WO2012093875A2 - Procédé d'essai de commande de minimalisation et appareil utilisant celui-ci - Google Patents

Procédé d'essai de commande de minimalisation et appareil utilisant celui-ci Download PDF

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Publication number
WO2012093875A2
WO2012093875A2 PCT/KR2012/000130 KR2012000130W WO2012093875A2 WO 2012093875 A2 WO2012093875 A2 WO 2012093875A2 KR 2012000130 W KR2012000130 W KR 2012000130W WO 2012093875 A2 WO2012093875 A2 WO 2012093875A2
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WIPO (PCT)
Prior art keywords
mdt
mode
slmdt
information
terminal
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PCT/KR2012/000130
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English (en)
Korean (ko)
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WO2012093875A3 (fr
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정명철
권기범
안재현
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주식회사 팬택
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Publication of WO2012093875A2 publication Critical patent/WO2012093875A2/fr
Publication of WO2012093875A3 publication Critical patent/WO2012093875A3/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • 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

Definitions

  • the present invention relates to a wireless communication technology, and more particularly, to an apparatus and method for constructing a driving environment (Minimization Driving Test (MDT)), and performing the MDT.
  • MDT Minimum Driving Test
  • a wireless communication network In order to improve the performance of a wireless communication system, a wireless communication network must always consider throughput, frequency efficiency, mobility, coverage, and enhancement of multimedia broadcast / multimedia service (MBMS). As wireless communication technologies have evolved, factors affecting wireless communication networks have also changed significantly.
  • MBMS multimedia broadcast / multimedia service
  • wireless communication systems generally use one bandwidth for data transmission, but vary in bandwidth for each mobile generation.
  • the second generation wireless communication system uses a bandwidth of 200KHz ⁇ 1.25MHz
  • the third generation wireless communication system uses a bandwidth of 5MHz ⁇ 10MHz.
  • LTE Long Term Evolution
  • 3GPP 3rd Generation Partnership Project
  • a service provider In order to operate an effective mobile communication system, a service provider must consider various conditions according to the environment. That is, the service provider should consider how to use the scarce frequency resources, for example, how much cell radius to have when establishing a base station, how much the frequency requirements of the cell, and the like.
  • the service provider In order to effectively operate the system while maintaining a high quality of service (QoS), the service provider needs to know what the coverage area of the network is, for example, the call quality state in the cell or the state of signal transmission and reception.
  • QoS quality of service
  • An object of the present invention is to provide an apparatus and method for performing MDT in a wireless communication system.
  • An object of the present invention is to provide an apparatus and method for switching an MDT mode according to a state of a user equipment (UE) in a wireless communication system.
  • UE user equipment
  • An object of the present invention is to provide an apparatus and method for changing an MDT setting in accordance with switching of an MDT mode in a wireless communication system.
  • An object of the present invention is to provide an apparatus and method for efficiently controlling a log mode and a reduced log mode according to a state of a UE in a wireless communication system.
  • An embodiment of the present invention is an MDT method of a terminal, the method comprising: receiving mode switching information about switching the MDT mode from a base station to a reduced MDT mode performed by reducing the degree of MDT performance; Determining whether to switch the MDT mode based on the related information; when determining to switch the MDT mode, changing the MDT setting and performing the MDT according to the changed MDT setting. MDT method of the terminal.
  • the mode switching information may be information on the setting of the saving MDT mode included in the MDT setting request message or the permission instruction for switching the MDT mode to the saving MDT mode.
  • the switching to the reduced MDT mode may be determined by comparing the current state value of the terminal with a predetermined reference state value.
  • the current state value may be the remaining battery amount of the terminal, and the reference state value may be a reference battery amount required to maintain the MDT mode, and in the determining step, the remaining battery of the terminal When it is determined that the amount is smaller than the reference battery amount, the MDT mode of the terminal may be switched to the reduced MDT mode.
  • the current state value may be an available memory of the terminal, and the reference state value may be a reference available memory required to maintain the MDT mode, and in the determining step, available of the terminal If it is determined that the memory is less than the reference available memory, it may be determined to switch the MDT mode of the terminal to the reduced MDT mode.
  • the mode switching information is a mode switching instruction for switching the MDT mode to the reduced MDT mode
  • it may be determined to switch the MDT mode of the terminal to the reduced MDT mode.
  • the mode switching information may be included in the MDT setting request message and transmitted from the base station to the terminal.
  • the MDT configuration in the changing step, may be changed according to the MDT configuration information transmitted from the base station, and the MDT configuration information may be transmitted together with the mode switching information.
  • the terminal may change the MDT setting based on the MDT mode and the current state of the terminal, and transmit the information about the changed MDT setting to the base station.
  • the MDT of the event trigger MDT method is performed only by ranking the triggering events for performing the MDT of the event trigger MDT method and performing the event trigger MDT method only when a triggering event with a predetermined rank or more occurs. You can change the setting.
  • the rank between the triggering event and the information about the predetermined rank may be transmitted from the base station together with the mode switching information.
  • Another embodiment of the present invention is an MDT method of a base station, the method comprising: determining to switch the MDT mode of the terminal to the reduced MDT mode performed by reducing the degree of MDT performance, based on the determination, to the terminal Comprising the step of configuring the mode switching information on the MDT mode switching to be transmitted and transmitting the mode switching information to the terminal.
  • the mode switching information includes mode switching allowance instruction for switching the MDT mode to the saving MDT mode, setting information of the saving MDT mode included in the MDT setting request message, or saving the MDT mode MDT. It may be any one of a mode switching instruction to switch to the mode.
  • the mode switching information may include information on a triggering event that triggers an MDT of an event triggered MDT method in the reduced MDT mode.
  • the mode switching allowance instruction and the mode switching instruction may be to allow or indicate the switching of the MDT mode when the memory or the battery of the terminal is insufficient, and the setting information of the reduced MDT mode is the terminal May be setting information of a mode that can be switched when the memory or battery of the battery is low.
  • Another embodiment of the present invention is an MDT apparatus, comprising: an RF unit for receiving MDT mode switching information and a controller for determining switching of the MDT mode based on the MDT mode switching information, wherein the control unit includes an MDT If you decide to switch modes, you can reduce the amount of battery, memory, or battery and memory used in the MDT.
  • the controller can determine to switch the MDT mode according to the state of the battery, the memory or the battery and the memory.
  • Another embodiment of the present invention is an MDT apparatus, comprising: a control unit for determining whether to switch the MDT mode of a terminal and an RF unit for transmitting MDT mode switching information according to the determination, wherein the MDT mode switching information May be any one of an MDT mode switching permission instruction, an MDT mode switching instruction, and setting information of the switched MDT mode.
  • the controller may determine whether to switch the MDT mode of the terminal according to the memory, battery or the state of the memory and the battery of the terminal.
  • network information required in a wireless communication system can be effectively obtained through MDT.
  • the present invention by switching the MDT mode according to the state of the UE, it is possible to efficiently perform the MDT of the UE, and at the same time it is possible to continue to acquire the necessary information in the base station.
  • the UE which switched the MDT mode can perform the MDT efficiently.
  • FIG. 1 is a conceptual diagram schematically illustrating a concept of a driving test for measuring wireless call quality and / or coverage using a vehicle in a system to which the present invention is applied.
  • FIG. 2 is a conceptual diagram schematically illustrating an example of measuring a communication environment, that is, wireless call quality and / or coverage, of a network using MDT in a system to which the present invention is applied.
  • FIG. 3 is a flowchart schematically illustrating an example of an MDT configuration method in a system to which the present invention is applied.
  • FIG. 4 is a conceptual diagram schematically illustrating an example of configuring a log in the case of periodic MDT in a system to which the present invention is applied.
  • FIG. 5 is a flowchart schematically illustrating a method for setting an event triggered MDT in a system to which the present invention is applied.
  • FIG. 6 is a conceptual diagram schematically illustrating an example of creating a log in a mixture of a periodic method and an event trigger method in a system to which the present invention is applied.
  • FIG. 7 is a flowchart schematically illustrating a UE switching to SLMDT mode by an SLMDT allowance indicator transmitted by a base station in a system to which the present invention is applied.
  • FIG. 8 is a flowchart schematically illustrating a UE switching to SLMDT mode by an SLMDT switch indicator transmitted by a base station in a system to which the present invention is applied.
  • FIG. 9 is a flowchart schematically illustrating a method for a UE to switch from an MDT mode to an SLMDT mode by using an MDT log setting request message transmitted from a base station in a system to which the present invention is applied.
  • FIG. 10 is a flowchart schematically illustrating a method of changing SLMDT mode setting of a UE by a message transmitted from a base station in a system to which the present invention is applied.
  • FIG. 11 is a block diagram schematically showing a system to which the present invention is applied.
  • the present specification describes a wireless communication network
  • the operation performed in the wireless communication network is performed in the process of controlling the network and transmitting data in the system (for example, the base station) that is in charge of the wireless communication network, or the corresponding wireless Work may be done at the UE coupled to the network.
  • the wireless communication system to which the present invention is applied may be a network structure of 3GPP LTE / LTE-A.
  • the Evolved-UMTS Terrestrial Radio Access Network includes a base station (BS) that provides a control plane and a user plane to a user equipment (UE).
  • BS base station
  • UE user equipment
  • the UE may be fixed or mobile and may be referred to by other terms such as mobile station (MS), user terminal (UT), subscriber station (SS), mobile terminal (MT), and wireless device (Wireless Device).
  • a base station refers to a fixed station that communicates with a UE, and may be called in other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, and the like.
  • eNB evolved-NodeB
  • BTS base transceiver system
  • access point and the like.
  • One or more cells may exist in one eNB.
  • the cell should be interpreted in a comprehensive sense indicating some areas covered by the eNB, and encompasses various coverage areas such as mega cells, macro cells, micro cells, pico cells, femto cells, and relays.
  • An interface for transmitting user traffic or control traffic may be used between eNBs.
  • eNBs may be connected to each other via an X2 interface.
  • downlink means communication from the eNB to the UE
  • uplink means communication from the UE to the eNB.
  • the transmitter may be part of the eNB and the receiver may be part of the UE.
  • a transmitter may be part of a UE, and a receiver may be part of an eNB.
  • the UE measures the communication quality of a serving cell currently providing a service and the communication quality of a neighbor cell around the serving cell continuously or at a specific time point.
  • the UE transmits the communication quality of the measured cells to the network according to the network demand, the UE's own needs, or according to predetermined rules or instructions, and the network sends a handover command to the UE based on the measurement reported by the UE. You can also get off.
  • the network can effectively support the mobility of the UE by using the communication quality inside and outside the cell measured by the UE.
  • measurements about the communication environment of the network that the UE measures may be used to build and operate the network system.
  • the network operator when a network operator constructs a wireless communication network, the network operator optimizes a network such as an eNB, a cell environment, or the like by checking whether the coverage is related to the radio call quality or the cell radius of the UE. For example, by identifying the strength of the eNB signal to determine the location where the UE can talk, or the location of the UE that becomes difficult to call due to the attenuation of the signal can be effectively responded to this.
  • measurements of communication quality, including signal strength of the eNB may be used to identify a shaded area that is a location where the UE cannot make a call and to solve the problem.
  • FIG. 1 is a conceptual diagram schematically illustrating a concept of a driving test for measuring wireless call quality and / or coverage using a vehicle in a system to which the present invention is applied.
  • the network operator and the like move within the call area, that is, the cell, of the established eNB 100 using the vehicle 110.
  • the vehicle 110 collects call quality of the region by using the UE and the like mounted through all possible places in the cell.
  • the call quality in the cell varies due to various factors such as the placement of buildings 130 in the cell or the top and bottom of the terrain. For example, there may be callable areas 140 and 150, while there may be call shading areas 160. Furthermore, there may be a region 140 having a good call quality and a region 150 having a poor call quality among the callable regions.
  • call quality may vary depending on the distance from the eNB 100. For example, since the region 140 having a good call quality is closer to the eNB 100 than the region 150 having a poor call quality, the call quality may be expected to be better in terms of transmission power. However, as mentioned above, call quality or call condition is affected by various factors. Given topographical influences, such as building 130, actual local call quality may be different than expected. For example, the same may be located between buildings and not far from the eNB, but may be a call shading area 160.
  • a method of measuring call quality in the network while minimizing driving test (Minimization Driving Test: MDT, hereinafter referred to as 'MDT') may be considered.
  • the MDT may be classified into a periodic MDT and an event triggered MDT according to a method in which a measurement is performed.
  • the UE measures about network communication quality and creates / stores / manages logs according to a preset period during a preset period.
  • the UE measures the radio environment for the MDT is called a log.
  • the log may be referred to as information that the UE measures and stores in a memory such a communication environment such as signal strength, measurement location, and measurement time of a serving cell or an adjacent cell.
  • the UE may continuously accumulate and store the log as a new log.
  • the UE may report to the network or eNB that it currently has a log (Log) accumulated through the MDT.
  • Log log
  • the UE may transmit the log information to the corresponding network or eNB.
  • Event Trigger MDT performs MDT measurements in accordance with the occurrence of a triggering event.
  • the UE may make MDT measurements and log according to predetermined rules or instructions. Alternatively, even if a triggering event occurs, the UE may make MDT measurements and log only if there is a clear request from the network.
  • the MDT measurement and writing a log may be simply expressed as 'logging (measurement result)'.
  • the MDT may be classified into an IMMD (Immediate MDT) and an LMDT (Logged MDT) according to a mode in which a measurement is performed. In both cases, the IMDT and the LMDT receive the MDT configuration in the RRC_CONNECTED mode.
  • IMMD immediate MDT
  • LMDT Logged MDT
  • the UE in the RRC_CONNECTED mode may perform the measurement according to the MDT configuration at a certain period.
  • the UE in the RRC_CONNECTED mode may perform the measurement when the triggering event occurs according to the eNB's instructions or predetermined.
  • the UE may log the measurement results. For example, the UE may log when Radio Link Failure (RLF) occurs.
  • the UE may transmit to the eNB that it is in a state capable of reporting logs, through which the eNB may determine that the UE is in a state capable of MDT reporting.
  • the eNB may request the MDT report from the UE.
  • the eNB may send a message requesting the MDT report in a message requesting information about a measurement generally performed by the UE, such as channel information.
  • the UE may transmit the MDT report message to the eNB based on the measured log.
  • the UE in the RRC_IDLE mode may perform the measurement at regular intervals according to the MDT configuration. For example, the UE may wake up every cycle, which is set to a constant multiple of the 'On Duration' cycle of the DRX, and measure according to the MDT configuration. In addition, the UE may perform the measurement when the triggering event occurs according to the eNB's instructions or predetermined. According to the MDT configuration, the UE which performed the measurement logs the measurement result. The UE in the RRC_IDLE mode may access the cell through, for example, a cell selection / reselection process.
  • the UE may transmit to the eNB that it is in a state capable of reporting a log through the process of accessing the cell, and through this, the eNB may determine that the UE is able to report MDT.
  • the eNB may request the MDT report from the UE. For example, the eNB may transmit a message requesting an MDT report in an information request message.
  • the UE may transmit the MDT report message to the eNB based on the measured log.
  • FIG. 2 is a conceptual diagram schematically illustrating an example of measuring a communication environment, that is, wireless call quality and / or coverage, of a network using MDT in a system to which the present invention is applied.
  • the measurement vehicle 110 by using a plurality of UEs 200 scattered in a cell to measure wireless call quality, the measurement vehicle 110 only needs to travel the minimum path 160.
  • measurements for the wireless environment are performed at multiple UEs in various places within the cell. Each UE can measure the radio environment at the current location according to the MDT configuration.
  • the UE may continuously accumulate and store the log as a new log.
  • the UE may report to the network or eNB that it currently has a log (Log) accumulated through the MDT.
  • the UE may transmit the log to the corresponding network or eNB.
  • FIG. 3 is a flowchart schematically illustrating an example of an MDT configuration method in a system to which the present invention is applied.
  • the network configures MDT setting parameters (S310).
  • the network includes not only a simple network or a core network, but also includes an eNB (eNB) or an UTRAN of 3GPP, an E-UTRAN of LTE, and a UMTS of WCDMA.
  • eNB eNB
  • a network may be used as a concept including not only a simple network or a core network, but also an eNB or an eNB or a UTRAN of 3GPP, an E-UTRAN of LTE, a UMTS of WCDMA, etc., unless otherwise specified.
  • MDT configuration parameters may be configured at the eNB, or MDT configuration parameters may be configured at the eNB.
  • the MDT configuration parameter configured in the network includes the measurement object, the duration of the MDT measurement, the period of MDT measurement, the report method of the log, and the log report. Period, time of eNB, and the like.
  • a parameter related to the type of triggering event may be further included.
  • the network may set, through a parameter about an object of MDT measurement, an object to be measured by the UE in order to obtain information about a communication state or call quality of the network.
  • the MDT measurement object may be limited to the signal quality of the serving cell and may be set to include the strength of the signal transmitted from the eNB of the neighboring cell as needed.
  • the network may set the duration of the MDT measurement and the period of measurement performed during the measurement period through parameters related to the duration and the period of the MDT measurement.
  • the MDT measurement may be periodically performed at a predetermined time period for a predetermined time period, or the MDT measurement may be performed for a predetermined period of time after the triggering event occurs, and may be set to end.
  • the network may set the manner of conveying the results of the MDT measurement from the UE to the network through parameters related to the way of reporting the logs.
  • the network requests the report of the log to the UE, it can be made to report the log information to the network.
  • the UE may transmit to the network or eNB that it currently has a log accumulated through the MDT.
  • the network may determine the status of the log of the UE received from the UE, and then request the UE to report the log.
  • the UE may report the log to the network or periodically report the log at a certain time.
  • the network may set the reporting period of the log through a parameter related to the reporting period of the log.
  • the network may perform MDT for each MDT measurement target, and may set a log reporting cycle differently for each MDT measurement target.
  • the network may be configured to periodically report a log of some of the MDT measurement targets and some to report only when there is an explicit request from the network.
  • the network may set a reference time for the MDT measurement value through a parameter regarding the time of the eNB.
  • the parameters related to the MDT setting may be variously configured according to the needs of network optimization in addition to the above-described parameters. For example, in relation to the reporting method of the log, the log is reported only when there is an explicit request for reporting the log from the network. However, when there is no explicit request from the network, how to handle the log accumulated therein is described. You can also set parameters. In addition, an existing MDT configuration parameter may be modified or deleted, or a new MDT configuration parameter may be added to the existing MDT configuration parameter.
  • the eNB may include the MDT setting value in a log configuration request message and transmit it to the UE (S320).
  • the log setting request message may include related information required for performing MDT measurement at the UE.
  • the log setup request message may include an indicator to initiate the MDT measurement.
  • the log setting request message may also be an indicator for initiating MDT measurement.
  • the log setting request message may be configured according to the MDT setting parameter.
  • the UE may receive a log setting request message from the eNB and set a log environment according to the MDT setting included in the received message (S330).
  • the network may request a log report from the UE (S340).
  • the UE may create a log report based on the created log (S350).
  • the UE may use the stored log as a log report.
  • the UE may transmit the created log report to the network (S360).
  • the UE has been described as delivering the log to the network only when there is a log report request from the network.
  • the present invention is not limited thereto, and according to a preset condition, the log may be logged even if there is no explicit log request from the network. Can be reported to the network.
  • FIG. 4 is a conceptual diagram schematically illustrating an example of configuring a log in the case of periodic MDT in a system to which the present invention is applied.
  • the UE performs measurement for the network communication environment at every measurement time point T 1 to T 5 according to the MDT measurement period T M.
  • the MDT measurement period and / or MDT measurement period may be configured by the network as a setting parameter of the periodic MDT.
  • the MDT measurement period T M is set to a multiple of the paging DRX cycle T d .
  • LTE supports Discontinuous Reception (DRX), and HSPA, etc., corresponds to a Continuous Packet Connectivity (CPC) function.
  • CPC Continuous Packet Connectivity
  • the UE observes downlink control signaling in one subframe per DRX cycle and maintains a sleep mode in another subframe.
  • the DRX cycle can be used as a criterion for setting the MDT measurement cycle.
  • the UE performs measurement on the network communication environment according to the MDT configuration, and creates a log based on the measured information. At every measurement, logs continue to accumulate and are stored in the UE as new logs. As shown in the example of the log shown in FIG. 4, the log number may be displayed according to a measurement time point to distinguish each log, a timestamp for a value and a measurement time of a measured wireless communication environment, Measurement location information and the like.
  • each log may include various information as necessary.
  • the UE may measure network communication quality and create / store / manage logs according to a preset period for a preset period.
  • an event trigger MDT can be used to more accurately determine the call quality within the cell.
  • FIG. 5 is a flowchart schematically illustrating a method for setting an event triggered MDT in a system to which the present invention is applied.
  • the network sets the method of event trigger MDT (S510).
  • the network is not a simple network or a core network, but a concept including all of the UTRAN of 3GPP, the E-UTRAN of LTE, the UMTS of WCDMA, and the like of the eNB or the eNB. Therefore, the parameters related to the MDT configuration may be configured at the eNB or may be configured at the upper level of the eNB.
  • the network may set the event trigger MDT as a setting separate from the setting of the periodic MDT, or may configure the setting of the periodic MDT and the setting of the event trigger MDT as one setting.
  • the parameters configured to set the event trigger MDT may include parameters related to a type of triggering event in addition to parameters related to logging and / or log reporting.
  • an event trigger MDT for example, update of location information of the UE, change of state of the network measured by the UE, failure of UE operation or eNB operation, and the like can be considered.
  • the network may include the event trigger MDT configuration parameter in a log configuration request message and transmit it to the UE (S520).
  • the log setup request message may include an indicator to initiate an event trigger MDT measurement.
  • the log setting request message may be an indicator to initiate an event trigger MDT measurement.
  • the log setting request message has been described as including the event trigger MDT setting parameter, but the message may be transmitted to the UE by including the event trigger MDT setting parameter in a message other than the log setting request message, or include only the event trigger MDT setting parameter.
  • a message may be configured and transmitted to the UE. When the network transmits an event trigger MDT configuration parameter, it may separately inform the UE of information about this transmission as needed.
  • the UE may set a log environment based on the message received from the network (S530). If the received message includes only parameters related to the event trigger MDT setting, a log environment based on the event trigger MDT setting can be configured. If the received message is, for example, a log setting request message and includes a parameter related to an event trigger MDT setting, a log environment based on the MDT setting of the log setting request message is configured and a log environment based on the event trigger MDT setting is created. Can be configured.
  • the network may request a log for the UE (S540).
  • the UE may create a log report based on the created log (S550). Subsequently, the UE may transmit the created log report to the network (S560).
  • the log report may be the last log stored through the log set by the UE.
  • the UE transmits a log to the network when there is a log request from the network.
  • the present invention is not limited thereto, and the MDT measurement is performed even if there is no explicit log request from the network according to a preset condition. You can also report the logs after a certain amount of time.
  • FIG. 6 is a conceptual diagram schematically illustrating an example of creating a log in a mixture of a periodic method and an event trigger method in a system to which the present invention is applied.
  • the UE performs measurement for the network communication environment according to the periodic MDT setting at every measurement time point T 1 to T 5 , according to the MDT measurement period T M.
  • the measurement period of the periodic MDT and / or the measurement period of the MDT may be configured as a periodic MDT setting parameter.
  • the measurement period or the measurement period of the periodic MDT can be set variously as needed.
  • the measurement period T M of the periodic MDT is set as a multiple of the paging DRX cycle T d .
  • the UE may measure a network communication environment or the like according to the periodic MDT setting, and create a log, which is measurement information. At every measurement, logs continue to accumulate and are stored in the UE as new logs. As can be seen from the example of the log shown in FIG. 6, the log includes a log number for distinguishing the log at each measurement, a timestamp for the measured wireless communication environment, a timestamp for the measurement time, and measurement location information. May be included.
  • a log may include various information as necessary.
  • the UE may measure and log a network communication environment according to the event triggered MDT setting.
  • the log may be configured differently according to the type of triggering event. For example, if the triggering event is a change of the location information of the UE, the log for the event trigger MDT may include the location information of the UE and a timestamp at the measurement, as shown.
  • Logs for periodic MDTs and event triggers The logs for MDTs can be created / stored / managed / reported according to different settings in the UE.
  • the UE may perform log generation / storage / management / reporting of the log for the periodic MDT and the log for the event trigger MDT according to some or all of the same settings as necessary.
  • the network may report to the network if there is an explicit report request, and in the case of an event trigger MDT, the log may be reported to the network if a predetermined condition is satisfied without the network's explicit report request. have.
  • the network may report to the network if there is an explicit report request, and in the case of a periodic MDT, a log may be reported to the network if a predetermined condition is satisfied without the network's explicit report request.
  • the UE is operated with a limited battery and memory.
  • LMBT is performed in the RRC_IDLE mode and IMDT is performed in the RRC_CONNECTED mode, but in both cases, some of the memory of the UE is used to perform the MDT, but also brings power consumption.
  • the LMDT it is necessary to minimize battery consumption in order to obtain a battery required to operate during the standby time required by the UE in the RRC_IDLE mode.
  • the UE cannot reject the eNB's request to perform MDT.
  • a UE implemented to perform IMDT or LMDT receives an MDT configuration request from an eNB, the UE performs a corresponding MDT operation. Therefore, if necessary, a method of performing MDT is required so that the UE can minimize battery consumption and optimize memory usage.
  • the LMDT or IMDT performed within a range of minimizing battery consumption of the UE and optimizing the memory usage of the UE is referred to as a SLMDT (Saving Logged MDT) mode or a reduced MDT mode for convenience of description.
  • the SLMDT mode may also be defined in IMDT.
  • the SLMDT mode may be defined in the LMDT.
  • the SLMDT may be defined even when using an IMDT and an LMDT simultaneously.
  • the operation of the SLMDT mode may be used for the purpose of minimizing battery usage and optimizing memory usage, and for diversifying the MDT execution method of the UE.
  • the SLMDT mode may be used not only for minimizing battery usage or optimizing memory usage, but also for allowing UEs to perform MDT in various modes or configurations.
  • the UE can minimize battery usage and optimize memory usage.
  • the minimum measurement information necessary to grasp the network environment such as call quality or coverage measurement, can be continuously obtained from the UE. Therefore, it is possible to solve the problem that the measurement information is not obtained at all by stopping the MDT measurement by a method such as stopping the MDT operation due to battery / memory limitation.
  • the Logged MDT (LMDT) mode of the UE indicates in what state the UE performs LMDT.
  • the LMDT mode of the UE may indicate whether the UE is a normal NLMDT (Normal Logged MDT) mode or SLMDT (Saving Logged MDT) mode.
  • NLMDT Normal Logged MDT
  • SLMDT Saving Logged MDT
  • the NLMDT mode refers to a method in which a UE performs MDT measurement for creating an MDT log according to configuration values requested through an MDT log configuration request.
  • the UE creates MDT logs by performing all the MDT measurements indicated by the eNB through the MDT log configuration request.
  • the SLMDT mode refers to a method in which a UE performs MDT measurement for creating an MDT log within a range of minimizing battery consumption and optimizing memory usage.
  • the UE can create an MDT log by performing only a minimum of MDT measurements, while maintaining battery and optimizing memory usage.
  • the memory or battery may stop performing MDT so that the UE can maintain the battery and use the memory.
  • only MDT measurement which is essential to be performed, may be selectively performed.
  • only the MDT measurement to be performed for a specific purpose may be selectively performed.
  • the number of MDT measurements can be reduced or increased by increasing or maximizing the MDT logging interval or MDT logging period to minimize MDT logging and therefore MDT measurement. I can minimize it.
  • the MDT may be temporarily stopped by setting the MDT logging interval or logging interval to a sufficiently small value.
  • the execution time of the MDT measurement required for the MDT logging can be reduced or minimized.
  • the MDT may be temporarily stopped by setting the logging period to zero.
  • the MDT may be performed only when a triggering event corresponding to a predetermined rank occurs.
  • the number of times of MDT measurement, the time of MDT measurement, the amount of information of a log, etc. may be adjusted.
  • the eNB may separately transmit the SLMDT allowance indicator or may include information on the SLMDT configuration in the MDT log configuration request.
  • the UE may determine that the switch to the SLMDT mode is allowed, and determine the switch to the SLMDT mode according to the state of the UE.
  • the eNB may send a SLMDT switch indicator to the UE indicating to switch to the SLMDT mode.
  • the UE receives the SLMDT switch indicator, the UE switches the mode of the LMDT to the SLMDT mode.
  • FIG. 7 is a flowchart schematically illustrating a UE switching to SLMDT mode by an SLMDT allowance indicator transmitted by an eNB in a system to which the present invention is applied.
  • the example of FIG. 7 may be a case where the UE receives the SLMDT grant indicator and switches to the SLMDT mode while performing the MDT.
  • the example of FIG. 7 may be a case where the eNB allows MDT to perform MDT in the SLMDT mode, and the UE that receives the SLMDT allowance indicator determines whether to change an existing configuration to start performing MDT in the SLMDT mode.
  • the eNB determines whether to allow the UE to perform MDT in SLMDT mode (S710).
  • the decision of the eNB may take into account the network state, the communication state and / or the state of the UE.
  • the UE may send a message to the eNB requesting the eNB to perform the MDT in SLMDT mode and / or information about its state, such as the state of the battery and / or memory. Accordingly, the eNB may determine whether to allow the MDT mode conversion of the UE based on information regarding the state of the battery or the memory received from the UE.
  • the eNB transmits an SLMDT allowance indicator to the UE (S720).
  • the SLMDT permission indicator may be included in an MDT Configuration Message and transmitted.
  • the MDT configuration message may be included in an MDT Log Configuration Request message or a LoggedMeasurementConfiguration message.
  • a separate message for transmitting the SLMDT allowance indicator may be defined, and the SLMDT allowance indicator may be transmitted using this.
  • the UE may send an ACK (ACKnowledge) message for the SLMDT grant indicator to the eNB.
  • ACK acknowledge
  • the UE Upon receiving the SLMDT allowance indicator, the UE is in a state capable of switching from the NLMDT mode to the SLMDT mode. The UE determines whether to switch to the SLMDT mode (S760).
  • the UE switches the MDT mode to the SLMDT mode (S740).
  • the MDT logging interval, MDT logging period, or MDT logging period of the UE may be changed.
  • the MDT logging interval or MDT logging interval of the SLMDT is longer than the interval or period set in the MDT Log Configuration Request, so that the UE can perform Logged MDT (LMDT) with less or minimum limits. It can be set to an interval value or a period.
  • the MDT logging period of the SLMDT may be set to a shorter period than the period set in the MDT log setting request, so that the UE can perform the LMDT with less or minimum limits.
  • the UE that switches the MDT mode to the SLMDT mode may perform MDT according to the setting (S750).
  • the UE may transmit the log report created as a result of the MDT to the eNB according to the log report request of the eNB or according to the setting (S760).
  • the eNB may send an SLMDT switch indicator indicating to the UE to switch to the SLMDT mode to switch the MDT mode of the UE.
  • the UE receives the SLMDT switch indicator, the UE switches the mode of the LMDT to the SLMDT mode.
  • FIG. 8 is a flowchart schematically illustrating a UE switching to SLMDT mode by an SLMDT switch indicator transmitted by an eNB in a system to which the present invention is applied.
  • the UE only describes switching the MDT mode to the SLMDT mode. Accordingly, the example of FIG. 8 may be a case where the UE receives the SLMDT switch indicator and switches to the SLMDT mode while performing the MDT. In addition, the example of FIG. 8 may be a case where the eNB determines to perform MDT in the SLMDT mode, and the UE that receives the SLMDT switch indicator initiates performing MDT in the SLMDT mode by changing the MDT mode.
  • the UE may report a state of the UE to the eNB (S810).
  • the status report of the UE may be performed periodically, may be set to be made only in a specific case, or may be made at the request of the eNB.
  • the UE reports the state of the UE to the eNB, the present invention is not limited thereto.
  • the eNB may determine the state of the UE in various ways.
  • the status report of the UE may include a message requesting the eNB to perform the MDT in the SMLDT mode.
  • the eNB may determine whether to allow the UE to perform MDT in the SLMDT mode based on the state information of the UE (S820).
  • the eNB may determine the state of the UE, such as the state of the battery or the state of the memory, to determine whether to perform the MDT in the SLMDT mode. For example, when the memory is low or the battery is low, it can be switched to the SLMDT. Or you can use SLMD mode even if you don't run out of memory or run out of battery but don't need all the measurement reports and only some measurement information. This prevents the occurrence of low memory or low battery conditions in advance.
  • the required measurement report may be selected by the terminal or selected by the information instructed by the eNB.
  • the eNB may transmit a SLMDT switch indicator to the UE (S830).
  • the SLMDT switch indicator may be transmitted in an MDT configuration message.
  • the MDT configuration message may be included in an MDT Log Configuration Request message or a LoggedMeasurementConfiguration message.
  • a separate message for transmitting the SLMDT switch indicator may be defined, and the SLMDT switch indicator may be transmitted using this.
  • the UE may send an ACK message for the SLMDT switch indicator to the eNB.
  • the UE Upon receiving the SLMDT switch indicator, the UE switches the MDT mode to the SLMDT mode (S840).
  • the MDT logging interval, MDT logging period, or MDT logging period of the UE may be changed.
  • the MDT logging interval or MDT logging interval of the SLMDT is longer than the interval or period set in the MDT Log Configuration Request, so that the UE can perform Logged MDT (LMDT) with less or minimum limits. It can be set to an interval value or a period.
  • the MDT logging period of the SLMDT may be set to a shorter period than the period set in the MDT log setting request, so that the UE can perform the LMDT with less or minimum limits.
  • the UE that switches the MDT mode to the SLMDT mode may perform MDT according to the setting (S840).
  • the UE may transmit the log report created as a result of the MDT to the eNB according to the log report request of the eNB or according to the setting (S850).
  • the eNB may enable the UE to switch to the SLMDT mode by including information on the setting of the SLMDT mode in the MDT Log Configuration Request message for performing the MDT.
  • the eNB may transmit the SLMDT allowance indicator or the SLMDT switch indicator in the MDT log setting request message, but this is described in the above-described method of using the SLMDT allowance indicator and the method of using the SLMDT switch indicator. Only the case of transmission including the log setting request message will be described.
  • FIG. 9 is a flowchart schematically illustrating a method for a UE to switch from an MDT mode to an SLMDT mode by using an MDT log setting request message transmitted by an eNB in a system to which the present invention is applied.
  • the UE only describes switching the MDT mode to the SLMDT mode. Accordingly, the example of FIG. 9 may be a case where the UE switches the MDT log setting request message including information on the setting of the SLMDT mode to the SLMDT mode while performing the MDT.
  • the eNB transmits an MDT log setting request message to the UE with information on setting of the SLMDT mode so that the eNB performs MDT in the SLMDT mode, and correspondingly, the UE changes the MDT mode to the MDT to the SLMDT mode. This may be the case when starting performance.
  • the eNB configures the MDT setting (S910).
  • the MDT setup includes a parameter of the information needed to perform the MDT.
  • MDT configuration parameters include, for example, the measurement object of the MDT measurement, the duration of the MDT measurement, the period of the MDT measurement, the logging method, the logging method, and the reporting period of the log. , parameters of an eNB time, a triggering event type, and the like may be included.
  • the eNB may further configure the MDT setting by further including a parameter related to the SLMDT setting.
  • the MDT configuration configured by the eNB may include parameters related to the SLMDT mode, such as a logging interval or period in the SLMDT mode, a logging period, a triggering event priority, and a reference state value for switching the SLMDT mode.
  • parameters related to the SLMDT mode such as a logging interval or period in the SLMDT mode, a logging period, a triggering event priority, and a reference state value for switching the SLMDT mode.
  • the eNB determines whether the UE needs to switch to the SLMDT mode at the request of the UE or on the basis of the UE state information or the network state information, and accordingly, the MDT configuration information includes a parameter relating to the setting of the SLMDT mode. Can be.
  • the eNB may send an MDT log setup request message including information on the MDT setup to the UE (S920).
  • the MDT log configuration request message includes information for performing MDT of the UE.
  • the UE may send an ACK message to the eNB.
  • the MDT log setting request message may be transmitted including the SLMDT allowance indicator or the SLMDT switching indicator, but the case where the MDT log setting request is transmitted includes information on the SLMDT setting.
  • the log setting request message includes a measurement object of MDT measurement, a duration of MDT measurement, a period of MDT measurement, a logging method, a log reporting method, and a log reporting period.
  • parameters such as the eNB time, the type of triggering event, and the like, as well as the logging interval or period in the SLMDT mode, the logging period, the priority of the triggering event, and the reference status values for switching the SLMDT mode. It may include a parameter relating to.
  • the UE Upon receiving the MDT log setting request message, the UE performs MDT according to the MDT setting included in the received message (S930).
  • the UE reads out information from the MDT log configuration request message about a measurement object, a duration of the MDT measurement, a period of the MDT measurement, and a logging method. Therefore, MDT can be performed accordingly.
  • the UE may switch the MDT mode to the SLMDT mode according to the information about the setting of the SLMDT mode included in the MDT log setting request message (S940). If the MDT log configuration request message includes information on the setting of the DLMDT mode, the UE may determine that the eNB has allowed to switch to the SLMDT mode. Thus, the UE can determine whether to switch to SLMDT mode. A method of determining whether the UE switches to the SLMDT mode will be described in detail in the following ⁇ SLMDT mode switch determination method>.
  • the UE that determines to switch to the SLMDT mode may change the MDT setting according to the SLMDT mode.
  • the change of the MDT setting according to the UE switching to the SLMDT mode will be described later in ⁇ Setting of the SLMDT Mode>.
  • the MDT log setup request message By sending an MDT log setup request message to the UE that has already switched to the SLMDT mode or the UE that has already performed MDT in the SLMDT mode, the MDT log setup request message including information on the setup of the SLMDT authorization indicator, the SLMDT switch indicator, or the SLMDT mode. , eNB may change the SLMDT configuration of the UE.
  • FIG. 10 is a flowchart schematically illustrating a method of changing a SLMDT mode setting of a UE by a message transmitted from an eNB in a system to which the present invention is applied.
  • the UE can change the MDT mode to the SLMDT mode or has already performed MDT in the SLMDT mode (S1010).
  • the UE receives the SLMDT allowance indicator from the eNB or receives the MDT log setting request message including the information on the setting of the SLMDT mode, the UE is in a state capable of switching to the SLMDT mode.
  • the UE receives the SLMDT allowance indicator, or receives the MDT log setup request message containing information on the setting of the SLMDT mode and accordingly switched the MDT mode to the SLMDT mode, or receives the SLMDT switch indicator from the eNB and accordingly If the MDT mode is switched to the SLMDT mode, the UE is in the SLMDT mode.
  • the eNB may transmit an MDT log configuration request message including information about the SLMDT allowance indicator, the SLMDT switch indicator, or the SLMDT mode configuration to change the SLMDT mode configuration of the UE (S1020).
  • the UE may receive a SLMDT permit indicator, SLMDT switch indicator, or MDT log setting request message in a switchable SLMDT mode, or may receive a SLMDT accept indicator, SLMDT switch indicator, or MDT log setting request message in a SLMDT mode. have.
  • the UE may receive information about the setting of the SLMDT mode included in the SLMDT allowance indicator, the SLMDT switch indicator, and the MDT log setting request message and transmit an ACK message to the eNB as a response thereto.
  • the information on the setting of the SLMDT mode included in the SLMDT permission indicator, the SLMDT switching indicator, and the MDT log setting request message may be the same as or different from the information about the setting of the SLDMT mode currently owned by the UE. If the information on the setting of the SLMDT mode included in the received SLMDT allowance indicator, the SLMDT switch indicator, and the MDT log setting request message is different from the information on the setting of the SLMDT mode that the UE currently has, information on setting of the SLMDT mode; It may be changed (S1030).
  • the UE In the state where the UE can switch to the SLMDT mode, when the information on the setting of the existing switchable SLMDT mode is different from the information on the setting of the newly received SLMDT mode, the UE can change the setting of the SLMDT mode to switch. Also, even when the UE is already in the SLMDT mode, when the information on the setting of the current SLMDT mode and the information on the setting of the newly received SLMDT mode are different, the UE may continue to perform MDT by changing the setting of the SLMDT mode. have.
  • the setting of the SLMDT mode will be described in detail later in ⁇ Setting of the SLMDT Mode>.
  • the UE receiving the SLMDT switching indicator switches the MDT mode to the SLMDT mode without having to determine whether to switch to the SLMDT mode.
  • the UE may determine whether to switch to SLMDT mode according to the current UE state. That is, the UE may determine whether to switch to the SLMDT mode by comparing the predetermined reference state with the current UE state.
  • the value for the predetermined reference state (hereinafter referred to as a 'reference state value') may be preset in the UE or transmitted from the eNB. When transmitted from the eNB, the predetermined reference state value may be sent together with the SLMDT allowance indicator and may be transmitted in advance or later, separately from the SLMDT allowance indicator.
  • the predetermined reference state value may also be transmitted by being included in an MDT log configuration request message or a LoggedMeasurementConfiguration message.
  • Examples of a state for determining whether to switch to the SLMDT mode may include a state of a memory and / or a state of a battery. Accordingly, the UE may determine whether to switch to the SLMDT mode according to the memory state of the current UE and / or the state of the battery.
  • the memory state value M of the UE considered for switching the SLMDT mode may be a value indicating available memory of the UE in an idle state.
  • the memory state value M may be a value representing available memory of the UE in an active state.
  • the memory state value M may be a value representing available memory of the UE considering both active and inactive states.
  • the battery state value B of the UE considered for switching the SLMDT mode may be a value indicating a wait time of the UE in an idle state.
  • the battery state value B may be a value representing the operational time of the UE in the active state.
  • the battery state value B may be a value representing the battery duration of the UE considering both active and inactive states.
  • the reference memory state value M threshold and / or the reference battery state value B threshold may be considered as a reference state value that is a predetermined criterion for whether to switch to the SLMDT mode.
  • the reference memory status value M threshold represents the available memory required for the UE.
  • the reference battery status value M threshold represents a battery required for the UE to maintain power for the time required for the UE.
  • the reference memory state value M threshold may be a value representing the reference available memory of the UE in the idle state.
  • the memory state value M threshold may be a value indicating reference available memory of the UE in an active state.
  • the memory status value M threshold may be a value representing the reference available memory of the UE considering both active and inactive states.
  • the reference battery status value B threshold may be a value indicating the reference wait time of the UE in the idle state.
  • the battery status value B threshold may be a value indicating a reference operational time of the UE in an active state.
  • the battery status value B threshold may be a value representing a reference battery duration of the UE considering both active and inactive states.
  • the UE may determine whether to switch to the SLMDT mode by comparing the state value of the current UE with the reference state value for the operating state of the same UE. For example, when the state value of the inactive state is used, it is compared with the reference state value of the inactive state, and when the state value of the activated state is used, it is compared with the reference state value of the activated state.
  • Which operating state the current state of the UE is to be compared with the reference state may be explicitly communicated by the eNB.
  • which operation state is based on the SLMDT permission indicator may be transmitted, or may be transmitted in advance or later, separately from the SLMDT permission indicator, or may be transmitted in a MDT log configuration request message or a LoggedMeasurementConfiguration message.
  • Whether to determine whether to switch the SLMDT mode on the basis of the operation state may also be set in advance between the UE or the UE and the eNB. For example, the UE may determine whether to switch to the SLMDT mode by comparing the current state value of the UE with the reference state value for the current operating state.
  • the UE compares the memory state value M of the current UE with the reference state value M threshold of the memory, so that M ⁇ M threshold or M? In case of M threshold , you can decide to switch to SLMDT mode.
  • the UE compares the battery state value B of the current UE with the reference state value B threshold of the battery, so that B ⁇ B threshold or B? In case of B threshold , you can decide to switch to SLMDT mode.
  • the UE may determine whether to switch to the SLMDT mode in consideration of both the state of the memory and the state of the battery. Whether to consider the memory state, the battery state, whether to consider both the memory state and the battery state may be set in advance in the UE or the UE and eNB, or may be explicitly transmitted from the eNB to the UE. In the case where the state to be considered is explicitly communicated from the eNB to the UE, it may be transmitted together with the SLMDT allowance indicator, may be transmitted in advance or later separately from the SLMDT allowance indicator, MDT log configuration request message or LoggedMeasurementConfiguration It may be sent in a message.
  • the UE determines whether to switch to the SLMDT mode in consideration of both the state of the memory and the state of the battery, when the current memory state value and the current battery state value of the UE are both smaller than the reference state value, for example, M ⁇ M When threshold or M ⁇ M threshold and B ⁇ B threshold or B ⁇ B threshold , it may be decided to switch to SLMDT mode. Or when any one of the current memory state value and the current battery state value of the UE is smaller than the reference state value, for example, when M ⁇ M threshold or M ⁇ M threshold or B ⁇ B threshold or B ⁇ B threshold . You may decide to switch.
  • M ⁇ M threshold or M ⁇ M threshold or B ⁇ B threshold or B ⁇ B threshold You may decide to switch.
  • SLMDT when the current memory state value and the current battery state value of the UE are both lower than the reference state value, or when the current memory state value and the current battery state value of the UE are smaller than the reference state value.
  • Whether to switch to the mode may be preset in the UE or may be explicitly delivered from the eNB. If an indication of whether to switch to SLMDT mode is explicitly transmitted from the eNB to the UE only when both the current memory state value and the current battery state value of the UE are smaller than the reference state value, the UE may be transmitted together with the SLMDT allowance indicator. In addition to the SLMDT permission indicator, it may be transmitted in advance or later, or may be transmitted in a MDT log configuration request message or a LoggedMeasurementConfiguration message.
  • the MDT setting of the UE may be changed.
  • Information about the setting of the SLMDT mode may be predetermined between the UE or the UE and the eNB, or may be explicitly transmitted from the eNB. It is also possible to allow the UE to make a choice about the setting of the SLMDT mode and report information about it to the eNB. In addition, even in the event trigger MDT, it is necessary to consider the change of the setting as the MDT mode is switched to the SLMDT mode.
  • Table 1 shows an example of a list of values of the MDT logging interval and the MDT logging period that can be set in the MDT log configuration request.
  • spare refers to a spare data space, which can be used for additional configuration information if needed.
  • LoggingInterval ⁇ ms1280, ms2560, ms5120, ms10240, ms20480, ms30720, ms40960, ms61440 ⁇ LoggingDuration ⁇ min10, min20, min40, min90, min120, sapre1, spare2 ⁇
  • Information about the values configurable in the MDT log configuration request as in the example of Table 1 may be transmitted from the eNB to the UE together with the SLMDT permission indicator, SLMDT switch indicator, or MDT log configuration request message, and the SLMDT permission indicator, SLMDT switch indicator. Or may be delivered from the eNB to the UE in advance or later, separately from the MDT log setup request message.
  • the UE may select the MDT logging interval as predetermined or may select the MDT logging interval according to the instruction transmitted from the eNB. For example, if it is supposed to select the largest value among the configurable values, the UE can minimize the MDT performance by selecting an MDT logging interval of 61440 ms from eight configurable intervals from 1280 ms (milliseconds) to 61440 ms. have. Alternatively, the UE may select from a value larger than the currently set MDT logging interval or an indication may be transmitted from the eNB. For example, the logging interval may be set to a sufficiently large value to cause the MDT to be temporarily interrupted.
  • the UE may select the MDT logging period as previously determined or may select the MDT logging period according to the instruction transmitted from the eNB. For example, if it is supposed to select the smallest value among the configurable values, the UE may minimize the performance of MDT by selecting 10 min among the five configurable periods from 10 min (minutes) to 120 min. Alternatively, the UE may select from a value smaller than the currently set MDT logging period or the indication may be transmitted from the eNB. For example, the MDT logging period may be set to 0 to temporarily stop MDT.
  • a method of changing the setting may be predetermined or explicitly conveyed.
  • the current interval or period may be increased by a predetermined multiple to change the setting, and information about this may be predetermined between the UE or the UE and the eNB or may be explicitly transmitted from the eNB to the UE. It may be.
  • the setting may be changed to an inverse multiple of the current period, and information about this may be predetermined between the UE or the UE and the eNB, or may be explicitly transmitted from the eNB to the UE.
  • a specific setting value may be predetermined between the UE or the UE and the eNB, or may be explicitly transmitted from the eNB to the UE.
  • information about the setting of the SLMDT mode may be explicitly transmitted from the eNB to the UE, it may be transmitted together with the SLMDT allowance indicator or the SLMDT switch indicator, and may be transmitted in advance or later separately from the SLMDT allow indicator or the SLMDT switch indicator. It may be.
  • the information about the setting of the SLMDT mode may be transmitted in a MDT log setting request message or a LoggedMeasurementConfiguration message.
  • the MDT logging interval or period and the MDT logging period are described as examples of the information on the setting of the SLMDT.
  • the present invention is not limited thereto, and the present invention may be equally applied to various MDT configuration information.
  • the UE may select a setting value in the SLMDT mode and take a method in which the UE transmits information about the selected setting value to the eNB.
  • the information on the setting value transmitted may be information necessary for the eNB to utilize log information created in the SLMDT mode.
  • the UE may select a value suitable for the state of the UE from among configurable values in the MDT log setting request as shown in Table 1.
  • the UE may perform an MDT in the SLMDT mode by selecting an interval longer than the current MDT logging interval from eight configurable intervals from 1280 ms to 61440 ms.
  • Table 1 is an example of a setting that can be used by the terminal, and the settable interval is not limited to 1280 ms to 61440 ms, but may include a sufficiently large value. If the UE selects a sufficiently large value, the MDT may be substantially stopped.
  • the UE may perform the MDT in the SLMDT mode by selecting a time shorter than the current MDT logging period among five configurable periods from 10 min (minutes) to 120 min. .
  • a spare may be used to set a sufficiently small value, such as 0. If the UE selects 0, the MDT may be stopped.
  • the UE may transmit information about the selected setting value to the eNB, so that the eNB may effectively utilize the MDT log transmitted from the UE.
  • Information about the selected setting value may be delivered together with the log report or may be delivered in a separate message.
  • the event trigger MDT not only one triggering event but also several events may be set as the triggering event. Therefore, in addition to the above-described settings such as the MDT logging interval, the MDT logging period, the MDT logging period, and the like, it may be necessary to change the settings regarding the plurality of triggering events.
  • the MDT may be performed only when some triggering event for obtaining information required by the eNB among triggering events occurs.
  • the MDT may be performed only when the triggering event of the higher rank occurs.
  • the priority between the triggering events may be set in advance between the UE or the UE and the eNB, or may be explicitly transmitted from the eNB to the UE. If the priority between triggering events is explicitly communicated from the eNB to the UE, it may be sent together with the SLMDT grant indicator or SLMDT switch indicator, and may be transmitted in advance or later separately from the SLMDT grant indicator or SLMDT switch indicator. It may be included in the MDT log configuration request message or the LoggedMeasurementConfiguration message.
  • triggering events set in the NLMDT include location information update of the UE, change of network state measured by the UE, failure of the UE, failure of the eNB, etc.
  • priority may be assigned to these triggering events.
  • the priority may be set in advance between the UE or the UE and the eNB, or may be transmitted to the UE after the eNB determines.
  • the UE may perform the MDT only when a triggering event of a higher rank occurs according to the priority.
  • whether to perform the MDT for only the top few triggering events may be preset between the UE or the UE and the eNB, or may be determined and transmitted by the eNB.
  • in order to change the number of triggering events to perform the MDT according to the current state of the UE may be set in advance between the UE or the UE and the eNB or may be determined by the eNB to forward. For example, when the battery state value B of the current UE is less than the reference battery state value B threshold 1, the MDT is performed only for the top three triggering events, and the battery state value B of the current UE is the reference battery state. If it is smaller than the value (B threshold 2), MDT can be performed only for the top two triggering events.
  • information about the triggering event When information about the triggering event is explicitly transmitted from the eNB to the UE, it may be transmitted together with the SLMDT allowance indicator or the SLMDT switch indicator, or may be transmitted in advance or later separately from the SLMDT allow indicator or the SLMDT switch indicator.
  • the information on the triggering event may be transmitted in a MDT log configuration request message or a LoggedMeasurementConfiguration message.
  • information about the priority may be delivered in various ways. For example, as shown in Table 2, an index corresponding to a triggering event is defined, and a case where eNB and UE share information about a correspondence relationship of Table 2 may be considered.
  • Information such as Table 2 may also be preset between the UE or the UE and the eNB, or determined and transmitted by the eNB. When information such as Table 2 is explicitly transmitted from the eNB to the UE, it may be transmitted together with the SLMDT grant indicator or the SLMDT switch indicator, or may be transmitted in advance or later separately from the SLMDT grant indicator or the SLMDT switch indicator. . In addition, the information as shown in Table 2 may be included in the MDT log configuration request message or LoggedMeasurementConfiguration message and transmitted.
  • the eNB may transmit this priority information to the UE in various ways. For example, a method of transmitting a message (bcad) in which indexes are listed in priority order may be used. In addition, the eNB may use a scheme of transmitting a message such as (a: 2, b: 1, c: 3, d: 4) by setting a rank tag in the number or list of events.
  • the priority information may be transmitted together with the SLMDT grant indicator or the SLMDT switch indicator, or may be transmitted in advance or later separately from the SLMDT grant indicator or the SLMDT switch indicator. In addition, the priority information may be transmitted as included in the MDT log configuration request message or LoggedMeasurementConfiguration message.
  • MDT may be performed for only some of the measurements set in the SLMDT mode.
  • the type of measurement performed in the SLMDT may be explicitly informed by the UE in the eNB or the system.
  • the UE may have a predetermined type of measurement and perform MDT on it. The manner in which the eNB and the system inform the UE about the measurement to be performed in the SLMDT is described in detail.
  • the eNB and / or system are in a state of knowledge of the type of measurement to be performed in the normal mode at the UE.
  • the eNB and / or system may assign a priority for each type of measurement and transmit information on the assigned priority in the UE.
  • the eNB and / or system may group and classify several measurement types.
  • the eNB and / or the system may convey information to the UE about the group of measurements classified into groups.
  • FIG. 11 is a block diagram schematically showing a system to which the present invention is applied.
  • the eNB 1100 includes a transceiver 1120, a storage 1130, and a controller 1140.
  • the eNB 1100 may transmit necessary information to the UE 1110 through the transceiver 1120 and receive necessary information from the UE 1100.
  • the storage unit 1130 may store information necessary for the eNB 1100 to operate a network.
  • the storage unit 1130 may include information about the MDT setting, state information of the UE for determining whether to allow the MDT mode of the UE to switch to the SLMDT mode, and a reference state used by the UE to determine whether to switch to the SLMDT mode.
  • Information on the value, information on the setting of the SLMDT mode, information on the priority of the triggering event, and the like can be stored.
  • the controller 1140 may be connected to the transceiver 1120 and the storage 1130 to control the transceiver 1120 and the storage 1130.
  • the controller 1140 may determine whether to allow the UE 1110 to switch to the SLMDT mode or to switch to the SLMDT mode based on information about the current state of the UE and what MDT information is required.
  • the controller 1140 may configure an SLMDT allowance indicator or an SLMDT switch indicator and transmit the same through the transceiver 1120.
  • the controller 1140 configures an MDT log setting request message including information on the setting of the SLMDT mode and transmits the UE (through the transceiver 1120). 1110 may be transmitted.
  • the controller 1140 determines whether the setting of the SLMDT mode needs to be changed, and informs the UE 1110 of the setting change of the SLMDT mode. You can also send.
  • the UE 1110 includes a transceiver 1150, a storage 1160, and a controller 1170.
  • the UE 1110 may receive necessary information from the eNB 1100 through the transceiver 1150 and transmit necessary information to the eNB 1100.
  • the storage unit 1160 may store information necessary for the UE 1110 to perform communication on the network.
  • the storage unit 1160 may store information on the MDT setting, information on a reference state value for determining whether to switch to the SLMDT mode, information on the setting of the SLMDT mode, information on the priority of the triggering event, and the like. .
  • the controller 1170 may be connected to the transceiver 1150 and the storage 1160 to control the transceiver 1150 and the storage 1160.
  • the controller 1170 may switch the MDT mode to the SLMDT mode.
  • the controller 1170 may determine whether to switch to the SLMDT mode when receiving the SLMDT allowance indicator from the eNB 1100 or an MDT log setting request message including information about the setting of the SLMDT mode. If it is decided to switch to the SLMDT mode, the controller 1170 may switch the MDT mode of the UE 1110 to the SLMDT mode.
  • the controller 1170 may control an operation required for performing the MDT of the UE 1110, for example, specifying the MDT, creating a log, and creating a log report according to the MDT setting.
  • the controllers 1140 and 1170 may include an application-specific integrated circuit (ASIC), another chipset, a logic circuit, and / or a data processing device.
  • the storage units 1130 and 1160 may include a read-only memory (ROM), a random access memory (RAM), a flash memory, a memory card, a storage medium, and / or another storage device.
  • the transceivers 1120 and 1150 may include a baseband circuit for processing a radio signal.

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

Abstract

La présente invention a trait à un appareil et à un procédé permettant de commuter un mode d'essai de commande de minimalisation (MDT). Le procédé permettant de commuter le mode MDT d'un terminal selon la présente invention inclut les étapes consistant : à recevoir des informations de commutation de mode permettant de commuter le mode MDT pour passer à un mode d'économie MDT permettant d'obtenir un fonctionnement à un faible niveau de performance du MDT, à partir d'une station de base ; à déterminer si le mode MDT doit être commuté en fonction des informations de commutation de mode MDT ; à changer le réglage MDT lorsque la commutation du mode MDT est déterminée ; et à procéder au MDT conformément au réglage MDT modifié. La présente invention permet au terminal d'exécuter de façon efficace le MDT en commutant le mode MDT en fonction d'un état du terminal et permet d'obtenir de façon simultanée et continue les informations nécessaires à la station de base.
PCT/KR2012/000130 2011-01-06 2012-01-05 Procédé d'essai de commande de minimalisation et appareil utilisant celui-ci WO2012093875A2 (fr)

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WO2014126421A1 (fr) * 2013-02-14 2014-08-21 엘지전자 주식회사 Procédé pour rendre compte d'information mbms dans un système de radiocommunications, et dispositif conçu à cet effet
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WO2015137684A1 (fr) * 2014-03-13 2015-09-17 Lg Electronics Inc. Procédé et appareil permettant la mise en œuvre d'une mbms-mdt sélective dans un système de communication sans fil
US10257664B2 (en) 2014-03-13 2019-04-09 Lg Electronics Inc. Method and apparatus for performing selective MBMS MDT in wireless communication system
WO2015137656A1 (fr) * 2014-03-14 2015-09-17 Lg Electronics Inc. Procédé et appareil de reconfiguration mbms-mdt dans un système de communication sans fil
CN106031213A (zh) * 2014-03-14 2016-10-12 Lg电子株式会社 在无线通信系统中重新配置mbms mdt的方法和装置
US10111157B2 (en) 2014-03-14 2018-10-23 Lg Electronics Inc. Method and apparatus for reconfiguring MBMS MDT in wireless communication system
CN106031213B (zh) * 2014-03-14 2019-04-23 Lg电子株式会社 在无线通信系统中重新配置mbms mdt的方法和装置
WO2015141976A1 (fr) * 2014-03-15 2015-09-24 Lg Electronics Inc. Procédé et appareil pour configurer mbms-mdt pour de multiples zones mbsfn dans un système de communication sans fil
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CN112312420A (zh) * 2019-07-29 2021-02-02 大唐移动通信设备有限公司 最小化路测的处理、配置方法、装置、终端及网络侧设备
CN112312420B (zh) * 2019-07-29 2022-03-29 大唐移动通信设备有限公司 最小化路测的处理、配置方法、装置、终端及网络侧设备

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