Subflow Blocking Method to Improve Performance of MPTCP in High-Speed Train Environments

초록

MPTCP uses multiple interfaces simultaneously in one device, and it improves the total throughput compared to single TCP. The total data throughput is similarly improved compared to single TCP when MPTCP is applied to the high-speed train environment, but Out-of-Order packets occur more frequently than stationary environment because of LTE signal strength reduction and handover. Therefore, HoL Blocking problems in the MPTCP receive buffer occur frequently, and a phenomenon that temporarily decreases performance compared to a single TCP has been resulted. To solve this problem, we propose an method to improve the total data throughput of MPTCP by temporarily blocking the corresponding subflow during a handover. The proposed subflow blocking method has the disadvantage that it can be applied only in an uplink environment, but it mitigates the performance decrease during handover in NS-3 uplink simulation experiment and the total data throughput increased by up to 10% compared to the regular MPTCP, and Out-of-Order packets decreased by about 10%. © 2022, Korean Institute of Communications and Information Sciences. All rights reserved.

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