GSM呼叫流程动画
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channel
request
channel
request
•establishment cause
answer for paging (MTC)
emergency call
call re-establishment
user request (MOC, SMS, suppl.service)
other serives (loc. update, IMSI detach)•random number
channel
required
channel
request channel
required
•BSC starts searching for a SDCCH channel -channel available -> reservation
-no channel available -> blocking
channel
request channel
required SDCCH seiz att. SDCCH busy att. Ghost CCCH Res.
•BSC starts searching for a SDCCH channel -channel available -> reservation
-no channel available -> blocking
channel
request channel
required SDCCH seiz att. SDCCH busy att. Ghost CCCH Res.
channel activation
channel
request channel
required SDCCH seiz att. SDCCH busy att. Ghost CCCH Res.
channel activation channel act. ackn.
channel
request channel
required SDCCH seiz att. SDCCH busy att. Ghost CCCH Res.
channel activation channel act. ackn. immediate assignment
channel
request channel
required SDCCH seiz att. SDCCH busy att. Ghost CCCH Res.
channel
activation
channel
act. ackn.
immediate
assignment
•information included
page mode
timing advance
channel description
timeslot
subchannel
training sequence code
RF channel number
•timer 3101 started in the BSC
channel
request channel
required SDCCH seiz att. SDCCH busy att. Ghost CCCH Res.
channel
activation
channel
act. ackn.
immediate
assignment
SDCCH assign.
•information included
page mode
timing advance
channel description
timeslot
subchannel
training sequence code
RF channel number
•timer 3101 started in the BSC
channel
request channel
required SDCCH seiz att. SDCCH busy att. Ghost CCCH Res.
channel
activation
channel
act. ackn.
immediate
assignment SDCCH assign. immediate
assignment
channel
request channel
required SDCCH seiz att. SDCCH busy att. Ghost CCCH Res.
channel
activation
channel
act. ackn.
immediate
assignment SDCCH assign. immediate
assignment
ESTABLISHMENT PART
channel
request channel
required SDCCH seiz att. SDCCH busy att. Ghost CCCH Res.
channel
activation
channel
act. ackn.
immediate
assignment SDCCH assign. immediate
assignment
CM service
request