KR20210029296A - Method for implementing mdt continuity - Google Patents

Abstract

The present invention provides a method for implementing the continuity of MDT. In the case of management-based MDT, if the selected PLMN of the UE is the HPLMN of the UE, the EHPLMN of the UE, or the equivalent PLMN of the HPLMN or EHPLMN, the base station acquires the user authorization information of the UE and measures the MDT according to the acquired user authorization information. Select a UE to perform; In the case of the signaling-based MDT, if the selected PLMN of the UE is the HPLMN of the UE, the EHPLMN of the UE, or the equivalent PLMN of the HPLMN or EHPLMN, the base station acquires the MDT configuration information of the MDT and performs MDT measurement according to the MDT configuration information. do. Using these methods of the present invention, the eNB can perform MDT measurements in the range of the HPLMN of the UE, the EHPLMN of the UE, or the equivalent PLMN of the HPLMN or EHPLMN and select the UE for receiving the MDT report of the UE, so that HPLMN, EHPLMN Alternatively, it supports MDT measurement in the equivalent PLMN of HPLMN or EHPLMN, and implements MDT continuity.

Description

Method for implementing MDT continuity{METHOD FOR IMPLEMENTING MDT CONTINUITY}

The present invention relates to wireless communication technology, and more particularly, to a method for implementing continuity of MDT (Minimization of drive tests).

1 is a schematic diagram showing the structure of a conventional system architecture evolution (SAE).

In FIG. 1, a user equipment (UE) 101 is a terminal device that receives data. The evolved universal terrestrial radio access network (E-UTRAN) 102 is a radio access network that includes an eNodeB/NodeB that provides a radio network interface to a UE. The mobility management entity (MME) 103 is adapted to manage mobility contexts, session contexts, and security information of the UE. The serving gateway (SGW) 104 is adapted to provide the functions of the subscriber plane. MME 103 and SGW 104 may be in the same geography entity. The packet gateway (PGW) 105 is adapted to implement billing and legal monitoring functions. PGW 105 and SGW 104 may be in the same geographic entity. The Policy and Charging Rules Function (PCRF) 106 is coordinated to provide QoS policies and charging rules. The service GPRS support node (SGSN) 108 is a network node device for providing routing for data transmission in a universal mobile communication system (UMTS). The home subscriber server (HSS) 109 is the home sub-system of the UE and user information including the current location of the UE, the address of the serving node, user security information, and the packet data context of the UE. Is adjusted to protect.

MDT (Minimization of drive tests) is the transmission of some measurement information in the control plane to reduce the burden of manual tests. MDT measurement needs to support real-time measurement and non-real-time measurement. The configuration information of the measurement is configured by the network management system in the access network control system (E-UTRAN or UTRAN). Next, it is transmitted to the UE through a radio resource control (RRC) message by the access network control system. Then, the MDT measurement results of the UE are transmitted to the E-UTRAN/UTRAN, and the measurement report may include location information and time information. The E-UTRAN/UTRAN transmits the measurement result to the MDT entity of the core network.

Based on the modes of running the MDT, the MDT can be divided into a management based MDT and a signaling based MDT. Management-based MDT means that E-UTRAN/UTRAN receives MDT activation information from a management entity, and signaling-based MDT means that E-UTRAN/UTRAN receives MDT activation information from the MME.

2 is a schematic diagram showing the structure of a conventional management-based MDT measurement. In FIG. 2, reference numeral 201 denotes element management (EM), EM 201 transmits a trace activation request to a network element (NE) 202, and NE 202 denotes an LTE system. In may be an eNB, the tracking activation request includes configuration information of the MDT. The configuration information of MDT includes MDT location selection conditions, reporting mechanism configuration, Trace Reference (TR), IP address of a trace collection entity (TCE), work type, MDT data anonymity, and the like.

The task type can consist of one of four types: Immediate MDT only, Logged MDT only, Trace only and Immediate MDT and Trace.

The immediate MDT-only type is an instant MDT type and means a type required for the UE to perform MDT measurement in a connection mode. The logged MDT-only type is a blog type MDT, which means that the UE acquires the MDT configuration in connected mode, MDT measurement is performed when the UE is in idle mode, and when the UE returns to the connected mode, MDT This means that the measurement results are reported. In the case of the tracking-only type, only tracking is performed and the tracking-only type is a type that does not belong to MDT. Immediate MDT and tracking type means that you will perform both immediate MDT measurements and tracking measurements.

In the MDT location selection condition, the locations of the UE that can be selected as the user of MDT measurement are configured. The location selection condition may be configured as a range of cells, or a range of a tracking area code (TAC), or an entire PLMN. In this range, the UE can be selected as the UE of the MDT. The TR uniquely identifies the MDT procedure. In the MDT procedure, the eNB may select multiple users to perform MDT measurement.

NE 202 selects a UE for performing MDT measurement. When selecting a UE, the eNB needs to consider a location selection condition in user consent information and MDT configuration information transmitted by the MME. If the UE does not agree to perform MDT or the UE does not meet the location selection condition, the UE cannot be selected as the UE of MDT. When the UE is selected, the eNB allocates a Trace Recording Session Reference (TRSR) to the UE and transmits MDT configuration information to the UE. The configuration information includes the location selection condition, the reporting mechanism configuration, and the ID (identity) of the IP address of the TR, TRSR, and TCE.

The UE 203 performs MDT measurement according to the configuration, and reports the measurement result to the eNB through the MDT report when the reporting condition is satisfied; The eNB needs to send a Cell Traffic Trace Message to the MME after receiving the MDT report from the UE.

*eNB acquires the identity (ID) of the IP address of the TR, TRSR, and TCE, the measurement result from the MDT report sent by the UE, finds the IP address of the TCE according to the ID of the IP address of the TCE, and After the relationship between the IP addresses is previously stored in the eNB, the eNB transmits a cell traffic tracking message to the MME. The message includes the TR, TRSR, cell ID, S1 AP ID assigned to the UE by the eNB and MME, and the IP address of the TCE.

After receiving the cell traffic tracking message, the MME finds the IMSI or IMEISV of the UE and sends the IMSI/IMEISV to the TCE.

The NE 202 stores the MDT record and finds the IP address of the TCE according to the ID of the TCE's IP address transmitted by the UE and a preset strategy. The relationship between the IP address ID of the TCE and the IP address of the TCE is stored in advance in the eNB. The eNB transmits the MDT record to the TCE, and the TCE realizes the UE corresponding to the MDT record according to the information transmitted by the MME and the eNB.

The business type supported by the signaling-based MDT also includes the above four types.In the signaling-based MDT, an MDT initiation message is transmitted to the eNB by the MME, and the configuration information is transmitted to the eNB by the MME, and the TR and The TRSR is allocated by the MME. When the UE moves between different eNBs, MDT configuration information needs to be transmitted to the target eNB. The MDT configuration information of the management-based MDT need not be transmitted to the target eNB.

Currently, only MDT measurements and reports performed on the same public land mobile network (PLMN) are supported.

When the UE is located in the cell of the PLMN, it supports the UE to receive the configuration information of the MDT measurement from the network side, and when the UE moves to a cell of a different PLMN, the UE is a cell configured by the PLMN ID and MDT measurement of the selected cell. You will notice that the PLMN ID is different. Thus, the UE does not perform MDT measurement and will not report the measurement result to the network side. As can be seen, the UE only supports MDT measurement in one PLMN.

Similarly, only the network side supports MDT measurement in one PLMN. In the case of signaling-based MDT, the source eNB transmits MDT configuration information to the target eNB only when the source PLMN and the target PLMN have the same ID. When the UE performs X2 handover in the management-based MDT, the source eNB transmits user authorization information to the target eNB only when the IDs of the source PLMN and the target PLMN are the same. When the target eNB belongs to another PLMN, the target eNB cannot perform MDT measurement without user authorization information or configuration information of the MDT or select a UE for continuously performing MDT measurement.

One operator can have multiple PLMN IDs, and the requirements of the application are: The MDT measurement of the UE needs to be continuous in the range of one operator, that is, when the UE moves to another PLMN, that PLMN and If the original PLMN belongs to the same operator, the MDT measurement can be performed continuously, and can be continuously reported to the network. However, current mechanisms cannot meet these requirements.

Embodiments of the present invention provide a method for implementing MDT continuity, so as to implement MDT continuity in different PLMNs.

Embodiments of the present invention provide a method for implementing the continuity of MDT, the method,

A.The selected public land mobile network (PLMN) of the UE is the home PLMN (HPLMN) of the UE, or the equivalent home PLMN (EHPLMN) of the UE, or the HPLMN of the UE or the equivalent PLMN of EHPLMN, or the range of PLMNs that support continuity of MDT measurement When belonging to the MDT PLMN list indicating (scope), the base station obtaining user authorization information of the UE; And

B. The base station includes the step of selecting a UE for performing MDT measurement according to the user authorization information of the UE.

Preferably, the base station of step A is a target base station;

Step A is

In an S1 handover procedure, obtaining, by a target base station, user authorization information of the UE from a handover request message transmitted by a mobility management entity (MME);

Or in the X2 handover procedure, the target base station transmits a path handover request message including the ID of the selected PLMN of the UE to the MME, and from the path handover request response message transmitted by the MME Obtaining user authorization information;

Or in the X2 handover procedure, the target base station obtaining user authorization information of the UE from the handover request message transmitted by the source base station.

Preferably, the base station of step A is a base station in a radio resource control (RRC) setup procedure;

Step A, in the RRC setup procedure, includes the step of obtaining, by the base station, user information of the UE from an initial context setup message transmitted by the MME.

Preferably, the base station of step A is the target base station after the handover procedure is finished;

Step A includes the step of obtaining, by the target base station, user authorization information of the UE from a downlink non-access layer transmission message or an initial context modification request message transmitted by the MME.

Preferably, step A further comprises the step of obtaining, by the base station, MDT configuration information of the MDT and/or the HPLMN ID and/or the EHPLMN ID of the UE.

Preferably, the EHPLMN ID of the UE is transmitted to the MME through a location update acknowledgment message by the home subscriber server (HSS) of the UE when the UE initiates a registration procedure.

Preferably, the path handover request message sent by the target base station to the MME includes an indication indicating that the target base station needs to obtain a PLMN list of the MDT;

The path handover request response message transmitted by the MME includes an MDT PLMN list.

Embodiments of the present invention are a method for implementing MDT continuity applying a signaling based MDT,

A. The selected public land mobile network (PLMN) of the UE is the home PLMN (HPLMN) of the UE, or the equivalent home PLMN (EHPLMN) of the UE, or the HPLMN of the UE or the equivalent PLMN of EHPLMN, or the range of PLMN that supports continuity of MDT measurement If belonging to the MDT PLMN list indicating, the base station obtaining the MDT configuration of the MDT; And

B. The base station includes the step of performing MDT measurement according to the MDT configuration information.

Preferably, the base station of step A is the target base station in the handover procedure;

Step A is

In the S1 handover procedure, the target base station obtaining MDT configuration information from a handover request message transmitted by a mobility management entity (MME);

Or in the X2 handover procedure, the target base station transmitting a path handover request message including the ID of the selected PLMN of the UE to the MME, and obtaining MDT configuration information from the path handover request response message transmitted by the MME. ; And

Or in the X2 handover procedure, the target base station obtaining MDT configuration information from the handover request message transmitted by the source base station.

Preferably, the base station of step A is the target base station after the handover procedure is finished;

Step A includes, by the target base station, obtaining MDT configuration information from a downlink non-access layer transmission message or an initial context modification request message transmitted by the MME.

Preferably, in step A, the base station further includes the user authorization information of the UE and/or the HPLMN ID of the UE and/or the EHPLMN ID of the UE.

Preferably, the EHPLMN ID of the UE is transmitted to the MME through a location update confirmation message by the home subscriber server (HSS) of the UE when the UE initiates the registration procedure.

Preferably, the path handover request message sent by the target base station to the MME includes an indication indicating that the target base station needs to obtain the MDT PLMN list;

The path handover request response message transmitted by the MME includes a PLMN list of the MDT.

As can be seen from the method for implementing the continuity of MDT provided by the embodiments of the present invention, in the case of the management-based MDT, the selected PLMN of the UE is the HPLMN of the UE, the EHPLMN of the UE, or the equivalent of the HPLMN or EHPLMN If it is a PLMN, the base station obtains user authorization information of the UE, and selects a UE for performing MDT measurement according to the obtained user authorization information; In the case of the signaling-based MDT, if the selected PLMN of the UE is the HPLMN of the UE, the EHPLMN of the UE, or the equivalent PLMN of the HPLMN or EHPLMN, the base station acquires MDT configuration MDT information of the MDT, and performs MDT measurement according to the MDT configuration information. . Using these methods of the present invention, the eNB can select the UE for performing MDT measurement and receiving the MDT report of the UE in the range of the HPLMN of the UE, the EHPLMN of the UE, or the equivalent PLMN of the HPLMN or EHPLMN, so that HPLMN, EHPLMN Alternatively, it supports MDT measurement in the equivalent PLMN of HPLMN or EHPLMN, and implements MDT continuity.

1 is a schematic diagram showing the structure of a conventional SAE system.
2 is a schematic diagram showing the structure of a conventional management-based MDT measurement.
3 is a flowchart showing a method for implementing continuity of MDT according to the first embodiment of the present invention.
4 is a flowchart illustrating a method for implementing continuity of MDT according to a second embodiment of the present invention.
5 is a flowchart showing a method for implementing continuity of MDT according to a third embodiment of the present invention.
6 is a flowchart illustrating a method for implementing continuity of MDT according to a fourth embodiment of the present invention.
7 is a flowchart illustrating a method for implementing continuity of MDT according to a fifth embodiment of the present invention.
8 is a flowchart showing a method for implementing continuity of MDT according to the sixth embodiment of the present invention.

The present invention will be described in more detail below with reference to the accompanying drawings as well as embodiments in order to clarify the object, technical solution, and advantages of the invention.

Each PLMN has a PLMN ID, and the PLMN ID includes a mobile country code (MCC) and a mobile network code (MNC).

The home PLMN (HPLMN) refers to a PLMN having an MCC and MNC having the same ID as the MCC and MNC of the user's IMSI, respectively. The equivalent home PLMN (EHPLMN) is a group of PLMNs, the PLMN group is equivalent to the HPLMN of the UE, and the IDs of this PLMN group constitute the EHPLMN list. The UE's EHPLMN list is the UE's contract information, stored by the HSS and transmitted to the MME by the HSS. When the UE initiates the registration procedure, the MME sends a location update request to the HSS to request the acquisition of the UE's contract information, and the HSS sends the EHPLMN to the MME through a location update acknowledgment.

In the handover procedure or the RRC connection establishment procedure, the target PLMN selected for the UE is also referred to as a registered PLMN (rPLMN) or a selected PLMN in the current protocol.

The network constructs a list of equivalent PLMNs for the selected PLMN. The equivalent PLMN list is abbreviated as an ePLMN list, and is a feature supported by the current protocol and is configured by the MME that transmits the equivalent PLMN list to the eNB and the UE. HPLMN or EHPLMN equivalent PLMN: When HPLMN or EHPLMN is included in the ePLMN list of the selected PLMN, it means that all other PLMNs in the ePLMN list of the selected PLMN are HPLMN or EHPLMN equivalent PLMNs.

The basic idea of the present invention is to support MDT measurement continuity in the range of the HPLMN of the UE, the EHPLMN of the UE, and the equivalent PLMN of the HPLMN or EHPLMN.

In the case of management-based MDT, if the selected PLMN of the UE is the HPLMN of the UE, the EHPLMN of the UE, or the HPLMN of the HPLMN or the equivalent PLMN of the EHPLMN, the base station acquires the user authorization information of the UE and measures the MDT according to the acquired user information. Select the UE to perform. In the case of signaling-based MDT, if the selected PLMN of the UE is the HPLMN of the UE, the EHPLMN of the UE, or the equivalent PLMN of the HPLMN or EHPLMN, the base station acquires the MDT configuration information of the MDT and performs MDT measurement according to the acquired MDT configuration information. do.

Alternatively, the PLMN list may be independently defined for MDT, and is referred to as an MDT PLMN list, and this list includes the IDs of the PLMN group and indicates a range of PLMNs for which MDT measurement continuity is supported.

Hereinafter, six preferred embodiments will be described in detail.

A first embodiment is provided.

In the first embodiment, when S1 handover is performed, the MME transmits user authorization information, MDT configuration information, HPLMN ID and EHPLMN ID to the eNB. In the case of management-based MDT, at least user authorization information needs to be transmitted; In the case of signaling-based MDT, at least MDT configuration information needs to be transmitted. By using this method, the continuity of MDT in different PLMNs is implemented. The first embodiment is shown based on FIG. 3. The method shown in Fig. 3 includes the following steps.

Step 301: The source eNB transmits a handover demand message to the MME. The principle of determining the S1 handover is the same as the current mechanism, and the S1 handover is determined according to the measurement report of the UE and the resource management strategy of the source eNB. The handover request message includes the ID of the target eNB and the target area ID (TAI) selected by the source eNB for the UE, and the TAI includes the ID of the selected PLMN of the UE.

Step 302: The MME transmits a handover request to the target eNB.

In step 301, when the selected PLMN of the UE is the HPLMN of the UE, the EHPLMN of the UE, the HPLMN or the equivalent PLMN of the EHPLMN, the MME may configure the UE to start MDT measurement of the target PLMN or continue MDT measurement.

Currently, supported MDTs include management-based MDT and signaling-based MDT.

In the case of management-based MDT, when the selected PLMN of the UE is the HPLMN of the UE, the EHPLMN of the UE, or the equivalent PLMN of the HPLMN or EHPLMN, the MME checks the user authorization information of the UE, and the user authorization information performs MDT measurement by the user. It indicates whether it can be done. If the user can perform MDT measurement, the MME sends user authorization information (called management-based MDT allowed information in the S1 interface) to the target base station through a handover request message. Otherwise, the target base station by the MME The handover request message transmitted to the network does not include "management-based MDT allowed" information.

In the case of signaling-based MDT, when the source eNB initiates the signaling-based MDT, the MDT type is immediately MDT, and the selected PLMN of the UE is the HPLMN of the UE, the EHPLMN of the UE, or the equivalent PLMN of the HPLMN or EHPLMN, the MME Transmits a handover request message carrying MDT configuration information of the MDT to the target eNB. The MDT configuration information is the same as the configuration information sent to the source eNB. The target eNB checks whether the target cell is in the range set in the MDT configuration information, and if the target cell is in the range set in the MDT configuration information, the target cell can continue to receive the measurement report sent by the UE; Otherwise, the target cell may initiate the MDT termination procedure and transmit a trace deactivation message to the MME. Since the target cell of the target eNB can continuously receive the MDT measurement report of the UE, MDT can be continuously performed in the target cell.

If the source eNB does not initiate the signaling-based MDT, the MME may initiate a new MDT measurement and transmit a handover request message carrying MDT configuration information of the MDT to the target eNB.

The handover request message sent by the MME may also include the HPLMN ID and/or EHPLMN ID of the UE. Using this information, in a subsequent X2 handover, the eNB can determine whether to transmit MDT configuration information and/or user authorization information to the target eNB, which will be described in the third embodiment. Also, the eNB can determine whether the MDT configuration information received from other network entities is legitimate by using this information. If the PLMN corresponding to the PLMN ID included in the TR of MDT configuration information is the HPLMN of the UE, the EHPLMN of the UE, the HPLMN or the equivalent PLMN of the EHPLMN, the received MDT configuration information is legal, otherwise the eNB ignores the MDT configuration information. .

Step 303: The target eNB stores information in the handover request message, and transmits a handover request response message to the MME. The handover request response message includes established bearer information, bearer information to be erased, and a transparent transmission container from the source to the target, and the container includes information to be transmitted to the UE through the source eNB. do.

Step 304: The MME transmits a handover command to the source eNB. The handover command includes bearer information and a transparent transport container from the source to the target.

Step 305: The source eNB transmits a handover command message to the UE.

Step 306: After completing synchronization with the target cell, the UE transmits a handover complete message to the target eNB. Can begin to transmit uplink and downlink data.

Step 307: The target eNB sends a handover notification to the MME.

The S1 handover procedure is completed.

* A second embodiment is provided.

In the second embodiment, when X2 handover is performed, the MME transmits user authorization information, MDT configuration information, HPLMN ID and EHPLMN ID to the eNB. In the case of management-based MDT, it is necessary to transmit at least user authorization information; In the case of signaling-based MDT, it is necessary to transmit at least MDT configuration information. By using this method, the continuity of MDT is implemented in different PLMNs. The second embodiment will be described based on FIG. 4. The method shown in Fig. 4 includes the following steps.

Step 401: The source eNB transmits a handover request message to the target eNB. The handover request message includes the ID of the target cell, the ID of the selected PLMN of the UE, and bearer information to be set.

Step 402: The target eNB transmits a handover response message to the target eNB. The message contains bearer information that can be established and a transparent transport container from the source to the target, which container contains the information to be transmitted to the UE.

Step 403: The source eNB transmits a handover command to the UE.

Step 404: After completing synchronization with the target cell, the UE transmits a handover complete message to the target eNB. Can begin to transmit uplink and downlink data.

Step 405: The target eNB transmits a path handover request message to the MME. This message contains the TAI, and the TAI contains the ID of the selected PLMN of the UE.

Step 406: The MME transmits a path handover request response message to the target eNB.

In this step, the MME determines whether the current target PLMN of the UE is the HPLMN of the UE, the EHPLMN of the UE, or the equivalent PLMN of HPLMN or EHPLMN, or belongs to the PLMN list of the MDT.

In the case of management-based MDT, if the determination result is “Yes”, the MME checks user authorization information indicating whether the user performs MDT measurement. If the user can perform MDT measurement, the MME sends "management-based MDT allowed" information to the target base station through a path handover request response message; Otherwise, the handover request response message transmitted by the MME to the target base station does not include "management-based MDT allowed" information.

In the case of signaling-based MDT, if the source eNB initiates the signaling-based MDT, the type of MDT is immediately MDT, and the selected PLMNE of the UE is the HPLMN of the UE, the EHPLMN of the UE, or the equivalent PLMN of HPLMN or EHPLMN, or MDT. If it belongs to the PLMN list, the MME sends a path handover request response carrying MDT configuration information of the MDT to the target eNB. The MDT configuration information is the same as the configuration information sent to the source eNB. The target eNB checks whether the target cell is in the range set in the MDT configuration information, and if the target cell is in the range set in the MDT configuration information, the target cell can continue to receive the measurement report transmitted by the UE. MDT can be performed continuously.

The X2 handover procedure is completed.

In the above description, user authorization information and/or MDT configuration information is transmitted to the eNB during the handover procedure. In a detailed implementation, user authorization information and/or MDT configuration information may be transmitted to the eNB after handover procedures are finished. After the handover procedure is complete, when the UE switches to the eNB of another PLMN, the TA update procedure needs to be initiated, and the UE receives the TA update request message (TA update request message) transmitted by the UE. , Transmits a TA update request message to the MME, the MME transmits a downlink non-access layer transmission message to the eNB, and this message includes a TA update confirmation message to be transmitted to the UE, This message may also include user authorization information and/or MDT configuration information. Alternatively, after the handover procedure is completed, the MME transmits an initial context modification request message to the eNB, and this message includes user authorization information and/or MDT configuration information.

A third embodiment is provided.

In the third embodiment, when X2 handover is performed, the source eNB transmits user authorization information, MDT configuration information, HPLMN ID and EHPLMN ID to the target eNB. In the case of management-based MDT, it is necessary to transmit at least user authorization information; In the case of signaling-based MDT, it is necessary to transmit at least MDT configuration information. By using this method, the continuity of MDT is implemented in different PLMNs. The third embodiment will be described based on FIG. 5. The method shown in Fig. 5 includes the following steps.

Step 501: The source eNB transmits a handover request message to the target eNB. The handover request message includes the target cell, the ID of the selected PLMN of the UE, bearer information to be set, and the like.

In this step, the source eNB needs to determine whether the selected target PLMN of the UE is the HPLMN of the UE, the EHPLMN of the UE, or the equivalent PLMN of HPLMN or EHPLMN, these are the list of HPLMN, EHPLMN and ePLMN stored in the eNB. It can be performed according to.

The eNB may obtain the HPLMN and EHPLMN IDs of the UE from the handover request message transmitted by the MME through step 302 in the first embodiment, or the eNB transmits by the MME through step 703 in the fifth embodiment. The HPLMN and EHPLMN IDs of the UE can be obtained from the initial context setting request message, and the HPLMN and EHPLMN IDs of the UE will be transmitted to the source eNB through the X2 handover request message in the X2 handover procedure described in the embodiment. I can. The ePLMN list is also obtained through the above three messages, and the corresponding messages in the current protocol include the ePLMN list.

In the case of management-based MDT, if the selected PLMN is the HPLMN of the UE, the EHPLMN of the UE, the HPLMN, or the equivalent PLMN of the EHPLMN, the source eNB sends the handover request message to the target base station (management-based MDT allowed information in X2). Transmitting user authorization information); Otherwise, the handover request message transmitted by the source eNB to the target base station does not include "management-based MDT allowed" information.

In the case of signaling-based MDT, if the source eNB initiates the signaling-based MDT, the MDT type is immediately MDT, and the selected PLMNE of the UE is the HPLMN of the UE, the EHPLMN of the UE, or the equivalent PLMN of the HPLMN or EHPLMN, the source The eNB needs to transmit a handover request message carrying MDT configuration information of the MDT to the target eNB. The target eNB checks whether the target cell is in the range set in the MDT configuration information, and if the target cell is in the range set in the MDT configuration information, the target cell can continue to receive the measurement report transmitted by the UE. MDT can be performed continuously.

The handover request message sent by the source eNB may also include the HPLMN ID and/or EHPLMN ID of the UE. By using this information, in a subsequent X2 handover, the eNB can determine whether to transmit MDT configuration information and/or user authorization information to the target eNB.

Step 502: The target eNB transmits a handover response message to the source eNB. The handover response message includes bearer information and a transparent transport container that can be set from a source to a target. The container contains information transmitted to the UE.

Step 503: The source eNB transmits a handover command message to the UE.

Step 504: After completing synchronization with the target cell, the UE transmits a handover complete message to the target eNB. Can begin to transmit uplink and downlink data.

Step 505: The target eNB transmits a path handover request message to the MME. The message includes the TAI, and the TAI includes the ID of the selected PLMN of the UE.

Step 506: The MME transmits a path handover request response message to the target eNB.

The X2 handover procedure is completed.

A fourth embodiment is provided.

In the fourth embodiment, a method of selecting the UE to perform MDT measurement by the eNB after the eNB acquires user authorization information using the method of the first, second, third or fifth embodiment will be described. Using this method, as long as the PLMN is the PLMN of the UE, the EHPLMN of the UE, or the equivalent PLMN of the PLMN or EHPLMN when the UE moves to another PLMN, UE can be selected. The fourth embodiment will be described based on FIG. 6. The method shown in Fig. 6 includes the following steps.

Step 601: The MME transmits user authorization information to the eNB.

This step may be step 302 of the first embodiment, step 406 of the second embodiment, step 703 of the fifth embodiment, or step 501 of the third embodiment, in which the source eNB transmits the user authorization information to the target eNB.

Step 602: The EM transmits MDT configuration information to the eNB.

MDT configuration information includes MDT location selection conditions, reporting mechanism configuration, IP addresses of TR and TCE, operation type, MDT data anonymity, and the like.

Step 603: The eNB selects a UE for performing MDT measurement according to area information from MDT configuration information and user authorization information.

As long as the location of the UE satisfies the requirements of the area information and the user authorization information is configured to be approved, the eNB may select the UE to perform MDT measurement; Otherwise, the UE cannot be selected to perform MDT measurement.

A fifth embodiment is provided.

The fifth embodiment describes how the UE reports the MDT report, the eNB stores the MDT report and sends the report to the TCE. By using the above method, continuity of MDT is implemented in different PLMNs, and MDT measurement records can be reported to the eNB. The fifth embodiment will be described based on FIG. 7. The method shown in Fig. 7 includes the following steps.

Step 701: In the RRC setup procedure, the UE reports to the eNB an indication indicating that the user has saved the MDT record. Three messages are included in the RRC setup procedure, and these messages are an RRC request message sent by the UE to the eNB, an RRC setup message sent by the eNB to the UE, and an RRC setup completion message sent by the UE to the eNB. The RRC configuration complete message includes a non-access layer message and an ID indicating whether the UE has stored the MDT report.

Step 702: The eNB sends an initial UE message to the MME, this message includes the non-access layer message sent by the UE and the TAI, and the TAI includes the ID of the PLMN selected for the UE. .

Step 703: The MME determines whether the PLMN selected for the UE is the HPLMN of the UE, the EHPLMN of the UE, or an equivalent PLMN of HPLMN or EHPLMN, and if yes, the MME checks the user authorization information of the UE and , The user authorization information indicates whether the user can perform MDT measurement. When the user can perform MDT measurement, the MME transmits user authorization information to the eNB through an initial context setup message; Otherwise, the initial context setting message information does not include "management-based MDT allowed" information.

If the PLMN selected for the UE is the HPLMN of the UE, the EHPLMN of the UE, or an equivalent PLMN of HPLMN or EHPLMN, the initial context setup message may also include an HPLMN ID and an EHPLMN ID. By using the HPLMN ID and EHPLMN ID, the eNB can determine whether to transmit MDT configuration information and user authorization information to the target eNB when performing X2 handover.

Step 704: If it indicates that the UE has saved the MDT record, the eNB stores the information received from the MME, the eNB also stores the user authorization information of the UE, and the eNB requests the UE to send the MDT record to the eNB. Sends a requesting UE information request message to the UE. If the eNB does not have the user authorization information of the UE, the eNB does not transmit a UE information request message to the UE. The eNB may also determine whether to request a report of the MDT record from the UE according to the IDs of the HPLMN and EHPLMN included in the message at step 703. When the selected PLMN of the UE is the HPLMN of the UE, the EHPLMN of the UE, or the equivalent PLMN of the HPLMN or EHPLMN, the eNB transmits a UE information request message to the UE and requests the UE to transmit an information report message.

Step 705: The UE sends an MDT report to the eNB. The MDT report includes TR, TRST, TCE ID and MDT records.

Step 706: The eNB finds out the IP address of the TCE corresponding to the TCE ID according to the TCE ID in the MDT report and the PLMN ID included in the TR, and sends the MDT report to the TCE according to a preset reporting mechanism.

In the above embodiments, the IDs of the ePLMN list, HPLMN and EHPLMN, which are always defined in the current related protocol, are used by the MDT to determine consecutive PLMNs. Hereinafter, another method provided by the present invention will be described.

In the method, the core network defines an MDT PLMN list and transmits the MDT PLMN list to the eNB through a tracking activation request message or an initial context setting request message. In X2 handover, the source eNB determines whether the ID of the target PLMN is in the list according to the MDT PLMN list, and when the target PLMN is in the MDT PLMN list, the MDT configuration information and/or user authorization information and the MDT PLMN list are transmitted to the eNB; If the target PLMN is not in the MDT PLMN list, the MDT configuration information and/or user authorization information and the MDT PLMN list are not transmitted to the eNB. The MME may perform the determination according to the MDT PLMN list, and, as described in the above embodiment, may perform the corresponding processing according to the determination result.

When the source eNB and the target eNB support different versions, if the source eNB supports version 10, the target eNB supports version 11, and the X2 handover request message transmitted by the eNB supporting version 10 is version Since the message of 10 does not support this feature, it cannot contain the MDT PLMN list, and in this way, the source eNB cannot send the MDT PLMN list to the target eNB. If the target eNB supports version 11, the target eNB cannot perform the determination according to the MDT PLMN list in the subsequent X2 handover, and thus cannot continuously perform MDT measurement.

The sixth embodiment describes a method of continuously measuring MDT when the source eNB and the target eNB belong to the same PLMN, but the source eNB supports version 10 and the target eNB supports version 11. The sixth embodiment will be described based on FIG. 8. The method shown in Fig. 8 includes the following steps.

Step 801: The MME transmits MDT configuration information to the eNB, and MDT configuration information may be transmitted to the eNB through a tracking activation request message, an initial context setting request message, or a handover request message.

The MME transmits user authorization information of the UE to the eNB, and the user authorization information may be transmitted to the eNB together with MDT configuration information or through a different procedure. The message for transmitting the user authorization information may include an initial context setting request message or a handover request message.

When transmitting user authorization information or MDT configuration information, the MME may also transmit the MDT PLMN list. If the MME knows that the eNB supports the version 10 according to the configuration information, the message does not include the MDT PLMN list because the eNB supporting the version 10 cannot accurately analyze the MDT PLMN list.

Step 802: If the UE determines that it needs to perform X2 handover, the source eNB transmits a handover request message to the target eNB. The handover request message includes the ID of the target cell, the ID of the selected PLMN of the UE, and bearer information to be set.

In the case of management-based MDT, if the target PLMN and the source PLMN are the same or the selected PLMN is in the MDT PLMN list, the source eNB sends a handover request message with user authorization information (also referred to as management-based MDT allowed information in X2). Send to the target base station via; Otherwise, the handover request message transmitted by the source eNB to the target base station does not include "management-based MDT allowed" information.

In the case of signaling-based MDT, if the source eNB initiates the signaling-based MDT, the MDT type is immediately MDT, and the selected target PLMN and the source PLMN are the same, or if the selected target PLMN is in the MDT PLMN list, the source eNB is A handover request message carrying MDT configuration information of the MDT is transmitted to the target eNB. The target eNB may check whether the target cell is in the range set in the MDT configuration information, and if the target cell is in the range set in the MDT configuration information, the target cell may continue to receive the measurement report sent by the UE, and Therefore, MDT can be continuously performed in the target cell.

If the source eNB supports version 11 and the selected target PLMN and source PLMN are the same, or if the selected target PLMN is in the MDT PLMN list, the handover request message includes MDT configuration information and/or user authorization information of the UE and the MDT PLMN list. Includes.

When the source eNB supports version 10 and the selected target PLMN and source PLMN are the same, the handover request message includes MDT configuration information and/or user authorization information of the UE.

Step 803: The target eNB transmits a handover response message to the source eNB. This message contains a transparent transport container and bearer information that can be set from the source to the target.

Step 804: The source eNB transmits a handover command message to the UE.

Step 805: After completing synchronization with the target cell, the UE transmits a handover completion message to the target eNB. Can begin to transmit uplink and downlink data.

Step 806: The target eNB transmits a path handover request message to the MME. This message includes the TAI, and the TAI includes the ID of the selected PLMN of the selected UE. If the target eNB supports version 11 and is transmitted by the source eNB and receives MDT configuration information and/or user authorization information without the MDT PLMN list, the path handover request message also requires the MME to send the MDT PLMN list to the eNB. It may include an indication of "requires MDT PLMN list" to indicate that there is.

Step 807: The MME transmits a path handover request response message to the target eNB. If the message in step 806 includes an indication of "MDT PLMN list required", the path handover request response message also includes the MDT PLMN list.

Alternatively, in step 807, the MDT PLMN list cannot be included in the path handover request response message, but may be included in the initial context modification message transmitted by the MME after step 807.

As can be seen from the above embodiments, in the method for implementing the continuity of MDT provided by the present invention, the UE authorization information belongs to the range of the HPLMN of the UE, the EHPLMN of the UE, or the equivalent PLMN of the HPLMN or EHPLMN. By being sent to the eNB, the eNB can select a UE to perform MDT measurement in this range. The IDs of HPLMN and EHPLMN can be transmitted to the eNB and MDT records can be received from the UE so that the UE can move between the eNBs in HPLMN, EHPLMN or equivalent PLMN of HPLMN or EHPLMN, so that HPLMN, EHPLMN, or equivalent PLMN's It supports MDT measurement in a range and can implement MDT continuity.

What has been described above is only a preferred embodiment of the present invention. Those skilled in the art will appreciate that improvements and modifications are possible within the principles of the present invention, and those improvements and modifications should be included in the protection scope of the invention.

Claims (10)

As a method for implementing MDT continuity of a base station by applying management-based MDT (minimization of drive tests),
Receiving from a core network entity a first message including a list of MDT PLMNs including at least one public land mobile network (PLMN) allowed for MDT, wherein the first message is a PLMN serving a terminal Receiving the first message, further comprising an identifier of;
Selecting a terminal for collecting MDT data based on the MDT PLMN list and an identifier of the PLMN serving the terminal; And
Including the step of transmitting MDT configuration (configuration) information to the selected terminal,
The MDT PLMN list includes an identifier of the at least one PLMN, the MDT PLMN list is associated with a management-based MDT,
When the identifier of the PLMN serving the terminal is included in the MDT PLMN list, the terminal is selected,
The method includes at least one of information of a trace collection entity (TCE) internet protocol (IP) address, trace reference (TR) information, or work type information, and trace activation Receiving a third message for the request from element management (EM); And
Transmitting a cell traffic trace message including at least one of the TCE IP address information, the TR information, or trace recording session reference (TRSR) information to a core network entity. The method characterized in that it further comprises. The method of claim 1,
Receiving an indicator indicating that the terminal stores the MDT record from the terminal; And
And transmitting a second message requesting to transmit the stored MDT record to the terminal. The method of claim 1,
The base station is a base station in a radio resource control (RRC) setup procedure,
Receiving the first message,
In the RRC setup procedure, comprising the step of receiving an initial context setup message including the MDT PLMN list from a core network entity. The method of claim 1, wherein the first message is a message for requesting terminal context setting. The method of claim 1,
Wherein the MDT PLMN list includes a management-based MDT PLMN list. In the base station implementing MDT continuity applying management-based MDT (minimization of drive tests),
A transmission/reception unit; And
A first message including an MDT PLMN list including at least one public land mobile network (PLMN) allowed for MDT is received through the transceiver, and the first message is an identifier of a PLMN serving a terminal Further comprising, selecting a terminal for collecting MDT data based on the MDT PLMN list and the identifier of the PLMN serving the terminal, and transmitting MDT configuration information to the selected terminal through the transceiver Including a control unit,
The MDT PLMN list includes an identifier of the at least one PLMN, the MDT PLMN list is associated with a management-based MDT,
When the identifier of the PLMN serving the terminal is included in the MDT PLMN list, the terminal is selected,
The control unit includes at least one of information of a trace collection entity (TCE) internet protocol (IP) address, trace reference (TR) information, or work type information, to enable tracking. A third message for the request is received from the element management (EM) through the transmission/reception unit, and at least one of information of the TCE IP address, the TR information, or trace recording session reference (TRSR) information A base station comprising transmitting a cell traffic trace message, including one, to a core network entity through the transmission/reception unit. The method of claim 6,
The control unit receives an indicator from the terminal through the transmission/reception unit indicating that the terminal stores the MDT record, and transmits a second message requesting the terminal to transmit the stored MDT record through the transmission/reception unit. The base station, characterized in that. The method of claim 6,
The base station is a base station in a radio resource control (RRC) setup procedure,
Wherein the control unit receives an initial context setup message including the MDT PLMN list from a core network entity through the transmission/reception unit in an RRC setup procedure. The method of claim 6,
The first message is a base station, characterized in that the message for requesting the terminal context setting. The method of claim 6,
The base station, characterized in that the MDT PLMN list includes a management-based MDT PLMN list.

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