Re: [rohc] "expect" ACKs in O-mode.

["Lars-Erik Jonsson" <lars-erik.jonsson@ericsson.com>]

>Lars-Erik,
>
>I am not sure I understand what it means to "expect" ACKs.
>Either we remove the stuff about expecting, or else we
>explain what it means to expect an ACK. Do you have a proposal?


First after reception of an ack for a PT2 packet, the compressor should expect
to get such acks for all PT2 events. This means that usage of PT2 acks must not
be pre-negotiated. How the compressor is supposed to make use of PT2 acks should
not be defined but up to the implementation to decide. That is my position.....

/L-E



>
>5.4.1.1.2.  Optional acknowledgments, upwards transition
>
>In addition to NACKs, also positive feedback (ACKs)
>MAY be used for PT2 packets in the bi-directional
>optimistic mode. Upon reception of an ACK, the
>ompressor knows that the decompressor has received
>the acknowledged packet and transition to a higher
>compression state can be carried out immediately.
>This functionality is optional, so a compressor MUST
>NOT expect to get such ACKs initially. First after
>reception of an acknowledgement for a PT2 packet, the
>compressor can expect to get ACKs for such packets
>also after that.
>
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