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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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