Data sending method and system based on time delay constraint

Abstract

The invention provides a data sending method and system based on time delay constraint, and the method comprises the following steps: dividing a sending queue into an eMAC priority queue and a pMAC priority queue, wherein the priority of the eMAC is higher than the priority of the pMAC; storing the plurality of pieces of to-be-sent data into corresponding priority queues according to priorities, calculating time required for sending the first to-be-sent data in the eMAC in an interference-free state, and recording the time as theoretical time delay; and when the execution parameter of the service primitive corresponding to the first to-be-sent data is kept, according to preset expected time delay, theoretical time delay and second to-be-sent data in the pMAC, calculating the preemption time for waiting for sending the first to-be-sent data, and sending the first to-be-sent data according to the preemption time. Under the condition that the time delay constraint condition of the high-priority frame is satisfied, the low-priority data has more transmission opportunities as much as possible, and the time delay is reduced, so that the overall performance of the system is improved, andthe relative fairness of service flow transmission is ensured.

Description

technical field [0001] The invention relates to the technical field of Ethernet communication, in particular to a data transmission method and system based on delay constraints. Background technique [0002] In the Ethernet network environment, each device connected to the network shares the transmission medium and is based on the technical characteristics of variable-length frames, which will cause the problem of uncertain transmission delay. For example, when delay-sensitive services such as voice and video are mixed with ordinary data services, there will be competition between the data of the two types of services. If the normal data service is given priority for transmission, the time-delay-sensitive service cannot be sent until all the normal data services are sent. In particular, when the common data service is a long frame, the frame jitter of the delay-sensitive service will be too large. On the other hand, with the advent of the 5G era, low-latency requirements f...

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Problems solved by technology

[0004] This method can significantly reduce the delay of delay-sensitive services, but it also has its disadvantages: First, when there are many fast frames in the system, the fast frames will frequently preempt ordinary frames, and the preemption overhead has a certain impact on system performance. impact, and even lead to significant performance degradation

Secondly, when a long ordinary frame is preempted by multiple fast frames, the ordinary frame may not be served for a long time and there will be a long wait, which cannot guarantee the relative fairness of data transmission, and even the system cannot An exception occurred while sending

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