Introduction
Network-based mobility management enables the same functionality as Mobile IP, without any modifications to the host's TCP/IP Protocol stack. With PMIP the host can change its point-of-attachment to the Internet without changing its IP address. Contrary to Mobile IP approach, this functionality is implemented by the network, which is responsible for tracking the movements of the host and initiating the required mobility signalling on its behalf. However in case the mobility involves different network interfaces, the host needs modifications similar to Mobile IP in order to maintain the same IP address across different interfaces.
The "SaMOG" (S2a Mobility) study item in 3GPP defines the interworking between mobile packet core and a trusted WLAN access network. The interface that SaMOG defines for this interworking is 3GPP S2a PMIP and GTP interfaces.
Read more about this topic: Proxy Mobile IPv6
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