System for access control of unidirectional light bus network based on priority level dynamic regulation

A network access control and dynamic adjustment technology, applied in the transmission system, electromagnetic wave transmission system, optical fiber transmission, etc., can solve the problems of not being able to make good use of optical bus resources and meet the real-time requirements of data transmission, so as to improve the real-time performance Requirements, the effect of improving the utilization rate of the optical bus

Active Publication Date: 2012-12-12
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0005] In order to solve the problem that the unidirectional optical bus access control strategy in the prior art cannot make good use of optical bus resources and cannot meet the real-time requirements of data transmission, the present invention proposes an access control that comprehensively considers the active node rate and delay requirements system to improve the activity of the optical bus and meet the real-time requirements, so that all nodes (users) on an optical bus can meet their respective information transmission delay requirements, and at the same time achieve the purpose of improving the utilization of the optical bus

Method used

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  • System for access control of unidirectional light bus network based on priority level dynamic regulation
  • System for access control of unidirectional light bus network based on priority level dynamic regulation
  • System for access control of unidirectional light bus network based on priority level dynamic regulation

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Embodiment 1

[0043] Reference figure 1 with figure 2 , A unidirectional optical bus network access control system based on priority dynamic adjustment, including a unidirectional optical bus containing M nodes, M≥3, and M is a natural number, the unidirectional optical bus includes a convening node, M-2 intermediate nodes and one termination node; the data flow of each node on the optical bus is a single service type. The one-way optical bus network access control system based on dynamic adjustment of priority also includes:

[0044] The node urgency parameter (J) calculation module is used to calculate whether the data at the node is eager to send. The data flow arriving at each node has a service maximum waiting delay T i , Where i represents different nodes on the optical bus, t i Indicates the delay that has been waited since the arrival of the first packet of the service; node urgency parameter J = t i T i Indicates the ratio of the waiting time to the total delay...

Embodiment 2

[0084] In this embodiment, the number of optical bus nodes M=6, and the other parameters are the same as in embodiment 1. The packet loss rate of the optical bus under different priority setting methods is evaluated, and the attachment is obtained. image 3 As shown in the results, the activity of the optical bus under different priority setting methods is evaluated, and the attached Figure 4 As shown in the results, it can be seen that the packet loss rate is the largest when the priority is fixed, and the active node rate is the smallest. When the priority setting emphasizes the delay requirement (ie a=0.95, b=0.05), the packet loss rate is the smallest, but the active node rate is small. When the priority setting focuses on the active node rate (ie a=0.05, b=0.95), the packet loss rate is larger, and more requests are lost due to time delay. When the priority setting considers both the delay and the active node rate (ie a=0.65, b=0.35), the packet loss rate is small, which i...

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Abstract

The invention discloses a system for access control of a unidirectional light bus network based on priority level dynamic regulation. The unidirectional light bus comprises a convening node, M-2 intermediate nodes and a termination node, wherein M is no less than 3 and is a natural number, and data stream of each node on the unidirectional light bus is in a single service type. The system for theaccess control of the unidirectional light bus network based on the priority level dynamic regulation comprises a node criticality parameter computing module, a movable node duty ratio computing module, a tag value computing module and a priority level judging module; and according to the priority level judging module, when a request reaches a node on the light bus, data is sequentially transmitted according to the priority level. The invention improves liveness of the light bus, meets real-time requirements, ensures that all the nodes (users) on same light bus meets information transmission delay requirements respectively, and simultaneously achieves the purpose of improving the use ratio of the light bus.

Description

Technical field [0001] The invention belongs to an access control system in the field of optical fiber communication networks, and is suitable for dynamically setting priorities for nodes in an optical bus network to meet the occasions where information has different time delay requirements. Background technique [0002] In recent years, with the explosive growth of data communication services, the types of services supported by the underlying optical communication network have also undergone great changes. From the original support for connection-oriented sound information to the current support for data information and bursts Mainly data information. In recent years, the rapid progress of optical fiber transmission technology, switching technology and optoelectronic device technology has made the transmission capacity of single optical fiber communication channel larger and higher, and the transmission rate has increased from the original single channel 2.5Gb / s to the current s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/12H04B10/25
Inventor 乐孜纯李声湘全必胜付明磊
Owner ZHEJIANG UNIV OF TECH
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