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1                                                Core network aspects


            9.1.2   Path selection mechanism initiated by the network proxy entity

            Suppose that UE_A is unaware of multi-path transmission and accesses only the WLAN access network, in
            contrast to clause 9.1.1, and the FTP server (MUE_B) is an MPT-enhanced MUE. When UE_A initiates an FTP
            service to MPT-enhanced MUE_B, the MPT proxy of UE_A decides whether to initiate the MPT connection
            for UE_A based on the MPT support situation of corresponding node and network performance.
            The detailed information flow of this example scenario is shown in Figure 9-2.




































                               Figure 9-2 – Path selection procedure in network-based scenario

            1-2)    UE_A launches an FTP service request to an FTP server (MPT-enhanced MUE_B). MPT-enhanced SCF
                    intercepts  the  service  request  and  sends  an  MPT  request  to  MPT-enhanced  MPC-FE  to  decide
                    whether to act as a proxy for UE_A;
            3)      after receiving the MPT request, MPT-enhanced MPC-FE obtains the profile information of the FTP
                    server from MUP-FE and judges whether the FTP server, MUE_B, is MPT-enhanced. In this scenario,
                    MUE_B is MPT-enhanced;
            4-5)    MPT-enhanced MPC-FE makes MPT policy decisions based on the overall network performance and
                    the service requirements., It then forwards the policy to the MPT-enhanced SCF. During the process
                    of  data  packets  transmissions,  MPT-enhanced  MPC-FE  pushes  the  parameters  for  network
                    performance to the MPT-enhanced SCF periodically;
            6)      the MPT-enhanced SCF makes the MPT proxy decision to decide to act as an MPT proxy for the
                    sending end;
            7)      MPT-enhanced  SCF  establishes  two  transmission  paths  with  MPT-enhanced  MUE_B  instead  of
                    UE_A;

            8)      when the process of multi-path establishment has finished, MPT-enhanced SCF sends a service
                    initial respond message to inform UE_A to communicate with MPT-enhanced MUE_B.

            For  UE_A,  the  multi-path  transmission  between  MPT-enhanced  SCF  and  MPT-enhanced  MUE_B  is
            transparent, but UE_A can enjoy the benefit of multi-path transmission control.








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