[e2e] HARQ

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 this correct?

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.

Do you need help?
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Can someone help me out here?

Thanks!

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