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Re: [rtcweb] Network times . was SDP Security Descriptions (RFC 4568) and RTCWeb (UNCLASSIFIED)

"Roy, Radhika R CIV USARMY (US)" <radhika.r.roy.civ@mail.mil> Wed, 01 May 2013 19:03 UTC

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From: "Roy, Radhika R CIV USARMY (US)" <radhika.r.roy.civ@mail.mil>
To: Randell Jesup <randell-ietf@jesup.org>, "rtcweb@ietf.org" <rtcweb@ietf.org>
Thread-Topic: [rtcweb] Network times . was SDP Security Descriptions (RFC 4568) and RTCWeb (UNCLASSIFIED)
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Date: Wed, 01 May 2013 19:02:22 +0000
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Subject: Re: [rtcweb] Network times . was SDP Security Descriptions (RFC 4568) and RTCWeb (UNCLASSIFIED)
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Classification: UNCLASSIFIED
Caveats: NONE

Inline [RRR]

-----Original Message-----
From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On Behalf Of
Randell Jesup
Sent: Wednesday, May 01, 2013 2:19 PM
To: rtcweb@ietf.org
Subject: Re: [rtcweb] Network times . was SDP Security Descriptions (RFC
4568) and RTCWeb (UNCLASSIFIED)

On 5/1/2013 4:46 AM, Roy, Radhika R CIV USARMY (US) wrote:
> I am responding only on a part of this email about retransmissions of 
> audio or video packets.
>
> Let us not consider the retransmission of audio or video packets. Let 
> us consider audio or video packets are sent only over UDP. Let MOS/QoS 
> of audio or video are considered in a way that retransmissions do not take
place.
>
> Then the question comes only about "data" traffic retransmissions. 
> Data traffic can tolerate much higher delays than that of audio or 
> video. Data has only QoS (and no MOS).

It may not have MOS per-se, but unreliable data channels have equivalent
issues - think of a first-person realtime game - unreliable position/state
updates of the user and the world mean that what data is lost (and how much
data is delayed but received) has a very strong impact on the user's
perception of the world.

[RRR] Yes, we need to have NEW threshold of delays (RTT) for data
performance.
--
Randell Jesup
randell-ietf@jesup.org




Classification: UNCLASSIFIED
Caveats: NONE

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