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Multipath data transmission method

A data transmission method and multi-path technology, applied in the field of mobile wireless communication, can solve the problems of lower transmission rate, data packet loss, link interruption, etc.

Active Publication Date: 2018-02-09
BEIJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the mobility of nodes, the network topology is highly changed, which will cause the link to be interrupted, so that the data cannot be transmitted and cause data packet loss; in addition, due to the limitation of network bandwidth, network congestion will also cause data packet loss; and wireless Data distortion caused by noise and other problems at the bottom layer of the link will also cause data packet loss and reduce the transmission rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0116] This embodiment provides a method for evaluating path quality based on a queuing theory model. A queuing theory model is established for each sub-path in the multi-path transmission protocol. The process of data waiting to be sent in the sending buffer can be simulated as a queuing process, where the rate at which data arrives in the buffer is determined by the sender; the process of data being transmitted through the network and successfully received is simulated as a service process, and the service time is RTT . In the process of data being served, the bandwidth is considered to be stable as the bandwidth measured by TCPWestwood, the data arrival rate conforms to the Poisson distribution, and the service time obeys the general random distribution. Therefore, each subpath can be modeled as M / G / 1. The data transfer rate, that is, the service rate is:

[0117]

[0118] Among them, cwnd i,k Indicates the size of the congestion window evaluated for the kth time on ...

Embodiment 2

[0123] This embodiment provides a method for evaluating path congestion based on measuring available bandwidth. The method flow includes:

[0124] First, measure the available bandwidth in the wireless network by adopting the TCP-Westwood method for measuring the available bandwidth. The available bandwidth is the amount of data transmitted by the network per unit time, that is, the actual transmission rate. Due to the instability of the wireless network bandwidth, the measurement results need to be smooth. The specific method is:

[0125]

[0126]

[0127] Among them, BW i,k is the measurement bandwidth of the k-th ACK reception time on path i measured by TCP-Westwood, BW′ i,k is the measurement bandwidth of the k-th ACK reception time on path i after smoothing, Δt i,k Indicates the time difference between two ACK reception times, D i,k Indicates the amount of data received during this period. Among them, α k is the smoothing factor, and its calculation formula is...

Embodiment 3

[0135] This embodiment provides a reliability option method for detecting path reliability and transferring data. The method includes:

[0136] By designing the path reliability option as a probe and sending it to the receiver, if the receiver can receive and give feedback to the sender, it proves that the path is available; if the sender fails to receive the feedback within the time limit, it proves that the path has been interrupted. At this time, set the congestion window of the path to 0 to enter the dormant state, and transfer the data on this path to other reliable paths for transmission to maintain stable data transmission; while the data is being transferred, the reliability option is still on Continuous transmission on the interrupted path is used to detect the reliability of the path. Once the path is available, the congestion window is set to 1, and it grows according to the AIMD mechanism to provide a transmission channel for data. It is worth noting that this opti...

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Abstract

The invention provides a multipath data transmission method comprising the steps that a queuing theory model is established for each path, the path quality of each sub-path is assessed and the data are dynamically allocated to all the paths to be transmitted according to the path quality; and the link utilization rate of the path is acquired, and packet loss distinguishing is performed according to the relationship between the link utilization rate and the preset link congestion reference threshold. Streaming media data transmission is performed by the method so that the transmission rate canbe obviously enhanced, the transmission delay can be greatly reduced and the user experience can be greatly enhanced.

Description

technical field [0001] The present invention relates to the technical field of mobile wireless communication, and more specifically, relates to a multi-path data transmission method. Background technique [0002] With the development of mobile wireless communication technology, vehicle ad hoc networks (VANETs) develop rapidly. Vehicle ad hoc network is a special form of mobile ad hoc network (MANETs), which has the characteristics of node movement and dynamic change of network topology without pre-deployment. However, due to the limitation of actual roads, the nodes in the vehicle ad hoc network cannot move freely like the nodes in the mobile ad hoc network. In the self-organizing network of the Internet of Vehicles, the vehicle nodes are equipped with large-capacity storage space and super computing power, and support various types of applications, including security inspection, traffic congestion control management, etc. In addition, IEEE has standardized 802.11p as an e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W24/04H04W28/02H04W28/10H04W84/18H04L1/18
CPCH04L1/18H04W24/04H04W28/021H04W28/0236H04W28/0242H04W28/0284H04W28/0289H04W28/10H04W84/18
Inventor 许长桥朱丹阳关建峰刘杨王熙凤周赞
Owner BEIJING UNIV OF POSTS & TELECOMM
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