Protection of mission-critical push-to-talk multimedia broadcast and multicast service subchannel control messages
AssigneeTelefonaktiebolaget L M 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.
Claims30
A method of operating a Mission-Critical Push-To-Talk (MCPTT) node connected to a group of user equipments (UEs) served by the MCPTT node, comprising:
- generating a Multimedia Broadcast and Multicast Service (MBMS) Subchannel Control Key (MSCCK);
- sending first messages to the UEs in unicast, wherein the 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 multicast.
A method of operating a UE connected to a Mission-Critical Push-To-Talk (MCPTT) node that serves the UE, comprising:
- receiving a first message from the MCPTT node in unicast, wherein the first message comprises a Multimedia Broadcast and Multicast Service (MBMS) Subchannel Control Key (MSCCK);
- identifying the MSCCK from the message;
- 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 a group of user equipments (UEs) 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);
- 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 multicast.
A User Equipment (UE) equipped to be connected to a serving Mission-Critical Push-To-Talk (MCPTT) node, comprising:
- a push-to-talk (PTT) message handler module adapted to receive a first message in unicast from a serving MCPTT node, wherein the first message contains a Multimedia Broadcast and Multicast Service (MBMS) Subchannel Control Keys (MSCCK);
- a key management module adapted to extract the MSCCK from said first message,
- wherein the PTT message handler module is further adapted to receive MBMS subchannel control messages in broadcast and apply integrity protection and/or confidentiality protection to the received MBMS subchannel control messages using the MSCCK.
A Mission-Critical Push-To-Talk (MCPTT) node equipped to be connected to a group of user equipments (UEs) 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);
- 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 multicast.
A user equipment (UE) equipped to be connected to a Mission-Critical Push-To-Talk (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, wherein the first message comprises a Multimedia Broadcast and Multicast Service (MBMS) Subchannel Control Key (MSCCK);
- identify the MSCCK from the message;
- and
- 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.
Dependencies are inferred from the claim text.