Re: SAR

RE: SAR
Hi Damir,

According to the SAR specification, it says the Acknowledgement is sent when the GTR is ON. When the TTR is ON, it doesn't send an Ack, instead the Result_Response is sent. But if there're missing packets, a Nack is sent even if it's a TTR packet.

I'm not sure if that has a bug like that (delay to send Ack). I'll check.

Denzel



  ----- Original Message ----- 
  From: Damir Salantic 
  To: 'kannel-mailing-list' 
  Cc: 'Igor Ivoilov' ; [email protected] 
  Sent: Monday, December 09, 2002 4:38 AM
  Subject: RE: SAR


  Hi to all

  I need an opinion of anyone familiar with WTP and SAR handling.
  Here is the excerption from WTP specs. (WAP-224-WTP-20010710-a.pdf) :
  " The missing packets are re-transmitted with the original Packet Sequence Numbers. When the sender has re-transmitted the requested packets, it reverts to wait for the original acknowledgement (for the GTR or TTR packet). When the receiver has received all packets it acknowledges the GTR or TTR packet according to the normal procedure,using the Ack PDU. ".

  It seems to me that recevier (WAP gateway) must acknowledge resent packets even if they don't have GTR/TTR set. Or maybe sender must set GTR on last resent packet of a group?

  Denzel, 
  seems that your version of SAR patch acknowledges resent packets not imediatelly, but after 4-5 seconds. Is that an expected behaviour?

  Thanks for you answers

  Best regards
  Damir Salantic