CN102013941A - Random frame spacing control method - Google Patents

Abstract

The invention discloses a random frame spacing control method. The random frame message control method comprises four steps, wherein the operation can be cycled from the second step to the fourth step, with the invention, not only a lower logic can be controlled to stop generating a message, but also the lower logic can be controlled to generate the message. The method effectively solves the problem that each flow is subjected to scheduling transmission in proportion during the simulation of multiple stay situation, at the same time, can achieve high control precision.

Description

A kind of random frame interval control method

Technical field

The present invention relates to a kind of control method in the network communications technology field, particularly relate to a kind of random frame interval control method.

Background technology

In the network test process, for the requirement of testing, need to send message with random interval, require in certain time interval, to have constant speed simultaneously, and the control of message is to need the problem that solves in the analog message process of transmitting at random.

Summary of the invention

The present invention aims to provide that a kind of CPU of employing calculates and the FPGA hardware logic is controlled the mode that combines message is at random controlled at interval, reaches the random frame interval control method of constant rate of speed simultaneously.

The technical scheme of a kind of random frame interval control method of the present invention is as follows:

A kind of random frame interval control method of the present invention may further comprise the steps:

The first step: calculate the frame period G between message, under the situation that does not comprise standard frame interval 12 bytes, computing formula is:

$G=(L+12+8)\×(\frac{R_1}{R}-1),$

Wherein:

The speed of the message that R-need send,

The L-message length,

A byte between the 12-standard frame,

8-lead code byte,

R ₁-port linear velocity, and R ₁＜R;

Second step: be sent completely the message of L byte when transmit control device after, latency counter loading scope from the M sequence generator is the random value m of 0～2G, and m ≠ 0, and begin to carry out the calculating of byte number time corresponding value, it is 0 that output simultaneously sends control request signal Req signal, and control subordinate logic stops message and produces;

The 3rd step: when latency counter counting reaches random value m, and m ≠ 0 o'clock, the notice transmit control device sends next data message, and it is 1 that output sends control request signal Req signal, and control subordinate logic produces message;

The 4th step: carry out the operation of second step.

The beneficial effect of a kind of random frame interval control method of the present invention is: in a kind of random frame interval control method of the present invention, because m is a random value, so sending the time of its wait of control also is random value, thereby sending message also is random value at interval, described control method has solved the problem of dispatching transmission at each stream of simulating the condition of showing mercy in proportion effectively, can reach very high control precision simultaneously.

Description of drawings

Fig. 1 is the control flow chart of a kind of random frame interval control method of the present invention.

Embodiment

When using a kind of random frame interval control method of the present invention, at first, calculate the frame period G between message, do not comprising standard frame at interval under the situation of 12 bytes, computing formula is:

$G=(L+12+8)\×(\frac{R_1}{R}-1),$

Wherein:

The speed of the message that R-need send,

The L-message length,

A byte between the 12-standard frame,

8-lead code byte,

R ₁-port linear velocity, and R ₁＜R;

Referring to accompanying drawing 1, be sent completely the message of L byte when transmit control device after, latency counter loading scope from the M sequence generator is the random value m of 0～2G, and m ≠ 0, and begin to carry out the calculating of byte number time corresponding value, it is 0 that output simultaneously sends control request signal Req signal, and control subordinate logic stops message and produces; When latency counter counting reaches random value m, and m ≠ 0 o'clock, the notice transmit control device sends next data message, and it is 1 that output sends control request signal Req signal, and control subordinate logic produces message; So circulation.Because m is a random value, also be random value so send the time of its wait of control, also be random value at interval thereby send message.

Claims (1)

1. a kind of random frame interval control method of the present invention is characterized in that: may further comprise the steps:

The first step: calculate the frame period G between message, under the situation that does not comprise standard frame interval 12 bytes, computing formula is:

$G=(L+12+8)\×(\frac{R_1}{R}-1),$

Wherein:

The speed of the message that R-need send,

The L-message length,

A byte between the 12-standard frame,

8-lead code byte,

R ₁-port linear velocity, and R ₁＜R;

Second step: be sent completely the message of L byte when transmit control device after, latency counter loading scope from the M sequence generator is the random value m of 0～2G, and m ≠ 0, and begin to carry out the calculating of byte number time corresponding value, it is 0 that output simultaneously sends control request signal Req signal, and control subordinate logic stops message and produces;

The 3rd step: when latency counter counting reaches random value m, and m ≠ 0 o'clock, the notice transmit control device sends next data message, and it is 1 that output sends control request signal Req signal, and control subordinate logic produces message;

The 4th step: carry out the operation of second step.

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