This page describes gsm standalone dedicated control channel(sdcch). There is list of some possibilities that has to be taken care while analysing the sdcch drop: 31 hardware fault at bts for bts, hw fault should be the prime and . Introduction:- the signalling transported on the sdcch channel is aimed at reaching the service requested by the mobile station in some cases this represents only the setup of the service, in other cases the service is completely performed on the sdcch channel. What is the reason of sdcch drop if it is others, you can change confact from 4 to 2 if it is bad quality, you need to do as earlier advised ie check which trx has good quality and the keep max sdcch on it.
Measurement point of sdcch call drop when the clear_req and err_ind messages are sent to the msc, and the channel currently seized is the sdcch. This technical report has been produced by the 3 rd generation kpis such as hand-off success rate, call drop-rate, hold sdcch stand-alone dedicated control . What's the cause for sdcch drop and block and what is the difference how the stats are being pegged for this cause i am not able to define it clearly most often i m faced with this type of questions in interviews.
Hi all, i'm facing a big problem, i have a big number of sdcch drop per cell in my area which decrease cssr (nokia product) please advise. Experiences on use: 1) high sdcch drop rates usually result from ghost accesses a bts decodes them from environmental or background noise and filters out most of . Definition : when ms is already on sdcch and in-between communication with base station sdcch channel got disconnected abruptly then sdcch drop has occurred. Cssr abd sdcch drops updated uploaded by the success rate during the sdcch signalling related to a call and the drop call rate . Sdcch drop, sdcch traffic and sdcch duraiton increased as well as imsi detach rate i thought maybe there's other equipment than jammer such as, let's say, anti .
Dropped call(tch drop-sdcch drop) 1 radio link time-out every time a sacch message can not be decoded the radio link time-out counter is decreased by 1 if the . Knowledge sharing sessionsoverviewused toolstechnical procedure sdcch drop rateflow chartexemples. If the drop call is due to low signal strength uplink, check the receive path of this particular trx check receiver sensitivity, vswr, feeder connection and etc (ref:amit dutta & vikas gupta). Step to check tch drop analysis 1 radio link time-out every time a sacch message can not be decoded the radio link time-out counter is decreased by 1.
See more of telecom gujarat forum on facebook kpi’s to be monitored sd blocking sd drop tch blocking tch assignment tch drop hosr get service get sdcch . Post on 24-mar-2015 776 views category: documents 6 download report. Gsm bss optimization manual we use your linkedin profile and activity data to personalize ads and to show you more relevant ads.
Sdcch drop and sdcch mean holding time occur after sdcch is accessed and established 5 degradation of sdcch access success when some rachs, spurious emissions. Sdcch drop rate tch assignment success rate tch assignment failure is a phenomenon where the ms is not able to use the tch which is assigned to it for voice callthis could happen due to uplink . 02 gsm bss network kpi (sdcch call drop rate) optimization manual - free download as word doc (doc), pdf file (pdf), text file (txt) or read online for free. Connection establishment (accessibility) : sdcch/ paging chanel congestion , call set-up success rate (within licensee's own network) , tch congestion connection maintenance (retainability) : call drop rate , worst affected cells having more than 3% tch drop , connection with good voice quality.
- Sdcch congestion is defined as the probability of failure of accessing a stand-alone dedicated control channel during call set up call drop rate ( cdr).
- Hi caki, i am familiar with this issue in nokia system for more than 5 years sdcch drop rate near to 1-15% is usual in nsn i worked in 2 operators of my country that is using nsn bss and the average value of sdcch drop rate is 15% both operators.
- Gsm radio frequency optimization sdcch drop rate this section is empty you can help by adding to it (march 2017) tch assignment success rate.
Channel re-dimension-----change sdcch and pdtch to today sharing is enough for optimization tips about vqi and drop call rate improvement in 2g huawei network . We have found a significant improvement in kpi's, tch drop and sdcch drop which out perform the previous frequency plan tch drop in nbh period is improved by 15 %, sdcch drop in nbh (national busy hour) period is improved by 6 %. Rf optimisation remains one of the key challenges in any network sdcch drop,hoissues, call drop problems, and call set up issues analysis.