name: SYNC
full_form: MBMS synchronisation protocol
context: Each involved node is configured with the connections that need to be setup. ASP 1 ASP 2 SG SEP (Primary) (Backup) |------Establish SCTP Association------| |-Estab. SCTP Assoc-| |--Align SS7 link---| Each IP SEP declares to the SG that it is running. +----------------ASP Up----------------> <--------------ASP Up Ack--------------+ +------ASP Up-------> <---ASP Up Ack------+ The Primary IP SEP declares to the SG that it is active. The SG notifies all IP SEPs. +-------------ASP Active---------------> <----------ASP Active Ack--------------+ <----------NTFY (ASP Active)-----------+ <-NTFY (ASP Active)-+ The SG represents the availability of ASP 1 to the SEP. +--------SSA--------> The SEP declares its availability to the SG. Similarly, the SG informs the active ASP of the availability of the SEP as dictated by SGs concerned list. N.B. The SG maps the SS7 address of the SEP to an IP address, which the SG knows ASP 1 will understand. <--------SSA--------+
description: The MBMS synchronisation protocol, abbreviated as SYNC, is a protocol used in the steady-state phase of cell synchronization. It defines when cell sync bursts shall be transmitted and received, enabling normal traffic support and regular cell synchronization monitoring and update in parallel to ongoing UE connections.
explanation: SYNC is classified as a Protocol because it defines synchronisation schedules, transmission parameters, and receiving parameters for cell sync bursts. Its role in establishing a synchronisation schedule, measuring reports, and adjusting synchronisation procedures further confirms its classification as a protocol.
section_title: 6.2.2	Steady-State Phase
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