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1. (WO2018078460) PROTECTION OF MISSION-CRITICAL PUSH-TO-TALK MULTIMEDIA BROADCAST AND MULTICAST SERVICE SUBCHANNEL CONTROL MESSAGES

Pub. No.:    WO/2018/078460    International Application No.:    PCT/IB2017/052743
Publication Date: Fri May 04 01:59:59 CEST 2018 International Filing Date: Thu May 11 01:59:59 CEST 2017
IPC: H04W 12/06
H04W 12/10
H04W 4/10
Applicants: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Inventors: SEDLACEK, Ivo
AXELL, Jörgen
BEN HENDA, Noamen
Title: PROTECTION OF MISSION-CRITICAL PUSH-TO-TALK MULTIMEDIA BROADCAST AND MULTICAST SERVICE SUBCHANNEL CONTROL MESSAGES
Abstract:
A Mission-Critical Push-To-Talk (MCPTT) node (410, 510, 600, 800) is connected to a group of user equipments (UEs) (405, 505, 700, 900) served by the MCPTT node. The MCPTT node generates a Multimedia Broadcast and Multicast Service (MBMS) Subchannel Control Key (MSCCK) (S305), sends first messages to the UEs in unicast, wherein the first messages include the generated MSCCK (S310), generates at least one MBMS subchannel control message (S315), applies integrity protection and/or confidentiality protection to the at least one MBMS subchannel control message with the MSCCK (S320), and sends the at least one MBMS subchannel control message in multicast (S325).