Re: Request for clarification - Flute - flag (B)

Hello Cedric,

From RFC 5651 (LCT revised, p. 15), it is said:

---

Close Object flag (B): 1 bit

Normally, B is set to 0. The sender MAY set B to 1 when

termination of transmission of packets for an object is
imminent.

If the TOI field is in use and B is set to 1, then termination
of

transmission for the object identified by the TOI field is

imminent. If the TOI field is not in use and B is set to 1,
then

termination of transmission for the one object in the session

identified by out-of-band information is imminent. B MAY be
set

to 1 in just the last packet transmitted for the object, or B
MAY

be set to 1 in the last few seconds that packets are
transmitted

for the object. Once the sender sets B to 1 in one packet for
a

particular object, the sender SHOULD set B to 1 in all
subsequent

packets for the object until termination of transmission of

packets for the object. A received packet with B set to 1

indicates to a receiver that the sender will immediately stop

sending packets for the object. When a receiver receives a
packet

with B set to 1, then it SHOULD assume that no more packets
will

be sent for the object to the session.

---

There is no ambiguity IMHO. Upon receiving a packet with

the B flag set, the receiver SHOULD assume that transmission

of packets for this object stops, even if in practice a few

additional packets MAY arrive. Specific recovery mechanisms

(e.g. point-to-point recovery) can be launched at this point if

needed, but that's out to scope of ALC and RMT documents...

This is also the way it is implemented in our FLUTE/ALC

software.

Cheers,

Vincent

Le 14/10/10 19:06, Cedric Thienot a écrit :

Dear flute experts,

we would like to have your advice on the interpretation of the
usage of the

Close Object flag (B) specified in the RFC 3450 (page 18).

On our interpretation when this flag is set to 1 by the
transmitter, the receiver

should assume that no more packets for this object will be
broadcasted in the future?

Therefore, the receiver can stop the reception.

Thanks,

Best regards

Cedric Thienot

www.expway.com

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