GSM procedure

DEAR ,ALL

REALLY I APPRCIATE YOUR SUPPORT ,

I NEED TO UNDERSTAND THE GSM CALL PROCESDURE OUR VENDOR USE COMPLEX DESCRIBTION FOR THE PERFORAMNCE SYSTEM SO . IT IS DIFFECULT TO UNDERSTAND IT ,

COULD YOU HELP US TO DEAL WITH THESE COUNTERS.

SDCCH Dropped call total number 25
SDCCH attemption total number 18151
SDCCH overflow total number 0
SDCCH allocate failure number in busy time 1
Number of SDCCH seizure attempts for assignment 18151
Number of SDCCH seizure success for assignment 18151
Number of SDCCH seizure failure for assignment 0
Number of SDCCH seizure attempts for handover 0
Number of SDCCH seizure failure for handover 0
Number of SDCCH allocation success for assignment 18149
Number of SDCCH allocation failure for assignment 1
Number of SAPI3 link establishment requests on SDCCH (MO-SM) 458
Number of SAPI3 link establishment requests on SDCCH (MT-SM) 890
Number of SDCCH drops due to handover failure 0
Number of SDCCH drops 25
Number of SDCCH assignment attempts 18149
Number of SDCCH assignments success 17745
Number of SDCCH assignment failure 404
Number of SDCCH drops due to loss of contact with RANA 0
Number of SDCCH drops due to radio link failure 25
Number of SDCCH drops due to LAPD link failure 0
Number of SDCCH drops due to OMC-R forced release 0
Number of SDCCH drops due to forced release by other calls 0
Number of SDCCH drops due to handover failure 0
Number of SDCCH drops due to other failure 443
Number of SDCCH drops 25
Number of SDCCH link failures 0
Number of RANA link releases due to other cause on SDCCH 0
Number of SDCCH short messages drops 4
Average number of idle SDCCHs with interference band 0 0
Average number of idle SDCCHs with interference band 1 22.8542
Average number of idle SDCCHs with interference band 2 0.0104
Average number of idle SDCCHs with interference band 3 0
Average number of idle SDCCHs with interference band 4 0.0208
Average number of idle SDCCHs with interference band 5 0.0104
Number of SDCCH seizure attempts for assignment 18151
Number of SDCCH seizure success for assignment 18151
Number of SDCCH seizure failure for assignment 0
Number of SDCCH seizure attempts for handover 0
Number of SDCCH seizure success for Handover 0
Number of SDCCH seizure failure for handover 0
Number of SDCCH allocation attempts for Assignment 18150
Number of SDCCH allocation success for assignment 18149
Number of SDCCH allocation failure for assignment 1
Number of SDCCH allocation attempts for handover 0
Number of SDCCH allocation success for handover 0
Number of SDCCH allocation failure for handover 0
Number of SDCCH assignment attempts 18149
Number of SDCCH assignment success 17745
Number of SDCCH assignment failure 404
Number of SDCCH handover failure 0
Number of SDCCH handover success 0

what does mean seized , allocated assignmet ???????????????????????????????????????????