WO2023127636A1 - Dispositif de communication et procédé de communication - Google Patents

Dispositif de communication et procédé de communication Download PDF

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Publication number
WO2023127636A1
WO2023127636A1 PCT/JP2022/047089 JP2022047089W WO2023127636A1 WO 2023127636 A1 WO2023127636 A1 WO 2023127636A1 JP 2022047089 W JP2022047089 W JP 2022047089W WO 2023127636 A1 WO2023127636 A1 WO 2023127636A1
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Prior art keywords
pdcch
switching
monitoring
sssg
state
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PCT/JP2022/047089
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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 WO2023127636A1 publication Critical patent/WO2023127636A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/04—Error control
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present disclosure relates to a communication device and communication method used in a mobile communication system.
  • PDCCH monitoring related to monitoring the physical downlink control channel A process of switching states (hereinafter referred to as switching process) is under consideration.
  • the communication device switches the PDCCH monitoring state to a state in which the PDCCH monitoring cycle is lengthened or PDCCH monitoring is skipped (hereinafter referred to as a PDCCH monitoring skipping state).
  • PDCCH monitoring skipping state a state in which the PDCCH monitoring cycle is lengthened or PDCCH monitoring is skipped.
  • 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.
  • the communication device executes HARQ operation by hybrid automatic repeat request (HARQ) based on downlink control information (DCI) on PDCCH.
  • HARQ hybrid automatic repeat request
  • DCI downlink control information
  • the communication device determines whether data received in downlink communication is initial transmission or retransmission based on a New Data Indicator (NDI) included in DCI, and initially transmits data in uplink communication. or resend.
  • NDI New Data Indicator
  • a communication device is a communication device that performs wireless communication with a base station.
  • the communication device comprises a communication unit for communicating data with the base station, and a control unit for managing a hybrid automatic repeat request (HARQ) process for the data.
  • the control unit switches the PDCCH monitoring state related to monitoring of the physical downlink control channel (PDCCH) to a PDCCH skipping state that skips the monitoring of the PDCCH, and then switches to the state of monitoring the PDCCH.
  • Predetermined control is performed to terminate the HARQ process that was performed prior to the PDCCH skipping state.
  • a communication method is a communication method executed by a communication device that performs wireless communication with a base station.
  • the communication method comprises: communicating data with the base station; managing a hybrid automatic repeat request (HARQ) process for the data; After switching to the PDCCH skipping state in which PDCCH monitoring is skipped, based on the switching to the state of monitoring the PDCCH, predetermined control is performed to terminate the HARQ process performed before the PDCCH skipping state. a step;
  • HARQ hybrid automatic repeat request
  • 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 sequence 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 sequence 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 sequence diagram showing an overview of radio communication operations in the mobile communication system according to the embodiment.
  • FIG. 4 is a diagram showing
  • FIG. 8 is a diagram illustrating an example of timer-based SSSG switching according to an embodiment.
  • FIG. 9 is a diagram showing the configuration of the UE according to the embodiment.
  • FIG. 10 is a diagram showing the configuration of a base station according to the embodiment.
  • FIG. 11 is a sequence diagram for explaining the first operation example of the mobile communication system according to the embodiment.
  • FIG. 12 is a diagram for explaining a first operation example of the mobile communication system according to the embodiment.
  • FIG. 13 is a flowchart for explaining a first operation example of the mobile communication system according to the embodiment.
  • FIG. 14 is a flowchart for explaining a second operation example of the mobile communication system according to the embodiment.
  • the communication device switches the PDCCH monitoring state from the PDCCH monitoring state to the PDCCH skipping state in which PDCCH monitoring is skipped, and then switches from the PDCCH skipping state to the PDCCH monitoring state.
  • the communication device After switching to the PDCCH skipping state, the communication device does not receive the PDCCH until it switches back to the PDCCH monitoring state. Therefore, before switching to the PDCCH skipping state, the communication device switches to the PDCCH skipping state after a certain period of time (that is, the period of the PDCCH skipping state) has passed since wireless communication with the base station, and then switches to the PDCCH skipping state. will receive the DCI. There is a concern that the communication device cannot appropriately perform HARQ operation when restarting HARQ operation after switching the PDCCH skipping state.
  • one object of the present disclosure is to provide a communication device and a communication method that enable the HARQ operation to be performed appropriately when the HARQ operation is restarted after switching the PDCCH skipping state.
  • 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 Quest: 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.
  • UE 100 may monitor a set of PDCCH candidates in a downlink BWP control resource set (CORESET) in a serving cell in which PDCCH monitoring is configured, according to the corresponding search space.
  • 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.
  • the downlink DCI format used for PDSCH scheduling is also called downlink assignment.
  • the uplink DCI format used for PUSCH scheduling is also called an uplink grant.
  • 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)) or MCS-C-RNTI (Modulation and Coding Scheme-C-RNTI) or CS-RNTI assigned to the UE 100 from the base station 200.
  • C-RNTI Cell-Radio Network Temporary Identifier (RNTI)
  • MCS-C-RNTI Modulation and Coding Scheme-C-RNTI
  • CS-RNTI Configured Scheduling-RNTI
  • CRC Cyclic Redundancy Check
  • CRC parity bits scrambled by C-RNTI, MCS-C-RNTI, or CS-RNTI are added to the DCI (that is, DCI format) transmitted from the base station 200. ing. That is, the downlink assignment is appended with CRC parity bits scrambled by C-RNTI, MCS-C-RNTI, or CS-RNTI. Also, CRC parity bits scrambled by C-RNTI, MCS-C-RNTI, or CS-RNTI are added to the uplink grant.
  • 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.
  • a MAC entity which is an entity in the MAC layer, includes a HARQ entity for each serving cell.
  • the MAC entity is included in the DCI when the DCI indicates PDSCH scheduling (specifically, downlink assignment (PDSCH resource assignment), i.e., downlink assignment). HARQ information to be sent to the HARQ entity.
  • the MAC entity also instructs the physical layer to send DL-SCH data (specifically, transport blocks (TB)) to the HARQ entity.
  • the HARQ information includes a New Data Indicator (NDI).
  • NDI is used to indicate (or determine) whether the transmission is an initial transmission or a retransmission.
  • the HARQ entity sends the TB and HARQ information to the corresponding HARQ process.
  • a HARQ process receives a TB and associated HARQ information from a HARQ entity. The HARQ process does the following for each received TB and associated HARQ information.
  • the HARQ process will be toggled if the NDI included in the HARQ information is toggled compared to the NDI of the previously received transmission corresponding to that TB, or if the TB is the first received transmission (i.e. There is no previously received NDI for ), consider the received transmission to be an initial transmission. Otherwise (eg, NDI is not toggled), consider the received transmission as a retransmission. In this way, the UE 100 determines whether data received in downlink communication is initial transmission or retransmission, based on the NDI included in the DCI.
  • the MAC entity may attempt to decode the received data if the transmission is an initial transmission. On the other hand, if the transmission is a retransmission, the MAC entity may instruct the physical layer to combine the received data with the data in the buffer for that TB and attempt to decode the data. The MAC entity sends the decoded data (more specifically, MAC PDU) to upper layers.
  • the MAC entity is an uplink grant. and relevant HARQ information contained in the DCI to the HARQ entity.
  • the HARQ entity For each uplink grant, the HARQ entity identifies the HARQ process associated with the uplink grant. The HARQ entity, for each identified HARQ process, compares the NDI included in the HARQ information with the NDI of the previously received transmission corresponding to that TB, if toggled, to the initial transmission. be considered to be The HARQ entity instructs the identified HARQ processes to obtain data to be transmitted (specifically MAC PDUs) and trigger initial transmission. On the other hand, a HARQ entity considers a received transmission as a retransmission if the NDI included in the HARQ information is toggled. The HARQ entity instructs the identified HARQ processes to trigger retransmissions. In this way, the UE 100 determines whether data received in uplink communication is initial transmission or retransmission, based on the NDI included in the DCI.
  • Each HARQ process is associated with a HARQ buffer.
  • a HARQ process stores data (MAC PDUs) in its associated HARQ buffer when a HARQ entity requests an initial transmission.
  • the HARQ process also stores uplink grants received from HARQ entities when the HARQ entities request initial transmissions and retransmissions.
  • the HARQ process directs the physical layer to generate transmissions according to the stored uplink grants.
  • 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 skipping period.
  • Such 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 generates one or more RRC messages and transmits the generated 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 skipping period during which PDCCH monitoring is skipped.
  • 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 skipping period.
  • the value set in the information field (hereinafter referred to as the PDCCH monitoring adaptation notification field) in the switching instruction DCI that indicates the PDCCH monitoring adaptation (that is, SSSG switching and/or PDCCH skipping) applied by the UE 100 is indicated. It is associated with the operation (behavior) of the UE 100. Operations of the UE 100 may be defined as follows. • PDCCH skipping is not activated on 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 skipping 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 time periods (including skipping 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.
  • the UE 100 After switching to the PDCCH skipping state, the UE 100 does not receive the PDCCH until switching back to the PDCCH monitoring state. Therefore, the UE 100 switches to the PDCCH skipping state after a certain period of time (that is, the period in the PDCCH skipping state) has passed after performing wireless communication with the base station 200 before switching to the PDCCH skipping state, and then switches to the PDCCH skipping state. will receive the DCI.
  • the UE 100 restarts the HARQ operation after switching the PDCCH skipping state, there is a concern that the HARQ operation cannot be properly performed.
  • the UE 100 since the UE 100 has not monitored the PDCCH for a certain period of time, it is possible that the PDCCH (specifically, the NDI indicated by 1 bit) cannot be received normally. In addition, UE 100 may not hold the NDI included in the last received PDCCH because some time has passed since the last PDCCH was received before switching the PDCCH skipping state. In addition, there is a concern that retransmission may be performed inefficiently due to changes in the communication environment (for example, channel state) in the UE 100 before and after switching the PDCCH skipping state. Therefore, in the present embodiment, when the HARQ operation is resumed after switching the PDCCH skipping state, it is possible to appropriately perform the HARQ operation.
  • the PDCCH specifically, the NDI indicated by 1 bit
  • 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.
  • the communication unit 110 communicates data with the base station 200 .
  • the control unit 120 manages the data hybrid automatic repeat request (HARQ) process.
  • the control unit 120 switches the PDCCH monitoring state regarding monitoring of the physical downlink control channel (PDCCH) to a PDCCH skipping state that skips monitoring of the PDCCH, and then switches to a state that monitors the PDCCH.
  • Predetermined control is performed to terminate the HARQ process that was performed prior to the state.
  • UE 100 does not perform retransmission in the HARQ process performed before the PDCCH skipping state. As a result, when the HARQ operation is resumed after switching the PDCCH skipping state, the HARQ operation can be properly 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.
  • 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.
  • the switching control information may be, for example, information for controlling switching processing for switching the PDCCH monitoring state according to at least one of the multiple types of voluntary uplink transmission.
  • the switching control information is included in an information element commonly applicable to multiple types of spontaneous 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.
  • the switching control information may include common parameters (for example, common settings) that are commonly applied to switching processes corresponding to multiple types of voluntary 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
  • the UE 100 can execute various switching processes triggered by at least one of multiple types of spontaneous uplink transmission based on the common parameter. That is, in this embodiment, multiple types of spontaneous uplink transmission may include transmission of a scheduling request (SR). Also, multiple types of spontaneous uplink transmission may include RACH transmission (or PRACH transmission). Also, multiple types of spontaneous uplink transmission may include CG transmission.
  • 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 voluntary 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. In addition, whether the individual parameter enables execution of switching processing in at least one uplink transmission among multiple types of spontaneous uplink transmission (or switching based on multiple types of spontaneous uplink transmission) (or set) or not.
  • the individual parameter may include information (for example, 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 control unit 120
  • 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 when receiving the switching control information, execution of switching processing based on spontaneous uplink transmission (or switching based on spontaneous uplink transmission) is enabled (or set may be determined (or identified) as When receiving the switching control information, the UE 100 (control unit 120) 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 voluntary 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 switching control information may include information indicating a switching timer value for setting a predetermined period for skipping PDCCH monitoring.
  • the PDCCH monitor skipping state may be maintained while the switch timer is running.
  • the switching control information may be information regarding whether to enable (or set) execution of the predetermined control described later.
  • the UE 100 (control unit 120) may perform predetermined control based on switching control information indicating that the predetermined control is enabled.
  • the RRC message may include switching control information for controlling voluntary uplink transmission (or setting to switch the PDCCH monitoring state at a trigger different from the trigger for the uplink transmission).
  • step S102 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.
  • FIG. 12 illustrates a case where switching instruction DCI instructing PDCCH skipping is transmitted to UE 100 on PDCCH.
  • the switching instruction DCI may be an instruction for switching to the PDCCH skipping state in which PDCCH monitoring is skipped as the PDCCH monitoring state.
  • step S103 the UE 100 (control unit 120) switches the PDCCH monitoring state in response to receiving the switching instruction DCI. Specifically, UE 100 (control section 120) switches the PDCCH monitoring state to the PDCCH skipping state. 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 may start a switching timer in response to switching to the PDCCH skipping state.
  • UE 100 (control unit 120) starts a switching timer.
  • step S104 the UE 100 (control unit 120) switches from the PDCCH skipping state to the PDCCH monitoring execution state.
  • the UE 100 (control unit 120) may switch to the PDCCH monitoring execution state, for example, based on expiration of the switching timer.
  • step S105 the UE 100 (communication unit 110) may receive DCI on the PDCCH.
  • step S106 the UE 100 (communication unit 110) performs predetermined control to prevent retransmission of data communicated before the PDCCH skipping state. Specifically, the UE 100 (control unit 120) switches the PDCCH monitoring state to the PDCCH skipping state, and then performs predetermined control based on switching to the PDCCH monitoring execution state. The UE 100 (control unit 120) may perform, for example, the following operations as the predetermined control.
  • the UE 100 may perform predetermined control based on the switching control information.
  • the UE 100 may perform predetermined control, for example, based on switching control information indicating that the predetermined control is enabled.
  • step S111 the UE 100 (communication unit 110) receives PDCCH (corresponding to step S105).
  • step S112 the UE 100 (control unit 120) determines whether the received PDCCH is the first received PDCCH after the PDCCH skipping period (ie skipping period) expires. UE 100 (control unit 120) executes the process of step S113 when the received PDCCH is the first received PDCCH. On the other hand, UE 100 (control unit 120) executes the process of step S114 when the received PDCCH is not the first received PDCCH.
  • the UE 100 may regard transmission of scheduling (downlink assignment and/or uplink grant) indicated by DCI included in PDCCH as initial transmission. That is, the UE 100 (control unit 120), for example, considers that the NDI included in DCI is toggled. That is, UE 100 (control unit 120), for example, when the PDCCH monitoring is performed (or resumed) based on the expiration of the PDCCH skipping period, the DCI format transmitted in the first detected PDCCH (i.e., downlink assignment message and/or uplink grant) may be considered toggled.
  • scheduling downlink assignment and/or uplink grant
  • UE 100 performs (or resumes) monitoring of PDCCH based on the expiration of the PDCCH skipping period, DCI format transmitted in PDCCH (that is, downlink assignment and / or uplink link grant), the NDI may be considered toggled regardless of the value of the NDI.
  • the UE 100 compares the NDI (that is, the value of NDI) included in the DCI with the NDI (that is, the value of NDI) of the transmission corresponding to the previously received TB, and toggles. You can ignore whether or not
  • step S114 the UE 100 (control unit 120) executes HARQ operation.
  • the UE 100 (control unit 120) considers that the NDI included in the DCI has been toggled, so in HARQ operation, the scheduling transmission indicated by the DCI is processed as an initial transmission instead of a retransmission.
  • control unit 120 specifically instructs the physical layer to combine the received data with the data in the buffer for the TB when the scheduling transmission indicated by DCI is PDSCH transmission. You may attempt to decode the data without
  • UE 100 when the scheduling transmission indicated by DCI is PUSCH transmission, UE 100 (control unit 120) stores data (MAC PDU) in the associated HARQ buffer, and stores the stored uplink Instruct the physical layer to generate transmissions according to the link grant.
  • the UE 100 (control unit 120) performs predetermined control to terminate the HARQ process that was performed before the PDCCH skipping state.
  • UE 100 (control section 120) does not perform retransmission in the HARQ process performed before the PDCCH skipping state.
  • the HARQ operation can be properly performed.
  • the UE 100 (control unit 120) can not normally receive the NDI in the PDCCH, even if it does not hold the NDI included in the last received PDCCH before switching the PDCCH skipping state , HARQ operations can be properly performed because retransmissions are not performed in the HARQ process that was performed before the PDCCH skipping state.
  • UE 100 control section 120
  • the HARQ operation can be properly performed.
  • the UE 100 may regard transmission scheduled by DCI as initial transmission regardless of the value of NDI included in DCI. As a result, retransmission is not performed in the HARQ process that was performed before the PDCCH skipping state, so HARQ operation can be properly performed.
  • the UE 100 may perform predetermined control based on the switching control information. This allows the UE 100 to perform predetermined control under the control of the base station 200 .
  • step S201 the PDCCH skipping period (ie skipping period) expires.
  • UE 100 control unit 120 may determine that the PDCCH skipping period has expired, for example, according to expiration of the switching timer.
  • step S202 the UE 100 (control unit 120) flushes the retransmission control buffer. Specifically, the UE 100 (control unit 120) flushes all HARQ buffers. That is, UE 100 (control section 120) may flush HARQ buffers (for example, all HARQ buffers) based on expiration of the PDCCH skipping period.
  • the UE 100 (control unit 120) receives (or may detect) a switching instruction DCI that instructs PDCCH skipping (that is, a PDCCH monitoring adaptation notification field that is set to a value that instructs PDCCH skipping), HARQ Buffers (eg, all HARQ buffers) may be flushed. That is, the UE 100 (control unit 120) may flush HARQ buffers (eg, all HARQ buffers) based on reception of the switching instruction DCI instructing switching to the PDCCH skipping state as the PDCCH monitoring state.
  • UE 100 (control unit 120) does not perform retransmission in the HARQ process that was performed before the PDCCH skipping state because data is not saved in all HARQ buffers.
  • the HARQ operation can be properly performed.
  • Embodiments UE 100 may perform operations different from those described above as predetermined control.
  • the UE 100 may flush all HARQ buffers, for example, in response to starting the switching timer.
  • the UE 100 may perform predetermined control when the PDCCH skipping period is longer than or equal to the predetermined period. UE 100 (control unit 120) does not need to perform predetermined control when the PDCCH skipping period is less than the predetermined period.
  • the UE 100 may receive information indicating the predetermined period from the base station 200.
  • the information may be included in switching control information, for example.
  • 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. 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.
  • the control unit (120) switches the PDCCH monitoring state related to monitoring of the physical downlink control channel (PDCCH) to the PDCCH skipping state in which monitoring of the PDCCH is skipped, and then switches to the state of monitoring the PDCCH.
  • a communication apparatus (100) that performs predetermined control for terminating the HARQ process performed before the PDCCH skipping state.
  • the communication unit (110) receives downlink control information (DCI) including a new data indicator (NDI) on the first detected PDCCH after switching to the PDCCH skipping state by monitoring the PDCCH, In the predetermined control, the control unit (120) regards the transmission scheduled by the DCI as an initial transmission regardless of the value of NDI included in the DCI received on the first detected PDCCH.
  • DCI downlink control information
  • NDI new data indicator
  • the control unit (120) manages a retransmission control buffer that holds the data, The communication device (100) according to appendix 1, wherein the control unit (120) flushes the retransmission control buffer in the predetermined control.
  • the communication unit (110) receives switching control information for controlling switching of the PDCCH monitoring state from the base station (200), 4.
  • the communication device (100) according to any one of additional notes 1 to 3, wherein the control unit (120) performs the predetermined control based on the switching control information.
  • PDCCH physical downlink control channel

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

Abstract

Un dispositif de communication (100) qui effectue une communication sans fil avec une station de base (200) comprend une unité de communication (110) qui communique des données avec la station de base (200), et une unité de commande (120) qui gère un processus de demande de répétition automatique hybride (HARQ) pour les données. L'unité de commande (120) commute un état de surveillance de PDCCH concernant la surveillance d'un canal de commande de liaison descendante physique (PDCCH) vers un état de saut de PDCCH pour sauter la surveillance du PDCCH, puis, sur la base d'une commutation vers un état pour surveiller le PDCCH, effectue une commande prédéterminée pour terminer le processus HARQ qui a été effectué avant l'état de saut de PDCCH.
PCT/JP2022/047089 2021-12-28 2022-12-21 Dispositif de communication et procédé de communication WO2023127636A1 (fr)

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Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
APPLE INC.: "Enhanced DCI-based power saving adaptation", 3GPP TSG RAN WG1 MEETING #105E, R1-2105118, 12 May 2021 (2021-05-12), XP052011206 *
HUAWEI, HISILICON: "Extensions to Rel-16 DCI-based power saving adaptation for an active BWP", 3GPP TSG RAN WG1 MEETING #106BIS-E R1-2108746, 2 October 2021 (2021-10-02), XP052057843 *

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