Subject: [rohc] ROHC question about list compression

From: "Sarkar, Rajib" <[email-masked]>
Date: Wed, 27 Nov 2002 15:43:03 -0800

Hi,
	I have a two-fold question about ROHC List compression.
	Q1: In the U/O mode for each index we maintain known, item and
counter pair, and we do not maintain any SNs. Now for any ACK we receive how
do we know that ack is for that pair? Taking an example, lets say we send
one type 0 packet with SN 8, in the next packet we send with an SN 9 + an
(index, item) pair to the decompressor. Now the decompressor sends an ack
for SN 8, according to the RFC we should set the (item, index) pair to known
although that is an ACK for SN 8. Does that mean we should maintain SN list
for U/O mode also?
	Q2: In the Encoding Type1 and Encoding Type 2, each item XI has the
first bit as presence bit, isn't it a redundant bit?
Thanks
Rajib
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