WO2023112960A1 - Dispositif de communication, station de base et procédé de communication - Google Patents

Dispositif de communication, station de base et procédé de communication Download PDF

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Publication number
WO2023112960A1
WO2023112960A1 PCT/JP2022/046038 JP2022046038W WO2023112960A1 WO 2023112960 A1 WO2023112960 A1 WO 2023112960A1 JP 2022046038 W JP2022046038 W JP 2022046038W WO 2023112960 A1 WO2023112960 A1 WO 2023112960A1
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Prior art keywords
switching
pdcch
base station
sssg
transmission
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PCT/JP2022/046038
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English (en)
Japanese (ja)
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正幸 星野
秀明 ▲高▼橋
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株式会社デンソー
トヨタ自動車株式会社
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Publication of WO2023112960A1 publication Critical patent/WO2023112960A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management

Definitions

  • the present disclosure relates to communication devices, base stations, and communication methods used in mobile communication systems.
  • the physical downlink control channel (PDCCH) monitoring A process of switching the monitoring state of PDCCH (hereinafter referred to as switching process) is under consideration. For example, the communication device switches the PDCCH monitoring state to a state in which the PDCCH monitoring cycle is lengthened or the PDCCH monitoring is skipped through the switching process.
  • switching process the communication device switches the PDCCH monitoring state to a state in which the PDCCH monitoring cycle is lengthened or the PDCCH monitoring is skipped through the switching process.
  • DRX discontinuous reception
  • Such an operation of skipping PDCCH monitoring and an operation of switching PDCCH monitoring states may be referred to as PDCCH monitoring adaptation.
  • Non-Patent Document 1 A method has been proposed in which a communication device performs switching processing according to voluntary uplink transmission to a base station. For example, the communication device switches the PDCCH monitoring state from a state of skipping PDCCH monitoring to a state of monitoring PDCCH, triggered by CG transmission, which is uplink transmission based on configured grants (CG) from the base station.
  • CG configured grants
  • a communication device is a communication device that performs wireless communication with a base station.
  • the communication device includes a transmitting unit that performs multiple types of uplink transmission to the base station, and a physical downlink control channel (PDCCH) according to at least one of the multiple types of uplink transmission. and a receiver for receiving a radio resource control (RRC) message including switching control information for controlling the switching process from the base station.
  • RRC radio resource control
  • the switching control information is included in an information element commonly applicable to the plurality of types of uplink transmission.
  • the control unit controls the switching process based on the switching control information.
  • a base station is a base station that performs wireless communication with a communication device.
  • the base station includes a receiving unit that receives radio signals by a plurality of types of uplink transmission from the communication device, and a physical downlink control channel (a physical downlink control channel (a transmitting unit configured to transmit a radio resource control (RRC) message including switching control information for controlling a switching process for switching a PDCCH monitoring state related to PDCCH monitoring to the communication device.
  • RRC radio resource control
  • the switching control information is included in an information element commonly applicable to the plurality of types of uplink transmission.
  • a communication method is a communication method executed by a communication device that performs wireless communication with a base station.
  • the communication method comprises a step of performing multiple types of uplink transmission to the base station, and a physical downlink control channel (PDCCH) according to at least one of the multiple types of uplink transmission.
  • RRC radio resource control
  • the switching control information is included in an information element commonly applicable to the plurality of types of uplink transmission.
  • the switching process is controlled based on the switching control information.
  • 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 showing an overview of radio communication operations in the mobile communication system according to the embodiment.
  • FIG. 4 is a diagram showing an overview of PDCCH skipping according to the embodiment.
  • FIG. 5 is a diagram showing an overview of search space set (SSSG) switching according to the embodiment.
  • FIG. 6 is a diagram illustrating DRX and power saving states according to an embodiment.
  • FIG. 7 is a diagram illustrating an example of SSSG switching according to the embodiment.
  • 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 showing an overview of radio communication operations in the mobile communication system according to the embodiment.
  • FIG. 4 is a diagram showing an overview of
  • FIG. 8 is a diagram illustrating an example of timer-based SSSG switching according to an embodiment.
  • FIG. 9 is a diagram showing an overview of CG transmission according to the embodiment.
  • FIG. 10 is a diagram illustrating an overview of SR transmission according to the embodiment.
  • FIG. 11 is a diagram illustrating an overview of RACH transmission according to the embodiment.
  • FIG. 12 is a diagram illustrating the configuration of a UE according to the embodiment;
  • FIG. 13 is a diagram showing the configuration of a base station according to the embodiment.
  • FIG. 14 is a diagram illustrating an operation sequence example 1 regarding CG-induced switching processing according to the embodiment.
  • FIG. 15 is a diagram illustrating an operation sequence example 2 regarding CG-induced switching processing according to the embodiment.
  • FIG. 16 is a diagram illustrating specific example 1 of CG-induced switching processing according to the embodiment.
  • FIG. 17 is a diagram illustrating specific example 2 of the CG-induced switching process according to the embodiment.
  • FIG. 18 is a diagram illustrating an operation sequence example 1 related to SR-caused switching processing according to the embodiment.
  • FIG. 19 is a diagram illustrating an operation sequence example 2 regarding the SR-caused switching process according to the embodiment.
  • FIG. 20 is a diagram illustrating specific example 1 of the SR-caused switching process according to the embodiment.
  • FIG. 21 is a diagram illustrating specific example 2 of the SR-caused switching process according to the embodiment.
  • FIG. 22 is a diagram illustrating an operation sequence example 1 related to RACH-triggered switching processing according to the embodiment.
  • FIG. 23 is a diagram illustrating an operation sequence example 2 related to RACH-triggered switching processing according to the embodiment.
  • FIG. 24 is a diagram illustrating an operation sequence example 3 related to RACH-triggered switching processing according to the embodiment.
  • FIG. 25 is a diagram illustrating a specific example 1 of the RACH-triggered switching process according to the embodiment.
  • FIG. 26 is a diagram illustrating a specific example 2 of the RACH-triggered switching process according to the embodiment.
  • the communication device switches the PDCCH monitoring state according to uplink transmission
  • the communication device autonomously switches the PDCCH monitoring state when the communication device autonomously switches the PDCCH monitoring state, the actual PDCCH monitoring state in the communication device and the PDCCH monitoring state recognized by the base station are changed. can be inconsistent with Therefore, there is a concern that the base station cannot properly perform radio communication with the communication device after the communication device switches the PDCCH monitoring state according to uplink transmission.
  • one object of the present disclosure is to provide a communication device, a base station, and a communication method that enable appropriate wireless communication even when the PDCCH monitoring state is switched according to uplink transmission. one.
  • the mobile communication system 1 is, for example, a system conforming to the 3GPP Technical Specification (TS).
  • TS Technical Specification
  • a mobile communication system based on the 3GPP standard 5th Generation System (5GS), that is, NR (New Radio) will be described as an example.
  • the mobile communication system 1 has a network 10 and user equipment (UE) 100 communicating with the network 10 .
  • the network 10 includes an NG-RAN (Next Generation Radio Access Network) 20, which is a 5G radio access network, and a 5GC (5G Core Network) 30, which is a 5G core network.
  • NG-RAN Next Generation Radio Access Network
  • 5G Core Network 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 may be a user equipment defined by 3GPP technical specifications.
  • 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, etc.) or a device provided thereon (eg, an Aerial UE).
  • the UE 100 may be a sensor or a device attached thereto.
  • the UE 100 includes a mobile station, a mobile terminal, a mobile device, a mobile unit, a subscriber station, a subscriber terminal, a subscriber device, a subscriber unit, a wireless station, a wireless terminal, a wireless device, a wireless unit, a remote station, and a remote terminal. , remote device, or remote unit.
  • 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) and is composed of one component carrier.
  • the term “cell” may represent a radio communication resource and may also represent a communication target of UE 100 .
  • Each base station 200 can perform radio communication with the UE 100 residing in its own cell.
  • the base station 200 communicates with the UE 100 using the RAN protocol stack.
  • Base station 200 provides NR user plane and control plane protocol termination towards UE 100 and is connected to 5GC 30 via NG interface.
  • Such an NR base station 200 is sometimes referred to as a gNodeB (gNB).
  • gNodeB gNodeB
  • 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 Access and Mobility Management Function
  • UPF User Plane Function
  • AMF performs mobility management of UE100.
  • UPF provides functions specialized for user plane processing.
  • the AMF and UPF are connected with the base station 200 via the NG interface.
  • 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, RRC layer.
  • PHY physical
  • MAC Medium Access Control
  • RLC Radio Link Control
  • PDCP Packet Data Convergence Protocol
  • 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 (Hybrid Automatic Repeat Request: HARQ), 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 UE 100 .
  • MCS modulation and coding scheme
  • 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 IP flows, which are the units in which the core network performs QoS control, and radio bearers, which are the units in which the AS (Access Stratum) performs QoS (Quality of Service) 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 .
  • UE 100 When there is an RRC connection between the RRC of UE 100 and the RRC of base station 200, UE 100 is in the RRC connected state. If there is no RRC connection between the RRC of the UE 100 and the RRC of the base station 200, the UE 100 is in RRC idle state. When the RRC connection between the RRC of UE 100 and the RRC of base station 200 is suspended, UE 100 is in RRC inactive state.
  • the NAS layer located above the RRC layer performs session management and mobility management for UE100.
  • NAS signaling is transmitted between the NAS layer of the UE 100 and the NAS layer of the core network device 300 (AMF).
  • AMF core network device 300
  • the UE 100 has an application layer and the like in addition to the radio interface protocol.
  • the base station 200 configures the UE 100 with a search space corresponding to the candidate timing at which the PDCCH is provided.
  • UE 100 in the RRC connected state monitors PDCCH in the set search space, receives downlink control information (Downlink Control Information: DCI) carried by PDCCH, and assigns resources (scheduling) indicated by DCI.
  • DCI Downlink Control Information
  • PDSCH physical downlink shared channel
  • PUSCH physical uplink shared channel
  • the UE 100 may monitor a set of PDCCH candidates according to the corresponding search space.
  • the UE 100 is a control resource set (CORESET) in the downlink bandwidth part (DL BWP) in the serving cell in which PDCCH monitoring is set, and is a PDCCH candidate. set may be monitored.
  • monitoring may refer to decoding each of the PDCCH candidates according to the monitored DCI format.
  • the base station 200 transmits an RRC message including PDCCH settings (PDCCH settings) to the UE 100, and performs various PDCCH settings for the UE 100.
  • This RRC message is a UE-specific RRC message, and may be, for example, an RRC Reconfiguration message.
  • the search space settings include a search space period (also referred to as a PDCCH monitoring period), a search space offset (also referred to as a PDCCH monitoring offset), a search space duration (for example, the number of consecutive slots), and PDCCH monitoring. symbols for, aggregation level, search space type, DCI format, etc.
  • each search space (each set of search spaces) may be associated with one CORESET.
  • the search space setting may be set for each of one or more DL BWPs.
  • the search space type may include a UE-specific search space (USS) and/or a UE common search space (CSS).
  • DCI formats include scheduling DCI formats used for PDSCH or PUSCH scheduling and non-scheduling DCI formats not used for such scheduling.
  • DCI transmitted in a scheduling DCI format is called scheduling DCI
  • DCI transmitted in a non-scheduling DCI format is called non-scheduling DCI.
  • Scheduling DCI formats include a downlink DCI format used for PDSCH scheduling (eg, DCI format 1_0, DCI format 1_1, DCI format 1_2) and an uplink DCI format used for PUSCH scheduling (eg, DCI format 0_0, DCI format 0_1 and DCI format 0_2).
  • the scheduling DCI may be UE-specific DCI that is sent for each UE.
  • the scheduling DCI may be transmitted by applying an RNTI (Radio Network Temporary Identifier) assigned to each UE.
  • RNTI Radio Network Temporary Identifier
  • non-scheduling DCI formats include, for example, DCI format 2_0 and DCI format 2_6.
  • the non-scheduling DCI may be a DCI that can be transmitted to multiple UEs 100 at once.
  • non-scheduling DCI may be transmitted by applying a common RNTI to multiple UEs 100 .
  • step S2 the UE 100 starts monitoring PDCCH in the search space set by the base station 200.
  • DCI format 1_0, DCI format 0_0, DCI format 1_1, DCI format 0_1, DCI format 1_2, and DCI format 0_2 are configured in the UE 100, and the UE 100 monitors the PDCCH (DCI) based on the configuration.
  • base station 200 may configure UE 100 to monitor DCI format 1_0 and DCI format 0_0 in a certain search space.
  • base station 200 may configure UE 100 to monitor DCI format 1_1 and DCI format 0_1 in a certain search space.
  • base station 200 may configure UE 100 to monitor DCI format 1_2 and DCI format 0_2 in a certain search space. That is, for example, base station 200 may configure UE 100 to monitor PDCCH candidates for DCI format 1_0 and DCI format 0_0 when CSS is configured for a certain search space. Also, base station 200 may configure UE 100 to monitor PDCCH candidates for DCI format 2_0 when CSS is configured for a certain search space. In addition, base station 200 instructs UE 100 to monitor PDCCH candidates for DCI format 1_0 and DCI format 0_0 or DCI format 1_1 and DCI format 0_1 when USS is configured for a certain search space.
  • base station 200 instructs UE 100 to monitor PDCCH candidates for DCI format 1_0 and DCI format 0_0 or DCI format 1_2 and DCI format 0_2 when USS is configured for a certain search space. can be set to
  • the UE 100 receives and detects DCI or PDCCH addressed to itself from the base station 200.
  • the UE 100 uses the C-RNTI (Cell-Radio Network Temporary Identifier (RNTI)) and MCS-C-RNTI (Modulation and Coding Scheme-C-RNTI) assigned to the UE 100 from the base station 200, or the CS-RNTI ( Blind decoding of PDCCH is performed using Configured Scheduling-RNTI), and successfully decoded DCI is acquired as DCI addressed to its own UE.
  • the DCI transmitted from the base station 200 is added with CRC (Cyclic Redundancy Check) parity bits scrambled by C-RNTI and MCS-C-RNTI or CS-RNTI.
  • CRC Cyclic Redundancy Check
  • step S4 the UE 100 receives downlink data from the base station 200 on the scheduled PDSCH. If the DCI indicates PUSCH scheduling, the UE 100 transmits uplink data to the base station 200 on the scheduled PUSCH in step S5.
  • downlink data is also referred to as downlink shared channel (DL-SCH) data.
  • Uplink data is also referred to as uplink-shared channel (UL-SCH) data.
  • the downlink shared channel and the uplink shared channel are transport channels
  • PDSCH and PUSCH are physical channels. For example, downlink data (DL-SCH data) is mapped to PDSCH, and uplink data (UL-SCH data) is mapped to PUSCH.
  • the UE 100 monitors the PDCCH provided at predetermined intervals in the search space based on the search space setting set by the base station 200 .
  • a PDCCH monitoring state regarding PDCCH monitoring in UE 100 may be referred to as a PDCCH monitoring execution state for monitoring PDCCH.
  • the base station 200 transmits to the UE 100 a skip instruction DCI that instructs PDCCH skipping.
  • Skip instruction DCI is an example of switching instruction DCI.
  • a skip indication DCI may be a scheduling DCI or a non-scheduling DCI.
  • the UE 100 skips PDCCH monitoring for a predetermined period in response to receiving the skip instruction DCI from the base station 200 .
  • the predetermined period for skipping PDCCH monitoring may be set by higher layer signaling (RRC message).
  • the predetermined period may be determined by a timer value (that is, a setting value of a switching timer), or may be determined by the number of consecutive slots or the number of consecutive search spaces.
  • the predetermined period may be referred to as a skip period.
  • PDCCH skipping reduces the power consumption required for the UE 100 to monitor the PDCCH, and can achieve dynamic power saving.
  • PDCCH skipping may mean skipping PDCCH monitoring, and PDCCH skipping may be referred to as PDCCH monitoring skipping. In this embodiment, such a PDCCH monitoring state in the UE 100 may be referred to as a PDCCH skipping state.
  • the base station 200 configures multiple search space sets, which are sets of settings related to search spaces, in the UE 100 through higher layer signaling (RRC messages).
  • a set of settings related to such a search space is called a Search Space Set (SSS) or a Search Space Set Group (SSSG), but in the following it will be mainly called SSSG.
  • One SSSG includes one or more search space settings and is identified by an SSSG index.
  • base station 200 has SSSG#0 (first search space set) in which search spaces are provided at a predetermined cycle, and SSSG#1 (second search space set) in which search spaces are provided at a cycle longer than the predetermined cycle. space set) shall be set in the UE 100.
  • the base station 200 sets two SSSGs, SSSG#0 and SSSG#1, to the UE 100.
  • Three or more SSSGs are set for each of one or more BWPs (for example, DL BWP). You may set to UE100.
  • setting a plurality of SSSGs (or three or more SSSGs) in the UE 100 may mean setting a plurality of SSSGs (or three or more SSSGs) for one BWP, or a plurality of may mean setting multiple SSSGs (or three or more SSSGs) for each BWP.
  • search spaces include UE-specific search spaces and/or UE-common search spaces as described above
  • a set of settings related to UE-specific search spaces may be referred to as a UE-specific search space set.
  • the set of configurations for UE-common search spaces may be referred to as a UE-common search space set.
  • the UE 100 monitors the PDCCH provided at predetermined intervals in the search space based on SSSG#0.
  • the base station 200 transmits to the UE 100 a switching instruction DCI that instructs SSSG switching.
  • the switching instruction DCI may be a scheduling DCI or a non-scheduling DCI. That is, the base station 200 uses DCI to instruct the UE 100 to switch from SSSG#0 to SSSG#1.
  • the UE 100 starts switching to SSSG#1 in response to receiving the switching instruction DCI.
  • UE 100 performs switching to SSSG#1 in a symbol after a switching delay time (Switch delay) from the last symbol of PDCCH in SSSG#0.
  • Switch delay may be set from the base station 200 to the UE 100 by higher layer signaling (RRC message).
  • UE 100 monitors PDCCHs provided in a cycle longer than a predetermined cycle in search spaces.
  • Such search space set switching reduces the power consumption required for UE 100 to monitor the PDCCH, and can achieve dynamic power saving.
  • switching from SSSG#1 to SSSG#0 may be instructed by the base station 200 using DCI in the same manner as switching from SSSG#0 to SSSG#1, or the UE 100 may switch from SSSG#1 using a timer. You may switch to SSSG#0.
  • the timer value of such a switching timer (Switching timer) is set from the base station 200 to the UE 100 by higher layer signaling (RRC message).
  • the UE 100 starts monitoring the PDCCH in SSSG#1 in response to detection of the switching instruction DCI to SSSG#1, sets the value of the switching timer to the value set by the upper layer, and activates the switching timer.
  • UE 100 decrements the value of the switching timer, stops monitoring PDCCH in SSSG#1 when the switching timer expires, and starts monitoring PDCCH in SSSG#0 after a switch delay time.
  • indexes also called search space group IDs
  • base station 200 may configure a set (group) of search spaces for UE 100 by configuring an index associated with the one or more search space sets.
  • the name SSSG is merely an example, and any name may be used as long as it is a set (group) of search spaces to which one or more search space sets are associated.
  • one SSSG set in the UE 100 is set to have no search space, and switching to the one SSSG is indicated by DCI, thereby realizing the same operation as the PDCCH skipping described above.
  • a search space is set in one SSSG set in the UE 100, and no monitoring opportunity for the search space is set (or a parameter related to the monitoring opportunity is set to a predetermined value (e.g., "0" or "Null”). ), an operation similar to the PDCCH skipping described above may be realized.
  • UE 100 is configured with a total of three SSSGs: an SSSG with a normal search space period, an SSSG with no search space period, and an SSSG with a long search space period. Flexible power saving can be realized by setting such various SSSGs in the UE 100 and instructing switching of SSSGs by DCI.
  • the UE 100 discontinuously monitors the PDCCH using the DRX operation.
  • the DRX operation is controlled by the following DRX parameters.
  • - DRX cycle Defines the cycle in which the UE 100 wakes up.
  • On duration On-duration: This is the period during which the UE 100 waits to receive the PDCCH after waking up. If the UE 100 successfully decodes the PDCCH, the UE 100 remains awake and starts an inactivity-timer.
  • Inactivity timer Defines the time period during which the UE 100 waits after the last successful PDCCH decoding and sleeps again when the PDCCH decoding fails.
  • the ON duration may be started.
  • FIG. 6 corresponds to the operation with the set value of DRX-SlotOffset set to zero.
  • Retransmission timer defines the time interval during which retransmissions are expected.
  • the UE 100 configured with DRX does not need to monitor the PDCCH in the sleep state (that is, the reception off period), so the power consumption of the UE 100 can be reduced.
  • the UE 100 waits to receive the PDCCH and monitors the PDCCH in the search space during the active time.
  • the active time is any of the on duration timer (drx-onDurationTimer), the inactivity timer (drx-InactivityTimer), the downlink retransmission timer (drx-RetransmissionTimerDL), and the uplink retransmission timer (drx-RetransmissionTimerUL) is in operation. It's time.
  • PDCCH supervisory adaptation is a generic term for PDCCH skipping and SSSG switching. That is, in this embodiment, PDCCH monitoring adaptation may be replaced by PDCCH skipping and/or SSSG switching. In PDCCH monitoring adaptation, a process of switching the PDCCH monitoring state for PDCCH monitoring may be performed.
  • a plurality of SSSGs having different search space cycles (different PDCCH cycles) will be described, but it is possible to set the same search space cycle (different PDCCH cycles) for a plurality of SSSGs. is of course.
  • the base station 200 transmits one or more RRC messages to the UE100.
  • the one or more RRC messages may include a dedicated RRC message (eg, RRCReconfiguration message) sent for each UE.
  • UE 100 receives the RRC message.
  • the RRC message includes PDCCH monitoring adaptation settings (hereinafter referred to as PMA settings).
  • the PMA settings may be settings for performing PDCCH monitoring adaptation.
  • PMA setting includes information for setting SSSG, information for setting a switching timer for switching SSSG, information for setting a duration related to PDCCH monitoring, and setting cases related to PDCCH monitoring state switching. may include at least one of information for
  • the information for setting the case may be information for setting the case (also referred to as operation) of PDCCH monitoring adaptation. As described below, it may be specified to perform PDCCH skipping (ie PDCCH skipping only), for example for the case of PDCCH monitoring adaptation. It may also be specified to perform SSSG switching (ie SSSG switching only) as a case of PDCCH monitoring adaptation. It may also be specified to perform PDCCH skipping and SSSG switching as a case of PDCCH monitoring adaptation. That is, cases may be defined corresponding to operations performed as PDCCH monitoring adaptation.
  • Information for setting SSSG includes, for example, information for setting SSSG to which PDCCH skipping is applied, and information for setting SSSG to which SSSG switching is applied. At least one may be included.
  • the SSSG setting information may also include information for setting at least one of a default SSSG (eg, SSSG#0) and a non-default SSSG that is not the default SSSG. That is, SSSG configuration information may be configured for default SSSG and/or non-default SSSG.
  • the SSSG configuration information may include SSSG information configured for each downlink BWP, and may include SSSG information configured for each downlink serving cell. That is, the SSSG configuration information may be configured for the downlink BWP and/or the downlink serving cell.
  • the SSSG configuration information may further include a search space configuration associated with each SSSG index (which may be referred to as a group index) corresponding to each SSSG.
  • a search space setting includes one or more search space settings.
  • Each search space configuration includes at least one of search space period, search space offset, search space duration (e.g., number of consecutive slots), symbols for PDCCH monitoring, aggregation level, search space type, and DCI format. OK.
  • the switch timer information may include switch timer information for the default SSSG and may include switch timer information for the non-default SSSG. That is, switching timer information may be configured for default SSSG and/or non-default SSSG. Note that the switching timer may not be set for the default SSSG.
  • the switching timer information may include switching timer information configured for each downlink BWP, and may include switching timer information configured for each downlink serving cell. That is, the switching timer information may be configured for the downlink BWP and/or the downlink serving cell.
  • the switching timer information may include a timer set value of the switching timer.
  • Information for setting a period related to PDCCH monitoring may include information on a period set for each SSSG.
  • the monitoring period information may include period information for the default SSSG and may include period information for the non-default SSSG. That is, monitoring period information may be set for default SSSGs and/or non-default SSSGs.
  • the monitoring period information may include information on a period set for each downlink BWP, or may include information on a period set for each downlink serving cell. That is, the monitoring period information may be configured for the downlink BWP and/or the downlink serving cell.
  • the set period may be a skip period for skipping PDCCH monitoring.
  • a case related to PDCCH monitoring state switching specifically, information for setting a case of PDCCH monitoring adaptation (hereinafter referred to as case setting information as appropriate) includes case information set for each downlink BWP. Alternatively, it may include case information configured for each downlink serving cell. That is, the case configuration information may be configured for the downlink BWP and/or the downlink serving cell.
  • case setting information includes case information set for each downlink BWP.
  • the case configuration information may be configured for the downlink BWP and/or the downlink serving cell.
  • Table 1 shows an example of DCI notification contents in each case.
  • PDCCH skipping that is, execution of PDCCH skipping only
  • the configuration for case #2 configures two different durations of SSSG switching (ie performing SSSG switching only) as PDCCH monitoring adaptation.
  • the configuration for case #3 configures SSSG switching for three different durations (ie performing SSSG switching only) as a PDCCH monitoring adaptation.
  • two different periods of SSSG switching and PDCCH skipping are configured as PDCCH monitoring adaptations.
  • M (set to 1 or 2) indicates the number of periods set based on the monitoring period information. That is, M corresponds to period X. Period X may be referred to as a skip period.
  • the PDCCH monitoring adaptation applied by UE 100 (that is, SSSG switching and/or PDCCH skipping) information field in the switching instruction DCI (hereinafter, PDCCH monitoring adaptation notification field:) is set to It is associated with the operation (behavior) of the UE 100 shown.
  • Operations of the UE 100 may be defined as follows. • PDCCH skipping is not activated in Beh1. • For Beh1A, PDCCH skipping means stopping PDCCH monitoring for period X. • Beh2 stops monitoring the search space sets associated with SSSG#1 and SSSG#2 (if configured) and monitors the search space set associated with SSSG#0.
  • Beh2A stops monitoring the search space sets associated with SSSG#0 and SSSG#2 (if configured) and monitors the search space set associated with SSSG#1.
  • Beh2B stop monitoring the search space set associated with SSSG#0 and SSSG#1 (if configured) and monitor the search space set associated with SSSG#2.
  • the information indicating the correspondence relationship in Table 1 may be stored in advance in each of the UE 100 and the base station 200, or may be notified from the base station 200 to the UE 100 by an RRC message.
  • the UE 100 When case #1 is configured in the UE 100, the UE 100 has one for PDCCH monitoring for each of one or more downlink BWPs (or each of one or more SSSGs) in a serving cell. Alternatively, multiple periods (including skip periods) may be set.
  • the UE 100 When case #2 or case #3 is configured in the UE 100, the UE 100 has one serving cell for each of one or more downlink BWPs (or each of one or more SSSGs).
  • One or more group indices may be configured.
  • the UE 100 When case #4 is configured in the UE 100, the UE 100 has PDCCH for each of one or more downlink BWPs (or each of one or more SSSGs) in a certain serving cell, in a certain serving cell. One or more periods (including skip periods) for monitoring may be set. Also, in the UE 100, one or more group indexes (SSSG indexes) are set for each of one or more downlink BWPs (or each of one or more SSSGs) in a serving cell. you can Note that the PDCCH monitoring adaptation notification field in DCI for PDCCH monitoring is defined as 2 bits.
  • the RRC message may include field settings indicating the presence or absence of the PDCCH monitoring adaptation notification field for each of one or more DCI formats.
  • the switching indication DCI is a DCI having a DCI format indicating that there is a PDCCH monitoring adaptation notification field by field setting.
  • the presence/absence of the PDCCH monitoring adaptation notification field may be configured commonly or independently for non-scheduling DCI and/or scheduling DCI.
  • the presence/absence of the PDCCH monitoring adaptation notification field (presence/absence) may be set commonly for DCI format 1_1 and DCI format 0_1, and commonly for DCI format 1_2 and DCI format 0_2.
  • the presence or absence (presence/absence) of the PDCCH monitoring adaptation notification field may be set commonly for DCI format 1_1 and DCI format 1_2, and commonly for DCI format 0_1 and DCI format 0_2.
  • the field setting indicating presence/absence of the PDCCH monitoring adaptation notification field may be replaced with the PMA setting. That is, the presence of the PDCCH monitoring adaptation notification field in one or more DCI formats may be indicated by configuring the PMA settings for the UE 100 . For example, UE 100 may identify that one or more DCI formats have a PDCCH monitoring adaptation notification field based on the PMA configuration being configured.
  • the RRC message may include a bit number setting that indicates the number of bits in the PDCCH supervisory adaptation notification field for each of one or more DCI formats.
  • the number of bits of the PDCCH monitoring adaptation notification field may be directly configured commonly or independently.
  • the number of bits of the PDCCH monitoring adaptation notification field may be configured commonly for DCI format 1_1 and DCI format 0_1 and/or commonly for DCI format 1_2 and DCI format 0_2.
  • a PDCCH supervisory adaptation notification field of up to 2 bits is configured for DCI format 1_1 and/or DCI format 0_1, and/or a PDCCH supervisory adaptation notification field of 1 bit is configured for DCI format 1_2 and DCI format 0_2.
  • the number of bits of the PDCCH monitoring adaptation notification field may be configured commonly for DCI format 1_1 and DCI format 1_2, and commonly for DCI format 0_1 and DCI format 0_2.
  • the number of bits setting indicating the number of bits of the PDCCH supervisory adaptation notification field may be replaced with the PMA setting.
  • the number of bits of the PDCCH monitoring adaptation notification field included in one or more DCI formats may be determined by configuring the PMA settings for the UE 100 .
  • UE 100 may determine the number of bits of the PDCCH monitoring adaptation notification field included in one or more DCI formats according to the number of SSSGs configured based on information for configuring SSSGs.
  • UE 100 may determine the number of bits of the PDCCH monitoring adaptation notification field included in one or more DCI formats according to the number of periods set based on the monitoring period information.
  • UE 100 may determine the number of bits of the PDCCH monitoring adaptation notification field included in one or more DCI formats, depending on the case set based on the case setting information (for example, shown in Table 1. may determine the number of bits to be stored).
  • step S12 the UE 100 stores the information set by the base station 200.
  • the base station 200 transmits a switching instruction DCI having a PDCCH monitoring adaptation notification field to the UE 100 on the PDCCH.
  • UE 100 receives the switching instruction DCI on the PDCCH.
  • the UE 100 may determine whether or not the DCI format of the detected DCI corresponds to the switching instruction DCI, based on field settings set by the base station 200 .
  • step S14 the UE 100 acquires the value set in the PDCCH monitoring adaptation notification field of the switching instruction DCI received in step S13.
  • UE 100 may specify the number of bits in the PDCCH monitoring adaptation notification field based on the bit number setting set by base station 200 and then acquire the value set in the PDCCH monitoring adaptation notification field.
  • the UE 100 is based on the number of SSSG indexes set in the UE 100 (i.e., the number of entries in the set SSSG index (list)), and the number of bits of the PDCCH monitoring adaptation notification field is specified.
  • the value set in the PDCCH supervisory adaptation notification field may be obtained.
  • UE 100 calculates and identifies the number of bits of the PDCCH monitoring adaptation notification field by an integer value rounded up after the decimal point of log2 (I). good too.
  • step S15 the UE 100 changes the PDCCH monitoring state to the state corresponding to the value set in the PDCCH monitoring adaptation notification field (hereinafter referred to as the PDCCH monitoring adaptation notification field value) in the received switching instruction DCI based on the set case. switch.
  • the PDCCH monitoring adaptation notification field value the PDCCH monitoring adaptation notification field value
  • An operation example of the UE 100 according to the number of bits of the PDCCH monitoring adaptation notification field in each case is shown below.
  • Case #1 PDCCH Supervisory Adaptation Notification field in DCI for PDCCH Monitoring is 1 bit If the PDCCH Supervisory Adaptation Notification field value is '0', no PDCCH skipping is performed. If the PDCCH monitoring adaptation notification field value is '1', PDCCH skipping is performed during the configured period (the period of the first value).
  • PDCCH supervisory adaptation notification field in DCI for PDCCH supervision is 2 bits If the PDCCH supervisory adaptation notification field value is '00', no PDCCH skipping is performed. If the PDCCH monitoring adaptation notification field value is '01', PDCCH skipping is performed during the configured period (the period of the first value). If the PDCCH monitoring adaptation notification field value is '10', PDCCH skipping is performed during the configured period (second value period). If the PDCCH monitoring adaptation notification field value is '11', PDCCH skipping is performed during the configured period (the period of the third value).
  • Case #2 If the PDCCH supervisory adaptation notification field in the DCI for PDCCH supervision is 1 bit If the PDCCH supervisory adaptation notification field value is '0', the PDCCH according to the search space set corresponding to group index #0 Start monitoring and stop monitoring the PDCCH according to the search space set corresponding to the other group index value. If the PDCCH monitoring adaptation notification field value is '1', start monitoring PDCCH according to the search space set corresponding to group index #1, and start monitoring PDCCH according to the search space set corresponding to other group index values. Stop monitoring.
  • Case #3 If the PDCCH supervisory adaptation notification field in the DCI for PDCCH supervision is 2 bits If the PDCCH supervisory adaptation notification field value is '00', the PDCCH according to the search space set corresponding to group index #0 Start monitoring and stop monitoring the PDCCH according to the search space set corresponding to the other group index value. If the PDCCH monitoring adaptation notification field value is '01', start monitoring PDCCH according to the search space set corresponding to group index #1, and start monitoring PDCCH according to the search space set corresponding to other group index values. Stop monitoring.
  • PDCCH monitoring adaptation notification field value is '10'
  • start monitoring the PDCCH according to the search space set corresponding to group index #2 and start monitoring the PDCCH according to the search space set corresponding to the other group index value. Stop monitoring.
  • the definition of when the PDCCH Supervisory Adaptation Notification field value is '11' is reserved.
  • Case #4 If the number of periods for PDCCH monitoring is set to '1' If the PDCCH Monitoring Adaptation Notification field value is '00', PDCCH monitoring according to the search space set corresponding to group index #0. and stop monitoring the PDCCH according to the search space set corresponding to the other group index value. If the PDCCH monitoring adaptation notification field value is '01', start monitoring PDCCH according to the search space set corresponding to group index #1, and start monitoring PDCCH according to the search space set corresponding to other group index values. Stop monitoring. If the PDCCH monitoring adaptation notification field value is '10', PDCCH skipping is performed during the configured period (the period of the first value). The definition of when the PDCCH Supervisory Adaptation Notification field value is '11' is reserved.
  • Case #4 If the number of periods for PDCCH monitoring is set to '2' If the PDCCH Monitoring Adaptation Notification field value is '00', PDCCH monitoring according to the search space set corresponding to group index #0. and stop monitoring the PDCCH according to the search space set corresponding to the other group index value. If the PDCCH monitoring adaptation notification field value is '01', start monitoring PDCCH according to the search space set corresponding to group index #1, and start monitoring PDCCH according to the search space set corresponding to other group index values. Stop monitoring. If the PDCCH monitoring adaptation notification field value is '10', PDCCH skipping is performed during the configured period (the period of the first value). If the PDCCH monitoring adaptation notification field value is '11', PDCCH skipping is performed during the configured period (second value period).
  • timer-based SSSG switching according to this embodiment will be described with reference to FIG.
  • the UE 100 switches between SSSGs on a timer basis and three or more SSSGs can be configured in the UE 100 .
  • the base station 200 may set one of the SSSGs set in the UE 100 as a default SSSG in the UE 100.
  • the base station 200 may specify one of the SSSG indices set in the UE 100 as "defaultSSSG-Id".
  • the base station 200 may set the 'defaultSSSG-Id' using an RRC message. That is, the base station 200 may configure the default SSSG for the UE 100 using information included in the RRC message.
  • the default SSSG may be an SSSG determined according to a predetermined rule shared in advance by the base station 200 and the UE 100 among SSSGs set in the UE 100 .
  • the default SSSG may be the SSSG set in the UE 100 by the base station 200 as the default SSSG.
  • step S21 the UE 100 for which multiple SSSGs have been set by the base station 200 monitors the PDCCH using one of the multiple SSSGs.
  • step S22 the UE 100 receives a switching instruction DCI that instructs switching to another SSSG from the base station 200 on the PDCCH.
  • step S23 the UE 100 switches to the SSSG specified by the switching instruction DCI and activates the timer (switching timer) associated with the SSSG.
  • step S24 the UE 100 determines whether the switching timer has expired.
  • step S25 the UE 100 switches to the default SSSG among the multiple set SSSGs.
  • the base station 200 can grasp the SSSG to which the UE 100 is switched. Since the switching timer is a value set by the base station 200, the base station 200 manages the switching timer in the same manner as the UE 100, and can recognize that the switching timer has expired in the UE 100.
  • the UE 100 determines the default SSSG according to a predetermined rule. do. For example, if the RRC message does not contain information for setting the default SSSG, the UE 100 may determine the default SSSG according to a predetermined rule.
  • the predetermined rule is, for example, a rule defined by 3GPP technical specifications, and a rule shared in advance by the base station 200 and the UE 100 .
  • the predetermined rule is the SSSG corresponding to the SSSG index with the smallest value among the SSSG indexes set in the UE 100, or the SSSG corresponding to the SSSG index with the largest value. good. For example, if the rule is to set the SSSG corresponding to the SSSG index with the smallest value as the default SSSG, the UE 100 determines the SSSG with SSSG index #0 as the default SSSG. If the rule is to set the SSSG corresponding to the SSSG index with the largest value as the default SSSG, the UE 100 determines the SSSG of SSSG index #4 as the default SSSG.
  • the UE 100 may receive from the base station 200 correspondence information indicating the correspondence between the SSSG index set in the UE 100 and the value set in the SSSG information field in the switching instruction DCI.
  • the predetermined rule may be a rule for determining, as the default SSSG, the SSSG corresponding to the SSSG index indicated by a specific value (eg, "0") set in the SSSG information field in the switching instruction DCI.
  • the UE 100 determines, as the default SSSG, an SSSG having an SSSG index in which the value set in the SSSG information field in the switching instruction DCI is "0".
  • the predetermined rule may be a rule that determines the SSSG corresponding to the SSSG index (for example, index #0) having a predetermined value among the SSSG indices set in the UE 100 as the default SSSG.
  • the predetermined rule may be a rule for determining, among the SSSGs set in the UE 100, SSSGs other than SSSGs skipping PDCCH monitoring as default SSSGs. That is, UE 100 may assume that the SSSG index corresponding to PDCCH skipping is not set as the default SSSG.
  • the UE 100 may apply a specific SSSG when switching from a DRX reception off period to a reception on period (active time).
  • the predetermined rule may be a rule that determines that particular SSSG as the default SSSG. That is, the UE 100 may determine the first SSSG to monitor the PDCCH after the DRX reception off period has elapsed as the default SSSG.
  • the base station 200 may transmit an RRC message including information for setting the specific SSSG, and the UE 100 may determine the specific SSSG as the default SSSG.
  • the base station 200 transmits an RRC message including information for setting the default SSSG, and the UE 100 uses the default SSSG as the first SSSG to monitor the PDCCH after the DRX reception off period has passed. good too.
  • the UE 100 may receive a scheduling DCI indicating radio resources allocated to the UE 100 as a switching instruction DCI. After receiving the scheduling DCI as the switching instruction DCI, the UE 100 may start the switching timer at the timing of switching to one SSSG (specifically, the slot for performing SSSG switching).
  • the UE 100 may use a common value as the switching timer value applied to two or more of the three or more SSSGs set in the UE 100 .
  • the base station 200 may set a common value as the switching timer value applied to two or more SSSGs among the three or more SSSGs set in the UE 100 .
  • the UE 100 may use an individual value for each SSSG as the switching timer value applied to each SSSG set in the UE 100 .
  • the base station 200 may set an individual switching timer setting value in the UE 100 for each SSSG.
  • the UE 100 may activate the switching timer associated with the SSSG at the timing (slot) at which switching to the SSSG is started.
  • the timing (slot) at which switching to the SSSG is started.
  • resources used for PDCCH monitoring are not dedicated, and switching to the relevant SSSG can be started at any timing. Taking advantage of this advantage, it is possible to minimize the effect of the switching delay time without disturbing the PDCCH monitoring operation. Note that the UE 100 may monitor the PDDCH assuming the default SSSG after the switching timer expires.
  • CG transmission is uplink transmission based on configured grants (CG) from the base station 200 .
  • a CG transmission may be referred to as a CG-PUSCH transmission.
  • CG transmission may include transmission of MAC PDU (MAC Protocol Data Unit) on PUSCH.
  • CG transmission includes type 1 CG transmission and type 2 CG transmission.
  • uplink transmission is permitted by RRC signaling (RRC message).
  • RRC message For Type 1 CG transmission, the actual uplink grant may be set via RRC.
  • the UE 100 performs CG transmission using the set radio resource (hereinafter referred to as CG resource).
  • uplink transmission is permitted by RRC signaling (RRC message) and DCI.
  • RRC message RRC message
  • the actual uplink grants may be provided via PDCCH (destined for CS-RNTI).
  • UE 100 performs CG transmission using the set CG resource when CG transmission is activated (effective) by DCI after type 1 CG transmission is set by the RRC message. The UE 100 does not perform CG transmission when CG transmission is deactivated (disabled). Note that CG transmission can be deactivated by DCI.
  • step S31 the base station 200 transmits to the UE 100 an RRC message including CG settings for setting parameters used for CG transmission.
  • UE 100 receives an RRC message including CG settings from base station 200 .
  • UE 100 stores the information set by the RRC message.
  • CG configuration may be an information element used to configure uplink transmission without dynamic grant.
  • a CG configuration may include, for example, information identifying a CG resource.
  • step S32 when the base station 200 sets type 2 CG transmission to the UE 100 as CG transmission, it may transmit DCI for activating CG transmission.
  • UE 100 may receive DCI from base station 200 .
  • type 2 CG transmission is set as CG transmission, UE 100 activates type 2 CG transmission in response to reception of DCI for activating CG transmission.
  • the UE 100 detects a CG transmission trigger.
  • a CG transmission trigger may be the occurrence of a transmission opportunity due to CG resources.
  • the CG transmission trigger is generated when uplink data and/or a buffer status report (BSR) to be transmitted to the base station 200 is generated, and when the uplink data to be transmitted to the base station 200 is MAC of the UE 100 It may be either having arrived at the layer or instructing CG transmission from the MAC layer to the physical (PHY) layer in the UE 100 .
  • BSR buffer status report
  • CG transmission may be MAC PDU transmission. That is, for example, when there is no uplink data in the transmission buffer and CG transmission (transmission of MAC PDUs to the base station 200) is not executed (triggered), the PDCCH monitoring state need not be switched. That is, in this embodiment, uplink data may correspond to MAC PDUs. Uplink data (that is, MAC PDU) may correspond to user data.
  • step S34 the UE 100 performs CG transmission to the base station 200 on PUSCH in response to the CG transmission trigger, based on the CG settings set in step S31.
  • the base station 200 may transmit acknowledgment information (ACK or NACK) to the UE 100 according to the reception status of uplink data by CG transmission. Also, the base station 200 may instruct retransmission of CG transmission. For example, base station 200 may indicate retransmission of CG transmission using a DCI format (eg, DCI format 0_1 or 0_2) with CRC parity bits scrambled by CS-RNTI. For example, retransmission of CG transmission is indicated using a New Data Indicator (NDI) included in the DCI format (for example, by setting the value of the New Data Indicator (NDI) to 1). good too.
  • NDI New Data Indicator
  • the acknowledgment information may include a DCI format (which may be PDCCH). That is, the acknowledgment information may include the DCI format (PDCCH) used to indicate retransmission.
  • the DCI format (PDCCH) used to instruct retransmission is a retransmission grant (uplink Also called link HARQ retransmission grant).
  • the acknowledgment information may be ACK or NACK.
  • the UE 100 receives the acknowledgment information. Based on the acknowledgment information, the UE 100 performs CG transmission retransmission processing (eg, hybrid automatic repeat request (HARQ) processing for uplink data (or simply uplink)). For example, the UE 100 may perform retransmission of CG transmission based on reception of the DCI format used to instruct retransmission of CG transmission (that is, based on detection of the PDCCH in which the DCI format is transmitted). . That is, after executing CG transmission, UE 100 may attempt to receive a DCI format used to instruct retransmission of CG transmission. That is, UE 100 may monitor the PDCCH used to instruct retransmission of CG transmission after executing CG transmission.
  • CG transmission retransmission processing eg, hybrid automatic repeat request (HARQ) processing for uplink data (or simply uplink)
  • HARQ hybrid automatic repeat request
  • the UE 100 may perform retransmission of CG transmission based on reception of the DCI format used to instruct retrans
  • the UE 100 transmits an SR on PUCCH to request uplink radio resources, specifically uplink shared channel (UL-SCH) resources, for new transmissions.
  • SR may be used to request uplink shared channel (UL-SCH) resources for initial transmission.
  • uplink shared channel (UL-SCH) resources may be used to transmit uplink data (ie, data on UL-SCH).
  • the base station 200 transmits to the UE 100 an RRC message including an SR setting that sets parameters for SR resources.
  • the SR configuration includes multiple SR resource configurations each associated with a logical channel.
  • Each SR resource setting includes, for the corresponding logical channel, information for setting the PUCCH resource used for SR transmission, information for setting the period and / or offset used for SR transmission, and SR priority (Phy-Priority ).
  • the SR priority may indicate the priority in the physical layer of the corresponding SR resource.
  • SR priority indicates whether the corresponding SR resource is high-priority or low-priority in priority processing in the physical layer. good.
  • UE 100 stores the information set by the RRC message.
  • SR transmission triggers are the generation of uplink data and/or a buffer status report (BSR) to be transmitted to the base station 200, and the arrival of the uplink data to be transmitted to the base station 200 at the MAC layer of the UE 100. , or instructing SR transmission from the MAC layer to the physical (PHY) layer in the UE 100 . That is, the SR transmission trigger may be the triggering of the SR.
  • BSR buffer status report
  • step S43 the UE 100 transmits SR to the base station 200 on the PUCCH in response to the SR transmission trigger based on the SR setting set in step S31. Specifically, the UE 100 transmits SR using the SR resource configuration corresponding to the logical channel targeted for SR transmission, that is, the logical channel for transmitting uplink data.
  • step S44 the base station 200 allocates UL-SCH resources to the UE100 in response to receiving the SR from the UE100. Specifically, base station 200 transmits a scheduling DCI including a UL grant for allocating UL-SCH resources to UE 100 on PDCCH.
  • the scheduling DCI including the UL grant for allocating UL-SCH resources may correspond to the DCI format used for PUSCH scheduling.
  • the UE 100 transmits a RACH transmission, specifically a RACH preamble (also called random access preamble) on a physical random access channel (PRACH), for example for beam failure recovery (BFR).
  • RACH transmission may mean starting a RACH procedure (also called random access procedure).
  • the UE 100 may perform RACH transmission in response to the absence of SR PUCCH resources for the logical channel corresponding to the generated uplink data. Note that RACH transmission may be referred to as PRACH transmission.
  • the base station 200 transmits to the UE 100 an RRC message including BFR settings for setting RACH resources (specifically, PRACH resources) for BFR.
  • the BFR configuration includes information for configuring RACH resources (eg, dedicated RACH preambles) and information on reference signal resources used for beam failure detection. That is, RACH resources include PRACH resources and/or RACH preambles.
  • base station 200 may transmit to UE 100 an RRC message including a RACH configuration for configuring RACH resources not for BFR.
  • UE 100 stores the information set by the RRC message.
  • the UE 100 detects a RACH transmission trigger.
  • the RACH transmission trigger may be either that the UE 100 has detected a beam failure or that there is no PUCCH resource for SR for the logical channel corresponding to the generated uplink data. That is, the RACH transmission trigger may be that the RACH is triggered.
  • step S53 the UE 100 transmits the RACH preamble to the base station 200 on the RACH (PRACH) in response to the RACH transmission trigger, based on the BFR setting or RACH setting set in step S41. Specifically, the UE 100 transmits to the base station 200 a dedicated RACH preamble set by BFR setting or RACH setting.
  • PRACH RACH
  • step S54 the base station 200 allocates UL-SCH resources to the UE100 in response to receiving the RACH from the UE100. Specifically, base station 200 transmits a scheduling DCI including a UL grant for allocating UL-SCH resources to UE 100 on PDCCH.
  • the UE 100 performs uplink transmission (eg, CG transmission, SR transmission, and RACH transmission) to the base station 200 in accordance with a predetermined transmission trigger.
  • uplink transmissions can occur in power saving states (ie, lengthening the PDCCH monitoring period or skipping PDCCH monitoring) by performing PDCCH monitoring adaptation.
  • power saving states ie, lengthening the PDCCH monitoring period or skipping PDCCH monitoring
  • wireless communication is performed between the UE 100 and the base station 200. Therefore, the PDCCH monitoring state is switched from the power saving state with the transmission trigger of the uplink transmission as a trigger to exit the power saving state. is preferred.
  • the UE 100 switches the PDCCH monitoring state according to uplink transmission
  • the UE 100 autonomously switches the PDCCH monitoring state when the UE 100 autonomously switches the PDCCH monitoring state, the actual PDCCH monitoring state in the UE 100 and the PDCCH monitoring state recognized by the base station 200 are different. can be inconsistent with Therefore, there is a concern that the base station 200 cannot properly perform radio communication with the UE 100 after the UE 100 switches the PDCCH monitoring state. Therefore, in this embodiment, it is possible to switch the PDCCH monitoring state based on uplink transmission under the control of the base station 200 .
  • the "PDCCH monitoring state" in this embodiment may include skipping PDCCH monitoring and/or performing PDCCH monitoring in the configured SSSG.
  • switching the PDCCH monitoring state may include switching the operation from skipping PDCCH monitoring to monitoring PDCCH with the configured SSSG.
  • switching the PDCCH monitoring state may include switching the operation from the operation of monitoring the PDCCH in the configured SSSG to the operation of skipping the monitoring of the PDCCH.
  • switching the PDCCH monitoring state includes switching the operation from the operation of monitoring the PDCCH in the set first SSSG to the operation of monitoring the PDCCH in the set second SSSG. good too.
  • switching the PDCCH monitoring state may include switching the SSSG used for PDCCH monitoring.
  • switching the PDCCH monitoring state may include switching the SSSG from the SSSG configured for PDCCH skipping to the SSSG configured for PDCCH monitoring.
  • switching the PDCCH monitoring state may include switching the SSSG from the SSSG configured for PDCCH monitoring to the SSSG configured for PDCCH skipping.
  • switching the PDCCH monitoring state may include switching the SSSG from the first SSSG set for PDCCH monitoring to the second SSSG set for PDCCH monitoring.
  • switching the PDCCH monitoring state may correspond to execution of PDCCH monitoring adaptation.
  • the SSSG used for PDCCH monitoring is also referred to as a PDCCH monitoring state for ease of explanation.
  • the set SSSG includes a default SSSG.
  • UE 100 includes communication unit 110 and control unit 120 .
  • the communication unit 110 performs wireless communication with the base station 200 by transmitting and receiving wireless signals to and from the base station 200 .
  • the communication unit 110 has at least one transmitter 111 and at least one receiver 112 .
  • the transmitting section 111 and the receiving section 112 may be configured including an antenna and an RF circuit.
  • the antenna converts a signal into radio waves and radiates the radio waves into space. Also, the antenna receives radio waves in space and converts the radio waves into signals.
  • the RF circuitry performs analog processing of signals transmitted and received through the antenna.
  • the RF circuitry may include high frequency filters, amplifiers, modulators, low pass filters, and the like.
  • the control unit 120 performs various controls in the UE 100.
  • Control unit 120 controls communication with base station 200 via communication unit 110 .
  • the operations of the UE 100 described above and below may be operations under the control of the control unit 120 .
  • the control unit 120 may include at least one processor capable of executing a program and a memory that stores the program.
  • the processor may execute a program to operate the control unit 120 .
  • the control unit 120 may include a digital signal processor that performs digital processing of signals transmitted and received through the antenna and RF circuitry.
  • the digital processing includes processing of the protocol stack of the RAN. Note that the memory stores programs executed by the processor, parameters related to the programs, and data related to the programs.
  • the memory is ROM (Read Only Memory), EPROM (Erasable Programmable Read Only Memory), EEPROM (Electrically Erasable Programmable Read Only Memory), RAM (Random Access Mem ory) and flash memory. All or part of the memory may be included within the processor.
  • the UE 100 performs wireless communication with the base station 200.
  • transmission section 111 performs multiple types of uplink transmission to base station 200 .
  • the control unit 120 performs switching processing for switching a PDCCH monitoring state regarding monitoring of a physical downlink control channel (PDCCH) according to at least one uplink transmission among a plurality of types of uplink transmission.
  • the receiving unit 112 receives from the base station 200 a radio resource control (RRC) message including switching control information for controlling switching processing.
  • RRC radio resource control
  • the switching control information is included in an information element commonly applicable to multiple types of uplink transmission.
  • the control unit 120 controls switching processing based on switching control information. As a result, switching of the PDCCH monitoring state based on uplink transmission can be performed under the control of the base station 200, and appropriate wireless communication can be performed even when the PDCCH monitoring state is switched.
  • the switching control information may include common parameters that are commonly applied to switching processes corresponding to multiple types of uplink transmission. This eliminates the need to individually include parameters commonly applicable to each switching process to set each switching process. As a result, it is possible to reduce the amount of information to be included in the RRC message for setting the switching process.
  • the switching control information may include individual parameters that are individually applied to switching processes corresponding to multiple types of uplink transmission.
  • the individual parameter may indicate whether to enable execution of the switching process in at least one of a plurality of types of uplink transmission. This allows the base station 200 to flexibly control execution of switching processing according to multiple types of uplink transmission.
  • the information element may be a PDCCH setting for setting user equipment-specific PDCCH parameters.
  • the switching control information when changing the switching control information included in the PDCCH setting and another parameter, the switching control information ( change) can be notified to the UE 100.
  • the control unit 120 can also control switching of the PDCCH monitoring state based on CG transmission when changing settings based on the PDCCH settings.
  • multiple types of uplink transmission include at least one of uplink transmission based on configured grants (CG: Congiured Grants) from the base station 200, a scheduling request to the base station 200, and physical random access channel (PRACH) transmission.
  • CG Congiured Grants
  • PRACH physical random access channel
  • Switching of the PDCCH monitoring state based on such uplink transmission can be performed under the control of the base station 200, and even when the PDCCH monitoring state is switched, radio communication can be appropriately performed.
  • Base station 200 has communication unit 210 , network interface 220 , and control unit 230 .
  • the communication unit 210 receives radio signals from the UE 100 and transmits radio signals to the UE 100.
  • the communication unit 210 has at least one transmitter 211 and at least one receiver 212 .
  • the transmitting section 211 and the receiving section 212 may be configured including an antenna and an RF circuit.
  • the antenna converts a signal into radio waves and radiates the radio waves into space.
  • 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 network interface 220 transmits and receives signals to and from the network.
  • the network interface 220 receives signals from adjacent base stations connected via an Xn interface, which is an interface between base stations, and transmits signals to adjacent base stations. Also, the network interface 220 receives signals from the core network device 300 connected via the NG interface, for example, and transmits signals to the core network device 300 .
  • the control unit 230 performs various controls in the base station 200.
  • the control unit 230 controls communication with the UE 100 via the communication unit 210, for example.
  • the control unit 230 controls communication with nodes (for example, adjacent base stations, core network device 300) via the network interface 220, for example.
  • the operations of the base station 200 described above and below may be operations under the control of the control unit 230 .
  • the control unit 230 may include at least one processor capable of executing programs and a memory storing the programs.
  • the processor may execute a program to operate the controller 230 .
  • Control unit 230 may include a digital signal processor that performs digital processing of signals transmitted and received through the antenna and RF circuitry.
  • the digital processing includes processing of the protocol stack of the RAN.
  • the memory stores programs executed by the processor, parameters related to the programs, and data related to the programs. All or part of the memory may be included within the processor.
  • the base station 200 performs wireless communication with the UE 100.
  • the receiving unit 212 receives radio signals from the UE 100 by uplink transmission of multiple types.
  • the transmitting unit 211 transmits switching control information for controlling a switching process for switching a PDCCH monitoring state related to monitoring of a physical downlink control channel (PDCCH) according to at least one uplink transmission among a plurality of types of uplink transmission.
  • a radio resource control (RRC) message containing the radio resource control (RRC) message is sent to the UE 100 .
  • the switching control information is included in an information element commonly applicable to multiple types of uplink transmission.
  • the switching control information may include common parameters that are commonly applied to switching processes corresponding to multiple types of uplink transmission. This eliminates the need to individually include parameters commonly applicable to each switching process to set each switching process. As a result, it is possible to reduce the amount of information to be included in the RRC message for setting the switching process.
  • the switching control information may include individual parameters that are applied individually (that is, independently) to switching processes corresponding to multiple types of uplink transmission.
  • the individual parameter may indicate whether to enable execution of the switching process in at least one of a plurality of types of uplink transmission. This allows the base station 200 to flexibly control execution of switching processing according to multiple types of uplink transmission.
  • the information element may be a PDCCH setting for setting user equipment-specific PDCCH parameters.
  • the switching control information when changing the switching control information included in the PDCCH setting and another parameter, the switching control together with the change of the parameter Information (change of) can be notified to the UE 100 .
  • the control unit 120 can also control switching of the PDCCH monitoring state based on CG transmission when changing settings based on the PDCCH settings.
  • multiple types of uplink transmission include at least one of uplink transmission based on configured grants (CG: Congiured Grants) from the base station 200, a scheduling request to the base station 200, and physical random access channel (PRACH) transmission.
  • CG Congiured Grants
  • PRACH physical random access channel
  • Switching of the PDCCH monitoring state based on such uplink transmission can be performed under the control of the base station 200, and even when the PDCCH monitoring state is switched, radio communication can be appropriately performed.
  • the UE 100 performs switching processing for switching the PDCCH monitoring state according to CG transmission among multiple types of uplink transmission.
  • step S101 the base station 200 (transmitting section 211) transmits an RRC message to the UE100.
  • the RRC message may be a dedicated RRC message (eg, RRCReconfiguration message) sent for each UE.
  • UE 100 (receiving unit 112) receives the RRC message.
  • the RRC message includes switching control information for controlling switching processing for switching the PDCCH monitoring state according to at least one of the multiple types of uplink transmission.
  • the switching control information is included in an information element commonly applicable to multiple types of uplink transmission. As described above, the switching control information may be included as the information element, for example, in the PDCCH configuration (PDCCH-Config) for configuring user equipment-specific PDCCH parameters.
  • PDCCH-Config PDCCH configuration
  • the switching control information may include common parameters (for example, common settings) commonly applied to switching processes corresponding to multiple types of uplink transmission. Therefore, the common parameters are, for example, CG-induced switching processing, SR-induced switching processing for switching the PDCCH monitoring state according to the scheduling request (SR), and RACH (Random Access Channel) transmission (or PRACH (Physical RACH) transmission). may be commonly applied to control the RACH-triggered switching process to switch the PDCCH monitoring state by This allows the UE 100 (control unit 120) to execute various switching processes based on the common parameter, triggered by at least one of the multiple types of uplink transmission. That is, in the present embodiment, multiple types of uplink transmission may include scheduling request (SR) transmission. Also, multiple types of uplink transmission may include RACH transmission (or PRACH transmission). Also, multiple types of uplink transmission may include CG transmission.
  • SR scheduling request
  • RACH Random Access Channel
  • PRACH Physical RACH
  • the switching control information may include individual parameters (for example, individual settings) individually applied to each of the switching processes corresponding to multiple types of uplink transmission. Therefore, the individual parameters are, for example, parameters applied only to control the CG-induced switching process, parameters applied only to control the SR-induced switching process, and parameters applied only to control the RACH-induced switching process. may include at least any of the parameters
  • Individual parameters may indicate settings that are not set by common parameters. Alternatively, individual parameters may indicate settings that are prioritized over common parameters.
  • the individual parameter enables (or sets) execution of the switching process (or switching based on the multiple types of uplink transmission) in at least one of the multiple types of uplink transmission. You may indicate no.
  • the individual parameter may include information (eg, 1-bit flag information) indicating whether to enable or disable execution of the CG-induced switching process (or CG-induced switching). .
  • the individual parameter may include information (for example, 1-bit flag information) indicating whether to enable or disable execution of the SR-induced switching process (or SR-induced switching).
  • the individual parameter is information (for example, a 1-bit flag information).
  • the UE 100 can execute various effective switching processes triggered by at least one of the plurality of types of uplink transmission based on the individual parameter.
  • the common parameter may include 1-bit flag information indicating whether to enable or disable each switching process.
  • the RRC message may include a CG setting (Configured GrantConfig) for setting parameters used for CG transmission.
  • the CG settings may contain individual parameters that apply only to control the CG-triggered switching process.
  • the PDCCH configuration may include common parameters and individual parameters.
  • the CG configuration may contain individual parameters that are not included in the PDCCH configuration.
  • the PDCCH configuration may include only common parameters and the CG configuration may include dedicated parameters.
  • the UE 100 determines that execution of switching processing based on uplink transmission (or switching based on uplink transmission) is enabled (or is set) (or identification).
  • the UE 100 may determine that execution of the CG-induced switching process (or CG-induced switching) is enabled (or set).
  • the switching control information may, for example, configure PDCCH monitoring adaptation (or execution of the PDCCH monitoring adaptation) based on uplink transmission.
  • the switching control information may also configure PDCCH supervisory adaptation (or execution of such PDCCH supervisory adaptation) when type 2 CG transmission is enabled (activated).
  • the switching control information may include PDCCH monitoring adaptation settings (PMA settings). Therefore, the switching control information may include at least one of SSSG configuration information, switching timer information, monitoring period information, and case configuration information.
  • the UE 100 (control unit 120) may determine that execution of the CG-induced switching process is enabled (set) when the RRC message includes the PMA setting.
  • the switching control information may include at least one of the information included in the PMA settings. Accordingly, the switching control information may be at least part of the information included in the PMA configuration, for example.
  • the switching control information may be information regarding whether to enable (or set) the execution of the CG-based switching process.
  • the UE 100 (control unit 120) may perform the CG-induced switching process based on the switching control information indicating that the CG-induced switching process is enabled.
  • the UE 100 may control not to perform the CG-induced switching process when the RRC message does not include switching control information. For example, the UE 100 (control unit 120) is not set to enable execution of the CG-induced switching process, and/or the PDCCH monitoring state (for example, SSSG) of the switching destination when performing the CG-induced switching process is If it is not set, CG-induced switching processing is not performed even if CG transmission is performed. This can prevent the actual PDCCH monitoring state in UE 100 and the PDCCH monitoring state recognized by base station 200 from being inconsistent.
  • the PDCCH monitoring state for example, SSSG
  • the RRC message may include information indicating the setting for switching the PDCCH monitoring state in step S104 (that is, the setting for switching the PDCCH monitoring state at a trigger different from the uplink transmission (or the trigger for the uplink transmission)).
  • the base station 200 may transmit DCI for activating CG transmission when type 2 CG transmission is set to the UE 100 as CG transmission.
  • the UE 100 (receiving unit 112) may receive the DCI.
  • the UE 100 (control unit 230) may enable CG transmission in response to reception of DCI.
  • the UE 100 After receiving the setting for CG transmission, the UE 100 (receiving unit 112) may receive DCI used to activate or deactivate CG transmission. When CG transmission is activated based on DCI, the UE 100 (control unit 120) may perform CG-induced switching processing based on switching control information. Thereby, the UE 100 can maintain the power saving state when CG transmission is not actually performed.
  • step S103 the base station 200 (transmitting section 211) transmits a switching instruction DCI that instructs PDCCH skipping or SSSG switching to the UE 100 on the PDCCH.
  • UE 100 receives the switching instruction DCI.
  • step S104 the UE 100 (control unit 120) switches the PDCCH monitoring state in response to receiving the switching instruction DCI. For example, when PDCCH skipping is set, UE 100 (control unit 120) monitors the PDCCH for a predetermined period (set predetermined period) according to the value set in the switching instruction DCI (skip instruction DCI). You can skip across When SSSG switching is set, the UE 100 (control unit 120) may switch to the SSSG indicated by the switching instruction DCI according to the value set in the switching instruction DCI. As a result, UE 100 enters a power saving state in which power consumption required for PDCCH monitoring is reduced.
  • the UE 100 (control unit 120) detects a CG transmission trigger.
  • step S106 the UE 100 (transmitting unit 111) transmits uplink data to the base station 200 on PUSCH in response to the CG transmission trigger based on the CG settings set in step S101.
  • the base station 200 (receiving unit 212) receives uplink data by CG transmission.
  • step S107 the UE 100 (control unit 120) switches the PDCCH monitoring state according to CG transmission (CG-induced switching processing).
  • the UE 100 controls CG switching processing based on the switching control information.
  • CG-induced switching processing is processing for switching the PDCCH monitoring state from the first monitoring state to the second monitoring state.
  • the first monitoring state corresponds to the power saving state described above.
  • the second monitoring state is a state in which the PDCCH is monitored more frequently than in the first monitoring state. This makes it easier to deal with wireless communication (data communication) that occurs after CG transmission. That is, the UE 100 (control unit 120) may perform the above-described PDCCH skipping and/or SSSG switching based on CG transmission (or CG transmission trigger). Also, the CG-induced switching process may correspond to PDCCH skipping and/or SSSG switching based on CG transmission (or CG transmission triggers).
  • the first monitoring state may be a state in which PDCCH is monitored in a first period
  • the second monitoring state may be a state in which PDCCH is monitored in a second period shorter than the first period. That is, in the second monitoring state, the search space period interval may be shorter than in the first monitoring state.
  • UE 100 control unit 120
  • SSSG switching is set, after the DCI instructs switching to SSSG having a long PDCCH monitoring cycle, in response to CG transmission, to SSSG having a short PDCCH monitoring cycle switch.
  • the first monitoring state may be a PDCCH skipping state in which PDCCH is not monitored (that is, PDCCH skipping)
  • the second monitoring state may be a state in which PDCCH is periodically monitored. Therefore, the CG switching process may be a process of switching the PDCCH monitoring state from the PDCCH skipping state to the PDCCH monitoring state (that is, the PDCCH monitoring execution state).
  • the UE 100 control unit 120
  • the UE 100 is set to PDCCH skipping, and after being instructed by the DCI to perform PDCCH skipping, switches to the state of monitoring the PDCCH according to CG transmission.
  • the UE 100 (control unit 120) may stop or cancel execution of PDCCH skipping as a process of switching to the PDCCH monitoring execution state.
  • the UE 100 may perform CG-induced switching processing only when performing CG transmission when the UE 100 itself is in the power saving state. That is, the UE 100 (control unit 120) may perform the CG-induced switching process only when CG transmission is performed during the period of PDCCH skipping (predetermined period of time). That is, the UE 100 (control unit 120) does not need to perform CG-induced switching processing when performing CG transmission when the UE 100 itself is not in the power saving state. Alternatively, the UE 100 (control unit 120) may perform CG-induced switching processing only when CG transmission is performed in a state in which PDCCH skipping and/or SSSG switching are set.
  • UE 100 (control unit 120) does not need to perform CG-induced switching processing when PDCCH skipping and/or SSSG switching are not set. In this way, when the UE 100 (the control unit 120) performs CG transmission and the PDCCH monitoring state is the PDCCH skipping state, the UE 100 may control the CG-induced switching process based on the switching control information.
  • the PDCCH monitoring state applies the SSSG whose search space cycle is equal to or greater than a predetermined value among a plurality of search space set groups (SSSG) having different search space cycles. If it is, the CG-induced switching process may be controlled based on the switching control information.
  • the switching control information may contain information indicating a predetermined value.
  • the UE 100 may perform the CG-induced switching process only when the switching control information indicates that the execution of the CG-induced switching process (or the CG-induced switching) is enabled.
  • the UE 100 control unit 120
  • the predefined PDCCH monitoring state may be the default SSSG described above.
  • the UE 100 when the PDCCH monitoring state (for example, SSSG) of the switching destination by the CG-induced switching process is designated (set) by the switching control information, the PDCCH monitoring state designated (set) by the switching control information. You can switch to For example, if the switching control information designates (sets) an index indicating the SSSG after switching by the CG-induced switching process, the UE 100 (control unit 120) switches to the SSSG indicated by the index.
  • the PDCCH monitoring state for example, SSSG
  • the switching control information designates (sets) an index indicating the SSSG after switching by the CG-induced switching process
  • step S108 the base station 200 (transmitting unit 211) transmits acknowledgment information (ACK or NACK) to the UE 100 according to the reception status of uplink data by CG transmission.
  • ACK acknowledgment information
  • an operation sequence example 2 relating to the CG-induced switching process according to the present embodiment will be described mainly with respect to differences from the operation sequence example 1 described above.
  • the UE 100 (control unit 120) switches the PDCCH monitoring state before CG transmission by performing CG-induced switching processing in response to a CG transmission trigger.
  • steps S111 to S115 are the same as the operations from steps S101 to S105 in FIG.
  • step S116 the UE 100 (control unit 120) switches the PDCCH monitoring state according to the CG transmission trigger (CG-induced switching processing).
  • steps S117 and S118 are the same as the operations of steps S107 and S108 in FIG.
  • the CG-induced switching process can be started at an earlier stage than the operation sequence example 1 described above.
  • the UE 100 if it takes a certain amount of time to switch the PDCCH monitoring state in the CG-induced switching process, starting the CG-induced switching process after transmitting the CG may not be in time to receive the acknowledgment information from the base station 200. There is Therefore, the acknowledgment information from the base station 200 can be received more reliably by starting the CG-induced switching process before CG transmission.
  • the base station 200 may set in the UE 100 whether the CG-induced switching process should be triggered by CG transmission (that is, after CG transmission) or by a CG transmission trigger (that is, before CG transmission).
  • the base station 200 (transmitting unit 211) may transmit switching control information including information for setting whether the CG-induced switching process is triggered by CG transmission or by a CG transmission trigger to the UE 100 by an RRC message. good.
  • the CG-induced switching process is a process of switching the PDCCH monitoring state from the first monitoring state to the second monitoring state.
  • the first monitoring state corresponds to the power saving state described above.
  • the first monitoring state is a state in which PDCCH is monitored in a first period
  • the second monitoring state is a state in which PDCCH is monitored in a second period shorter than the first period. .
  • UE 100 receives a switching instruction DCI that instructs SSSG from base station 200 in downlink BWP in a serving cell.
  • the UE 100 (control unit 120) starts applying the instructed SSSG (that is, starts the first monitoring state) in response to receiving the switching instruction DCI.
  • the UE 100 (control unit 120) starts a first timer that determines the duration of the first monitoring state when starting the first monitoring state.
  • a period Z for example, is set as a timer value in the first timer.
  • the timer value (timer set value) of the first timer may be set from the base station 200 to the UE 100 by an RRC message.
  • the UE 100 transmits uplink data to the base station 200 by CG transmission in the uplink BWP in the serving cell.
  • the UE 100 (control unit 120) performs CG-induced switching processing for switching to a predetermined SSSG in response to CG transmission or a CG transmission trigger (that is, starts the second monitoring state).
  • the predetermined SSSG may be an SSSG set by the base station 200 according to switching control information, a default SSSG (defaultSearchSpaceSet), or a first SSSG (firstSearchSpaceSet).
  • the UE 100 stops the first timer when performing the CG-induced switching process. Stopping the first timer prevents switching to the default SSSG due to expiration of the first timer.
  • the UE 100 (control unit 120) starts a second timer that determines the duration of the second monitoring state when performing the CG-induced switching process.
  • a period Y for example, is set as a timer value in the second timer.
  • the timer value (timer setting value) of the second timer may be set from the base station 200 to the UE 100 by an RRC message.
  • the UE 100 (control unit 120) starts the second timer in which the timer value is set when performing the CG-induced switching process. This allows the base station 200 to control the duration of the second monitoring state.
  • the UE 100 may restart the second timer in response to CG transmission or a CG transmission trigger in the second monitoring state. Since data communication occurs due to CG transmission, the duration of the second monitoring state can be extended by restarting the second timer.
  • the UE 100 switches to a predetermined PDCCH monitoring state upon expiration of the second timer. That is, the UE 100 (control unit 120) terminates the second monitoring state when the period Y expires.
  • the predetermined PDCCH monitoring state to switch to upon expiration of the second timer may be the default SSSG (defaultSearchSpaceSet) or the first SSSG (firstSearchSpaceSet).
  • the first monitoring state is a state in which PDCCH is not monitored (that is, PDCCH skipping state), and the second monitoring state is a state in which PDCCH is periodically monitored.
  • UE 100 receives from base station 200 a switching instruction DCI that instructs PDCCH skipping in downlink BWP in a certain serving cell.
  • the UE 100 starts PDCCH skipping (that is, starts the first monitoring state) in response to receiving the switching instruction DCI.
  • the UE 100 starts a first timer that determines the duration of the first monitoring state when starting the first monitoring state.
  • a period X for example, is set as a timer value in the first timer.
  • the timer value (timer set value) of the first timer may be set from the base station 200 to the UE 100 by an RRC message.
  • the UE 100 transmits uplink data to the base station 200 by CG transmission in the uplink BWP in the serving cell.
  • the UE 100 (control unit 120) performs CG-induced switching processing for switching to a predetermined SSSG in response to CG transmission or a CG transmission trigger (that is, starts the second monitoring state).
  • a predetermined SSSG may be an SSSG set by the base station 200 according to switching control information, a default SSSG (defaultSearchSpaceSet), or a first SSSG (firstSearchSpaceSet).
  • the UE 100 stops the first timer when performing the CG-induced switching process. Stopping the first timer prevents switching to the default SSSG due to expiration of the first timer.
  • the UE 100 (control unit 120) starts a second timer that determines the duration of the second monitoring state when performing the CG-induced switching process.
  • a period Y for example, is set as a timer value in the second timer.
  • the timer value (timer setting value) of the second timer may be set from the base station 200 to the UE 100 by an RRC message.
  • the UE 100 (control unit 120) starts the second timer in which the timer value is set when performing the CG-induced switching process. This allows the base station 200 to control the duration of the second monitoring state.
  • the UE 100 may restart the second timer in response to CG transmission or a CG transmission trigger in the second monitoring state. Since data communication occurs due to CG transmission, the duration of the second monitoring state can be extended by restarting the second timer.
  • the UE 100 switches to a predetermined PDCCH monitoring state upon expiration of the second timer. That is, the UE 100 (control unit 120) terminates the second monitoring state when the period Y expires.
  • the predetermined PDCCH monitoring state to switch to upon expiration of the second timer may be the default SSSG (defaultSearchSpaceSet) or the first SSSG (firstSearchSpaceSet).
  • the base station 200 transmits an RRC message to the UE100.
  • the RRC message may be a dedicated RRC message (eg, RRCReconfiguration message) sent for each UE.
  • UE 100 receives the RRC message.
  • the RRC message may include common parameters that are commonly applied to switching processes corresponding to multiple types of uplink transmission.
  • the RRC message may also include SR configuration, which configures parameters for SR resources.
  • the SR configuration may include switching control information for controlling SR-triggered switching processing.
  • the switching control information included in the SR configuration may be individual parameters applied to the SR-triggered switching process. By this means, it is possible to efficiently set the switching control information for controlling the SR-caused switching process for the UE 100 .
  • common parameters that are commonly applied to switching processing according to other uplink transmissions may be included, for example, in the PDCCH configuration (PDCCH-Config).
  • the switching control information may be individual parameters applied to the SR-triggered switching process.
  • An SR configuration may include multiple SR resource configurations each associated with a logical channel.
  • Each of the multiple SR resource configurations may include switching control information. This makes it possible to independently control the SR-induced switching process for each logical channel.
  • the switching control information may be information regarding whether to enable the SR-based switching process.
  • the switching control information may include 1-bit flag information indicating whether to enable or disable the SR-based switching process. This enables the base station 200 to control whether or not the UE 100 performs the SR-induced switching process.
  • the switching control information may be information specifying the PDCCH monitoring state after switching by the SR-based switching process.
  • the switching control information may include an index indicating the SSSG after switching by the SR-based switching process. This enables the base station 200 to specify the PDCCH monitoring state (for example, SSSG) of the switching destination when the UE 100 performs the SR-induced switching process.
  • the UE 100 may control not to perform the SR-induced switching process when the RRC message does not contain switching control information. For example, the UE 100 (control unit 120) is not set to enable the SR-triggered switching process, and/or the PDCCH monitoring state (for example, SSSG) of the switching destination when performing the SR-triggered switching process is set. If not, even if SR is transmitted, SR-based switching processing is not performed. This can prevent the actual PDCCH monitoring state in UE 100 and the PDCCH monitoring state recognized by base station 200 from being inconsistent.
  • the PDCCH monitoring state for example, SSSG
  • step S202 the base station 200 (transmitting section 211) transmits a switching instruction DCI instructing PDCCH skipping or SSSG switching to the UE 100 on the PDCCH.
  • UE 100 receives the switching instruction DCI.
  • step S203 the UE 100 (control unit 120) switches the PDCCH monitoring state in response to receiving the switching instruction DCI.
  • UE 100 control section 120
  • switching instruction DCI skip instruction DCI
  • SSSG switching is set, the UE 100 (control unit 120) may switch to the SSSG indicated by the switching instruction DCI in response to receiving the switching instruction DCI.
  • UE 100 enters a power saving state in which power consumption required for PDCCH monitoring is reduced.
  • step S204 the UE 100 (control unit 120) detects an SR transmission trigger.
  • the SR transmission trigger is that the uplink data to be transmitted to the base station 200 and / or the BSR is generated, the uplink data to be transmitted to the base station 200 has arrived at the MAC layer of the UE 100, and the MAC layer in the UE 100 to instruct the SR transmission to the physical (PHY) layer.
  • step S205 the UE 100 (transmitting unit 111) transmits SR to the base station 200 on the PUCCH in response to the SR transmission trigger based on the SR setting set in step S101.
  • the UE 100 transmits SR using SR resource configuration corresponding to a logical channel targeted for SR transmission, that is, a logical channel for transmitting uplink data.
  • the base station 200 receives the SR.
  • the UE 100 switches the PDCCH monitoring state according to SR transmission (SR-induced switching processing).
  • the SR-caused switching process is a process of switching the PDCCH monitoring state from the first monitoring state to the second monitoring state.
  • the first monitoring state corresponds to the power saving state described above.
  • the second monitoring state is a state in which the PDCCH is monitored more frequently than in the first monitoring state. This makes it easier to deal with wireless communication (data communication) that occurs after the transmission of the SR. That is, UE 100 (control unit 120) may perform the above-described PDCCH skipping and/or SSSG switching based on SR transmission (or SR transmission trigger).
  • the SR-triggered switching process may also correspond to PDCCH skipping and/or SSSG switching based on SR transmissions (or SR transmission triggers).
  • the first monitoring state may be a state in which PDCCH is monitored in a first period
  • the second monitoring state may be a state in which PDCCH is monitored in a second period shorter than the first period.
  • UE 100 control unit 120
  • SSSG switching is set, after DCI instructs switching to SSSG having a long PDCCH monitoring cycle, in response to the transmission of SR, SSSG having a short PDCCH monitoring cycle switch to
  • the first monitoring state may be a state in which PDCCH is not monitored (that is, PDCCH skipping), and the second monitoring state may be a state in which PDCCH is periodically monitored.
  • the UE 100 (control unit 120) is configured with PDCCH skipping, and after being instructed by the DCI to perform PDCCH skipping, switches to the state of monitoring the PDCCH in response to SR transmission.
  • the UE 100 may perform SR-induced switching processing only when performing SR transmission when the UE 100 itself is in the power saving state. That is, the UE 100 (control unit 120) does not need to perform SR-induced switching processing when performing SR transmission when the UE 100 itself is not in the power saving state.
  • the UE 100 (control unit 120) may perform SR-induced switching processing only when performing SR transmission in a state in which PDCCH skipping and/or SSSG switching are set. That is, UE 100 (control unit 120) does not need to perform SR-induced switching processing when PDCCH skipping and/or SSSG switching are not set.
  • the UE 100 may perform the SR-induced switching process only when the switching control information indicates that the SR-induced switching process is enabled.
  • the UE 100 controls the SR-induced switching process based on the switching control information indicating that the SR-induced switching process is enabled, the UE 100 switches to a predetermined PDCCH monitoring state in the SR-induced switching process.
  • the predefined PDCCH monitoring state may be the default SSSG described above.
  • the UE 100 may switch to the PDCCH monitoring state specified by the switching control information.
  • the switching control information includes an index indicating the SSSG after switching by the SR-based switching process
  • the UE 100 switches to the SSSG indicated by the index.
  • UE 100 When switching control information is set for each logical channel, UE 100 (control unit 120) performs SR-induced switching based on switching control information corresponding to one logical channel in response to SR transmission in one logical channel. processing may be controlled. For example, when switching control information is set for each of logical channels #0 to #4 of UE 100 and SR is transmitted for logical channel #1, UE 100 (control unit 120) corresponds to logical channel #1.
  • the switching control information is used to control the SR-caused switching process. As a result, the SR-caused switching process can be appropriately controlled for each logical channel.
  • the UE 100 can transmit not only positive SRs but also negative SRs.
  • a positive SR may be an SR set to "1" and a negative SR may be an SR set to "0".
  • positive SR may be used to request uplink shared channel (UL-SCH) resources
  • negative SR may be used to not request uplink shared channel (UL-SCH) resources.
  • the UE 100 controls not to perform the SR-induced switching process. That is, the UE 100 (control unit 120) performs SR-induced switching processing only when transmitting a positive SR to the base station 200.
  • step S207 the base station 200 (control unit 230) allocates UL-SCH resources to UE100 in response to receiving an SR from UE100. Specifically, base station 200 (transmitting section 211) transmits a scheduling DCI including a UL grant for allocating UL-SCH resources to UE 100 on PDCCH.
  • an operation sequence example 2 relating to the SR-caused switching process according to the present embodiment will be described mainly with respect to differences from the operation sequence example 1 described above.
  • the UE 100 (control unit 120) switches the PDCCH monitoring state before SR transmission by performing SR-caused switching processing in response to an SR transmission trigger.
  • steps S211 to S214 are the same as the operations in steps S201 to S204 in FIG.
  • step S215 the UE 100 (control unit 120) switches the PDCCH monitoring state according to the SR transmission trigger (SR-induced switching processing).
  • step S216 the UE 100 (transmitting section 111) transmits SR to the base station 200 on PUCCH.
  • step S217 the base station 200 (control unit 230) allocates UL-SCH resources to UE100 in response to receiving the SR from UE100.
  • the SR-caused switching process can be started at an earlier stage than the operation sequence example 1 described above.
  • the UE 100 if it takes a certain time to switch the PDCCH monitoring state in the SR-induced switching process, starting the SR-induced switching process after transmitting the SR may not be in time to receive the UL grant from the base station 200. There is Therefore, the UL grant from the base station 200 can be received more reliably by starting the SR-caused switching process before transmitting the SR.
  • the base station 200 may set in the UE 100 whether the SR-induced switching process is triggered by SR transmission (that is, after SR transmission) or by an SR transmission trigger (that is, before SR transmission).
  • the base station 200 (transmitting unit 211) may transmit switching control information including information for setting whether the SR-based switching process is triggered by SR transmission or by an SR transmission trigger to the UE 100 by an RRC message. good.
  • the SR-caused switching process is a process of switching the PDCCH monitoring state from the first monitoring state to the second monitoring state.
  • the first monitoring state corresponds to the power saving state described above.
  • the first monitoring state is a state in which PDCCH is monitored in a first period
  • the second monitoring state is a state in which PDCCH is monitored in a second period shorter than the first period. .
  • UE 100 receives a switching instruction DCI that instructs SSSG from base station 200 in downlink BWP in a serving cell.
  • the UE 100 (control unit 120) starts applying the instructed SSSG (that is, starts the first monitoring state) in response to receiving the switching instruction DCI.
  • the UE 100 (control unit 120) starts a first timer that determines the duration of the first monitoring state when starting the first monitoring state.
  • a period Z for example, is set as a timer value in the first timer.
  • the timer value (timer set value) of the first timer may be set from the base station 200 to the UE 100 by an RRC message.
  • UE 100 transmits SR to base station 200 on PUCCH in uplink BWP in the serving cell.
  • the UE 100 (control unit 120) performs SR-induced switching processing for switching to a predetermined SSSG in response to SR transmission or an SR transmission trigger (that is, starts the second monitoring state).
  • the predetermined SSSG may be an SSSG set by the base station 200 through SR setting, a default SSSG (defaultSearchSpaceSet), or a first SSSG (firstSearchSpaceSet).
  • the UE 100 stops the first timer when performing the SR-caused switching process. Stopping the first timer prevents switching to the default SSSG due to expiration of the first timer.
  • the UE 100 (control unit 120) starts a second timer that determines the duration of the second monitoring state when performing the SR-caused switching process.
  • a period Y for example, is set as a timer value in the second timer.
  • the timer value (timer setting value) of the second timer may be set from the base station 200 to the UE 100 by an RRC message.
  • the UE 100 (control unit 120) starts the second timer in which the timer value is set when performing the SR-induced switching process. This allows the base station 200 to control the duration of the second monitoring state.
  • the UE 100 receives the scheduling DCI (for example, the DCI format used for PDSCH scheduling or the DCI format used for PUSCH scheduling) used for radio resource allocation from the base station 200.
  • the UE 100 may restart the second timer upon receiving the scheduling DCI. Since data communication occurs upon receipt of the scheduling DCI, the duration of the second monitoring state can be extended by restarting the second timer. Also, the UE 100 (control unit 120) may restart the second timer in response to SR transmission or an SR transmission trigger in the second monitoring state. Since data communication occurs due to SR transmission, the duration of the second monitoring state can be extended by restarting the second timer.
  • the UE 100 switches to a predetermined PDCCH monitoring state upon expiration of the second timer. That is, the UE 100 (control unit 120) terminates the second monitoring state when the period Y expires.
  • the predetermined PDCCH monitoring state to switch to upon expiration of the second timer may be the default SSSG (defaultSearchSpaceSet) or the first SSSG (firstSearchSpaceSet).
  • the first monitoring state is a state in which PDCCH is not monitored (that is, PDCCH skipping), and the second monitoring state is a state in which PDCCH is periodically monitored.
  • UE 100 receives from base station 200 a switching instruction DCI that instructs PDCCH skipping in downlink BWP in a certain serving cell.
  • the UE 100 starts PDCCH skipping (that is, starts the first monitoring state) in response to receiving the switching instruction DCI.
  • the UE 100 starts a first timer that determines the duration of the first monitoring state when starting the first monitoring state.
  • a period X for example, is set as a timer value in the first timer.
  • the timer value (timer set value) of the first timer may be set from the base station 200 to the UE 100 by an RRC message.
  • UE 100 transmits SR to base station 200 on PUCCH in uplink BWP in the serving cell.
  • the UE 100 (control unit 120) performs SR-induced switching processing for switching to a predetermined SSSG in response to SR transmission or an SR transmission trigger (that is, starts the second monitoring state).
  • a predetermined SSSG may be an SSSG set by the base station 200 through SR setting, a default SSSG (defaultSearchSpaceSet), or a first SSSG (firstSearchSpaceSet).
  • the UE 100 stops the first timer when performing the SR-caused switching process. Stopping the first timer prevents switching to the default SSSG due to expiration of the first timer.
  • the UE 100 (control unit 120) starts a second timer that determines the duration of the second monitoring state when performing the SR-caused switching process.
  • a period Y for example, is set as a timer value in the second timer.
  • the timer value (timer setting value) of the second timer may be set from the base station 200 to the UE 100 by an RRC message.
  • the UE 100 (control unit 120) starts the second timer in which the timer value is set when performing the SR-induced switching process. This allows the base station 200 to control the duration of the second monitoring state.
  • the UE 100 receives the scheduling DCI (for example, the DCI format used for PDSCH scheduling or the DCI format used for PUSCH scheduling) used for radio resource allocation from the base station 200.
  • the UE 100 may restart the second timer upon receiving the scheduling DCI. Since data communication occurs upon receipt of the scheduling DCI, the duration of the second monitoring state can be extended by restarting the second timer. Also, the UE 100 (control unit 120) may restart the second timer in response to SR transmission or an SR transmission trigger in the second monitoring state. Since data communication occurs due to SR transmission, the duration of the second monitoring state can be extended by restarting the second timer.
  • the UE 100 switches to a predetermined PDCCH monitoring state upon expiration of the second timer. That is, the UE 100 (control unit 120) terminates the second monitoring state when the period Y expires.
  • the predetermined PDCCH monitoring state to switch to upon expiration of the second timer may be the default SSSG (defaultSearchSpaceSet) or the first SSSG (firstSearchSpaceSet).
  • the base station 200 transmits an RRC message to the UE100.
  • the RRC message may be a dedicated RRC message (eg, RRCReconfiguration message) sent for each UE.
  • UE 100 receives the RRC message.
  • the RRC message may include common parameters that are commonly applied to switching processes corresponding to multiple types of uplink transmission.
  • the RRC message may also include a BFR setting that configures RACH resources for beam failure recovery (BFR) and reference signal resources for detecting beam failures.
  • BFR beam failure recovery
  • the RACH configuration may include switching control information for controlling the RACH-triggered switching process.
  • the switching control information included in the BFR configuration may be individual parameters applied to the RACH-triggered switching process. Thereby, the switching control information for controlling the RACH-induced switching process can be efficiently set for the UE 100 .
  • the MAC layer of the UE 100 monitors the reference signal in the reference signal resource set by the BFR setting for the primary cell, and if the physical layer detects a beam failure instance only a predetermined number of times within a predetermined time, the primary cell In response, the RACH procedure is started using the RACH resources configured by the BFR configuration.
  • the switching control information may be individual parameters applied to the ACH-triggered switching process.
  • a BFR configuration may include multiple BFR resource configurations each associated with a RACH preamble.
  • Each of the multiple RACH resource configurations may include switching control information. This makes it possible to independently control the RACH-induced switching process for each RACH preamble.
  • the switching control information may be information regarding whether to enable RACH-based switching processing.
  • the switching control information may include 1-bit flag information indicating whether to enable or disable the RACH-induced switching process. This enables the base station 200 to control whether or not the UE 100 performs RACH-induced switching processing.
  • the switching control information may be information specifying the PDCCH monitoring state after switching by RACH-based switching processing.
  • the switching control information may include an index indicating the SSSG after switching by the RACH-triggered switching process. This enables the base station 200 to specify the PDCCH monitoring state (for example, SSSG) of the switching destination when the UE 100 performs the RACH-induced switching process.
  • the UE 100 may control not to perform the RACH-induced switching process when the RRC message does not contain switching control information. For example, the UE 100 (control unit 120) is not set to enable the RACH-induced switching process, and / or the PDCCH monitoring state of the switching destination when performing the RACH-induced switching process (for example, SSSG) is set. If not, RACH-induced switching processing is not performed even if RACH is transmitted. This can prevent the actual PDCCH monitoring state in UE 100 and the PDCCH monitoring state recognized by base station 200 from being inconsistent.
  • step S302 the base station 200 (transmitting section 211) transmits a switching instruction DCI that instructs PDCCH skipping or SSSG switching to the UE 100 on the PDCCH.
  • UE 100 receives the switching instruction DCI.
  • step S303 the UE 100 (control unit 120) switches the PDCCH monitoring state in response to receiving the switching instruction DCI.
  • UE 100 control section 120
  • switching instruction DCI skip instruction DCI
  • SSSG switching is set, the UE 100 (control unit 120) may switch to the SSSG indicated by the switching instruction DCI in response to receiving the switching instruction DCI.
  • UE 100 enters a power saving state in which power consumption required for PDCCH monitoring is reduced.
  • step S304 the UE 100 (control unit 120) detects a RACH transmission trigger.
  • the RACH transmission trigger is that the MAC layer of UE 100 detects a beam failure for the primary cell, that there is no PUCCH resource for SR for the logical channel corresponding to the uplink data that occurred in UE 100, MAC layer to physical layer in UE 100 to indicate RACH transmission.
  • step S305 the UE 100 (transmitting section 111) transmits the RACH preamble to the base station 200 on the PRACH in response to the RACH transmission trigger, based on the RACH settings set in step S301.
  • UE 100 controls RACH-induced switching processing based on switching control information corresponding to one RACH preamble in response to transmission of one RACH preamble or a transmission trigger configured in BFR configuration.
  • the base station 200 receives the RACH.
  • step S306 the UE 100 (control unit 120) switches the PDCCH monitoring state according to RACH transmission (RACH-induced switching processing).
  • the RACH-induced switching process is a process of switching the PDCCH monitoring state from the first monitoring state to the second monitoring state.
  • the first monitoring state corresponds to the power saving state described above.
  • the second monitoring state is a state in which the PDCCH is monitored more frequently than in the first monitoring state. This makes it easier to cope with wireless communication (data communication) that occurs after transmission of RACH. That is, UE 100 (control section 120) may perform the above-described PDCCH skipping and/or SSSG switching based on RACH transmission (or RACH transmission trigger).
  • the RACH-triggered switching process may also correspond to PDCCH skipping and/or SSSG switching based on RACH transmission (or RACH transmission triggers).
  • the first monitoring state may be a state in which PDCCH is monitored in a first period
  • the second monitoring state may be a state in which PDCCH is monitored in a second period shorter than the first period.
  • UE 100 control unit 120
  • SSSG switching is set, after DCI instructs switching to SSSG having a long PDCCH monitoring cycle, in response to the transmission of RACH, SSSG having a short PDCCH monitoring cycle switch to
  • the first monitoring state may be a state in which PDCCH is not monitored (that is, PDCCH skipping), and the second monitoring state may be a state in which PDCCH is periodically monitored.
  • the UE 100 (control unit 120) is configured with PDCCH skipping, and after being instructed by the DCI to perform PDCCH skipping, switches to a state of monitoring the PDCCH in response to transmission of the RACH.
  • the UE 100 may perform RACH-induced switching processing only when performing RACH transmission when the UE 100 itself is in the power saving state. That is, the UE 100 (control unit 120) does not need to perform RACH-induced switching processing when performing RACH transmission when the UE 100 itself is not in the power saving state.
  • UE 100 may perform RACH-induced switching processing only when RACH transmission is performed in a state in which PDCCH skipping and/or SSSG switching are configured. That is, UE 100 (control unit 120) does not need to perform RACH-induced switching processing when PDCCH skipping and/or SSSG switching are not configured.
  • the UE 100 may perform the RACH-induced switching process only when the switching control information indicates that the RACH-induced switching process is enabled.
  • the UE 100 controls the UE 100 to a predetermined PDCCH monitoring state in the RACH-induced switching process.
  • the predefined PDCCH monitoring state may be the default SSSG described above.
  • the UE 100 may switch to the PDCCH monitoring state specified by the switching control information.
  • the switching control information includes an index indicating the SSSG after switching by the RACH-induced switching process
  • the UE 100 switches to the SSSG indicated by the index.
  • UE 100 When switching control information is set for each RACH preamble, UE 100 (control unit 120) performs RACH-induced switching processing based on switching control information corresponding to one RACH preamble in response to transmission of one RACH preamble. may be controlled. For example, when switching control information is set for each of RACH preambles #0 to #4 set in UE 100, and RACH transmission is performed using RACH preamble #1, UE 100 (control unit 120) uses RACH preamble #1. The corresponding switching control information is used to control the RACH-triggered switching process. As a result, the RACH-induced switching process can be appropriately controlled for each RACH preamble.
  • step S307 the base station 200 (control unit 230) allocates UL-SCH resources to UE100 in response to receiving the RACH preamble from UE100. Specifically, base station 200 (transmitting section 211) transmits a scheduling DCI including a UL grant for allocating UL-SCH resources to UE 100 on PDCCH.
  • an operation sequence example 2 relating to the RACH-caused switching process according to the present embodiment will be described mainly with respect to differences from the operation sequence example 1 described above.
  • the UE 100 (control unit 120) switches the PDCCH monitoring state before transmitting the RACH preamble by performing RACH-induced switching processing in response to the RACH transmission trigger.
  • steps S311 to S314 are the same as the operations in steps S301 to S304 in FIG.
  • step S315 the UE 100 (control unit 120) switches the PDCCH monitoring state according to the RACH transmission trigger (RACH-induced switching processing).
  • step S316 the UE 100 (transmitting section 111) transmits the RACH preamble to the base station 200 on the PRACH.
  • step S317 the base station 200 (control unit 230) allocates UL-SCH resources to UE100 in response to receiving the RACH preamble from UE100.
  • the RACH-induced switching process can be started at an earlier stage than the operation sequence example 1 described above.
  • the UE 100 if it takes a certain time to switch the PDCCH monitoring state in the RACH-induced switching process, starting the RACH-induced switching process after transmitting the RACH preamble may not be in time to receive the UL grant from the base station 200. have a nature. Therefore, by starting the RACH-induced switching process before transmitting the RACH preamble, the UL grant from the base station 200 can be received more reliably.
  • the base station 200 may set in the UE 100 whether the RACH-induced switching process is triggered by RACH transmission (that is, after RACH preamble transmission) or by a RACH transmission trigger (that is, before RACH preamble transmission).
  • the base station 200 (transmitting section 211) may transmit switching control information including information for setting whether the RACH-induced switching process is triggered by RACH transmission or by a RACH transmission trigger by an RRC message to the UE 100. good.
  • an operation sequence example 3 relating to the RACH-caused switching process according to the present embodiment will be described mainly on differences from the operation sequence examples 1 and 2 described above.
  • the UE 100 (control unit 120) performs RACH-induced switching processing in response to receiving MAC CE including switching control information from the base station 200 in the RACH procedure, thereby ending the RACH procedure. switch the PDCCH monitoring state at any time.
  • the operations of steps S301 to S303 of FIG. 22 may be performed prior to the operation of FIG. 24, the operations of steps S301 to S303 of FIG. 22 may be performed.
  • step S331 the UE 100 (control unit 120) detects a RACH transmission trigger.
  • the RACH transmission trigger is that the MAC layer of UE 100 detects a beam failure for the primary cell, that there is no PUCCH resource for SR for the logical channel corresponding to the uplink data that occurred in UE 100, MAC layer to physical layer in UE 100 to indicate RACH transmission.
  • step S332 the UE 100 (transmitting section 111) transmits the RACH preamble to the base station 200 on the PRACH based on the RACH settings set by the base station 200.
  • Base station 200 receives the RACH preamble.
  • a RACH preamble for BFR is applied.
  • the base station 200 (control unit 230) can recognize that the UE 100 has started the RACH procedure for BFR in response to receiving the RACH preamble for BFR from the UE 100.
  • transmission of the RACH preamble is referred to as Msg1 in the RACH procedure.
  • the UE 100 (control unit 120) may perform the RACH-triggered switching process in accordance with the RACH transmission trigger or RACH transmission, as in the operation sequence examples 1 and 2 described above.
  • step S333 the base station 200 (control unit 230) allocates UL-SCH resources to UE100 in response to receiving the RACH preamble from UE100. Specifically, base station 200 (transmitting section 211) transmits a scheduling DCI including a UL grant for allocating UL-SCH resources to UE 100 on PDCCH. UE 100 (receiving unit 112) receives the scheduling DCI including the UL grant. Transmission of UL grant is referred to as Msg2 in RACH procedure.
  • step S334 the UE 100 (transmitting section 111) performs uplink transmission using the UL-SCH resources allocated by the UL grant from the base station 200.
  • the base station 200 receives uplink transmission.
  • Such uplink transmission is called Msg3 in the RACH procedure.
  • step S335 the base station 200 (transmitting unit 211) performs downlink transmission to the UE100.
  • the UE 100 (receiving unit 112) receives downlink transmission.
  • Such downlink transmission is called Msg4 in the RACH procedure.
  • the base station 200 (transmitting section 211) transmits to the UE 100 MAC CE including switching control information specifying the PDCCH monitoring state after switching (for example, SSSG).
  • UE 100 (receiving unit 112) receives the MAC CE. That is, after performing RACH transmission, UE 100 (receiving section 112) receives MAC CE including switching control information from base station 200 in the RACH procedure.
  • step S336 the UE 100 (control unit 120) performs RACH-based switching processing in response to receiving MAC CE. Specifically, the UE 100 (control unit 120) switches to the PDCCH monitoring state (for example, SSSG) specified by the switching control information included in MAC CE.
  • the PDCCH monitoring state for example, SSSG
  • the base station 200 may transmit MAC CE including switching control information in Msg2.
  • the RACH-induced switching process is a process of switching the PDCCH monitoring state from the first monitoring state to the second monitoring state.
  • the first monitoring state corresponds to the power saving state described above.
  • the first monitoring state is a state in which PDCCH is monitored in a first period
  • the second monitoring state is a state in which PDCCH is monitored in a second period shorter than the first period. .
  • UE 100 receives a switching instruction DCI that instructs SSSG from base station 200 in downlink BWP in a serving cell.
  • the UE 100 (control unit 120) starts applying the instructed SSSG (that is, starts the first monitoring state) in response to receiving the switching instruction DCI.
  • the UE 100 (control unit 120) starts a first timer that determines the duration of the first monitoring state when starting the first monitoring state.
  • a period Z for example, is set as a timer value in the first timer.
  • the timer value (timer set value) of the first timer may be set from the base station 200 to the UE 100 by an RRC message.
  • UE 100 transmits a RACH preamble to base station 200 on PRACH in uplink BWP in the serving cell.
  • the UE 100 (control unit 120) performs RACH-induced switching processing for switching to a predetermined SSSG in response to RACH transmission or a RACH transmission trigger (that is, starts the second monitoring state).
  • the predetermined SSSG may be an SSSG set by the base station 200 through RACH setting, a default SSSG (defaultSearchSpaceSet), or a first SSSG (firstSearchSpaceSet).
  • the UE 100 stops the first timer when performing the RACH-triggered switching process. Stopping the first timer prevents switching to the default SSSG due to expiration of the first timer.
  • the UE 100 (control unit 120) starts a second timer that determines the duration of the second monitoring state when performing RACH-induced switching processing.
  • a period Y for example, is set as a timer value in the second timer.
  • the timer value (timer setting value) of the second timer may be set from the base station 200 to the UE 100 by an RRC message.
  • the UE 100 (control unit 120) starts the second timer in which the timer value is set when performing the RACH-induced switching process. This allows the base station 200 to control the duration of the second monitoring state.
  • the UE 100 receives the scheduling DCI (for example, the DCI format used for PDSCH scheduling or the DCI format used for PUSCH scheduling) used for radio resource allocation from the base station 200.
  • the UE 100 may restart the second timer upon receiving the scheduling DCI. Since data communication occurs upon receipt of the scheduling DCI, the duration of the second monitoring state can be extended by restarting the second timer. Also, the UE 100 (control unit 120) may restart the second timer in response to RACH transmission or RACH transmission trigger in the second monitoring state. Since data communication occurs due to RACH transmission, the duration of the second monitoring state can be extended by restarting the second timer.
  • the UE 100 switches to a predetermined PDCCH monitoring state upon expiration of the second timer. That is, the UE 100 (control unit 120) terminates the second monitoring state when the period Y expires.
  • the predetermined PDCCH monitoring state to switch to upon expiration of the second timer may be the default SSSG (defaultSearchSpaceSet) or the first SSSG (firstSearchSpaceSet).
  • the first monitoring state is a state in which PDCCH is not monitored (that is, PDCCH skipping), and the second monitoring state is a state in which PDCCH is periodically monitored.
  • UE 100 receives from base station 200 a switching instruction DCI that instructs PDCCH skipping in downlink BWP in a certain serving cell.
  • the UE 100 starts PDCCH skipping (that is, starts the first monitoring state) in response to receiving the switching instruction DCI.
  • the UE 100 starts a first timer that determines the duration of the first monitoring state when starting the first monitoring state.
  • a period X for example, is set as a timer value in the first timer.
  • the timer value (timer set value) of the first timer may be set from the base station 200 to the UE 100 by an RRC message.
  • UE 100 transmits a RACH preamble to base station 200 on PRACH in uplink BWP in the serving cell.
  • the UE 100 (control unit 120) performs RACH-induced switching processing for switching to a predetermined SSSG in response to RACH transmission or a RACH transmission trigger (that is, starts the second monitoring state).
  • a predetermined SSSG may be an SSSG set by the base station 200 through RACH setting, a default SSSG (defaultSearchSpaceSet), or a first SSSG (firstSearchSpaceSet).
  • the UE 100 stops the first timer when performing the RACH-triggered switching process. Stopping the first timer prevents switching to the default SSSG due to expiration of the first timer.
  • the UE 100 (control unit 120) starts a second timer that determines the duration of the second monitoring state when performing RACH-induced switching processing.
  • a period Y for example, is set as a timer value in the second timer.
  • the timer value (timer setting value) of the second timer may be set from the base station 200 to the UE 100 by an RRC message.
  • the UE 100 (control unit 120) starts the second timer in which the timer value is set when performing the RACH-induced switching process. This allows the base station 200 to control the duration of the second monitoring state.
  • the timer value of the second timer used for the RACH-triggered switching process may be set in common with the timer value of the second timer used for the above-mentioned SR-triggered switching process by an RRC message.
  • the timer value of the second timer used for the RACH-triggered switching process may be set independently of the timer value of the second timer used for the above-described SR-triggered switching process by an RRC message.
  • the UE 100 receives the scheduling DCI (for example, the DCI format used for PDSCH scheduling or the DCI format used for PUSCH scheduling) used for radio resource allocation from the base station 200.
  • the UE 100 may restart the second timer upon receiving the scheduling DCI. Since data communication occurs upon receipt of the scheduling DCI, the duration of the second monitoring state can be extended by restarting the second timer. Also, the UE 100 (control unit 120) may restart the second timer in response to RACH transmission or RACH transmission trigger in the second monitoring state. Since data communication occurs due to RACH transmission, the duration of the second monitoring state can be extended by restarting the second timer.
  • the UE 100 switches to a predetermined PDCCH monitoring state upon expiration of the second timer. That is, the UE 100 (control unit 120) terminates the second monitoring state when the period Y expires.
  • the predetermined PDCCH monitoring state to switch to upon expiration of the second timer may be the default SSSG (defaultSearchSpaceSet) or the first SSSG (firstSearchSpaceSet).
  • enable or disable switching processing may mean “enable or disable execution of switching processing", and “(according to multiple types of uplink transmission enable or disable switching (at least any of the switching). Further, enabling the switching (or execution of the switching process) may mean that the switching (or execution of the switching process) is set. Further, determination of activation of switching (or execution of switching processing) described above may mean identifying that switching (or execution of switching processing) has been activated.
  • uplink transmission may be replaced with “voluntary uplink transmission”.
  • the operation sequences (and operation flows) in the above-described embodiments do not necessarily have to be executed in chronological order according to the order described in the flow diagrams or sequence diagrams. For example, the steps in the operations may be performed out of order or in parallel with the order illustrated in the flow diagrams or sequence diagrams. Also, some steps in the operation may be omitted and additional steps may be added to the process. Further, the operation sequences (and operation flows) in the above-described embodiments may be implemented independently, or two or more operation sequences (and operation flows) may be combined and implemented. For example, some steps of one operation flow may be added to another operation flow, or some steps of one operation flow may be replaced with some steps of another operation flow.
  • 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.
  • IAB Integrated Access and Backhaul
  • the mobile communication system 1 based on NR has been described as an example.
  • 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 (Long Term Evolution) or another generation system (for example, 6th generation) of the 3GPP standards.
  • 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.
  • 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.
  • 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.
  • 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)).
  • “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.
  • “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.
  • “obtain/acquire” may mean obtaining information among stored information, and may mean obtaining information among information received from other nodes.
  • 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.
  • RRC radio resource control
  • the switching control information is included in an information element commonly applicable to the plurality of types of uplink transmission,
  • Appendix 2 The communication device (100) according to appendix 1, wherein the switching control information includes a common parameter commonly applied to the switching process according to the plurality of types of uplink transmission.
  • the switching control information includes individual parameters individually applied to the switching process according to the plurality of types of uplink transmission, 3.
  • the plurality of types of uplink transmission includes uplink transmission based on configured grants (CG: Congiured Grants) from the base station (200), a scheduling request to the base station (200), and physical random access channel (PRACH) transmission.
  • CG Congiured Grants
  • PRACH physical random access channel
  • a base station (200) that performs wireless communication with a communication device (100), a receiving unit (212) that receives radio signals by uplink transmission of multiple types from the communication device (100); Radio resource control including switching control information for controlling switching processing for switching a PDCCH monitoring state related to monitoring of a physical downlink control channel (PDCCH) according to at least one of the plurality of types of uplink transmission
  • a transmitting unit (211) that transmits an (RRC) message to the communication device (100), A base station (200), wherein said switching control information is included in an information element commonly applicable to said plurality of types of uplink transmission.
  • the switching control information includes individual parameters individually applied to the switching process according to the plurality of types of uplink transmission, The base station (200) according to appendix 6 or 7, wherein the individual parameter indicates whether to enable execution of the switching process in at least one of the plurality of types of uplink transmission.
  • the plurality of types of uplink transmission includes uplink transmission based on configured grants (CG: Congiured Grants) from the base station (200), a scheduling request to the base station (200), and physical random access channel (PRACH) transmission.
  • CG Congiured Grants
  • PRACH physical random access channel
  • RRC Radio Resource Control
  • the switching control information is included in an information element commonly applicable to the plurality of types of uplink transmission,
  • the communication method wherein in the step of performing the switching process, the switching process is controlled based on the switching control information.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un dispositif de communication (100) réalisant une communication sans fil avec une station de base (200) comprenant : une unité d'émission (111), qui effectue une pluralité de types d'émissions en liaison montante vers la station de base (200); une unité de commande (120), qui effectue un traitement de commutation pour commuter un état de surveillance de canal physique de commande de liaison descendante (PDCCH) concernant la surveillance d'un PDCCH selon au moins un type de la pluralité de types d'émissions en liaison montante; et une unité de réception (112) recevant, de la station de base (200), un message de commande de ressources radio (RRC) comportant des informations de commande de commutation permettant de commander le traitement de commutation. Les informations de commande de commutation font partie d'un élément d'information couramment applicable à la pluralité de types d'émissions en liaison montante. L'unité de commande (120) commande le traitement de commutation d'après les informations de commande de commutation.
PCT/JP2022/046038 2021-12-17 2022-12-14 Dispositif de communication, station de base et procédé de communication WO2023112960A1 (fr)

Applications Claiming Priority (2)

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JP2021-205576 2021-12-17
JP2021205576 2021-12-17

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WO2023112960A1 true WO2023112960A1 (fr) 2023-06-22

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Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
CATT: "PDCCH monitoring adaptation", 3GPP TSG RAN WG1#104-E R1-2100395, 19 January 2021 (2021-01-19), XP051970998 *
HUAWEI, HISILICON: "Extension(s) to Rel-16 DCI-based power saving adaptation for an active BWP", 3GPP TSG RAN WG1#105-E R1-2104253, 12 May 2021 (2021-05-12), XP052010707 *
LG ELECTRONICS: "Discussion on DCI-based power saving adaptation during DRX Active Time", 3GPP TSG RAN WG1#107-E R1-2112062, 6 November 2021 (2021-11-06), XP052075263 *
OPPO: "Power saving enhancement for connected mode UE", 3GPP TSG RAN WG2#113BIS-E R2-2102735, 2 April 2021 (2021-04-02), XP052174338 *

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