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Mastering 5G Network Design, Implementation, and Operations
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One of the prime features of the 5G core network is its capability to inter-work with different types of access networks, both 3GPP-based and non-3GPP-based. One such network is Wi-Fi. The 5G radio can coexist with Wi-Fi access to cover coverage gaps. Hence, denser access can be planned with complementing radio access technologies. This is how Wi-Fi and New Radio (5G radio) can complement each other and do not need to be treated as competing technologies.
Figure 7.29 – Wi-Fi attach – part 1
We will now go over the Wi-Fi attach procedure:
Step 1: The UE sends the IKE_SA_AUTH
exchange message to ePDG (IWF-interworking function) to create the IPSec tunnel.
Step 2: The UE sends the IKE_SA_AUTH
exchange message to the SMF+PGW-C as a GTP Create Session
request by including the P-CSCF IPv4 or IPv6 request and DNS IPv4 or IPv6 container identifier in APCO IE options. The ePDG checks the UE capability information to determine whether...
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