Anritsu MT8820C - CS Fallback to Gsm;Redirection to GSM

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CS Fallback to GSM/Redirection to GSM 6.1.3.
This chapter describes an example where the LTE Cell executes CS fallback to GSM CCH Channel 1.
1. Execute STDSEL GSM to change the system to GSM.
2. Execute PRESET to perform GSM initialization processing.
3. Execute SYSCMB DCS1800 to set Call Processing Parameter - System Combination to DCS1800.
4. Execute CTRLCH 1 to set Call Processing Parameter - CCH Channel to 1.
5. Execute CHAN 1 to set Call Processing Parameter - TCH Channel to 1.
6. Execute STDSEL LTE to change the system to LTE.
7. Execute PRESET to perform LTE initialization processing.
8. Execute IRAT CSFB_GSM to set the destination at CS Fallback execution to GSM.
9. Execute IRATG_BI DCS1800 to set Call Processing Parameter - Inter-RAT Mobility - GSM - Band Indicator to
DCS1800.
10. Execute IRATG_CH 1 to set the same values as the above GSM Channels settings.
11. Execute IRAT_STDCNG ON to set automatic switching when CS Fallback is executed to change Standard.
12. Perform the LTE connection. (2.1.2, 2.1.3, 2.1.4)
13. Execute CSFB to set CS Fallback to GSM.
14. Execute CALLSTAT? to query the call processing status is 6 (= Termination).
(If not 6 (= Termination), repeat step 14.)
15. The UE responds to the Network call origination.
For Redirection, the changes to the above procedure are shown below.
8. Execute IRAT REDIRECT_GSM to set the destination when Redirection is executed to GSM.
14. Execute CALLSTAT? to query the call processing status is 1 (= Idle (Regist)).
(If not 1 (= Idle (Regist)), repeat step 14.)
NOTE:
 To perform CS Fallback/Redirection to GSM at 1 Port, version 22.18 or later of the GSM software is
required.