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WO2018174635A1 - Procédé et dispositif sans fil pour recevoir un message de radiomessagerie - Google Patents

Procédé et dispositif sans fil pour recevoir un message de radiomessagerie Download PDF

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Publication number
WO2018174635A1
WO2018174635A1 PCT/KR2018/003435 KR2018003435W WO2018174635A1 WO 2018174635 A1 WO2018174635 A1 WO 2018174635A1 KR 2018003435 W KR2018003435 W KR 2018003435W WO 2018174635 A1 WO2018174635 A1 WO 2018174635A1
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WO
WIPO (PCT)
Prior art keywords
wus
wuso
wireless device
paging
window
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2018/003435
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English (en)
Korean (ko)
Inventor
황승계
박창환
안준기
박한준
양석철
윤석현
신석민
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020180033509A external-priority patent/KR20180121350A/ko
Priority to CN201880004110.1A priority Critical patent/CN109923914B/zh
Priority to CN202111175968.4A priority patent/CN113891437B/zh
Priority to CN202110984002.9A priority patent/CN113873621B/zh
Priority to EP21206576.7A priority patent/EP3968709B1/fr
Priority to EP18771456.3A priority patent/EP3509368A4/fr
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Priority to JP2019528879A priority patent/JP6882475B2/ja
Publication of WO2018174635A1 publication Critical patent/WO2018174635A1/fr
Priority to US16/379,288 priority patent/US10904861B2/en
Anticipated expiration legal-status Critical
Priority to US17/129,301 priority patent/US11818685B2/en
Priority to US18/377,489 priority patent/US12120639B2/en
Priority to US18/882,393 priority patent/US20250008487A1/en
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is leader and terminal is follower
    • H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is leader and terminal is follower using a pre-established activity schedule, e.g. traffic indication frame
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H04W52/0229—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal
    • H04W52/0235—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal where the received signal is a power saving command
    • 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
    • H04W68/02—Arrangements for increasing efficiency of notification or paging channel
    • 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 invention relates to mobile communications.
  • the base station When there is downlink data to be transmitted to a terminal in which the base station is in a radio resource control (RRC) idle state, the base station transmits a paging message to switch the terminal to the RRC connected mode.
  • RRC radio resource control
  • a downlink control channel for example, a physical downlink control channel (PDCCH).
  • a monitoring period is short, the period in which the terminal performs blind decoding (BD) is shortened, resulting in an increase in power consumption.
  • BD blind decoding
  • a downlink channel or an uplink channel may be repeatedly transmitted on several subframes.
  • the present disclosure aims to solve the above-mentioned problem.
  • one disclosure of the present specification provides a method for a wireless device to receive a paging message.
  • the method includes determining a wake up signal occasion (WUSO) window to attempt to receive a wake up signal (WUS); Monitoring the downlink control channel during the paging window to attempt to receive the paging message when the WUS is received within the determined WUSO window.
  • WUSO window may be determined by the size and offset of the interval.
  • a plurality of paging windows and / or paging occasions (POs) may be indicated by the WUS.
  • the PO may indicate a subframe in which transmission of the paging message starts in the paging window.
  • the time interval in which the WUS exists in the determined WUSO window may be defined as WUSO.
  • the offset may indicate a difference from the PO to a start point or end point of the WUSO window.
  • the WUSO may be postpone to a subsequent valid subframe.
  • the frequency resource region in which the WUSO window exists may be the same as the frequency resource region in which the PO exists.
  • the WUS's attempt to receive may be abandoned. As such, when the WUS reception attempt is abandoned, the reception of the paging message may be monitored during the PO corresponding to the WUSO.
  • the WUS may include an identifier of a wireless device or a group identifier of wireless devices that should receive the paging message.
  • the paging window may start after a certain gap from the start point of the WUSO window.
  • the block used by the WUS may be defined as a wake up signal block (WUSB).
  • WUSB wake up signal block
  • the repetition size of the WUSB may be determined based on an upper layer parameter set for the WUS and an upper layer parameter set for the paging message.
  • the WUS may be generated based on any one of a plurality of sequences.
  • An identifier of a wireless device or a group identifier of wireless devices may be used to generate the sequence.
  • At least one of the plurality of sequences may be used to wake or sleep all wireless devices.
  • the wireless device includes a transceiver; And it may include a processor for controlling the transceiver.
  • the processor may determine a wake up signal occasion (WUSO) window to attempt to receive a wake up signal (WUS).
  • WUS wake up signal occasion
  • the processor may control the transceiver to monitor the downlink control channel during the paging window.
  • the WUSO window may be determined by the size and offset of the interval.
  • 1 is a wireless communication system.
  • FIG. 2 shows a structure of a radio frame according to FDD in 3GPP LTE.
  • 3 shows a structure of a downlink subframe.
  • FIG 5A illustrates an example of Internet of Things (IoT) communication.
  • IoT Internet of Things
  • 5B is an illustration of cell coverage extension or augmentation for IoT devices.
  • 5C is an exemplary diagram illustrating an example of transmitting a bundle of downlink channels.
  • 6A and 6B are exemplary views illustrating examples of subbands in which an IoT device operates.
  • FIG. 7 shows an example of a time resource that can be used for NB-IoT in M-frame units.
  • FIG. 8 is another exemplary diagram illustrating time resources and frequency resources that can be used for NB IoT.
  • 9 is an exemplary view illustrating a paging procedure.
  • FIG. 10A is a flowchart illustrating an example of utilizing WUS introduced according to the disclosure of the present specification
  • FIG. 10B is an exemplary diagram illustrating WUS in the time domain.
  • 11 is an exemplary view showing a WUSO window on a time axis.
  • 12A is an exemplary diagram illustrating a first scheme of the second disclosure.
  • FIG. 13 is an exemplary view illustrating a second scheme of the second disclosure.
  • FIG 14 is an exemplary view showing a first example of the third scheme of the second disclosure.
  • 15 is an exemplary diagram illustrating a second example of the third scheme of the second disclosure.
  • 16 is an exemplary view showing a third example of the third scheme of the second disclosure.
  • 17 is an exemplary view showing a solution according to the fourth disclosure.
  • 19 is a block diagram illustrating a wireless device and a base station in which the present disclosure is implemented.
  • FIG. 20 is a detailed block diagram of a transceiver of the wireless device shown in FIG. 19.
  • LTE includes LTE and / or LTE-A.
  • first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
  • first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.
  • base station which is used hereinafter, generally refers to a fixed station for communicating with a wireless device, and includes an evolved-nodeb (eNodeB), an evolved-nodeb (eNB), a base transceiver system (BTS), and an access point (e.g., a fixed station). Access Point) may be called.
  • eNodeB evolved-nodeb
  • eNB evolved-nodeb
  • BTS base transceiver system
  • access point e.g., a fixed station.
  • NB IoT device User Equipment
  • UE User Equipment
  • UT User Equipment
  • terminal subscriber station
  • MT mobile terminal
  • 1 is a wireless communication system.
  • a wireless communication system includes at least one base station (BS) 20.
  • Each base station 20 provides a communication service for a particular geographic area (generally called a cell) 20a, 20b, 20c.
  • the cell can in turn be divided into a number of regions (called sectors).
  • the NB IoT device typically belongs to one cell, and the cell to which the NB IoT device belongs is called a serving cell.
  • a base station that provides a communication service for a serving cell is called a serving BS. Since the wireless communication system is a cellular system, there are other cells adjacent to the serving cell. Another cell adjacent to the serving cell is called a neighbor cell.
  • a base station that provides communication service for a neighbor cell is called a neighbor BS.
  • the serving cell and the neighbor cell are determined relatively based on the NB IoT device.
  • downlink means communication from the base station 20 to the NB IoT device 10
  • uplink means communication from the NB IoT device 10 to the base station 20.
  • the transmitter may be part of the base station 20 and the receiver may be part of the NB IoT device 10.
  • the transmitter may be part of the NB IoT device 10 and the receiver may be part of the base station 20.
  • a wireless communication system can be largely divided into a frequency division duplex (FDD) method and a time division duplex (TDD) method.
  • FDD frequency division duplex
  • TDD time division duplex
  • uplink transmission and downlink transmission are performed while occupying different frequency bands.
  • uplink transmission and downlink transmission are performed at different times while occupying the same frequency band.
  • the channel response of the TDD scheme is substantially reciprocal. This means that the downlink channel response and the uplink channel response are almost the same in a given frequency domain. Therefore, in a TDD based wireless communication system, the downlink channel response can be obtained from the uplink channel response.
  • the downlink transmission by the base station and the uplink transmission by the NB IoT device cannot be simultaneously performed.
  • uplink transmission and downlink transmission are performed in different subframes.
  • FIG. 2 shows a structure of a radio frame according to FDD in 3GPP LTE.
  • a radio frame includes 10 subframes (subframes), and one subframe includes two slots. Slots in a radio frame are numbered from 0 to 19 slots.
  • the time taken for one subframe to be transmitted is called a transmission time interval (TTI).
  • TTI may be referred to as a scheduling unit for data transmission.
  • one radio frame may have a length of 10 ms
  • one subframe may have a length of 1 ms
  • one slot may have a length of 0.5 ms.
  • the structure of the radio frame is merely an example, and the number of subframes included in the radio frame or the number of slots included in the subframe may be variously changed.
  • one slot may include a plurality of orthogonal frequency division multiplexing (OFDM) symbols. How many OFDM symbols are included in one slot may vary depending on a cyclic prefix (CP).
  • OFDM orthogonal frequency division multiplexing
  • One slot includes N RB resource blocks (RBs) in the frequency domain.
  • N RB resource blocks For example, in the LTE system, the number of resource blocks (RBs), that is, N RBs may be any one of 6 to 110.
  • a resource block is a resource allocation unit and includes a plurality of subcarriers in one slot. For example, if one slot includes 7 OFDM symbols in the time domain and the resource block includes 12 subcarriers in the frequency domain, one resource block may include 7 ⁇ 12 resource elements (REs). Can be.
  • REs resource elements
  • physical channels include a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), a physical downlink control channel (PDCCH), a physical control format indicator channel (PCFICH), and a physical hybrid (PHICH).
  • PDSCH physical downlink shared channel
  • PUSCH physical uplink shared channel
  • PDCCH physical downlink control channel
  • PCFICH physical control format indicator channel
  • PHICH physical hybrid
  • ARQ Indicator Channel Physical Uplink Control Channel
  • the uplink channel includes a PUSCH, a PUCCH, a sounding reference signal (SRS), and a physical random access channel (PRACH).
  • PUSCH PUSCH
  • PUCCH Physical Uplink Control Channel
  • SRS sounding reference signal
  • PRACH physical random access channel
  • 3 shows a structure of a downlink subframe.
  • the DL (downlink) subframe is divided into a control region and a data region in the time domain.
  • the control region includes up to three OFDM symbols preceding the first slot in the subframe, but the number of OFDM symbols included in the control region may be changed.
  • a physical downlink control channel (PDCCH) and another control channel are allocated to the control region, and a PDSCH is allocated to the data region.
  • PDCH physical downlink control channel
  • the PCFICH transmitted in the first OFDM symbol of a subframe carries a control format indicator (CFI) regarding the number of OFDM symbols (that is, the size of a control region) used for transmission of control channels in the subframe.
  • CFI control format indicator
  • the wireless device first receives the CFI on the PCFICH and then monitors the PDCCH.
  • DCI downlink control information
  • DCI can be used for resource allocation of PDSCH (also called DL grant), PUSCH resource allocation (also known as UL uplink grant), and transmit power for individual NB IoT devices in any NB IoT device group.
  • VoIP Voice over Internet Protocol
  • the base station determines the PDCCH format according to the DCI to be sent to the NB IoT device, and attaches a cyclic redundancy check (CRC) to the control information.
  • CRC cyclic redundancy check
  • the CRC masks a unique radio network temporary identifier (RNTI) according to the owner or purpose of the PDCCH. If the PDCCH for a specific NB IoT device, a unique identifier of the NB IoT device, for example, a cell-RNTI (C-RNTI) may be masked to the CRC. Alternatively, if the PDCCH is for a paging message, a paging indication identifier, for example, p-RNTI (P-RNTI), may be masked to the CRC.
  • RNTI radio network temporary identifier
  • a system information identifier and a system information-RNTI may be masked to the CRC.
  • a random access-RNTI may be masked in the CRC to indicate a random access response that is a response to the transmission of the random access preamble of the NB IoT device.
  • blind decoding is used to detect the PDCCH.
  • Blind decoding is a method of demasking a desired identifier in a cyclic redundancy check (CRC) of a received PDCCH (referred to as a candidate PDCCH) and checking a CRC error to determine whether the corresponding PDCCH is its control channel.
  • the base station determines the PDCCH format according to the DCI to be sent to the wireless device, attaches the CRC to the DCI, and masks a unique identifier (RNTI) to the CRC according to the owner or purpose of the PDCCH.
  • RNTI unique identifier
  • DRX Discontinuous Reception
  • DRX is a technique for reducing the battery consumption of the wireless device by allowing the terminal to monitor the downlink channel discontinuously.
  • the DRX cycle specifies the periodic repetition of On-Duration followed by a possible interval of inactivity.
  • the DRX cycle includes on- and off-sections.
  • On-section is a device that the UE monitors the PDCCH in the DRX cycle.
  • the UE may monitor the PDCCH only in the on-section and may not monitor the PDCCH in the off-section.
  • the onDuration timer is used to define the on-section.
  • the On-section may be defined as a section in which the onDuration timer is running.
  • the onDuration timer specifies the number of consecutive PDCCH-subframes at the start of the DRX cycle.
  • the PDCCH-subframe indicates a subframe in which the PDCCH is monitored.
  • a section in which the PDCCH is monitored may be further defined.
  • a period in which the PDCCH is monitored is collectively defined as an active time.
  • the active time may include an on-section for monitoring the PDCCH periodically and a section for monitoring the PDCCH due to an event occurrence.
  • CA carrier aggregation
  • the carrier aggregation system refers to aggregating a plurality of component carriers (CC).
  • CC component carriers
  • a cell may mean a combination of a downlink component carrier and an uplink component carrier or a single downlink component carrier.
  • a cell may be divided into a primary cell, a secondary cell, and a serving cell.
  • the primary cell means a cell operating at a primary frequency
  • the NB IoT device performs an initial connection establishment procedure or a connection reestablishment procedure with the base station, or a handover procedure as a primary cell. It means the indicated cell.
  • the secondary cell refers to a cell operating at the secondary frequency, and is established and used to provide additional radio resources once the RRC connection is established.
  • a plurality of CCs that is, a plurality of serving cells, may be supported.
  • Such a carrier aggregation system may support cross-carrier scheduling.
  • Cross-carrier scheduling is a resource allocation of a PDSCH transmitted on another component carrier through a PDCCH transmitted on a specific component carrier and / or other components other than the component carrier basically linked with the specific component carrier.
  • a scheduling method for resource allocation of a PUSCH transmitted through a carrier is a scheduling method for resource allocation of a PUSCH transmitted through a carrier.
  • FIG 5A illustrates an example of Internet of Things (IoT) communication.
  • IoT Internet of Things
  • the IoT refers to the exchange of information through the base station 200 between the IoT devices 100 without human interaction or the exchange of information through the base station 200 between the IoT device 100 and the server 700.
  • IoT communication is referred to as CIoT (Cellular Internet of Things) in that it communicates with a cellular base station.
  • Such IoT communication is a kind of machine type communication (MTC). Therefore, the IoT device may be referred to as an MTC device.
  • MTC machine type communication
  • IoT services are differentiated from services in a communication involving a conventional person, and may include various categories of services such as tracking, metering, payment, medical field services, and remote control.
  • IoT services may include meter reading, water level measurement, the use of surveillance cameras, and inventory reporting on vending machines.
  • IoT communication has a small amount of data to be transmitted and rarely generates up and down data transmission and reception, it is desirable to lower the unit cost of the IoT device 100 and reduce battery consumption in accordance with a low data rate.
  • the IoT device 100 since the IoT device 100 has a feature of low mobility, the IoT device 100 has a characteristic that the channel environment is hardly changed.
  • 5B is an illustration of cell coverage extension or augmentation for IoT devices.
  • the base station transmits a downlink channel to the IoT device located in the coverage extension (CE) or coverage enhancement (CE) area, the IoT device Will have difficulty receiving it.
  • the base station if an IoT device located in the CE region simply transmits an uplink channel, the base station has difficulty receiving it.
  • a downlink channel or an uplink channel may be repeatedly transmitted on several subframes.
  • transmitting uplink / downlink channels repeatedly on a plurality of subframes is called a bundle transmission.
  • 5C is an exemplary diagram illustrating an example of transmitting a bundle of downlink channels.
  • the base station transmits a downlink channel (eg, PDCCH and / or PDSCH) to several subframes (eg, N subframes) to the IoT device 100 located in the coverage extension area. Repeated transmission on).
  • a downlink channel eg, PDCCH and / or PDSCH
  • subframes eg, N subframes
  • the IoT device or the base station may increase the decoding success rate by receiving a bundle of downlink / uplink channels on various subframes and decoding some or all of the bundle.
  • 6A and 6B are exemplary views illustrating examples of subbands in which an IoT device operates.
  • the IoT device may use a subband (subband) of, for example, about 1.4 MHz. Can be.
  • the region of the subband in which the IoT device operates may be located in the center region (eg, six PRBs) of the system bandwidth of the cell, as shown in FIG. 6A.
  • multiple subbands of an IoT device may be placed in one subframe for multiplexing in subframes between IoT devices, and different subbands between IoT devices may be used.
  • most IoT devices may use a subband other than the center region (eg, six PRBs) of the system band of the cell.
  • Such IoT communication operating on the reduced bandwidth may be called NB (Narrow Band) IoT communication or NB CIoT communication.
  • FIG. 7 shows an example of a time resource that can be used for NB-IoT in M-frame units.
  • a frame that may be used for NB-IoT may be called an M-frame, and the length may be, for example, 60 ms.
  • a subframe that can be used for NB IoT may be called an M-subframe, and the length may be 6ms for example.
  • the M-frame may include ten M-subframes.
  • Each M-subframe may include two slots, and each slot may be 3ms for example.
  • a slot that may be used for NB IoT may have a length of 2 ms, and thus a subframe may have a length of 4 ms and a frame may have a length of 40 ms. This will be described in more detail with reference to FIG. 7.
  • FIG. 8 is another exemplary diagram illustrating time resources and frequency resources that can be used for NB IoT.
  • a physical channel or a physical signal transmitted on a slot in an uplink of an NB-IoT includes N symb UL SC-FDMA symbols in a time domain and is included in a frequency domain. N sc UL subcarriers are included.
  • the uplink physical channel may be divided into a narrowband physical uplink shared channel (NPUSCH) and a narrowband physical random access channel (NPRACH).
  • NPUSCH narrowband physical uplink shared channel
  • NPRACH narrowband physical random access channel
  • the physical signal may be a narrowband demodulation reference signal (NDMRS).
  • the uplink bandwidths of the N sc UL subcarriers during the T slot slot in NB-IoT are as follows.
  • the downlink physical channel may be defined as an index pair (k, l) in the NB-IoT. Control Channel).
  • the downlink physical signal includes a narrowband reference signal (NRS), a narrowband synchronization signal (NSS), and a narrowband positioning reference signal (NPRS).
  • the NSS includes a narrowband primary synchronization signal (NPSS) and a narrowband secondary synchronization signal (NSSS).
  • the NB-IoT reduces bandwidth according to low-complexity / low-cost.
  • (Ie narrowband) is a communication scheme for wireless devices. This NB-IoT communication aims to allow a large number of wireless devices to be connected on the reduced bandwidth. Furthermore, NB-IoT communication aims to support wider cell coverage than cell coverage in the existing LTE communication.
  • the carrier having the reduced bandwidth includes only one PRB when the subcarrier spacing is 15 kHz, as can be seen with reference to Table 1 above. That is, NB-IoT communication may be performed using only one PRB.
  • the PRB to which the wireless device connects to receive the base station may be referred to as an anchor PRB (or anchor carrier).
  • the wireless device may be allocated an additional PRB from a base station in addition to the anchor PRB (or anchor carrier).
  • the PRB which the wireless device does not expect to receive the NPSS / NSSS / NPBCH / SIB-NB from may be referred to as a non-anchor PRB (or non-anchor carrier).
  • the paging procedure is a procedure for switching the terminal to the RRC connected mode when there is downlink data to be delivered to the terminal in the RRC idle state.
  • 9 is an exemplary view illustrating a paging procedure.
  • the base station when the base station receives a paging signal from a mobility management entity (MME) (not shown), the base station is scrambled with a Paging Radio Network Temporary Identity (CR-RNTI). PDCCH (or MPDCCH or NPDCCH) with redundancy check) is transmitted. The base station transmits a PDSCH including a paging message.
  • MME mobility management entity
  • CR-RNTI Paging Radio Network Temporary Identity
  • the terminal decodes a paging message through the PDSCH. And, the terminal establishes an RRC connection procedure to enter the RRC connected mode.
  • the terminal should monitor the PDCCH (or MPDCCH, or NPDCCH) in order to receive the paging message.
  • the monitoring period is short, the period in which the terminal performs blind decoding (BD) is shortened, resulting in an increase in power consumption.
  • BD blind decoding
  • the present disclosures propose introducing a new signal, such as a wake up signal (WUS). That is, the disclosures of the present specification propose methods for reducing power consumption of the terminal by utilizing WUS.
  • a new signal such as a wake up signal (WUS).
  • FIG. 10A is a flowchart illustrating an example of utilizing WUS introduced according to the disclosure of the present specification
  • FIG. 10B is an exemplary diagram illustrating WUS in the time domain.
  • the base station may transmit the WUS before transmitting the PDCCH (or MPDCCH or NPDCCH).
  • the wireless device may monitor the PDCCH (or MPDCCH or NPDCCH) to attempt to receive the paging message.
  • One WUS may indicate that a plurality of paging messages are received.
  • the PDCCH or MPDCCH or NPDCCH
  • the PDCCH may be monitored on several subframes in order to receive a plurality of paging messages.
  • a period during which the wireless device should monitor the WUS may be defined as a wake up signal occasion (WUSO). More specifically, the time interval in which the WUS actually exists in the time domain is called WUSO. In other words, the time interval during which the base station transmits the WUS may be referred to as a WUSO.
  • WUSO wake up signal occasion
  • the schemes presented herein can be applied to NB-IoT. Therefore, hereinafter, the disclosure of the present specification is described in view of an NB-IoT wireless device for monitoring NPDCCH for convenience of explanation. However, the disclosures herein are generally applicable to other systems using wake up signal (WUS).
  • the following description will focus on the operation of performing the monitor and blind decoding of the NPDCCH to receive a paging message for convenience of description, the disclosure of the present specification to perform a blind decoding of a general physical channel, to reduce power consumption Can be applied.
  • the method described herein may be applied to a process of monitoring a UE-specific search space (USS) when the wireless device in the RRC connected mode maintains the C-DRX mode.
  • USS UE-specific search space
  • the following description focuses on an operation in which the base station transmits a WUS to the wireless device so that the wireless device wakes up after monitoring the NPDCCH, but the operation is performed so that the wireless device does not monitor the NPDCCH.
  • the same may be applied to go to sleep operations (or signals).
  • This section proposes a scheme for transmitting specific information using WUS.
  • the information may be expressed in sequence form.
  • a WUS can be expressed using a sequence of the form Zadoff-Chu.
  • the method of expressing the information may be a tone selection based method.
  • information may be classified through a pattern of hopping a tone within a specific time domain. This may be the same way as the frequency hopping pattern used for NPRACH.
  • the method of expressing information may use symbol positions (or other resource units in a distinguishable time domain) in which a specific sequence exists. For example, when the m-th sequence is located in the l-th symbol and the l ⁇ -th symbol in one subframe, information represented by each other may be different.
  • a method of expressing the information a method of expressing information based on a form such as NPDCCH or PHICH may be used.
  • a method of representing information a method of expressing information included in the WUS using a physical channel such as DCI may be used.
  • the information may be used for the purpose of indicating a frequency resource domain for receiving a paging message after the wireless device receives the WUS.
  • the time interval in which the paging message exists may be referred to as a paging occasion (PO). That is, the PO means a time interval in which the base station transmits a paging message.
  • the PO may indicate a specific subframe, not a time interval. In other words, a subframe in which transmission of the paging message starts may be referred to as PO.
  • the wireless device receives the paging message in the PO section. This may be for the purpose of enabling the base station to temporarily control the load of paging using WUS.
  • the information may be used for the purpose of indicating update of system information (eg, MIB or SIB).
  • system information eg, MIB or SIB
  • the wireless device reads the WUS before reading the NPBCH or NB-SIB1. You can know in advance whether the information has changed.
  • the wireless device may be used for notifying whether RRC signaling is updated. This may be aimed at reducing power consumption and latency of the wireless device by reducing the acquisition time of system information.
  • the information may be for subdividing an identifier (eg, UE_ID) or a group identifier of a wireless device that should receive paging.
  • wireless devices performing monitoring in the same WUSO may belong to a group performing monitoring in the same PO time interval.
  • the base station may use information included in the WUS for the purpose of subdividing the wireless devices for actually transmitting paging into detailed groups among the wireless devices in one group. More specifically, for example, if there are a total of N wireless devices that perform monitoring during a specific PO time interval and want to divide it into M subgroups again, the WUS may include a total of M pieces of information that can be distinguished from each other. At this time, if the wireless device receives the WUS by monitoring the WUSO, the wireless device can find out the information on the subgroup to which it belongs from the information included in the WUS.
  • Ways of expressing information using WUS may exist in various ways in addition to the above-described methods, and some examples thereof will be described later.
  • a specific interval for monitoring WUS can be defined as a WUSO window. Specifically, this will be described with reference to FIG. 11. In other words, a time interval in which monitoring should be performed to receive a WUS may be defined as a WUSO window.
  • 11 is an exemplary view showing a WUSO window on a time axis.
  • the time interval in which the WUS actually exists in the WUSO window is a WUSO as described above.
  • the wireless device may monitor the WUS for possible subframes within the WUSO window.
  • the size of the WUSO window may include one or more subframes. In this case, information on the size and number of subframes may be indicated through an upper layer signal. Alternatively, the size of the subframe may be indicated through the information contained in the WUS. Alternatively, the WUSO may be in units of several symbols or slots.
  • the WUSO window may be set to absolute time. In this case, the absolute time may mean the number of consecutive subframes regardless of whether the subframe is valid. In this case, the WUS may be determined to be transmitted in a valid subframe within the WUSO window.
  • the WUSO window may have the same meaning as the subframe in which the actual WUS is transmitted.
  • the following description is used to describe the WUSO window and WUSO.
  • the frequency domain resource in which the WUSO to be monitored by the wireless device exists may be the same area as the frequency domain resource in which a paging message to be monitored is received.
  • the wireless device may be arranged to monitor the WUSO on the same carrier as the anchor (or non-anchor) carrier that monitors the paging message. This is to reduce the power consumed by the wireless device to perform frequency readjustment when the frequency resource is changed.
  • the WUSO can be arranged to occur at regular intervals.
  • the period of the WUSO may be determined as a fixed time (or number of subframes) through a higher layer signal. In this case, all the wireless devices can apply the same period set by the higher layer signal.
  • the period of the WUSO may be determined by a specific value for each wireless device. If the wireless device is set to the WUSO period common to all wireless devices by the upper layer signal, and the WUSO is set to a specific value for each wireless device, the wireless device and / or the base station is set to the period and the wireless device through the higher layer signal It may be assumed that the period of the WUSO is set based on a shorter period among specific periods.
  • the period of the WUSO may be indicated through information contained in the WUS.
  • the manner in which the period of the WUSO is expressed may represent an absolute time (or the number of subframes) or may be determined by the number of POs that may occur between two WUSOs.
  • the period of the WUSO is expressed by the number of POs, the period may be set in the form of a multiple of the period of the PO.
  • the WUSO may be set to postpone after the invalid subframe. have. If the wireless device detects a WUS assigned to it during WUSO, if the PO and WUSO collide or overlap some or all of the time resources within the interval of the paging window indicated by WUS, the wireless device gives up WUSO and PO Monitoring can be performed during the time interval. That is, when the reception of the WUS is abandoned, the reception of the paging message may be monitored during the PO corresponding to the WUSO, regardless of whether the WUS is transmitted in the WUSO.
  • the base station may assume this operation of the wireless device and schedule the WUSO. If the WUSO and PO collide or overlap some or all of the time resources in a section other than the paging window indicated by the WUS, the wireless device may be arranged to monitor the WUSO.
  • the WUSO may be determined to drop. In this case, even if the WUS is not sent when performing an operation such as go to sleep, the probability that the wireless device misses the paging message allocated to the wireless device does not increase.
  • the paging message may not exist during a certain gap before the interval in which the WUSO is set. That is, the paging message may not be attempted during the specific gap period. This may be for ensuring the time for blind decoding the NPDCCH in the PO.
  • the gap is set to be the n gap_p_to_w subframe based on the downlink subframe, the paging window may be determined to include only the n gap_p_to_w subframe before the generation time of the WUSO .
  • the wireless device may be determined not to expect a PO in this section.
  • the size of the gap may apply the same period set by the higher layer signal.
  • the size of the gap may be indicated through the information contained in the WUS.
  • the WUSO may not exist during a specific gap after the interval in which the PO is set. That is, the WUS may not be attempted during the specific gap period. This may be for ensuring the time for blind decoding the NPDCCH in the PO. In this case, even if the WUS is not monitored when performing an operation such as go to sleep, the probability that the wireless device misses the paging message allocated to the wireless device does not increase.
  • the terminal may be determined not to attempt to receive the WUS during the WUSO. Instead, the UE may assume that a PDCCH (or NPDCCH) may be transmitted even when the WUS is not transmitted from the base station during the corresponding WUSO.
  • the search space for a specific purpose may be a purpose for receiving a RAR, or a location set for SC-PtM operation. The statements can be made to apply only to a specific WUS design when more than one type of WUS design is used.
  • WUS which is not used for synchronization purposes, refers to a design that is not easy for a wireless device to use for receiving a synchronization signal, and must not be used for acquiring a synchronization signal or that a corresponding function does not exist. It does not mean. For example, this is the case for a long ZC sequence in which RE mapping is performed over several OFDM symbols such as NSSS.
  • puncturing or dropping when the WUS collides with another signal or channel or when some or all overlaps occur in a time resource, it may be determined whether puncturing or dropping is applied according to the extent of the collision. For example, if the collision with other CSS is small, puncturing is applied, drop the WUS only when the collision exceeds a certain size, and assume that the NPDCCH can be transmitted without transmitting the WUS. Can be decided. Meanwhile, puncturing may be applied to wireless devices located in a specific coverage extension area and repeating reception. In the case of dropping, when the size to be punctured is excessively large, it may be the purpose of preventing transmission of meaningless WUS from the viewpoint of the base station.
  • the criterion for determining either puncturing and abandonment may be determined by the absolute number of time domain units (eg, symbols or subframes) in which the collision of the WUS occurs.
  • a criterion for determining puncturing or abandonment may be determined based on a rate at which a collision occurs based on a set interval of WUS.
  • the reference values may be predetermined fixed values or may be set by the base station and instructed by the wireless device through higher layer signals.
  • the definition and setting for the paging window follows the contents described in the second disclosure. If the system does not require a paging window, the paging window may have the same meaning as all the intervals for monitoring the PO between WUSOs, even if there is no definition.
  • the method of determining the WUSO may be one of the methods described below.
  • the WUSO window may be defined as an offset n w_offset relative to a paging occasion (PO).
  • 12A is an exemplary diagram illustrating a first scheme of the second disclosure.
  • FIG. 12A a method of determining a WUSO window according to the first method of the second disclosure is illustrated.
  • other types of approaches using WUS are possible, other than shown.
  • the start subframe of the WUSO window may be determined as the nn w_offset th subframe.
  • the value of n w_offset may be a value set as an upper layer parameter. If the value of n w_offset is not set, the wireless device may use a predetermined default value.
  • the value of n w_offset may be a value determined by an identifier (eg, UE_ID) of the wireless device.
  • the identifier (eg, UE_ID) of the wireless device used to determine the PO may be broken down to set the WUSO window.
  • the value of n w_offset that determines the WUSO window based on the identifier (eg, UE_ID) of the wireless device may be defined by the following equation.
  • f (x) is a function corresponding to the value of n w_offset and x and may exist in the form of a predefined table.
  • ⁇ may be used for the purpose of dividing the wireless devices having the identifier (eg, UE_ID) of the wireless device into ⁇ subgroups by a specific constant value.
  • ⁇ may be indicated through information expressed using higher layer signals and / or WUS.
  • the value of n w_offset may be indicated through information contained in the WUS.
  • the indicated value of n w_offset may be for controlling the WUSO to be monitored by the wireless device afterwards.
  • the value of n w_offset that determines the WUSO based on the information may be defined by the following equation.
  • f (x) is a function corresponding to the value of n w_offset and x and may exist in the form of a predefined table.
  • n w_offset defined above may be counted based on valid subframes only. This may be for preventing a case where a gap between the WUSO and the PO varies according to the number of invalid subframes or a sufficient repetition of the WUS is not obtained.
  • the value of n w_offset defined above may be counted in absolute time units. This may be counting all subframes without valid / invalid subframe division. This may be for preventing the WUSO starting subframe location from varying according to the number of invalid subframes, so that the time between the WUS monitoring and the reception of the paging message is excessively long.
  • the period at which the WUSO window occurs may have a different value from the period at which the PO occurs. If the period in which the window WUSO occurs that is defined as a period T, WUSO can be determined to occur at a position offset of PO generated every T period. For example, the size of the T period may have a value equal to the eDRX value. In this case, when the wireless device in the sleep mode by the eDRX size starts the active mode, it may be used for the purpose of determining whether to monitor the NPDCCH in the corresponding active mode interval. If a wake up is not detected in the corresponding WUSO or a go to sleep command is detected, the wireless device may not perform NPDCCH monitoring in the corresponding active mode section.
  • the starting subframe position of the WUS determined by the offset may be determined as the nearest valid subframe position appearing after the subframe position designated by the offset.
  • the starting subframe position may be determined to be the same, and instead, puncturing an invalid subframe period.
  • the description may be modified to determine the end time (or ending occasion) of the WUSO window based on the offset. This may be to ensure that the gap between the WUSO window and the PO is always a certain size.
  • the size of the gap may be an absolute time, which may be counting the number of all subframes without distinguishing between valid and invalid subframes.
  • the proposed schemes can be modified such that the start offset for setting the start subframe and the end offset for setting the end subframe are used simultaneously. Specifically, it will be described with reference to Figure 12b.
  • the WUSO window may be determined as a section between a position indicated by the start offset n w_offset_start and a position indicated by the end offset n w_offset_end .
  • the transmission of the WUS may be transmitted to start based on the start subframe position of the WUSO or to end based on the end subframe position. If the number of valid subframes for performing the WUS repetition is insufficient within the interval of the WUSO, the WUS may be determined to be transmitted as much as possible without using all the repetitions.
  • Another way to determine the WUSO may be to use a fixed location determined by the higher layer signal.
  • the location of the WUSO may be indicated in the form of a bit map through the SIB.
  • the subframe corresponding to the WUSO may be set to an invalid subframe.
  • the location of the WUSO may be indicated through the SIB to appear every specific period. In this case, there is an advantage that the overhead of expressing the position corresponding to the WUSO can be reduced.
  • the two examples presented above may each be used independently or in a combined manner.
  • Possible positions of the WUSO indicated through the higher layer signal may be selectively used by subdividing by the identifier (eg, UE_ID) of the wireless device. For example, if the total number of possible locations of the WUSO indicated by the higher layer signal is N, the identifier of the wireless device (eg, UE_ID) may be divided into a total of M subgroups. At this time, the size of M is smaller than N, and a value obtained by dividing N by an arbitrary integer may be used. In this case, the same number of WUSOs may be mapped to each subgroup. For example, when there are N available WUSO positions, a detailed group for monitoring the n w_HLS th positions may be determined to satisfy a condition of the following equation.
  • the M value may be indicated to the wireless device through information expressed using higher layer signals and / or WUS.
  • Possible positions of the WUSO indicated through the higher layer signal may be selectively used by subdividing by the identifier (eg, UE_ID) of the wireless device.
  • the wireless device may be divided into a total of M subgroups. At this time, the size of M is smaller than N, and a value obtained by dividing N by an arbitrary integer may be used.
  • different number of WUSO can be mapped to each subgroup. For example, N bm
  • the bitmap of size n w_HLS subgroup to monitor the second position can be determined so as to satisfy the following equation in the same conditions.
  • the M value may be indicated to the wireless device through information expressed using higher layer signals and / or WUS.
  • FIG. 13 is an exemplary view illustrating a second scheme of the second disclosure.
  • n w_offset may be determined as any one of integer multiples of the periodic paging DRX of the PO. For example, the value of n w_offset that determines the WUSO may be defined by the following equation.
  • ⁇ represents the number of subgroups for subdividing the wireless devices having the identifier (eg, UE_ID) of the wireless device with a specific constant value.
  • the c value may be an arbitrary integer value as a specific constant value and may be designated through information expressed using higher layer parameters and / or WUS. Alternatively, the c value may be a predefined fixed value.
  • the WUSO may be determined to be deferred to the position of the next PO.
  • the wireless device may attempt to detect both WUS and paging in the PO designated as WUSO. This may be aimed at ensuring flexibility by allowing the base station to transmit paging without sending a WUS at a location designated as the WUSO.
  • the first example described may be for ensuring flexibility for a wireless device in an RRC connected mode.
  • FIG 14 is an exemplary view showing a first example of the third scheme of the second disclosure.
  • the position where the WUSO appears may be determined to use a fixed position determined by a higher layer signal.
  • the location of the WUSO may be indicated in the form of a bitmap through the SIB.
  • the subframe indexes represented by the bitmap may be targeted to only subframes set to PO.
  • each bit represents N PO POs. If segmentation is applied to a group of wireless devices that share the same PO as in the second method, the subgroup using n w_offset th PO as a WUSO may be determined to satisfy a condition of the following equation.
  • the M value may be indicated to the wireless device through information expressed using higher layer signals and / or WUS.
  • the wireless device may attempt to detect both WUS and paging in a PO designated as WUSO. This may be for ensuring flexibility by allowing the base station to transmit paging without sending a WUS at a location designated as the WUSO.
  • 15 is an exemplary diagram illustrating a second example of the third scheme of the second disclosure.
  • a method of determining a paging window using WUS is shown according to a second example of the third method of the second disclosure.
  • other types of approaches using WUS are possible, other than shown.
  • the position at which the WUSO appears may be determined to be freely set by the base station.
  • the wireless device determines that WUSO is possible in all POs. Therefore, the wireless device may perform all operations for monitoring WUS or monitoring paging in the PO or select one operation. This may be for instructing a specific group of wireless devices to change specific information related to paging using WUS. At this time, it may be determined to use a PO that is already set up without allocating a separate resource for the WUSO.
  • 16 is an exemplary view showing a third example of the third scheme of the second disclosure.
  • a method of determining a paging window using WUS is illustrated.
  • the bit size of the corresponding DCI format is equal to the DCI format bit size of the NPDCCH transmitted to the PO used by the WUSO. It can be determined to have a value. This may be for the wireless device in the WUSO to monitor both the WUS and the existing NPDCCH without increasing blind decoding.
  • the WUSO may be determined to be transmitted in a subframe, such as a subframe in which a synchronization signal is transmitted, or in an adjacent subframe. This may be for the purpose of increasing the accuracy of time synchronization in acquiring the WUSO, or reducing the delay that may occur between the operation of the WUSO monitoring and the acquisition of the synchronization signal.
  • the WUSO may be determined to be formed in the subframe in which the PSS or SSS is transmitted.
  • the WUSO may be determined to be formed in a subframe adjacent to the subframe in which the NPSS or NSSS is transmitted.
  • the position of the WUSO may be determined to select the same or adjacent subframe as the PSS / SSS (or NPSS / NSSS) closest to the PO corresponding to the WUSO. This may be aimed at minimizing the time delay spent in acquiring the synchronization signal, monitoring the WUSO, and monitoring the paging.
  • the position of the WUSO may use the position of a special subframe.
  • whether to apply (or set) the WUSO may be determined according to the special subframe configuration information.
  • the wireless device may determine whether the WUSO is set / applied through the configuration information of the special subframe. For example, in the case of a special subframe setting having a short length of DwPTS, the wireless device may determine that the base station does not transmit the WUS. The wireless device may determine that the WUSO is set in the case of setting a special subframe having a long DwPTS.
  • the WUSO When the special subframe is set for the use of the WUSO, the WUSO may be set to be set at a specific period. To this end, the base station may instruct the wireless device information about the start position and the period. The indication may be performed through higher layer signals such as SIB or RRC signals. In this case, the corresponding information may be determined wirelessly or group-specifically of the wireless device. The determined location of the WUSO may estimate the location of the WUSO based on information informed by the base station and the wireless device's own identifier (eg, UE ID). Alternatively, the special subframe used for the WUSO may include only specific special subframes.
  • the base station may instruct the wireless device information about the start position and the period.
  • the indication may be performed through higher layer signals such as SIB or RRC signals.
  • the corresponding information may be determined wirelessly or group-specifically of the wireless device.
  • the determined location of the WUSO may estimate the location of the WUSO based on information informed by the base station and the
  • a method of indicating a subframe number or a radio frame number may be used, or a form such as a bitmap may be used.
  • the corresponding information may be determined specifically for the wireless device or for the group-specific group of the wireless device.
  • the corresponding position may be determined dependent on the position where the synchronization signal is transmitted. For example, when it is necessary to acquire the downlink synchronization signal before the detection of the WUS, the position of the WUSO may be determined as the closest special subframe position among the subframes following the SSS (or NSSS). This may be aimed at minimizing the time delay consumed after acquiring the synchronization signal and monitoring the WUS.
  • the WUS can be detected without an accurate downlink synchronization signal, but if the downlink time synchronization needs to be accurately adjusted to monitor the downlink channel after the WUS, the position of the WUSO is located before the SSS (or NSSS). It may be determined as the location of the closest special subframe among the subframes. This may be aimed at minimizing the time delay consumed after acquiring the WUS and acquiring the downlink synchronization signal.
  • the wireless device may determine whether to monitor the WUS according to its coverage extension level.
  • special subframe configuration information may be used as another condition for determining whether to monitor. For example, the wireless device may abandon the WUSO monitoring if it determines that its coverage extension level is above a certain threshold value through its RSRP. In this case, the threshold value may be changed according to the special subframe configuration. This may be for the purpose of preparing a case where it is difficult to acquire WUS for a wireless device located in a high coverage extension area in a situation in which the length of the special subframe is limited and the repeated reception is limited.
  • This section proposes a method of using the WUS for the purpose of indicating a paging window and / or PO for the wireless device to perform NPDCCH monitoring.
  • the wireless device may monitor the WUSO assigned to it and determine whether there is a paging window and / or PO that it should monitor.
  • the paging window is defined as a period in which the wireless device monitors the PO in order to read the paging message.
  • the WUS is used for instructing a wake up operation of the wireless device.
  • the paging window may be used as a section in which the wireless device does not monitor the PO.
  • the WUS is used for instructing go to sleep of the wireless device.
  • the wireless device monitors the NPDCCH for POs that may occur in the paging window.
  • the location where the paging window is set may be determined to be after a certain gap from the WUSO.
  • This gap may be for the wireless device to prepare for detecting WUSO and monitoring paging. Or it may be for the purpose of giving flexibility to the scheduling of the WUSO and PO.
  • the size of the gap may be determined through a higher layer signal. If not, the gap size may be determined according to a default value. Alternatively, the size of the gap may be indicated through the information contained in the WUS. For example, this gap may be determined to be an n gap_w_to_p subframe based on a downlink subframe. In the case of a paging window, even if an invalid subframe is included in the middle, the interval may be determined so as not to change.
  • the wireless device may not expect the generation of PO in a section other than the paging window. This may be for the purpose of reducing the burden of blind decoding performed by the wireless device by limiting the section in which the actual base station can transmit the paging message.
  • the paging window may be defined as the interval from after the WUSO is monitored (or from the time the gap is applied after the WUSO is monitored) before the next WUSO occurs. In this case, the wireless device has an advantage of determining a paging window without acquiring a separate signal.
  • the paging window may include an interval set through higher layer parameters from after the WUSO is monitored (or from the time the gap is applied after the WUSO is monitored). In this case, by limiting the location of the PO to be monitored by the wireless device, the power consumption due to blind decoding can be reduced.
  • This section proposes a way to use the WUS for the purpose of controlling the paging DRX cycle in which the wireless device performs NPDCCH monitoring.
  • the wireless device may monitor the WUSO assigned to the wireless device and determine the period of the PO through which the base station transmits the actual NPDCCH. This is to reduce the DRX cycle of some wireless devices while maintaining the paging DRX cycle in terms of the entire cell, if the paging demand of a particular wireless device or a certain group of wireless devices is higher than other wireless devices during a certain period. May be the purpose.
  • the DRX cycle of some wireless devices may be increased while maintaining a paging DRX cycle from an overall cell perspective. It may be for the purpose.
  • the wireless device that detects the WUS may use the new PO period T PO_new .
  • T PO_new may be determined as a constant multiple of T PO .
  • the following equation may be followed.
  • the c value may be designated through information expressed using a higher layer signal and / or a WUS as a constant value.
  • the C value may be a fixed value.
  • the T PO_new value may be designated through information expressed through higher layer signals and / or WUS.
  • the T PO_new value may be a predetermined fixed value.
  • the section to which the new T PO_new is applied after detecting the WUS can be limited to within a certain subframe after detecting the WUS.
  • this section may be determined by a higher layer parameter.
  • the size of this section may be indicated through the information contained in the WUS. This may be for the purpose of allowing the wireless device to perform normal operation again by applying the original period T PO again after a certain period even if the WUS fails to detect the WUS.
  • the interval to which T PO_new is applied may be limited to within a predetermined subframe after adding a delay as much as a predetermined gap at the time of detecting the WUS.
  • 17 is an exemplary view showing a solution according to the fourth disclosure.
  • the subframe index where the WUS is detected is n.
  • n gap_w_to_p the size of the gap set after the WUS before monitoring the PO
  • n PO_new the length of the subframe interval to which T PO_new is applied
  • n gap_w_to_p and ends can be determined by n + n gap_w_to_p + n PO_new. If this section is not defined or if the wireless device fails to acquire the information, the wireless device may determine the section as the point in time at which the next WUS is detected.
  • the position of the WUSO can be determined based on the original PO period T PO only. This may be a method for preventing the wireless device from missing the next WUSO even if the wireless device fails to monitor the WUS.
  • the location of the WUSO may be selected based on a larger value of the values of T PO and T PO_new .
  • the scheme proposed in this section can be applied for the purpose of instructing the wireless device not to perform paging monitoring for a certain period of time.
  • T PO_new is regarded as infinite or T PO_new is set to a value larger than the interval n PO_new to which the value of T PO_new is applied, the base station has the same effect.
  • the wireless device detects the WUS in the WUSO corresponding to the wireless device, the paging may not be monitored for a predetermined period.
  • the wireless device may be configured to monitor the WUS. This may be for the purpose of reflecting when information on paging monitoring is changed.
  • the interval for not performing paging monitoring may be determined through higher layer signals.
  • a section in which no paging monitoring is performed may be indicated through information contained in the WUS.
  • the corresponding interval may be represented by the number of consecutive subframes. Or it may be represented by the number of PO. If the wireless device does not acquire the corresponding information or there is no information to be set, the wireless device may operate based on a predetermined fixed value.
  • the added PO may have a method independent of the determination method of the cell common PO that the wireless device has previously. For example, assuming that the subframe index of the PO determined as the cell common PO is a period T c based on n c , the subframe index of the added PO may have a period T add based on n add . . This may be aimed at ensuring the flexibility of the PO in a situation where the paging demand for a particular wireless device or a specific group of wireless devices is temporarily increased.
  • the position where the additional PO starts may be after a subframe of a predetermined size in the subframe in which the WUS is detected.
  • an interval between subframe positions of the additional PO from the subframe from which the WUS is detected may be set through a higher layer signal.
  • the interval between subframe positions of the additional PO from the subframe in which the WUS is detected may be indicated through information contained in the WUS.
  • the interval for monitoring PO added after detecting WUS can be limited to within a certain subframe after detecting WUS.
  • this section may be determined by a higher layer parameter.
  • this section may be indicated through information contained in the WUS. This may be for the purpose of allowing the wireless device to monitor the original PO again after a certain period even if the wireless device fails to detect the WUS. Alternatively, the wireless device may be able to suspend additional POs by themselves even if they do not receive a separate release signal.
  • n start_add when the gap for designating a subframe in which an additional PO is started is n start_add and the size of the subframe interval in which additional POs are monitored is defined as n dur_add ,
  • the wireless device that detects the corresponding WUS may monitor additional POs in subframes from n0 + n start_add to n0 + n start_add + n dur_add .
  • the new PO when the wireless device detects a WUS indicating additional PO, the new PO may be monitored without monitoring the existing PO. This may be aimed at reconfiguring the PO while minimizing an increase in blind decoding of the wireless device when a location of the PO is advantageous to a specific wireless device or a specific group of wireless devices in view of scheduling flexibility.
  • the radio resource used to transmit the generated WUS may be defined in block units consisting of one or more REs.
  • a block used by one WUS is referred to as a wake up signal block (WUSB).
  • WUSB wake up signal block
  • the WUSB may have one or more sequences grouped together.
  • This section includes ways to determine the size at which WUSB repeats.
  • the repetitive size of WUSB can be used in one of the following ways. In the following description, a description has been made as a method of determining a repetition unit of the WUSB, but the same may also be used as a method of determining a section in which a WUS is transmitted in the time domain.
  • the size of the repetition of the WUSB may be determined by an upper layer parameter set for paging. This may be for the purpose of enabling the wireless device that detects the WUS to detect paging as well.
  • the size of the repetition of the WUSB may be a certain positive integer value that is mapped through a higher layer parameter defined for paging.
  • the repetition size of the WUSB may have a value equal to the repetition size of the paging.
  • the repetition size of the WUSB may be determined as a function of R max set for paging.
  • the maximum repetition size of the WUSB may be determined not to exceed a predetermined size. This may be to reduce the power consumption required for the wireless device to monitor the WUSB.
  • the size of the repetition of the WUSB may be indicated through an upper layer signal set for the WUS.
  • corresponding information may be transmitted through a signal that can be acquired by a wireless device in an RRC IDLE state such as an SIB.
  • the repetition size of the WUSB may be determined by a combination of a higher layer parameter set for WUS and a higher layer parameter set for paging. This may be for the purpose of supporting an appropriate repetition level while reducing the overhead of information for setting the repetition level of the WUS.
  • the specific method of applying this may be one of the following two options.
  • the repetition number represented by using N bits is determined by the number of repetitions used for paging. Can be determined. For example, suppose that the value of the number of repetitions corresponding to N bits representing the upper layer parameter for setting the repetition of the WUSB exists in the form of a table. The table may be different depending on a section to which the R max value which determines the number of repetitions of paging belongs.
  • the value interpreted using the N bits may be a certain positive integer value R mp .
  • the repetition value of WUSB may be determined as R mn * R max .
  • the repetition level of the WUS may be set differently for each carrier. This may be due to a difference in transmission resources available for each carrier or different radio channel environments.
  • the repetition level of the anchor carrier and the repetition level of the non-anchor carrier may be different from each other. In this case, a method of independently setting the repetition level of each carrier through an upper layer signal may be used.
  • the repetition level of the non-anchor carrier may be designated as a multiple of the anchor carrier. In this case, the repetition level and multiple of the anchor carrier may be indicated by a higher layer signal.
  • different WUS repetition levels may be determined.
  • the size of WUSB is set by the base station.
  • the size of the WUSB may be determined by the length of the sequence used by the base station.
  • the wireless device may estimate the length of the sequence to be used according to the size of the set WUSB.
  • the size of the WUSB can be used in one of the following ways, or in combination with one or more embodiments.
  • the size of the WUSB may be determined as a function of a higher layer parameter that sets the repeat size of the WUSB (or paging), or the repeat size of the WUSB (or paging). For example, in the case of NB-IoT, the size of WUSB may be determined as a function of R max set for paging.
  • the size of the WUSB may be determined through an upper layer parameter set for the size of the WUSB.
  • the corresponding information may be transmitted through a signal such as an SIB that can be acquired by a wireless device in an RRC IDLE state.
  • a base station can operate all of WUSBs of different sizes.
  • each WUSB may be transmitted through different time and / or frequency resources.
  • Configuration information for each WUSB may be directed to the wireless device through a higher layer signal such as SIB.
  • the wireless device may be configured to monitor the WUSO in which the corresponding WUS is set by selecting a WUSB suitable for the wireless device. This may be aimed at reducing power consumption of the wireless device while supporting various coverages in a situation where the base station does not know the channel state of the wireless device.
  • This section describes how a base station sets the amount of information that can be represented via WUS.
  • the amount of information that can be represented through the WUS may be determined by the number of sequences operated by the base station.
  • the wireless device may estimate the WUS to be monitored according to the number of sequences set by the base station.
  • the amount of information that can be expressed through the WUS may be the number of bits representing meaningful information in the DCI.
  • the wireless device may perform blind decoding according to the bit size set by the base station, or recognize the meaningless information as a predetermined fixed value and perform decoding.
  • the amount of information that can be represented through the WUS can be determined by one of the following embodiments.
  • the number of sequences is shown as an example. However, it is obvious that the number of sequences can be generally applied to other methods that can determine the amount of information that can be represented through the WUS, such as the number of bits of the DCI.
  • the number of sequences used for the WUS may be determined as a function of a higher layer parameter that sets the repetition size of the WUSB (or paging) or the repetition size of the WUSB (or paging).
  • the size of the WUSB may be determined as a function of R max set for paging.
  • the number of sequences used for the WUS may be determined through higher layer parameters set for the number of sequences used for the WUS.
  • the corresponding information may be transmitted through a signal such as an SIB that can be acquired by a wireless device in an RRC IDLE state.
  • the number of sequences used for the WUS may be determined by the size of a group of wireless devices monitoring the same WUSO. For example, the number of sequences may be determined based on higher layer parameters used when determining the identifier (eg, UE_ID) of the wireless device.
  • UE_ID the identifier
  • the proposed content may be used for the purpose of indicating whether the wireless device should monitor POs of a specific location based on DCI.
  • the DCI used for this purpose will be described as a new DCI for convenience.
  • the new DCI may be configured to be detected in the same search space as the NPDCCH for paging. This means that a new DCI can be transmitted in the PO. Accordingly, the wireless device may blind decode both the NPDCCH for the new DCI and the NPDCCH for the paging in the search space to be monitored according to its DRX. In this case, the new DCI may be determined to have a format of the same size as the NPDCCH for paging.
  • the number of bits represented by the new DCI is the same as the number of bits represented by the DCI for paging. This may be for the purpose of reducing the number of blind decoding required for the wireless device to detect two DCIs.
  • the new DCI may be masked with a CRC having an independent RNTI to be distinguished from the DCI for paging. This may be for distinguishing two DCIs having the same format size in the same search space.
  • the new DCI may include information on a specific wireless device or a specific group of wireless devices. This information may be for identifying a wireless device to receive the new DCI among wireless devices monitoring the PO. If the wireless device confirms its identifier or an identifier of a group to which the wireless device belongs through the information of the new DCI, the wireless device may monitor the PO generated for a certain period of time. If the wireless device fails to check its identifier ID or the identifier for the group to which it belongs, the wireless device may continuously monitor the next PO.
  • the new DCI may include information specifying whether to monitor one or more POs.
  • the wireless device may need to perform a wake up operation. And, for the PO determined not to monitor through the new DCI, the wireless device may need to perform a go to sleep operation.
  • the information may be expressed in the form of a bitmap, and may indicate whether the wireless device should monitor N consecutive POs after the PO where the new DCI is detected.
  • the new DCI may be specifically transmitted according to one of the following options.
  • the base station transmits the new DCI after determining a required time point among the transmittable POs.
  • the new DCI is transmitted at a predetermined period from a predetermined start position.
  • the new DCI is transmitted in an occurrence period indicated by a bitmap.
  • scheduling flexibility is increased in that the base station can transmit only when it determines that the new DCI is needed.
  • the base station determines the corresponding location and informs the wireless device of the location through higher layer signals such as SIB or RRC signals. However, this increases the signaling overhead.
  • the base station may not transmit the new DCI. This may be because the new DCI is not needed at the corresponding location, or the corresponding PO should be used for NPDCCH transmission for paging.
  • the wireless device may not monitor the new DCI even if the location is capable of transmitting the new DCI as specified through the option 2 and option 3 scheme. have. This may be for the purpose of reducing unnecessary power consumption of the wireless device.
  • Whether the new DCI is used may be indicated through higher layer signals such as SIB or RRC signaling.
  • the wireless device If the wireless device already recognizes whether to monitor the PO through the first new DCI and monitors the PO indicated by the first new DCI, the wireless device continues whether or not the second new DCI exists. Can be monitored. In this case, the PO for monitoring the second new DCI may be determined to target only the PO indicated by the first new DCI. If the wireless device detects its identifier or the second new DCI for the group to which it belongs, the wireless device discards the information on the first new DCI previously received and monitors according to the second new DCI. PO can be determined.
  • the wireless device can monitor the PO in all possible sections. This means that the location of the existing monitoring PO is applied the same as the existing rules. (The rule used here is to determine the PO that is monitored by a wireless device that does not have the ability to distinguish a new DCI.)
  • the WUS may be used by the base station to inform a specific wireless device or a group of wireless devices that a corresponding PDCCH (or MPDCCH, or NPDCCH) will be transmitted.
  • a corresponding PDCCH or MPDCCH, or NPDCCH
  • the WUS may be used to inform a specific wireless device or a group of wireless devices that a PDCCH (or MPDCCH, or NPDCCH) will not be transmitted.
  • a PDCCH or MPDCCH, or NPDCCH
  • the WUS may be used for indicating whether there is a PDSCH (or NPDSCH) that the wireless device expects. For example, in the case of PDSCH (or NPDSCH) transmission that does not require separate DL grant information, the WUS may be used for the purpose of indicating whether the PDSCH is transmitted while restricting the BD of the wireless device.
  • the WUS may be used for the purpose of confirming whether the wireless device updates specific information.
  • a transport channel for transmitting system information such as PBCH (or NPBCH) or SIB1 (or SIB1-BR, SIB1-NB)
  • SIB1 or SIB1-BR, SIB1-NB
  • the WUS may be used for the purpose of the wireless device skipping specific NPDCCH monitoring and performing downlink reception or uplink transmission according to preset information.
  • the configuration information used may be previously specified through higher layer signals such as SIB or RRC signals.
  • the wireless device may be used for the purpose of presenting the information of the previously received DCI as it is.
  • the wireless device applies the same type of DL grant when receiving a continuous downlink channel
  • the wireless device that detects the corresponding WUS can skip monitoring of the associated NPDCCH.
  • the wireless device applies the same type of UL grant when transmitting a continuous uplink channel
  • the wireless device that detects the corresponding WUS may skip monitoring of the associated NPDCCH.
  • the WUS may be generated in a form based on a ZCoff (Zadoff-Chu) sequence and a bit sequence. At this time, the WUS may be expressed by the following equation.
  • N is a value representing an index of the sequence, and has a value between 0 and N-1 when the length of the sequence is N.
  • the length N of the sequence may be determined by the unit of the RE group in which one WUS is represented. For example, the value of N may be determined according to the size of the OFDM symbol used. If the WUS sequence is represented through n sym symbols and the number of subcarriers included in one symbol is n subcarriers , the length N of the WUS sequence may be expressed as follows.
  • the size of n subcarriers in NB-IoT may be 12.
  • the information expressed at this time may be a wireless device ID (or group ID of a wireless device), a cell ID, an NPDCCH interval to be monitored, time / frequency resource allocation, a new data indication (NDI), a system information indication indication, and a wake up. Or sleeping.
  • b q (n), ⁇ f , and u s may each be used independently or in combination of one or more methods. When more than one method is used in combination, each variable may express separate information or may be used for the purpose of dividing one piece of information. If the information represented includes the ID of the wireless device (or group ID of the wireless devices), the at least one sequence is intended to wake up (or go to sleep) all the wireless devices that monitor the sequence position. Can be used.
  • wake up should be performed for all wireless devices such as system information update, or the purpose is to wake up (or go to sleep) a group of two or more wireless devices.
  • a sequence for informing update of system information may be used separately. This may be for obtaining a benefit of reducing power consumption and delay by acquiring update information using only the WUS without performing an additional operation of monitoring a paging message for a wireless device that can read the WUS when the system information update is determined. have.
  • b q (n) may be in the form of a sequence having a value of 1 or -1.
  • the sequence used may be selected to select some of the rows of the Hadamard matrix.
  • the size of the Hadamard matrix used at this time can be determined to have a value equal to the length N of the WUS sequence. For example, if WUS follows the form of NSSS and is designed to distinguish four pieces of information through b q (n), b 0 (n), b 1 (n), b 2 (n), and b 3 (n) can be chosen to select the 1, 32, 64, and 128th rows of a 128x128 Hadamard mattress, respectively.
  • the WUS follows the NSSS form and is designed to distinguish eight pieces of information through b q (n), the 1st, 16th, 32th, 48th, 64th, 80th, 112th, and 128th of the 128x128 Hadamard matrix You can use rows.
  • a pseudo-random sequence sequence may be used for b q (n).
  • the pseudo-random sequence used may be a length-31 Gold sequence defined and used in the LTE standard TS 36.211, as shown in Equation 11.
  • the distinguished information is determined by initialization of x 2 (n), and may be expressed as in the following equation.
  • C init can have eight different integer values.
  • the length of b q (n) may be determined to have a value equal to the length N of the WUS sequence.
  • the length of N may be determined to include all REs in a symbol in which WUS is used without considering the number of REs that are punctured or overlapped for transmission of the reference signal RS.
  • the length of b q (n) may be determined based on the actual number of REs used in the WUS. For example, if the total number of REs used for WUS in the NB-IoT is 100, the length of the PN-sequence may also be determined to satisfy 100.
  • the length of the WUS sequence is determined by the number of REs used in the WUS
  • the number of REs available in the WUS varies depending on the operation mode
  • the length of the PN-sequence may be determined according to the operation mode. have.
  • ⁇ r can be expressed in the form of the following equation.
  • u s is a value that determines the root sequence index of the ZC sequence and may be expressed as any integer.
  • N ZC the number of integers that can be used as the value of u s may be N ZC in total.
  • the S root sequence indexes to be selected may be selected in order of minimizing PAPR (or CM) of the ZC sequence.
  • the selected S root sequence indexes may be selected so as not to affect or minimize sequence performance for other purposes.
  • the method of mapping the WUS to the resource may be based on a frequency first and time second method.
  • RE element positions used for all reference signal purposes may be determined to be punctured.
  • the REs used for the CRS and the NRS may be determined such that the WUS is punctured. This means that if the WUS decides to use the NB-IoT downlink subframe, the wireless devices can expect the NRS to be transmitted in that subframe, and the previous compatibility for wireless devices that do not have the ability to recognize the WUS supporting structure. backward compatibility).
  • a cover code of a time unit made of one or more symbols may be applied.
  • the time unit used may be one symbol, slot, or subframe, or may be the number of symbols required for resource mapping of one WUS. This may be for distinguishing from signals of other purposes having a structure similar or identical to the designed WUS.
  • a cover code having an orthogonal or low correlation property with a symbol unit cover code used in NPSS is used for WUS.
  • a cover code of a time unit may be used for the purpose of representing information.
  • a plurality of cover codes that are orthogonal to each other or satisfy low correlation components may be used for the purpose of representing information transmitted through the WUS.
  • the wireless device may determine to monitor the associated NPDCCH only when a sequence corresponding to the wake up is transmitted. In this case, when a sequence corresponding to the operation of go to sleep is transmitted, the signal may be used for the purpose of skipping one or more NPDCCH search spaces. If the purpose is to skip one NPDCCH, an operation not transmitting a signal may be performed. In this case, the wireless device may determine a subsequent operation according to the presence or absence of the detected signal and the type of sequence applied in the case of the detection.
  • the above operation may be represented by the following example.
  • the wireless device When the wake up sequence is transmitted: The wireless device performs an operation of monitoring one NPDCCH (or NPDSCH) indicated by the detected signal.
  • the wireless device skips without monitoring one NPDCCH (or NPDSCH) associated with the signal occurrence that attempted detection.
  • the wireless device When a Go to sleep sequence is transmitted: The wireless device performs a skip operation without monitoring a plurality of NPDCCHs (or NPDSCHs) indicated by the detected signals or NPDCCHs (or NPDSCHs) for a predetermined period of time.
  • the form may be a channel including a DCI such as PDCCH (or MPDCCH, NPDCCH).
  • the information included in the DCI includes a wireless device ID (or group ID of wireless devices), a cell ID, an NPDCCH interval to be monitored, time / frequency resource allocation, a new data indication (NDI), a system information update indication, and a wake up or sleeping It can be whether or not.
  • the listed information may be expressed by combining one or more information in the DCI for one WUS.
  • the 1-bit flag indicating whether the WUS is for wake up (or go to sleep) or for notifying the system information update may be used in the DCI.
  • information of 1 may specify operation of wake up (or go to sleep)
  • information of 0 may specify operation of system information update.
  • the information included in the DCI may be different depending on the information of the flag. For example, if a flag indicating a system information update is included, the remaining bits of the DCI may be used for the purpose of indicating information related to the system information update.
  • the corresponding information may be expressed using 1 bit in DCI. For example, information of 1 may indicate a wake up operation and information of 0 may indicate go to sleep. If the corresponding bit plays the same role as the flag, the information represented by the remaining bits may vary depending on the bit represented by the flag. For example, the number of bits for determining a group of wireless devices or an NPDCCH monitoring interval may be defined differently according to a corresponding flag. Alternatively, CRC masking may be used to express information indicating whether to wake up or sleeping. For example, two RNTIs can be specified to refer to wake up and sleeping, respectively.
  • the DCI representing the wake up information and the DCI representing the go to sleep information may be determined to be equal to each other, and the information represented by the bits of each DCI may be different from each other. If a flag indicating a system information update exists, a flag indicating wake up or go to sleep may be selectively checked after reading a flag indicating a system information update. This is because if the WUS is used for notifying the system information update, the wireless device that detects the WUS does not need to select wake up or go to sleep, and the content of the DCI is also changed.
  • the number of DCI bits may be the same as the number of IDs (or group IDs of the wireless devices) to be distinguished.
  • the bit 1 information may be determined not to perform the wake up (or go to sleep) operation, and the 0 information may not be performed to the wake up (or go to sleep) operation.
  • the number of bits for indicating a group of wireless devices may be a total of L. have.
  • one or more groups of wireless devices that are designated with information of 1 to perform an operation among the L groups may be one or more.
  • the value of the size L of the distinguished group may be specified through higher layer signals such as SIB or RRC signals.
  • the maximum usable size of L is L max
  • the size of L indicated through a higher layer signal may be a value between 1 and L max .
  • L max -L bits can be used for other purposes or represented as a fixed value. If a flag indicating whether to wake up or go to sleep is used, the size of L max and / or L may vary depending on the information represented by the flag.
  • the corresponding information may be defined as a time at which a wake up (or go to sleep) command is applied.
  • the size of the interval to be monitored may be determined in advance so that each combination representing bits used for the corresponding purpose in the DCI indicates a specific interval.
  • the size of the monitoring interval that can be expressed may be 2 M in total.
  • the size of M may be specified through a higher layer signal such as an SIB or RRC signal. At this time, if the maximum usable size of M is M max , the size of M indicated through a higher layer signal may be a value between 1 and M max .
  • M max -M bits can be used for other purposes or represented as a fixed value. If a flag indicating whether to wake up or go to sleep is used, the size of M max and / or M may vary depending on the information expressed by the flag. In addition, the information represented by the combination of bits used and the size of the interval for monitoring the NPDCCH corresponding thereto may vary depending on the information represented by the flag.
  • the information included in the DCI coordinates the DRX cycle, the information may be for performing dynamic DRX control for each wireless device or group of wireless devices. If P bits are used for adjusting DRX cycles, 2 P DRX cycle operations are possible.
  • Table 3 shows an example of determining the constant used to adjust the DRX cycle when two bits are used for adjusting the DRX cycle.
  • c DRX value is a constant that adjusts the DRX cycle
  • an N-bit payload may be added and encoded in addition to the DCI bit.
  • CRC may be used as the payload added at this time.
  • an 8-bit CRC may be used in the NB-IoT.
  • the purpose of the present invention may be to reduce the number of bits required to configure the WUS in order to reduce power consumption for the WUS as compared with the NPDCCH to which the WUS exists.
  • the RNTI value may be used for CRC masking to inform that the corresponding DCI is the purpose of the WUS.
  • the WUS may be determined based on an arbitrary bit pattern associated with a cell ID or configured from a base station for the purpose of identifying a cell to which a WUS is transmitted.
  • the added load may use RNTI or bit information (for example, a value calculated based on a cell ID or an arbitrary bit pattern set from a base station) used for distinguishing cells. This may be for the purpose of delivering information to a wireless device or a group of wireless devices that need the WUS instead of using an unnecessary length of CRC to prevent an increase in overall overhead when the DCI is short.
  • the DCI size of the WUS may be determined to have the same size as the NPDCCH to which the WUS exists.
  • the target NPDCCH and the physical channel for WUS can be distinguished through RNTI.
  • the occurrence interval in which the WUS is monitored may be determined to share the same location as the NPDCCH to which the WUS exists.
  • the index of the wireless device group and the section in which the go to sleep proceeds are specified in DCI information. It can be used, which can be used for the purpose of supporting dynamic DRX setup.
  • WUS's DCI can indicate only those search spaces that wireless devices need to monitor in the future, or only those search spaces that do not need to be monitored. According to this, power consumption can be reduced compared to the existing wireless device has to monitor all the search space.
  • the DCI of the WUS may indicate a DRX change. If you change the DRX cycle to increase through the DCI of WUS, power consumption may be reduced. VIII-3. Third Scheme of the Eighth Disclosure: Two Steps of WUS
  • This section describes how to support two levels of wake up (or go to sleep) by combining physical signals and physical channels.
  • the physical channel may be used for the purpose of indicating whether there is information related to wake up (or go to sleep). If the wireless device detects a physical signal corresponding to itself, the next step may be to monitor the physical channel associated with the WUS.
  • the physical signal may use the contents of the scheme and information described in the first scheme of the eighth time.
  • information transmitted through the physical signal may be minimized in order to reduce power consumption or delay occurring in the process of monitoring the physical signal and to increase accuracy. For example, the information may indicate whether the physical channel is transmitted. Only 1 bit indication information may be used.
  • the information expressed through the corresponding physical signal may include information for distinguishing operations of wake up and go to sleep. In this case, if more than one sequence is used for the physical signal, each sequence may be divided and used for the purpose of expressing a group of wireless devices or a cell ID.
  • the physical channel may be used for the purpose of informing detailed information related to wake up (or go to sleep).
  • the generation of the corresponding physical channel may use the methods mentioned in the second scheme of the eighth disclosure.
  • a combination of two levels of wake up may be configured by a combination of two physical signals.
  • the first physical signal may be for providing downlink time synchronization
  • the second physical signal may be for transmitting information.
  • the first physical signal may be a modified form of PSS (or NPSS)
  • the second physical signal may be a modified form of SSS (or NSSS).
  • the first physical signal can be determined to always transmit without providing information. This may be for the purpose of always supporting the operation of downlink synchronization even if there is no indication of the actual wake up operation.
  • the first physical signal may provide information of wake up or go to sleep. If there is a signal, it informs wake up and informs go to sleep using the DTX method, or distinguishes wake up and go to sleep by using a different sequence configuration method.
  • the first physical signal may be represented by a sequence distinguished by cell ID. This may be for the purpose of preventing malfunction due to a physical signal transmitted from an adjacent cell.
  • the information provided by the second physical signal may be information about a cell ID, a wireless device (or group) ID, and / or an NPDCCH generation interval.
  • the information on the NPDCCH monitoring interval may be information such as a location, number, or period in which the NPDCCH is set.
  • the two physical signals constituting the two levels of wake up (or go to sleep) may each be enabled / disabled separately. For example, whether the operation is performed through the 1-bit indication may be determined through higher layer signals such as SIB or RRC signals.
  • the terminal may determine the downlink time synchronization acquisition method and the type and amount of information received through the physical signal based on the information of the physical signal received from the base station.
  • the cover code may be applied in a unit in which a physical signal is repeated. For example, when a physical signal of a subframe unit is applied, the cover code may be applied at the subframe level. This may be aimed at lowering the detection complexity of the physical signal and maintaining the characteristics of the sequence.
  • the cover code applied may be specified to be initialized, from the start subframe of the physical signal.
  • the cover code may be generated by a random number generated from the subframe index.
  • Embodiments of the present invention described so far may be implemented through various means.
  • embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof. Specifically, it will be described with reference to the drawings.
  • 19 is a block diagram illustrating a wireless device and a base station in which the present disclosure is implemented.
  • the wireless device 100 and the base station 200 may implement the disclosure herein.
  • the illustrated wireless device 100 includes a processor 101, a memory 102, and a transceiver 103.
  • the base station 200 shown likewise includes a processor 201, a memory 202, and a transceiver 203.
  • the illustrated processor 101, 201, memory 102, 202, and transceiver 103, 203 may be implemented as separate chips, or at least two blocks / functions may be implemented through one chip.
  • the transceivers 103 and 203 include a transmitter and a receiver. When a specific operation is performed, only one of the transmitter and the receiver may be performed, or both the transmitter and the receiver may be performed.
  • the transceivers 103 and 203 may include one or more antennas for transmitting and / or receiving wireless signals.
  • the transceivers 103 and 203 may include amplifiers for amplifying received and / or transmitted signals and bandpass filters for transmission over a particular frequency band.
  • the processors 101 and 201 may implement the functions, processes, and / or methods proposed herein.
  • the processors 101 and 201 may include an encoder and a decoder.
  • the processors 101 and 202 may perform operations according to the above description.
  • Such processors 101 and 201 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, data processing devices, and / or converters that convert baseband signals and wireless signals to and from each other.
  • ASICs application-specific integrated circuits
  • the memories 102 and 202 may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media and / or other storage devices.
  • ROM read-only memory
  • RAM random access memory
  • flash memory memory cards
  • storage media storage media and / or other storage devices.
  • FIG. 20 is a detailed block diagram of a transceiver of the wireless device shown in FIG. 19.
  • the transceiver 110 includes a transmitter 111 and a receiver 112.
  • the transmitter 111 includes a discrete fourier transform (DFT) unit 1111, a subcarrier mapper 1112, an IFFT unit 1113, a CP insertion unit 1144, and a wireless transmitter 1115.
  • the transmitter 111 may further include a modulator.
  • the apparatus may further include a scramble unit (not shown), a modulation mapper (not shown), a layer mapper (not shown) and a layer permutator (not shown). It may be disposed before the DFT unit 1111.
  • the transmitter 111 first passes the information through the DFT 1111 before mapping a signal to a subcarrier. After subcarrier mapping of the signal spread (or precoded in the same sense) by the DFT unit 1111 through the subcarrier mapper 1112, the inverse fast fourier transform (IFFT) unit 1113 is passed on the time axis. Make it a signal.
  • IFFT inverse fast fourier transform
  • the DFT unit 1111 outputs complex-valued symbols by performing a DFT on the input symbols. For example, when Ntx symbols are input (where Ntx is a natural number), the DFT size is Ntx.
  • the DFT unit 1111 may be called a transform precoder.
  • the subcarrier mapper 1112 maps the complex symbols to each subcarrier in the frequency domain. The complex symbols may be mapped to resource elements corresponding to resource blocks allocated for data transmission.
  • the subcarrier mapper 1112 may be called a resource element mapper.
  • the IFFT unit 1113 performs an IFFT on the input symbol and outputs a baseband signal for data, which is a time domain signal.
  • the CP inserter 1114 copies a part of the rear part of the base band signal for data and inserts it in the front part of the base band signal for data.
  • ISI Inter-symbol interference
  • ICI inter-carrier interference
  • the receiver 112 includes a wireless receiver 1121, a CP remover 1122, an FFT unit 1123, an equalizer 1124, and the like.
  • the radio receiver 1121, the CP remover 1122, and the FFT unit 1123 of the receiver 112 include a radio transmitter 1115, a CP insertion unit 1114, and an IFF unit 1113 at the transmitter 111. Performs the reverse function of The receiver 112 may further include a demodulator.

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  • Mobile Radio Communication Systems (AREA)

Abstract

Un mode de réalisation de la présente invention concerne un procédé permettant à un dispositif sans fil de recevoir un message de radiomessagerie. Le procédé peut comprendre : une étape de spécification d'une fenêtre d'occasion de signal de réveil (WUSO) pour une tentative de réception d'un signal de réveil (WUS) ; et une étape de surveillance d'un canal de commande de liaison descendante durant une fenêtre de radiomessagerie de sorte à tenter de recevoir un message de radiomessagerie, si le WUS est reçu à l'intérieur de la fenêtre de WUSO spécifiée. Selon l'invention, la durée temporelle et un décalage temporel de la fenêtre de WUSO peuvent être spécifiés.
PCT/KR2018/003435 2017-03-24 2018-03-23 Procédé et dispositif sans fil pour recevoir un message de radiomessagerie Ceased WO2018174635A1 (fr)

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JP2019528879A JP6882475B2 (ja) 2017-03-24 2018-03-23 ページングメッセージを受信する方法及び無線機器
CN202111175968.4A CN113891437B (zh) 2017-03-24 2018-03-23 用于接收寻呼消息的方法和无线设备
CN202110984002.9A CN113873621B (zh) 2017-03-24 2018-03-23 用于接收寻呼消息的方法和无线设备
EP21206576.7A EP3968709B1 (fr) 2017-03-24 2018-03-23 Procédé et dispositif sans fil permettant de recevoir un message de radiomessagerie
EP18771456.3A EP3509368A4 (fr) 2017-03-24 2018-03-23 Procédé et dispositif sans fil pour recevoir un message de radiomessagerie
CN201880004110.1A CN109923914B (zh) 2017-03-24 2018-03-23 用于接收寻呼消息的方法和无线设备
US16/379,288 US10904861B2 (en) 2017-03-24 2019-04-09 Method and wireless device for receiving paging message
US17/129,301 US11818685B2 (en) 2017-03-24 2020-12-21 Performing discontinuous reception (DRX) operation based on downlink control information (DCI)
US18/377,489 US12120639B2 (en) 2017-03-24 2023-10-06 Performing discontinuous reception (DRX) operation based on downlink control information (DCI)
US18/882,393 US20250008487A1 (en) 2017-03-24 2024-09-11 Performing discontinuous reception (drx) operation based on downlink control information (dci)

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US201762475879P 2017-03-24 2017-03-24
US62/475,879 2017-03-24
US201762491303P 2017-04-28 2017-04-28
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US62/491,300 2017-04-28
US62/491,303 2017-04-28
US201762520555P 2017-06-16 2017-06-16
US201762520557P 2017-06-16 2017-06-16
US62/520,557 2017-06-16
US62/520,555 2017-06-16
US201762565080P 2017-09-28 2017-09-28
US201762565082P 2017-09-28 2017-09-28
US62/565,080 2017-09-28
US62/565,082 2017-09-28
US201762568813P 2017-10-06 2017-10-06
US62/568,813 2017-10-06
US201762586210P 2017-11-15 2017-11-15
US62/586,210 2017-11-15
KR10-2018-0033509 2018-03-22
KR1020180033509A KR20180121350A (ko) 2017-04-28 2018-03-22 페이징 메시지를 수신하는 방법 및 무선 기기

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