WO2012050323A2 - 무선 통신 시스템에서 로그된 측정 수행 방법 및 장치 - Google Patents
무선 통신 시스템에서 로그된 측정 수행 방법 및 장치 Download PDFInfo
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- WO2012050323A2 WO2012050323A2 PCT/KR2011/007463 KR2011007463W WO2012050323A2 WO 2012050323 A2 WO2012050323 A2 WO 2012050323A2 KR 2011007463 W KR2011007463 W KR 2011007463W WO 2012050323 A2 WO2012050323 A2 WO 2012050323A2
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- terminal
- logging
- state
- state transition
- log
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- 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
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
Definitions
- the present invention relates to wireless communication, and more particularly, to a method for performing a logged measurement in a wireless communication system and an apparatus supporting the same.
- 3GPP LTE long term evolution
- UMTS Universal Mobile Telecommunications System
- 3GPP LTE uses orthogonal frequency division multiple access (OFDMA) in downlink and single carrier-frequency division multiple access (SC-FDMA) in uplink.
- OFDMA orthogonal frequency division multiple access
- SC-FDMA single carrier-frequency division multiple access
- MIMO multiple input multiple output
- LTE-A 3GPP LTE-Advanced
- MDT Minimization of Driving Tests
- MDTs can be divided into logged MDTs and immediate MDTs.
- the terminal transmits a logged measurement to the network at a specific time after performing the MDT measurement.
- the UE performs the MDT measurement and delivers the measurement to the network when the reporting condition is satisfied.
- the logged MDT performs MDT measurements in RRC idle mode, but immediately MDT performs MDT measurements in RRC connected mode.
- the service provider combines MDT measurements received from multiple terminals to create a coverage map that shows the distribution of service availability and quality of service over the entire area in which the service provider provides services, and utilize them for network operation and optimization. Can be. For example, if a coverage problem of a specific area is reported from the terminal, the service provider may expand the coverage of the corresponding area cell by increasing the transmission power of the base station providing the service of the corresponding area.
- logging performed by the terminal may be suspended or limited in logging of the measurement result for various reasons.
- the terminal maintains the setting for logging even if logging is stopped. After that, when the terminal stops logging, the terminal resumes the logging according to the setting maintained. If logging is resumed after stopping, the logging results will not be continuous in time.
- the network receives a partially empty logging result, it cannot know what the wireless environment or performance indicators are for the empty log result. Therefore, there is a need to propose a logging method and a device supporting the situation in which logging is suspended and / or resumed.
- the present invention provides a method of performing a logged measurement in a wireless communication system and an apparatus supporting the same.
- a method of performing a logged measurement performed by a terminal in a wireless communication system receives a measurement configuration from a network, logs a Minimization of Driving Tests (MDT) measurement, detects whether a state transition condition occurs, transitions a state when a state transition condition occurs, and transitions the state. Logging state transition information associated with the.
- MDT Minimization of Driving Tests
- transitioning the state may include transitioning to a logging stop state.
- the state transition information may include an indicator indicating that the transition to the logging stop state.
- the state transition information may further include the logging stop condition.
- the state transition information may further include a time point at which the terminal is in state transition.
- the logging stop condition is that the terminal is out of a radio resource control (RRC) state configured to log, the terminal is left out of a radio access technology (RAT) configured to log, the terminal is out of a logging area, the terminal Out of this logging Public Land Mobile Network (PLMN), the terminal leaving the camped normally state, and the total sum of the log details including the logged MDT measurement and the state transition information reaches a specific value. It may include at least one of the.
- RRC radio resource control
- RAT radio access technology
- PLMN Public Land Mobile Network
- transitioning the state may include transitioning to a logable state and logging an MDT measurement.
- the state transition information may include an indicator indicating that the transition to the logable state.
- the state transition information may further include the loading resume condition.
- the state transition information may further include a time point at which the terminal is in state transition.
- the logging resume condition may include entering a radio resource control (RRC) state in which the terminal is configured to log, entering a RAT configured to be logged by the terminal, entering the logging area by the terminal, and logging by the terminal. It may include at least one of entering the PLMN and entering the camped normally state.
- RRC radio resource control
- the terminal may be configured to log the MDT measurement periodically.
- the terminal may be configured to perform logging based on event occurrence.
- the method may further include receiving a log history report request from the network and sending a log history including the logged MDT measurement and the state transition information to the network in response to the report request.
- a wireless device that performs logged measurements in a wireless communication system.
- the wireless device includes a radio frequency (RF) unit for transmitting and receiving a radio signal and a processor connected to the RF unit.
- the processor receives a measurement configuration from a network, logs an MDT measurement, detects whether a state transition condition occurs, transitions a state when a state transition condition occurs, and state transition information related to the state transition. Is set to log.
- the terminal detects a logging state transition condition and transitions the logging state when the condition occurs.
- the network may configure network performance information such as a coverage map more accurately by referring to information related to stopping or resuming logging included in the log.
- FIG. 1 shows a wireless communication system to which the present invention is applied.
- FIG. 2 is a block diagram illustrating a radio protocol architecture for a user plane.
- FIG. 3 is a block diagram illustrating a radio protocol structure for a control plane.
- FIG. 4 is a flowchart illustrating a process of establishing an RRC connection.
- FIG. 5 is a flowchart illustrating a RRC connection resetting process.
- FIG. 6 is a flowchart illustrating a process of reporting terminal information.
- 11 is a diagram illustrating an example of log contents resulting from interruption and resumption of logging.
- FIG. 12 is a diagram illustrating a MDT measurement logging method that can be applied to an embodiment of the present invention.
- FIG. 13 is a diagram showing an example of log contents according to an embodiment of the present invention.
- FIG. 14 is a block diagram illustrating a wireless device in which an embodiment of the present invention is implemented.
- E-UTRAN Evolved-UMTS Terrestrial Radio Access Network
- LTE Long Term Evolution
- the E-UTRAN includes a base station (BS) 20 that provides a control plane and a user plane to a user equipment (UE).
- the terminal 10 may be fixed or mobile and may be called by other terms such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), a wireless device (Wireless Device), and the like.
- the base station 20 refers to a fixed station communicating with the terminal 10, and may be referred to by 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.
- the base stations 20 may be connected to each other through an X 2 interface.
- the base station 20 is connected to the Serving Gateway (S-GW) through the Mobility Management Entity (MME) and the S1-U through the Evolved Packet Core (EPC) 30, more specifically, through the S1 interface.
- S-GW Serving Gateway
- MME Mobility Management Entity
- EPC Evolved Packet Core
- EPC 30 is composed of MME, S-GW and P-GW (Packet Data Network-Gateway).
- the MME has information about the access information of the terminal or the capability of the terminal, and this information is mainly used for mobility management of the terminal.
- S-GW is a gateway having an E-UTRAN as an endpoint
- P-GW is a gateway having a PDN as an endpoint.
- Layers of the Radio Interface Protocol between the terminal and the network are based on the lower three layers of the Open System Interconnection (OSI) reference model, which is widely known in communication systems.
- L2 second layer
- L3 third layer
- the RRC Radio Resource Control
- the RRC layer located in the third layer plays a role of controlling radio resources between the terminal and the network. To this end, the RRC layer exchanges an RRC message between the terminal and the base station.
- FIG. 2 is a block diagram illustrating a radio protocol architecture for a user plane.
- 3 is a block diagram illustrating a radio protocol structure for a control plane.
- the data plane is a protocol stack for user data transmission
- the control plane is a protocol stack for control signal transmission.
- a physical layer (PHY) layer provides an information transfer service to a higher layer using a physical channel.
- the physical layer is connected to a medium access control (MAC) layer, which is an upper layer, through a transport channel. Data is moved between the MAC layer and the physical layer through the transport channel. Transport channels are classified according to how and with what characteristics data is transmitted over the air interface.
- MAC medium access control
- the physical channel may be modulated by an orthogonal frequency division multiplexing (OFDM) scheme and utilizes time and frequency as radio resources.
- OFDM orthogonal frequency division multiplexing
- the functions of the MAC layer include mapping between logical channels and transport channels and multiplexing / demultiplexing into transport blocks provided as physical channels on transport channels of MAC service data units (SDUs) belonging to the logical channels.
- the MAC layer provides a service to a Radio Link Control (RLC) layer through a logical channel.
- RLC Radio Link Control
- RLC layer Functions of the RLC layer include concatenation, segmentation, and reassembly of RLC SDUs.
- QoS Quality of Service
- the RLC layer has a transparent mode (TM), an unacknowledged mode (UM), and an acknowledged mode (Acknowledged Mode).
- TM transparent mode
- UM unacknowledged mode
- Acknowledged Mode acknowledged mode
- AM Three modes of operation (AM).
- AM RLC provides error correction through an automatic repeat request (ARQ).
- PDCP Packet Data Convergence Protocol
- Functions of the Packet Data Convergence Protocol (PDCP) layer in the user plane include delivery of user data, header compression, and ciphering.
- the functionality of the Packet Data Convergence Protocol (PDCP) layer in the user plane includes the transfer of control plane data and encryption / integrity protection.
- the RRC (Radio Resource Control) layer is defined only in the control plane.
- the RRC layer is responsible for the control of logical channels, transport channels, and physical channels in connection with configuration, re-configuration, and release of radio bearers.
- RB means a logical path provided by the first layer (PHY layer) and the second layer (MAC layer, RLC layer, PDCP layer) for data transmission between the terminal and the network.
- the establishment of the RB means a process of defining characteristics of a radio protocol layer and a channel to provide a specific service, and setting each specific parameter and operation method.
- RB can be further divided into SRB (Signaling RB) and DRB (Data RB).
- SRB is used as a path for transmitting RRC messages in the control plane
- DRB is used as a path for transmitting user data in the user plane.
- the UE If an RRC connection is established between the RRC layer of the UE and the RRC layer of the E-UTRAN, the UE is in an RRC connected state, otherwise it is in an RRC idle state.
- the downlink transmission channel for transmitting data from the network to the UE includes a BCH (Broadcast Channel) for transmitting system information and a downlink shared channel (SCH) for transmitting user traffic or control messages.
- Traffic or control messages of a downlink multicast or broadcast service may be transmitted through a downlink SCH or may be transmitted through a separate downlink multicast channel (MCH).
- the uplink transport channel for transmitting data from the terminal to the network includes a random access channel (RACH) for transmitting an initial control message and an uplink shared channel (SCH) for transmitting user traffic or control messages.
- RACH random access channel
- SCH uplink shared channel
- BCCH broadcast control channel
- PCCH paging control channel
- CCCH common control channel
- MCCH multicast control channel
- MTCH multicast traffic
- the physical channel is composed of several OFDM symbols in the time domain and several sub-carriers in the frequency domain.
- One sub-frame consists of a plurality of OFDM symbols in the time domain.
- the RB is a resource allocation unit and includes a plurality of OFDM symbols and a plurality of subcarriers.
- each subframe may use specific subcarriers of specific OFDM symbols (eg, the first OFDM symbol) of the corresponding subframe for the physical downlink control channel (PDCCH), that is, the L1 / L2 control channel.
- Transmission Time Interval is a unit time of subframe transmission.
- the RRC state refers to whether or not the RRC layer of the UE is in a logical connection with the RRC layer of the E-UTRAN. If connected, the RRC connection state is called. Since the UE in the RRC connected state has an RRC connection, the E-UTRAN can grasp the existence of the corresponding UE in a cell unit, and thus can effectively control the UE. On the other hand, the UE in the RRC idle state cannot be recognized by the E-UTRAN, and is managed by a core netwrok (CN) in units of a tracking area, which is a larger area unit than a cell. That is, the UE in the RRC idle state is identified only in a large area unit, and must move to the RRC connected state in order to receive a normal mobile communication service such as voice or data.
- CN core netwrok
- the terminal When the user first powers on the terminal, the terminal first searches for an appropriate cell and then stays in an RRC idle state in the cell.
- the UE in the RRC idle state needs to establish an RRC connection, it establishes an RRC connection with the E-UTRAN through an RRC connection procedure and transitions to the RRC connected state.
- RRC connection procedure There are several cases in which the UE in RRC idle state needs to establish an RRC connection. For example, an uplink data transmission is necessary due to a user's call attempt, or a paging message is sent from E-UTRAN. If received, a response message may be sent.
- the non-access stratum (NAS) layer located above the RRC layer performs functions such as session management and mobility management.
- EMM-REGISTERED EPS Mobility Management-REGISTERED
- EMM-DEREGISTERED EMM-DEREGISTERED
- the initial terminal is in the EMM-DEREGISTERED state, and the terminal performs a process of registering with the corresponding network through an initial attach procedure to access the network. If the attach procedure is successfully performed, the UE and the MME are in the EMM-REGISTERED state.
- an EPS Connection Management (ECM) -IDLE state In order to manage a signaling connection between the UE and the EPC, two states are defined, an EPS Connection Management (ECM) -IDLE state and an ECM-CONNECTED state, and these two states are applied to the UE and the MME.
- ECM EPS Connection Management
- ECM-IDLE state When the UE in the ECM-IDLE state establishes an RRC connection with the E-UTRAN, the UE is in the ECM-CONNECTED state.
- the MME in the ECM-IDLE state becomes the ECM-CONNECTED state when it establishes an S1 connection with the E-UTRAN.
- the E-UTRAN does not have context information of the terminal.
- the UE in the ECM-IDLE state performs a terminal-based mobility related procedure such as cell selection or cell reselection without receiving a command from the network.
- a terminal-based mobility related procedure such as cell selection or cell reselection without receiving a command from the network.
- the terminal when the terminal is in the ECM-CONNECTED state, the mobility of the terminal is managed by the command of the network.
- the terminal In the ECM-IDLE state, if the position of the terminal is different from the position known by the network, the terminal informs the network of the corresponding position of the terminal through a tracking area update procedure.
- the system information includes essential information that the terminal needs to know in order to access the base station. Therefore, the terminal must receive all system information before accessing the base station, and must always have the latest system information. In addition, since the system information is information that all terminals in a cell should know, the base station periodically transmits the system information.
- the system information includes a master information block (MIB) and a scheduling block (SB). , SIB System Information Block).
- MIB master information block
- SB scheduling block
- the MIB enables the UE to know the physical configuration of the cell, for example, bandwidth.
- SB informs transmission information of SIBs, for example, a transmission period.
- SIB is a collection of related system information. For example, some SIBs contain only information of neighboring cells, and some SIBs contain only information of an uplink radio channel used by the terminal.
- services provided by a network to a terminal can be classified into three types as follows.
- the terminal also recognizes the cell type differently according to which service can be provided. The following describes the service type first, followed by the cell type.
- Limited service This service provides Emergency Call and Tsunami Warning System (ETWS) and can be provided in an acceptable cell.
- ETWS Emergency Call and Tsunami Warning System
- Normal service This service means a public use for general use, and can be provided in a suitable or normal cell.
- This service means service for network operator. This cell can be used only by network operator and not by general users.
- the cell types may be classified as follows.
- Acceptable cell A cell in which the terminal can receive limited service. This cell is a cell that is not barred from the viewpoint of the terminal and satisfies the cell selection criteria of the terminal.
- Suitable cell The cell that the terminal can receive a regular service. This cell satisfies the conditions of an acceptable cell and at the same time satisfies additional conditions. As an additional condition, this cell must belong to a Public Land Mobile Network (PLMN) to which the terminal can access, and must be a cell which is not prohibited from performing a tracking area update procedure of the terminal. If the cell is a CSG cell, the terminal should be a cell that can be connected to the cell as a CSG member.
- PLMN Public Land Mobile Network
- Barred cell A cell that broadcasts information that a cell is a prohibited cell through system information.
- Reserved cell A cell that broadcasts information that a cell is a reserved cell through system information.
- mobility support of a terminal is essential. Accordingly, the UE continuously measures the quality of the serving cell and the neighboring cell that provide the current service. The terminal reports the measurement result to the network at an appropriate time, and the network provides the terminal with optimal mobility through handover.
- the terminal may perform measurement for a specific purpose set by the network and report the measurement result to the network in order to provide information that may help the operator operate the network in addition to the purpose of mobility support. For example, the terminal receives broadcast information of a specific cell determined by the network.
- the terminal may include a cell identity (also referred to as a global cell identifier) of the specific cell, location identification information (eg, tracking area code) to which the specific cell belongs, and / or other cell information (eg, For example, whether a member of a closed subscriber group (CSG) cell is a member) may be reported to the serving cell.
- a cell identity also referred to as a global cell identifier
- location identification information eg, tracking area code
- other cell information eg, For example, whether a member of a closed subscriber group (CSG) cell is a member
- the mobile station may report location information and measurement results of poor quality cells to the network.
- the network can optimize the network based on the report of the measurement results of the terminals helping the network operation.
- the terminal In a mobile communication system with a frequency reuse factor of 1, mobility is mostly between different cells in the same frequency band. Therefore, in order to ensure the mobility of the terminal well, the terminal should be able to measure the quality and cell information of neighboring cells having the same center frequency as the center frequency of the serving cell. As such, the measurement of the cell having the same center frequency as that of the serving cell is called intra-frequency measurement. The terminal performs the intra-cell measurement and reports the measurement result to the network at an appropriate time, so that the purpose of the corresponding measurement result is achieved.
- the mobile operator may operate the network using a plurality of frequency bands.
- the terminal may measure quality and cell information of neighboring cells having a center frequency different from that of the serving cell. Should be As such, a measurement for a cell having a center frequency different from that of the serving cell is called inter-frequency measurement.
- the terminal should be able to report the measurement results to the network at an appropriate time by performing inter-cell measurements.
- the base station may be configured to measure the cell of the heterogeneous network.
- This measurement for heterogeneous networks is called inter-RAT (Radio Access Technology) measurement.
- the RAT may include a UMTS Terrestrial Radio Access Network (UTRAN) and a GSM EDGE Radio Access Network (GERAN) conforming to the 3GPP standard, and may also include a CDMA 2000 system conforming to the 3GPP2 standard.
- UTRAN UMTS Terrestrial Radio Access Network
- GERAN GSM EDGE Radio Access Network
- FIG. 4 is a flowchart illustrating a process of establishing an RRC connection.
- the terminal sends an RRC connection request message to the network requesting an RRC connection (S410).
- the network sends an RRC connection setup message in response to the RRC connection request (S420). After receiving the RRC connection setup message, the terminal enters the RRC connection mode.
- the UE sends an RRC Connection Setup Complete message to the network, which is used to confirm successful completion of RRC connection establishment (S430).
- RRC connection reestablishment is performed similarly to RRC connection establishment. Re-establishing an RRC connection reestablishes an RRC connection, which involves restarting SRB1 operation, reactivating security, and configuring a primary cell (PCell).
- the terminal sends an RRC Connection Reestablishment Request message to the network requesting an RRC connection reestablishment.
- the network sends an RRC connection reestablishment message in response to the RRC connection reestablishment request.
- the UE sends an RRC connection reestablishment complete message in response to the RRC connection reestablishment.
- RRC connection reconfiguration is used to modify an RRC connection. It is used to establish / modify / release RBs, perform handovers, and set up / modify / release measurements.
- the network sends an RRC connection reconfiguration message for modifying the RRC connection to the terminal (S510).
- the UE sends an RRC connection reconfiguration complete message used to confirm successful completion of the RRC connection reconfiguration to the network (S520).
- FIG. 6 is a flowchart illustrating a process of reporting terminal information.
- the network sends a UE Information Request message to obtain terminal information to the terminal (S610).
- the terminal information request message includes a field indicating whether the terminal reports information on a random access procedure and / or radio link failure.
- the terminal information request message includes a field indicating whether the terminal reports logged measurement.
- the terminal sends a UE Information Response message including the information requested by the terminal information request to the network (S620).
- MDT Minimization of Driving Tests
- MDT is a test that operators use terminals instead of automobiles for coverage optimization. Coverage depends on the location of the base station, the layout of the surrounding buildings, and the environment of use of the user. Therefore, the operator needs to periodically carry out a driving test, which is expensive and resource-intensive. MDT is a service provider to measure the coverage using the terminal.
- MDTs can be divided into logged MDTs and immediate MDTs.
- the terminal transmits a logged measurement to the network at a specific time after performing the MDT measurement.
- the UE performs the MDT measurement and delivers the measurement to the network when the reporting condition is satisfied.
- the logged MDT performs MDT measurements in RRC idle mode, but immediately MDT performs MDT measurements in RRC connected mode.
- the terminal receives the MDT configuration from the network (S710).
- the UE is an RRC connected mode in which an RRC connection is established with a serving cell. Even if the RRC mode is transitioned to the RRC idle mode, the MDT setting is maintained and thus the MDT measurement result is also maintained.
- the MDT configuration may include at least one of a logging interval, a reference time, and an area configuration.
- the logging interval indicates the interval for storing the measurement result.
- the reference time is used to inform the reference time when the terminal sends a logged measurement.
- the area setting refers to an area where the terminal is requested to perform logging.
- the terminal Upon receiving the MDT configuration, the terminal starts a validity timer (S720).
- the validity timer indicates the lifetime of the MDT setting.
- the value of the validity timer may be included in the MDT setting. This value is called a logging duration.
- the terminal sets the value of the validity timer to the logging interval and starts the validity timer.
- the UE switches to the RRC idle mode and logs the measurement based on the MDT configuration while the validity timer is in operation (S730). For example, MDT measurement is performed at every logging period in the MDT configuration.
- the MDT measurement value may be a value well known to those skilled in the art, such as Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), Received Signal Code Power (RSCP), or Ec / No.
- Logging the MDT measurement based on the MDT configuration of the terminal may vary depending on the location of the terminal.
- the network may set a logging area which is an area where the terminal should log.
- the logging area may be represented by a cell list or a tracking area / location area list.
- the first area 810 and the third area 830 are areas set as logging areas, and the second area 820 is areas where logging is not allowed.
- the UE logs in the first region 810 but does not perform MDT measurement logging in the second region 820.
- the terminal logs the MDT measurement again.
- the UE performs logging only when it is camped on the RAT that receives the MDT configuration, and stops logging at another RAT. However, the UE may log cell information of another RAT in addition to the staying RAT.
- the first region 910 and the third region 930 are E-UTRAN regions, and the second region 920 is a UTRAN region. MDT settings are received from the E-UTRAN. The terminal does not perform the MDT measurement when entering the second region 920.
- the terminal discards the MDT configuration (discard) and a conservation timer is started (S740).
- the terminal removes the MDT configuration and stops the MDT measurement.
- logged measurements are maintained.
- the retention timer indicates the lifetime of the logged measurement.
- the logged measurement is discarded (S750). If a report request for logged measurements is received from the base station while the retention timer is running, the terminal may report the logged measurements.
- the value of the retention timer can be fixed.
- the value of the retention timer may be 48 hours.
- the value of the retention timer may be included in the MDT setting, and the base station may inform the terminal.
- a new MDT setting When a new MDT setting is received, it is updated with the new MDT setting and restarts the validity timer. In addition, the logged MDT measurement is discarded according to the previously set MDT setting.
- the UE may send to the base station whether or not the availability of the logged measurement when switching from the RRC idle mode to the RRC connected mode.
- the UE may send an availability indicator to the network when the RRC connection is established, the RRC connection is reestablished, or the RRC connection is reconfigured.
- an availability indicator indicating that there is an MDT measurement logged in the handover target cell may be included in the handover complete message and transmitted to the network.
- the network receiving the logged MDT measurement from the terminal may request the terminal to transmit the logged MDT measurement. Knowing that there is a logged measurement, the network sends an information request to the terminal requesting the report of the logged measurement. The terminal sends an information response including the logged measurement to the network.
- the content measured by the terminal during the MDT measurement is mainly related to the wireless environment.
- MDT measurements may include the cell identifier, the signal quality and / or signal strength of the cell.
- MDT measurements can include measurement time and measurement location.
- the logged measurement includes one or more log entries.
- the log entry includes a logging location, a logging time, a serving cell identifier, a serving cell measurement result, and a neighbor cell measurement result.
- the logging position indicates the position measured by the terminal.
- the logging time represents the time measured by the terminal.
- Information logged at different logging times is stored in different log entries.
- the serving cell identifier may include a cell identifier in layer 3, which is called a global cell identity (GCI).
- GCI global cell identity
- CGI is a set of physical cell identity (PCI) and PLMN identifiers.
- the network has caused the terminal to log MDT measurement results and / or other performance indicators
- the logging performed by the terminal may be suspended for various reasons. For example, even if the terminal is configured to log periodically, the loading of the terminal may be stopped in the following situations.
- the network has set a logging area (List of cells, or List of area codes-Tracking area codes) to the terminal, the serving cell of the terminal is out of the logging area.
- a logging area (List of cells, or List of area codes-Tracking area codes)
- the rPLMN registered PLMN
- the rPLMN registered PLMN
- the network When the network is configured to log only when a certain condition is satisfied, the condition is not satisfied.
- the terminal maintains a setting for logging. After that, if the terminal leaves the logging stop state, the terminal resumes logging according to the logging setting maintained. In this process, in the log contents of the terminal, no logging result is included until the terminal stops logging and resumes. In addition, the terminal does not perform any logging at the time when logging is stopped or resumed.
- 11 is a diagram illustrating an example of a log history resulting from stopping and resuming logging.
- the terminal performs MDT measurement logging during t 1 to t 3 intervals in which logging is allowed.
- the logging stop condition occurs between the time points t 3 and t 4, the terminal stops logging.
- the terminal does not log at the logging time points t 4 and t 5 according to the logging interval.
- the logging resume condition occurs between the time points t 5 and t 6 and the terminal resumes logging.
- the UE continuously performs MDT measurement logging.
- the network receiving such a log may determine that the logging results are not continuous at t 4 and t 5 .
- the network When the network receives log data whose logging results are not continuous in time, that is, log data whose logging results are partially empty, the network may not know what wireless environment or performance indicators the terminal has experienced when the log results are empty. As a result, the network cannot normally obtain an accurate coverage map or other performance indicator through the log received from the terminal.
- a logged measuring method reflecting the state transition of the terminal and an apparatus supporting the same are proposed.
- a specific method of measuring and logging MDT may be applied to the existing MDT measuring method shown in FIG. 7.
- FIG. 12 is a diagram illustrating a MDT measurement logging method that can be applied to an embodiment of the present invention.
- the network transmits measurement logging settings to the terminal to instruct the execution of the measurement logging task (S1210).
- the measurement logging setting may be an MDT setting transmitted by the network to the terminal.
- the measurement logging setting is assumed to be an MDT setting.
- the MDT configuration includes information related to a state transition condition such as the terminal stopping logging or resuming logging.
- the state transition condition is not necessarily included in the MDT configuration and may be transmitted, but may be an information parameter included in another message exchanged with the network or basically provided for the operation of the terminal.
- the UE Upon receiving the MDT configuration, the UE enters the RRC_IDLE state and exists as a logging state, and performs MDT measurement logging based on the MDT configuration (S1020).
- the terminal may operate while transitioning the logging enable state and the logging stop state (not shown).
- the terminal operating in a specific logging state detects whether a state transition condition has occurred (S1230). If the terminal is operating in a logging state, it detects whether a logging stop condition has occurred. If the terminal is operating in a logging stop state, it detects whether a logging resume condition has occurred.
- the logging stop condition may be as follows.
- the terminal is out of the RRC state set to log. (For example, if the network has set the MDT logged, the terminal is in the RRC_Connected state.)
- the terminal accesses another RAT after leaving the RAT configured to log (for example, when receiving the MDT configuration logged in LTE but accessing the UMTS.)
- the network has set a logging area (List of cells or List of area codes-Tracking area codes) to the terminal, the terminal is out of the logging area.
- a logging area (List of cells or List of area codes-Tracking area codes)
- the PLMN or rPLMN of the terminal is not included in the logging PLMN list.
- the network is configured to log only when the terminal meets certain condition (s), and the terminal does not satisfy the condition (s).
- the logging resume condition may be as follows.
- the terminal enters the RRC state configured to log. For example, the terminal enters the RRC_IDLE state.
- the terminal enters the RAT configured to log. For example, when a terminal receiving an MDT configuration from an eNB enters an E-UTRAN cell from a UMTS cell through cell reselection.
- the terminal enters the logging area.
- UE enters logging PLMN.
- the terminal enters a regular camping state.
- the terminal satisfies all the conditions that must be satisfied to perform logging.
- the terminal When the terminal detects that a state transition condition has occurred, the terminal transitions to the logging enabled state or the logging stop state accordingly (S1240), and logs information related to the state transition (S1250). Logging the logging state transition and state transition information of the terminal will be described in detail with reference to FIG. 13.
- FIG. 13 is a diagram showing an example of log contents according to an embodiment of the present invention.
- interval t 1 to t 3 operates in the logging enabled state and a logging stop condition occurs between t 3 and t 4 .
- a logging resume condition occurred between t 5 and t 6 .
- the terminal performs MDT measurement logging during t 1 to t 3 intervals in which logging is allowed. Referring to the log history during the interval t 1 to t 3 , it can be seen that log entries including MDT measurements measured at the corresponding logging interval are continuously stored.
- the terminal Since the logging stop condition occurs after the time t 3, the terminal stops logging. However, the terminal logs information related to the state transition. Referring to the log history at time t 4 , it can be seen that the log history is logged with information related to the state transition of the terminal together with the previously logged log entries. In this case, the information related to the state transition may include an indicator indicating that the terminal has entered the logging stop state.
- the logging resume condition occurs because the UE resumes the logging.
- the terminal logs information related to the state transition.
- the information related to the additional state transition may include an indicator indicating that the terminal has entered the logging resume state.
- the terminal logs the MDT measurement at t 7 and t 8 , respectively.
- the time point at which the UE logs the information related to the state transition may be a state transition time or may be a logging time point scheduled according to the existing logging interval after the state transition.
- the information related to the state transition may further include a state transition reason and a state transition time point of the terminal in addition to the indicator indicating the state transition of the terminal.
- the state transition reason of the terminal may be at least one or more of the state transition conditions detected by the terminal in S1230.
- the UE logs state transition information in both the transition to the logging stop state and the transition to the logging enabled state, but this is merely an example.
- the terminal may be configured to log the state transition information only when the transition to the logging stop state or to log the state transition information only when the transition to the logging enabled state.
- the terminal reports the log to the network (S1260).
- the terminal reporting the log to the network may include the terminal sending a log availability indicator to the network and sending the log to the network in response to a report request from the network.
- network performance information such as a coverage map may be configured by referring to information related to stopping logging or resuming logging included in the log.
- FIG. 14 is a block diagram illustrating a wireless device in which an embodiment of the present invention is implemented. This device implements the operation of the terminal in the embodiment of Figures 7-13.
- the wireless device 1400 includes a processor 1410, a memory 1420, and a radio frequency unit 1430.
- the processor 1410 implements the proposed functions, processes, and / or methods.
- the processor 1410 switches between the RRC connected mode and the RRC idle mode, and measures the logged MDT based on the MDT setting.
- the processor 1410 detects a state transition condition, and transitions to the logging enabled state or the logging stop state according to the detected state transition condition.
- the processor 1410 may additionally log state transition information according to the logging state transition.
- the memory 1420 is connected to the processor 1410 and stores logging details including MDT settings, logged measurements, and state transition information. 7 to 13 may be implemented by the processor 1410 and the memory 1420.
- the RF unit 1430 is connected to the processor 1410 to transmit and receive a radio signal.
- the processor may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices.
- the memory may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and / or other storage device.
- the RF unit may include a baseband circuit for processing a radio signal.
- the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function.
- the module may be stored in memory and executed by a processor.
- the memory may be internal or external to the processor and may be coupled to the processor by various well known means.
Abstract
Description
Claims (15)
- 무선 통신 시스템에서 로그된 측정을 수행하는 방법에 있어서,
단말은 네트워크로부터 측정 설정(measurement configuration)을 수신하고,
단말은 MDT(Minimization of Driving Tests) 측정을 로깅하고,
단말은 상태 천이 조건 발생 여부를 감지하고,
단말은 상태 천이 조건이 발생하면 상태를 천이하고, 및,
단말은 상기 상태 천이와 관련된 상태 천이 정보를 로깅하는 것;을 포함하는 로그된 측정 수행 방법. - 제 1항에 있어서, 상기 발생된 상태 천이 조건이 로깅 중단 조건이면,
상기 상태를 천이하는 것은 로깅 중단 상태로 천이하는 것을 포함하는 것을 특징으로 하는 로그된 측정 수행 방법. - 제 2항에 있어서,
상기 상태 천이 정보는 상기 로깅 중단 상태로 천이하였음을 지시하는 지시자를 포함하는 것을 특징으로 하는 로그된 측정 수행 방법. - 제 3항에 있어서,
상기 상태 천이 정보는 상기 로깅 중단 조건을 더 포함하는 것을 특징으로 하는 로그된 측정 수행 방법. - 제 4항에 있어서,
상기 상태 천이 정보는 상기 단말이 상태 천이한 시점을 더 포함하는 것을 특징으로 하는 로그된 측정 수행 방법. - 제 5항에 있어서, 상기 로깅 중단 조건은,
상기 단말이 로깅하도록 설정된 RRC(radio resource control) 상태를 벗어나는 것,
상기 단말이 로깅하도록 설정된 RAT(Radio Access Technology)을 벗어나는 것,
상기 단말이 로깅 지역을 벗어나는 것,
상기 단말이 로깅 PLMN(Public Land Mobile Network)을 벗어나는 것,
상기 단말이 정규 캠핑(camped normally)상태를 벗어나는 것, 및,
상기 로그된 MDT 측정 및 상기 상태 천이 정보를 포함하는 로그 내역의 총 합이 특정 값에 다다르는 것 중 적어도 하나를 포함하는 것을 특징으로 하는 로그된 측정 수행 방법. - 제 2항에 있어서, 상기 발생된 상태 천이 조건이 로깅 재개 조건이면,
상기 상태를 천이하는 것은,
상기 단말은 로깅 가능 상태로 천이하고,
상기 단말은 MDT 측정을 로깅하는 것을 포함함을 특징으로 하는 로그된 측정 수행 방법. - 제 7항에 있어서,
상기 상태 천이 정보는 상기 로깅 가능 상태로 천이하였음을 지시하는 지시자를 포함하는 것을 특징으로 하는 로그된 측정 수행 방법. - 제 8항에 있어서,
상기 상태 천이 정보는 상기 로딩 재개 조건을 더 포함하는 것을 특징으로 하는 로그된 측정 수행 방법. - 제 9항에 있어서,
상기 상태 천이 정보는 상기 단말이 상태 천이한 시점을 더 포함하는 것을 특징으로 하는 로그된 측정 수행 방법. - 제 10항에 있어서, 상기 로깅 재개 조건은,
상기 단말이 로깅하도록 설정된 RRC(radio resource control) 상태에 진입하는 것,
상기 단말이 로깅하도록 설정된 RAT으로 진입하는 것,
상기 단말이 로깅 지역으로 진입하는 것,
상기 단말이 로깅 PLMN으로 진입하는 것, 및,
상기 단말이 정규 캠핑(camped normally)상태로 진입하는 것 중 적어도 하나를 포함함을 특징으로 하는 로그된 측정 수행 방법. - 제 1항에 있어서,
상기 단말은 주기적으로 상기 MDT 측정을 로깅하도록 설정된 것을 특징으로 하는 로그된 측정 수행 방법. - 제 1항에 있어서,
상기 단말은 이벤트 발생 기반으로 로깅을 수행하도록 설정된 것을 특징으로 하는 로그된 측정 수행 방법. - 제 1항에 있어서,
상기 단말이 상기 네트워크로부터 로그 내역 보고 요청을 수신하고 및,
상기 단말이 상기 보고 요청에 대한 응답으로 상기 로그된 MDT 측정 및 상기 상태 천이 정보를 포함하는 로그 내역을 상기 네트워크에게 전송하는 것을 더 포함하는 로그된 측정 수행 방법. - 무선 통신 시스템에서 로그된 측정을 수행하는 무선 장치에 있어서,
무선 신호를 송신 및 수신하는 RF(Radio Frequency) 부; 및,
상기 RF부와 연결되는 프로세서(processor)를 포함하되, 상기 프로세서는,
네트워크로부터 측정 설정(measurement configuration)을 수신하고,
MDT 측정을 로깅하고,
상태 천이 조건 발생 여부를 감지하고,
상태 천이 조건이 발생하면 상태를 천이하고, 및,
상기 상태 천이와 관련된 상태 천이 정보를 로깅하도록 설정된 것을 특징으로 하는 무선 장치.
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KR1020137008483A KR101860585B1 (ko) | 2010-10-10 | 2011-10-10 | 무선 통신 시스템에서 로그된 측정 수행 방법 및 장치 |
US14/919,862 US9936412B2 (en) | 2010-10-10 | 2015-10-22 | Method and device for performing a logged measurement in a wireless communication system |
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- 2011-10-10 GB GB1306692.3A patent/GB2497902B/en active Active
- 2011-10-10 GB GB1503958.9A patent/GB2520877B/en active Active
- 2011-10-10 WO PCT/KR2011/007463 patent/WO2012050323A2/ko active Application Filing
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2015
- 2015-10-22 US US14/919,862 patent/US9936412B2/en active Active
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Cited By (8)
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WO2015013192A1 (en) * | 2013-07-26 | 2015-01-29 | Intel IP Corporation | Network coverage hole detection |
US9265076B2 (en) | 2013-07-26 | 2016-02-16 | Intel IP Corporation | Network coverage hole detection |
US9775081B2 (en) | 2013-07-26 | 2017-09-26 | Intel IP Corporation | Network coverage hole detection |
WO2018030866A1 (ko) * | 2016-08-11 | 2018-02-15 | 삼성전자 주식회사 | 저전력 rrc 운용 방법 및 장치 |
US10917786B2 (en) | 2016-08-11 | 2021-02-09 | Samsung Electronics Co., Ltd. | Low power RRC operating method and device |
US11582603B2 (en) | 2016-08-11 | 2023-02-14 | Samsung Electronics Co., Ltd. | Low power RRC operating method and device |
CN109756923A (zh) * | 2017-11-02 | 2019-05-14 | 华为技术有限公司 | 移动性管理方法、装置及系统 |
CN109756923B (zh) * | 2017-11-02 | 2021-06-22 | 华为技术有限公司 | 移动性管理方法、装置及系统 |
Also Published As
Publication number | Publication date |
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GB201503958D0 (en) | 2015-04-22 |
GB2520877A (en) | 2015-06-03 |
KR20130132412A (ko) | 2013-12-04 |
US20160112893A1 (en) | 2016-04-21 |
WO2012050323A3 (ko) | 2012-06-07 |
US9185580B2 (en) | 2015-11-10 |
GB2497902A (en) | 2013-06-26 |
GB2497902B (en) | 2015-06-03 |
GB2520877B (en) | 2015-09-09 |
GB201306692D0 (en) | 2013-05-29 |
KR101860585B1 (ko) | 2018-06-29 |
US20130196604A1 (en) | 2013-08-01 |
US9936412B2 (en) | 2018-04-03 |
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