The channel remains reserved until the
core nodes receive a release message that follows the transmitted DB. Therefore, for
each channel, only an on/off (12/02) flag should be kept in each core node to indicate
whether the channel is busy (reserved) or free (available). This scheme is usually
referred to as Explicit Setup and Explicit Release scheme.
??? Scheme.2: Each BCP contains the offset time that separates it from its corresponding
DB and the duration of that DB. Thus, the core nodes reserve the channels as soon as
they receive the BCP. Since the end of each DB is known (calculated using the duration
of the DB), the channels are reserved only until the end of the DB. This scheme
is more complex than the previous scheme, as each channel should be associated
with a timer, which indicates when the channel will become available. This scheme
is referred to as Explicit Setup and Estimated Release scheme.
??? Scheme.3: Similarly to ???scheme 1???, each BCP contains the offset time that separates
it from its corresponding DB, but not the duration of the DB, and the reserved channels
are released only when the core nodes receive the corresponding release messages.
However, the reservation of the channels starts approximately at the time of
the DBs arrivals.
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