WO2018084642A1 - Procédé et appareil de détermination d'une défaillance de liaison radio - Google Patents

Procédé et appareil de détermination d'une défaillance de liaison radio Download PDF

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Publication number
WO2018084642A1
WO2018084642A1 PCT/KR2017/012425 KR2017012425W WO2018084642A1 WO 2018084642 A1 WO2018084642 A1 WO 2018084642A1 KR 2017012425 W KR2017012425 W KR 2017012425W WO 2018084642 A1 WO2018084642 A1 WO 2018084642A1
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WIPO (PCT)
Prior art keywords
oos
indication
timer
change
beams
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PCT/KR2017/012425
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English (en)
Korean (ko)
Inventor
황준
강현정
권상욱
목영중
문정민
아닐에기월
정병훈
Original Assignee
삼성전자 주식회사
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.)
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Priority claimed from KR1020170019388A external-priority patent/KR20180049772A/ko
Application filed by 삼성전자 주식회사 filed Critical 삼성전자 주식회사
Priority to US16/347,511 priority Critical patent/US11006389B2/en
Priority to KR1020197012734A priority patent/KR102501079B1/ko
Priority to KR1020237005206A priority patent/KR20230027324A/ko
Publication of WO2018084642A1 publication Critical patent/WO2018084642A1/fr
Priority to US17/230,865 priority patent/US11902938B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/318—Received signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0408—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more beams, i.e. beam diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0868—Hybrid systems, i.e. switching and combining
    • H04B7/088—Hybrid systems, i.e. switching and combining using beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

Definitions

  • the present invention relates to a wireless communication system, and more particularly, to a method and apparatus for determining a radio link failure in a system using a plurality of beams.
  • a 5G communication system or a pre-5G communication system is called a system after a 4G network or a system after a post LTE system.
  • 5G communication systems are being considered for implementation in the ultra-high frequency (mmWave) band (eg, such as the 60 Gigabit (60 GHz) band).
  • mmWave ultra-high frequency
  • FMI massive array multiple input / output
  • FD-MIMO full-dimensional multiple input / output
  • array antenna are used to reduce the path loss of radio waves and increase the transmission distance of radio waves in the ultra high frequency band.
  • 5G communication system has evolved small cell, advanced small cell, cloud RAN, ultra-dense network, and device-to-device communication. technologies such as device to device communication (D2D), wireless backhaul, moving network, cooperative communication, coordinated multi-points and interference cancellation It is done.
  • D2D device to device communication
  • SWSC sliding window superposition coding
  • FBMC filter bank multi carrier
  • NOMA advanced coding modulation
  • IoT Internet of Things
  • M2M machine to machine
  • MTC machine type communication
  • 5G communication system to the IoT network.
  • sensor networks, things communication, MTC, and the like are 5G communication technologies implemented by techniques such as beamforming, MIMO, and array antennas.
  • cloud radio access network as the big data processing technology described above may be an example of convergence of 5G technology and IoT technology.
  • the 5G system considers support for various services compared to the existing 4G system.
  • the most representative services are enhanced mobile broad band (eMBB), ultra-reliable and low latency communication (URLLC), and massive machine type (massive machine type). communication, mMTC), and evolved multimedia broadcast / multicast service (eMBMS).
  • eMBB enhanced mobile broad band
  • URLLC ultra-reliable and low latency communication
  • mMTC massive machine type
  • eMBMS evolved multimedia broadcast / multicast service
  • the system providing the URLLC service may be referred to as a URLLC system and the system providing the eMBB service as an eMBB system.
  • the terms service and system may be used interchangeably.
  • one cell may have multiple beams.
  • beamforming techniques may be applied.
  • the UE declares the RLF in units of cells without declaring a radio link failure (RLF) in units of beams. Therefore, in the system using multiple beams, a radio connection failure declaration and its related operation considering the beamforming operation should be newly designed.
  • RLF radio link failure
  • the present invention provides a new method for declaring radio link failure (RLF) in a system using multiple beams.
  • RLF radio link failure
  • a method for determining radio link failure includes identifying an indication of out of synchronization (OOS) or in synchronization (IS) for a plurality of receive beams, if the indication of the OOS is identified, starting a timer to determine an RLF, and the plurality of If a change is required for at least one of the received beams of a, holding the timer.
  • OOS out of synchronization
  • IS in synchronization
  • a terminal in a wireless communication system includes a transceiver for transmitting and receiving a signal to and from the base station, and a controller connected to the transceiver.
  • the controller is further configured to identify an indication of out of synchronization (OOS) or in synchronization (IS) for a plurality of receive beams, and to determine a radio link failure (RLF) if the indication of the OOS is identified. And to hold the timer if a change to at least one of the plurality of receive beams is requested.
  • OOS out of synchronization
  • IS in synchronization
  • RLF radio link failure
  • a cell without unnecessarily long waiting to determine a radio connection failure or declaring a radio connection failure too quickly, The connection can be resumed at a suitable time.
  • FIG. 1 illustrates a case of performing an RLF determination based on a serving beam.
  • FIG 2 illustrates a case in which an RLF determination is performed based on a beam with the best received signal.
  • FIG. 3 illustrates a case of performing an RLF determination based on a representative value of a plurality of beams.
  • the physical layer sends an indication for each beam and the RRC determines an RLF based on the indication for each beam.
  • FIG. 5 shows a case of holding an OOS timer during an SR based beam change procedure.
  • FIG. 6 illustrates a case in which the measurement result of the existing serving beam is continuously reflected during the beam changing procedure of FIG. 5.
  • FIG. 7 illustrates a case of holding an OOS timer during an RA based beam change procedure.
  • FIG. 8 illustrates a case in which the measurement result of the existing serving beam is continuously reflected during the beam changing procedure of FIG. 7.
  • FIG. 10 illustrates a case in which the time point at which the beam change operation is started is earlier than the start time point of the OOS timer.
  • 11 is an example of measurement in the case of using BRS.
  • 15 is a diagram showing the structure of a terminal according to an embodiment of the present invention.
  • the physical layer receives a command of radio resource control (RRC) or selects beams using a predetermined implementation value.
  • RRC radio resource control
  • the physical layer performs measurements using the selected beams, generates one or a plurality of representative values according to a specific calculation method, and sends an indication to the RRC layer.
  • the indication means a Boolean expression called out of sync. (OOS) or in sync.
  • a problem of a physical layer should be identified.
  • one beam or a plurality of beams may be considered.
  • the serving beam agreed by the terminal and the base station may be considered, and the best beam among several beams measured by the terminal may be considered.
  • the beam measurement referred to in the present invention may be performed based on a beam specific reference signal.
  • a reference signal RS allocated to a specific sector may be used.
  • the beam itself may be the meaning of the sector.
  • the measurement signal may mean a non-UE based RS, and may have a specific period or may be scheduled and radiated from an antenna using an analog beamforming vector or a digital beamforming vector.
  • cell specific RS, beam specific RS, demodulation RS (DM RS), channel state information RS (CSI-RS), or the like may be used as the measurement signal.
  • the serving beam refers to a beam determined by the terminal and the base station as the serving beam.
  • the physical layer measures the reception intensity of the beam and generates an indication of OOS if the average value of the reception intensity falls below a given value for a certain time, and otherwise generates an indication of IS.
  • the physical layer may generate an indication of the IS if the average value of the received intensity for a particular time is above a given value, or otherwise generate an indication of the OOS.
  • the physical layer may also measure the reception strength of other beams, but may not generate a history value.
  • the physical layer recognizes the changed beam and performs averaging while maintaining a history of the measured values, so that it can be used to determine link failure.
  • the RCC When the physical layer sends an indication of the IS or OOS to the RRC layer, the RCC finally declares a radio connection failure considering the number of consecutive repetitions given in advance for each event and the time at which the indication is sent. For example, if the OOS indication is repeated a certain number of times, the RRC starts the timer and stops the timer if the indication of IS is received at least once while the timer is running. If the timer expires, the RRC declares a radio link failure. Meanwhile, as a factor of stopping the timer, it may be considered that the serving beam is changed due to the beam tracking operation. If the serving beam changes, the RRC may initialize the timer and start the timer again based on the OOS indication of the new serving beam.
  • IS and OOS may be further generated depending on the newly changed serving beam's measurement state, regardless of the serving beam change.
  • the RRC may maintain the timer but stop the timer due to the occurrence of an indication of the IS due to the newly changed beam.
  • FIG 2 illustrates a case in which an RLF determination is performed based on a beam with the best received signal.
  • the UE periodically performs the measurement on the beams and selects an optimal beam based on the measured values. All measured beams can be candidates for the optimal beam.
  • the candidate of the optimal beam may be limited to a specific beam, such as a beam of a serving cell or a beam of a specific TRP, such as a serving transmission / reception point (TRP).
  • the optimal beam may be determined as the beam having the strongest reception intensity by comparing the measured values of all the beams during a specific measurement period (which may be from 1 to a certain integer period). In the case of an integer period greater than 1, an optimal beam may be selected by calculating an average of reception strengths for each beam during the period. If the period is 1, the optimal beam may be changed for each period. Alternatively, the optimal beam may be defined as a beam having the strongest reception intensity by comparing values of beams measured from a current time to a specific time through a time window rather than a measurement period. If a time window is used, the time represented by the time window continues to vary with respect to the current time, so the optimal beam may also change.
  • the physical layer may determine the IS or OOS based on the history of the optimal beam value (values of the changed beams if changed).
  • the optimal beam may continue to vary, but averaging may be performed on the history of the values of the changing beam.
  • the history means accumulated values.
  • the physical layer generates an indication of OOS if the average reception intensity for a certain time is less than or equal to a predetermined value, and otherwise generates an indication of IS.
  • the physical layer generates an indication of IS if the average received strength is above a predetermined value, or otherwise generates an indication of OOS.
  • the RCC When the physical layer sends an indication of the IS or OOS to the RRC layer, the RCC finally declares a radio connection failure considering the number of consecutive repetitions given in advance for each event and the time at which the indication is sent. For example, if the OOS indication is repeated a certain number of times, the RRC starts the timer and stops the timer if the indication of IS is received at least once while the timer is running. If the timer expires, the RRC declares a radio link failure.
  • the beam can request a beam change.
  • the UE may request to change the serving beam through a scheduling request or random access, or may search for and attach a new cell.
  • FIG. 3 illustrates a case of performing an RLF determination based on a representative value of a plurality of beams.
  • the plurality of beams may be all of beams capable of knowing the beam's identity and may be measured, or some of the beams may be selected as the plurality of beams by a specific classification.
  • a beam of a specific cell such as a serving cell
  • a beam of a specific TRP such as a serving TRP
  • the physical layer sends an OOS or IS indication to the RRC using the representative value and a predetermined OOS threshold or IS threshold. That is, the physical layer generates an indication of OOS if the representative value is less than or equal to a predetermined value (ie, an OOS threshold), and otherwise generates an indication of IS. Alternatively, the physical layer generates an indication of the IS if the representative value is above a predetermined value (ie, the IS threshold), and otherwise generates an indication of the OOS.
  • the RCC When the physical layer sends an indication of the IS or OOS to the RRC layer, the RCC finally declares a radio connection failure considering the number of consecutive repetitions given in advance for each event and the time at which the indication is sent. For example, if the OOS indication is repeated a certain number of times, the RRC starts the timer and stops the timer if the indication of IS is received at least once while the timer is running. If the timer expires, the RRC declares a radio link failure.
  • the UE finds another cell or TRP or performs a cell (re) selection procedure to establish the RRC connection.
  • the physical layer sends an indication for each beam and the RRC determines the RLF
  • the physical layer sends an indication for each beam and the RRC determines an RLF based on the indication for each beam.
  • the representative value is not calculated based on the measured values of the plurality of beams as in the embodiment of FIG. 3, but the physical layer averages the measured values of the specific beams and OOS or IS for the corresponding beams. Is determined and an indication of OOS or IS is sent to the RRC.
  • the RRC receives an indication of OOS or IS for a plurality of beams for a certain time from the physical layer, it determines whether or not to declare an RLF based on the indication.
  • the RRC may start a timer upon receiving one or more consecutive OOS indications of a particular beam, and may declare an RLF if one or more indications of the IS are not received until the timer expires.
  • a timer is started when an indication of OOS is received from a plurality of specific beams, and a timer is stopped when an indication of IS is received for one of the beams. If no indication of IS is received for one beam and the timer expires, the RRC may declare an RLF.
  • the physical layer may send the ID of the corresponding beam to the RRC along with the IS or OOS indication.
  • the terminal may have a representative beam or serving beam for a specific TRP when measuring the beam of a plurality of TRP.
  • the terminal may declare the RLF. If a good signal is maintained without receiving an OOS indication for a representative beam or serving beam of a specific TRP among the various TRPs under consideration, the UE may not declare an RLF even if an OOS indication is received for the remaining beams. Instead of declaring an RLF, a procedure may be performed to change the beam of TRP in a bad state. For example, the terminal may transmit a change request signal for changing the beam of the TRP in the bad state to the beam of the TRP in the good state.
  • the terminal is connected to a plurality of cells (Pcell or pScell).
  • cells 1 and 2 may each have a plurality of TRPs constituting the cell.
  • the network may inform the terminal in advance of the information on the beam or TRP ID that the TRP has.
  • the terminal may find out which beam belongs to a cell to which the terminal intends to connect through the information.
  • the physical layer may generate an indication of OOS or IS for a specific beam or serving beam among beams of the corresponding cell or TRP by the above-described method.
  • the physical layer may send the TRC information or cell information of the beam in which the OOS or the IS occurred with the indication of the OOS or the IS to the RRC.
  • the physical layer may pass a cell ID or separator to the RRC with an indication of OOS or IS. If an indication of OOS is delivered from all cells and does not receive an IS for longer than a predetermined timer value, the RRC may declare an RLF. Alternatively, if a particular cell receives OOS and does not receive an IS for longer than the value of a predetermined timer, the RRC may declare and release the RLF only for that cell and perform a procedure to find the cell again. Can be.
  • NR new radio
  • NR new radio
  • the terminal may request a scheduling request (SR) or a random access (RA). It may be performed to inform the serving cell or another cell to find a new serving beam.
  • SR scheduling request
  • RA random access
  • an indication of an SR failure or an RA failure may be provided in a media access control (MAC) layer.
  • MAC media access control
  • an RLF may be declared if a desired UL (uplink) resource is not allocated while performing a specific number of SRs.
  • the UL resource is not acquired for a specific time from the time point at which the SR for beam change is transmitted, it may be considered as an SR failure.
  • the RLF may be declared even if the UL resource for delivering the indication of the beam change is not obtained. Even if a UL resource is not acquired for a specific time from the time when the RA for beam change is started, it may be considered as an RA failure.
  • layer 2 may declare an RLF.
  • beam change may mean beam recovery or beam replacement.
  • CA carrier aggregation
  • CC component carrier
  • the physical layer timer for the RRC to declare the RLF starts to work.
  • the timer is called an OOS timer or RLF timer.
  • RRC declares RLF.
  • the present invention proposes to hold the operation of a timer while the operation is performed if there is an operation of layer 1 or layer 2 that performs beam change during beam management. This is because the beam change operation takes time, so that the time is excluded from the estimation time of the bad channel.
  • FIG. 5 shows a case of holding an OOS timer during an SR based beam change procedure.
  • the UE performs measurement on a serving beam, and when a beam failure occurs, transmits a dedicated SR preamble for beam change to a base station, receives a UL grant from the base station, and the UL grant. And transmits beam state information (BSI) feedback to the base station, receives a beam change indication from the base station, and transmits an acknowledgment (ACK) to the indication.
  • BSI beam state information
  • ACK acknowledgment
  • the terminal performs measurement on the changed serving beam at a predetermined time after the serving beam is changed. Meanwhile, the UE may perform measurement on other beams together with the measurement on the serving beam.
  • the physical layer sends an indication of OOS to the RRC.
  • the physical layer may send an indication of a given number of consecutive OOSs.
  • the RRC starts an OOS timer upon receiving an indication of OOS from the physical layer.
  • the MAC (or physical layer) signals a request for beam change when initiating beam change.
  • the MAC may transmit a request for beam change at the time of transmitting a dedicated SR for beam change.
  • the OOS timer is held from the SR transmission time until the beam change is completed.
  • the physical layer or MAC layer sends an indication to the RRC to change the beam.
  • the held timer is resumed. Resuming means restarting the counter counting from the held value or resetting the held value to the default value and then restarting (recounting) the timer. If OOS occurs by taking measurements on the modified serving beam, the timer continues. If the timer then expires, the RRC declares an RLF. The timer is stopped when IS occurs for the modified serving beam. Stopping means that the timer in progress ends and resets the timer's value to its default value. As described above, when a problem occurs in the SR-based beam change process, the RRC may immediately declare the RLF without waiting for the expiration of the timer.
  • the timer immediately restarts (if the measurement result of the changed serving beam is OOS) or stops (without changing the serving beam measurement time) The measurement result of the beam is IS).
  • FIG. 6 illustrates a case in which the measurement result of the existing serving beam is continuously reflected during the beam changing procedure of FIG. 5.
  • the timer starts when the OOS indication for the serving beam is received, and then the timer is held when the beam change procedure proceeds. Meanwhile, according to the embodiment of FIG. 6, even when the timer is being held, if the measurement result of the existing serving beam means IS, the timer is no longer held and is stopped. If the measurement result of the existing serving beam means OOS, the timer remains in the holding state.
  • the timer is not activated if the physical layer sends an indication of IS for the changed serving beam after the beam change procedure is completed.
  • the timer restarts when the physical layer sends an indication of OOS for the changed serving beam.
  • timer is not stopped during the beam change procedure. That is, the timer is restarted when the beam changing procedure is completed, and when the indication of OOS is received for the changed serving beam, the timer continues. After that the timer expires, an RLF is declared. The timer is stopped when IS is received for the modified serving beam.
  • the RLF may be declared immediately.
  • the MAC or physical layer may convey an indication of the beam change failure to the RRC.
  • the above operation is possible even in the case of beam feedback through a random access channel (RACH), rather than event driven beam feedback using an SR. That is, while holding the timer and disregarding the beam measurement result during the beam change operation as in the embodiment of FIG. 5, even if the timer is held as in the embodiment of FIG. 6, the beam measurement result is reflected (FIG. 6) or the beam change operation is ignored. It is possible to run a timer.
  • the UE recognizes the failure of the beam change through the RACH, rather than the failure of the beam change through the SR, it can declare the RLF.
  • the MAC or physical layer may convey an indication of the beam change failure to the RRC.
  • the timer operation may be applied based on the event driven beam feedback and the beam changing operation through the RACH.
  • FIG. 7 illustrates a case of holding an OOS timer during an RA based beam change procedure.
  • FIG. 8 illustrates a case in which the measurement result of the existing serving beam is continuously reflected during the beam changing procedure of FIG. 7.
  • FIGS. 7 and 8 correspond to the embodiments of FIGS. 5 and 6 according to event driven beam feedback using SR.
  • the RACH preamble is transmitted to the base station through a physical random access channel (PRACH)
  • a random access response (RAR) for a beam received from the base station is received
  • the BSI feedback is transmitted to the base station through Message 3 (Message 3).
  • Operations for transmitting, receiving beam feedback on the RACH, such as beam change indication or contention resolution from the base station, transmitting an ACK to the indication, and thus changing the beam may use SR.
  • FIGS. 5 and 6 respectively. Descriptions of other operations are omitted because they are the same as the corresponding operations in the embodiment of FIGS. 5 and 6.
  • the above-described beam change related operations may be variously implemented according to the operations designed in the layer 1 and the layer 2.
  • operations for recognizing the change of the beam or the use of the current serving beam and finding a new beam various detailed operations among the embodiments for using SR and using RACH, and the success or failure of beam change are OOS. It can be associated with starting, holding and stopping the timer. That is, the detailed operation of the beam change may be implemented as follows.
  • FIG. 10 illustrates a case in which the time point at which the beam change operation is started is earlier than the start time point of the OOS timer.
  • the start time of the OOS timer may be delayed after the beam change operation. Specifically, after determining whether the new serving beam determined after the beam changing operation is in the OOS or IS state, the OOS timer may be started.
  • OOS timer is configured to start when three indications of OOS occur in succession, and the beam changing operation is performed when the intensity of the received beam does not exceed the OOS threshold even once, that is, the indication of OOS It can happen if it is configured to start once it occurs.
  • the beam changing operation is triggered when a specific RS is less than or equal to a predetermined threshold value, and the beam changing operation may be started before the OOS timer even when the specific RS is one of several RSs configured as radio link monitoring (RLM) RSs.
  • RLM radio link monitoring
  • the beam change RS and the RLM RS are different, or when the beam change RS is one of the RLM RSs, it occurs when the beam change RS satisfies the trigger metric and then the RLM RSs generate OSS.
  • the start condition of the beam change operation and the start condition of the OOS timer may be the same, such as when the beam change and the RLM RS are the same or the number of indications of the OOS is the same.
  • the serving beam may be a plurality of beams instead of one beam. If the serving beam is a plurality of beams, the OOS or IS threshold values are compared for each of the plurality of beams. If all beams do not exceed the OOS threshold, the physical layer determines the serving beam as OOS and sends an indication of OOS to the RRC. The serving beam is determined to be IS if all beams exceed the IS threshold or if at least one beam exceeds the IS threshold. If some of the plurality of beams do not exceed the threshold of the OOS, the beam change is performed using the beam beyond the threshold of the OOS. In the above-described embodiment of FIGS.
  • the OOS timer when the serving beam is a plurality of beams, the OOS timer may be started when all the beams do not exceed the OOS threshold.
  • OOS or IS indication in other operations of beam change may be applied in place of OOS determination or IS determination for the plurality of beams described above.
  • the OOS timer is operated by implicitly considering a specific operation as an operation for changing a beam.
  • a timer that is, a beam change timer
  • the beam change timer may be used together with the OOS timer.
  • the beam change procedure is started, the beam change timer is started and the OOS timer is held.
  • the beam change timer is stopped and the OOS timer is resumed. If the status of the modified serving beam is better than the IS threshold, the OOS timer is also stopped. If the IS indication is identified for the serving beam during the beam change operation, the change operation and the beam change timer may be stopped.
  • An element of layer 2 that declares an RLF may declare an RLF regardless of the OOS timer when the beam change timer expires.
  • the physical layer may not send an OOS indication for the serving beam. Accordingly, the OOS timer operated by RRC may not be started.
  • the change operation ends or the change timer stops or expires, if the quality of the changed serving beam is examined and corresponds to OOS, the physical layer sends an OOS indication to the RRC, and the RRC may restart or resume the OOS timer.
  • the UE may request a change of the serving beam after the RLF declaration.
  • a new cell or TRP may be found and network reconnection may be performed.
  • the UE may use the SR or RACH preamble to request the beam change. That is, the UE may request beam change by using a dedicated SR or RACH preamble for beam change, or may transmit an indication of beam change or TRP change through the uplink channel by using the corresponding beam when another valid beam exists.
  • the operation of finding a new cell refers to a series of processes of finding a synchronization signal of available frequency, measuring the signal, and reconnecting through a RA to a cell having a sufficiently strong signal.
  • the terminal may transmit an indication indicating the replacement of the serving beam to the base station through a MAC control element (SR), SR or RACH.
  • SR MAC control element
  • a criterion in which the beam changing operation is triggered may be that a state in which the intensity of the serving beam falls below the OOS threshold value for a specific time period is continued for a predetermined number of times or more. If there are other additional conditions, such as other beams that are in a better state than the serving beam, a condition may be used in which the beam changing operation is performed without generating an OOS indication and the operation associated with the OOS timer does not start.
  • the physical layer examines the quality of the changed serving beam to determine the state of the serving beam is OOS or IS, and generates an OOS indication if the changed serving beam is in the state of OOS.
  • the RRC starts an OOC timer.
  • the threshold Q out for OOS is a downlink radio with a hypothetical block error rate of less than or equal to Z% of the control channel (e.g., physical downlink control channel (PDCCH)), taking into account predefined transmission parameters and acceptable errors. Means quality.
  • the control channel may be present in the subbeam beam. For a plurality of serving beams, an OOS indication is generated if all serving beams do not exceed the OOS threshold Q out .
  • the threshold Q in for the IS means downlink radio quality in which the virtual block error rate of the control channel (eg, PDCCH) has a value equal to X% in consideration of a predefined transmission parameter and an acceptable error.
  • the control channel may be present in the serving beam.
  • an IS indication is generated if at least one serving beam exceeds the IS threshold Q in .
  • the values of Z and Q can be determined by implementation. In addition, if there is no channel considering the error, the error may not be considered.
  • the threshold value may be represented by a reference signal received power (RSRQ), a reference signal received quality (RSRP), or a received signal strength indicator (RSSI).
  • IS or OOS is determined by measuring the received power of a beam measurement reference signal (BRS), CSI-RS, DM RS or cell specific RS and comparing the measured value with a threshold value.
  • the RS may be transmitted in a specific beam of a serving beam or a plurality of beams. Alternatively, the entire plurality of beams may be compared with a threshold value.
  • the object of such an RLM may be one of the above-described methods.
  • the term wise linear combination of the calculation methods A to H described below is Not applicable In this case, instead of applying the linearity of terms in the corresponding time window, the method of A to D is applied, so that all collected measurement values are used as a separate calculation source from the terms.
  • a schedule beam synchronized with the base station eNB may be considered as the measurement Tx beam. That is, the UE and the base station may determine a beam for transmitting data and control information transmitted to the terminal based on the measurement.
  • the beam measured for the RLF determination may be determined as the beam that is synchronized with the network, and the terminal always tracks the beam to perform beam measurement.
  • the beam measurement is performed based on the schedule beam, but the reception Rx beam uses a beam preferred by the UE.
  • OOS / IS is determined based on the measurement of RS with the corresponding schedule Tx beam and Rx beam.
  • the BRS measurement value in the time slot corresponding to the schedule beam ID in regularly distributed BRS slots is basically used as the source of the RS.
  • the RS in the scheduled time slot (subframe) can optionally be measured.
  • a method of converting a threshold value for determining OOS or IS may be needed between the measured value of the BRS and the RS measured value of the schedule beam.
  • the measured values of the beams may be divided by the number of beams, or the accumulated measured values of the beams may be divided by the number of beams and the number or times of measurement. That is, an averaging operation for calculating one beam intensity per unit time or unit measurement number may be performed.
  • the representative value of the multiple beams is calculated based on the beam reference signal, the common reference signal, or the CSI-RS of the corresponding beams.
  • the RS of the measurement slot, the RS of the scheduled beam, or the DM RS carried in the PDCCH are all possible, and each measurement value may be considered together.
  • the BRS is a measurement RS loaded on an analog beam, and two or more analog beams disjoint to cover a cell to serve one cell.
  • a reference signal transmitted in this manner and used for measuring RSRP, RSRQ, or RSSI may be defined as BRS.
  • the following measurement slots can be considered.
  • the eNB TX includes the BRS for each beam in the beam sweeping slot and transmits the same, and sequentially sweeps the beams. While one eNB sweeps TX, the RX receives in a specific beam and measures the BRS. Other cases are possible. For example, if eNB TX repeatedly transmits a BRS on the same beam, the UE RX beam may sweep. This method is applicable to both the source modification of all RSs proposed in the present invention and the case of IS determination. In any case, the term that all combinations of TX beams and RX beams can measure is referred to as term 1, and the specific time T referred to below may be a plurality of terms.
  • 11 is an example of measurement in the case of using BRS.
  • N optimal measured values of the measured values of all measured TX-RX beam pairs irrespective of the beam for a specific time period are the threshold values.
  • the optimal measured value is less than the OOS threshold
  • each TX average (or linear combined value) is treated as a different value, which means that N optimal values are lower than the OOS threshold based on the corresponding calculated value of the entire TX.
  • M may be given or may be selected for each UE based on a specific metric.
  • RS resource location information must already be shared with the scheduled TX beam.
  • the measured value of the additionally scheduled beam is further added as a sample.
  • the rest of the methods apply (1.A, ⁇ H) as above. Since the measurement of the scheduled TX beam and the received RX beam at that time was added in case 1, the measurement result of the BRS measurement was added by adding the measured values of the corresponding TX-RX beam pair added to each calculation.
  • the IS determines, if the specific number of optimal measured values is higher than the specific threshold, compared to the case of the OOS. That is, the measurement source can be used when measuring the RS of the measurement slot as in the case of OOS determination, when measuring the RS of the scheduled beam, when measuring the DMRS carried on the PDCCH, each of the measured values together Can be considered. In this situation, the measurement slot as shown in FIG. 12 may be considered.
  • FIG. 12 includes BRS transmission for each eNB TX beam, the UE receives the RX beam as one beam while sweeping the eNB TX beam. However, multiple UE RX beams may be swept when the same TX beam is repeatedly transmitted.
  • the term that can be measured by the combination of all TX beams and RX beams is regarded as term 1, and the specific time T referred to below may be a plurality of terms.
  • the method of calculating the detection metric is as follows.
  • N optimal measured values of the measured values of all measured TX-RX beam pairs irrespective of the beam for a specific time period are IS thresholds.
  • the value is larger than the value, that is, the measured value of the TX-RX pair of the term 1 and the measured value of the same TX-RX pair of the term 2 are treated as different, and the values of all the terms of all pairs are reported as individual judgment objects. If the N best measured value is greater than the IS threshold,
  • each TX average (or linear combined value) is treated as a different value, which means that N optimal values are larger than the IS threshold based on the corresponding calculated value of the entire TX.
  • M may be given or may be selected for each UE based on a specific metric.
  • G [Calculation per 1TX-1RX Beam Pair]
  • E this value is larger than the IS threshold when linearly combining the value of the best N beam pair again.
  • M may be given or may be selected for each UE based on a specific metric.
  • the OOS / IS related indication may be periodically transmitted to the upper layer at non-overlapping time units. In this case, if the corresponding event does not occur, the indication may not be sent.
  • the OOS / IS may be displayed in consideration of a time region that is constantly overlapped in the form of a sliding window. That is, when a measurement result of a specific TX-RX beam pair is generated, the above-described methods of 1.A to H may be applied as a value of updating the TX-RX beam pair measurement value that the previous term has. Similarly, if no event occurs, the indication may not be sent to a higher layer.
  • the RLF is determined based on that. This will attempt RA at beam mismatch, so if the beam mismatch occurs too often for a certain time, it can be determined as RLF.
  • the specific RA may be an RA for timing alignment or a beam tracking failure that is not easy for handover.
  • 15 is a diagram showing the structure of a terminal according to an embodiment of the present invention.
  • the terminal may include a transceiver 1510, a controller 1520, and a storage 1530.
  • the controller may be defined as a circuit or application specific integrated circuit or at least one processor.
  • the transceiver 1510 may exchange a signal with another network entity.
  • the transceiver 1510 may receive system information from, for example, a base station, and may receive a synchronization signal or a reference signal.
  • the controller 1520 may control the overall operation of the terminal according to the embodiment proposed by the present invention.
  • the controller 1520 may control a signal flow between blocks to perform an operation according to the flowchart described above.
  • the controller 1520 identifies an indication of OOS or IS for a plurality of receive beams, and if an indication of the OOS is identified, starts a timer to determine an RLF, and at least one of the plurality of receive beams. It may be configured to hold the timer if a change to the beam is requested.
  • the storage unit 1530 may store at least one of information transmitted and received through the transceiver 1510 and information generated through the controller 1520.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne une technique de communication destinée à faire converger une technologie d'IoT avec un système de communication 5G pour prendre en charge un débit de transmission de données supérieur dépassant celui d'un système 4G, et un système associé. La présente invention peut être appliquée à des services intelligents (p. ex. habitation intelligente, bâtiment intelligent, ville intelligente, voiture intelligente ou connectée, soins de santé, enseignement numérique, commerce de détail et services associés à la sécurité et la sûreté, ou similaires) sur la base d'une technologie de communication 5G et d'une technologie liée à l'IoT. La présente invention concerne un procédé de détermination d'une défaillance de liaison radio. Le procédé comporte les étapes consistant à: identifier une indication de synchronisme (EST) ou de non-synchronisme (OOS) par rapport à une pluralité de faisceaux de réception; démarrer une temporisation pour déterminer une défaillance de liaison radio lorsque l'indication d'OOS est identifiée; et suspendre la temporisation lorsqu'il est demandé de changer au moins un faisceau de la pluralité de faisceaux de réception.
PCT/KR2017/012425 2016-11-03 2017-11-03 Procédé et appareil de détermination d'une défaillance de liaison radio WO2018084642A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US16/347,511 US11006389B2 (en) 2016-11-03 2017-11-03 Method and apparatus for determining radio link failure
KR1020197012734A KR102501079B1 (ko) 2016-11-03 2017-11-03 무선 링크 실패를 결정하는 방법 및 장치
KR1020237005206A KR20230027324A (ko) 2016-11-03 2017-11-03 무선 링크 실패를 결정하는 방법 및 장치
US17/230,865 US11902938B2 (en) 2016-11-03 2021-04-14 Method and apparatus for determining radio link failure

Applications Claiming Priority (4)

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KR20160146082 2016-11-03
KR10-2016-0146082 2016-11-03
KR10-2017-0019388 2017-02-13
KR1020170019388A KR20180049772A (ko) 2016-11-03 2017-02-13 DSRC/IEEE 802.11p 와 LTE-V2X 공존을 위한 해결방법

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US16/347,511 A-371-Of-International US11006389B2 (en) 2016-11-03 2017-11-03 Method and apparatus for determining radio link failure
US17/230,865 Continuation US11902938B2 (en) 2016-11-03 2021-04-14 Method and apparatus for determining radio link failure

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