- This topic has 11 replies, 1 voice, and was last updated 11 years, 7 months ago by Pix.
17th February 2009 at 19:11 #55843omcrGuest
I increased CDED & CDEF on a site and my throughput has gone up a little as expected. I also noticed gprs_ter_upgrd_req counter has dropped off from an average of 1100 requests daily to 300. Is this to be expected? Is this all due to the increase in CDED and is this all good?17th February 2009 at 21:54 #55844PixGuest
What is definition of CDED?
Perhaps I can relate to our parameters.18th February 2009 at 14:50 #55845omcrGuest
CDED is number of tch channels dedicated to data18th February 2009 at 14:53 #55846omcrGuest
CDED is actually a percentage of avalable channels dedicated to data18th February 2009 at 14:56 #55847PixGuest
the gprs_ter_upgrd_req counter has decreased probably because less MS are needing additional PDCH : they are already fully served.
If there is not enough PDCH in the cell (= if CDED is too small) then the MS will keep trying to get more PDCH, therefore more gprs_ter_upgrd_req are counted.19th February 2009 at 20:02 #55848omcrGuest
So this appears to be a normal result and should not be a concern as long as the site is carrying the same (or larger)volume of data traffic as it did prior to my changes, correct? Does the reduced number of requests help the site performance in any other way not related to data, possibly reduce SDCCH signaling?.20th February 2009 at 07:24 #55849PixGuest
No, it just increases the qos offered to the subscriber. SDCCH are never used during a GPRS data call.
Perhaps it unloads the GPU as well?26th March 2009 at 09:40 #55850FarkhatGuest
Increasing CDED, which is % from total BTS TCH resource, you reserve PCU resource and radio resource as well. That’s critical for high loaded cells as dedicated TCH can not be used for speech. Increasing CDEF you reserve resource only in PCU and territory upgrade become possible only if radio resource is available. What is the priority, voice or data?26th March 2009 at 20:07 #55851PixGuest
Operators give more priority to voice : it brings more money than data.27th March 2009 at 03:39 #55852FarkhatGuest
Of course Pix! That’s why CDEF is better parameter to play with27th March 2009 at 06:01 #55853sun cellGuest
hi pix give me an idea why is it that their is unused time slot in dtru even if it is full config.27th March 2009 at 18:37 #55854PixGuest
Sorry, i don’t know.