call setup signalling procedure
DESCRIPTION
Call Setup Signalling ProcedureTRANSCRIPT
Call Setup Signalling Call Setup Signalling ProcedureProcedure
MSC BSC ListMSC BSC List
MSS (MSS 4A – BSC_428H_CMU)MSS (MSS 4A – BSC_428H_CMU)
Siemens MSC (MSC 2D – BSC_417H_CTO)Siemens MSC (MSC 2D – BSC_417H_CTO)
Ericsson MSC (MSC 2CN – BSC_404H_LAN)Ericsson MSC (MSC 2CN – BSC_404H_LAN)
Trace call was completed by tracing two subs Trace call was completed by tracing two subs located under the same BSC.located under the same BSC.
1. MSS (MSS 4A - BSC_428H_CMU)1. MSS (MSS 4A - BSC_428H_CMU)
1. MSS (MSS 4A - BSC_428H_CMU)1. MSS (MSS 4A - BSC_428H_CMU)
Call ID 12769: A subCall ID 12769: A sub
Call ID 12487: B subCall ID 12487: B sub
A sub was assigned CIC/TCH after MSC A sub was assigned CIC/TCH after MSC received confirmation from B sub.received confirmation from B sub.
2. 2. Siemens MSC (MSC 2D – Siemens MSC (MSC 2D – BSC_417H_CTO)BSC_417H_CTO)
2. Siemens MSC (MSC 2D – 2. Siemens MSC (MSC 2D – BSC_417H_CTO)BSC_417H_CTO)
2. Siemens MSC (MSC 2D – 2. Siemens MSC (MSC 2D – BSC_417H_CTO)BSC_417H_CTO)
2. Siemens MSC (MSC 2D – 2. Siemens MSC (MSC 2D – BSC_417H_CTO)BSC_417H_CTO)
Call ID 21612: A subCall ID 21612: A sub
Call ID 22006: B subCall ID 22006: B sub
Like MSS 4A situation, A sub was assigned Like MSS 4A situation, A sub was assigned CIC/TCH after MSC received confirmation from CIC/TCH after MSC received confirmation from B sub. B sub.
3. Ericsson MSC (MSC 2CN – 3. Ericsson MSC (MSC 2CN – BSC_404H_LAN)BSC_404H_LAN)
3. Ericsson MSC (MSC 2CN – 3. Ericsson MSC (MSC 2CN – BSC_404H_LAN)BSC_404H_LAN)
3. Ericsson MSC (MSC 2CN – 3. Ericsson MSC (MSC 2CN – BSC_404H_LAN)BSC_404H_LAN)
Call ID 12748: A subCall ID 12748: A sub
Call ID 14007: B subCall ID 14007: B sub
A sub was assigned TCH/CIC before MSC A sub was assigned TCH/CIC before MSC paged B sub.paged B sub.
Working mode of MSS and Siemens MSCWorking mode of MSS and Siemens MSC
BSC (A) MSC BSC (B)
CM_SERV_REQUEST---------------------.....
DT1(SETUP)-------------------------------------->
....... DT1(SETUP)- ------------------------------------------>
DT1(TMSI_REALLOC_CMD)-------------------> <------------------- DT1(TMSI_REALLOC_COMPL)
<--------------------------------DT1 (ASS_REQ) DT1 (ASS_COMPL) --------------------------->
DT1 (ASS_REQ) -------------------------------> <-------------------------------- DT1 (ASS_COMPL)
<-------------------------------- DT1 (ALERTING) <-------------------------------- DT1 (ALERTING) DT1(CONNECT) ----------------------------------> <----------------------- DT1 (CONNECT_ACK)
DT1(CONNECT) ----------------------------------> <----------------------- DT1 (CONNECT_ACK)
< CALL IN TALK >
Working Mode of Ericsson MSCWorking Mode of Ericsson MSC
BSC (A) MSC BSC (B)BSC (A) MSC BSC (B) CM_SERV_REQUEST----------------------->CM_SERV_REQUEST----------------------->.......... DT1(SETUP)-------------------------------------->DT1(SETUP)-------------------------------------->..............<--------------------------------DT1 (ASS_REQ)<--------------------------------DT1 (ASS_REQ)DT1 (ASS_COMPL) --------------------------->DT1 (ASS_COMPL) ---------------------------> ........................ DT1(SETUP)- ------------------------------------------>DT1(SETUP)- ------------------------------------------> DT1(TMSI_REALLOC_CMD)---------------------->DT1(TMSI_REALLOC_CMD)----------------------> <------------------- DT1(TMSI_REALLOC_COMPL)<------------------- DT1(TMSI_REALLOC_COMPL) DT1 (ASS_REQ) ------------------------------>DT1 (ASS_REQ) ------------------------------> <-------------------------------- DT1 (ASS_COMPL)<-------------------------------- DT1 (ASS_COMPL) <-------------------------------- DT1 (ALERTING)<-------------------------------- DT1 (ALERTING)<-------------------------------- DT1 (ALERTING)<-------------------------------- DT1 (ALERTING)DT1(CONNECT) ---------------------------------->DT1(CONNECT) ----------------------------------><----------------------- DT1 (CONNECT_ACK)<----------------------- DT1 (CONNECT_ACK) DT1(CONNECT) DT1(CONNECT)
------------------------------ <----------------------- DT1 ------------------------------ <----------------------- DT1 (CONNECT_ACK)(CONNECT_ACK)
< CALL IN TALK >< CALL IN TALK >
SummarySummary
MSS and Siemens MSC works like the other: MSS and Siemens MSC works like the other: find B sub before assign channel to A sub -find B sub before assign channel to A sub ->CSSR low (BSC_428H_CMU E2E CSSR 93%, >CSSR low (BSC_428H_CMU E2E CSSR 93%, BSC_417H_CTO E2E CSSR 95%).BSC_417H_CTO E2E CSSR 95%).
Ericsson MSC: assign channel to A sub before Ericsson MSC: assign channel to A sub before find B sub -> CSSR high (normally 97%-98%)find B sub -> CSSR high (normally 97%-98%)