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Variable bit rate service scheduling method based on gate control

A bit rate and service scheduling technology, applied in the field of communication, can solve the problems of lack of variable bit rate services, inability to adapt to the transmission requirements of variable bit rate service scenarios, and no way to solve the door control list, so as to achieve optimal delay jitter , Guarantee the effect of low-latency transmission and low-latency transmission

Active Publication Date: 2020-05-15
XIAN INSTITUE OF SPACE RADIO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) The published time-sensitive network standard (IEEE 802.1Qbv) proposes a gate control scheduling mechanism, but does not give a clear solution to the gate control list, that is, how to generate a gate control list to control the gate structure to complete time-sensitive services scheduling;
[0005] (2) In the existing research literature, only the gate control list in the application scenario of the same data packet in a single queue is studied; at the same time, the time-sensitive service queue studied is a constant bit-rate service with a fixed rate and a fixed period ( CBR), there is a lack of research on variable bit rate services (VBR) with different data frame lengths and different transmission periods
[0006] However, in space applications of time-sensitive network switching, time-sensitive services not only have constant bit-rate services, but also have bursty variable bit-rate services. The coexistence of the two time-sensitive services is critical to how to generate a gate control list for real-time performance and certainty. Moreover, the current time-sensitive service scheduling method cannot adapt to the transmission requirements of variable bit rate service scenarios, especially the real-time transmission requirements of different types of burst services in the space application environment

Method used

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  • Variable bit rate service scheduling method based on gate control
  • Variable bit rate service scheduling method based on gate control
  • Variable bit rate service scheduling method based on gate control

Examples

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Embodiment 1

[0051] Here, a time-sensitive network system applied to in-cabin communication of a spacecraft is taken as an example to illustrate a specific implementation manner of a variable bit rate service scheduling method based on gate control.

[0052] (1) Obtain service parameters, supported transmission service types include: fixed-rate CBR service, the rate level is 3, the rate is 1000Mbps, 100Mbps, 10Mbps, and the data frame length is 1000 bytes, 500 bytes, 100 byte;

[0053] (2) Determine the basic bandwidth unit. The basic bandwidth unit is the basic granularity quantified as a link capacity and CBR service flow rate as an integer. The selection of its value is the CBR service flow rate and link capacity flowing into the system (if the output link rate is R=1000Mbps) greatest common divisor v φ =10Mbps, the corresponding data length is L φ =(v φ / v c3 ) L c3 = 100 bytes;

[0054] (3) Determine the basic transmission window W tx , the basic transmission window is the mini...

Embodiment 2

[0071] A variable bit rate service scheduling method based on gate control, such as figure 2 shown, including the following steps:

[0072] S1. Obtain the rate value and frame length of the constant bit rate service.

[0073] S2. Determine the data length of the basic bandwidth unit according to the rate value and frame length of the constant bit rate service, the greatest common divisor of the flow rate of the constant bit rate service flowing into the system and the link capacity.

[0074] The data length L of the basic bandwidth unit φ for:

[0075] L φ =(v φ / v ci ) L ci , i∈(1,2,…,N)

[0076] In the formula, v φ is the greatest common divisor of the constant bit rate traffic flow rate and link capacity flowing into the system, v ci is the rate value of the constant bit rate service, L ci is the frame length of the constant bit rate service, i is the first serial number, and the maximum value of i is N.

[0077] S3. Determine the basic transmission window accor...

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Abstract

The invention discloses a variable bit rate service scheduling method based on gate control. The method comprises the steps that firstly, according to constant bit rate service characteristics, the link transmission time of the constant bit rate service is calculated; a basic transmission window is determined, and then the average rate of the variable bit rate service is obtained through statistical prediction within the basic transmission window time; the link transmission time corresponding to the variable bit rate service is further obtained; finally, the size of the basic transmission window is dynamically adjusted; the scheduling window time supporting the variable bit rate service is determined; and the gate control list simultaneously supporting the transmission of the constant bitrate service and the variable bit rate service is generated. The hybrid real-time scheduling and deterministic transmission of the two types of time sensitive services are realized, and the transmission delay of the time sensitive services is reduced.

Description

technical field [0001] The invention relates to a variable bit rate service scheduling method based on gate control, which belongs to the technical field of communication. Background technique [0002] Compared with traditional store-and-forward switching, time-sensitive network switching can provide real-time and deterministic transmission for time-sensitive service queues of different priorities when network switching and transmission resources are insufficient or even network congestion occurs. This service scheduling feature is realized through the gate control mechanism. The gate control includes multiple gate structures and a gate control list, such as figure 1 shown. The number of gates is equal to the number of queues in the device, and each queue is connected to a gate structure. The output and blocking operations of different queues are controlled by configuring the gate control list and changing the switch state of the gate structure, thereby ensuring low-latenc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/807H04L12/865H04L12/863H04L12/875H04L12/825H04L12/24H04L47/27H04L47/56H04L47/6275
CPCH04L47/27H04L47/6275H04L47/6215H04L47/56H04L47/25H04L41/147Y02D30/50
Inventor 崔涛周诠沈俊黎军张怡李静玲梁薇
Owner XIAN INSTITUE OF SPACE RADIO TECH
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