Method for reducing influence of data packet disorder on SCTP multipath transmission

Abstract

The invention discloses a method for reducing an influence of data packet disorder on stream control transmission protocol (SCTP) multipath transmission. The method comprises the following steps of: (1) acquiring metric values of paths according to the path bandwidth, the delay and the packet loss ratio, measured in real time, of each independent path; and performing path scheduling and data packet distribution according to the metric values; and (2) judging a path which loses a data packet by using a transmitting terminal through an SACK block transmitted by a receiving terminal and carryingout end-to-end path-based data packet rapid transmission. The method can effectively reduce the influence of the data packet disorder on the SCTP multipath transmission, and can improve the performance of SCTP-based end-to-end multipath.

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to a method for reducing the influence of out-of-sequence of SCTP multipath transmission data packets. Background technique [0002] With the development of network technology, on the one hand, network access technologies continue to diversify, including WAN, LAN and personal area network access technologies. Wired and wireless access technologies are becoming more mature and commercially available, such as xDSL, xPON, 3G, WLAN, WiMAX, Bluetooth, etc.; on the other hand, the cost of access equipment continues to decrease, and more and more terminals are equipped with multiple network adapters. For example, mobile terminal laptops are usually equipped with LAN interfaces and WLAN interfaces, and can also support 3G wireless access ; While general PDA supports WLAN and 3G access; some fixed terminals also support LAN and WLAN access. Therefore, multi-home terminals and ...

AI Technical Summary

Problems solved by technology

[0004] However, since TCP and UDP can only use one end-to-end path, they cannot make full use of the advantages of end-to-end multipath; although SCTP supports multiple paths to transmit data, only one of them is used as the main transmission path, and the others are used as important transmission paths. transmission path, its characteristics cannot fully meet the requirements of end-to-end multipath

After SCTP is extended, the standard SCTP can support multiple paths to transmit data in parallel, but the disorder of data packets caused by the difference in bandwidth and delay of different paths will cause the performance of SCTP multipath to drop sharply, and even fail to use any single path. time performance

SCTP's fast retransmission is based on an end-to-end single path. In this context, disorder is difficult to occur. Therefore, fast retransmission is a quick response to packet loss. Under the condition of end-to-end multipath, due to path differences, disorder Sequence is easy to occur, and SCTP misinterprets it as packet loss, which causes the congestion window to decrease, resulting in performance degradation

Therefore, on the one hand, the use of end-to-end multipath causes a large number of out-of-order data packets to reach the receiving end; on the other hand, SCTP's own mechanism is insufficient in dealing with out-of-order problems, and needs to be improved

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