Method and Apparatus for Identifying Pseudo Base-Station, and Terminal

• US 20180302872A1
• Filed: 11/02/2017
• Published: 10/18/2018
• Est. Priority Date: 04/13/2017
• Status: Active Grant

• Current Assignee: Guangdong OPPO Mobile Telecommunications Corporation Limited
• Original Assignee: Guangdong OPPO Mobile Telecommunications Corporation Limited
• Inventors: Liu, Hai
• Granted Patent: US 10,462,764 B2
• Time in Patent Office: Days
• CPC Class Codes: H04W 12/122 Counter-measures against attacks; Protection against rogue devices
• CPC Class Codes: H04W 36/00224 between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]
• CPC Class Codes: H04W 4/023 using mutual or relative location information between multiple location based services [LBS] targets or of distance thresholds
• CPC Class Codes: H04W 4/025 using location based information parameters
• CPC Class Codes: H04W 60/06 De-registration or detaching
• CPC Class Codes: H04W 76/30 Connection release
• CPC Class Codes: H04W 8/12 between location registers or mobility servers

Abstract

Provided are a method and an apparatus for identifying a pseudo base-station, and a terminal and the method includes the follows. A terminal is redirected to a target cell supporting circuit domain business when receiving a first call request in a first serving cell not supporting the circuit domain business. A location area update is sent a request to a base-station where the target cell is located when LAIs stored do not include a LAI of the target cell. The terminal determines that the base-station where the target cell is located as a pseudo base-station when no message responsive to the location area update request is received from the base-station where the target cell is located during the first preset time length and the interval at which the terminal conducts a location area update as indicated by the base-station where the target cell is located meets a preset condition.

Claims

1. A method for identifying a pseudo base-station, being applicable to a terminal, the method comprising:

redirecting the terminal to a target cell supporting circuit domain business when a first call request is received in a first serving cell not supporting the circuit domain business;

sending a location area update request to a base-station where the target cell is located, when a plurality of location area identities (LAIs) stored do not comprise a LAI of the target cell, wherein the plurality of LAIs are received from a base-station where the first serving cell is located; and

identifying the base-station where the target cell is located as a pseudo base-station, when no message corresponding to the location area update request is received from the base-station where the target cell is located during a first preset time length, and an interval at which the terminal conducts a location area update as indicated by the base-station where the target cell is located is longer than a second preset time length or shorter than a third preset time length, wherein the second preset time length is longer than the third preset time length.

2. The method of claim 1, wherein redirecting the terminal to the target cell supporting the circuit domain business comprises:

receiving a redirecting list from the base-station where the first serving cell is located, wherein the redirecting list comprises frequency point information of a plurality of cells supporting the circuit domain business; and

selecting target frequency point information from the redirecting list and redirecting the terminal to the target cell having the target frequency point information.

3. The method of claim 1, further comprising:

determining that the interval at which the terminal conducts the location area update as indicated by the base-station where the target cell is located is longer than the second preset time length or shorter than the third preset time length, when a T3212 parameter value carried in a system message broadcast from the base-station where the target cell is located is smaller than a preset value.

4. The method of claim 3, wherein determining that the interval is longer than the second preset time length or shorter than the third preset time length, when the T3212 parameter value carried in the system message broadcast from the base-station where the target cell is located is smaller than a preset value comprises:

determining that the interval is longer than the second preset time length, when the T3212parameter value carried in the system message broadcast from the base-station where the target cell is located is 0;

or determining that the interval is shorter than the third preset time length, when the T3212parameter value carried in the system message broadcast from the base-station where the target cell is located is larger than 0 and smaller than the preset value.

5. The method of claim 1, further comprising:

after identifying the base-station where the target cell is located as the pseudo base-station, storing frequency point information of the first serving cell and frequency point information of the target cell correspondingly.

6. The method of claim 5, wherein storing the frequency point information of the first serving cell and the frequency point information of the target cell correspondingly comprises:

storing the frequency point information of the first serving cell and the frequency point information of the target cell into a correspondence between frequency point information of a resident cell and frequency point information of a redirecting cell; and

storing the correspondence in a database of the terminal.

7. The method of claim 5, further comprising:

after storing the frequency point information of the first serving cell and the frequency point information of the target cell correspondingly, redirecting the terminal to a cell that supporting the circuit domain business other than the target cell based on the frequency point information of the first serving cell and the frequency point information of the target cell which are stored correspondingly, when a second call request is received in a second serving cell not supporting the circuit domain business.

8. The method of claim 7, wherein redirecting the terminal to the cell supporting the circuit domain business other than the target cell based on the frequency point information of the first serving cell and the frequency point information of the target cell which are stored correspondingly comprises:

receiving a redirecting list from a base-station where the second serving cell is located, wherein the redirecting list comprises frequency point information of a plurality of cells supporting the circuit domain business;

selecting frequency point information other than the frequency point information of the target cell from the redirecting list, when frequency point information of the second serving cell is the same as the frequency point information of the first serving cell; and

redirecting the terminal to a cell having the frequency point information selected.

9. An apparatus for identifying a pseudo base-station, being applicable to a terminal, the apparatus comprising:

a first redirecting unit, configured to redirect the terminal to a target cell supporting circuit domain business when a first call request is received in a first serving cell not supporting the circuit domain business;

a sending unit, configured to send a location area update request to a base-station where the target cell is located, when a plurality of location area identities (LAIs) stored do not comprise a LAI of the target cell, wherein the plurality of LAIs are received from a base-station where the first serving cell is located; and

an identifying unit, configured to identify the base-station where the target cell is located as a pseudo base-station, when no message corresponding to the location area update request is received from the base-station where the target cell is located during a first preset time length, and an interval at which the terminal conducts a location area update as indicated by the base-station where the target cell is located is longer than a second preset time length or shorter than a third preset time length, wherein the second preset time length is longer than the third preset time length.

10. The apparatus of claim 9, wherein the first redirecting unit is further configured to:

receive a redirecting list from the base-station where the first serving cell is located, wherein the redirecting list comprises frequency point information of a plurality of cells supporting the circuit domain business; and

select target frequency point information from the redirecting list and redirect the terminal to the target cell having the target frequency point information.

11. The apparatus of claim 9, further comprising:

a determining unit, configured to determine that the interval at which the terminal conducts the location area update as indicated by the base-station where the target cell is located is longer than the second preset time length or shorter than the third preset time length, when a T3212 parameter value carried in a system message broadcast from the base-station where the target cell is located is smaller than a preset value.

12. The apparatus of claim 11, wherein the determining unit is further configured to:

determine that the interval is longer than the second preset time length, when the T3212parameter value carried in the system message broadcast from the base-station where the target cell is located is 0;

or

determine that the interval is shorter than the third preset time length, when the T3212parameter value carried in the system message broadcast from the base-station where the target cell is located is larger than 0 and smaller than the preset value.

13. The apparatus of claim 9, further comprising:

a storing unit, configured to store frequency point information of the first serving cell and frequency point information of the target cell correspondingly.

14. The apparatus of claim 13, wherein the storing unit is further configured to:

store the frequency point information of the first serving cell and the frequency point information of the target cell into a correspondence between frequency point information of a resident cell and frequency point information of a redirecting cell; and

store the correspondence in a database of the terminal.

15. The apparatus of claim 13, further comprising:

a second redirecting unit, configured to redirect the terminal to a cell supporting the circuit domain business other than the target cell based on the frequency point information of the first serving cell and the frequency point information of the target cell which are stored correspondingly, when a second call request is received in a second serving cell not supporting the circuit domain business.

16. The apparatus of claim 15, wherein the second redirecting unit further comprises:

a receiving sub-unit, configured to receive a redirecting list from a base-station where the second serving cell is located, wherein the redirecting list comprises frequency point information of a plurality of cells supporting the circuit domain business;

a selecting sub-unit, configured to select frequency point information other than the frequency point information of the target cell from the redirecting list, when frequency point information of the second serving cell is the same as the frequency point information of the first serving cell; and

a redirecting sub-unit, configured to redirect the terminal to a cell having the frequency point information selected.

17. A terminal, comprising:

at least one processor; and

a memory storing program codes, the program codes being configured to program the at least one processor to;

redirect the terminal to a target cell supporting circuit domain business when a first call request is received in a first serving cell not supporting the circuit domain business;

send a location area update request to a base-station where the target cell is located, when a plurality of location area identities (LAIs) stored do not comprise a LAI of the target cell, wherein the plurality of LAIs are received from a base-station where the first serving cell is located; and

identify the base-station where the target cell is located as a pseudo base-station, when no message corresponding to the location area update request is received from the base-station where the target cell is located during a first preset time length, and an interval at which the terminal conducts a location area update as indicated by the base-station where the target cell is located meets a preset condition.

18. The terminal of claim 17, wherein the preset condition is that the interval is longer than a second preset time length.

19. The terminal of claim 17, wherein the preset condition is that the interval is shorter than a third preset time length.

20. The terminal of claim 17, wherein the at least one processor is further programmed to:

determine that the interval at which the terminal conducts the location area update as indicated by the base-station where the target cell is located is longer than a second preset time length or shorter than a third preset time length, when a T3212 parameter value carried in a system message broadcast from the base-station where the target cell is located is smaller than a preset value.