based on the start PRB information and/or the second hop PRB information.

For example, in the second case, multiple PUCCH resource sets may be configured for the UE 100. For example, UE 100 determines a PUCCH resource set to be used for PUCCH transmission based on PUCCH resource set information and a PUCCH resource identifier. Also, UE 100 determines the first PRB before frequency hopping or without frequency hopping (that is, the PRB index of the PUCCH resource) based on the starting PRB information. Also, UE 100 determines the first PRB after frequency hopping (that is, the PRB index of the PUCCH resource) based on the second-hop PRB information. Also, the UE 100 determines whether intra-slot frequency hopping is enabled or disabled based on the intra-slot frequency hopping information. That is, UE 100 performs intra-slot frequency hopping when intra-slot frequency hopping is enabled. Also, the UE 100 does not perform intra-slot frequency hopping when intra-slot frequency hopping is disabled.

Note that the UE 100 may determine PUCCH resources using another method different from the method described above. For example, when receiving predetermined information (eg, useInterlace PUCCH-PUSCH), UE 100 may determine PUCCH resources by other methods.

Also, the UE 100 transmits PUCCH using the determined PUCCH resource. Note that UE 100 determines PRBs to which numbers corresponding to the determined indices of physical resource blocks (PRBs) are assigned as PRBs to be used for PUCCH transmission. That is, in the first case, UE 100 may perform PUCCH transmission with frequency hopping using PUCCH resources (eg, first PUCCH resource and second PUCCH resource) of the determined PRB index. Also, in the second case, the UE 100 uses the determined PUCCH resource of the PRB index (for example, the PUCCH resource determined based on the start PRB information and the PUCCH resource determined based on the second hop PRB information). may be used to perform PUCCH transmission with frequency hopping.

(Configuration of user device)
Next, the configuration of the UE 100 according to this embodiment will be described with reference to FIG. UE 100 includes communication unit 120 and control unit 140 .

The communication unit 120 performs wireless communication with the base station 200 by transmitting and receiving wireless signals to and from the base station 200 . The communication unit 120 has at least one receiver 121 and at least one transmitter 122 . The receiving section 121 and the transmitting section 122 may be configured including an antenna and an RF circuit. An 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 receiving unit 121 may be called a receiver (RX: Receiver). The transmitter 122 may be referred to as a transmitter (TX). When the UE 100 is the general UE 100A, the number of receivers included in the communication unit 120 may be two to four. When the UE 100 is the specific UE 100B, the number of receivers included in the communication unit 120 may be one or two.

The control unit 140 performs various controls in the UE 100. The control unit 140 controls communication with the base station 200 via the communication unit 120 . The operation of the UE 100, which will be described later, may be an operation under the control of the control unit 140. The control unit 140 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 140 . Control unit 140 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 may include at least one of ROM (Read Only Memory), EPROM (Erasable Programmable Read Only Memory), EEPROM (Electrically Erasable Programmable Read Only Memory), RAM (Random Access Memory), and flash memory. All or part of the memory may be included within the processor.

In the UE 100 configured as described above, the communication unit 120 performs uplink transmission in the first frequency band and then performs uplink transmission in the second frequency band different from the first frequency band. Control section 140 determines the number of symbols for forming a guard period for changing the frequency band from the first frequency band to the second frequency band, based on the subcarrier interval used for uplink transmission. Thereby, UE 100 can appropriately change the length of the guard period according to the subcarrier interval even if the subcarrier interval is not fixed. As a result, the UE 100 can generate an appropriate guard period when performing uplink transmission in the second frequency band different from the first frequency band after performing uplink transmission in the first frequency band.

Also, the communication unit 120 may receive from the base station 200 information indicating the subcarrier spacing of the bandwidth portion that is part of the total bandwidth of the cell of the base station 200 . Control section 140 may determine the number of symbols based on information indicating subcarrier intervals. Thereby, UE 100 can generate an appropriate guard period based on the subcarrier interval indicated by the information indicating the subcarrier interval received by base station 200 .

Also, the control unit 140 may determine the number of symbols based on the capability information indicating the capability of the UE 100. Depending on the capabilities of the UE 100, the time it takes to change the frequency (retuning or switching) may change. UE 100 can generate an appropriate guard period by determining the number of symbols based on its own capability.

Also, the communication unit 120 may transmit the capability information to the base station 200 . This allows the base station 200 to grasp the number of symbols determined by the UE 100 as the length of the guard period. As a result, the base station 200 can grasp the period during which the UE 100 does not perform uplink transmission.

Also, the control unit 140 may determine the number of symbols based on the combination of the channel used for uplink transmission in the first frequency band and the channel used for uplink transmission in the second frequency band. Depending on the combination of the channel used for uplink transmission in the first frequency band and the channel used for uplink transmission in the second frequency band, the time required for frequency change (retuning or switching) may vary. UE 100 can generate an appropriate guard period by determining the number of symbols based on the combination of channels.

Note that the operation of the functional unit (specifically, at least one of the communication unit 120 and the control unit 140) included in the UE 100 may be described as the operation of the UE 100.

(Base station configuration)
Next, the configuration of the base station 200 according to this embodiment will be described with reference to FIG. The base station 200 has a radio communication section 220 , a network communication section 230 and a control section 240 .

Under the control of the control unit 240, the wireless communication unit 220 communicates with the UE 100 via the antenna. The radio communication unit 220 has a receiving unit 221 and a transmitting unit 222 . The receiving section 221 converts a radio signal received by the antenna into a received signal that is a baseband signal, performs signal processing on the received signal, and outputs the received signal to the control section 240 . The transmission unit 222 performs signal processing on a transmission signal, which is a baseband signal output from the control unit 240, converts the signal into a radio signal, and transmits the radio signal from an antenna.

The network communication unit 230 transmits and receives signals to and from the network. The network communication unit 230, for example, receives signals from adjacent base stations connected via an Xn interface, which is an interface between base stations, and transmits signals to the adjacent base stations. Also, the network communication unit 230 receives a signal from the core network device 300 connected via the NG interface, for example, and transmits the signal to the core network device 300 .

The control unit 240 performs various controls in the base station 200. The control unit 240 controls communication with the UE 100 via the radio communication unit 220, for example. The control unit 240 also controls communication with nodes (for example, adjacent base stations, core network device 300) via the network communication unit 230, for example. Operations of the base station 200 described later may be operations under the control of the control unit 240 .

The control unit 240 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 controller 240 . Control unit 240 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.

Note that the operation of the functional units (specifically, at least one of the wireless communication unit 220 (receiving unit 221 and/or transmitting unit 222), the network communication unit 230, and the control unit 240) included in the base station 200 is , may be described as operations of the base station 200 .

(system operation)
(1) First Operation Example A first operation example of the mobile communication system 1 will be described with reference to FIGS. 5 and 6. FIG. In the first operation example, the UE 100 performs PUCCH transmission based on the common setting information.

In FIG. 5, the UE 100 may be in the RRC idle state or RRC inactive state between the UE 100 and the base station 200. For example, in FIG. 5, the UE 100 may be in the state in the first case. Also, in FIG. 5, the UE 100 may be performing initial access. Also, in FIG. 5, the UE 100 may be in a state before receiving the RRC setup message, RRC resume message, and/or RRC (re)establishment message. For example, in FIG. 5, UE 100 may send a HARQ-ACK for message 4 (ie PDSCH) in the random access procedure.

Step S101:
The radio communication unit 220 (transmitting unit 222 ) of the base station 200 transmits common setting information including common parameters for uplink transmission to the UE 100 . The communication unit 120 of the UE 100 receives common setting information from the base station 200 .

The wireless communication unit 220 broadcasts the common setting information. The wireless communication unit 220 may, for example, transmit a system information block (eg, SIB1) including common setting information. That is, the common configuration information may be cell-specific parameters.

For example, the common configuration information may be configuration information (specifically, UplinkConfigCommonSIB) for providing common uplink parameters for cells. Common configuration information may include bandwidth portion information for specifying a bandwidth portion for uplink transmission (uplink BWP). In this operation example, the bandwidth portion information may be information for specifying an initial bandwidth portion for uplink transmission (initial uplink BWP). Hereinafter, the initial upstream BWP will also be referred to as upstream BWP for the sake of simplicity. That is, in this embodiment, the upstream BWP may be replaced with the initial upstream BWP.

Here, the bandwidth portion information may include first bandwidth portion information (hereinafter also referred to as first information) used to set the first bandwidth portion. Also, the bandwidth portion information may include second bandwidth portion information (hereinafter referred to as second information) used to set the second bandwidth portion. Also, the bandwidth portion information may include third bandwidth portion information (hereinafter referred to as third information) used to set the third bandwidth portion.

For example, the first bandwidth portion may correspond to the first upstream BWP and the second bandwidth portion may correspond to the second upstream BWP. As an example, the first bandwidth portion and/or the second bandwidth portion may be uplink BWP used for a specific UE 100B. For example, the first bandwidth portion configured using the first information may be the initial uplink BWP used for the specific UE 100B. Also, the second bandwidth part may be an uplink BWP used by the specific UE 100B to determine PUCCH resources (that is, PRB indexes of PUCCH resources) for transmission of uplink control information. That is, the first information may be used to identify an uplink BWP (eg, initial uplink BWP) and the second information may be used to determine PUCCH resources.

For example, the first information may include information indicating frequency location and/or size (also referred to as locationAndBandwidth). This allows the first information to indicate at least one of frequency position and size. The first information may also include information indicating subcarrier spacing (also referred to as subcarrierSpacing). For example, the UE 100 may identify the first bandwidth portion based on information included in the first information. That is, the first information may include information for identifying the first bandwidth portion. Here, as described above, the first bandwidth portion may be the initial upstream BWP.

Also, the second information may include information indicating the frequency position and/or size (also referred to as locationAndBandwidth). Thereby, the second information can indicate at least one of frequency position and size. The second information may also include information indicating subcarrier spacing (also referred to as subcarrierSpacing). For example, the UE 100 may identify the second bandwidth portion based on information included in the second information. That is, the second information may include information for identifying the second bandwidth portion.

Also, the third bandwidth portion may correspond to the third upstream BWP. As an example, the third bandwidth portion may be uplink BWP used at least for general UE 100A. For example, the third bandwidth portion configured using the third information may be the initial uplink BWP used at least for the general UE 100A. That is, the third information may be used to identify the uplink BWP (eg, initial uplink BWP). Here, the third bandwidth part may be an uplink BWP used by the specific UE 100B to determine PUCCH resources (that is, PRB indexes of PUCCH resources) for transmission of uplink control information. That is, the third information may be used to determine PUCCH resources.

For example, the third information may include information indicating frequency location and/or size (also referred to as locationAndBandwidth). The third information may also include information indicating subcarrier spacing (also referred to as subcarrierSpacing). For example, the UE 100 may identify the third bandwidth portion based on information included in the third information. That is, the third information may include information for identifying the third bandwidth portion.

That is, UE 100 may determine PUCCH resources based on the second information or the third information. For example, when the second information is configured, UE 100 may determine PUCCH resources based on the second information. Also, when the third information is configured and the second information is not configured, the UE 100 may determine PUCCH resources based on the third information. As an example, when the second information is not configured, the specific UE 100B may determine PUCCH resources based on the third information configured for the general UE 100A. That is, the specific UE 100B, if the second bandwidth portion used to determine the PUCCH resource is not configured, PUCCH based on the initial uplink BWP (that is, the third bandwidth portion) used for the general UE 100A resource may be determined.

Hereinafter, in order to facilitate the description, the first information (and/or the first bandwidth portion) and the second information (and/or the second bandwidth portion) are used for description. In some aspects the second information (and/or the second bandwidth portion) may be replaced by the third information (and/or the third bandwidth portion).

That is, UE 100 may determine PUCCH resources used for frequency hopping applied to PUCCH transmission based on the second information. For example, UE 100 may determine PUCCH resources used for frequency hopping applied to PUCCH transmission, based on frequency positions and/or sizes configured based on the second information. Also, UE 100 may determine PUCCH resources used for frequency hopping applied to PUCCH transmission, based on subcarrier intervals configured based on the second information.

For example, the UE 100 may determine PUCCH resources by using any one or more of the above "math 1" to "math 7". For example, the UE 100 may use the subcarrier spacing set based on the second information as the setting μ of the subcarrier spacing in "Formula 1" and/or "Formula 2". Also, the UE 100 may use the frequency position and/or size set based on the second information as the size of the bandwidth portion i in "Formula 1" and/or "Formula 2". Also, the UE 100 may use the frequency position and/or size set based on the second information as the size of the initial uplink BWP in "Formula 5" and/or "Formula 6".

That is, in the first case, the UE 100 identifies the first bandwidth portion (eg, initial uplink BWP) based on the first information, and the frequency applied to PUCCH transmission based on the second information. A PUCCH resource used for hopping may be determined. Also, in the first case, UE 100 may perform PUCCH transmission with frequency hopping using PUCCH resources determined based on the second information.

In addition, the common configuration information is information for indicating the position of the center frequency of the (assumed) uplink BWP used to determine the PUCCH resource (that is, the PRB index of the PUCCH resource) (hereinafter, also referred to as fourth information described). For example, the UE 100 may assume (specify) an uplink BWP (for example, the frequency position of the uplink BWP) based on the fourth information, and determine PUCCH resources from the assumed uplink BWP. For example, the fourth information includes information for indicating the positions of a plurality of center frequencies (for example, the position of the first center frequency and the position of the second center frequency) with respect to the assumed uplink BWP. good too. Here, the location of the first center frequency may be used to determine the first PUCCH resource, and the location of the second center frequency may be used to determine the second PUCCH resource. That is, UE 100 may determine PUCCH resources used for frequency hopping applied to PUCCH transmission, based on the position of the center frequency configured based on the fourth information. Also, the UE 100 may perform PUCCH transmission with frequency hopping using the determined PUCCH resource.

Also, the common setting information may include information used to enable or disable frequency hopping applied to PUCCH transmission (hereinafter also referred to as fifth information). For example, the fifth information may be set for the UE 100 in the first case. For example, the control unit 140 of the UE 100 may determine whether to apply frequency hopping to PUCCH transmission based on the fifth information. That is, UE 100 may perform PUCCH transmission with frequency hopping when it is set to enable frequency hopping applied to PUCCH transmission using the fifth information. In addition, UE 100 performs PUCCH transmission without frequency hopping when frequency hopping applied to PUCCH transmission using the fifth information is not enabled (that is, disabled) is set. good too. Here, if UE 100 does not receive the fifth information, it may perform PUCCH transmission without frequency hopping. That is, the default behavior of UE 100 for frequency hopping applied to PUCCH transmission may be disabled. For example, when the initial uplink BWP is identified based on the first information (case 1), the default behavior of UE 100 for frequency hopping adapted to PUCCH transmission may be disabled. Here, for example, when the initial uplink BWP is identified based on the third information (second case described later), the default operation of UE 100 for frequency hopping adapted to PUCCH transmission is valid. There may be.

Thus, by defining the default operation of the UE 100 as enabled or disabled, there is no need to enable or disable frequency hopping applied to PUCCH transmission, and exchanged between the base station 200 and the UE 100 It is possible to reduce the amount of information.

Here, the fifth information may include information used to indicate whether frequency hopping is enabled or disabled within one slot. Here, frequency hopping within one slot is also called intra-slot frequency hopping. Also, the fifth information may include information used to indicate validity or invalidity of frequency hopping between slots. Here, frequency hopping between slots is also called inter-slot frequency hopping. For example, the control unit 140 of the UE 100 may determine whether to apply intra-slot frequency hopping to PUCCH transmission based on whether intra-slot frequency hopping is enabled or disabled. Also, the control unit 140 of the UE 100 may determine whether to apply inter-slot frequency hopping to PUCCH transmission based on whether inter-slot frequency hopping is enabled or disabled. That is, UE 100 may perform PUCCH transmission with inter-slot frequency hopping or inter-slot frequency hopping based on the fifth information.

Here, the fifth information may be set for the PUCCH format used for PUCCH transmission. That is, the fifth information may include information used to indicate validity or invalidity of frequency hopping for each PUCCH format. For example, the fifth information is information indicating the validity or invalidity of frequency hopping applied to PUCCH transmission using PUCCH format 0, and the validity or invalidity of frequency hopping applied to PUCCH transmission using PUCCH format 1. It may contain information and the like. Also, the fifth information may be used to indicate PUCCH formats for which frequency hopping is applicable. That is, UE 100 may identify PUCCH formats to which frequency hopping is applicable based on the fifth information.

Also, the common setting information may include the first PUCCH setting information. As described above, the first PUCCH configuration information may indicate cell-specific parameters (cell-specific parameters) regarding the associated BWP PUCCH. That is, the common configuration information may include first PUCCH configuration information and bandwidth portion information related to the associated BWP. Also, the first PUCCH configuration information may include PUCCH configuration common information (pucch-ConfigCommon). Here, the PUCCH configuration common information (pucch-ConfigCommon) may include PUCCH resource common information (eg, pucch-ResourceCommon) that provides a PUCCH resource set.

For example, when the UE 100 receives the first PUCCH setting information, the UE 100 may perform the following operations. That is, the UE 100 receives the first PUCCH setting information, and, when not receiving the second PUCCH setting information, the following steps S102, (A), (B), (B1), (B2), and/or , (C) may be performed. Here, the operations described in steps S102, (A-1), (B-1), (B1-1), (B1-2), and/or (C-1) below are the first operations It may be included in example operations.

Step S102:
For example, UE 100 performs uplink transmission to base station 200 . That is, communication section 120 of UE 100 transmits an uplink signal to base station 200 . The radio communication unit 220 (receiving unit 221) of the base station 200 receives the uplink signal from the UE100. Here, the control unit 140 of the UE 100 can perform the following operations. Note that the control unit 240 of the base station 200 can perform the same operation as the control unit 140 of the UE 100 in order to receive uplink signals from the UE 100 .

(A-1) Identification of initial uplink BWP1 The control unit 140 of the UE 100 may identify the initial uplink BWP for uplink transmission based on the common setting information. For example, the control unit 140 of the UE 100 may identify the initial uplink BWP1 based on the first information. For example, the control unit 140 of the UE 100 may determine the position and/or size in the frequency domain of the initial uplink BWP1 based on the information indicating the frequency position and/or size included in the first information. Here, size may be replaced with bandwidth. Also, the control unit 140 of the UE 100 may determine the subcarrier spacing used in the initial uplink BWP1 based on the information indicating the subcarrier spacing included in the first information.

Here, the control unit 140 of the UE 100 may identify the initial uplink BWP1 based on the third information. For example, the control unit 140 of the UE 100 may determine the position and/or size in the frequency domain of the initial uplink BWP1 based on information indicating the frequency position and/or size included in the third information. Also, the control unit 140 of the UE 100 may determine the subcarrier spacing used in the initial uplink BWP1 based on the information indicating the subcarrier spacing included in the third information.

That is, the UE 100 may identify the initial uplink BWP1 based on the first information or the third information. For example, when the first information is configured, the UE 100 may identify the initial uplink BWP1 based on the first information. Also, when the third information is set and the first information is not set, the UE 100 may specify the initial uplink BWP1 based on the third information. As an example, when the first information is not set, the specific UE 100B may identify the initial uplink BWP1 based on the third information set for the general UE 100A. That is, the specific UE 100B, when the first bandwidth portion used to identify the initial uplink BWP1 is not set, based on the initial uplink BWP (that is, the third bandwidth portion) used for the general UE 100A An initial upstream BWP1 may be identified.

(B-1) Determination of PUCCH resources Also, control section 140 of UE 100 may determine PUCCH resources used for PUCCH transmission based on common configuration information. Here, as described above, the PUCCH resources may include the first PUCCH resource and the second PUCCH resource. Hereinafter, the first PUCCH resource is also referred to as the first PUCCH resource R1. Also, the second PUCCH resource is also described as a second PUCCH resource R2. For example, the first PUCCH resource R1 may be a PUCCH resource mapped inside the identified initial uplink BWP1. Also, the second PUCCH resource R2 may be a resource hopped in the frequency domain from the first PUCCH resource R1 (that is, a resource used for frequency hopping applied to PUCCH transmission). For example, the second PUCCH resource R2 may be a PUCCH resource mapped outside the identified initial uplink BWP1.

Also, PUCCH resources may include a third PUCCH resource R3 hopped in the frequency domain from the second PUCCH resource R2, and may include a fourth PUCCH resource R4 hopped in the frequency domain from the third PUCCH resource R3. Here, the first PUCCH resource R1 and the third PUCCH resource R3 may be the same PUCCH resource. That is, the third PUCCH resource R3 may be determined by the same method as the first PUCCH resource R1. Also, the second PUCCH resource R2 and the fourth PUCCH resource R4 may be the same PUCCH resource. That is, the fourth PUCCH resource R4 may be determined by the same method as the second PUCCH resource R2.

Here, as an example, as shown in FIG. 6, the PUCCH region for general UE 100A may be mapped to both ends of the BWP set for general UE 100A in the frequency direction. Here, the PUCCH region for the specific UE 100B may be mapped so as to overlap with the PUCCH region for the general UE 100A. Specifically, the first PUCCH resource R1 (and third PUCCH resource R3) is mapped in one PUCCH region (hereinafter referred to as the first PUCCH region) in the frequency direction, and the second PUCCH resource R2 (and fourth PUCCH resource R4) is , may be mapped within the other PUCCH region (hereinafter referred to as the second PUCCH region) in the frequency direction.

In addition, since the bandwidth of the BWP of the specific UE 100B may be set narrower than the bandwidth of the BWP for the general UE 100A, for example, the BWP of the specific UE 100B overlaps the first PUCCH region, in the second PUCCH region may not overlap.

(B1-1) Case of specifying initial uplink BWP1 based on first information (hereinafter also referred to as first case)
In the first case, the control unit 140 of the UE 100 may identify (assume) an uplink BWP different from the initial uplink BWP1 based on the second information. Hereinafter, in order to clarify the description, the uplink BWP specified (assumed) based on the second information is also referred to as initial uplink BWP2. That is, the initial upstream BWP2 may be replaced with an upstream BWP. That is, control section 140 of UE 100 may identify (assume) initial uplink BWP2 used to determine PUCCH resources based on the second information. For example, initial uplink BWP1 may be assumed to be located in a first frequency band F1 and initial uplink BWP2 may be assumed to be located in a second frequency band F2. Here, the initial uplink BWP2 may be defined as an uplink BWP used only for performing PUCCH transmission. Also, the initial uplink BWP2 may be defined as an uplink BWP used for performing PUSCH transmission in addition to PUCCH transmission. For example, when the initial uplink BWP2 is defined as the uplink BWP used to perform PUSCH transmission, the UE 100 switches the initial uplink BWP from the initial uplink BWP1 to the initial uplink BWP2, and performs PUCCH transmission and/or PUSCH transmission. may

That is, in the first case, the control unit 140 of the UE 100 may identify the initial uplink BWP1 based on the first information, and at least determine the second PUCCH resource R2 based on the second information. . Also, in the first case, the control unit 140 of the UE 100 may determine the first PUCCH resource R1 based on the first information and determine the second PUCCH resource R2 based on the second information. For example, the control unit 140 of the UE 100 is based on the above-described "determination of PUCCH resources (that is, a method of determining PUCCH resources by using any one or more of 'math 1' to 'math 7')" , the first PUCCH resource R1 (the PUCCH resource at the first hop, ie, the PRB index of the first PUCCH resource R1). In addition, the control unit 140 of the UE 100 may determine the second PUCCH resource R2 (the PUCCH resource at the second hop, i.e., the PRB index of the second PUCCH resource R2) based on the above-described "PUCCH resource determination". . That is, for example, the control unit 140 of the UE 100 may identify the frequency position, size and/or subcarrier spacing for the initial uplink BWP2 based on the second information. That is, the control unit 140 of the UE 100, based on the specified frequency position, size, and / or subcarrier spacing, according to any one or more of "Equation 1" to "Equation 7", the first PUCCH resource R1 and / Or the second PUCCH resource R2 may be determined.

Also, the control unit 140 of the UE 100 may determine the first PUCCH resource R1 and/or the second PUCCH resource R2 based on the fourth information. For example, the control unit 140 of the UE 100 may determine the first PUCCH resource R1 based on information indicating the position of the center frequency for the initial uplink BWP1. Also, the control unit 140 of the UE 100 may determine the second PUCCH resource R2 based on information indicating the position of the center frequency for the initial uplink BWP2.

As described above, the control section 140 of the UE 100 may determine the second PUCCH resource R2 based on the information indicating the subcarrier spacing included in the second information. Here, the control section 140 of the UE 100 may determine the first PUCCH resource R1 and/or the second PUCCH resource R2 based on information indicating subcarrier intervals included in the first information. For example, if the information indicating the subcarrier spacing is not included in the second information, the control unit 140 of the UE 100, based on the information indicating the subcarrier spacing included in the first information, the first PUCCH resource R1 and / Alternatively, the second PUCCH resource R2 may be determined.

(B2-1) Case of specifying initial uplink BWP1 based on third information (hereinafter also referred to as second case)
In the second case, the control unit 140 of the UE 100 may identify (assume) the initial uplink BWP2 based on the third information. For example, the control unit 140 of the UE 100 may identify (assume) the uplink BWP (that is, the initial uplink BWP2) using a method similar to the method of identifying the initial uplink BWP1 based on the third information.

That is, in the second case, the control unit 140 of the UE 100 may assume (specify) the initial uplink BWP1 and/or the initial uplink BWP2 based on the third information, and determine the first PUCCH resource R1. Also, the control unit 140 of the UE 100 may assume (specify) the initial uplink BWP1 and/or the initial uplink BWP2 based on the third information, and determine the second PUCCH resource R2. For example, in the second case as well as in the first case, the control unit 140 of the UE 100 uses the above-described “PUCCH resource determination method (that is, any one of “Equation 1” to “Equation 7” The first PUCCH resource R1 and/or the second PUCCH resource R2 may be determined based on "method for determining PUCCH resource by using one or more methods". Also, in the second case as well as in the first case, the control unit 140 of the UE 100 determines the first PUCCH resource R1 and/or the second PUCCH resource R2 based on the fourth information. good.

Here, in the second case, control section 140 of UE 100 may assume that frequency hopping is always applied to PUCCH transmission. That is, in the second case, frequency hopping applied to PUCCH transmission may always be effective. That is, the default behavior of UE 100 for frequency hopping applied to PUCCH transmission in the second case may be valid. Here, as described above, the default behavior of UE 100 for frequency hopping applied to PUCCH transmission in the first case may be enabled.

That is, when the UE 100 receives the first information (that is, when identifying the uplink BWP (eg, the initial uplink BWP) based on the first information), the default for frequency hopping applied to PUCCH transmission may be disabled (can be disabled). Further, when the UE 100 receives the third information and does not receive the first information (that is, when identifying the uplink BWP (eg, the initial uplink BWP) based on the third information), may enable (or set to enable) the default behavior for frequency hopping applied to PUCCH transmissions.

(C-1) Guard Period Control section 140 of UE 100 may configure guard period GP when uplink transmission is performed by applying frequency hopping. Here, configuration may also be interchanged with generation. That is, for example, the control unit 140 of the UE 100 may determine the number of symbols used in the guard period GP when performing uplink transmission by applying frequency hopping. For example, when the control unit 140 of the UE 100 performs uplink transmission in the first frequency band F1 and then performs uplink transmission in the second frequency band F2 different from the first frequency band F1, the control unit 140 configures the guard period GP. A number of symbols may be determined. That is, the control unit 140 of the UE 100 may determine the number of symbols for configuring the guard period GP when changing (switching) the frequency band from the first frequency band F1 to the second frequency band F2. Here, the control unit 140 of the UE 100 may determine the number of symbols for configuring the guard period GP even when changing (switching) the frequency band from the second frequency band F2 to the first frequency band F1. . Hereinafter, determining the number of symbols for configuring the guard period GP is also simply referred to as generating (configuring) the guard period GP.

Here, in this embodiment, the first frequency band F1 and/or the second frequency band F2 may include a bandwidth portion (BWP). That is, the first frequency band F1 and/or the second frequency band F2 may include a downlink bandwidth portion (downlink BWP, initial downlink BWP). Also, the first frequency band F1 and/or the second frequency band F2 may include upstream bandwidth portions (upstream BWP, initial upstream BWP). That is, changing (switching) the frequency band may include changing (switching) the bandwidth portion (BWP). Altering (switching) the frequency band may also include retuning the frequency of the bandwidth portion (BWP). The first frequency band F1 is also described as the first frequency band. The second frequency band F2 is also described as a second frequency band.

For example, the control unit 140 of the UE 100 may generate the guard period GP when the first frequency band F1 and the second frequency band F2 are not located within one BWP that the UE 100 uses for uplink transmission. Also, the control unit 140 of the UE 100 may generate the guard period GP when there are two consecutive transmissions, uplink transmission in the first frequency band F1 and uplink transmission in the second frequency band F2. That is, the control unit 140 of the UE 100 may generate the guard period GP when changing (switching) or retuning frequencies by transmission in different frequency bands.

For example, the control unit 140 of the UE 100 may generate the guard period GP based on the subcarrier interval of the uplink BWP. That is, the control unit 140 of the UE 100 may generate the guard period GP based on information indicating subcarrier intervals included in the first information. Also, the control unit 140 of the UE 100 may generate the guard period GP based on the information indicating the subcarrier interval included in the second information. Also, the control unit 140 of the UE 100 may generate the guard period GP based on the information indicating the subcarrier interval included in the third information.

That is, the UE 100 is based on the information indicating the subcarrier spacing included in the first information, the information indicating the subcarrier spacing included in the second information, or the information indicating the subcarrier spacing included in the third information. may be used to generate the guard period GP. For example, UE 100, when the information indicating the subcarrier spacing included in the second information is set, based on the information indicating the subcarrier spacing included in the second information, generates a guard period GP. may Further, the UE 100 is configured with information indicating the subcarrier spacing included in the first information, and when the information indicating the subcarrier spacing included in the second information is not configured, the first information The guard period GP may be generated based on the information indicating the subcarrier spacing included in . Further, UE 100 is configured with information indicating the subcarrier spacing included in the third information, and when the information indicating the subcarrier spacing included in the first information is not configured, the third information The guard period GP may be generated based on the information indicating the subcarrier spacing included in . Further, the UE 100 is configured with information indicating the subcarrier spacing included in the third information, and when the information indicating the subcarrier spacing included in the second information is not configured, the third information The guard period GP may be generated based on the information indicating the subcarrier spacing included in .

As described above, the number of slots forming one subframe may vary based on the subcarrier spacing set by the base station 200. That is, the number of symbols forming one subframe may change based on the subcarrier spacing set by base station 200 . For example, based on the subcarrier interval set by the base station 200, the number of symbols forming a 1 ms subframe is determined, and the length of each symbol (length in the time direction) changes. That is, based on the subcarrier spacing set by base station 200, the length of symbols included in guard period GP (length in the time direction) may change. That is, the symbol length (length in the time direction) corresponding to the length of the guard period GP may be given based on the subcarrier spacing set by base station 200 . Here, the subcarrier interval set by the base station 200 indicates the subcarrier interval set based on the information indicating the subcarrier interval included in the first information, and the subcarrier interval included in the first information. It includes the subcarrier spacing set based on the information and/or the subcarrier spacing set based on the information indicating the subcarrier spacing included in the third information.

Here, if the subcarrier intervals are different between the two frequency bands, the control unit 140 of the UE 100 may determine the number of symbols in each of the two frequency bands. That is, for example, the control unit 140 of the UE 100 may make the number of symbols in the frequency band with wide subcarrier intervals larger than the number of symbols in the frequency band with narrow subcarrier intervals. Also, the control unit 140 of the UE 100 may set the length of the guard period GP to the total length of the number of symbols determined for each of the two frequency bands. Also, the control unit 140 of the UE 100 may set the length of the guard period GP to the number of symbols determined for each of the two frequency bands, whichever has the larger number of symbols (that is, the longer guard period GP). Also, the control unit 140 of the UE 100 may set the length of the guard period GP to the smaller number of symbols (that is, the shorter guard period GP) of the number of symbols determined for each of the two frequency bands.

Here, the number of symbols corresponding to the guard period GP may be determined according to the capabilities of the UE 100. That is, the control unit 140 of the UE 100 may hold capability information indicating the capabilities of the UE 100 (for example, UE capability information). The control unit 140 of the UE 100 may determine the number of symbols based on the capability information of the UE 100. For example, when the capability information indicates capability 1, the control unit 140 of the UE 100 may determine the length of the guard period to be 1 symbol. Also, when the capability information indicates capability 2, the control unit 140 of the UE 100 may determine the length of the guard period to be 2 symbols.

Also, for example, the communication unit 120 of the UE 100 may transmit information used to specify the number of symbols corresponding to the guard period GP to the base station 200 as capability information. That is, communication section 120 of UE 100 may transmit capability information corresponding to the number of symbols to base station 200 . Here, the capability information may be any information as long as it is information used for the number of symbols corresponding to the guard period GP.

Also, for example, the control unit 240 of the base station 200 may specify the length (that is, the number of symbols) of the guard period GP generated by the UE 100 based on the capability information of the UE 100. Also, the control unit 240 of the base station 200 may specify a period during which the UE 100 does not perform uplink transmission based on the length of the guard period GP (that is, the number of symbols).

Also, the control unit 140 of the UE 100 generates a guard period GP corresponding to the determined number of symbols. For example, the control unit 140 of the UE 100 may control not to perform uplink transmission within the guard period GP. Here, uplink transmission includes at least PUSCH transmission and/or PUCCH transmission.

As shown in FIGS. 5 and 6, communication section 120 of UE 100 transmits PUCCH using the determined PUCCH resource. That is, communication section 120 of UE 100 performs PUCCH transmission with frequency hopping using the determined PUCCH resource. Specifically, communication section 120 of UE 100 performs PUCCH transmission with frequency hopping using first PUCCH resource R1 and/or first PUCCH resource R1. For example, communication section 120 of UE 100 uses PUCCH to transmit Msg. 4 (ie, PDSCH).

Here, after executing PUCCH transmission using the first PUCCH resource R1, the control unit 140 of the UE 100 changes the frequency band from the first frequency band F1 to the second frequency band F2. This change may be retuning of the frequency band or switching of the frequency band. For example, the control unit 140 of the UE 100 may perform retuning or switching from the first frequency band F1 to the second frequency band F2 within the generated guard period GP. Here, it is assumed that the first PUCCH resource R1 is mapped to the first frequency band F1. Also assume that the second PUCCH resource R2 is mapped to the second frequency band F2.

Also, after changing the frequency band to the second frequency band, the communication unit 120 of the UE 100 performs PUCCH transmission using the second PUCCH resource R2. For example, the control unit 140 of the UE 100 may perform retuning or switching from the second frequency band F2 to the first frequency band F1 within the generated guard period GP.

Similarly, communication section 120 of UE 100 performs PUCCH transmission using third PUCCH resource R3 after changing the frequency band to the first frequency band. For example, the control unit 140 of the UE 100 may perform retuning or switching from the first frequency band F1 to the second frequency band F2 within the generated guard period GP. Also, after changing the frequency band to the second frequency band, communication section 120 of UE 100 performs PUCCH transmission using fourth PUCCH resource R4. For example, the control unit 140 of the UE 100 may perform retuning or switching from the second frequency band F2 to the first frequency band F1 within the generated guard period GP.

(2) Second Operation Example A second operation example will be described with reference to FIGS. 7 and 8, mainly focusing on differences from the above-described operation example. In the second operation example, the UE 100 performs PUCCH transmission based on dedicated setting information. In FIG. 7 , UE 100 may be in an RRC connected state between UE 100 and base station 200 . For example, in FIG. 7, the UE 100 may be in the state in the second case. Also, in FIG. 7, the UE 100 may be after executing the initial access. Also, in FIG. 7, the UE 100 may be in a state after receiving an RRC setup message, an RRC resume message, and/or an RRC (re)establishment message. For example, in FIG. 7, UE 100 may transmit HARQ-ACK for downlink user data (ie PDSCH).

Step S201:
The radio communication unit 220 of the base station 200 transmits dedicated setting information including dedicated parameters for uplink transmission to the UE 100 . The communication unit 120 of the UE 100 receives dedicated setting information from the base station 200 .

The wireless communication unit 220 transmits dedicated setting information by unicast. The wireless communication unit 220 may, for example, transmit an RRC reconfiguration message including dedicated configuration information. That is, the dedicated configuration information may be UE specific parameters.

For example, the dedicated setting information is the setting information included in the serving cell setting information (specifically, ServingCellConfig) used to configure (add or change) the UE 100 in the serving cell managed by the base station 200 (specifically, UplinkConfig). For example, the dedicated setting information may include information similar to the information included in the common setting information in the first operation example. For example, the dedicated setting information includes bandwidth portion information (first information, second information, and/or third information), information indicating the position of the center frequency for uplink BWP (fourth information), and , information (fifth information) indicating validity or invalidity of frequency hopping applied to PUCCH transmission. Here, the information included in the dedicated configuration information may be configured for active uplink BWP. For example, the UE 100 may identify (or assume) an active uplink BWP based on the first information, the second information, and/or the third information. Also, the UE 100 may determine the position of the center frequency for the active uplink BWP based on the fourth information. Also, the UE 100 may determine whether frequency hopping applied to PUCCH transmission in active uplink BWP is enabled or disabled based on the fourth information.

For example, the dedicated setting information may include the second PUCCH setting information. As described above, the second PUCCH configuration information may be the PUCCH configuration for one BWP of the normal uplink of the serving cell. That is, the second PUCCH configuration information may indicate UE-specific parameters (UE space parameters). That is, the dedicated configuration information may include second PUCCH configuration information, a BWP identifier associated with the second PUCCH configuration information, and bandwidth portion information associated with the BWP identifier.

For example, UE 100, when receiving the second PUCCH configuration information, the following step S202, (A-2), (B-2), (B2-1), (B2-2), and / or (C- 2) may be performed. Here, as described above, when the UE 100 receives the first PUCCH setting information and does not receive the second PUCCH setting information, the UE 100 may perform the operation of the first operation example.

Step S202:
For example, UE 100 performs uplink transmission to base station 200 . That is, communication section 120 of UE 100 transmits an uplink signal to base station 200 . The radio communication unit 220 of the base station 200 receives uplink signals from the UE 100 . Here, the control unit 140 of the UE 100 can perform the following operations. Note that the control unit 240 of the base station 200 can perform the same operation as the control unit 140 of the UE 100 in order to receive uplink signals from the UE 100 .

(A-2) Identification of Uplink BWP1 Control section 140 of UE 100 may identify an uplink BWP for uplink transmission (active uplink BWP) based on dedicated setting information. For example, the control unit 140 of the UE 100 may identify active uplink BWPs by any of the following methods.

For example, the control unit 140 of the UE 100 may identify the active uplink BWP1 based on the first information. For example, the control unit 140 of the UE 100 may determine the position and/or size in the frequency domain of the active uplink BWP1 based on the information indicating the frequency position and/or size included in the first information. Here, size may be replaced with bandwidth. Also, the control unit 140 of the UE 100 may determine the subcarrier spacing used in the active uplink BWP1 based on the information indicating the subcarrier spacing included in the first information.

Here, the control unit 140 of the UE 100 may identify the active uplink BWP1 based on the third information. For example, the control unit 140 of the UE 100 may determine the position and/or size in the frequency domain of the active uplink BWP1 based on information indicating the frequency position and/or size included in the third information. Also, the control unit 140 of the UE 100 may determine the subcarrier spacing used in the active uplink BWP1 based on the information indicating the subcarrier spacing included in the third information.

That is, the UE 100 may identify the active uplink BWP1 based on the first information or the third information. For example, when the first information is configured, the UE 100 may identify the active uplink BWP1 based on the first information. Also, when the third information is configured and the first information is not configured, the UE 100 may identify the active uplink BWP1 based on the third information. As an example, when the first information is not set, the specific UE 100B may identify the active uplink BWP1 based on the third information set for the general UE 100A. That is, the specific UE 100B, when the first bandwidth portion used to identify the active uplink BWP1 is not set, based on the initial uplink BWP (that is, the third bandwidth portion) used for the general UE 100A An active upstream BWP1 may be identified.

Note that, when multiple uplink BWPs are configured, control section 140 of UE 100 identifies an active BWP from multiple uplink BWPs based on an identifier indicating the first BWP used in communication with base station 200. you can

Note that in the second operation example, active upstream BWP1 and active upstream BWP2 are targeted instead of initial upstream BWP1 and initial upstream BWP2. Therefore, in the same parts as in the first operation example, the initial upstream BWP1 can be replaced with the active upstream BWP1, and the initial upstream BWP2 can be replaced with the active upstream BWP2.

(B-2) Determination of PUCCH resource Also, control section 140 of UE 100 may determine the PUCCH resource to be used for PUCCH transmission based on the dedicated setting information. Here, as in the first operation example, PUCCH resources include a first PUCCH resource R1 and a second PUCCH resource R2. Alternatively, the first PUCCH resource R1 may be a PUCCH resource mapped within the identified active uplink BWP1. Also, the second PUCCH resource R2 may be a resource hopped in the frequency domain from the first PUCCH resource R1 (that is, a resource used for frequency hopping applied to PUCCH transmission). For example, the second PUCCH resource R2 may be a PUCCH resource mapped outside the identified active uplink BWP1.

(B2-1) Case of identifying active uplink BWP1 based on first information (hereinafter also referred to as third case)
In the third case, control section 140 of UE 100 may identify (assume) active uplink BWP2 different from active uplink BWP1 based on the second information. Hereinafter, for clarity of explanation, the uplink BWP identified (assumed) based on the second information is also referred to as active uplink BWP2. That is, active upstream BWP2 may be replaced with upstream BWP. That is, control section 140 of UE 100 may identify (assume) active uplink BWP2 to be used for determining PUCCH resources based on the second information. For example, it may be assumed that active upstream BWP1 is located in a first frequency band F1 and active upstream BWP2 is located in a second frequency band F2. Here, the active uplink BWP2 may be defined as an active uplink BWP used only for performing PUCCH transmission. Also, the active uplink BWP2 may be defined as an uplink BWP that is used to perform PUSCH transmission in addition to PUCCH transmission. For example, when the active uplink BWP2 is defined as the uplink BWP used to perform PUSCH transmission, the UE 100 switches the active uplink BWP from the active uplink BWP1 to the active uplink BWP2 to perform PUCCH transmission and/or PUSCH transmission. may

That is, in the third case, the control unit 140 of the UE 100 may identify the active uplink BWP1 based on the first information and determine at least the second PUCCH resource R2 based on the second information.

Also, in the third case, the control unit 140 of the UE 100 may determine the first PUCCH resource R1 based on the first information and the second PUCCH resource R2 based on the second information. Also, the control unit 140 of the UE 100 may determine the first PUCCH resource R1 and/or the second PUCCH resource R2 based on the fourth information. For example, the control unit 140 of the UE 100 may determine the first PUCCH resource R1 based on information indicating the position of the center frequency for the active uplink BWP1. Also, the control unit 140 of the UE 100 may determine the second PUCCH resource R2 based on information indicating the position of the center frequency for the active uplink BWP1. Also, the control section 140 of the UE 100 may determine the second PUCCH resource R2 based on the information indicating the subcarrier spacing included in the second information. Here, the control unit 140 of the UE 100 may determine the first PUCCH resource R1 and/or the second PUCCH resource R2 based on information indicating subcarrier intervals included in the first information. For example, if the information indicating the subcarrier spacing is not included in the second information, the control unit 140 of the UE 100, based on the information indicating the subcarrier spacing included in the first information, the first PUCCH resource R1 and / Alternatively, the second PUCCH resource R2 may be determined.

Here, as described above, in the second case, the UE 100 uses the PUCCH resource used for frequency hopping applied to PUCCH transmission based on the start PRB information and/or the second hop PRB information (that is, PUCCH resource PRB index) may be determined. That is, in the second case, the base station 200 uses the start PRB information and/or the second hop PRB information to determine the PUCCH resource used for frequency hopping applied to PUCCH transmission (that is, the PRB of the PUCCH resource). index) may be specified. Here, as described above, the physical resource blocks (PRBs) of the subcarrier spacing setting μ are defined within the bandwidth portion and numbered from 0 to the following numbers (PRB number, PRB index). That is, the PUCCH resources specified by the starting PRB information and/or the second-hop PRB information (that is, the PRB indices of the PUCCH resources) correspond to the PRB indices numbered according to "Formula 1". That is, in order to identify the PUCCH resource (that is, the PRB index of the PUCCH resource) specified by the start PRB information and/or the second hop PRB information, the frequency position and/or size of the uplink BWP (active uplink BWP) is used. Also, the subcarrier spacing of the uplink BWP (active uplink BWP) is used to identify the PUCCH resource (that is, the PRB index of the PUCCH resource) specified by the start PRB information and/or the second hop PRB information. .

For example, in the third case, the control unit 140 of the UE 100 determines the frequency position and/or size of the uplink BWP (active uplink BWP) based on the information indicating the frequency position and/or size included in the second information. may decide. In the third case, control section 140 of UE 100 may determine subcarrier intervals for uplink BWP (active uplink BWP) based on information indicating subcarrier intervals included in the second information.

That is, the control unit 140 of the UE 100, in order to determine the PRB index of the first PUCCH resource R1 specified using the start PRB information, based on the information indicating the frequency position and / or size included in the second information A set frequency position and/or size may be used. In addition, control section 140 of UE 100 determines the PRB index of the first PUCCH resource R1 specified using the starting PRB information, based on the information indicating the subcarrier interval included in the second information. Subcarrier spacing may also be used. In addition, control section 140 of UE 100 uses the information indicating the frequency position and/or size included in the second information to determine the PRB index of the second PUCCH resource R2 specified using the second hop PRB information. A frequency position and/or size set based on this may be used. In addition, control section 140 of UE 100 configures based on information indicating subcarrier intervals included in the second information in order to determine the PRB index of second PUCCH resource R2 designated using the second hop PRB information. subcarrier spacing may be used.

Further, in the third case, the control unit 140 of the UE 100 determines the frequency position and/or size of the uplink BWP (active uplink BWP) based on the information indicating the frequency position and/or size included in the first information. may decide. For example, the control unit 140 of the UE 100 is set with information indicating the frequency position and / or size included in the first information, and is set with information indicating the frequency position and / or size included in the second information If not, the frequency position and/or size of the upstream BWP (active upstream BWP) may be determined based on the information indicating the frequency position and/or size included in the first information.

Also, in the third case, control section 140 of UE 100 may determine subcarrier intervals for uplink BWP (active uplink BWP) based on information indicating subcarrier intervals included in the first information. For example, the control unit 140 of the UE 100, when the information indicating the subcarrier interval included in the first information is set and the information indicating the subcarrier interval included in the second information is not set, The subcarrier spacing of the uplink BWP (active uplink BWP) may be determined based on the information indicating the subcarrier spacing included in the first information.

That is, the control unit 140 of the UE 100, in order to determine the PRB index of the first PUCCH resource R1 specified using the start PRB information, based on the information indicating the frequency position and / or size included in the first information A set frequency position and/or size may be used. In addition, the control unit 140 of the UE 100 is configured based on the information indicating the subcarrier interval included in the first information in order to determine the PRB index of the first PUCCH resource R1 specified using the start PRB information. Subcarrier spacing may also be used. In addition, control section 140 of UE 100 uses the information indicating the frequency position and/or size included in the first information to determine the PRB index of the second PUCCH resource R2 specified using the second hop PRB information. A frequency position and/or size set based on this may be used. In addition, control section 140 of UE 100 configures based on information indicating subcarrier intervals included in the first information in order to determine the PRB index of second PUCCH resource R2 designated using the second hop PRB information. subcarrier spacing may be used.

(B2-2) Case of identifying active uplink BWP1 based on third information (hereinafter also referred to as fourth case)
In the fourth case, the control unit 140 of the UE 100 may identify (assume) the active uplink BWP2 based on the third information. For example, the control unit 140 of the UE 100 may identify (assume) the uplink BWP (that is, the active uplink BWP2) using the same method as the method of identifying the active uplink BWP1 based on the third information.

Here, when identifying the active uplink BWP1 based on the third information, the control unit 140 of the UE 100 may determine the first PUCCH resource R1 and/or the second PUCCH resource R2 based on the third information. good.

For example, in the fourth case, the control unit 140 of the UE 100 determines the frequency position and/or size of the uplink BWP (active uplink BWP) based on the information indicating the frequency position and/or size included in the third information. may decide. Also, in the fourth case, control section 140 of UE 100 may determine subcarrier intervals for uplink BWP (active uplink BWP) based on information indicating subcarrier intervals included in the third information. That is, the control unit 140 of the UE 100, in order to determine the PRB index of the first PUCCH resource R1 specified using the start PRB information, based on the information indicating the frequency position and / or size included in the third information A set frequency position and/or size may be used. In addition, the control unit 140 of the UE 100 is configured based on the information indicating the subcarrier interval included in the third information in order to determine the PRB index of the first PUCCH resource R1 specified using the start PRB information. Subcarrier spacing may also be used. In addition, the control unit 140 of the UE 100, in order to determine the PRB index of the second PUCCH resource R2 specified using the second hop PRB information, to the information indicating the frequency position and / or size included in the third information A frequency position and/or size set based on this may be used. In addition, control section 140 of UE 100 configures based on information indicating subcarrier intervals included in the third information in order to determine the PRB index of second PUCCH resource R2 designated using the second hop PRB information. subcarrier spacing may be used.

For example, the control unit 140 of the UE 100 is set with information indicating the frequency position and / or size included in the third information, and information indicating the frequency position and / or size included in the first information is set If not, the frequency position and/or size of the uplink BWP (active uplink BWP) may be determined based on the information indicating the frequency position and/or size included in the third information. Further, the control unit 140 of the UE 100, when the information indicating the subcarrier interval included in the third information is set and the information indicating the subcarrier interval included in the first information is not set, The subcarrier spacing of the uplink BWP (active uplink BWP) may be determined based on the information indicating the subcarrier spacing included in the third information.

In addition, the control unit 140 of the UE 100 is set with information indicating the frequency position and / or size included in the third information, and is set with information indicating the frequency position and / or size included in the second information If not, the frequency position and/or size of the uplink BWP (active uplink BWP) may be determined based on the information indicating the frequency position and/or size included in the third information. Further, the control unit 140 of the UE 100, when the information indicating the subcarrier interval included in the third information is set and the information indicating the subcarrier interval included in the second information is not set, The subcarrier spacing of the uplink BWP (active uplink BWP) may be determined based on the information indicating the subcarrier spacing included in the third information.

(C-2) Guard period As in the first operation example, the control unit 140 of the UE 100 performs uplink transmission in the first frequency band F1, and then uplink transmission in the second frequency band F2 different from the first frequency band F1. , the number of symbols for configuring the guard period GP may be determined when changing (switching) the frequency band from the first frequency band F1 to the second frequency band F2. For example, when performing PUCCH transmission based on dedicated setting information, the control unit 140 of the UE 100 may generate the guard period GP based on the dedicated setting information.

For example, the control unit 140 of the UE 100 may determine the number of symbols forming the guard period GP based on the subcarrier interval of active uplink BWP. Also, the control unit 140 may determine the number of symbols according to the capability of the UE 100 . That is, communication section 120 of UE 100 may transmit information used to specify the number of symbols corresponding to guard period GP to base station 200 as capability information. Here, uplink transmission includes at least PUSCH transmission and/or PUCCH transmission.

Also, the control unit 140 of the UE 100 generates a guard period GP corresponding to the determined number of symbols. For example, the control unit 140 of the UE 100 may control not to perform uplink transmission within the guard period GP.

As shown in FIGS. 7 and 8, communication section 120 of UE 100 transmits PUCCH using the determined PUCCH resource. That is, communication section 120 of UE 100 performs PUCCH transmission with frequency hopping using the determined PUCCH resource. Specifically, communication section 120 of UE 100 performs PUCCH transmission with frequency hopping using first PUCCH resource R1 and/or second PUCCH resource R2. For example, communication section 120 of UE 100 may use PUCCH to transmit HARQ-ACK for downlink user data (that is, PDSCH).

Here, after executing PUCCH transmission using the first PUCCH resource R1, the control unit 140 of the UE 100 changes the frequency band from the first frequency band F1 to the second frequency band F2. For example, the control unit 140 of the UE 100 may perform retuning or switching from the first frequency band F1 to the second frequency band F2 within the generated guard period GP. Further, after changing the frequency band to the second frequency band, communication section 120 of UE 100 performs PUCCH transmission using second PUCCH resource R2. For example, the control unit 140 of the UE 100 may perform retuning or switching from the second frequency band F2 to the first frequency band F1 within the generated guard period GP. Similarly, the communication unit 120 of the UE 100 uses the third PUCCH resource R3 and/or the fourth PUCCH resource R4 while changing the frequency band between the first frequency band F1 and the second frequency band F2, and performs PUCCH transmission. Execute.

(Other embodiments)
In the above operation example, generation of a guard period for the case where UE 100 performs PUCCH transmission has been described as an example, but the present invention is not limited to this. For example, the operation example described above may be applied to the case where the UE 100 performs PUSCH transmission.

For example, when the control unit 140 of the UE 100 (a) retunes or switches from the first frequency band that transmits PUSCH to the second frequency band that transmits PUSCH, according to the above operation example, correspond to the guard period. may determine the number of symbols to be used. That is, control section 140 of UE 100 generates a guard period when the frequency band is changed from the first frequency band in which PUSCH transmission is performed to the second frequency band in which PUSCH transmission is performed, and the guard period The number of symbols corresponding to may be given by the subcarrier spacing set by base station 200 . Also, as described above, the control unit 140 of the UE 100 (b) retunes or switches from the first frequency band that transmits PUCCH to the second frequency band that transmits PUCCH. In accordance with the operation example described above, The number of symbols corresponding to the guard period may be determined. That is, control section 140 of UE 100 generates a guard period when the frequency band is changed from the first frequency band in which PUCCH transmission is performed to the second frequency band in which PUCCH transmission is performed, and the guard period The number of symbols corresponding to may be given by the subcarrier spacing set by base station 200 . In addition, when the control unit 140 of the UE 100 (c) retunes or switches from the first frequency band that transmits PUCCH to the second frequency band that transmits PUSCH, according to the operation example described above, corresponds to the guard period. may determine the number of symbols to be used. That is, control section 140 of UE 100 generates a guard period when the frequency band is changed from the first frequency band in which PUCCH transmission is performed to the second frequency band in which PUSCH transmission is performed, and the guard period The number of symbols corresponding to may be given by the subcarrier spacing set by base station 200 . In addition, when the control unit 140 of the UE 100 (d) retunes or switches from the first frequency band that transmits PUSCH to the second frequency band that transmits PUCCH, according to the operation example described above, corresponds to the guard period. may determine the number of symbols to be used. That is, control section 140 of UE 100 generates a guard period when the frequency band is changed from the first frequency band in which PUSCH transmission is performed to the second frequency band in which PUCCH transmission is performed, and the guard period The number of symbols corresponding to may be given by the subcarrier spacing set by base station 200 .

Here, the capability information of the UE 100 may be defined for each of one or more of (a) to (b) above. That is, the capability information of the UE 100 corresponding to each of one or more of (a) to (b) above may be defined. For example, the UE 100 may transmit capability information of the UE 100 corresponding to one or more of (a) to (b) above to the base station 200 .

In addition, control section 140 of UE 100 determines the number of symbols corresponding to the guard period based on the combination of the channel used for uplink transmission in the first frequency band and the channel used for uplink transmission in the second frequency band. good too. For example, when the channels used for uplink transmission are different between the first frequency band and the second frequency band (case (a) or (b) above), the control unit 140 of the UE 100 uses the first frequency band and the second frequency band. The number of symbols forming the guard period may be increased compared to the case where the frequency band and the channel used for uplink transmission are the same (case (c) or (d) above).

In addition, in the cases of (a) and (b) above, the control unit 140 of the UE 100 is a transmission opportunity in the first frequency band (for example, the first hop for PUCCH transmission) from the last symbol to be the card period (hereinafter, the number of first symbols) is determined based on the subcarrier spacing of the BWP in the first frequency band, and the transmission opportunity in the second frequency band (e.g., the second hop for PUCCH transmission) in the card period The number from the first symbol to do (hereinafter referred to as the second number of symbols) may be determined based on the subcarrier spacing of the BWP in the second frequency band. Control section 140 of UE 100 may set the total of the number of first symbols and the number of second symbols as the length of the guard period.

In addition, in the case of (c) above, the control unit 140 of the UE 100 determines the number from the first symbol to be the card period (second number of symbols) may be determined. Control section 140 of UE 100 may use the second number of symbols as the length of the guard period.

In addition, in the case of (d) above, the control unit 140 of the UE 100 is the number from the last symbol to be the card period in the transmission opportunity (for example, the opportunity for PUSCH transmission) in the first frequency band (the first number of symbols ) may be determined. The control unit 140 of the UE 100 may use the number of first symbols as the length of the guard period.

In the above-described embodiment, the base station 200 may include multiple units. The plurality of units may include a first unit hosting a higher layer included in the protocol stack and a second unit hosting a lower layer included in the protocol stack. The upper layers may include the RRC layer, the SDAP layer and the PDCP layer, and the lower layers may include the RLC layer, the MAC layer and the PHY layer. The first unit may be a CU (central unit), and the second unit may be a DU (Distributed Unit). The plurality of units may include a third unit that performs processing below the PHY layer. The second unit may perform processing above the PHY layer. The third unit may be an RU (Radio Unit). Base station 200 may be one of a plurality of units, and may be connected to other units of the plurality of units. Also, the base station 200 may be an IAB (Integrated Access and Backhaul) donor or an IAB node.

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 steps in the operations of the above-described embodiments do not necessarily have to be executed in chronological order according to the order described in the flow diagram or sequence diagram. 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. Furthermore, each operation flow described above is not limited to being implemented independently, but can be implemented by combining two or more operation flows. 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.

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, references to "based on" and "depending on/in response to" are used unless otherwise specified. does not mean The phrase "based on" means both "based only on" and "based at least in part on." Similarly, the phrase "depending on" means both "only depending on" and "at least partially depending on." 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. Furthermore, any references to elements using the "first," "second," etc. designations used in this disclosure do not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, references to first and second elements do not imply that only two elements may be employed therein, or that the first element must precede the second element in any way. In this disclosure, when articles are added by translation, such as a, an, and the in English, these articles are used in plural unless the context clearly indicates otherwise. shall include things.

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 communication device (100),
A communication unit (120) that performs uplink transmission in a second frequency band different from the first frequency band after performing uplink transmission in the first frequency band;
a control unit (140) that determines the number of symbols for forming a guard period for changing the frequency band from the first frequency band to the second frequency band, based on the subcarrier interval used for uplink transmission; A communication device (100).

(Appendix 2)
The communication unit (120) receives from the base station (200) information indicating subcarrier intervals of a bandwidth portion that is part of the total bandwidth of a cell of the base station (200),
The communication device (100) according to appendix 1, wherein the control unit (140) determines the number of symbols based on the information indicating the subcarrier spacing.

(Appendix 3)
The communication device (100) according to appendix 1 or 2, wherein the control unit (140) determines the number of symbols based on capability information indicating the capability of the communication device (100).

(Appendix 4)
The communication device (100) according to appendix 3, wherein the communication unit (120) transmits the capability information to the base station (200).

(Appendix 5)
The control unit (140) determines the number of symbols based on a combination of a channel used for uplink transmission in the first frequency band and a channel used for uplink transmission in the second frequency band. A communication device (100) according to any one of the preceding claims.

(Appendix 6)
A communication control method executed by a communication device (100),
After performing uplink transmission in a first frequency band, performing uplink transmission in a second frequency band different from the first frequency band;
and determining the number of symbols for forming a guard period for changing the frequency band from the first frequency band to the second frequency band based on the subcarrier interval used for the uplink transmission. Communication control Method.

Claims

A communication device (100),
A communication unit (120) that performs uplink transmission in a second frequency band different from the first frequency band after performing uplink transmission in the first frequency band;
a control unit (140) that determines the number of symbols for forming a guard period for changing the frequency band from the first frequency band to the second frequency band, based on the subcarrier interval used for uplink transmission; A communication device (100).
The communication unit (120) receives from the base station (200) information indicating subcarrier intervals of a bandwidth portion that is part of the total bandwidth of a cell of the base station (200),
The communication apparatus (100) according to claim 1, wherein the control section (140) determines the number of symbols based on information indicating the subcarrier spacing.
The communication device (100) according to claim 1 or 2, wherein the control unit (140) determines the number of symbols based on capability information indicating the capability of the communication device (100).
The communication device (100) according to claim 3, wherein the communication unit (120) transmits the capability information to the base station (200).
3. The control unit (140) determines the number of symbols based on a combination of a channel used for uplink transmission in the first frequency band and a channel used for uplink transmission in the second frequency band. A communication device (100) according to claim 1.
A communication control method executed by a communication device (100),
After performing uplink transmission in a first frequency band, performing uplink transmission in a second frequency band different from the first frequency band;
and determining the number of symbols for forming a guard period for changing the frequency band from the first frequency band to the second frequency band based on the subcarrier interval used for the uplink transmission. Communication control Method.