A data transmission method and system based on delay constraint

Abstract

The present invention provides a data transmission method and system based on delay constraints, the method comprises the following steps: dividing the transmission queue into two priority queues of eMAC and pMAC, the priority of eMAC is higher than that of pMAC; The data to be sent is stored in the corresponding priority queue according to the priority, and the time required to send the first data to be sent in the eMAC in the non-interference state is calculated, which is recorded as the theoretical delay; when the first data to be sent corresponds to When the execution parameter of the service primitive is hold, calculate the preemption time required to send the first data to be sent according to the preset expected delay, theoretical delay and the second data to be sent in pMAC, and send according to the preemption time The first data to be sent. The present invention realizes that under the condition of satisfying the time delay constraints of high priority frames, low priority data has more transmission opportunities as much as possible, reduces its time delay, thereby improving the overall performance of the system and ensuring the relative fairness of service flow transmission sex.

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 time delay constraints. Background technique [0002] In the Ethernet network environment, the devices accessing the network share the transmission medium and the technical characteristics based on variable-length frames 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, data competition between the two types of services will occur. If common data services are preferentially transmitted, delay-sensitive services cannot be sent until all common data services are sent. In particular, when the ordinary 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 for bearer access devices are essential....

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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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