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Half-duplex mode-based flow control method and network communication device adopting same

A flow control and network communication technology, applied in data exchange networks, digital transmission systems, electrical components, etc., to solve problems such as channel occupation, the inability of the receiver and transmitter to transmit/receive packets normally, and the reduction of network usage efficiency. Achieve the effect of shortening the back-off time and not occupying the channel for a long time

Inactive Publication Date: 2015-04-22
ALI SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the flow control method disclosed in US No. US6370115 can solve the problem of buffer overflow, the channel will always be occupied during the process of back pressure, resulting in the inability of the receiving end and the transmitting end to transmit / receive packets normally. thereby reducing the efficiency of network usage

Method used

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  • Half-duplex mode-based flow control method and network communication device adopting same
  • Half-duplex mode-based flow control method and network communication device adopting same
  • Half-duplex mode-based flow control method and network communication device adopting same

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Embodiment Construction

[0065]In order to avoid long-term occupancy of the channel during the back pressure process, and avoid long-term retreat caused by excessive collisions. The present invention provides a flow control method and a network communication device using the flow control method to solve the problems of long-term occupancy of channels and excessive collision of the same packet, thereby improving network usage efficiency. The flow control method of the present invention will immediately end the back pressure signal after detecting the collision for a short period of time, so that the receiving end and the transmitting end can perform normal receiving and transmitting functions as soon as possible. In addition, the flow control method of the present invention also sets different back pressure thresholds (thresholds) for the receiving data registers, through different back pressure thresholds and the register unit utilization (or usage number) of the receiving data registers Determine the...

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Abstract

The invention relates to a flow control method, which is adopted by a half-duplex mode-based networking communication device, and comprises the following steps: firstly, judging the congestion pre-warning status of a receiving data register; secondly, determining the sending expectation value of a back pressure signal according to the congestion pre-warning statues, wherein the grade of the congestion pre-warning status and the sending expectation value of the back pressure signal are in direct proportion; and lastly, according to the sending expectation value of the back pressure signal during receiving data, the back pressure signal is sent to generate preset collision frequency.

Description

technical field [0001] The present invention relates to a network communication device, and in particular to a flow control method used in half-duplex mode. Background technique [0002] A communication system in half-duplex mode allows two-way data transmission between two devices, but not simultaneously. Therefore, only one device is allowed to transmit data at the same time. If another device wants to transmit data, it needs to detect that the channel between the two devices is idle before sending data. This is the carrier sense multiple access mechanism (Carrier Sense Multiple Access, CSMA for short) in the IEEE 802.3 standard. However, since information transmission takes time, when any device detects that the channel is idle, there may still be information being transmitted in this channel. At this time, packet collision may occur. This is the collision detection mechanism (Collision Detection, referred to as CD) in the IEEE 802.3 standard. After a collision occurs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/825H04L12/801
Inventor 于冬娥
Owner ALI SHANGHAI
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