Method for obtaining target transmission path and network node thereof

Abstract

The embodiment of the invention relates to a method for obtaining a target transmission path and a network node thereof. The method comprises the steps that the first network node in a network domain obtains topological information of multiple network nodes in each path between an entry node and an exit node in the network domain; the first network node obtains the transmission delay of each path according to the topological information, and the transmission delay of each path includes the sum of the physical link delay between all the network nodes in each path and node residence time of all the network nodes; and the first network node determines the target transmission path according to the transmission delay of each path. According to the method for obtaining the target transmission path and the network node thereof, transmission of low delay business in the network is ensured to meet the delay requirements, and multiple low delay paths between the entry node and the exit node in the network can be more fully utilized so as to enhance the transmission reliability of the low delay business.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and a network node for obtaining a target transmission path. Background technique [0002] Network protocol (Internet Protocol, referred to as IP) or multi-protocol label switching (Multi-Protocol Label Switching, referred to as MPLS) network generally needs to support low-latency traffic, for example: the low-latency requirements of mobile bearer traffic above the fourth generation (4G) , such as the X2 interface requires less than or equal to 10ms (defined by 3GPP), although the communication bandwidth of the X2 interface only accounts for 2-5% of the total bandwidth of the mobile communication, but its delay requirement is very high. Another example: Although the monitoring information and commands of the smart grid do not require high bandwidth, they will continue continuously and require low-latency and high-reliability transmission in the network, otherwise the gr...

AI Technical Summary

Problems solved by technology

[0003] Although the current IP or MPLS network has Quality of Service (QoS) technologies such as Differentiated Services (DiffServ for short), it can transmit traffic on the same path according to different QoS, or it can be based on QoS Different paths are used for transmission, but because it is essentially a packet multiplexing network, it is still unavoidable that high-priority packets will be queued or even blocked in the queue, causing the delay to exceed the threshold, and even in the In the worst case, packet loss occurs, and there is no guarantee that the end-to-end delay of the low-latency service stream during the actual forwarding process will not exceed a certain threshold

[0004] In the Internet Engineering Task Force (IETF for short), the intermediate system to intermediate system protocol (Intermediate System to Intermediate System, short for IS-IS), the shortest path first (Open Shortest Path First, short for OSPF) routing protocol has been Considering that the link delay is included in the routing measurement, none of them provide a specific link delay measurement mechanism. The disadvantage is that it is mainly applicable to the network environment where the transmission delay of the physical link is the main part. For the metropolitan area network or smaller The scope of the network is not very suitable for

[0005] In the industry, although the delay measurement technology of 1-way Delay or 2-way Delay of MPLS transmission mode (Transport Profile for MPLS, referred to as MPLS-TP) Operations, Administration, and Maintenance (referred to as OAM), However, the OAM mechanism is fixedly configured based on the MEP. It cannot be associated with a specific queue, nor can it measure the delay path of the entire network in a distributed manner, and its delay measurement has its own inherent defects. Queue, so the instantaneous length of the queue has an impact on the delay measurement; the link layer OAM cannot measure the node residence time

In addition, the main purpose is to measure the actual delay of the service, and the service-associated channel is used, which is inherently insufficient for obtaining the path delay a priori

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