Method and device for reducing time delay

Abstract

The invention discloses a method for reducing time delay. First, bandwidth information or available space length of first-in first-out cache are acquired. When the bandwidth information is smaller than a first preset value or the available space length of the first-in first-out cache is smaller than a second preset value, scheduling of received messages is stopped. The invention also discloses a device for reducing time delay.

Description

technical field [0001] The present invention relates to the field of optical communication networks, and in particular, to a method and device for reducing time delay. Background technique [0002] In a communication device, a bandwidth is usually preset for each user. When the amount of data transmitted by the user is greater than the preset bandwidth, in order to ensure quality of service (QoS, Quality of Service), it is necessary to transmit high-priority packets first, while low-priority packets will be delayed or discarded. Therefore, in order to ensure QoS, it is very important to reduce the delay of high-priority packets in network devices. [0003] In an optical network unit (ONU, Optical Network Unit), a first-in, first-out buffer for storing packets is usually set to reduce the overhead of media access control (MAC, Media Access Control) framing, and to meet the requirements of multi-mode line speed. When congestion occurs, as in figure 1 In the situation shown...

AI Technical Summary

Problems solved by technology

When congestion occurs, as in figure 1 In the situation shown, low-priority packets account for a large proportion and are stored in the position relative to the head of the queue in the first-in-first-out cache, while high-priority packets are stored in the relative tail position of the first-in-first-out cache , when the bandwidth is sufficient, the message will be read from the first-in-first-out buffer and sent to the optical line terminal (OLT, Optical Line Terminal); at this time, only after the low-priority message is sent out, the high-priority message can be sent or, if a higher-priority message is scheduled at this time, the higher-priority message can only be sent after all the messages stored in the first-in-first-out buffer are sent; or , delete the first-in-first-out cache, but in this case, the network will be idle again during the period between obtaining bandwidth information and completing scheduling, which will waste network resources; and for reducing the delay of high-priority packets no help either

It can be seen that these three situations will greatly affect QoS

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