Implicit spatial replay protection

• US 10,638,412 B2
• Filed: 11/24/2016
• Issued: 04/28/2020
• Est. Priority Date: 01/25/2016
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Ben Henda, Noamen, Lehtovirta, Vesa, Pfeffer, Katharina, Sultana, Shabnam, Torvinen, Vesa, Wifvesson, Monica
• Primary Examiner(s): Phuong, Dai
• Application Number:
  US16/069,943
• Publication Number:
  US 20190069227A1
• Time in Patent Office: 1,251 Days
• Field of Search: 455410-411, 455457, 4554561-4563
• CPC Class Codes: H04W 12/106 Packet or message integrity
• CPC Class Codes: H04W 4/021 Services related to particular areas, e.g. point of interest [POI] services, venue services or geofences
• 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 4/029 Location-based management or tracking services
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 76/14 Direct-mode setup

Abstract

A terminal device obtains grid location information relating to a cell of a predetermined grid in which the terminal device is located. The terminal device then calculates a message integrity code based on the grid location information and transmits a proximity service discovery message. The discovery message includes the calculated message integrity code and does not include the grid location information. A second terminal device receives the proximity service discovery message. The second terminal device then obtains grid location information relating to at least one cell of a predetermined grid within a predetermined distance of a location of the second terminal device, calculates at least one message integrity code based on the grid location information, and determines whether a calculated message integrity code matches the message integrity code in the received discovery message. The second terminal device then acts on the received discovery message only if there is a match.

Claims

1. A method of operation of a terminal device, comprising:

receiving a proximity service discovery message containing a message integrity code;

obtaining grid location information relating to at least one cell of a predetermined grid within a predetermined distance of a location of the terminal device;

calculating at least one message integrity code based on the grid location information;

determining whether a calculated message integrity code matches the message integrity code in the received discovery message; and

acting on the received proximity service discovery message only if a calculated message integrity code matches the message integrity code in the received discovery message.

2. A method according to claim 1, wherein the predetermined distance is a multiple of a range of a proximity service to which the proximity service discovery message relates.

3. A method according to claim 1, comprising calculating the at least one message integrity code based also on a payload of the proximity service discovery message.

4. The method of claim 1, wherein the received proximity service discovery message does not include location information of a terminal device which transmitted the proximity service discovery message.

5. A terminal device for use in a communications network, the terminal device comprising a processor circuit, and a memory, the memory containing instructions executable by the processor circuit, such that the terminal device is operable to:

receive a proximity service discovery message containing a message integrity code;

obtain grid location information relating to at least one cell of a predetermined grid within a predetermined distance of a location of the terminal device;

calculate at least one message integrity code based on the grid location information;

determine whether a calculated message integrity code matches the message integrity code in the received discovery message; and

act on the received proximity service discovery message only if a calculated message integrity code matches the message integrity code in the received discovery message.

6. A terminal device according to claim 5, wherein the predetermined distance is a multiple of a range of a proximity service to which the proximity service discovery message relates.

7. A terminal device according to claim 5, the memory contains further instructions executable by the processor circuit, such that the terminal device is operable to calculate the at least one message integrity code based also on a payload of the proximity service discovery message.

8. The terminal device of claim 5, wherein the received proximity service discovery message does not include location information of a terminal device which transmitted the proximity service discovery message.

9. A method of operation of a network node, comprising:

receiving a request for proximity service resources from a terminal device; and

sending a response to the terminal device granting the requested proximity service resources, with a requirement that the terminal device includes a message integrity code in any transmitted proximity service discovery message, wherein the message integrity code is calculated using grid location information relating to a cell of a predetermined grid in which the terminal device is located.

10. A method according to claim 9, comprising informing the terminal device of the predetermined grid.

11. A network node for use in a communications network, the network node comprising a processor circuit, and a memory, the memory containing instructions executable by the processor circuit, such that the network node is operable to:

receive a request for proximity service resources from a terminal device; and

send a response to the terminal device granting the requested proximity service resources, with a requirement that the terminal device includes a message integrity code in any transmitted proximity service discovery message, wherein the message integrity code is calculated using grid location information relating to a cell of a predetermined grid in which the terminal device is located.

12. A network node according to claim 11, wherein the memory further contains instructions executable by the processor circuit, such that the terminal device is operable to:

inform the terminal device of the predetermined grid.