detlef.bosau at web.de
Mon Aug 27 01:23:55 PDT 2007
Hi to all.
I have some HARQ issues, I do not fully understand.
First of all, there are three kinds of HARQ. I do not fully understand
the difference between HARQ Type 1 and ordinary ARQ (without a buzzy H
in the beginning).
The other two types are incremental redundancy and chase combining. Is
Now, HARQ often comes with adaptive channel coding.
To my understanding, chase combining requires any sending attempts for
one PDU to be coded identically, in particular the MSCS/PS must not be
changed for different sending attempts for the same PDU, although the
channel properties may change in between.
Another concern is whether we have are restricted to a stop and wait
scheme with IR / Chase combining. I don´t know a possibility to use
sliding window here, because a receiver must know, which received Frames
belong to the same original PDU.
This is particularly important as I´ve learned that in HSDPA the RLC
endpoints are the RNC and the UE.
So, there is a transport line (Iub) between RNC and BS introduces
storage capacity into the path and which makes the use of a stop´n wait
scheme here questionable.
Can someone help me out here?
Detlef Bosau Mail: detlef.bosau at web.de
Galileistrasse 30 Web: http://www.detlef-bosau.de
70565 Stuttgart Skype: detlef.bosau
Mobile: +49 172 681 9937
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