Re: [xrblock] Fw: I-D Action: draft-ietf-xrblock-rtcp-xr-jb-02.txt

[Qin Wu <[e-mail]>]

Hi,Kevin:
I like to make some additioal clarification to your question.
I think the packet arrives exactly on time, is also referred to the packet that has nominal delay.
So we have two ways to address this. 
a. It is more like implementation specific issue,e.g., rely on timing information in the headers of previous 
packet and current packet or rely on time window to determine this. So we can leave this to the specific
 implemenations. 

b. we can explain the packet that arrives exactly on time as the packet that has nominal delay.
The nominal delay can either be choosen as the jitter buffer delay for the packet with minimal delay(i.e., 
the reference packet is choosen as the packet with minmal delay) or average delay for all the packets that arrives
within the implementation specific time window during the measurement interval.
I am not sure we should details to talk about this, but If we take (b), we prefer to add the following sentence in the draft to say:
"Note that the reference packet is generally selected as the packet
 with minimum delay based on the most common criterion (see Sections 1 and 5.1 of [RFC5481]).
"
Let me know what you think about this.

Regards!
-Qin
  ----- Original Message ----- 
  From: Qin Wu 
  To: Kevin Gross 
  Cc: xrblock 
  Sent: Monday, January 14, 2013 8:46 AM
  Subject: Re: [xrblock] Fw: I-D Action: draft-ietf-xrblock-rtcp-xr-jb-02.txt


  Kevin:
  As I clarified to you in the previous email, "implemention specific time window" described in Burst Gap drafts will be used to identify a "packet that arrives exactly on time".
  That is to say, if the receiving packet falls within  implemention specific time window and can be sucessfully playout, such packet will be regarded as packet that arrives exactly on time.
  Hope this clarifies.

  Regards!
  -Qin
    ----- Original Message ----- 
    From: Kevin Gross 
    To: Qin Wu 
    Cc: xrblock 
    Sent: Sunday, January 13, 2013 6:04 AM
    Subject: Re: offlist//Re: [xrblock] Fw: I-D Action: draft-ietf-xrblock-rtcp-xr-jb-02.txt


    Qin, 


    Of the jitter buffer delay metric, the draft currently says "It is calculated based on the difference between the receipt time and the playout time for the packet that arrives exactly on time."


    My issue is that I don't know how to identify a "packet that arrives exactly on time".


    Kevin Gross

    [phone]
    Media Network Consultant

    AVA Networks - www.AVAnw.com, www.X192.org




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