IP Library › Granted Patent US 10,356,566
Granted Patent B2
US 10,356,566 · App. 16/123,320 · Granted Jul 16, 2019

Protection of mission-critical push-to-talk multimedia broadcast and multicast service subchannel control messages

Inventors: Ivo Sedlacek (Hovorcovice, CZ); Jörgen Axell (Danderyd, SE); Noamen Ben Henda (Stockholm, SE)
Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
H04W4/10H04L63/0428H04L63/0876H04W12/02H04W12/06H04W12/10H04W72/0453
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Quick Facts
Patent No.
US 10,356,566
App. No.
16/123,320
Granted
Jul 16, 2019
Kind
B2
Abstract

A Mission-Critical Push-To-Talk (MCPTT) node is connected to a group of user equipments (UEs) served by the MCPTT node. The MCPTT node generates a Multimedia Broadcast and Multicast Service (MBMS) Subchannel Control Key (MSCCK), sends first messages to the UEs in unicast, wherein the first messages include the generated MSCCK, generates at least one MBMS subchannel control message, applies integrity protection and/or confidentiality protection to the at least one MBMS subchannel control message with the MSCCK, and sends the at least one MBMS subchannel control message in multicast.

Claims (28)

1. A user equipment (UE) comprising a Mission-Critical Push-To-Talk (MCPTT) client equipped to be connected to a MCPTT node that serves the UE, comprising:

processing circuitry, memory, and transceiver circuitry collectively configured to:

receive a first message from the MCPTT node in unicast when activating a Multimedia Broadcast and Multicast Service (MBMS) bearer, wherein the first message comprises a MBMS Subchannel Control Key (MSCCK);

identify the MSCCK from the message;

receive an MBMS subchannel control message from the MCPTT node; and

apply integrity protection and/or confidentiality protection to the MBMS subchannel control message using the MSCCK.

2. The UE of claim 1 , wherein decrypting and/or integrity checking the MBMS subchannel control message using the MSCCK comprises generating a message authentication code (MAC) value using the at least one MBMS subchannel control message and the MSCCK, and comparing the generated MAC value to a MAC value appended to the at least one MBMS subchannel control message.

3. The UE of claim 1 , wherein decrypting and/or integrity checking the MBMS subchannel control message using the MSCCK comprises decrypting the MBMS subchannel control message using the MSCCK.

4. The UE of claim 1 , wherein the at least one MBMS subchannel control message comprises a Map Group To Bearer message.

5. The UE of claim 1 , wherein the at least one MBMS subchannel control message comprises an Unmap Group To Bearer message.

6. A method of operating a user equipment (UE) comprising a Mission-Critical Push-To-Talk (MCPTT) client equipped to be connected to a MCPTT node that serves the UE, comprising:

receiving a first message from the MCPTT node in unicast when activating a Multimedia Broadcast and Multicast Service (MBMS) bearer, wherein the first message comprises a MBMS Subchannel Control Key (MSCCK);

identifying the MSCCK from the message;

receiving an MBMS subchannel control message from the MCPTT node; and

applying integrity protection and/or confidentiality protection to the MBMS subchannel control message using the MSCCK.

7. The method of claim 6 , wherein decrypting and/or integrity checking the MBMS subchannel control message using the MSCCK comprises generating a message authentication code (MAC) value using the at least one MBMS subchannel control message and the MSCCK, and comparing the generated MAC value to a MAC value appended to the at least one MBMS subchannel control message.

8. The method of claim 6 , wherein decrypting and/or integrity checking the MBMS subchannel control message using the MSCCK comprises decrypting the MBMS subchannel control message using the MSCCK.

9. The method of claim 6 , wherein the at least one MBMS subchannel control message comprises a Map Group To Bearer message.

10. The method of claim 6 , wherein the at least one MBMS subchannel control message comprises an Unmap Group To Bearer message.

11. A method of operating a UE comprising a Mission-Critical Push-To-Talk (MCPTT) client connected to a MCPTT node that serves the UE, comprising:

receiving a first message from the MCPTT node in unicast when activating a MBMS bearer, wherein the first message comprises a Multimedia Broadcast and Multicast Service (MBMS) Subchannel Control Key (MSCCK);

identifying the MSCCK from the message;

receiving an MBMS subchannel control message from the MCPTT node; and

decrypting and/or integrity checking the MBMS subchannel control message using the MSCCK.

12. The method of claim 11 , wherein decrypting and/or integrity checking the MBMS subchannel control message using the MSCCK comprises generating a message authentication code (MAC) value using the at least one MBMS subchannel control message and the MSCCK, and comparing the generated MAC value to a MAC value appended to the at least one MBMS subchannel control message.

13. The method of claim 11 , wherein decrypting and/or integrity checking the MBMS subchannel control message using the MSCCK comprises decrypting the MBMS subchannel control message using the MSCCK.

14. The method of claim 11 , wherein the at least one MBMS subchannel control message comprises a Map Group To Bearer message.

15. The method of claim 11 , wherein the at least one MBMS subchannel control message comprises an Unmap Group To Bearer message.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded May 24, 2019
From: SEDLACEK, IVO; BEN HENDA, NOAMEN; AXELL, JÖRGEN
To: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Reel/Frame 049282/0465 →
Continuity (3)
Division 15591934 · May 10, 2017
Provisional Application 62414890 · Oct 31, 2016
Related Publication 20190007803A1 · Jan 3, 2019