Re: [xrblock] Calculation of delay metrics defined in the Delay Block

Re: [xrblock] Calculation of delay metrics defined in the Delay BlockHi, Alan:
I think you explaination is more precise, thank for your clarification and make correction.

Regards!
-Qin
  ----- Original Message ----- 
  From: Alan Clark 
  To: Qin Wu ; zhaojing@sttri.com.cn ; xrblock 
  Sent: Friday, October 28, 2011 7:44 PM
  Subject: Re: [xrblock] Calculation of delay metrics defined in the Delay Block

  Qin

  Strictly speaking, End System Delay is not part of Network Round Trip Delay but is part of the overall round trip delay experienced by the user.

  Network Round Trip Delay in this case should be the round trip delay measured using RTP, which includes the network transmission delay in each direction plus some processing time within the IP/UDP/RTP stack.

  End System Delay is an estimate of the additional round trip delay that the user would experience due to encoding/decoding/ buffering/ accumulation and "may" also include other delay components that are external to the RTP segment, if known. 

  The total round trip delay experienced by the user is the Network Round Trip Delay plus the End System Delay from each end.

  Also - it may be better not to describe the End System Delay in terms of "Sending side" and "Receiving side" as this may be understood to mean the sending and receiving sides of the connection not the endpoint.  

  Best Regards

  Alan

  On 10/28/11 6:10 AM, "Qin Wu" <bill.wu@huawei.com> wrote:

    End System Delay is part of  Network Round trip delay(Transmission Delay is another part of Network Round Trip Delay).
    The End System Delay is calculate based on sending side internal Delay and receiving side internal Delay.
    Sending side internal Delay = Accumulation and Encoding Delay
    Reciving Side Internal Delay = Jitter Buffer Delay + Decoding and Playout Buffer Delay.
    In my understanding, the End System Delay can be measured using DLSR or DLRR. We can choose mean value of DLSR and DLRR to stand
    for the average End System Delay.

    Regards!
    -Qin

      ----- Original Message ----- 

      From:  zhaojing@sttri.com.cn 

      To: xrblock <mailto:xrblock@ietf.org>  

      Sent: Friday, October 28, 2011 4:25 PM

      Subject: Re: [xrblock] Calculation of delay  metrics defined in the Delay Block

      Hi, Qin:

      Would you like to explain to me how End System Delay is  calculated?

      Is it based on DLSR or something else? It looks like a internal  calculation.

      Regards!

      -JingZhao

        a.. From: Qin Wu <bill.wu  at huawei.com <mailto:bill.wu@DOMAIN.HIDDEN> >   
        b.. To: zhaojing at  sttri.com.cn <mailto:zhaojing@DOMAIN.HIDDEN> , xrblock <xrblock  at ietf.org <mailto:xrblock@DOMAIN.HIDDEN> >   
        c.. Date: Thu, 20 Oct 2011 18:34:53 +0800   
        d.. References: <22819783.8901319076443866.JavaMail.root  at ent11 <mailto:22819783.8901319076443866.JavaMail.root@DOMAIN.HIDDEN> >   
        e.. List-id: Metric Blocks for use with RTCP's Extended Report  Framework working group discussion list <xrblock.ietf.org> 

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       Hi,jing:  Please refere to RFC3550. 
       The round trip time computation method is defined as a example in  the figure 2 of RFC3550. 

       Regards! 
       -Qin 

        -----  Original Message ----- 
        From: zhaojing at  sttri.com.cn <mailto:zhaojing%20at%20sttri.com.cn>  
         To: xrblock <mailto:xrblock%20at%20ietf.org>  
         Sent: Thursday, October 20, 2011 10:07 AM 
         Subject: [xrblock] Calculation of delay metrics defined  in the Delay Block 

          Hi, 
         I have read Delay draft avaiable at: 
         http://tools.ietf.org/html/draft-ietf-avt-rtcp-xr-delay-02  

         It is not clear to me how each metric is calculated, For example,  
         it is said Mean Network Round Trip Delay metric is ypically determined  
        using  RTCP SR/RR? 
         I am not  sure I understand the rationale? Who would like to explain a little to  me? 

         Regards! 
         jing  Zhao   ShangHai  Research Institute of China Telecom Corporation Limited.  

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