SDCCH Drop due TCH Congestion in NOKIA This topic has 5 replies, 1 voice, and was last updated 12 years, 2 months ago by piongly. Viewing 6 posts - 1 through 6 (of 6 total) Author Posts 24th September 2011 at 17:06 #67273 timroyGuest Hello all, In NSN or other vendors as well, TCH Cong/block can cause SDCCH Drop? or SDCCH will be released as normal. What about Queuing & Directed retry? SDCCH drop can be decreased by these features if TCH COng cause SDCCH drop? Thanks/Regards 24th September 2011 at 19:02 #67274 AlonewolvesGuest Hello, There will be SD drop in case of TCH congestion. here is the formula you can calculate SD drop Without TCH congesiton : =(SDCCH_RADIO_FAIL+SDCCH_RF_OLD_HO+SDDCH_LAPD_FAIL+SDCCH_BTS_FAIL+SDCCH_USER_ACT+SDCCH_BCSU_RESET+SDCCH_NETWORK_ACT+SDCCH_ABIS_FAIL_CALL+SDCCH_ABIS_FAIL_CALL_OLD+SDCCH_A_IF_FAIL_OLD) / (SDCCH_HO_SEIZ+SDCCH_ASSIGN) 25th September 2011 at 10:47 #67275 timroyGuest thx Alonewolves, Its sdr_4 formula in netact i guess and no other formula with ”due to tch cong”.. whats the counter of SDCCH drop due to TCH cong? Because I thought that if the call in SDCCH phase and no free TCH channel, it will be released but which counter will work? SDCCH_Radio_Fail or Abis?? or nothing? just release 30th September 2011 at 16:29 #67276 no nokiaGuest nobody from NSN ? 5th October 2011 at 14:15 #67277 saurabh srivastavaGuest Add trx & shift the traffic on other site & check the no. of given sdcch o site 5th October 2011 at 19:58 #67278 pionglyGuest I don’t think your approach is correct If no tch are free this will cause tch block, but all the procedure on sd channell is all done, so the sd will be simply released Sd drop is related to incapacity to complete the tch request channel , on sd channel. if the tch is not available this is not a sd problem regards Author Posts Viewing 6 posts - 1 through 6 (of 6 total) The forum ‘Telecom Design’ is closed to new topics and replies.