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Multipath parallel transmission method facing satellite network

A transmission method and satellite network technology, which is applied in transmission systems, digital transmission systems, network traffic/resource management, etc., can solve the problem that the CMT protocol cannot adapt to long-delay satellite networks, etc., to reduce the excessive growth of windows and improve throughput volume effect

Inactive Publication Date: 2012-07-04
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0004] To sum up, the traditional CMT protocol based on the ground network cannot adapt to the satellite network environment with long delay and high bit error, and an improved CMT protocol is needed to alleviate the buffer blocking problem at the receiving end caused by the difference of different link characteristics. , while adaptively distinguishing between congestion and bit errors according to network conditions, realizing efficient use of links

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  • Multipath parallel transmission method facing satellite network
  • Multipath parallel transmission method facing satellite network
  • Multipath parallel transmission method facing satellite network

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Embodiment Construction

[0058] The problem that the present invention proposes to solve the multi-path parallel transmission encountered in the satellite network is divided into the following steps:

[0059] Step 1: Through the four-way handshake mechanism, the SCTP hosts at both ends exchange communication status, and the peer-to-peer endpoints establish a coupling through multiple satellite links.

[0060] Step 2. Before sending data, record the sending timestamp in the header field of the packet At the same time, a short byte is set to store the path identifier path identifier field. The initial value is -1, indicating that the optimal path of the SACK block fed back by the receiving end has not been calculated temporarily, and the data packet is sent. Set the path status to false, indicating that the buffer capacity of the receiving end is not estimated.

[0061] Step 3: After each destination port of the receiving end receives three packets with relatively consecutive TSN numbers, the congesti...

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Abstract

The invention relates to a multipath parallel transmission method facing a satellite network, which is a control method for carrying out data transmission in a satellite network transmission layer. By combining the satellite network with the multipath transmission characteristics, the multipath parallel transmission method facing the satellite network has the following improvements that on the basis of relieving the cache congestion of a receiving end, a loss differentiation method on the basis of delay jitter is adopted; the receiving end transmits a congestion mark to a source end through a confirmation packet; the source end correspondingly regulates congestion windows and regulates the sending rate by combining the congestion mark with a data block retransmission mark; simultaneously, the source end compares time delays of data packets fed back by all target nodes and uses one path with the shortest time delay as the optimal path of a feedback packet; and the source end is beneficial for more rapidly regulating the congestion windows, reducing the network performance deterioration caused by excessively higher increase rate of the windows, timely retransmitting lost data blocks and improving the performances of the multipath parallel transmission in the satellite network on the aspects of throughput, window jitter, time delay, packet loss and the like.

Description

technical field [0001] The invention is a performance solution for transport layer protocol in satellite network. The method is mainly used to improve the performance of a multipath parallel transfer protocol (Concurrent Multipath Transfer, referred to as CMT) in a satellite network, and belongs to the technical field of congestion control of a satellite network transmission layer. Background technique [0002] With the maturity of network interface technology and the gradual heterogeneity of the Internet, many mobile devices have the characteristics of multiple interfaces, but the currently commonly used TCP / IP protocol and Stream Control Transmission Protocol (SCTP) can only use a single interface to transmit data, and cannot Effective use of bandwidth resources, but parallel multi-path transmission (CMT) solves this problem well. CMT is built on the basis of SCTP and inherits the multi-homing and multi-flow properties of SCTP. It is similar to the mTCP currently studied....

Claims

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Application Information

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IPC IPC(8): H04L1/00H04W28/02
Inventor 孙力娟蔡冬肖甫叶晓国王汝传郭剑
Owner NANJING UNIV OF POSTS & TELECOMM
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