# US 9,521,574 B2 · Method of anonymously reporting minimization of drive test measurements

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- Number: US 9,521,574 B2
- Document ID: US9521574B2
- Status: Granted
- Kind: B2
- Application number: 14/876,797
- Filed: 2015-10-06
- Published: 2016-02-04
- Granted: 2016-12-13
- Earliest claimed: 2011-09-29
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Hong Wang; Lixiang Xu
- Web page: https://patentgrep.com/patent/US9521574B2

## CPC

- H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports}
- H04W 12/02: Protecting privacy or anonymity, e.g. protecting personally identifiable information [PII]
- H04W 24/06: Testing, {supervising or monitoring} using simulated traffic
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

The present invention provides a method of anonymously reporting minimization of drive test (MDT) measurements. According to the method, a mobility management entity (MME) obtains MDT data anonymity configuration which indicates whether MDT measurements are to be reported anonymously at a type allocation code (TAC) level; sends a TAC of a UE to a trace collection entity (TCE) if the MDT data anonymity configuration indicates MDT measurements are to be reported anonymously at the TAC level; sends an international mobile subscriber identification (IMSI) or an international mobile equipment identity and software version (IMEISV) of the UE to the TCE if the MDT data anonymity configuration indicates other information, e.g. Trace, is adopted for anonymously reporting MDT measurements. The present invention enables an MME to send different identities of a UE to the TCE according to different requirements for anonymity to implement anonymous reporting of MDT measurements.

## Claims

### Claim 1

A method for reporting minimization of drive test (MDT) measurements by a mobility management entity (MME), the method comprising:
receiving, from a base station, a cell traffic trace message;
determining whether anonymization of MDT data is required based on the cell traffic trace message; and
transmitting, to a trace collection entity (TCE), a type allocation code (TAC) of a terminal if the anonymization of the MDT data is required, wherein the cell traffic trace message includes an interne protocol (IP) address of the TCE.

### Claim 2 (depends on 1)

The method of claim 1, wherein the cell traffic trace message further includes information indicating a logged MDT or an immediate MDT.

### Claim 3 (depends on 1)

The method of claim 1, wherein the cell traffic trace message further includes at least one of an S1 application protocol (AP) identification (ID) identifying the terminal in the base station, an S1 AP ID identifying the terminal in the MME, a trace reference (TR), or a trace recording session reference (TRSR).

### Claim 4

A mobility management entity (MME) for reporting minimization of drive test (MDT) measurements, the MME comprising:
a transceiver configured to transmit and receive related messages; and
a controller configured to:
receive, from a base station, a cell traffic trace message,
determine whether anonymization of MDT data is required based on the cell traffic trace message, and
transmit, to a trace collection entity (TCE), a type allocation code (TAC) of a terminal if the anonymization of the MDT data is required, wherein the cell traffic trace message includes an internet protocol (IP) address of the TCE.

### Claim 5 (depends on 4)

The MME of claim 4, wherein the cell traffic trace message further includes information indicating a logged MDT or an immediate MDT.

### Claim 6 (depends on 4)

The MME of claim 4, wherein the cell traffic trace message further includes at least one of an S1 application protocol (AP) identification (ID) identifying the terminal in the base station, an S1 AP ID identifying the terminal in the MME, a trace reference (TR), or a trace recording session reference (TRSR).