Quality of service (QoS) maintaining method, device and system

Abstract

The invention discloses a Quality of service (QoS) maintaining method which comprises steps of identifying a CLP and a business type of a newly received ATM cell and obtaining the corresponding QoS mark, when the corresponding QoS mark of the newly received ATM cell is different from the corresponding QoS mark of a cached ATM cell, carrying out cascade packaging of the cached ATM cell into a pseudo linear PW message and sending the message, and with the corresponding QoS mark of the cached ATM cell as a QoS mark of a PSN transmission head of the PW message, or with the corresponding QoS mark of the cached ATM cell as the QoS mark of the PSN transmission head and a PW head of the PW message at the same time, caching the newly received ATM cell. The invention also provides the corresponding operator edge equipment PE and an ATM PWE3 system. According to the technical scheme of the invention, the priorities of all ATM cells contained in one PW message packaged in an ATM PWE3 cell in a cascaded way can be the same, and the more accurate service quality is provided.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method, device and system for maintaining quality of service (QoS). Background technique [0002] End-to-end pseudowire emulation (Pseudo Wire Emulation Edge to Edge, PWE3) refers to imitating Asynchronous Transfer Mode (Asynchronous Transfer Mode, ATM), Frame Relay, It is an end-to-end The end-to-end Layer 2 service bearer technology belongs to the point-to-point Layer 2 virtual private network (Layer2virtual private network, L2VPN). [0003] ATM PWE3 is a technology that carries ATM cells on the PWE3 virtual circuit. It uses the PSN network to connect the traditional ATM network, and provides ATM service simulation on the PSN network. When the traditional ATM network service passes through the PSN network, the maximum Simulate the original business, so that end users do not feel the difference, and protect the existing investment of users and operators in network int...

AI Technical Summary

Problems solved by technology

For this problem, RFC4717 suggests that the requirements of all ATM cells in a PW message be mapped to the highest priority of the QoS mark to be mapped to the QoS mark of the PSN transmission header or the PW header; this results in that the PW message The QoS level of other low-priority ATM cells is improved when they are transmitted in PSN, so that the encapsulated ATM cells do not fully emulate the original service when they are transmitted in PSN

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