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HUAWEI TECHNOLOGIES Co., Ltd.
www.huawei.com
HUAWEI Confdential
Security Level: confdential
CSFB: Circuit Switched FallBack
Made by: MARRAHA Mehdi
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
ummary
Phase I: C FB
1. Definition
2. Mechanisms
3. IBs
4. Procedures (ased on IBs!
Phase II: "#$%&
1. Im'ementat ion
2. )"CC *et+o r, -rchitecture
3. )"CC Procedure
a!e "
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
Definition
a!e #
Requires changes in the MSC with the introduction
of SGs interface
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
Mechanisms
a!e $
CS%&'ec(ani)
')
%la)( CS%& *edirection
&a)ed on te ca+ailitie) o- Ue) and netor/), t(e
-olloin!'ec(ani)') are availale -or ana eN& to +er-or' CS
%allac/ to
UT*AN0GE*AN.
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
IBs (System Information B(oc,s!
hy IBs are needed/
0o+ many ty'es of IBs are there/
#n +hich channes IBs are transmitted/
hat are the cenarios +here & acuire IBs/
a!e 1
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential a!e 2
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Procedures (ased on IBs!
a!e 3
+rocedure)4a)ed on
SI&)5
&a)ic*edirection
it( SI&)/i++in!
En(anced4SI
tunnelin!5
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Callreliaility
+oor in ca)eo- %la)(CS%&
etter inca)e o-*edirection
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
Phase II: "#$%&
"oice oer IP can e im'(emented in t+o +ays:
a!e 7
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
)"CC *et+or, -rch itecture
a!e 89
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential a!e 88
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential
S)"CC Procedure
%+o ste' 'rocess of S)"CC from $%& to 24534
a!e 8"
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential a!e 8#
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential a!e 8$
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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confdential a!e 81
