Protection of mission-critical push-to-talk multimedia broadcast and multicast service subchannel control messages
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsIvo Sedlacek, Jörgen Axell, Noamen Ben Henda
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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.
Claims20
A method of operating a Mission-Critical Push-To-Talk (MCPTT) node connected to user equipments (UEs), comprising:
- generating a Multimedia Broadcast and Multicast Service (MBMS) Subchannel Control Key (MSCCK) when activating a MBMS bearer;
- sending one or more first messages to the UEs in unicast, wherein the one or more first messages include the generated MSCCK;
- generating at least one MBMS subchannel control message;
- applying integrity protection and/or confidentiality protection to the at least one MBMS subchannel control message with the MSCCK;
- and
- sending the at least one MBMS subchannel control message in broadcast.
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 one or more first messages from the MCPTT node in unicast when activating a MBMS bearer, wherein the one or more first messages comprises a Multimedia Broadcast and Multicast Service (MBMS) Subchannel Control Key (MSCCK);
- identifying the MSCCK from the one or more first messages;
- and
- receiving an MBMS subchannel control message from the MCPTT node;
- and
- decrypting and/or integrity checking the MBMS subchannel control message using the MSCCK.
A Mission-Critical Push-To-Talk (MCPTT) node equipped to be connected to user equipments (UEs) comprising MCPTT clients to be served by the MCPTT node, comprising:
- a key management module adapted to generate Multimedia Broadcast and Multicast Service (MBMS) Subchannel Control Keys (MSCCKs) when activating a MBMS bearer;
- a PTT message generator module adapted to generate first messages to be sent in unicast to the UEs, wherein the first messages contain the MSCCKs, and further adapted to generate MBMS subchannel control messages and apply integrity protection and/or confidentiality protection to the MBMS subchannel control messages;
- and
- a transmission module configured to send the MBMS subchannel control messages in broadcast.
A Mission-Critical Push-To-Talk (MCPTT) node equipped to be connected to a user equipments (UEs) comprising MCPTT clients served by the MCPTT node, comprising:
- processing circuitry, memory, and transceiver circuitry collectively configured to:
- generate a Multimedia Broadcast and Multicast Service (MBMS) Subchannel Control Key (MSCCK) when activating a MBMS bearer;
- send first messages to the UEs in unicast, wherein the first messages include the generated MSCCK;
- generate at least one MBMS subchannel control message;
- apply integrity protection and/or confidentiality protection to the at least one MBMS subchannel control message with the MSCCK;
- and
- send the at least one MBMS subchannel control message in broadcast.
Dependencies are inferred from the claim text.