access_per_agch (how many im_assign_cmd/rej was sent out, 1 msg may include upto 2 MS) expire T3101 chan_req_ms_fail estabish indiction CM service request stop T3101 ok_acc_proc ms_access_by_type (1510) initial L3 information CM Service request immediate assignment reject conn_req_to_msc alloc_sdcch_fail chan_req_ms_blk classmark3(if needed)
SCCP conn
conn_refused SDCCH
setup identity request (if MSC need more MS information) identity response call proceeding (MSC have got enough information to setup the connection) facility (if MS have some supplementary services, such as call divert)
T310
initiate assignment assignment resource request resouce not available alloc_tch_fail ma_cmd_to_ms_blkd unsuccessful assignment
call setup
assignment request start MSC timer for ma_req_from_msc assignment, =30s maybe efr_req_from_msc start assign_successful expire MSC timer without UDT(reset circuit) assignment complete' or assignment failure' expire assign_successful assignment failure assignment failure
force queue start T11 assignment queued queuing indication expire T11
Only at this time, the MSC begain to send the called address to PSTN
L2 SABM UA assignment completed stop T10 assignment successful stop assign_successful connection required connection response success assignment complete total_call and alloc_tch counter works before alerting signal was sent. For drive test, the drop call should be considered after this point.
