WO2023063262A1 - 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
WO2023063262A1
WO2023063262A1 PCT/JP2022/037662 JP2022037662W WO2023063262A1 WO 2023063262 A1 WO2023063262 A1 WO 2023063262A1 JP 2022037662 W JP2022037662 W JP 2022037662W WO 2023063262 A1 WO2023063262 A1 WO 2023063262A1
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Prior art keywords
paging
short message
information
control information
downlink control
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PCT/JP2022/037662
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English (en)
Japanese (ja)
Inventor
樹 長野
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 WO2023063262A1 publication Critical patent/WO2023063262A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/90—Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
    • 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
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • 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 communication devices, base stations, and communication methods used in mobile communication systems.
  • DCI downlink control information
  • DCI format 1_0 used for scheduling the physical downlink shared channel (PDSCH). It is transmitted from the base station to the communication device (see Non-Patent Document 1).
  • a DCI transmitted in DCI format 1_0 is used as a paging DCI appended with a cyclic redundancy check (CRC) scrambled by a paging radio network temporary identifier (P-RNTI) for system information changes and public warning systems.
  • CRC cyclic redundancy check
  • P-RNTI paging radio network temporary identifier
  • PWS may include short messages that are notifications. The communication device can grasp the short message by receiving the paging DCI.
  • Non-Patent Document 2 3GPP has been discussing reducing power consumption for communication devices in RRC idle state or RRC inactive state (see Non-Patent Document 2). Specifically, it is being considered to introduce a mechanism for classifying each of a plurality of communication devices assigned to the same paging opportunity into one of a plurality of subgroups (hereinafter referred to as paging subgroups).
  • the network Before sending a paging message, the network notifies each communication device of the paging subgroup to which the destination communication device of the paging message belongs.
  • a communication device in RRC idle state or RRC inactive state performs reception processing of the paging message (specifically, indicated by paging DCI and paging DCI) only when it determines that it belongs to the notified paging subgroup. received and decoded the paging message transmitted on the PDSCH), and determines whether the paging message contains its own unique identifier.
  • the communication device determines that it does not belong to the notified paging subgroup, the communication device can omit the paging message reception process at the paging opportunity, thereby reducing power consumption.
  • the communication device notifies, before the paging opportunity of the paging message, of the paging subgroup to which the communication device to which the paging message is sent belongs among the plurality of communication devices assigned to the same paging opportunity.
  • a receiving unit that receives from a base station downlink control information used for the above, and a control unit that determines whether or not the communication device belongs to the notified paging subgroup based on the downlink control information, Prepare.
  • the downlink control information includes the presence or absence of paging subgroup information for determining whether the communication device belongs to the paging subgroup, and the presence or absence of a short message that is a notification regarding system information changes and public warning systems. contains a short message indicator that indicates
  • a base station is a base station that performs wireless communication with a communication device.
  • the base station is a downlink used for notifying, before the paging opportunity of the paging message, the paging subgroup to which the communication device to which the paging message is sent belongs among the plurality of communication devices assigned to the same paging opportunity.
  • a control unit that generates control information, and a transmission unit that transmits the downlink control information to the communication device.
  • the downlink control information includes the presence or absence of paging subgroup information for determining whether the communication device belongs to the paging subgroup, and the presence or absence of a short message that is a notification regarding system information changes and public warning systems. contains a short message indicator that indicates
  • a communication method is a communication method executed by a communication device.
  • the communication method is a downlink used for notifying, before the paging opportunity of the paging message, a paging subgroup to which a communication device to which a paging message is sent belongs among a plurality of communication devices assigned to the same paging opportunity.
  • receiving control information from a base station and determining whether or not the communication device belongs to the notified paging subgroup based on the downlink control information.
  • the downlink control information includes the presence or absence of paging subgroup information for determining whether the communication device belongs to the paging subgroup, and the presence or absence of a short message that is a notification regarding system information changes and public warning systems. contains a short message indicator that indicates
  • FIG. 1 is a diagram showing the configuration of a mobile communication system according to an embodiment.
  • FIG. 2 is a diagram showing a configuration example of a protocol stack in the mobile communication system according to the embodiment.
  • FIG. 3 is a diagram illustrating paging subgrouping.
  • FIG. 4 is a diagram showing the configuration of the UE according to the embodiment.
  • FIG. 5 is a diagram showing the configuration of a base station according to the embodiment.
  • FIG. 6 is a sequence diagram for explaining a first operation example and a second operation example according to the embodiment.
  • one object of the present disclosure is to provide a communication device, a base station, and a communication method that enable reduction of power consumption by omitting paging message reception processing.
  • the mobile communication system 1 is, for example, a system conforming to 3GPP Technical Specifications (TS).
  • TS Technical Specifications
  • 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 is a communication device that communicates via base station 200 .
  • 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.
  • the UE 100 may be a transport body other than a vehicle (for example, a ship, an airplane, etc.) or a device provided thereon.
  • the UE 100 may be a sensor or a device attached thereto.
  • 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. For example, one cell belongs to one frequency (carrier frequency) and is configured by one component carrier.
  • the term “cell” may represent a radio communication resource and may also represent a communication target of UE 100 .
  • Each base station 200 can perform radio communication with the UE 100 residing in its own cell.
  • the base station 200 communicates with the UE 100 using the RAN protocol stack.
  • Base station 200 provides NR user plane and control plane protocol termination towards UE 100 and is connected to 5GC 30 via NG interface.
  • 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 radio section between the UE 100 and the base station 200 includes a physical (PHY) layer, a MAC (Medium Access Control) layer, an RLC (Radio Link Control) layer, a PDCP (Packet Data Convergence Protocol) layer, It has an RRC (Radio Resource Control) layer.
  • PHY physical
  • MAC Medium Access Control
  • RLC Radio Link Control
  • PDCP Packet Data Convergence Protocol
  • RRC Radio Resource Control
  • the PHY layer performs encoding/decoding, modulation/demodulation, antenna mapping/demapping, and resource mapping/demapping. Data and control information are transmitted between the PHY layer of the UE 100 and the PHY layer of the base station 200 via physical channels.
  • a physical channel is composed of multiple OFDM (Orthogonal Frequency Division Multiplexing) symbols in the time domain and multiple subcarriers in the frequency domain.
  • One subframe consists of a plurality of OFDM symbols in the time domain.
  • a resource block is a resource allocation unit, and is composed of a plurality of OFDM symbols and a plurality of subcarriers.
  • a frame may consist of 10 ms and may include 10 subframes of 1 ms.
  • a subframe can include a number of slots corresponding to the subcarrier spacing.
  • the physical downlink control channel plays a central role, for example, for purposes such as downlink scheduling assignments, uplink scheduling grants, and transmission power control.
  • the UE 100 can use a narrower bandwidth than the system bandwidth (that is, the cell bandwidth).
  • the base station 200 configures the UE 100 with a bandwidth part (BWP) made up of consecutive PRBs.
  • UE 100 transmits and receives data and control signals on the active BWP.
  • BWP bandwidth part
  • Up to four BWPs can be set in the UE 100, for example.
  • Each BWP may have different subcarrier spacing and may overlap each other in frequency. If multiple BWPs are configured for the UE 100, the base station 200 can specify which BWP to activate through downlink control. This allows the base station 200 to dynamically adjust the UE bandwidth according to the amount of data traffic of the UE 100, etc., and reduce UE power consumption.
  • the base station 200 can configure up to 3 control resource sets (CORESET) for each of up to 4 BWPs on the serving cell.
  • CORESET is a radio resource for control information that the UE 100 should receive.
  • UE 100 may be configured with up to 12 CORESETs on the serving cell.
  • Each CORESET has an index from 0 to 11.
  • a CORESET consists of 6 resource blocks (PRBs) and 1, 2 or 3 consecutive OFDM symbols in the time domain.
  • the MAC layer performs data priority control, retransmission processing by hybrid ARQ (HARQ: Hybrid Automatic Repeat reQuest), random access procedures, and the like. Data and control information are transmitted between the MAC layer of the UE 100 and the MAC layer of the base station 200 via transport channels.
  • the MAC layer of base station 200 includes a scheduler. The scheduler determines uplink and downlink transport formats (transport block size, modulation and coding scheme (MCS)) and allocation resources to the UE 100 .
  • 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 an IP flow, which is the unit of QoS (Quality of Service) control performed by the core network, and a radio bearer, which is the unit of AS (Access Stratum) QoS control.
  • the RRC layer controls logical channels, transport channels and physical channels according to radio bearer establishment, re-establishment and release.
  • RRC signaling for various settings is transmitted between the RRC layer of UE 100 and the RRC layer of base station 200 .
  • 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 paging message transmitted by the network 10 contains the identifier of each UE 100 that the network 10 calls.
  • a UE 100 in the RRC idle state or RRC inactive state intermittently monitors paging using discontinuous reception (DRX) in order to reduce power consumption.
  • a period for monitoring such paging is called a DRX cycle.
  • a frame that the UE 100 should monitor for paging is called a paging frame (PF), and a subframe within this PF that the UE 100 should monitor for paging is called a paging occasion (PO).
  • PF paging frame
  • PO a subframe within this PF that the UE 100 should monitor for paging
  • PO paging occasion
  • UE 100 may receive a paging message.
  • the UE 100 in the RRC idle state or RRC inactive state wakes up in PO, monitors paging messages, and performs paging message reception processing. Specifically, as a paging message reception process, first, the UE 100 receives and decodes the downlink control information (DCI) transmitted in the DCI format 1_0 used for scheduling the physical downlink shared channel (PDSCH). I do.
  • the DCI here is a DCI appended with a cyclic redundancy check (CRC) scrambled by a paging radio network temporary identifier (P-RNTI) (hereinafter referred to as paging DCI).
  • P-RNTI paging radio network temporary identifier
  • the UE 100 that has received the paging DCI receives and decodes the paging message transmitted on the PDSCH indicated by the paging DCI.
  • the UE 100 that has performed the paging message reception process determines whether the paging message includes its own unique identifier. When the paging message includes its own identifier, the UE 100 assumes that there is a call, and performs an operation of transitioning to the RRC connected state, for example.
  • all UEs 100 to which the same PO is assigned wake up at the PO to perform paging monitoring and paging message reception processing.
  • a group of UEs assigned the same PO is called a paging group.
  • the UE 100 that is not actually called by the network 10 also wakes up and performs paging message reception processing, resulting in extra power consumption.
  • each of the plurality of UEs 100 assigned to the same PO is classified (that is, grouped) into one of a plurality of subgroups (hereinafter referred to as paging subgroups (PSG)) that are units smaller than the paging group.
  • FIG. 3 shows an example of dividing a paging group into three paging subgroups with paging subgroup IDs "#1" to "#3". Although an example in which the number of UEs 100 belonging to each paging subgroup is three is shown, the number of UEs 100 belonging to each paging subgroup may be one or two, or four or more. good.
  • the network 10 Before transmitting the paging message, the network 10 (base station 200) notifies each UE 100 of the paging subgroup to which the UE 100 to which the paging message is transmitted belongs. For example, prior to the PO, the network 10 (base station 200) notifies each UE 100 of the paging subgroup identifier (paging subgroup ID) to which the UE 100 called in the paging message transmitted in the PO belongs (so-called paging early indication (PEI)).
  • PKI paging early indication
  • Each UE 100 in RRC idle state or RRC inactive state wakes up with the PO only when the paging subgroup ID to which it belongs is notified (that is, it belongs to the notified paging subgroup). Perform paging monitoring. As a result, the UEs 100 belonging to some of the paging subgroups do not have to wake up in the PO, thereby suppressing excessive power consumption.
  • short messages that are notifications regarding system information changes and public warning systems (PWS) are notified to UE 100 by paging DCI regardless of the presence or absence of paging messages. Therefore, even if the UE 100 determines that it does not belong to the paging subgroup notified prior to the PO, the UE 100 may need to receive the paging DCI to acquire the short message. Therefore, there is a concern that the paging message reception processing cannot be omitted, and the expected power consumption reduction effect cannot be obtained. In an embodiment described later, an operation for enabling reduction of power consumption by omitting paging message reception processing will be described.
  • UE 100 includes communication unit 110 and control unit 120 .
  • the communication unit 110 performs wireless communication with the base station 200 by transmitting and receiving wireless signals to and from the base station 200 .
  • the communication unit 110 has at least one transmitter 111 and at least one receiver 112 .
  • the transmitter 111 and receiver 112 may be configured to include multiple antennas and RF circuits.
  • the antenna converts a signal into radio waves and radiates the radio waves into space. Also, the antenna receives radio waves in space and converts the radio waves into signals.
  • the RF circuitry performs analog processing of signals transmitted and received through the antenna.
  • the RF circuitry may include high frequency filters, amplifiers, modulators, low pass filters, and the like.
  • the control unit 120 performs various controls in the UE 100.
  • Control unit 120 controls communication with base station 200 via communication unit 110 .
  • the operations of the UE 100 described above and below may be operations under the control of the control unit 120 .
  • the control unit 120 may include at least one processor capable of executing a program and a memory that stores the program.
  • the processor may execute a program to operate the control unit 120 .
  • the control unit 120 may include a digital signal processor that performs digital processing of signals transmitted and received through the antenna and RF circuitry.
  • the digital processing includes processing of the protocol stack of the RAN. Note that the memory stores programs executed by the processor, parameters related to the programs, and data related to the programs.
  • the memory may include at least one of ROM (Read Only Memory), EPROM (Erasable Programmable Read Only Memory), EEPROM (Electrically Erasable Programmable Read Only Memory), RAM (Random Access Memory), and flash memory. All or part of the memory may be included within the processor.
  • the receiving unit 112 notifies the paging subgroup to which the UE 100 to which the paging message is transmitted belongs among the plurality of UEs 100 assigned to the same paging opportunity before the paging opportunity of the paging message.
  • receive downlink control information from the base station 200.
  • the control unit 120 determines whether or not the UE 100 belongs to the notified paging subgroup based on the downlink control information.
  • the downlink control information is a short message indicating the presence or absence of paging subgroup information for determining whether or not the UE 100 belongs to the paging subgroup, and the presence or absence of a short message that is a notification regarding system information changes and public warning systems. Including indicators.
  • the UE 100 can grasp the presence or absence of the paging subgroup information and the presence or absence of the short message from the short message indicator. For example, when there is no paging subgroup information and no short message, the UE 100 can omit paging message reception processing, and can reduce power consumption by omitting paging message reception processing.
  • Base station configuration A configuration of the base station 200 according to the embodiment will be described with reference to FIG.
  • Base station 200 has communication unit 210 , network interface 220 , and control unit 230 .
  • the communication unit 210 receives radio signals from the UE 100 and transmits radio signals to the UE 100.
  • the communication unit 210 has at least one transmitter 211 and at least one receiver 212 .
  • the transmitting section 211 and the receiving section 212 may be configured including an RF circuit.
  • the RF circuitry performs analog processing of signals transmitted and received through the antenna.
  • the RF circuitry may include high frequency filters, amplifiers, modulators, low pass filters, and the like.
  • the network interface 220 transmits and receives signals to and from the network.
  • the network interface 220 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 configured in this manner performs wireless communication with the UE 100.
  • Control section 230 provides downlink control information used for notifying, before the paging opportunity of the paging message, the paging subgroup to which the UE 100 to which the paging message is sent belongs among the plurality of UEs 100 assigned to the same paging opportunity. Generate.
  • the transmitting section 211 transmits downlink control information to the UE 100 .
  • the downlink control information is a short message indicating the presence or absence of paging subgroup information for determining whether or not the UE 100 belongs to the paging subgroup, and the presence or absence of a short message that is a notification regarding system information changes and public warning systems. Including indicators.
  • the UE 100 can grasp the presence or absence of the paging subgroup information and the presence or absence of the short message from the short message indicator. For example, when there is no paging subgroup information and no short message, the UE 100 can omit paging message reception processing, and can reduce power consumption by omitting paging message reception processing.
  • UE 100 is in RRC idle state or RRC inactive state.
  • UE 100 is located in a cell managed by base station 200 .
  • the cell may be a cell selected by the UE 100 by cell (re)selection, and may be referred to as a camp-on cell.
  • step S101 the base station 200 (control unit 230) selects the paging subgroup to which the UE 100 to which the paging message is sent belongs among the plurality of UEs 100 assigned to the same PO.
  • a DCI hereinafter referred to as PEI as appropriate
  • PEI used for notification before PO is generated.
  • the base station 200 (control unit 230) can generate a PEI when a paging trigger event occurs.
  • Paging trigger event for example, when an instruction to call UE 100 is received from 5GC 30, when (part of) system information is changed or updated, at least one of when a warning message is broadcast It may be .
  • the warning message is a message regarding the Public Warning System (PWS).
  • Public warning systems include earthquake and tsunami warning systems (ETWS) and commercial mobile alert systems (CMAS).
  • ETWS is a system developed to meet regulatory requirements for warning notifications related to earthquake and/or tsunami events.
  • ETWS alert notifications can be either ETWS primary notifications, which are short notifications, or ETWS secondary notifications, which provide more information.
  • ETWS Primary Notifications are broadcast in System Information Block Type 6 (SIB6).
  • ETWS Secondary Notifications are broadcast in System Information Block Type 7 (SIB7).
  • CMAS is a public alert system developed for delivery of multiple simultaneous alert notifications.
  • CMAS alert notifications (CMAS notifications) are broadcast in system information block type 8 (SIB8).
  • the PEI may be DCI transmitted by the PDCCH in a new non-scheduling DCI format different from the existing DCI format.
  • non-scheduling DCI formats are DCI formats 2_0 to 2_6.
  • the PEI includes a bit field in which a short message is stored (hereinafter referred to as an SM bit field), a bit field in which paging subgroup information is stored (hereinafter referred to as a PSG bit field), a bit field in which a short message indicator is stored (hereinafter referred to as an SMI bit field).
  • an SM bit field a bit field in which a short message is stored
  • PSG bit field paging subgroup information is stored
  • SMI bit field bit field in which a short message indicator is stored
  • the base station 200 can include in the DCI short messages that are notifications regarding system information changes and public warning systems.
  • the base station 200 may include the short message in the DCI, for example, when (part of) the system information is changed and/or when a warning message is broadcast.
  • the base station 200 may store the short message in the SM bit field of DCI.
  • a short message may indicate, for example, that a broadcast control channel (BCCH) other than SIB6, SIB7, and SIB8 has been changed (or updated).
  • the short message may also indicate, for example, that any of the ETWS Primary Notification, ETWS Secondary Notification and CMAS Notification are being broadcast. Note that the short message may indicate other information.
  • the base station 200 can include paging subgroup information for determining whether or not the UE 100 belongs to the paging subgroup in the DCI.
  • Base station 200 (control unit 230) performs paging including a paging subgroup identifier to which called UE 100 belongs among a plurality of UEs 100 assigned to the same PO as called UE 100, for example, in response to a paging instruction of UE 100.
  • Subgroup information may be included in the DCI.
  • Base station 200 (control unit 230) may store paging subgroup information in the PSG bit field of DCI.
  • the paging subgroup information may indicate multiple paging subgroups paged by one PO so that no paging delay occurs. Also, the paging subgroup information may indicate multiple paging subgroups to be paged for each PO in one paging frame (PF).
  • the paging subgroup information may be, for example, a bitmap indicating paging subgroups to be paged for each PO within one PF. The bitmap length may be defined, for example, by the number of paging subgroups (Nsg) times the number of POs in one PF (Ns).
  • the base station 200 (control unit 230) includes in the DCI (PEI) a short message indicator indicating the presence or absence of paging subgroup information and the presence or absence of a short message.
  • Base station 200 (control section 230) may store a short message indicator in the SMI bit field of DCI.
  • the base station 200 (control unit 230) may determine the value of the short message indicator included in the DCI according to the information included in the DCI. Table 1 shows examples of values to be included as short message indicators and the contents of those values.
  • the short message indicator has a first value (in Table 1, "01"), a second value (“10” in Table 1) indicating that only the short message is present in the downlink control information (PEI) among the paging subgroup information and the short message, and the paging subgroup information and a third value (“11” in Table 1) indicating that both the short message and the short message are present in the downlink control information (PEI).
  • the short message indicator may be a fourth value (“00” in Table 1) indicating that it is a reserved bit field.
  • reserved bit-fields can be treated as reserved bit-fields for future functional expansion.
  • Base station 200 (control unit 230) stores the first value (“01” in the example of Table 1) in the SMI bit field when paging subgroup information is included in DCI (PEI) without including a short message. you can Base station 200 (control unit 230) stores the second value (“10” in the example of Table 1) in the SMI bit field when paging subgroup information is included in DCI (PEI) without including a short message. you can Base station 200 (control unit 230) may store a third value ("11" in the example of Table 1) in the SMI bit field when including a short message and paging subgroup information in DCI (PEI). . Note that base station 200 (control unit 230) may store the fourth value (“00” in the example of Table 1) in the SMI bit field under predetermined conditions when the function is expanded in the future.
  • the base station 200 (control unit 230) adds a CRC scrambled with a predetermined radio network temporary identifier (RNTI) to the DCI.
  • RNTI radio network temporary identifier
  • Such DCI may be referred to as PEI.
  • base station 200 (control section 230) generates PEI.
  • the predetermined RNTI may be an existing RNTI (for example, P-RNTI) or a new RNTI.
  • a new RNTI may be defined by, for example, a single value and need not be set by a higher layer.
  • the base station 200 may transmit setting information for setting a common search space for monitoring PEI to the UE 100 before the process of step S102.
  • the setting of the common search space for monitoring PEI may be different from the setting of the search space for paging, or the setting of the existing search space for paging may be used.
  • the PEI opportunity which is the opportunity to monitor the PEI, is set before the PO. There may be a time offset between the PEI opportunity and the start of the PF containing the PO for which the UE 100 belonging to the paging subgroup signaled by the PEI on that PEI opportunity receives the paging message.
  • the base station 200 transmits the generated PEI to the UE 100 at the PEI opportunity.
  • UE 100 receives PEI from base station 200 at the PEI opportunity.
  • step S103 the UE 100 (control unit 120) makes the following determinations.
  • UE 100 (control unit 120) determines whether or not paging subgroup information exists based on the short message indicator. Also, UE 100 (control unit 120) determines whether or not there is a short message based on the short message indicator.
  • the UE 100 may determine that only the paging subgroup information exists in the PEI among the paging subgroup information and the short message. Also, when the short message indicator is the first value, UE 100 (control unit 120) may regard the SM bit field as a spare bit field. In this case, the UE 100 (control unit 120) may ignore the information in the SM bitfield.
  • the UE 100 may determine that only the short message exists in the PEI among the paging subgroup information and the short message. Also, when the short message indicator is the second value, UE 100 (control unit 120) may regard the PSG bit field as a spare bit field. In this case, the UE 100 (control unit 120) may ignore the information in the PSG bitfield.
  • control unit 120 may determine that both the paging subgroup information and the short message are present in the PEI when the short message indicator is the third value.
  • the UE 100 determines whether it belongs to the paging subgroup notified by the paging subgroup information. For example, when the paging subgroup identifier to which the UE 100 belongs is included in the paging subgroup information, the UE 100 (control unit 120) may determine that the UE 100 belongs to the notified paging subgroup. On the other hand, UE 100 (control unit 120) may determine that UE 100 (control unit 120) does not belong to the notified paging subgroup if, for example, the paging subgroup identifier assigned to itself is not included in the paging subgroup information. .
  • the UE 100 executes the process of step S104. That is, the UE 100 (control unit 230) wakes up at the PO and performs paging monitoring and paging message reception processing.
  • the UE 100 may calculate the paging subgroup identifier to which it belongs or may be assigned by the network 10.
  • the UE 100 determines that the short message exists in the PEI, it executes processing based on the short message.
  • UE 100 determines that the short message exists in the PEI, it executes processing based on the short message.
  • UE 100 for example, when the short message indicates that (part of) the system information has been changed (or updated), performs the reception process of the system information block other than SIB6, SIB7 and SIB8 you can For example, when the short message indicates that any one of the ETWS primary notification, the ETWS secondary notification, and the CMAS notification is broadcast, the UE 100 (control unit 120) performs reception processing for at least one of SIB6, SIB7, and SIB8. Execute.
  • the UE 100 executes the process of step S104 when the short message indicator is either the first value or the third value.
  • the UE 100 may omit the process of step S104 when the short message indicator is not the first value and the third value.
  • step S104 the base station 200 (transmitting unit 211) transmits the paging DCI to the UE 100 in PO.
  • UE 100 receives the paging DCI from base station 200 .
  • UE 100 may ignore the short message indicator information included in the paging DCI. That is, UE 100 (receiving unit 112) that has received the short message indicator included in the PEI in step S102 does not need to receive the short message indicator included in the paging DCI.
  • the paging DCI includes scheduling information for paging messages transmitted on the PDSCH.
  • the paging DCI is a DCI appended with a cyclic redundancy check (CRC) scrambled by a paging radio network temporary identifier (P-RNTI).
  • CRC cyclic redundancy check
  • P-RNTI paging radio network temporary identifier
  • step S105 the base station 200 (transmitting unit 211) transmits the paging message to the UE100.
  • UE 100 (receiving unit 112 ) receives the paging message from base station 200 .
  • the UE 100 determines whether the paging message contains its own unique identifier. When the paging message includes its own identifier, the UE 100 assumes that there is a call, and performs an operation of transitioning to the RRC connected state, for example.
  • the UE 100 receives from the base station 200 the DCI (PEI) used to notify the paging subgroup before the PO of the paging message.
  • the UE 100 determines whether or not the UE 100 belongs to the notified paging subgroup based on the PEI.
  • the PEI includes short message indicators that indicate the presence or absence of paging subgroup information and the presence or absence of short messages. Thereby, the UE 100 can grasp the presence or absence of the paging subgroup information and the presence or absence of the short message from the short message indicator. For example, when there is no paging subgroup information and no short message, the UE 100 can omit paging message reception processing, and can reduce power consumption by omitting paging message reception processing.
  • the short message indicator has a first value indicating that only the paging subgroup information of the paging subgroup information and the short message exists in the PEI, and only the short message of the paging subgroup information and the short message. It may be either a second value indicating that it is present in the PEI, or a third value indicating that both the paging subgroup information and the short message are present in the PEI.
  • the UE 100 can omit the paging message reception process when the PEI does not have the paging subgroup information, and can reduce power consumption by omitting the paging message reception process.
  • the UE 100 can, for example, omit the reception processing of the system information block, and can reduce power consumption by omitting the reception processing.
  • the UE 100 may regard the SM bit field as a spare bit field. As a result, the UE 100 (control unit 120) can omit processing of information in the SM bit field, and power consumption can be reduced.
  • the UE 100 may regard the PSG bit field as a spare bit field. As a result, the UE 100 (control unit 120) can omit processing of information in the PSG bit field, and power consumption can be reduced.
  • the PEI is configured not to contain a bitfield (SM bitfield) in which the short message is stored. Therefore, the PEI includes a PSG bit field in which the paging subgroup information is stored, an SMI indicator in which the short message indicator is stored, and does not include an SM bit field in which the short message is stored.
  • SM bitfield bitfield
  • the base station 200 may use, for example, the values in Table 2 as the value of the short message indicator to be included in the DCI according to the information included in the DCI.
  • Table 2 shows examples of values to be included as short message indicators and the contents of those values.
  • the short message indicator indicates that the paging subgroup information is present in the downlink control information (PEI) and the short message is present in the paging downlink control information (paging DCI) following the downlink control information.
  • a first value (“01” in Table 1) indicating that no paging subgroup information is present in the downlink control information (PEI) and the paging downlink control in which the short message follows the downlink control information a second value indicating that it is present in the information (paging DCI) and that the paging subgroup information is present in the downlink control information (PEI) and the short message is present in the paging downlink control information (paging DCI); and a third value indicating .
  • the short message indicator may be a fourth value (“00” in Table 1) indicating that it is a reserved bit field.
  • Base station 200 (control unit 230) stores the first value (“01” in the example of Table 1) in the SMI bit field when the paging subgroup information is included in PEI and the short message is not included in paging DCI. You can When the paging subgroup information is not included in the PEI and the short message is included in the paging DCI, the base station 200 (control unit 230) stores the second value (“10” in the example of Table 1) in the SMI bit field. You can When the paging subgroup information is included in the PEI and the short message is included in the paging DCI, the base station 200 (control unit 230) stores the third value (“10” in the example of Table 1) in the SMI bit field. You can Note that base station 200 (control unit 230) may store the fourth value (“00” in the example of Table 1) in the SMI bit field under predetermined conditions when the function is expanded in the future.
  • the base station 200 transmits the generated PEI to the UE 100 at the PEI opportunity.
  • UE 100 receives PEI from base station 200 at the PEI opportunity.
  • step S103 the UE 100 (control unit 120) makes the following determinations.
  • UE 100 (control unit 120) determines whether paging subgroup information exists in PEI based on the short message indicator. Also, the UE 100 (control unit 120) determines whether or not there is a short message in the paging DCI that follows the PEI, based on the short message indicator.
  • the UE 100 may include the paging subgroup information in the PEI and determine that there is no short message in the paging DCI.
  • the UE 100 may determine that the paging subgroup information does not exist in the PEI and the short message exists in the paging DCI. Also, when the short message indicator is the second value, UE 100 (control unit 120) may regard the PSG bit field as a spare bit field. In this case, the UE 100 (control unit 120) may ignore the information in the PSG bitfield.
  • the UE 100 may determine that the paging subgroup information exists in the PEI and the short message exists in the paging DCI.
  • the UE 100 when determining that the paging subgroup information exists in the PEI, the UE 100 (control unit 120) determines whether the UE 100 belongs to the paging subgroup notified by the paging subgroup information. .
  • the UE 100 determines that the short message exists in the paging DCI, it executes the process of step S104.
  • the UE 100 executes the process of step S104 when the short message indicator is any one of the first value, the second value, and the third value.
  • the UE 100 may omit the process of step S104 when the short message indicator is neither the first value, the second value, nor the third value.
  • step S104 the base station 200 (transmitting unit 211) transmits the paging DCI to the UE 100 in PO.
  • UE 100 receives the paging DCI from base station 200 .
  • UE 100 may ignore the short message indicator information included in the paging DCI. That is, UE 100 (receiving unit 112) that has received the short message indicator included in the PEI in step S102 does not need to receive the short message indicator included in the paging DCI.
  • step S103 determines in step S103 that a short message exists in the paging DCI
  • UE 100 (control unit 120) when the short message indicator is the second value, that is, when it is determined that paging subgroup information does not exist in PEI and short message exists in paging DCI, the process of step S105 is performed. May be omitted.
  • the short message indicator has a first value indicating that the paging subgroup information is present in the PEI and the short message is not present in the paging DCI, the paging subgroup information is not present in the PEI, and any of a second value indicating that the short message is present in the paging DCI and a third value indicating that the paging subgroup information is present in the PEI and the short message is present in the paging DCI. can be a value. If the paging subgroup information does not exist in the PEI and the short message does not exist in the paging DCI, the UE 100 can omit the paging message reception processing, and can reduce power consumption by omitting the paging message reception processing. .
  • the UE 100 may regard the bit field indicating the short message in the paging DCI as a spare bit field. As a result, the UE 100 (control unit 120) can omit processing of information in the SM bit field in the paging DCI, and power consumption can be reduced.
  • the UE 100 may regard the PSG bit field as a spare bit field. As a result, the UE 100 (control unit 120) can omit processing of information in the PSG bit field, and power consumption can be reduced.
  • 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 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.
  • the base station 200 may be an IAB (Integrated Access and Backhaul) donor or an IAB node.
  • IAB Integrated Access and Backhaul
  • 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.
  • a receiver (112) that receives link control information from a base station (200); a control unit (120) that determines whether the communication device (100) belongs to the notified paging subgroup based on the downlink control information;
  • the downlink control information includes the presence or absence of paging subgroup information for determining whether the communication device (100) belongs to the paging subgroup, and a short message that is a notification regarding system information changes and a public warning system.
  • a communication device (100) including a short message indicator indicating the presence or absence of a
  • the short message indicator is a first value indicating that only the paging subgroup information among the paging subgroup information and the short message is present in the downlink control information; a second value indicating that only the short message among the paging subgroup information and the short message is present in the downlink control information; and a third value indicating that both the paging subgroup information and the short message are present in the downlink control information.
  • the downlink control information includes a bit field indicating the short message, The communication device (100) according to appendix 2, wherein the control unit (120) considers the bit field indicating the short message to be a spare bit field when the short message indicator is the first value.
  • the downlink control information includes a bit field indicating the paging subgroup information, The communication device according to appendix 2 or 3, wherein the control unit (120) considers the bit field indicating the paging subgroup information to be a spare bit field when the short message indicator is the second value. (100).
  • the short message indicator is a first value indicating that the paging subgroup information is present in the downlink control information and the short message is not present in paging downlink control information subsequent to the downlink control information; a second value indicating that the paging subgroup information is not present in the downlink control information and the short message is present in paging downlink control information subsequent to the downlink control information; and a third value indicating that the paging subgroup information is present in the downlink control information and the short message is present in the paging downlink control information.
  • communication device 100).
  • the control unit (120) determines that the bit field indicating the short message in the paging downlink control information is a spare bit field when the short message indicator is the first value.
  • the downlink control information includes a bit field indicating the paging subgroup information, The communication device according to appendix 5 or 6, wherein the control unit (120) considers the bit field indicating the paging subgroup information to be a spare bit field when the short message indicator is the second value. (100).
  • a base station (200) that performs wireless communication with a communication device (100), Downstream used for notifying, before the paging opportunity of the paging message, the paging subgroup to which the communication device (100) of the transmission destination of the paging message belongs among the plurality of communication devices (100) assigned to the same paging opportunity.
  • a control unit (230) that generates link control information;
  • a transmission unit (211) that transmits the downlink control information to the communication device (100),
  • the downlink control information includes the presence or absence of paging subgroup information for determining whether the communication device (100) belongs to the paging subgroup, and a short message that is a notification regarding system information changes and a public warning system. base station (200).
  • the downlink control information includes the presence or absence of paging subgroup information for determining whether the communication device (100) belongs to the paging subgroup, and a short message that is a notification regarding system information changes and a public warning system. including a short message indicator indicating the presence or absence of a communication method.

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Abstract

Un dispositif de communication (100) comprend : une unité de réception (112) destinée à recevoir, en provenance d'une station de base (200), des informations de commande de liaison descendante à utiliser pour notifier, avant une opportunité de radiomessagerie d'un message de radiomessagerie, un sous-groupe de radiomessagerie auquel un dispositif de communication (100) d'une destination de transmission du message de radiomessagerie appartient parmi une pluralité de dispositifs de communication (100) affectés à la même occasion de radiomessagerie ; et une unité de commande (120) destinée à déterminer, en fonction des informations de commande de liaison descendante, si le dispositif de communication (100) appartient ou non au sous-groupe de radiomessagerie notifié. Les informations de commande de liaison descendante comprennent un indicateur de message court indiquant : la présence ou l'absence d'informations de sous-groupe de radiomessagerie pour déterminer si le dispositif de communication (100) appartient ou non au sous-groupe de radiomessagerie ; et la présence ou l'absence d'un message court qui est une notification concernant un changement d'informations système et un système d'avertissement public.
PCT/JP2022/037662 2021-10-11 2022-10-07 Dispositif de communication, station de base et procédé de communication WO2023063262A1 (fr)

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Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
CATT: "Paging enhancement for UE power saving", 3GPP DRAFT; R1-2109235, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20211011 - 20211019, 1 October 2021 (2021-10-01), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052058192 *
DENSO CORPORATION: "Design of PDCCH-based Paging Early Indication", 3GPP DRAFT; R1-2110315, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20211011 - 20211019, 1 October 2021 (2021-10-01), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052059248 *
LG ELECTRONICS: "Discussion on potential paging enhancements", 3GPP DRAFT; R1-2109980, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20211011 - 20211019, 2 October 2021 (2021-10-02), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052058916 *
NOKIA, NOKIA SHANGHAI BELL: "On paging enhancements for UE power saving", 3GPP DRAFT; R1-2110311, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20211011 - 20211019, 1 October 2021 (2021-10-01), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052059244 *
XIAOMI: "Paging enhancements for power saving", 3GPP DRAFT; R1-2109422, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20211011 - 20211019, 30 September 2021 (2021-09-30), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052058370 *

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