Subject: [rohc]How to implement W-LSB in ROHC?

From: "wool" <[email-masked]>
Date: Wed, 17 Nov 2004 15:23:53 +0800

ROHCers,
when i implement rohc,i didn't understand how to do RFC3095 rohc 4.5.2 W-LSB 
encoding,
May someone give me some examples? ex: how to use W-LSB encoding 
to do RTP SN?

for example:
SN=51=110011  SN=52=110100  SN=53=110101  SN=54=110110
UO_0_SN=0011  UO_0_SN=0100  UO_0_SN=0101  UO_0_SN=0110
but in UO_0 packet, it will "update current context of SN"
and in 5.3.2.2.5
if use ref_0 decompress SN LSB to get SN curr1,then decompressed packet
pass CRC
--> ref_-1 = ref_0, ref_0 = SN_curr1
in our emample:
assume ref_0 is 110000(SN = 48)
SN_curr1 = ref_0 + 0011 = 51
so, in 5.3.2.2.5,we will get ref_0 = SN_curr1 = 51
is it right?
if is not
how to use UO_0 in 5.3.2.2.5?
thanks....

(2)if compressor in Second Order state and in R-MODE,update packet is lost
(or ACK is lost),how the compressor to do?
because in U/O-MODE,compressor must be confident...
what to do can let compressor be confident...?

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