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[问题讨论] CSFB流程 [复制链接]

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亚星游戏官网-yaxin222  列兵

注册:2011-2-23
发表于 2015-12-16 11:47:09 |显示全部楼层
MO CSFB
↑ Extended Service Request (in RRC Connnet Setup Complete or information Transfer)
↓RRC Connection Release
↑Channel Request (MS-GSM)
↓Immediate Assignment  (  Message in AGCHBSC-MS:分配SDCCH )
↑ CM Service RequestMS-MSC
↑Classmark Change (MS-BSC)
↑GPRS Suspension Request MS-MSC
CM Service Accept (MSC-MS)
↑Setup (MS-MSC called party number)
↓ Identity Request( MSC-MS,IMEISV )
↑Identity Response (MS-MSC,IMEISV of MS)
↓Call Proceeding(MSC-MS)
↓Assignment Command (Message in SDCCHBSC-MS,分配TCH)
↑Assignment Complete (Message in TCH)
↓Alerting(Message in TCH ,MSC-MS) 被叫振铃,
↓ConnectMessage In TCHMSC-MS 被叫接听
↑Connect AcknowledgeMS-MSC)接听确认

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