KR20120036659A - Method for obtaining information in wireless communication system and apparatus thereof - Google Patents

Abstract

PURPOSE: An information quantity method of a wireless communication system and an apparatus thereof are provided to efficiently measure wireless call quality with a wireless communication coverage. CONSTITUTION: A log setup request message is transmitted from network(S1110). The terminal configures a log environment according to MDT(Minimization Driving Test) setup parameter. The terminal changes an MDT operation mode according to set predetermined conditions(S1230,S1240). The terminal measures MDT in the MDT operation mode(S1250).

Description

Method and apparatus for collecting information in wireless communication system using MDT [Method For Obtaining Information In Wireless Communication System And Apparatus Thereof}

The present invention relates to a wireless communication technology, and more particularly, to an apparatus and method for configuring a driving environment (Minimization Driving Test (MDT)).

In order to increase the performance of a wireless communication system, a wireless communication network should always consider throughput, frequency efficiency, mobility, coverage, and enhancement of multimedia broadcast / multimedia service (MBMS). As wireless communication technologies have evolved, each of these factors affecting wireless communication networks has changed significantly.

For example, wireless communication systems generally use one bandwidth for data transmission, but vary in bandwidth for each mobile generation. For example, 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. To support the increasing transmission capacity, the recent Long Term Evolution (LTE) or IEEE 802.16m of the 3rd Generation Partnership Project (3GPP) continues to expand its bandwidth to 20 MHz or more.

As such, it is essential to increase the bandwidth in order to increase transmission capacity. However, except for some regions of the world, the allocation of a large bandwidth frequency is not easy due to the lack of frequency resources.

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.

In order to effectively operate the system while maintaining a high quality of service (QoS), the service provider should be aware of the local coverage of the network's coverage environment, such as intra-cell call quality or signal transmission and reception.

The present invention provides an apparatus and method for effectively measuring wireless call coverage and wireless call quality of mobile communications.

The present invention provides an apparatus and method for effectively measuring wireless call coverage and wireless call quality without having to measure the call quality in the coverage area while moving directly.

The present invention provides an apparatus and method for accurately and specifically measuring wireless call coverage and wireless call quality in mobile communications.

According to an aspect of the present invention, a method for collecting information using MDT in a wireless communication system includes transmitting a log setting request message for a minimization driving test (MDT) and requesting a log report.

The log setting request message may include an MDT setting parameter, and the MDT setting parameter may include a measurement object, a duration of the MDT measurement, a period of the MDT measurement, and a report of the log. The method may include parameters related to at least one of a scheme, a reporting period of a log, and a time of a base station.

In addition, the MDT configuration parameter included in the log configuration request message may include a parameter related to generation of a triggering event for initiating MDT measurement.

The information collecting method may further include determining whether it is necessary to change the MDT setting after transmitting the log setting request message. If it is determined that the MDT setting needs to be changed, a new MDT setting parameter may be configured and transmitted. Can be.

In another aspect of the present invention, a method for collecting information using MDT in a wireless communication system includes: setting a log environment based on a log setting request message, performing MDT and creating a log according to the set log environment, and creating a log; Reporting the logs.

The MDT may be any one of a periodic MDT mode, an event trigger MDT mode, and a mode in which a periodic MDT and an event trigger MDT are mixed.

The information collection method may further include a step of determining whether a change of the MDT mode is necessary before the log report step. If it is determined that the change of the MDT mode is necessary, the MDT mode is changed and information is collected according to the changed MDT mode. Each step of the method can be performed.

The log setting request message may include an MDT setting parameter, and the MDT setting parameter may include a measurement object, a duration of the MDT measurement, a period of the MDT measurement, and a report of the log. The method may include parameters related to at least one of a scheme, a reporting period of logs, and a time of a base station.

The MDT configuration parameter included in the log configuration request message may include a parameter related to generation of a triggering event for initiating MDT measurement.

According to the present invention, wireless call coverage and wireless call quality of mobile communication can be effectively measured.

According to the present invention, wireless call coverage and wireless call quality can be effectively measured without having to measure the call quality directly while moving the call area.

1 is a block diagram illustrating a wireless communication system.
2 is a block diagram illustrating functional division between an E-UTRAN and an EPC.
3 is a block diagram illustrating a radio protocol structure for a user plane.
4 is a block diagram illustrating a radio protocol architecture for a control plane.
5 is a conceptual diagram schematically illustrating a concept of a driving test.
6 is a conceptual diagram schematically illustrating a concept of a driving test minimization method.
7 is a flowchart schematically illustrating an MDT setting method.
8 is a conceptual diagram schematically illustrating an example of forming a log in periodic MDT.
9 is a flowchart schematically illustrating a method of setting an event trigger MDT.
FIG. 10 is a conceptual diagram schematically illustrating an example of creating a log in a mixture of a periodic method and an event trigger method.
11 is a flow chart that schematically illustrates the operation of a network for MDT measurement.
12 is a flowchart schematically illustrating an operation of a terminal for MDT measurement.
13 is a block diagram illustrating a wireless communication system in which an embodiment of the present invention is implemented.

Hereinafter, the present disclosure will be described in detail with reference to the accompanying drawings and examples in connection with the present disclosure. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible, even if displayed on different drawings. In addition, in describing the embodiments of the present specification, when it is determined that the detailed description of the related well-known configuration or function may obscure the subject matter of the present specification, the detailed description thereof will be omitted.

In addition, in describing the components of the present specification, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. If a component is listed as being “connected”, “coupled” or “connected” to another component, that component may be directly connected or connected to that other component, but there is another component between each component. It is to be understood that can be "connected", "coupled" or "connected".

In addition, the present invention will be described with respect to a wireless communication network. The work performed in the wireless communication network may be performed in a process of controlling a network and transmitting data by a system (e.g., a base station) Work can be done at a terminal connected to the network.

1 is a block diagram illustrating a wireless communication system. This may be a network structure of 3GPP LTE / LTE-A. The E-UTRAN (Evolved-UMTS Terrestrial Radio Access Network) includes a base station 20 (BS) that provides a control plane and a user plane to a user equipment (UE) 10. do.

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), and a wireless device. .

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.

One or more cells may exist in one base station 20. In this case, the cell should be interpreted as a comprehensive meaning representing a part of the area covered by the base station 11 and encompasses various coverage areas such as a mega cell, a macro cell, a micro cell, a pico cell, a femto cell, and a relay.

An interface for transmitting user traffic or control traffic may be used between the base stations 20. The base stations 20 may be connected to each other through an X2 interface.

The base station 20 is connected to a Mobility Management Entity (MME) through an Evolved Packet Core (EPC), more specifically, S1-MME through an S1 interface, and a Serving GateWay (S-GW) through S1-U. The S1 interface supports a many-to-many-relation between the base station 20 and the MME / SAE gateway 30.

Hereinafter, downlink means communication from the base station 20 to the terminal 10, and uplink means communication from the terminal 10 to the base station 20. In downlink, the transmitter may be part of the base station 20 and the receiver may be part of the terminal 10. In addition, in uplink, the transmitter may be part of the terminal 10 and the receiver may be part of the base station 20.

2 is a block diagram illustrating a functional split between an E-UTRAN and an EPC. The hatched box represents the radio protocol layer and the white box represents the functional entity of the control plane. Describe the function of each functional entity.

The base station performs the following functions.

(1) Radio resource management such as radio bearer control, radio admission control, connection mobility control, and dynamic resource allocation to a terminal ; RRM) function. (2) Internet Protocol (IP) header compression and encryption of user data streams. (3) Routing of user plane data to S-GW. (4) Scheduling and sending of paging messages. (5) Scheduling and transmission of broadcast information. (6) Set up measurements and measurement reports for mobility and scheduling.

The MME performs the following functions.

(1) Non-Access Stratum (NAS) signaling. (2) NAS signaling security. (3) idle mode UE Reachability, (4) tracking area list management. (5) Roaming Functions (6) Authentication.

S-GW performs the following functions.

(1) mobility anchoring. (2) lawful interception.

P-GW (P-Gateway) performs the following functions.

(1) Terminal IP (Internet Protocol) allocation. (2) packet filtering.

3 is a block diagram illustrating a radio protocol architecture for a user plane. 4 is a block diagram illustrating a radio protocol structure for a control plane. The data plane is a protocol stack for user data transmission, and the control plane is a protocol stack for control signal transmission.

3 and 4, a physical layer (PHY) provides an information transfer service to a higher layer by using a physical channel. The physical layer is connected to a medium access control (MAC) layer, which is a higher layer, through a transport channel.

Data travels between the MAC and physical layers over the transport channel. Transport channels are classified according to how and with what characteristics data is transmitted over the air interface. Data moves between physical layers, that is, between physical layers of a transmitter and a receiver. In the physical layer, a physical control channel may be used.

Physical Downlink Control CHannel (PDCCH) informs the UE of resource allocation of Paging CHannel (PCH) and DownLink Shared CHannel (DL-SCH) and Hybrid Automatic Repeat reQuest (HARQ) information related to DL-SCH.

The PDCCH may carry an uplink scheduling grant informing the UE of resource allocation of uplink transmission.

The Physical Control Format Indicator CHannel (PCFICH) informs the UE of the number of OFDM symbols used for PDCCHs and is transmitted every subframe.

PHICH (Physical Hybrid ARQ Indicator CHannel) carries a HARQ ACK / NAK signal in response to uplink transmission.

Physical Uplink Control CHannel (PUCCH) carries uplink control information such as HARQ ACK / NAK, scheduling request, and CQI for downlink transmission.

PUSCH (Physical Uplink Shared CHannel) carries UL-SCH (UpLink Shared CHannel).

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. The logical channel may be divided into a control channel for transmitting control region information and a traffic channel for delivering user region information.

Functions of the RLC layer include concatenation, segmentation, and reassembly of RLC SDUs.

In order to guarantee the various quality of service (QoS) required by the radio bearer (RB), the RLC layer uses a transparent mode (TM), an unacknowledged mode (UM), and an acknowledged mode. , Three modes of operation (AM). AM RLC provides error correction through Automatic Repeat reQuest (ARQ).

Functions of the Packet Data Convergence Protocol (PDCP) layer in the user plane include delivery of user data, header compression, and ciphering. Functions of the PDCP layer in the user plane include 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 the configuration, re-configuration and release of radio bearers.

RB refers to 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.

The RB can be divided into two types, a signaling RB (SRB) and a data RB (DRB). The SRB is used as a path for transmitting the RRC message in the control plane, and the DRB is used as a path for transmitting the user data in the user plane.

The non-access stratum (NAS) layer located above the RRC layer performs functions such as session management and mobility management.

On the other hand, the quality of each radio link changes rapidly and to some extent randomly within the cell of mobile radio communication, and this change must be considered in order to effectively operate the communication system.

A scheduler is one way to deal with this quality link change. The scheduler for the downlink is generally a round-robin scheduler in which terminals alternately use shared resources without considering the channel state, and the terminal with the absolute best downlink channel state is scheduled. -C / I scheduler (also known as maximum rate scheduler), a PF (Proportional-Fair) scheduler that allocates shared resources to the terminal with the highest radio link state but limits the long-term quality of service difference between terminals to a certain level or less. And the greedy filling scheduler, which is commonly used in non-orthogonal multiple access schemes.

Unlike the downlink in which the power resources are concentrated in the base station, in the uplink, the power resources are divided among the terminals. In addition, the maximum uplink transmission power of a single terminal is generally significantly lower than the output of the base station. In this regard, uplink scheduling may be different from downlink scheduling, but the above-described scheduling principles for downlink may also be applied to uplink.

Although there are various scheduling schemes, the scheduling algorithm or the scheduling strategy itself is generally a matter of (base station) implementation, so other standards, including 3GPP, do not specifically standardize it. However, almost all service providers attempt to effectively use radio resources in a cell while maintaining an appropriate quality of service (QoS) between users in base station construction and wireless communication system operation. Therefore, a terminal having a relatively advantageous channel condition by using a channel change between terminals while guaranteeing the same average user throughput for all terminals or a certain minimum user throughput for at least all terminals. Scheduling is the overall goal of most schedulers.

As such, there may be a significant gain in system capacity if the state of the channel is taken into account for scheduling. Scheduling according to channels is used in HSPA / HSUPA or LTE. In case of LTE, not only the channel change in the time domain but also the channel change in the frequency domain can be considered.

In case of scheduling according to the channel state in downlink, the terminal may transmit a channel-status report to the base station. The channel status report may include instantaneous channel quality in the time and / or frequency domain. In case of spatial multiplexing, information necessary for antenna processing may also be included in the channel status report.

The channel status report is a report regarding transmission settings and / or parameters determined by the terminal to be suitable for use when transmitting the DL-SCH to the corresponding terminal. The UE determines transmission configuration and / or parameters based on the downlink instantaneous channel state. The channel status report may be configured according to a setting, and may include one or more of the following indicators.

Rank indicator (RI) is an indicator transmitted only when the terminal supports spatial multiplexing, and provides information on the rank of the channel, that is, the number of layers desired to be used for downlink transmission to the terminal. do.

Precoder Matrix Indicator (PMI) is an indicator reported only when the UE is in a closed-loop spatial multiplexing mode and provides information on a precoder matrix that is desired to be used for downlink transmission. In this case, the reported precoder matrix is determined based on the number of layers reported through the rank indicator.

Channel-Quality Indicator (CQI) indicates a modulation scheme and coding rate that are desired to be used for downlink transmission.

The base station or network does not necessarily follow the manner in which these indicators recommand. For example, when the base station or the network follows the channel status report, the precoder only needs to confirm that the precoder setting indicated by the precoder matrix indicator is used for downlink transmission. If the base station or network does not follow the channel status report, information about the precoder used should be explicitly included in the downlink scheduling assignment.

In the case of LTE, the channel status report may be periodic or aperiodic. In aperiodic cases, when there is an explicit request from a base station or network, a channel status report is sent to the base station or network. The base station or the network may request a channel status report by including a flag for requesting a channel status report in an uplink scheduling grant or the like.

In the case of periodic channel status report, the channel status report is transmitted from the terminal to the base station or the network at a predetermined period. The above-mentioned different information, for example, rank indicator, precoder matrix indicator, channel quality indicator, etc., need not all be reported in the same period or the same number of times. In general, the periodic channel status report may be delivered to the base station or the network through the PUCCH physical channel.

Channel-based scheduling is generally used for downlink transmission, but channel-based scheduling may also be used for uplink transmission. In the case of scheduling according to the channel state in the uplink, a sounding reference signal (SRS) transmitted from each terminal may be generally used for estimating the channel quality at the base station.

As such, what is basically needed at the transmitting side is an estimate that reflects the channel state at the moment of transmission. That is, in order to schedule considering the instantaneous channel state, the instantaneous channel state information is required. However, the network must also know the state of communication within the cell for other purposes.

The terminal continuously or at a specific time point measures the communication quality of a serving cell currently providing a service and the communication quality of a neighbor cell around the serving cell.

The terminal transmits the communication quality of the measured cells to the network according to the requirements of the network, the terminal's own needs, or according to predetermined rules or instructions, and the network sends a handover command to the terminal based on the measured values reported by the terminal. You can also get off. In this way, the network can effectively support the mobility of the terminal by using the communication quality within and around the cell measured by the terminal.

However, in addition to being used to support the mobility of the terminal, the measurement values related to the communication environment of the network measured by the terminal may be used to construct and operate the network system.

In general, a network operator optimizes a network such as a base station or a cell environment by confirming whether a coverage is lost or coverage hold related to a wireless call quality or a cell radius of a terminal when constructing a wireless communication network. For example, the terminal may determine the location where the terminal can talk by identifying the strength of the base station signal, or the terminal may identify the location where the call becomes difficult due to the attenuation of the signal, thereby effectively coping with this. Alternatively, a measurement value of communication quality including signal strength of a base station may be used to identify a shaded area that is a location where a terminal cannot make a call and to solve the problem.

FIG. 5 is a conceptual diagram schematically illustrating a concept of a driving test for measuring wireless call quality and / or coverage using a vehicle. The network operator and the like move within the call area, that is, the cell, of the established base station 500 using the vehicle 510.

As can be seen in the movement path 520 of the vehicle 510, the vehicle 510 collects call quality in a corresponding region by using a terminal mounted while going through all possible places in the cell. The call quality in the cell varies due to various factors such as the layout of buildings 530 in the cell or the top and bottom of the terrain. For example, there may be callable areas 540 and 550, while there may be call shadowed areas 560. Furthermore, there may be regions 540 with good call quality, and regions 550 with poor call quality, among the callable areas.

In general, call quality may vary depending on the distance from the base station 500. For example, since the region 540 having a good call quality is closer to the base station 500 than the region 550 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 530, actual regional call quality may be different than expected. For example, it may be the same, located between the buildings, not far from the base station, but in the call shading area 560.

Therefore, in order to actually optimize the network, detailed information about the communication environment in the network is required. This requires a lot of time and manpower to drive the test wherever needed in the cell.

Considering how to measure the quality of the communication environment in a network without having to measure the call quality by moving all the possible areas in the cell directly through a vehicle or the like. That is, a method of measuring call quality in a network while minimizing driving test (Minimization Driving Test: MDT, hereinafter referred to as “MDT”) may be considered.

6 is a conceptual diagram schematically illustrating measuring a communication environment of a network, that is, wireless call quality and / or coverage using MDT.

Minimize the measurement of the call quality in the cell while moving directly to the vehicle, etc., and confirm the wireless communication environment and the coverage situation through the communication quality at various locations in the cell measured and reported by each terminal. Similar to the actual driving test by using the values measured by terminals scattered in various regions, the region where the terminal can make a call or the region where the terminal cannot make a call due to signal attenuation, etc. are similar to the actual driving test. I can figure it out.

Referring to FIG. 6, by using a plurality of terminals 600 interspersed in a cell to measure wireless call quality, the measurement vehicle 510 needs only to move a minimum path 560.

In addition to the measurements performed by the moving vehicle 510, measurements for the wireless environment are performed at multiple terminals in various places in the cell. Each terminal can measure the radio environment according to the current location according to the MDT configuration.

At this time, the information measured by the terminal for the MDT wireless environment is called a log. The terminal may continuously accumulate logs and store them in a new log form whenever the state of the wireless communication environment is measured. The terminal may transmit to the network or the base station that it currently has a log (Log) accumulated by performing the MDT. When the terminal receives the log information from the network or the base station, the terminal may transmit the log information to the network or the base station.

7 is a flowchart schematically illustrating an MDT configuration method. The network configures MDT setting parameters (S710). In this case, the network is not a simple network or a core network, but a concept including all of a base station eNB or a base station 3GPP UTRAN, LTE E-UTRAN, WCDMA UMTS. Hereinafter, in the present specification, the network may not be a simple network or a core network, but may be used as a concept including all of a base station eNB or a base station 3GPP UTRAN, LTE E-UTRAN, WCDMA UMTS, and the like. Therefore, the MDT configuration parameter may be configured at the base station, or the MDT configuration parameter may be configured at the base station.

The MDT configuration parameters configured in the network include the measurement object of MDT measurement, the duration of MDT measurement, the period of MDT measurement, the report method of log, the reporting period of log, the time of base station, etc. It may contain information about.

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 target 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 base station 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. In this regard, it may be set to perform the MDT measurement for a predetermined period and to terminate it, or may be set to perform the MDT measurement for a predetermined period periodically at regular intervals.

The network may set a method of transferring the result of the MDT measurement from the terminal to the network through a parameter related to a log reporting method. The reporting of the log information may take a manner in which the terminal reports the log information to the network when the network requests the report of the log to the terminal. The terminal may transmit to the network or the base station that it currently has a log accumulated through the MDT. The network may request the report of the log from the terminal after grasping the state of the log of the terminal received from the terminal. In addition, even if there is no explicit request from the network, after a certain time elapses after starting the MDT measurement, the terminal may take a method of reporting log information to the network. In addition, log information may be periodically reported at regular intervals.

When the network is configured to report the log information every fixed time, the network may set the report period of the log information through a parameter related to the report period of the log. In this case, the network may perform the MDT for each of the MDT measurement targets described above, and set a reporting period of log information differently for each MDT measurement target. In addition, the network may be configured to periodically report the log of some of the above-described MDT measurement targets, and some only to report when there is an explicit request from the network.

The network may set a reference time for the MDT measurement through a parameter regarding the time of the base station.

Although some parameters related to the MDT setting have been described herein, 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 log reporting method, 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, a parameter regarding how to handle the accumulated log has been reported. You can also set 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 base station includes the MDT setting value in a log configuration request message and transmits it to the terminal (UE) (S720). The log setting request message includes related information necessary for measuring the MDT in the terminal. 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 include the MDT setting parameters as described above, for example, a measurement object of MDT measurement, a duration of MDT measurement, a period of MDT measurement, a report method of log, a log of It may be configured according to the MDT configuration parameters such as the reporting period, the time of the base station.

The terminal UE may receive a log setting request message from the base station and set a log environment according to the MDT setting included in the received message (S730).

If log information is needed, the network may request log information from the terminal (S740). Upon receiving the log information request from the network, the terminal may create a log information report based on the created log (S750). Alternatively, the terminal stores the log obtained by logging according to the log setting request message and may use the stored log information as a log information report. Subsequently, the terminal may transmit the generated log information report to the network (S760). Here, the terminal has been described as delivering the log report to the network only when there is a log information request (request) from the network, the present invention is not limited to this, according to the preset conditions, the explicit log information request from the network Log information can be reported to the network even if it is not present.

8 is a conceptual diagram schematically illustrating an example of forming a log in periodic MDT.

Referring to FIG. 8, during the MDT measurement period T _on , 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.

In the example of FIG. 8, the MDT measurement period T _M is set to a multiple of the paging DRX cycle T _d . In order to reduce power consumption in the terminal reception circuit, LTE supports Discontinuous Reception (DRX), and HSPA, etc., corresponds to a Continuous Packet Connectivity (CPC) function. If a DRX cycle is specified, the UE observes downlink control signaling in one subframe per DRX cycle and maintains a sleep mode in another subframe. In periodic MDT, this DRX cycle can be used as a reference for setting MDT measurement cycle.

The terminal measures the network communication environment according to the MDT setting, and creates a log, which is measurement information. At every measurement, the log is continuously accumulated and stored in the terminal in a new log form. As shown in the example of the log shown in FIG. 8, a log number according to a measurement time point may be displayed in the log to distinguish each log, a timestamp for a value of a measured wireless communication environment and a measurement time, Measurement location information and the like. Herein, it has been described as including a measurement value, a time stamp, and location information for a wireless communication environment. However, the present invention is not limited thereto, and each log may include various information as necessary.

In the case of the periodic MDT periodically operated as described above, the terminal measures the network communication quality and creates / stores / manages logs according to the preset period during the preset period.

With this periodic MDT, one may consider using an MDT triggered by an event to more accurately determine the call quality in the cell.

9 is a flowchart schematically illustrating a method of setting an event triggered MDT (Event Triggered MDT).

The network sets the method of event trigger MDT (S910). In this case, the network is not a simple network or a core network, but a concept including all of a base station eNB or a base station 3GPP UTRAN, LTE E-UTRAN, WCDMA UMTS. Therefore, the parameters related to the MDT configuration may be configured at the base station or may be configured at the base station. The network may set the event trigger MDT to be set separately from the periodic MDT, or may set the event trigger MDT through the setting of the periodic MDT.

The parameter configured to set the event trigger MDT may include information about a type of triggering event. In addition, the parameter configured to set the event trigger MDT may include information about logging and / or reporting log information.

There can be various triggering events for the MDT measurement, and the network can select the desired triggering event from among them. For example, when the location information of the terminal is updated as an event that can use the event trigger MDT, the network state measured by the terminal changes, the operation of the terminal or the operation of the base station may be considered.

The network includes the event trigger MDT configuration parameter in a log configuration request message and transmits it to the UE (S920). The log setup request message may include an indicator to initiate an event trigger MDT measurement. In addition, the log setting request message may be an indicator for initiating event trigger MDT measurement. Here, the log setting request message has been described as including the event trigger MDT configuration parameter, but may be transmitted to the terminal by including the event trigger MDT configuration parameter in a message other than the log configuration request message. In addition, the network may configure and send a message including only the event trigger MDT configuration parameter to the terminal. When the network transmits the event trigger MDT configuration parameter, the network may separately notify the terminal of information about the transmission, if necessary.

The UE may set a log environment based on the message received from the base station (S930). If the received message includes only the parameters related to the event trigger MDT setting, a log environment based on the event trigger MDT setting may be set. If the received message is, for example, a log setting request message and includes a parameter related to the event trigger MDT setting, the log environment based on the MDT setting of the log setting request message is set and the log environment based on the event trigger MDT setting is set. Can be set.

If log information is needed, the network may request log information from the terminal (S940). Upon receiving the log information request from the network, the terminal may create a log report based on the created log (S950). Subsequently, the terminal delivers the generated log report to the network (S960). The log report may be final log information stored through the log set by the terminal.

Herein, the terminal transmits a log report to the network when there is a log information request from the network. However, the present invention is not limited thereto, and according to a preset condition, even if there is no explicit log information request from the network. Log information can be reported to the network.

The event trigger MDT performs MDT measurement according to the occurrence of the above-described triggering event. When the triggering event occurs, the terminal may perform the MDT measurement and log according to a predetermined predetermined rule or instruction. Or, when a triggering event occurs, MDT measurements and log generation may be made only when there is a clear request from the base station or the network.

In the event triggering MDT, when the network requests a report of the log to the terminal, the terminal may report the log information to the network in response thereto. In addition, even if there is no explicit request from the network, log information may be reported after a certain time after the MDT measurement.

On the other hand, as described above, there are various triggering events in which the network may require MDT measurement, and the network may select a desired triggering event from among them. Hereinafter, as an example of a triggering event, (1) the case where the location information of the terminal is updated, (2) the case where the network state measured by the terminal changes, and (3) the case where the operation of the terminal or the operation of the base station fails.

(1) When the location information of the terminal is updated.

Methods for determining the location of the terminal can be largely divided into a network-based method and a handset-based method. The basic principles of the positioning method of the network-based method are Time Difference of Arrival (TDOA), Angle of Arrival (AOA) and RF Fingerprint (RF Fingerprint). There is a Time of Arrival (TOA) using a Global Positioning System (GPS). There is also a hybrid positioning method that combines the basic principles of such a positioning method.

The positioning method based on Observed TDOA (OTDOA), which measures the position by observing the relative difference of the radio wave arrival time from two signal sources, has been standardized. In LTE, a positioning method using an LTE Positioning Protocol (LPP) is used. In WCDMA, the position of the terminal can be confirmed using the terminal positioning method.

The terminal may have a connection or session for receiving location information or location update information, such as a network that provides a service based on position or positioning. Here, the network may be a server of a base station and / or location based service.

When the location information of the terminal changes, such as when the location is changed due to movement or the location information is newly received by the location information service, the terminal may acquire the changed location information through the above-described connection setting. do.

When the location information of the terminal is changed, the terminal may report this as a triggering event for MDT measurement and perform MDT measurement. The terminal performing the MDT measurement creates a log of the measured information. The log may include location information and time stamp at the time of measurement.

When the change of the location information is used as a triggering event, the terminal notifies the network, and receives a message including a parameter about the location information change as a parameter related to event triggering MDT setting from the network and performs MDT measurement. .

In addition, the MDT measurement may be performed using the location information change as a triggering event without receiving a message including a parameter regarding the location information change from the network. In this case, the network may transmit only an instruction to use the location information change as a triggering event instead of a parameter related to the location information change to the terminal so that the MDT measurement is performed.

In addition, when there is a predetermined rule or instruction between the terminal and the base station or between the terminal and the network that there is a change in the location information, the terminal acquires the change information of the location information and performs MDT measurement. It may be.

(2) triggering events based on measurements

The terminal continuously detects a wireless communication state such as signal strength or signal quality provided from the base station through measurement for a predetermined time or in a specific situation. Based on the continuous signal measurement operation of the terminal, the terminal or the network can identify a specific situation occurring in the terminal, and set the specific situation as a triggering event to perform MDT measurement and log the measured value as a log. I can write it. Which situation to view as the triggering event may be set in advance between the terminal and the network.

For example, the terminal may measure whether a triggering event occurs continuously using a DRX cycle. As shown in FIG. 8, when the period of measurement for the triggering event is set to a multiple of the DRX period, the terminal determines whether a condition that the triggering event has occurred is satisfied every time the triggering event is checked, and triggering is performed. When it is determined that an event has occurred, an event triggered MDT log may be generated. In this case, as a condition for determining that the triggering event has occurred, various values such as a threshold or an offset with respect to the preset triggering event may be used.

As a triggering event based on measurements, one can think of a change in the communication state of the network. The terminal may determine whether the measured value of the state of the network measured by the terminal, etc. is smaller or larger than a predetermined threshold value, and may be used as a condition for generating a triggering event for a network communication state change.

Hereinafter, when a measurement value for a network state of a serving cell or the like becomes larger than a predetermined threshold value, a value that is smaller than a predetermined threshold value and a difference that is larger than a predetermined offset in comparison with a measurement value for a neighboring cell are examples of triggering events. Explain.

-Triggering event 1: When the measured value of the network status is larger than the predetermined threshold

The case where the measured value measured by the terminal regarding the network state or the like is larger than the predetermined threshold will be described as the triggering event 1. In this case, event triggered MDT configuration parameters include an event type, a threshold of the corresponding event type, a hysteresis value of the corresponding event type, and the like.

If the measured value is larger than the preset threshold value, it may be determined that the triggering event 1 has occurred.

Triggering event 1 may be used in various cases. For example, when the event type is a change in signal strength, the signal strength is measured by the mobile terminal, so that the boundary of the signal strength is changed from an area where the signal strength is weaker to an area where the signal strength is greater than or equal to a predetermined value, that is, a wireless communication network. Or it may be used to check the coverage of the cell. As such, if the event type is a change in signal strength, the predetermined signal strength may be set as a threshold, and whether or not a triggering event is generated may be determined by comparing the threshold and the measured value.

The event trigger MD configuration parameter, for example, an event type, a threshold value of the corresponding event type, a hysteresis value of the corresponding event type, and the like may be set in a network (base station or control station).

Triggering Condition 1 describes the triggering conditions.

(a) M _s ≥ Thresh or M _s > Thresh

In this case, M _s may be, for example, a reference signal received power (RSRP) or a reference signal received quality (RSRQ) as a measurement value of the corresponding event type for the serving cell, and Thresh is a corresponding event. The threshold for the type. In the case of the triggering condition (a), when the M _s value is greater than or equal to the threshold value, or when the M _s value is greater than the threshold value, the triggering event 1 is considered to have occurred.

(b) M _s -Hys> Thresh: Start event triggering

M _s + Hys <Thresh: End event triggering

In this case, M _s may be, for example, a reference signal received power (RSRP) or a reference signal received quality (RSRQ) as a measurement value of the corresponding event type for the serving cell, and Thresh is a corresponding event. The threshold for the type. Hys is the hysteresis value for that event type.

When using the triggering condition (b), M _s Value and If the difference between the hysteresis value is greater than Thresh, the event triggering starts. If the sum of the M _s value and the hysteresis value is smaller than Thresh, the event triggering ends.

-Triggering event 2: When the measured value of the network status is smaller than the predetermined threshold

The case where the measured value measured by the terminal regarding the network state or the like is smaller than the predetermined threshold will be described as the triggering event 2. FIG. In this case, event triggered MDT configuration parameters include an event type, a threshold of the corresponding event type, a hysteresis value of the corresponding event type, and the like.

When the measured value is larger than the preset threshold value, it may be determined that the triggering event 2 has occurred.

Triggering event 2 may be used in various cases. For example, when the event type is a change in signal strength, the signal strength is measured by a moving terminal, so that the boundary of the signal strength is changed from an area where the signal strength is strong to an area where the signal strength is less than or equal to a predetermined value, that is, a wireless communication network or the corresponding. It may be used to check the coverage of the cell. As such, if the event type is a change in signal strength, the predetermined signal strength may be set as a threshold, and whether or not a triggering event is generated may be determined by comparing the threshold and the measured value.

The event trigger MD configuration parameter, for example, an event type, a threshold value of the corresponding event type, a hysteresis value of the corresponding event type, and the like may be set in a network (base station or control station).

Triggering condition will be described in Triggering Event 2.

(a) M _s ≤ Thresh or M _s <Thresh

In this case, M _s may be, for example, a reference signal received power (RSRP) or a reference signal received quality (RSRQ) as a measurement value of the corresponding event type for the serving cell, and Thresh is a corresponding event. The threshold for the type. In the case of the triggering condition (a), it is assumed that the triggering event 2 occurs when the M _s value is smaller than or equal to the threshold value, or when the M _s value is smaller than the threshold value.

(b) M _s + Hys <Thresh: Start event triggering

M _s -Hys> Thresh: Event triggering ends

In this case, M _s may be, for example, a reference signal received power (RSRP) or a reference signal received quality (RSRQ) as a measurement value of the corresponding event type for the serving cell, and Thresh is a corresponding event. The threshold for the type. Hys is the hysteresis value for that event type.

When using the triggering condition (b), M _s Value and Event triggering starts when the sum of hysteresis values is smaller than Thresh. Event triggering ends when the difference between M _s value and hysteresis value is larger than Thresh.

-Triggering event 3: When the measured value regarding the network state and the like difference from the measured value for the neighbor cell (Neighbor cell) by more than a predetermined offset

A case in which the measured value measured by the terminal regarding the network state or the like is different from the measured value for the neighbor cell by more than a predetermined offset will be described as the triggering event 3. In this case, the event triggered MDT configuration parameter may include an event type, a predetermined offset value of a measurement of neighbor cells with respect to the corresponding event type, and the like.

The triggering event 3 may be used as an event for identifying a position and a time point at which the UE handovers from the serving cell to the neighboring cell. The event can be triggered if it is greater than the offset. For example, an event may be triggered when a measurement value regarding a network state measured while the terminal moves, for example, a measurement value for a strength of a radio signal is larger than that of a current serving cell.

The event trigger MD configuration parameter, for example, the event type, a predetermined offset value for the measurement of neighbor cells with respect to the corresponding event type, and the like can be set in the network (base station or control station) or the like.

Triggering condition is explained in triggering event 3.

(a) M _n ≥ M _s + Offset or M _n > M _s + Offset

In this case, M _s may be, for example, a reference signal received power (RSRP) or a reference signal received quality (RSRQ) as a measurement value of a corresponding event type for the serving cell, and M _n is M _The neighbor cell's measurement for the same event type as _s . In addition, Offset is a predetermined offset value for the corresponding event type. If the triggering condition (a), the M _n values are considered as occurred in this case is greater than the offset value, than M _s or greater, or a M _n value is greater if the triggering event 3+ offset value than M _s.

(b) M _n -Hys> M _s + Offset: Event start

M _n + Hys <M _s + Offset: End event

In this case, M _s may be, for example, a reference signal received power (RSRP) or a reference signal received quality (RSRQ) as a measurement value of a corresponding event type for the serving cell, and M _n is M _The neighbor cell's measurement for the same event type as _s . In addition, Offset is a predetermined offset value for the corresponding event type, and Hys is a hysteresis value for the corresponding event type.

In the case of using a triggering condition (b), M _n value and Hysteresis (hysteresis) of the difference value is greater than the sum of the event triggering the start value and the Offset M _s, M _n value and If the sum of hysteresis values is smaller than the sum of M _s values and the offset value, the event triggering is terminated.

An example of an event that triggers a measurement of the network state of a serving cell or the like becomes larger than a predetermined threshold, a case in which the measurement becomes smaller than a predetermined threshold, and a difference that is greater than a predetermined offset compared to the measurement for a neighboring cell. As described above, the triggering event that can be used in the event triggered MDT method is not limited to this, and event trigger MDT measurement may be performed using various triggering events.

As described above, the MDT setting method can be largely divided into a periodic MDT method and an event triggered MDT method. In general, MDT uses a periodic MDT scheme. In addition, when it is necessary to more specifically understand the network environment according to a specific situation of the terminal or the network, the event trigger MDT method may be used. The periodic MDT method and the event trigger MDT method may be used alone or in combination. Therefore, in operating the MDT method, the MDT operation mode of the terminal may be divided into three modes as follows.

(1) Periodic (Type 1)

(2) Event triggered method (type 2)

(3) Mixed method of periodic method and event trigger method (Type 3)

The MDT operation mode may be set by the network in the MDT setting process. The network may transmit to the terminal which MDT operation mode should be set. In addition, the network may instruct to change only the set value while maintaining the same MDT mode of operation.

For example, in FIG. 7 and / or 9, the network configures the MDT parameter (S710) or sets the event trigger MDT scheme (S910), selects the MDT operation mode, and transmits information on this to the terminal or requests log setting. It may be included in a message and delivered to the terminal.

When the network determines that the MDT operation mode needs to be changed during or after the MDT measurement, or before and after the MDT measurement, the network configures a new MDT setting related parameter and includes the same in a log configuration request message. UE).

In addition, the network may configure a new MDT configuration parameter and transmit it to the terminal separately. In addition, when a specific situation occurs or a certain condition is satisfied according to a predetermined preset rule or indication, the terminal may change the MDT operation mode without an explicit indication from the network. Here, the predetermined preset rule or instruction may be included in the initial log setting request message and transmitted from the network to the terminal, or may be transmitted to the terminal when it is determined that a new condition or setting is necessary.

As described above, the MDT operation mode may be any one of operation modes classified as Type 1: Periodic Only, Type 2: Event Trigger Only, Type 3: Mixing of Periodic and Event Trigger. It can be one.

In this case, the network may configure information indicating any one of these three types and transmit the information to the terminal separately or include the information in the MDT mode of the log setting request message and transmit the information to the terminal. Upon receiving the information on the MDT operation mode, the UE may set a log environment according to the corresponding MDT operation mode (see S730 and S930) and perform MDT measurement.

The above-described three MDT operation modes may be newly set as needed, or may be changed while the MDT measurement is in progress or before and after the MDT measurement.

Type 2 can be changed during or after MDT measurements with Type 1 or before or after MDT measurements. The terminal may end the periodic MDT configuration and perform the MDT measurement when a predetermined triggering event occurs.

Type 1 can be changed during or after MDT measurements with Type 1 or before or after MDT measurements. The terminal may perform the MDT measurement when a predetermined triggering event occurs while continuing the MDT measurement according to the periodic MDT setting.

Type 1 can be changed during or after MDT measurements with Type 2 or before or after MDT measurements. The terminal may terminate the event trigger MDT configuration and perform the MDT measurement according to the periodic MDT configuration.

The type 2 can be changed during or after the MDT measurement. The UE may perform the MDT measurement when the triggering event occurs according to the event trigger MDT setting, and may perform the MDT measurement according to the periodic MDT setting.

Type 1 can be changed during or after MDT measurements with Type 3 or before or after MDT measurements. The terminal may terminate the event trigger MDT configuration and the periodic MDT configuration, and perform the MDT measurement according to the new periodic MDT configuration. In addition, the terminal may terminate the event trigger MDT configuration only, and may perform the MDT measurement while maintaining only the periodic MDT configuration. The new periodic MDT setting may be the same as the existing periodic MDT setting. The new periodic MDT setting may be different from the existing periodic MDT setting.

Type 2 can be changed during or after MDT measurements with Type 3 or before or after MDT measurements. The terminal may terminate the event trigger MDT configuration and the periodic MDT configuration, and perform the MDT measurement according to the new event trigger MDT configuration. In addition, the terminal may terminate the periodic MDT configuration only, and may perform the MDT measurement while maintaining only the event trigger MDT configuration. The new event trigger MDT setting may be the same as the existing event trigger MDT setting. The new event trigger MDT setting may differ from the existing event trigger MDT setting.

Herein, a change in the MDT operation mode, that is, a case in which the MDT type is changed has been described. However, only the MDT setting may be changed while maintaining the same type.

FIG. 10 is a conceptual diagram schematically illustrating an example of creating a log in a mixture of a periodic method and an event trigger method.

Referring to FIG. 10, the terminal performs measurement for a network communication environment according to a periodic MDT setting at every measurement time point T ₁ to T ₅ , according to the MDT measurement period T _M , during the MDT measurement period T _on . Can be done. 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 measurement period of the periodic MDT can be set variously as needed. In the example of FIG. 10, the measurement period T _M of the periodic MDT is set as a multiple of the paging DRX cycle T _d .

The terminal 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, the log is continuously accumulated and stored in the terminal in a new log form. As can be seen in the example of the log shown in FIG. 10, the log includes a log number for distinguishing the log at each measurement, and a timestamp for the value and measurement time of the measured wireless communication environment, measurement time information, and the like. May be included. Herein, it has been described as including a measurement value, a timestamp, and location information for a wireless communication environment. However, the present invention is not limited thereto, and a log may include various information as necessary.

When the event is triggered, the terminal may measure the network communication environment according to the event triggered MDT setting, and create a log thereof. The log may be configured differently according to the type of triggering event. For example, when the triggering event is a change in the location information of the terminal, the log for the event trigger MDT may include the location information of the terminal and a time stamp at the time of measurement.

Logs for periodic MDTs and event triggers The logs for MDTs can be created / stored / managed / reported according to different settings in the terminal. In addition, the terminal may perform a log for the periodic MDT and the creation / storage / management / reporting of the log for the event trigger MDT according to some or all the same settings as necessary. For example, in case of the periodic MDT, if there is an explicit report request from the network, the event trigger MDT may report the log information to the network if a predetermined condition is satisfied even if there is no explicit report request from the network. It may be. In addition, in case of an event triggered MDT, the network may report to the network if there is an explicit report request, and in the case of a periodic MDT, log information may be reported to the network if a predetermined condition is satisfied without the network's explicit report request. have.

11 is a flow chart that schematically illustrates the operation of a network for MDT measurement.

The network configures MDT setting parameters (S1110). In case of periodic MDT, the MDT configuration parameter is a measurement object of MDT, duration of MDT measurement, period of MDT measurement, report method of log, report period of log, time of base station And the like may be included. In addition, in the event trigger MDT, the MDT configuration parameter may include a type of a triggering event, information on logging, and / or reporting log information.

The network transmits a log setting request message including the MDT setting parameter (S1120). The network may determine whether it is necessary to change the MDT operation mode during the MDT measurement or before or after the MDT measurement (S1130). If it is determined that the change of the MDT operation mode is necessary, the network instructs the terminal to change the MDT operation mode (S1140). The instruction to change the MDT operation mode may be performed by creating and transmitting a new log setting request message or by transmitting a separate message to the terminal.

In relation to the change of the MDT operation mode, the changed MDT configuration may be delivered to the terminal by configuring a new MDT configuration parameter by the network and including the new MDT configuration parameter in a log configuration request message. . In addition, a new MDT configuration parameter may be configured by the network, and the new MDT configuration parameter may be transmitted to the terminal separately from the log configuration request message. In addition, the terminal may be configured to change the MDT setting according to a predetermined preset rule or indication. The predetermined rule or instruction may be included in the first log setting request message and transmitted from the network to the terminal, or may be transmitted to the terminal when the network determines that a new condition or setting is necessary.

In the present description, the network determines whether it is necessary to change the MDT operation mode, and accordingly, the instruction for changing the MDT operation mode has been described as being transmitted to the terminal. However, the present invention is not limited thereto, and the network uses one MDT operation mode. It is also possible to make MDT measurements.

After the MDT measurement is completed or while the measurement of the periodic MDT is being performed, the network may request a log report from the terminal (S1150), and if the terminal transmits a log report in response to the log report request (S1160). . Herein, the network explicitly requests and receives a log report from the terminal, but the present invention is not limited thereto, and the network is not limited to this. When the condition is satisfied, the log report may be received from the terminal.

12 is a flowchart schematically illustrating an operation of a terminal for MDT measurement.

The terminal receives a log setting request message from the network (S1210). In case of periodic MDT, the MDT configuration parameter is a measurement object of MDT, duration of MDT measurement, period of MDT measurement, report method of log, report period of log, time of base station And the like may be included. In addition, in the event trigger MDT, the MDT configuration parameter may include a type of a triggering event, information on logging, and / or reporting log information.

The terminal configures a log environment according to the MDT configuration parameter (S1220). For example, the terminal configures an environment in which the MDT measurement can be performed and logged according to the MDT configuration parameter.

Subsequently, the terminal may determine whether there is an instruction for changing the operation mode from the network or when a predetermined condition is achieved regarding the MDT operation mode change (S1230). If it is determined that the MDT operation mode needs to be changed, the MDT operation mode may be changed according to an instruction from the network or a predetermined condition set in advance (S1240).

Regarding the change of the MDT operation mode, the changed MDT setting is obtained by configuring a new MDT configuration parameter by the network and transmitting the new MDT configuration parameter to the UE by being included in a Log Configuration Request message. May be In addition, a new MDT configuration parameter may be configured by the network, and the new MDT configuration parameter may be transmitted to the terminal separately from the log configuration request message. In addition, the terminal may be configured to change the MDT setting according to a predetermined preset rule or indication. The predetermined rule or instruction may be included in the first log setting request message and transmitted from the network to the terminal, or may be transmitted to the terminal when the network determines that a new condition or setting is necessary.

The terminal performs MDT measurement in the corresponding MDT operation mode and creates / stores / manages a log (S1250). If the periodic MDT and the event trigger MDT is mixed, the terminal may create / store / manage / report the log for the periodic MDT and the log for the event trigger MDT according to different settings. In addition, the terminal may perform a log for the periodic MDT and the creation / storage / management / reporting of the log for the event trigger MDT according to some or all of the same settings as necessary.

After the MDT measurement and the creation / storage / management of the log, the terminal may determine whether to change the MDT operation mode again (S1260). When it is determined that the MDT operation mode needs to be changed, the MDT operation mode may be changed (S1240), and MDT measurement and log writing / storing / management may be performed accordingly (S1250).

Herein, the UE determines whether to change the MDT operation mode and explains that the MDT operation mode is changed accordingly. However, the present invention is not limited thereto, and the UE may perform MDT measurement while maintaining one MDT operation mode.

The terminal receives an MDT log reporting request from the network (S1270), and correspondingly transmits an MDT log report to the network (S1280). Although the present invention has been described as receiving a log report request from the network and correspondingly delivering the log report, the present invention is not limited thereto, and the terminal is not limited to an explicit log report request from the network according to a predetermined rule or instruction. A log report may be sent to the network when certain conditions are met.

13 is a block diagram illustrating a wireless communication system in which an embodiment of the present invention is implemented.

The base station 1300 includes a processor 1310, a memory 1320, and an RF unit 1330.

The processor 1310 implements the proposed functions, processes, and / or methods. Layers of the air interface protocol may be implemented by the processor 1330. The processor 1330 may configure MDT setting parameters and write a log setting request message. In addition, the processor 1330 may determine whether the MDT operation mode needs to be changed, and accordingly, may generate a message instructing the terminal to change the MDT operation mode. If it is determined that the log information is required, the processor 1330 may create a message requesting the log information from the terminal, and may process a log report transmitted from the terminal in response thereto.

The memory 1320 is connected to the processor 1310 and stores various information for driving the processor 1310. In relation to the MDT measurement, the memory 1320 may store, for example, a predetermined condition, rule or instruction set with the terminal. In addition, the memory 1320 may store a log report received from the terminal.

The RF unit 1330 is connected to the processor 1310 and transmits and / or receives a radio signal. The RF unit 1330 may transmit a log setting request message, a message instructing to change the MDT operation, and the like written by the processor 1310 to the terminal. In addition, the RF unit 1330 may receive a log information report transmitted by the terminal.

The terminal 1340 may include an RF unit 1350, a memory 1360, a controller 1370, a signal measuring unit 1380, a log generator 1390, and the like. The controller 1370 implements the proposed function, process, and / or method. Layers of the air interface protocol may be implemented by the controller 1370. The controller 1370 may configure a log environment for measuring MDT according to the MDT configuration parameter received from the base station. In the event trigger MDT, the controller 1370 may determine whether a triggering event occurs.

The memory 1360 is connected to the controller 1370 and stores various information for driving the controller 1370. The memory 1360 may store / manage logs generated by MDT measurement.

The RF unit 1350 is connected to the control unit 1370 and transmits and / or receives a radio signal. The RF unit 1350 may receive a log setting request message or a message instructing to change the MDT operation mode from the base station, and may transmit a log information report prepared therein.

The signal measuring unit 1380 may be connected to the control unit 1370 to perform MDT measurement according to the MDT setting. The log generator 1390 may be connected to the controller 1370 to create a log according to the MDT measurement value measured by the signal measurer 1380.

The processor 1310 and the controller 1370 may include an application-specific integrated circuit (ASIC), another chipset, a logic circuit, and / or a data processing device. The memories 1320 and 1360 may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage media, and / or other storage devices. The RF unit 1330 and 1350 may include a baseband circuit for processing a radio signal.

When the embodiment is implemented in software, the above-described techniques may be implemented as modules (processes, functions, etc.) for performing the above functions. The module may be stored in the memories 1320 and 1360 and executed by the processor 1310 and the controller 1370. The memories 1320 and 1360 may be inside or outside the processor 1310 and the controller 1370, and may be connected to the processor 1310 and the controller 1370 by various well-known means.

In the exemplary system described above, the methods are described based on a flowchart as a series of steps or blocks, but the invention is not limited to the order of steps, and certain steps may occur in a different order or concurrently with other steps than those described above. Can be. In addition, those skilled in the art will appreciate that the steps shown in the flowcharts are not exclusive and that other steps may be included or one or more steps in the flowcharts may be deleted without affecting the scope of the present invention.

The above-described embodiments include examples of various aspects. While it is not possible to describe every possible combination for expressing various aspects, one of ordinary skill in the art will recognize that other combinations are possible. Accordingly, it is intended that the invention include all alternatives, modifications and variations that fall within the scope of the following claims.

Claims (9)

An information collection method using MDT in a wireless communication system,
Transmitting a log setting request message for a minimization driving test (MDT); And
Requesting a log report. The method of claim 1, wherein the log setting request message includes an MDT setting parameter,
The MDT configuration parameter may be set to at least one of a measurement object of MDT measurement, a duration of MDT measurement, a period of MDT measurement, a report method of log, a report period of log, and a time of a base station. Information collection method comprising a related parameter. The method of claim 1, wherein the log setting request message includes an MDT setting parameter,
And the MDT configuration parameter comprises a parameter relating to the occurrence of a triggering event initiating MDT measurement. The method of claim 1, wherein the information collection method is
After sending the log setting request message, determining whether the MDT setting needs to be changed;
If it is determined that the MDT setting needs to be changed, the information collection method comprising configuring and transmitting a new MDT setting parameter. An information collection method using MDT in a wireless communication system,
Setting a log environment based on a log setting request message;
Performing MDT and creating a log according to the set log environment; And
And reporting the created log. The method of claim 5, wherein the MDT is one of a periodic MDT mode, an event trigger MDT mode, and a mode in which a periodic MDT and an event trigger MDT are mixed. The method of claim 6, wherein the information collection method,
Before the log report step, further comprising the step of determining whether the change of the MDT mode is necessary,
And when it is determined that the MDT mode needs to be changed, changing the MDT mode and performing each step of the information collection method according to the changed MDT mode. The method according to claim 5, wherein the log setting request message includes an MDT setting parameter,
The MDT configuration parameter may be set to at least one of a measurement object of MDT measurement, a duration of MDT measurement, a period of MDT measurement, a report method of log, a report period of log, and a time of a base station. Information collection method comprising a related parameter. The method according to claim 5, wherein the log setting request message includes an MDT setting parameter,
And the MDT configuration parameter comprises a parameter relating to the occurrence of a triggering event initiating MDT measurement.

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