求一条完整的CSFB起呼到结束的信令流程

大神们：

             求一条完整的TD-LTE的CSFB从起呼到结束的信令流程。

可以参考这个信令流程。

http://www.mscbsc.com/bbs/thread-573025-1-1.html#52

. CS FallBack from EPS to CS domain

2. CSFB reuses voice and other CS-domain services provided by legacy CS infrastructure

3. EPS redirects the UE to CS Domain for CS services

3a. SMS can be delivered to the UE without redirecting to CS Domain

3b. After CS service the UE returns to LTE, depending on coverage and policy

4. User can decide, based on CLI, whether to accept CSFB request

5. Application of CSFB:

5a. CS capable device camping on LTE cell can establish/receive CS services

5b. Reuse of existing CS infrastructure for voice service until IMS VoIP is deployed

5c. Provide voice roaming support with LTE

5d. Support E911 using existing CS infrastructure

5e. Rel-9 IMS provides full emergency call support

5f. Requires overlapping CS domain coverage