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Exchange method based on cross-band time-triggered communication

A time-triggered, frequency-band technology, applied in the field of switched networks, can solve problems such as the inability to flexibly adjust forwarding and waiting delays due to scheduling requirements, and achieve the effect of enhancing time certainty and avoiding delay jitter

Active Publication Date: 2019-11-29
CHINESE AERONAUTICAL RADIO ELECTRONICS RES INST
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Problems solved by technology

[0006] The purpose of the present invention is to provide an exchange method based on time-triggered communication across frequency bands to realize the exchange and forwarding of time-triggered data between high frequency bands to low frequency bands, low frequency bands to high frequency bands, and between the same frequency bands, and exchange through static configuration The forwarding and waiting delay of the structure solves the problem that the cut-through switching structure cannot flexibly adjust the forwarding and waiting delay according to the scheduling requirements of time-triggered communication, and improves the time certainty of the network system

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  • Exchange method based on cross-band time-triggered communication
  • Exchange method based on cross-band time-triggered communication
  • Exchange method based on cross-band time-triggered communication

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Embodiment Construction

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0037] Step 1: Set the transmission frequency corresponding to each input port and output port of the switching structure, the forwarding delay wait_delay in the switching structure, and the number of time slices m allocated to the input port and output port to access the shared buffer area j . wait_delay is statically configured according to the network system communication needs, and it needs to satisfy wait_delay≥logic_delay min , logic_delay min It is the minimum time required for the first byte of a data frame to enter the switch fabric and the first byte of the data frame to leave the switch fabric for logical processing; each time-triggered TT flow has its definite time characteristic and output port. The time characteristics include the scheduling period, the start time point and the end time point of the receiving time window at the...

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Abstract

The invention discloses an exchange method based on cross-band time-triggered communication, which comprises the following steps: setting transmission frequencies corresponding to input ports and output ports of an exchange structure, and allocating the number of time slices for accessing a shared cache region to the input ports and the output ports; enabling the input port to receive the data frame in a receiving time window corresponding to the data frame, and write the data frame into the shared cache region on the distributed time slice; and enabling the output port to read the complete data frame from the shared cache region on the distributed time slice, and forward the data frame to the physical link in the sending time window, thereby completing the complete function of the switching structure from receiving to forwarding. According to the invention, exchange and forwarding of time-triggered data from a high frequency band to a low frequency band, from the low frequency band tothe high frequency band and between the same frequency bands are realized.

Description

technical field [0001] The present invention is applied to a switched network based on a time-triggered (TT) communication mechanism; in such a network, the present invention can realize TT data between high frequency band to low frequency band, low frequency band to high frequency band and the same frequency band The exchange and forwarding of the flow, and provide the deterministic delay of the switching structure through the static configuration of the forwarding delay, and improve the time determinism of the TT data flow. Background technique [0002] The basis of time-triggered communication lies in the local clock synchronization of distributed nodes. Unlike event-triggered communication, which randomly accesses the data stream transmission mode, TT communication has a strict time schedule, which triggers the transmission of data streams on time. TT communication can provide strict time determinism for safety-critical data flow in the system, and is applied in aerospac...

Claims

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Application Information

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IPC IPC(8): H04L12/863
CPCH04L47/625Y02D30/70
Inventor 孔韵雯罗泽雄袁泉谭永亮
Owner CHINESE AERONAUTICAL RADIO ELECTRONICS RES INST
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