Switching process (Wlan->e-utran)

There are a lot of WLAN and Eutran switch types, the main distinction is a variety of interfaces (such as S2A, S2B, S5, S8), as well as various ways (such as PMIPV6, PIMIP) but for the interface, the basic is the same (I am the terminal test, so the basic value of attention to the interface message)

Example: Handover fromtrusted or untrusted non-3gpp IP Access to E-utran with PMIPv6 ons2a or S2B and GTP on S5/S8 interfaces

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Step Description:

1. The terminal is connected to a Wi-Fi network and established a connection

2. Due to certain conditions of the WLAN does not meet the terminal residency, the terminal began to search 3GPP system (detailed procedure can refer to ANDSF)

3. The terminal initiates the attach attachment to the LTE network while initiating the PDN connection that needs to be switched, PDN connection event is handover

4.MME connection with HSS, authentication of terminals, etc.

5. After successful authentication, Mme executes locationupdate and subscriber data Retriveval to obtain user information

6~10mme Select APN, SGW and PGW, resume request

11 terminal and SGW built-in, PMIPV6 and GTP channels on S5 interface

12~15mme to SGW request to modify the hosting (eNB address, ENB Teid and switch instructions sent to SGW)

16. Wireless Bearer resume Chen, the GTP tunnel was established.

17. Terminal initiates PDN connection request

18 releasing the WLAN hosting