[rtcweb] LTE using AM_RLC or UM_RLC mode for UDP?

[Harald Alvestrand <[e-mail]>]

Branching off a discussion because we seem to have two people saying 
contradictory things about something that may actually have a clear answer:

When sending an UDP packet over a random port pair across an LTE 
network, is it transferred in acknowledged mode (with L2-level 
retransmissions) or in unacknowledged mode (without retransmissions)?

The possible answers seem to be (if I understand the statements correctly):

- Acknowledged (Cameron)
- Unacknowledged (Fabio)
- "It depends"

Unlike some other arguments in the parent thread, this one seems to be 
amenable to source citations.

On 06/27/2012 11:11 PM, Fabio Pietrosanti (naif) wrote:
> On 6/27/12 10:54 PM, Cameron Byrne wrote:
>>> You are saying that in EDGE, UMTS, HSDPA when an IP stack send an UDP
>>> packet, it will handled from L2 like in the old age of GSM CSD and be
>>> automatically retransmitted?
>>>
>> Yes. LTE too.
> I read (by googling cause i don't have LTE access) that also LTE uses
> for IPTV and all other IP streaming applications the UM_RLC
> (unacknowledged mode).
>
> So also LTE should not do retransmission, unless being set in AM_RLC
> (acknowledged mode).
>
> Fabio
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