WO2016161771A1

WO2016161771A1 - Minimization of drive test method and device

Info

Publication number: WO2016161771A1
Application number: PCT/CN2015/089743
Authority: WO
Inventors: 杨立; 李大鹏
Original assignee: 中兴通讯股份有限公司
Priority date: 2015-04-10
Filing date: 2015-09-16
Publication date: 2016-10-13
Also published as: CN106162708A

Abstract

A minimization of drive test (MDT) method and device. The method comprises: receiving, by a user equipment (UE), an activation or reconfiguration command for removing or reducing local interference of an MDT measurement; in a process of MDT measurement by the UE, if the UE detects that a signal of local interference meets a predetermined condition when the UE is ready to record any one of MDT sampling values, performing a predetermined process on an MDT sampling value ready to be recorded. The technical solution of the present invention can reduce an impact of the local interference of a UE on the precision of an MDT measurement result.

Description

Minimization road test method and device

Technical field

This paper relates to the field of minimizing drive test technology, and more particularly to a method and device for minimizing drive test.

Background technique

FIG. 1 is a schematic diagram of a system architecture of a Long Term Evolution (LTE) system in a 3GPP (3rd Generation Partnership Project) cellular mobile family system, including: a mobility management entity (MME, Mobility Management Entity) on a core network side, A service gateway (SGW, Serving GetWay), a user equipment on the radio access network side, or a terminal (UE, User Equipment) and a base station (eNodeB, eNB for short), between which are Uu air interfaces or air interfaces, eNBs. Between the MME and the MME is an S1-MME (S1 for the control plane) interface. The eNB and the SGW are S1-U interfaces, and between the eNBs are X2-U (X2-User plane) and X2-C (X2-Control plane). interface.

2(a) to 2(d) are a protocol stack structure of a control plane and a user plane between a UE and an eNB, a core network (MME and SGW) in an LTE system, and a control plane and a user plane between the eNB and the eNB. Schematic diagram of the protocol stack architecture. The Uu air interface media access control layer (MAC) and the physical layer (PHY, physical layer) protocol are the relevant parts of the subsequent content of this paper. The MAC layer mainly provides data transmission for the upper logical channel and is responsible for the allocation of uplink and downlink radio resources, and completes hybrid automatic repeat request (HARQ, Hybrid ARQ), scheduling (Scheduling), priority processing, and multiplexing demultiplexing (MUX, Multiplexing). And other functions; the PHY layer mainly provides physical layer related signal processing, transmission means and air interface signal conversion for the packet MAC PDU from the transmission channel. In addition, the protocol RLC (Radio Link Control) layer of the Uu air interface is mainly used to provide segmentation and retransmission services for users and control data. The Packet Data Convergence Protocol (PDCP) layer is mainly used for the PDCP (Packet Data Convergence Protocol) layer. The RRC (Radio Resource Control) or the user plane completes the transmission of user data; the RRC layer is mainly used to complete broadcast, paging, radio resource control connection management, radio bearer control, mobility Features, terminal measurement reports and controls. The above background art can query the relevant protocol specifications of LTE in the 3GPP public website.

In order to reduce the cost and complexity of mobile operators using manual devices for manual network test, the LTE system introduced a series of Minimization of Drive Test (MDT) functions starting from the Rel-10 version. The MDT automatically collects the network-related measurement results by using the normal LTE terminal, and then reports the information to the eNB through the control plane (Control Plane) signaling, and further reports the tracking to the Operation and Maintenance System (OAM) through the upstream interface of the eNB. The Trace Collection Entity (TCE) is used for network deployment and adjustment and optimization of operating parameters. For example, MDT can detect weak coverage of certain network areas, blind spot problems, and can find some hotspot areas with large capacity requirements.

The MDT function is classified into Management Based MDT (Management Based MDT) and Signaling Based MDT (Signaling Based MDT). The activation process of the management-based MDT is generally that the OAM sends a Trace Session activation message including the MDT configuration to the eNB, and the eNB selects an appropriate UE in the MDT Valid Area, and configures the MDT. The information is sent to the selected UE. The activation process of the signaling-based MDT is to send, by the OAM, a Trace Session activation message including an MDT configuration to a Home Subscriber Server (HSS) to activate the MDT measurement of the designated UE, and the HSS will use the UE. The MDT configuration information is sent to the MME, and the MME sends the MDT configuration information of the UE to the eNB, and the eNB finally sends the MDT configuration information to the UE. The signaling-based MDT usually uses an International Mobile Subscriber Identity (IMSI) or an International Mobile Station Equipment Identity (IMEI) to designate a certain UE, or add area information. Limit the choice of the UE. Both the management-based MDT and the signaling-based tracking activation message include Trace Reference information from the OAM, including the Public Land Mobile Network (PLMN) information, and the mobile country code ( Mobile country code (referred to as MCC) and mobile network code (Mobile Network code, MNC for short).

The MDT function can be divided into two working modes according to its operation in the idle state RRC_IDLE and in the connected state RRC_CONNECTED, specifically "Logged MDT" and "immediate MDT". Recording minimized drive test means that the UE collects and stores relevant measurement information when the configured condition is satisfied in the RRC_IDLE state, and is used for reporting when the eNBs receive the data in the future. Forward to TCE. Immediately minimizing the drive test means that when the UE is in the RRC_CONNECTED state, it collects relevant measurement information and actively uploads it to the eNB when the report meets the reporting condition, and then aggregates the report to the TCE.

The purpose of the terminal UE to perform various types of MDT measurement and reporting is to provide sufficient measurement sampling data for OAM/TCE to analyze the performance of various aspects of the network, such as wireless coverage and capacity requirements, so the accuracy of the terminal MDT measurement result is very The key, because if the measurement results are not accurate, it will bring different degrees of judgment interference to OAM/TCE, and even the decision made can not optimize the performance of the network, or waste the extra network resources. According to the different attributes of the MDT measurement object, the measurement content of the current LTE MDT can be classified into three types or three layers: L1: for example, the LTE downlink pilot signal (CRS; Channel State Information-Reference Signal, referred to as CRS) CSI-RS) statistical measurement of the strength RSRP and quality RSRQ quantity, L2: for example, statistical measurement of protocol layer delay/loss rate/loss amount of packet layer such as LTE MAC/RLC/PDCP, L3: for example, LTE specific data Statistical measurement of Data Radio Bearer (DRB) data throughput/throughput and other mobility related performance (handover, dropped calls, etc.) indicators. The accuracy of the above 3-layer/3 type MDT measurement object results may be affected by local interference from the terminal within a certain period of time. Here, terminal local interference refers to the following two categories:

Case 1: In the place close to the local location of the UE, there are other wireless base technology (Radio Access Technology, RAT) micro base stations or wireless signal transmission points, typically low-power nodes such as WLAN AP, Bluetooth device or wireless remote controller. The transmission frequency of the UE is adjacent to the current LTE working reception frequency of the UE. Therefore, the sideband leakage of the inter-frequency signal power may cause certain interference to the normal reception of the LTE signal of the UE. Usually the interference from these external RAT nodes is relatively random and may vary greatly with the change of the UE location. For example, when the UE is slightly away from these nodes, their interference is almost negligible, and when the UE is further close to these nodes, their The interference will be larger. FIG. 3(a) is an example of local interference case 1. The proxy node AP in the figure refers to a neighboring local interference source AP, UE1 is a UE that is doing MDT measurement, and UE2 is a neighboring local interference source UE. The AP, UE1, and UE2 are all located in the coverage of the operator network cell (that is, the circle in which the LTE base station eNB is located); both the AP and the UE2 generate local interference to the UE1.

Case 2: Other RAT modules have been embedded in the UE's internal hardware in close proximity, and the working frequencies of LTE and other RAT modules are adjacent. When other RAT modules randomly transmit wireless signals At the time, the LTE receiving module may be directly interfered by signals sent by those RAT transmitting modules. The interference of Case 2 and the interference of Case 1 are essentially the same, but since the other RAT modules in Case 2 are always integrated in the UE, the degree of interference is basically not affected by the change of the specific location of the UE. Figure 3 (b) is an example of local interference situation 2, LTE baseband chip is connected to antenna interface 1 through LTE radio frequency chip, GPS baseband chip is connected to antenna interface 2 through GPS radio frequency chip, BT (Bluetooth)/Wifi baseband chip passes BT/Wifi radio frequency The chip is connected to the antenna interface 3; wherein the LTE radio chip causes LTE interference to the GPS radio chip and the BT/Wifi radio chip, as indicated by the dotted arrow in the figure; the BT/Wifi radio chip will cause BT/Wifi interference to the LTE radio chip, As indicated by the solid arrows in the figure.

The above cases 1 and 2 belong to the terminal local interference, which is different from the wireless interference from the external network environment of the terminal external operator, because the terminal local interference and the deployment configuration of the external LTE network have nothing to do with the specific wireless parameter settings. It is completely unmanaged and controlled by carrier network elements such as eNB/MME/OAM. Therefore, it has the characteristics of latent, uncontrolled and random. These local interference information cannot directly provide valuable reference for network optimization decision. Under the local interference of the terminal, the UE will make different degrees of deviation when the measurement results of various MDTs are relatively free of local interference. These deviations may bring different degrees of judgment to OAM/TCE.

Summary of the invention

The technical problem to be solved by the present invention is to provide a method and device for minimizing road test, and to reduce the influence of local interference of the terminal on the accuracy of the MDT measurement result.

In order to solve the above problems, the following technical solutions are adopted:

A method of minimizing drive test MDT, including:

The UE receives a start or reconfiguration command to remove or mitigate MDT measurement local interference;

During the MDT measurement by the UE, when the UE prepares to record any MDT sample value, the UE detects that the local interference signal meets a predetermined condition, and performs predetermined processing on the MDT sample value to be recorded.

Optionally, before the step that the UE detects that the local interference signal meets a predetermined condition, the method further includes:

Receiving, by the UE, a configuration parameter, where the configuration parameter includes a length of an observation time window and an interference threshold threshold;

The predetermined condition is that the strength or energy of the local interference signal exceeds the interference threshold threshold for the observation time window.

Optionally, the step of performing predetermined processing on the MDT sample value to be recorded includes:

The MDT sample value to be recorded is added to a predetermined label and saved as an MDT record value.

The MDT sample value to be recorded is deleted, not saved as an MDT record value, or the MDT sample value to be recorded is recorded as a null value.

The MDT sample value to be recorded is subjected to interference filtering processing to obtain an MDT record value.

Optionally, the step of performing the interference filtering process on the MDT sample value to be recorded to obtain the MDT record value includes:

The MDT record value is obtained according to the following formula:

MDT record value (N) = MDT sample value (N) * a + MDT record value (N-1) * (1-a), where a is a fixed filter coefficient and N is a time serial number.

Optionally, before the step of receiving, by the UE, the startup or reconfiguration command to remove or mitigate the local interference of the MDT measurement, the method further includes:

The operation and maintenance system OAM/trace collection entity TCE generates the start or reconfiguration command to remove or mitigate the local interference of the MDT measurement when the UE finds that there is an abnormal value in the MDT measurement result obtained in the past one MDT session, and passes the The eNB where the UE is located is sent to the UE.

Optionally, the method further includes:

Stopping, by the UE, the predetermined processing after receiving a stop command for removing or mitigating local interference of the MDT measurement;

Before the step of the UE stopping the predetermined process, the method further includes: the OAM/TCE generating the removing or mitigating when the UE finds that there is no abnormal value in the MDT measurement result obtained in the past one MDT session. The MDT measures a stop command of local interference and sends it to the UE through the eNB where the UE is located.

Optionally, the method further includes:

When the locally preset condition is met, the UE sets the MDT configuration to be invalid;

When the MDT related configuration is failed, the UE stops operations related to the MDT configuration.

A minimization drive test MDT device is disposed in the terminal UE, and includes a data transceiver module and a recording module, wherein:

The data transceiver module is configured to: receive a start or reconfiguration command to remove or mitigate MDT measurement local interference;

The recording module is configured to: when the UE performs MDT measurement, when preparing to record any MDT sample value, if it is detected that the local interference signal meets a predetermined condition, the MDT sample value to be recorded is scheduled to be processed. .

Optionally, the data transceiver module is further configured to: receive a configuration parameter, where the configuration parameter includes a length of an observation time window and an interference threshold threshold;

Optionally, the recording module is configured to perform predetermined processing on the MDT sample value to be recorded as follows:

The recording module saves the MDT sample value to be recorded by adding a predetermined label and saves it as an MDT record value.

The recording module deletes the MDT sample value to be recorded, does not save as an MDT record value, or records the MDT sample value to be recorded as a null value.

The recording module performs interference filtering processing on the MDT sample value to be recorded to obtain an MDT record value.

Optionally, the recording module is configured to perform the interference filtering process on the MDT sample value to be recorded in the following manner to obtain the MDT record value:

The MDT record value is obtained according to the following formula:

Optionally, the starting or reconfiguring command for removing or mitigating MDT measurement local interference is performed by the operation and maintenance system OAM/tracking collection entity TCE when it is found that the UE has an abnormal value in the MDT measurement result obtained in a past MDT session. Generated and sent to the UE by the eNB where the UE is located.

Optionally, the recording module is further configured to: stop the predetermined processing after the data transceiver module receives a stop command to remove or mitigate the local interference of the MDT measurement;

The stop command for removing or mitigating the MDT measurement local interference is generated by the OAM/TCE when it is found that the UE no longer has an abnormal value in the MDT measurement result obtained in the past one MDT session, and is located by the UE. The eNB sends to the UE.

Optionally, the apparatus further includes a setting module, wherein:

The setting module is configured to: set the MDT configuration to be invalid when the local preset condition is met;

The recording module is further configured to: stop the MDT when the MDT is configured to be invalid Configure related MDT operations.

A computer program comprising program instructions that, when executed by a terminal, cause the terminal to perform any of the above-described minimized drive test MDT methods.

A carrier carrying the computer program as described.

The technical solution of the present invention can reduce the influence of local interference of the terminal on the accuracy of the MDT measurement result by processing the local interference signal according to the configuration of the terminal.

BRIEF abstract

1 is a schematic diagram of an LTE system architecture;

2(a) is a schematic diagram of a protocol stack architecture of a Uu/S1 interface control plane in LTE;

2(b) is a schematic diagram of a protocol stack architecture of a Uu/S1 interface user plane in LTE;

2(c) is a schematic diagram of a protocol stack architecture of an X2 interface control plane in LTE;

2(d) is a schematic diagram of a protocol stack architecture of an X2 interface user plane in LTE;

Figure 3 (a) is a schematic diagram of an example of local interference situation 1;

Figure 3 (b) is a schematic diagram of an example of local interference situation 2;

Figure 4 is a flow chart of an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a device according to an embodiment of the present invention.

Preferred embodiment of the invention

The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.

The technical solution of the present invention will be described in more detail below with reference to the accompanying drawings and embodiments.

Embodiment 1 is a method for minimizing drive test, comprising:

During the MDT measurement by the UE, when the UE prepares to record any MDT sample value and detects that the local interference signal meets a predetermined condition, then an MDT sample to be recorded is prepared. The value is processed as scheduled. Optionally, the UE receiving the start or reconfiguration command to remove or mitigate the MDT measurement local interference further includes:

Optionally, the predetermined condition is that the strength or energy of the local interference signal exceeds the interference threshold threshold for the observation time window.

Optionally, performing predetermined processing on an MDT sample value to be recorded includes:

The MDT sample value of the preparation record is added to a predetermined label and saved as an MDT record value.

The local interference signal includes a local interference signal from outside the UE and a local interference signal from inside the UE; the label added when the external local interference signal satisfies the predetermined condition may be different from the internal local interference signal. The label added when the condition is predetermined; if the external and internal local interference signals satisfy the predetermined condition, two labels may be added.

The MDT sample value of the preparation record is deleted, not saved as an MDT record value, or an MDT sample value of the preparation record is recorded as a null value (such as NULL).

The MDT sample value is subjected to interference filtering processing of the MDT sample value to be recorded to obtain an MDT record value.

Optionally, performing an interference filtering process on the MDT sample value of the prepared record to obtain an MDT record value, including: an MDT record value (N)=MDT sample value (N)*a+MDT record value (N-1)* (1-a), where a is a fixed filter coefficient and N is a time serial number.

Optionally, the starting or reconfiguring command to remove or mitigate the MDT measurement local interference is generated by the OAM/TCE when it is found that the UE has an outlier in the MDT measurement result obtained in the past one MDT session, and The eNB where the UE is located is sent to the UE.

Here, the reason for the outliers in the MDT measurement results may be that the UE is subject to local interference, and may or may not be completely.

Optionally, the method further includes:

The UE stops the predetermined processing after receiving a stop command to remove or mitigate the MDT measurement local interference; the stop command for removing or mitigating the MDT measurement local interference is determined by the OAM/TCE when the UE is in a past MDT session When the abnormal value is no longer present in the obtained MDT measurement result, it is generated and sent to the UE by the eNB where the UE is located.

The UE may, but is not limited to, determine by the configuration parameters in the command that the command is a start, reconfiguration, or stop command.

Optionally, the method further includes:

The UE sets the MDT related configuration to be invalid when the locally preset condition is met; when the MDT related configuration fails, the UE stops the related MDT operation.

The setting, by the UE, the MDT-related configuration to fail may be, but is not limited to, adopting a control manner without a display command.

The implementation condition of the foregoing embodiment is that the LTE network and the terminal UE both have normal capabilities (including communication capability, MDT measurement capability, data processing capability, etc.) and the ability to perform the steps mentioned in this embodiment, and the UE is in the normal wireless network of the LTE network. One or more types (L1/L2/L3) of MDT measurements are prepared and are being performed, among the local interference environments described in the background and in the background.

A specific implementation process of the foregoing embodiment in the LTE system is shown in FIG. 4, and includes:

S1: Optionally, the OAM/TCE obtains a series of MDT measurement results measured by a UE in a past MDT session Session(i) through an existing MDT measurement result collection process, and finds that the series of MDTs are found. In the measurement result, the MDT record value at some moments may be abnormal compared to the trend of the entire MDT data pattern curve (for example, the sample value suddenly becomes very high, very low, or the trend is very irregular, etc.), then the removal may be started. Or reduce the flow of MDT measurement local interference. The above i is a positive integer indicating the sequence number of the MDT Session.

S2: The OAM/MME/TCE sends a command (start) and related configuration parameters of “Remove or mitigate MDT measurement local interference” to the serving eNB where the UE is located through a control message on the terrestrial interface. The eNB further sends a command (start) and related configuration parameters of "removing or mitigating MDT measurement local interference" to the corresponding UE through a control message on the air interface.

S3: After receiving the command (start) and related configuration parameters of the “Remove or mitigate MDT measurement local interference” from the eNB, the UE internally performs one or more of the following schemes for removing or mitigating local interference of the MDT measurement:

Solution 1: In the local interference case 1, when the UE detects that other external RATs are transmitting interference signals (because the receiving module of the corresponding RATs is configured inside the UE, such interference signals can be detected), and when the UE is preparing When recording an MDT sample value, when the measured interference signal strength or energy exceeds a predetermined interference threshold threshold within a predetermined observation time window, the UE attaches the IDC-EX label to the MDT sample value to be recorded. Then save it as the MDT record value.

In local interference case 2, when the UE detects that other internal RATs are transmitting interference signals, and when the UE is preparing to record a certain MDT sample value, the measured interference signal strength or energy always exceeds within a predetermined observation time window. When the predetermined interference threshold is set, the UE adds the IDC-IN label to the MDT sample value to be recorded and then saves it as the MDT record value.

Solution 2: In local interference case 1, when the UE detects that other external RATs are transmitting interference signals, and when the UE is preparing to record a certain MDT sample value, the measured interference signal strength or energy is in a predetermined observation time window. When the predetermined interference threshold threshold is exceeded, the UE does not record the MDT sample value to be recorded (this can reduce the storage of useless information and the amount of MDT report information), that is, the MDT sample value is not saved as the MDT record value. Or record as a null value.

In local interference case 2, when the UE detects that other internal RATs are transmitting interference signals, and when the UE is preparing to record a certain MDT sample value, the measured interference signal strength or energy always exceeds within a predetermined observation time window. When the predetermined interference threshold is reached, the UE does not record the MDT sample value to be recorded, that is, does not save the MDT sample value as an MDT record value or record as a null value.

Solution 3: In local interference case 1, when the UE detects that other external RATs are transmitting interference signals, and when the UE is preparing to record a certain MDT sample value, the measured interference signal strength or energy is in a predetermined observation time window. When the predetermined interference threshold threshold is exceeded, the UE performs a specific interference filtering process on the MDT sample value to be recorded to obtain an MDT record value.

In the local interference case 2, when the UE detects that other internal RATs are transmitting interference signals, And when the UE is preparing to record a certain MDT sample value, and the measured interference signal strength or energy exceeds a predetermined interference threshold threshold within a predetermined observation time window, the UE specifies the MDT sample value to be recorded. The interference filter processing is performed to obtain an MDT record value.

As a simple filtering scheme example, for example: MDT record value (N) = MDT sample value (N) * a + MDT record value (N-1) * (1-a), where a is a fixed filter coefficient, which can be The relevant configuration parameter is obtained or preset in the UE; N is a time serial number; when N is 1 (ie, when the session is recorded for the first time), the MDT record value (N-1) is 0.

The length of the observation time window and the interference threshold threshold may be obtained by the relevant configuration parameter, or preset in the UE; the UE may specifically select which processing scheme, or the UE may determine according to the relevant configuration parameter. , or perform a predetermined or default scenario.

S4: The UE performs the S3 removal or mitigation of the local interference of the MDT measurement, and then triggers and reports according to the existing MDT result of the LTE system (may but not limited to the existing MDT measurement data reporting module of the LTE system), and reports The eNB has further recorded a series of MDT measurement results (ie, a series of MDT record values) after the local interference is removed (ie, after step S3), and the eNB further reports the MDT series of measurement results to the TCE for summary analysis.

S5: Optionally, the OAM/TCE obtains a series of MDT measurement results measured by the UE in a new MDT Session(j) through the existing MDT measurement result collection process, and after reanalysis, it is found that: In the measurement results, the MDT pattern curve trend is normal (such as the MDT entry record without IDC-EX/IN label (when using scheme 1), there is no missing MDT entry record at some time (when using scheme 2), the MDT pattern curve trend The overall comparison is smooth (when using scenario 3)).

The OAM/TCE selects to stop/re-disable the process of removing or mitigating the local interference of the MDT measurement, and performs S6; or selects the UE to continue to execute the previously configured scheme for removing or mitigating local interference of the MDT measurement and related parameters, and returns to S3. The above j is a positive integer, indicating the sequence number of the MDT Session, which is greater than i.

Of course, in other cases, the OAM/TCE may also decide to stop the process of removing or mitigating local interference of the MDT measurement, such as when it is determined that the abnormal measurement result is caused by local interference.

S6: Similar to the foregoing step S2, the OAM/MME/TCE sends a new command to “remove or mitigate the local interference of the MDT measurement” (stop or re-distribute) and related configuration parameters to the service of the UE through the control message on the ground interface. eNB. The eNB further passes control over the air interface The message sends a command (stop or reconfigure) and related configuration parameters to the UE to remove or mitigate MDT measurement local interference. If it is a reconfiguration command, the UE then proceeds to step S3 again to perform a new round of removal or mitigation of the flow of MDT measurement local interference; if it is a stop command, the UE returns to S1 and waits for the next round of determination.

The content of the above embodiment provides a method for mitigating the influence of local interference of the terminal on the accuracy of the measurement result. This embodiment is applicable to the case of a problem with MDT or similar technology and facing local interference, and may be, but is not limited to, MDT for use in an LTE system.

The present embodiment will be further specifically described below by way of several embodiments.

Implementation example 1:

S100: The carrier A configures the Logged MDT related parameters for the UE 3 served by the eNB under the jurisdiction, and learns through the existing LTE wireless capability interaction process that the UE3 has the corresponding capability. The UE 3 in the RRC_IDLE state is free to move within the eNB cell, and performs related measurement of the MDT L1.

S101: The OAM/TCE obtains a series of MDT measurements measured by the UE 3 in the past MDT Session(i) through the existing MDT measurement result collection process. After analysis, it is found that, in some time periods, The RSR measured RSRQ (LTE Reference Signal Receive Quality) recorded value irregularly periodically appears to have some low valleys, and thus determines the process of starting to remove or mitigate the local interference of the MDT measurement.

S102: The OAM/MME sends a start command and related configuration parameters, such as an evaluation time window length T1 and an interference threshold threshold TL1, to the “removing or mitigating MDT measurement local interference” by using a control message “minimize the drive test configuration message” on the ground interface. It is sent to the serving eNB where the UE 3 is located. The eNB further transmits the above information to the UE 3 via a control message "Minimize Drive Test Configuration Message" on the air interface.

S103: After the UE 3 receives and configures the foregoing “Remove or Reduce MDT Measurement Local Interference” command and related configuration parameters from the eNB, the internal solution of removing or mitigating local interference of the MDT measurement is performed while continuing to perform the Logged MDT. to evaluate. Then, in the case where the evaluation condition is satisfied, the UE 3 obtains a series of MDT record values containing the IDC-EX and IDC-IN tags.

S104: The UE 3 performs the S1 removal or mitigation of the local interference of the MDT to measure the local interference, and the reporting is performed according to the existing MDT result triggering and reporting method (Logged MDT Results Available indication, UE Information Request/UE Information Response process) of the LTE system. The MN records a series of measurements of the new MDT, and the eNB further reports the MDT series of measurements to the TCE for analysis.

S105: The OAM/TCE obtains a series of MDT data reported by the UE 3 at S104, and after re-analysis, it is found that the low-altitude RSRQ sample record values of most irregular periods in the MDT pattern curve are accompanied by IDC-EX and IDC-IN. The tag, therefore, determines that these "outliers" are caused by UE 3 local interference. The OAM/TCE further decides to stop the UE 3 from removing or mitigating the process of MDT measuring local interference.

S106: The OAM/MME/eNB stops the process of removing or mitigating the local interference of the MDT by using the control message “Minimize the drive test configuration message” on the ground/air interface in S102. Then if the MDT measurement of UE 3 is still going on, no processing scheme to remove or mitigate the local interference of the MDT measurement is performed.

Implementation example 2:

S200: The operator B configures the relevant MDT related parameters for the UE 4 served by the eNB under the jurisdiction of the eNB, and learns through the LTE existing wireless capability interaction process that the UE 4 has the corresponding capability. The UE 4 in the RRC_CONNECTED state is free to move within the eNB cell, and performs related measurement of the MDT L2.

S201: The OAM/TCE has obtained a series of MDT measurement results measured by the UE 4 in the past MDT Session(i) through the existing MDT measurement result collection process. After analysis, it is found that, in some time periods, The DTIP packet loss rate sampling record value of a user's VOIP service measured by the MDT periodically appears to have some glitch peaks, so it is decided to start the process of removing or mitigating the local interference of the MDT measurement.

S202: The OAM/MME uses the control message “Minimize the drive test configuration message” on the ground interface to set a start command and related configuration parameters, such as an evaluation time window length T2 and an interference threshold threshold TL2, to “remove or mitigate MDT measurement local interference”. It is sent to the serving eNB where the UE 4 is located. eNB The above information is sent to the UE 4 in one step through the control message "Minimize the drive test configuration message" on the air interface.

S203: After receiving and configuring the start command and related configuration parameters of the foregoing “removing or mitigating MDT measurement local interference” from the eNB, the UE 4 performs the scheme of removing or mitigating local interference of the MDT measurement while continuing to perform the immediate MDT. to evaluate. Then, in the case that the evaluation condition is satisfied, the UE 4 deletes the MDT sample value and does not record at some MDT measurement sampling moments.

S204: After performing the S203 removal or mitigation of the MDT measurement local interference, the UE 4 reports the existing MDT result triggering and reporting method (immediate MDT Results Available indication, UE Information Request/UE Information Response process) in the LTE system. The MN records a series of measurements of the new MDT, and the eNB further reports the MDT series of measurements to the TCE for analysis.

S205: The OAM/TCE obtains a series of MDT data reported by the UE 4 in S204, and after re-analysis, it is found that the user VOIP service PDCP packet loss rate sampling glitch record value periodically appears in the MDT pattern curve, so the past abnormalities are determined. The value is caused by local interference of UE 4. The OAM/TCE further decides to maintain the UE 4 process of removing or mitigating local interference of the MDT measurement.

S206: The OAM/MME/eNB reconfigures the process of removing or mitigating local interference of the MDT measurement by using the control message “Minimize the drive test configuration message” on the ground/air interface in S202, and may modify some related parameters. For example, the time window length T2 and the interference threshold threshold TL2 are evaluated. Thereafter, if the MDT measurement of the UE 4 is still continuing, the processing scheme of removing or mitigating the local interference of the MDT measurement is continued.

Example 3:

S300: The carrier C configures the relevant MDT related parameters for the UE 5 served by the eNB under the jurisdiction of the eNB, and learns through the LTE existing wireless capability interaction process that the UE 5 has the corresponding capability. The UE 5 in the RRC_CONNECTED state is free to move within the eNB cell, performing related measurements of the MDT L3.

S301: OAM/TCE has obtained the existing MDT measurement result collection process. A series of MDT measurements measured by UE 5 in the past MDT Session(i). After analysis, it is found that during certain time periods, the MDT measures the PDCP packet throughput rate of a certain data download service of a certain user. Some low valleys appeared, so it was decided to initiate the process of removing or mitigating local interference of MDT measurements.

S302: The OAM/MME sends a start command and related configuration parameters, such as an evaluation time window length T3 and an interference threshold threshold TL3, to the “removing or mitigating local interference of the MDT measurement” through a control message “minimize the drive test configuration message” on the ground interface. The interference filter coefficient a is sent to the serving eNB where the UE 5 is located. The eNB further transmits the above information to the UE 5 via a control message "Minimize Drive Test Configuration Message" on the air interface.

S303: After receiving and configuring the start command and related configuration parameters of the foregoing “removing or mitigating MDT measurement local interference” from the eNB, the UE 5 performs the scheme of removing or mitigating local interference of the MDT measurement while continuing to perform the immediate MDT. to evaluate. Therefore, under the premise that the evaluation condition is satisfied, the UE 5 performs interference filtering processing on the MDT sample value, and adopts a filtering formula such as an MDT record value (N)=MDT sample value (N)*a+MDT record value (N-1)*( 1-a).

S304: After performing the S303 removal or mitigation of the MDT measurement local interference, the UE 5 performs the MDT result triggering and reporting mode (immediate MDT Results Available indication, UE Information Request/UE Information Response process), and the reporting has been recorded. The new MDT series of measurements, the eNB further reported the MDT series of measurements to the TCE summary analysis.

S305: The OAM/TCE obtains a series of MDT data reported by the UE 5 in S304, and after re-analysis, it is found that the PDCP packet throughput rate of the data download service of the user that appears periodically in the MDT pattern curve basically disappears, so the past is determined. Those "outliers" are caused by UE 5 local interference. The OAM/TCE further decides to maintain the UE 5 to remove or mitigate the process of MDT measurement local interference.

S306: The OAM/MME/eNB reconfigures the process of removing or mitigating local interference of the MDT measurement by using the control message “Minimize the drive test configuration message” on the ground/air interface in S302, and may modify some related parameters. For example, the time window length T3 and the interference threshold threshold TL3, and the interference filter coefficient a are evaluated. Then if the MDT measurement of UE 5 continues, continue to A treatment scheme that removes or mitigates local interference from MDT measurements.

The second embodiment, a minimization of the drive test MDT device, is disposed in the terminal, as shown in FIG. 5, and includes:

The data transceiver module 501 is configured to: receive a start or reconfiguration command to remove or mitigate the local interference of the MDT measurement;

The recording module 502 is configured to: in the process of performing the MDT measurement, if it is determined that the local interference signal meets the predetermined condition when preparing to record any one of the MDT sample values, perform predetermined processing on an MDT sample value to be recorded.

Optionally, the data transceiver module 501 is further configured to: receive a configuration parameter; the configuration parameter includes a length of an observation time window and an interference threshold threshold;

Optionally, the recording module 502 performs predetermined processing on an MDT sample value to be recorded, which means:

The recording module 502 adds an MDT sample value to be prepared for recording to a predetermined label and saves it as an MDT record value.

The recording module 502 deletes an MDT sample value to be recorded, does not save as an MDT record value, or records an MDT sample value of the preparation record as a null value.

The recording module 502 performs an interference filtering process on the MDT sample value to be recorded to obtain an MDT record value.

Optionally, the MDT record value obtained by the recording module 502 is:

Optionally, the recording module 502 is further configured to: stop the predetermined processing after the data transceiver module receives a stop command to remove or mitigate the local interference of the MDT measurement;

The stop command for removing or mitigating the MDT measurement local interference is generated by the OAM/TCE when it is found that the UE no longer has an abnormal value in the MDT measurement result obtained in the past one MDT session, and is sent by the eNB where the UE is located. To the UE.

Optionally, the device further includes:

The setting module 503 is configured to: set the MDT related configuration to be invalid when the local preset condition is met;

The recording module 502 stops the related MDT operation when the MDT related configuration fails.

Wherein, the setting module 503 sets the MDT related configuration to be invalid, but is not limited to the control mode using no display command.

The embodiment of the invention further discloses a computer program, comprising program instructions, when the program instruction is executed by the terminal, so that the terminal can perform any of the above-mentioned minimized drive test MDT methods.

The embodiment of the invention also discloses a carrier carrying the computer program.

Other aspects will be apparent upon reading and understanding the drawings and detailed description.

It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments in the present application may be arbitrarily combined with each other. The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the invention and the drawings are directly or indirectly applied to other related The technical field is equally included in the scope of patent protection of the present invention.

Of course, various other modifications and changes can be made in accordance with the present invention without departing from the spirit and scope of the invention. However, such corresponding changes and modifications are intended to be included within the scope of the appended claims.

One of ordinary skill in the art will appreciate that all or a portion of the steps described above can be accomplished by a program that instructs the associated hardware, such as a read-only memory, a magnetic or optical disk, and the like. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the foregoing embodiment may be implemented in the form of hardware or in the form of a software function module. The invention is not limited to any specific form of combination of hardware and software.

Industrial applicability

The technical solution of the present invention can reduce the influence of local interference of the terminal on the accuracy of the MDT measurement result by processing the local interference signal according to the configuration of the terminal. Therefore, the present invention has strong industrial applicability.

Claims

A method of minimizing drive test MDT, including:

The UE receives a start or reconfiguration command to remove or mitigate MDT measurement local interference;

During the MDT measurement by the UE, when the UE prepares to record any MDT sample value, the UE detects that the local interference signal meets a predetermined condition, and performs predetermined processing on the MDT sample value to be recorded.
The MDT method according to claim 1, wherein the method further comprises: before the step of the UE detecting that the local interference signal meets a predetermined condition, the method further comprises:

Receiving, by the UE, a configuration parameter, where the configuration parameter includes a length of an observation time window and an interference threshold threshold;

The predetermined condition is that the strength or energy of the local interference signal exceeds the interference threshold threshold for the observation time window.
The MDT method according to claim 1 or 2, wherein said step of performing predetermined processing on said MDT sample value to be recorded includes:

The MDT sample value to be recorded is added to a predetermined label and saved as an MDT record value.
The MDT method according to claim 1 or 2, wherein said step of performing predetermined processing on said MDT sample value to be recorded includes:

The MDT sample value to be recorded is deleted, not saved as an MDT record value, or the MDT sample value to be recorded is recorded as a null value.
The MDT method according to claim 1 or 2, wherein said step of performing predetermined processing on said MDT sample value to be recorded includes:

The MDT sample value to be recorded is subjected to interference filtering processing to obtain an MDT record value.
The MDT method according to claim 5, wherein said said preparation is to record The steps of obtaining the MDT record value after the MDT sample value is subjected to the interference filter process include:

The MDT record value is obtained according to the following formula:

MDT record value (N) = MDT sample value (N) * a + MDT record value (N-1) * (1-a), where a is a fixed filter coefficient and N is a time serial number.
The MDT method of claim 1, wherein the method further comprises: before the step of the UE receiving a start or reconfigure command to remove or mitigate MDT measurement local interference, the method further comprising:

The operation and maintenance system OAM/trace collection entity TCE generates the start or reconfiguration command to remove or mitigate the local interference of the MDT measurement when the UE finds that there is an abnormal value in the MDT measurement result obtained in the past one MDT session, and passes the The eNB where the UE is located is sent to the UE.
The MDT method of claim 1 further comprising:

Stopping, by the UE, the predetermined processing after receiving a stop command for removing or mitigating local interference of the MDT measurement;

Before the step of the UE stopping the predetermined process, the method further includes: the OAM/TCE generating the removing or mitigating when the UE finds that there is no abnormal value in the MDT measurement result obtained in the past one MDT session. The MDT measures a stop command of local interference and sends it to the UE through the eNB where the UE is located.
The MDT method of claim 1 further comprising:

When the locally preset condition is met, the UE sets the MDT configuration to be invalid;

When the MDT related configuration is failed, the UE stops operations related to the MDT configuration.
A minimization drive test MDT device is disposed in the terminal UE, and includes a data transceiver module and a recording module, wherein:

The data transceiver module is configured to: receive a start or reconfiguration command to remove or mitigate MDT measurement local interference;

The recording module is configured to: when the UE performs MDT measurement, when preparing for recording When any of the MDT sample values are detected, if the local interference signal is detected to meet the predetermined condition, the MDT sample value to be recorded is subjected to predetermined processing.
The MDT apparatus of claim 10 wherein:

The data transceiver module is further configured to: receive a configuration parameter, where the configuration parameter includes a length of an observation time window and an interference threshold threshold;

The predetermined condition is that the strength or energy of the local interference signal exceeds the interference threshold threshold for the observation time window.
The MDT apparatus according to claim 10 or 11, wherein said recording module is arranged to perform predetermined processing on said MDT sample value to be recorded as follows:

The recording module saves the MDT sample value to be recorded by adding a predetermined label and saves it as an MDT record value.
The MDT apparatus according to claim 10 or 11, wherein said recording module is arranged to perform predetermined processing on said MDT sample value to be recorded as follows:

The recording module deletes the MDT sample value to be recorded, does not save as an MDT record value, or records the MDT sample value to be recorded as a null value.
The MDT apparatus according to claim 10 or 11, wherein said recording module is arranged to perform predetermined processing on said MDT sample value to be recorded as follows:

The recording module performs interference filtering processing on the MDT sample value to be recorded to obtain an MDT record value.
The MDT apparatus according to claim 14, wherein the recording module is configured to perform the interference filtering process on the MDT sample value to be recorded in the following manner to obtain the MDT record value:

The MDT record value is obtained according to the following formula:

MDT record value (N) = MDT sample value (N) * a + MDT record value (N-1) * (1-a), where a is a fixed filter coefficient and N is a time serial number.
The MDT apparatus of claim 10 wherein:

The startup or reconfiguration command for removing or mitigating MDT measurement local interference is generated by the operation and maintenance system OAM/tracking collection entity TCE when it is found that the UE has an abnormal value in the MDT measurement result obtained in the past one MDT session, and passes The eNB where the UE is located is sent to the UE.
The MDT apparatus of claim 10 wherein:

The recording module is further configured to: stop the predetermined processing after the data transceiver module receives a stop command to remove or mitigate the local interference of the MDT measurement;

The stop command for removing or mitigating the MDT measurement local interference is generated by the OAM/TCE when it is found that the UE no longer has an abnormal value in the MDT measurement result obtained in the past one MDT session, and is located by the UE. The eNB sends to the UE.
The MDT apparatus of claim 10, further comprising a setting module, wherein:

The setting module is configured to: set the MDT configuration to be invalid when the local preset condition is met;

The recording module is further configured to: stop the MDT operation associated with the MDT configuration when the MDT is configured to fail.